?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
tree: convert read_tree_1 to use struct object_id internally
[git.git] / diff.c
blob3bd23ae4cda43125fc7f0da8fe5375aab0b94d35
1 /*
2 * Copyright (C) 2005 Junio C Hamano
3 */
4 #include "cache.h"
5 #include "tempfile.h"
6 #include "quote.h"
7 #include "diff.h"
8 #include "diffcore.h"
9 #include "delta.h"
10 #include "xdiff-interface.h"
11 #include "color.h"
12 #include "attr.h"
13 #include "run-command.h"
14 #include "utf8.h"
15 #include "userdiff.h"
16 #include "submodule-config.h"
17 #include "submodule.h"
18 #include "ll-merge.h"
19 #include "string-list.h"
20 #include "argv-array.h"
21 #include "graph.h"
22
23 #ifdef NO_FAST_WORKING_DIRECTORY
24 #define FAST_WORKING_DIRECTORY 0
25 #else
26 #define FAST_WORKING_DIRECTORY 1
27 #endif
28
29 static int diff_detect_rename_default;
30 static int diff_indent_heuristic; /* experimental */
31 static int diff_rename_limit_default = 400;
32 static int diff_suppress_blank_empty;
33 static int diff_use_color_default = -1;
34 static int diff_context_default = 3;
35 static int diff_interhunk_context_default;
36 static const char *diff_word_regex_cfg;
37 static const char *external_diff_cmd_cfg;
38 static const char *diff_order_file_cfg;
39 int diff_auto_refresh_index = 1;
40 static int diff_mnemonic_prefix;
41 static int diff_no_prefix;
42 static int diff_stat_graph_width;
43 static int diff_dirstat_permille_default = 30;
44 static struct diff_options default_diff_options;
45 static long diff_algorithm;
46 static unsigned ws_error_highlight_default = WSEH_NEW;
47
48 static char diff_colors[][COLOR_MAXLEN] = {
49 GIT_COLOR_RESET,
50 GIT_COLOR_NORMAL, /* CONTEXT */
51 GIT_COLOR_BOLD, /* METAINFO */
52 GIT_COLOR_CYAN, /* FRAGINFO */
53 GIT_COLOR_RED, /* OLD */
54 GIT_COLOR_GREEN, /* NEW */
55 GIT_COLOR_YELLOW, /* COMMIT */
56 GIT_COLOR_BG_RED, /* WHITESPACE */
57 GIT_COLOR_NORMAL, /* FUNCINFO */
58 };
59
60 static NORETURN void die_want_option(const char *option_name)
61 {
62 die(_("option '%s' requires a value"), option_name);
63 }
64
65 static int parse_diff_color_slot(const char *var)
66 {
67 if (!strcasecmp(var, "context") || !strcasecmp(var, "plain"))
68 return DIFF_CONTEXT;
69 if (!strcasecmp(var, "meta"))
70 return DIFF_METAINFO;
71 if (!strcasecmp(var, "frag"))
72 return DIFF_FRAGINFO;
73 if (!strcasecmp(var, "old"))
74 return DIFF_FILE_OLD;
75 if (!strcasecmp(var, "new"))
76 return DIFF_FILE_NEW;
77 if (!strcasecmp(var, "commit"))
78 return DIFF_COMMIT;
79 if (!strcasecmp(var, "whitespace"))
80 return DIFF_WHITESPACE;
81 if (!strcasecmp(var, "func"))
82 return DIFF_FUNCINFO;
83 return -1;
84 }
85
86 static int parse_dirstat_params(struct diff_options *options, const char *params_string,
87 struct strbuf *errmsg)
88 {
89 char *params_copy = xstrdup(params_string);
90 struct string_list params = STRING_LIST_INIT_NODUP;
91 int ret = 0;
92 int i;
93
94 if (*params_copy)
95 string_list_split_in_place(&params, params_copy, ',', -1);
96 for (i = 0; i < params.nr; i++) {
97 const char *p = params.items[i].string;
98 if (!strcmp(p, "changes")) {
99 DIFF_OPT_CLR(options, DIRSTAT_BY_LINE);
100 DIFF_OPT_CLR(options, DIRSTAT_BY_FILE);
101 } else if (!strcmp(p, "lines")) {
102 DIFF_OPT_SET(options, DIRSTAT_BY_LINE);
103 DIFF_OPT_CLR(options, DIRSTAT_BY_FILE);
104 } else if (!strcmp(p, "files")) {
105 DIFF_OPT_CLR(options, DIRSTAT_BY_LINE);
106 DIFF_OPT_SET(options, DIRSTAT_BY_FILE);
107 } else if (!strcmp(p, "noncumulative")) {
108 DIFF_OPT_CLR(options, DIRSTAT_CUMULATIVE);
109 } else if (!strcmp(p, "cumulative")) {
110 DIFF_OPT_SET(options, DIRSTAT_CUMULATIVE);
111 } else if (isdigit(*p)) {
112 char *end;
113 int permille = strtoul(p, &end, 10) * 10;
114 if (*end == '.' && isdigit(*++end)) {
115 /* only use first digit */
116 permille += *end - '0';
117 /* .. and ignore any further digits */
118 while (isdigit(*++end))
119 ; /* nothing */
120 }
121 if (!*end)
122 options->dirstat_permille = permille;
123 else {
124 strbuf_addf(errmsg, _(" Failed to parse dirstat cut-off percentage '%s'\n"),
125 p);
126 ret++;
127 }
128 } else {
129 strbuf_addf(errmsg, _(" Unknown dirstat parameter '%s'\n"), p);
130 ret++;
131 }
132
133 }
134 string_list_clear(&params, 0);
135 free(params_copy);
136 return ret;
137 }
138
139 static int parse_submodule_params(struct diff_options *options, const char *value)
140 {
141 if (!strcmp(value, "log"))
142 options->submodule_format = DIFF_SUBMODULE_LOG;
143 else if (!strcmp(value, "short"))
144 options->submodule_format = DIFF_SUBMODULE_SHORT;
145 else if (!strcmp(value, "diff"))
146 options->submodule_format = DIFF_SUBMODULE_INLINE_DIFF;
147 else
148 return -1;
149 return 0;
150 }
151
152 static int git_config_rename(const char *var, const char *value)
153 {
154 if (!value)
155 return DIFF_DETECT_RENAME;
156 if (!strcasecmp(value, "copies") || !strcasecmp(value, "copy"))
157 return DIFF_DETECT_COPY;
158 return git_config_bool(var,value) ? DIFF_DETECT_RENAME : 0;
159 }
160
161 long parse_algorithm_value(const char *value)
162 {
163 if (!value)
164 return -1;
165 else if (!strcasecmp(value, "myers") || !strcasecmp(value, "default"))
166 return 0;
167 else if (!strcasecmp(value, "minimal"))
168 return XDF_NEED_MINIMAL;
169 else if (!strcasecmp(value, "patience"))
170 return XDF_PATIENCE_DIFF;
171 else if (!strcasecmp(value, "histogram"))
172 return XDF_HISTOGRAM_DIFF;
173 return -1;
174 }
175
176 static int parse_one_token(const char **arg, const char *token)
177 {
178 const char *rest;
179 if (skip_prefix(*arg, token, &rest) && (!*rest || *rest == ',')) {
180 *arg = rest;
181 return 1;
182 }
183 return 0;
184 }
185
186 static int parse_ws_error_highlight(const char *arg)
187 {
188 const char *orig_arg = arg;
189 unsigned val = 0;
190
191 while (*arg) {
192 if (parse_one_token(&arg, "none"))
193 val = 0;
194 else if (parse_one_token(&arg, "default"))
195 val = WSEH_NEW;
196 else if (parse_one_token(&arg, "all"))
197 val = WSEH_NEW | WSEH_OLD | WSEH_CONTEXT;
198 else if (parse_one_token(&arg, "new"))
199 val |= WSEH_NEW;
200 else if (parse_one_token(&arg, "old"))
201 val |= WSEH_OLD;
202 else if (parse_one_token(&arg, "context"))
203 val |= WSEH_CONTEXT;
204 else {
205 return -1 - (int)(arg - orig_arg);
206 }
207 if (*arg)
208 arg++;
209 }
210 return val;
211 }
212
213 /*
214 * These are to give UI layer defaults.
215 * The core-level commands such as git-diff-files should
216 * never be affected by the setting of diff.renames
217 * the user happens to have in the configuration file.
218 */
219 void init_diff_ui_defaults(void)
220 {
221 diff_detect_rename_default = 1;
222 }
223
224 int git_diff_heuristic_config(const char *var, const char *value, void *cb)
225 {
226 if (!strcmp(var, "diff.indentheuristic"))
227 diff_indent_heuristic = git_config_bool(var, value);
228 return 0;
229 }
230
231 int git_diff_ui_config(const char *var, const char *value, void *cb)
232 {
233 if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
234 diff_use_color_default = git_config_colorbool(var, value);
235 return 0;
236 }
237 if (!strcmp(var, "diff.context")) {
238 diff_context_default = git_config_int(var, value);
239 if (diff_context_default < 0)
240 return -1;
241 return 0;
242 }
243 if (!strcmp(var, "diff.interhunkcontext")) {
244 diff_interhunk_context_default = git_config_int(var, value);
245 if (diff_interhunk_context_default < 0)
246 return -1;
247 return 0;
248 }
249 if (!strcmp(var, "diff.renames")) {
250 diff_detect_rename_default = git_config_rename(var, value);
251 return 0;
252 }
253 if (!strcmp(var, "diff.autorefreshindex")) {
254 diff_auto_refresh_index = git_config_bool(var, value);
255 return 0;
256 }
257 if (!strcmp(var, "diff.mnemonicprefix")) {
258 diff_mnemonic_prefix = git_config_bool(var, value);
259 return 0;
260 }
261 if (!strcmp(var, "diff.noprefix")) {
262 diff_no_prefix = git_config_bool(var, value);
263 return 0;
264 }
265 if (!strcmp(var, "diff.statgraphwidth")) {
266 diff_stat_graph_width = git_config_int(var, value);
267 return 0;
268 }
269 if (!strcmp(var, "diff.external"))
270 return git_config_string(&external_diff_cmd_cfg, var, value);
271 if (!strcmp(var, "diff.wordregex"))
272 return git_config_string(&diff_word_regex_cfg, var, value);
273 if (!strcmp(var, "diff.orderfile"))
274 return git_config_pathname(&diff_order_file_cfg, var, value);
275
276 if (!strcmp(var, "diff.ignoresubmodules"))
277 handle_ignore_submodules_arg(&default_diff_options, value);
278
279 if (!strcmp(var, "diff.submodule")) {
280 if (parse_submodule_params(&default_diff_options, value))
281 warning(_("Unknown value for 'diff.submodule' config variable: '%s'"),
282 value);
283 return 0;
284 }
285
286 if (!strcmp(var, "diff.algorithm")) {
287 diff_algorithm = parse_algorithm_value(value);
288 if (diff_algorithm < 0)
289 return -1;
290 return 0;
291 }
292
293 if (git_diff_heuristic_config(var, value, cb) < 0)
294 return -1;
295
296 if (!strcmp(var, "diff.wserrorhighlight")) {
297 int val = parse_ws_error_highlight(value);
298 if (val < 0)
299 return -1;
300 ws_error_highlight_default = val;
301 return 0;
302 }
303
304 if (git_color_config(var, value, cb) < 0)
305 return -1;
306
307 return git_diff_basic_config(var, value, cb);
308 }
309
310 int git_diff_basic_config(const char *var, const char *value, void *cb)
311 {
312 const char *name;
313
314 if (!strcmp(var, "diff.renamelimit")) {
315 diff_rename_limit_default = git_config_int(var, value);
316 return 0;
317 }
318
319 if (userdiff_config(var, value) < 0)
320 return -1;
321
322 if (skip_prefix(var, "diff.color.", &name) ||
323 skip_prefix(var, "color.diff.", &name)) {
324 int slot = parse_diff_color_slot(name);
325 if (slot < 0)
326 return 0;
327 if (!value)
328 return config_error_nonbool(var);
329 return color_parse(value, diff_colors[slot]);
330 }
331
332 /* like GNU diff's --suppress-blank-empty option */
333 if (!strcmp(var, "diff.suppressblankempty") ||
334 /* for backwards compatibility */
335 !strcmp(var, "diff.suppress-blank-empty")) {
336 diff_suppress_blank_empty = git_config_bool(var, value);
337 return 0;
338 }
339
340 if (!strcmp(var, "diff.dirstat")) {
341 struct strbuf errmsg = STRBUF_INIT;
342 default_diff_options.dirstat_permille = diff_dirstat_permille_default;
343 if (parse_dirstat_params(&default_diff_options, value, &errmsg))
344 warning(_("Found errors in 'diff.dirstat' config variable:\n%s"),
345 errmsg.buf);
346 strbuf_release(&errmsg);
347 diff_dirstat_permille_default = default_diff_options.dirstat_permille;
348 return 0;
349 }
350
351 if (starts_with(var, "submodule."))
352 return parse_submodule_config_option(var, value);
353
354 return git_default_config(var, value, cb);
355 }
356
357 static char *quote_two(const char *one, const char *two)
358 {
359 int need_one = quote_c_style(one, NULL, NULL, 1);
360 int need_two = quote_c_style(two, NULL, NULL, 1);
361 struct strbuf res = STRBUF_INIT;
362
363 if (need_one + need_two) {
364 strbuf_addch(&res, '"');
365 quote_c_style(one, &res, NULL, 1);
366 quote_c_style(two, &res, NULL, 1);
367 strbuf_addch(&res, '"');
368 } else {
369 strbuf_addstr(&res, one);
370 strbuf_addstr(&res, two);
371 }
372 return strbuf_detach(&res, NULL);
373 }
374
375 static const char *external_diff(void)
376 {
377 static const char *external_diff_cmd = NULL;
378 static int done_preparing = 0;
379
380 if (done_preparing)
381 return external_diff_cmd;
382 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
383 if (!external_diff_cmd)
384 external_diff_cmd = external_diff_cmd_cfg;
385 done_preparing = 1;
386 return external_diff_cmd;
387 }
388
389 /*
390 * Keep track of files used for diffing. Sometimes such an entry
391 * refers to a temporary file, sometimes to an existing file, and
392 * sometimes to "/dev/null".
393 */
394 static struct diff_tempfile {
395 /*
396 * filename external diff should read from, or NULL if this
397 * entry is currently not in use:
398 */
399 const char *name;
400
401 char hex[GIT_MAX_HEXSZ + 1];
402 char mode[10];
403
404 /*
405 * If this diff_tempfile instance refers to a temporary file,
406 * this tempfile object is used to manage its lifetime.
407 */
408 struct tempfile tempfile;
409 } diff_temp[2];
410
411 typedef unsigned long (*sane_truncate_fn)(char *line, unsigned long len);
412
413 struct emit_callback {
414 int color_diff;
415 unsigned ws_rule;
416 int blank_at_eof_in_preimage;
417 int blank_at_eof_in_postimage;
418 int lno_in_preimage;
419 int lno_in_postimage;
420 sane_truncate_fn truncate;
421 const char **label_path;
422 struct diff_words_data *diff_words;
423 struct diff_options *opt;
424 struct strbuf *header;
425 };
426
427 static int count_lines(const char *data, int size)
428 {
429 int count, ch, completely_empty = 1, nl_just_seen = 0;
430 count = 0;
431 while (0 < size--) {
432 ch = *data++;
433 if (ch == '\n') {
434 count++;
435 nl_just_seen = 1;
436 completely_empty = 0;
437 }
438 else {
439 nl_just_seen = 0;
440 completely_empty = 0;
441 }
442 }
443 if (completely_empty)
444 return 0;
445 if (!nl_just_seen)
446 count++; /* no trailing newline */
447 return count;
448 }
449
450 static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
451 {
452 if (!DIFF_FILE_VALID(one)) {
453 mf->ptr = (char *)""; /* does not matter */
454 mf->size = 0;
455 return 0;
456 }
457 else if (diff_populate_filespec(one, 0))
458 return -1;
459
460 mf->ptr = one->data;
461 mf->size = one->size;
462 return 0;
463 }
464
465 /* like fill_mmfile, but only for size, so we can avoid retrieving blob */
466 static unsigned long diff_filespec_size(struct diff_filespec *one)
467 {
468 if (!DIFF_FILE_VALID(one))
469 return 0;
470 diff_populate_filespec(one, CHECK_SIZE_ONLY);
471 return one->size;
472 }
473
474 static int count_trailing_blank(mmfile_t *mf, unsigned ws_rule)
475 {
476 char *ptr = mf->ptr;
477 long size = mf->size;
478 int cnt = 0;
479
480 if (!size)
481 return cnt;
482 ptr += size - 1; /* pointing at the very end */
483 if (*ptr != '\n')
484 ; /* incomplete line */
485 else
486 ptr--; /* skip the last LF */
487 while (mf->ptr < ptr) {
488 char *prev_eol;
489 for (prev_eol = ptr; mf->ptr <= prev_eol; prev_eol--)
490 if (*prev_eol == '\n')
491 break;
492 if (!ws_blank_line(prev_eol + 1, ptr - prev_eol, ws_rule))
493 break;
494 cnt++;
495 ptr = prev_eol - 1;
496 }
497 return cnt;
498 }
499
500 static void check_blank_at_eof(mmfile_t *mf1, mmfile_t *mf2,
501 struct emit_callback *ecbdata)
502 {
503 int l1, l2, at;
504 unsigned ws_rule = ecbdata->ws_rule;
505 l1 = count_trailing_blank(mf1, ws_rule);
506 l2 = count_trailing_blank(mf2, ws_rule);
507 if (l2 <= l1) {
508 ecbdata->blank_at_eof_in_preimage = 0;
509 ecbdata->blank_at_eof_in_postimage = 0;
510 return;
511 }
512 at = count_lines(mf1->ptr, mf1->size);
513 ecbdata->blank_at_eof_in_preimage = (at - l1) + 1;
514
515 at = count_lines(mf2->ptr, mf2->size);
516 ecbdata->blank_at_eof_in_postimage = (at - l2) + 1;
517 }
518
519 static void emit_line_0(struct diff_options *o, const char *set, const char *reset,
520 int first, const char *line, int len)
521 {
522 int has_trailing_newline, has_trailing_carriage_return;
523 int nofirst;
524 FILE *file = o->file;
525
526 fputs(diff_line_prefix(o), file);
527
528 if (len == 0) {
529 has_trailing_newline = (first == '\n');
530 has_trailing_carriage_return = (!has_trailing_newline &&
531 (first == '\r'));
532 nofirst = has_trailing_newline || has_trailing_carriage_return;
533 } else {
534 has_trailing_newline = (len > 0 && line[len-1] == '\n');
535 if (has_trailing_newline)
536 len--;
537 has_trailing_carriage_return = (len > 0 && line[len-1] == '\r');
538 if (has_trailing_carriage_return)
539 len--;
540 nofirst = 0;
541 }
542
543 if (len || !nofirst) {
544 fputs(set, file);
545 if (!nofirst)
546 fputc(first, file);
547 fwrite(line, len, 1, file);
548 fputs(reset, file);
549 }
550 if (has_trailing_carriage_return)
551 fputc('\r', file);
552 if (has_trailing_newline)
553 fputc('\n', file);
554 }
555
556 static void emit_line(struct diff_options *o, const char *set, const char *reset,
557 const char *line, int len)
558 {
559 emit_line_0(o, set, reset, line[0], line+1, len-1);
560 }
561
562 static int new_blank_line_at_eof(struct emit_callback *ecbdata, const char *line, int len)
563 {
564 if (!((ecbdata->ws_rule & WS_BLANK_AT_EOF) &&
565 ecbdata->blank_at_eof_in_preimage &&
566 ecbdata->blank_at_eof_in_postimage &&
567 ecbdata->blank_at_eof_in_preimage <= ecbdata->lno_in_preimage &&
568 ecbdata->blank_at_eof_in_postimage <= ecbdata->lno_in_postimage))
569 return 0;
570 return ws_blank_line(line, len, ecbdata->ws_rule);
571 }
572
573 static void emit_line_checked(const char *reset,
574 struct emit_callback *ecbdata,
575 const char *line, int len,
576 enum color_diff color,
577 unsigned ws_error_highlight,
578 char sign)
579 {
580 const char *set = diff_get_color(ecbdata->color_diff, color);
581 const char *ws = NULL;
582
583 if (ecbdata->opt->ws_error_highlight & ws_error_highlight) {
584 ws = diff_get_color(ecbdata->color_diff, DIFF_WHITESPACE);
585 if (!*ws)
586 ws = NULL;
587 }
588
589 if (!ws)
590 emit_line_0(ecbdata->opt, set, reset, sign, line, len);
591 else if (sign == '+' && new_blank_line_at_eof(ecbdata, line, len))
592 /* Blank line at EOF - paint '+' as well */
593 emit_line_0(ecbdata->opt, ws, reset, sign, line, len);
594 else {
595 /* Emit just the prefix, then the rest. */
596 emit_line_0(ecbdata->opt, set, reset, sign, "", 0);
597 ws_check_emit(line, len, ecbdata->ws_rule,
598 ecbdata->opt->file, set, reset, ws);
599 }
600 }
601
602 static void emit_add_line(const char *reset,
603 struct emit_callback *ecbdata,
604 const char *line, int len)
605 {
606 emit_line_checked(reset, ecbdata, line, len,
607 DIFF_FILE_NEW, WSEH_NEW, '+');
608 }
609
610 static void emit_del_line(const char *reset,
611 struct emit_callback *ecbdata,
612 const char *line, int len)
613 {
614 emit_line_checked(reset, ecbdata, line, len,
615 DIFF_FILE_OLD, WSEH_OLD, '-');
616 }
617
618 static void emit_context_line(const char *reset,
619 struct emit_callback *ecbdata,
620 const char *line, int len)
621 {
622 emit_line_checked(reset, ecbdata, line, len,
623 DIFF_CONTEXT, WSEH_CONTEXT, ' ');
624 }
625
626 static void emit_hunk_header(struct emit_callback *ecbdata,
627 const char *line, int len)
628 {
629 const char *context = diff_get_color(ecbdata->color_diff, DIFF_CONTEXT);
630 const char *frag = diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO);
631 const char *func = diff_get_color(ecbdata->color_diff, DIFF_FUNCINFO);
632 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
633 static const char atat[2] = { '@', '@' };
634 const char *cp, *ep;
635 struct strbuf msgbuf = STRBUF_INIT;
636 int org_len = len;
637 int i = 1;
638
639 /*
640 * As a hunk header must begin with "@@ -<old>, +<new> @@",
641 * it always is at least 10 bytes long.
642 */
643 if (len < 10 ||
644 memcmp(line, atat, 2) ||
645 !(ep = memmem(line + 2, len - 2, atat, 2))) {
646 emit_line(ecbdata->opt, context, reset, line, len);
647 return;
648 }
649 ep += 2; /* skip over @@ */
650
651 /* The hunk header in fraginfo color */
652 strbuf_addstr(&msgbuf, frag);
653 strbuf_add(&msgbuf, line, ep - line);
654 strbuf_addstr(&msgbuf, reset);
655
656 /*
657 * trailing "\r\n"
658 */
659 for ( ; i < 3; i++)
660 if (line[len - i] == '\r' || line[len - i] == '\n')
661 len--;
662
663 /* blank before the func header */
664 for (cp = ep; ep - line < len; ep++)
665 if (*ep != ' ' && *ep != '\t')
666 break;
667 if (ep != cp) {
668 strbuf_addstr(&msgbuf, context);
669 strbuf_add(&msgbuf, cp, ep - cp);
670 strbuf_addstr(&msgbuf, reset);
671 }
672
673 if (ep < line + len) {
674 strbuf_addstr(&msgbuf, func);
675 strbuf_add(&msgbuf, ep, line + len - ep);
676 strbuf_addstr(&msgbuf, reset);
677 }
678
679 strbuf_add(&msgbuf, line + len, org_len - len);
680 emit_line(ecbdata->opt, "", "", msgbuf.buf, msgbuf.len);
681 strbuf_release(&msgbuf);
682 }
683
684 static struct diff_tempfile *claim_diff_tempfile(void) {
685 int i;
686 for (i = 0; i < ARRAY_SIZE(diff_temp); i++)
687 if (!diff_temp[i].name)
688 return diff_temp + i;
689 die("BUG: diff is failing to clean up its tempfiles");
690 }
691
692 static void remove_tempfile(void)
693 {
694 int i;
695 for (i = 0; i < ARRAY_SIZE(diff_temp); i++) {
696 if (is_tempfile_active(&diff_temp[i].tempfile))
697 delete_tempfile(&diff_temp[i].tempfile);
698 diff_temp[i].name = NULL;
699 }
700 }
701
702 static void print_line_count(FILE *file, int count)
703 {
704 switch (count) {
705 case 0:
706 fprintf(file, "0,0");
707 break;
708 case 1:
709 fprintf(file, "1");
710 break;
711 default:
712 fprintf(file, "1,%d", count);
713 break;
714 }
715 }
716
717 static void emit_rewrite_lines(struct emit_callback *ecb,
718 int prefix, const char *data, int size)
719 {
720 const char *endp = NULL;
721 static const char *nneof = " No newline at end of file\n";
722 const char *reset = diff_get_color(ecb->color_diff, DIFF_RESET);
723
724 while (0 < size) {
725 int len;
726
727 endp = memchr(data, '\n', size);
728 len = endp ? (endp - data + 1) : size;
729 if (prefix != '+') {
730 ecb->lno_in_preimage++;
731 emit_del_line(reset, ecb, data, len);
732 } else {
733 ecb->lno_in_postimage++;
734 emit_add_line(reset, ecb, data, len);
735 }
736 size -= len;
737 data += len;
738 }
739 if (!endp) {
740 const char *context = diff_get_color(ecb->color_diff,
741 DIFF_CONTEXT);
742 putc('\n', ecb->opt->file);
743 emit_line_0(ecb->opt, context, reset, '\\',
744 nneof, strlen(nneof));
745 }
746 }
747
748 static void emit_rewrite_diff(const char *name_a,
749 const char *name_b,
750 struct diff_filespec *one,
751 struct diff_filespec *two,
752 struct userdiff_driver *textconv_one,
753 struct userdiff_driver *textconv_two,
754 struct diff_options *o)
755 {
756 int lc_a, lc_b;
757 const char *name_a_tab, *name_b_tab;
758 const char *metainfo = diff_get_color(o->use_color, DIFF_METAINFO);
759 const char *fraginfo = diff_get_color(o->use_color, DIFF_FRAGINFO);
760 const char *reset = diff_get_color(o->use_color, DIFF_RESET);
761 static struct strbuf a_name = STRBUF_INIT, b_name = STRBUF_INIT;
762 const char *a_prefix, *b_prefix;
763 char *data_one, *data_two;
764 size_t size_one, size_two;
765 struct emit_callback ecbdata;
766 const char *line_prefix = diff_line_prefix(o);
767
768 if (diff_mnemonic_prefix && DIFF_OPT_TST(o, REVERSE_DIFF)) {
769 a_prefix = o->b_prefix;
770 b_prefix = o->a_prefix;
771 } else {
772 a_prefix = o->a_prefix;
773 b_prefix = o->b_prefix;
774 }
775
776 name_a += (*name_a == '/');
777 name_b += (*name_b == '/');
778 name_a_tab = strchr(name_a, ' ') ? "\t" : "";
779 name_b_tab = strchr(name_b, ' ') ? "\t" : "";
780
781 strbuf_reset(&a_name);
782 strbuf_reset(&b_name);
783 quote_two_c_style(&a_name, a_prefix, name_a, 0);
784 quote_two_c_style(&b_name, b_prefix, name_b, 0);
785
786 size_one = fill_textconv(textconv_one, one, &data_one);
787 size_two = fill_textconv(textconv_two, two, &data_two);
788
789 memset(&ecbdata, 0, sizeof(ecbdata));
790 ecbdata.color_diff = want_color(o->use_color);
791 ecbdata.ws_rule = whitespace_rule(name_b);
792 ecbdata.opt = o;
793 if (ecbdata.ws_rule & WS_BLANK_AT_EOF) {
794 mmfile_t mf1, mf2;
795 mf1.ptr = (char *)data_one;
796 mf2.ptr = (char *)data_two;
797 mf1.size = size_one;
798 mf2.size = size_two;
799 check_blank_at_eof(&mf1, &mf2, &ecbdata);
800 }
801 ecbdata.lno_in_preimage = 1;
802 ecbdata.lno_in_postimage = 1;
803
804 lc_a = count_lines(data_one, size_one);
805 lc_b = count_lines(data_two, size_two);
806 fprintf(o->file,
807 "%s%s--- %s%s%s\n%s%s+++ %s%s%s\n%s%s@@ -",
808 line_prefix, metainfo, a_name.buf, name_a_tab, reset,
809 line_prefix, metainfo, b_name.buf, name_b_tab, reset,
810 line_prefix, fraginfo);
811 if (!o->irreversible_delete)
812 print_line_count(o->file, lc_a);
813 else
814 fprintf(o->file, "?,?");
815 fprintf(o->file, " +");
816 print_line_count(o->file, lc_b);
817 fprintf(o->file, " @@%s\n", reset);
818 if (lc_a && !o->irreversible_delete)
819 emit_rewrite_lines(&ecbdata, '-', data_one, size_one);
820 if (lc_b)
821 emit_rewrite_lines(&ecbdata, '+', data_two, size_two);
822 if (textconv_one)
823 free((char *)data_one);
824 if (textconv_two)
825 free((char *)data_two);
826 }
827
828 struct diff_words_buffer {
829 mmfile_t text;
830 long alloc;
831 struct diff_words_orig {
832 const char *begin, *end;
833 } *orig;
834 int orig_nr, orig_alloc;
835 };
836
837 static void diff_words_append(char *line, unsigned long len,
838 struct diff_words_buffer *buffer)
839 {
840 ALLOC_GROW(buffer->text.ptr, buffer->text.size + len, buffer->alloc);
841 line++;
842 len--;
843 memcpy(buffer->text.ptr + buffer->text.size, line, len);
844 buffer->text.size += len;
845 buffer->text.ptr[buffer->text.size] = '\0';
846 }
847
848 struct diff_words_style_elem {
849 const char *prefix;
850 const char *suffix;
851 const char *color; /* NULL; filled in by the setup code if
852 * color is enabled */
853 };
854
855 struct diff_words_style {
856 enum diff_words_type type;
857 struct diff_words_style_elem new, old, ctx;
858 const char *newline;
859 };
860
861 static struct diff_words_style diff_words_styles[] = {
862 { DIFF_WORDS_PORCELAIN, {"+", "\n"}, {"-", "\n"}, {" ", "\n"}, "~\n" },
863 { DIFF_WORDS_PLAIN, {"{+", "+}"}, {"[-", "-]"}, {"", ""}, "\n" },
864 { DIFF_WORDS_COLOR, {"", ""}, {"", ""}, {"", ""}, "\n" }
865 };
866
867 struct diff_words_data {
868 struct diff_words_buffer minus, plus;
869 const char *current_plus;
870 int last_minus;
871 struct diff_options *opt;
872 regex_t *word_regex;
873 enum diff_words_type type;
874 struct diff_words_style *style;
875 };
876
877 static int fn_out_diff_words_write_helper(FILE *fp,
878 struct diff_words_style_elem *st_el,
879 const char *newline,
880 size_t count, const char *buf,
881 const char *line_prefix)
882 {
883 int print = 0;
884
885 while (count) {
886 char *p = memchr(buf, '\n', count);
887 if (print)
888 fputs(line_prefix, fp);
889 if (p != buf) {
890 if (st_el->color && fputs(st_el->color, fp) < 0)
891 return -1;
892 if (fputs(st_el->prefix, fp) < 0 ||
893 fwrite(buf, p ? p - buf : count, 1, fp) != 1 ||
894 fputs(st_el->suffix, fp) < 0)
895 return -1;
896 if (st_el->color && *st_el->color
897 && fputs(GIT_COLOR_RESET, fp) < 0)
898 return -1;
899 }
900 if (!p)
901 return 0;
902 if (fputs(newline, fp) < 0)
903 return -1;
904 count -= p + 1 - buf;
905 buf = p + 1;
906 print = 1;
907 }
908 return 0;
909 }
910
911 /*
912 * '--color-words' algorithm can be described as:
913 *
914 * 1. collect a the minus/plus lines of a diff hunk, divided into
915 * minus-lines and plus-lines;
916 *
917 * 2. break both minus-lines and plus-lines into words and
918 * place them into two mmfile_t with one word for each line;
919 *
920 * 3. use xdiff to run diff on the two mmfile_t to get the words level diff;
921 *
922 * And for the common parts of the both file, we output the plus side text.
923 * diff_words->current_plus is used to trace the current position of the plus file
924 * which printed. diff_words->last_minus is used to trace the last minus word
925 * printed.
926 *
927 * For '--graph' to work with '--color-words', we need to output the graph prefix
928 * on each line of color words output. Generally, there are two conditions on
929 * which we should output the prefix.
930 *
931 * 1. diff_words->last_minus == 0 &&
932 * diff_words->current_plus == diff_words->plus.text.ptr
933 *
934 * that is: the plus text must start as a new line, and if there is no minus
935 * word printed, a graph prefix must be printed.
936 *
937 * 2. diff_words->current_plus > diff_words->plus.text.ptr &&
938 * *(diff_words->current_plus - 1) == '\n'
939 *
940 * that is: a graph prefix must be printed following a '\n'
941 */
942 static int color_words_output_graph_prefix(struct diff_words_data *diff_words)
943 {
944 if ((diff_words->last_minus == 0 &&
945 diff_words->current_plus == diff_words->plus.text.ptr) ||
946 (diff_words->current_plus > diff_words->plus.text.ptr &&
947 *(diff_words->current_plus - 1) == '\n')) {
948 return 1;
949 } else {
950 return 0;
951 }
952 }
953
954 static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
955 {
956 struct diff_words_data *diff_words = priv;
957 struct diff_words_style *style = diff_words->style;
958 int minus_first, minus_len, plus_first, plus_len;
959 const char *minus_begin, *minus_end, *plus_begin, *plus_end;
960 struct diff_options *opt = diff_words->opt;
961 const char *line_prefix;
962
963 if (line[0] != '@' || parse_hunk_header(line, len,
964 &minus_first, &minus_len, &plus_first, &plus_len))
965 return;
966
967 assert(opt);
968 line_prefix = diff_line_prefix(opt);
969
970 /* POSIX requires that first be decremented by one if len == 0... */
971 if (minus_len) {
972 minus_begin = diff_words->minus.orig[minus_first].begin;
973 minus_end =
974 diff_words->minus.orig[minus_first + minus_len - 1].end;
975 } else
976 minus_begin = minus_end =
977 diff_words->minus.orig[minus_first].end;
978
979 if (plus_len) {
980 plus_begin = diff_words->plus.orig[plus_first].begin;
981 plus_end = diff_words->plus.orig[plus_first + plus_len - 1].end;
982 } else
983 plus_begin = plus_end = diff_words->plus.orig[plus_first].end;
984
985 if (color_words_output_graph_prefix(diff_words)) {
986 fputs(line_prefix, diff_words->opt->file);
987 }
988 if (diff_words->current_plus != plus_begin) {
989 fn_out_diff_words_write_helper(diff_words->opt->file,
990 &style->ctx, style->newline,
991 plus_begin - diff_words->current_plus,
992 diff_words->current_plus, line_prefix);
993 if (*(plus_begin - 1) == '\n')
994 fputs(line_prefix, diff_words->opt->file);
995 }
996 if (minus_begin != minus_end) {
997 fn_out_diff_words_write_helper(diff_words->opt->file,
998 &style->old, style->newline,
999 minus_end - minus_begin, minus_begin,
1000 line_prefix);
1001 }
1002 if (plus_begin != plus_end) {
1003 fn_out_diff_words_write_helper(diff_words->opt->file,
1004 &style->new, style->newline,
1005 plus_end - plus_begin, plus_begin,
1006 line_prefix);
1007 }
1008
1009 diff_words->current_plus = plus_end;
1010 diff_words->last_minus = minus_first;
1011 }
1012
1013 /* This function starts looking at *begin, and returns 0 iff a word was found. */
1014 static int find_word_boundaries(mmfile_t *buffer, regex_t *word_regex,
1015 int *begin, int *end)
1016 {
1017 if (word_regex && *begin < buffer->size) {
1018 regmatch_t match[1];
1019 if (!regexec_buf(word_regex, buffer->ptr + *begin,
1020 buffer->size - *begin, 1, match, 0)) {
1021 char *p = memchr(buffer->ptr + *begin + match[0].rm_so,
1022 '\n', match[0].rm_eo - match[0].rm_so);
1023 *end = p ? p - buffer->ptr : match[0].rm_eo + *begin;
1024 *begin += match[0].rm_so;
1025 return *begin >= *end;
1026 }
1027 return -1;
1028 }
1029
1030 /* find the next word */
1031 while (*begin < buffer->size && isspace(buffer->ptr[*begin]))
1032 (*begin)++;
1033 if (*begin >= buffer->size)
1034 return -1;
1035
1036 /* find the end of the word */
1037 *end = *begin + 1;
1038 while (*end < buffer->size && !isspace(buffer->ptr[*end]))
1039 (*end)++;
1040
1041 return 0;
1042 }
1043
1044 /*
1045 * This function splits the words in buffer->text, stores the list with
1046 * newline separator into out, and saves the offsets of the original words
1047 * in buffer->orig.
1048 */
1049 static void diff_words_fill(struct diff_words_buffer *buffer, mmfile_t *out,
1050 regex_t *word_regex)
1051 {
1052 int i, j;
1053 long alloc = 0;
1054
1055 out->size = 0;
1056 out->ptr = NULL;
1057
1058 /* fake an empty "0th" word */
1059 ALLOC_GROW(buffer->orig, 1, buffer->orig_alloc);
1060 buffer->orig[0].begin = buffer->orig[0].end = buffer->text.ptr;
1061 buffer->orig_nr = 1;
1062
1063 for (i = 0; i < buffer->text.size; i++) {
1064 if (find_word_boundaries(&buffer->text, word_regex, &i, &j))
1065 return;
1066
1067 /* store original boundaries */
1068 ALLOC_GROW(buffer->orig, buffer->orig_nr + 1,
1069 buffer->orig_alloc);
1070 buffer->orig[buffer->orig_nr].begin = buffer->text.ptr + i;
1071 buffer->orig[buffer->orig_nr].end = buffer->text.ptr + j;
1072 buffer->orig_nr++;
1073
1074 /* store one word */
1075 ALLOC_GROW(out->ptr, out->size + j - i + 1, alloc);
1076 memcpy(out->ptr + out->size, buffer->text.ptr + i, j - i);
1077 out->ptr[out->size + j - i] = '\n';
1078 out->size += j - i + 1;
1079
1080 i = j - 1;
1081 }
1082 }
1083
1084 /* this executes the word diff on the accumulated buffers */
1085 static void diff_words_show(struct diff_words_data *diff_words)
1086 {
1087 xpparam_t xpp;
1088 xdemitconf_t xecfg;
1089 mmfile_t minus, plus;
1090 struct diff_words_style *style = diff_words->style;
1091
1092 struct diff_options *opt = diff_words->opt;
1093 const char *line_prefix;
1094
1095 assert(opt);
1096 line_prefix = diff_line_prefix(opt);
1097
1098 /* special case: only removal */
1099 if (!diff_words->plus.text.size) {
1100 fputs(line_prefix, diff_words->opt->file);
1101 fn_out_diff_words_write_helper(diff_words->opt->file,
1102 &style->old, style->newline,
1103 diff_words->minus.text.size,
1104 diff_words->minus.text.ptr, line_prefix);
1105 diff_words->minus.text.size = 0;
1106 return;
1107 }
1108
1109 diff_words->current_plus = diff_words->plus.text.ptr;
1110 diff_words->last_minus = 0;
1111
1112 memset(&xpp, 0, sizeof(xpp));
1113 memset(&xecfg, 0, sizeof(xecfg));
1114 diff_words_fill(&diff_words->minus, &minus, diff_words->word_regex);
1115 diff_words_fill(&diff_words->plus, &plus, diff_words->word_regex);
1116 xpp.flags = 0;
1117 /* as only the hunk header will be parsed, we need a 0-context */
1118 xecfg.ctxlen = 0;
1119 if (xdi_diff_outf(&minus, &plus, fn_out_diff_words_aux, diff_words,
1120 &xpp, &xecfg))
1121 die("unable to generate word diff");
1122 free(minus.ptr);
1123 free(plus.ptr);
1124 if (diff_words->current_plus != diff_words->plus.text.ptr +
1125 diff_words->plus.text.size) {
1126 if (color_words_output_graph_prefix(diff_words))
1127 fputs(line_prefix, diff_words->opt->file);
1128 fn_out_diff_words_write_helper(diff_words->opt->file,
1129 &style->ctx, style->newline,
1130 diff_words->plus.text.ptr + diff_words->plus.text.size
1131 - diff_words->current_plus, diff_words->current_plus,
1132 line_prefix);
1133 }
1134 diff_words->minus.text.size = diff_words->plus.text.size = 0;
1135 }
1136
1137 /* In "color-words" mode, show word-diff of words accumulated in the buffer */
1138 static void diff_words_flush(struct emit_callback *ecbdata)
1139 {
1140 if (ecbdata->diff_words->minus.text.size ||
1141 ecbdata->diff_words->plus.text.size)
1142 diff_words_show(ecbdata->diff_words);
1143 }
1144
1145 static void diff_filespec_load_driver(struct diff_filespec *one)
1146 {
1147 /* Use already-loaded driver */
1148 if (one->driver)
1149 return;
1150
1151 if (S_ISREG(one->mode))
1152 one->driver = userdiff_find_by_path(one->path);
1153
1154 /* Fallback to default settings */
1155 if (!one->driver)
1156 one->driver = userdiff_find_by_name("default");
1157 }
1158
1159 static const char *userdiff_word_regex(struct diff_filespec *one)
1160 {
1161 diff_filespec_load_driver(one);
1162 return one->driver->word_regex;
1163 }
1164
1165 static void init_diff_words_data(struct emit_callback *ecbdata,
1166 struct diff_options *orig_opts,
1167 struct diff_filespec *one,
1168 struct diff_filespec *two)
1169 {
1170 int i;
1171 struct diff_options *o = xmalloc(sizeof(struct diff_options));
1172 memcpy(o, orig_opts, sizeof(struct diff_options));
1173
1174 ecbdata->diff_words =
1175 xcalloc(1, sizeof(struct diff_words_data));
1176 ecbdata->diff_words->type = o->word_diff;
1177 ecbdata->diff_words->opt = o;
1178 if (!o->word_regex)
1179 o->word_regex = userdiff_word_regex(one);
1180 if (!o->word_regex)
1181 o->word_regex = userdiff_word_regex(two);
1182 if (!o->word_regex)
1183 o->word_regex = diff_word_regex_cfg;
1184 if (o->word_regex) {
1185 ecbdata->diff_words->word_regex = (regex_t *)
1186 xmalloc(sizeof(regex_t));
1187 if (regcomp(ecbdata->diff_words->word_regex,
1188 o->word_regex,
1189 REG_EXTENDED | REG_NEWLINE))
1190 die ("Invalid regular expression: %s",
1191 o->word_regex);
1192 }
1193 for (i = 0; i < ARRAY_SIZE(diff_words_styles); i++) {
1194 if (o->word_diff == diff_words_styles[i].type) {
1195 ecbdata->diff_words->style =
1196 &diff_words_styles[i];
1197 break;
1198 }
1199 }
1200 if (want_color(o->use_color)) {
1201 struct diff_words_style *st = ecbdata->diff_words->style;
1202 st->old.color = diff_get_color_opt(o, DIFF_FILE_OLD);
1203 st->new.color = diff_get_color_opt(o, DIFF_FILE_NEW);
1204 st->ctx.color = diff_get_color_opt(o, DIFF_CONTEXT);
1205 }
1206 }
1207
1208 static void free_diff_words_data(struct emit_callback *ecbdata)
1209 {
1210 if (ecbdata->diff_words) {
1211 diff_words_flush(ecbdata);
1212 free (ecbdata->diff_words->opt);
1213 free (ecbdata->diff_words->minus.text.ptr);
1214 free (ecbdata->diff_words->minus.orig);
1215 free (ecbdata->diff_words->plus.text.ptr);
1216 free (ecbdata->diff_words->plus.orig);
1217 if (ecbdata->diff_words->word_regex) {
1218 regfree(ecbdata->diff_words->word_regex);
1219 free(ecbdata->diff_words->word_regex);
1220 }
1221 free(ecbdata->diff_words);
1222 ecbdata->diff_words = NULL;
1223 }
1224 }
1225
1226 const char *diff_get_color(int diff_use_color, enum color_diff ix)
1227 {
1228 if (want_color(diff_use_color))
1229 return diff_colors[ix];
1230 return "";
1231 }
1232
1233 const char *diff_line_prefix(struct diff_options *opt)
1234 {
1235 struct strbuf *msgbuf;
1236 if (!opt->output_prefix)
1237 return "";
1238
1239 msgbuf = opt->output_prefix(opt, opt->output_prefix_data);
1240 return msgbuf->buf;
1241 }
1242
1243 static unsigned long sane_truncate_line(struct emit_callback *ecb, char *line, unsigned long len)
1244 {
1245 const char *cp;
1246 unsigned long allot;
1247 size_t l = len;
1248
1249 if (ecb->truncate)
1250 return ecb->truncate(line, len);
1251 cp = line;
1252 allot = l;
1253 while (0 < l) {
1254 (void) utf8_width(&cp, &l);
1255 if (!cp)
1256 break; /* truncated in the middle? */
1257 }
1258 return allot - l;
1259 }
1260
1261 static void find_lno(const char *line, struct emit_callback *ecbdata)
1262 {
1263 const char *p;
1264 ecbdata->lno_in_preimage = 0;
1265 ecbdata->lno_in_postimage = 0;
1266 p = strchr(line, '-');
1267 if (!p)
1268 return; /* cannot happen */
1269 ecbdata->lno_in_preimage = strtol(p + 1, NULL, 10);
1270 p = strchr(p, '+');
1271 if (!p)
1272 return; /* cannot happen */
1273 ecbdata->lno_in_postimage = strtol(p + 1, NULL, 10);
1274 }
1275
1276 static void fn_out_consume(void *priv, char *line, unsigned long len)
1277 {
1278 struct emit_callback *ecbdata = priv;
1279 const char *meta = diff_get_color(ecbdata->color_diff, DIFF_METAINFO);
1280 const char *context = diff_get_color(ecbdata->color_diff, DIFF_CONTEXT);
1281 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
1282 struct diff_options *o = ecbdata->opt;
1283 const char *line_prefix = diff_line_prefix(o);
1284
1285 o->found_changes = 1;
1286
1287 if (ecbdata->header) {
1288 fprintf(o->file, "%s", ecbdata->header->buf);
1289 strbuf_reset(ecbdata->header);
1290 ecbdata->header = NULL;
1291 }
1292
1293 if (ecbdata->label_path[0]) {
1294 const char *name_a_tab, *name_b_tab;
1295
1296 name_a_tab = strchr(ecbdata->label_path[0], ' ') ? "\t" : "";
1297 name_b_tab = strchr(ecbdata->label_path[1], ' ') ? "\t" : "";
1298
1299 fprintf(o->file, "%s%s--- %s%s%s\n",
1300 line_prefix, meta, ecbdata->label_path[0], reset, name_a_tab);
1301 fprintf(o->file, "%s%s+++ %s%s%s\n",
1302 line_prefix, meta, ecbdata->label_path[1], reset, name_b_tab);
1303 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
1304 }
1305
1306 if (diff_suppress_blank_empty
1307 && len == 2 && line[0] == ' ' && line[1] == '\n') {
1308 line[0] = '\n';
1309 len = 1;
1310 }
1311
1312 if (line[0] == '@') {
1313 if (ecbdata->diff_words)
1314 diff_words_flush(ecbdata);
1315 len = sane_truncate_line(ecbdata, line, len);
1316 find_lno(line, ecbdata);
1317 emit_hunk_header(ecbdata, line, len);
1318 if (line[len-1] != '\n')
1319 putc('\n', o->file);
1320 return;
1321 }
1322
1323 if (ecbdata->diff_words) {
1324 if (line[0] == '-') {
1325 diff_words_append(line, len,
1326 &ecbdata->diff_words->minus);
1327 return;
1328 } else if (line[0] == '+') {
1329 diff_words_append(line, len,
1330 &ecbdata->diff_words->plus);
1331 return;
1332 } else if (starts_with(line, "\\ ")) {
1333 /*
1334 * Eat the "no newline at eof" marker as if we
1335 * saw a "+" or "-" line with nothing on it,
1336 * and return without diff_words_flush() to
1337 * defer processing. If this is the end of
1338 * preimage, more "+" lines may come after it.
1339 */
1340 return;
1341 }
1342 diff_words_flush(ecbdata);
1343 if (ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN) {
1344 emit_line(o, context, reset, line, len);
1345 fputs("~\n", o->file);
1346 } else {
1347 /*
1348 * Skip the prefix character, if any. With
1349 * diff_suppress_blank_empty, there may be
1350 * none.
1351 */
1352 if (line[0] != '\n') {
1353 line++;
1354 len--;
1355 }
1356 emit_line(o, context, reset, line, len);
1357 }
1358 return;
1359 }
1360
1361 switch (line[0]) {
1362 case '+':
1363 ecbdata->lno_in_postimage++;
1364 emit_add_line(reset, ecbdata, line + 1, len - 1);
1365 break;
1366 case '-':
1367 ecbdata->lno_in_preimage++;
1368 emit_del_line(reset, ecbdata, line + 1, len - 1);
1369 break;
1370 case ' ':
1371 ecbdata->lno_in_postimage++;
1372 ecbdata->lno_in_preimage++;
1373 emit_context_line(reset, ecbdata, line + 1, len - 1);
1374 break;
1375 default:
1376 /* incomplete line at the end */
1377 ecbdata->lno_in_preimage++;
1378 emit_line(o, diff_get_color(ecbdata->color_diff, DIFF_CONTEXT),
1379 reset, line, len);
1380 break;
1381 }
1382 }
1383
1384 static char *pprint_rename(const char *a, const char *b)
1385 {
1386 const char *old = a;
1387 const char *new = b;
1388 struct strbuf name = STRBUF_INIT;
1389 int pfx_length, sfx_length;
1390 int pfx_adjust_for_slash;
1391 int len_a = strlen(a);
1392 int len_b = strlen(b);
1393 int a_midlen, b_midlen;
1394 int qlen_a = quote_c_style(a, NULL, NULL, 0);
1395 int qlen_b = quote_c_style(b, NULL, NULL, 0);
1396
1397 if (qlen_a || qlen_b) {
1398 quote_c_style(a, &name, NULL, 0);
1399 strbuf_addstr(&name, " => ");
1400 quote_c_style(b, &name, NULL, 0);
1401 return strbuf_detach(&name, NULL);
1402 }
1403
1404 /* Find common prefix */
1405 pfx_length = 0;
1406 while (*old && *new && *old == *new) {
1407 if (*old == '/')
1408 pfx_length = old - a + 1;
1409 old++;
1410 new++;
1411 }
1412
1413 /* Find common suffix */
1414 old = a + len_a;
1415 new = b + len_b;
1416 sfx_length = 0;
1417 /*
1418 * If there is a common prefix, it must end in a slash. In
1419 * that case we let this loop run 1 into the prefix to see the
1420 * same slash.
1421 *
1422 * If there is no common prefix, we cannot do this as it would
1423 * underrun the input strings.
1424 */
1425 pfx_adjust_for_slash = (pfx_length ? 1 : 0);
1426 while (a + pfx_length - pfx_adjust_for_slash <= old &&
1427 b + pfx_length - pfx_adjust_for_slash <= new &&
1428 *old == *new) {
1429 if (*old == '/')
1430 sfx_length = len_a - (old - a);
1431 old--;
1432 new--;
1433 }
1434
1435 /*
1436 * pfx{mid-a => mid-b}sfx
1437 * {pfx-a => pfx-b}sfx
1438 * pfx{sfx-a => sfx-b}
1439 * name-a => name-b
1440 */
1441 a_midlen = len_a - pfx_length - sfx_length;
1442 b_midlen = len_b - pfx_length - sfx_length;
1443 if (a_midlen < 0)
1444 a_midlen = 0;
1445 if (b_midlen < 0)
1446 b_midlen = 0;
1447
1448 strbuf_grow(&name, pfx_length + a_midlen + b_midlen + sfx_length + 7);
1449 if (pfx_length + sfx_length) {
1450 strbuf_add(&name, a, pfx_length);
1451 strbuf_addch(&name, '{');
1452 }
1453 strbuf_add(&name, a + pfx_length, a_midlen);
1454 strbuf_addstr(&name, " => ");
1455 strbuf_add(&name, b + pfx_length, b_midlen);
1456 if (pfx_length + sfx_length) {
1457 strbuf_addch(&name, '}');
1458 strbuf_add(&name, a + len_a - sfx_length, sfx_length);
1459 }
1460 return strbuf_detach(&name, NULL);
1461 }
1462
1463 struct diffstat_t {
1464 int nr;
1465 int alloc;
1466 struct diffstat_file {
1467 char *from_name;
1468 char *name;
1469 char *print_name;
1470 unsigned is_unmerged:1;
1471 unsigned is_binary:1;
1472 unsigned is_renamed:1;
1473 unsigned is_interesting:1;
1474 uintmax_t added, deleted;
1475 } **files;
1476 };
1477
1478 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
1479 const char *name_a,
1480 const char *name_b)
1481 {
1482 struct diffstat_file *x;
1483 x = xcalloc(1, sizeof(*x));
1484 ALLOC_GROW(diffstat->files, diffstat->nr + 1, diffstat->alloc);
1485 diffstat->files[diffstat->nr++] = x;
1486 if (name_b) {
1487 x->from_name = xstrdup(name_a);
1488 x->name = xstrdup(name_b);
1489 x->is_renamed = 1;
1490 }
1491 else {
1492 x->from_name = NULL;
1493 x->name = xstrdup(name_a);
1494 }
1495 return x;
1496 }
1497
1498 static void diffstat_consume(void *priv, char *line, unsigned long len)
1499 {
1500 struct diffstat_t *diffstat = priv;
1501 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
1502
1503 if (line[0] == '+')
1504 x->added++;
1505 else if (line[0] == '-')
1506 x->deleted++;
1507 }
1508
1509 const char mime_boundary_leader[] = "------------";
1510
1511 static int scale_linear(int it, int width, int max_change)
1512 {
1513 if (!it)
1514 return 0;
1515 /*
1516 * make sure that at least one '-' or '+' is printed if
1517 * there is any change to this path. The easiest way is to
1518 * scale linearly as if the alloted width is one column shorter
1519 * than it is, and then add 1 to the result.
1520 */
1521 return 1 + (it * (width - 1) / max_change);
1522 }
1523
1524 static void show_name(FILE *file,
1525 const char *prefix, const char *name, int len)
1526 {
1527 fprintf(file, " %s%-*s |", prefix, len, name);
1528 }
1529
1530 static void show_graph(FILE *file, char ch, int cnt, const char *set, const char *reset)
1531 {
1532 if (cnt <= 0)
1533 return;
1534 fprintf(file, "%s", set);
1535 while (cnt--)
1536 putc(ch, file);
1537 fprintf(file, "%s", reset);
1538 }
1539
1540 static void fill_print_name(struct diffstat_file *file)
1541 {
1542 char *pname;
1543
1544 if (file->print_name)
1545 return;
1546
1547 if (!file->is_renamed) {
1548 struct strbuf buf = STRBUF_INIT;
1549 if (quote_c_style(file->name, &buf, NULL, 0)) {
1550 pname = strbuf_detach(&buf, NULL);
1551 } else {
1552 pname = file->name;
1553 strbuf_release(&buf);
1554 }
1555 } else {
1556 pname = pprint_rename(file->from_name, file->name);
1557 }
1558 file->print_name = pname;
1559 }
1560
1561 int print_stat_summary(FILE *fp, int files, int insertions, int deletions)
1562 {
1563 struct strbuf sb = STRBUF_INIT;
1564 int ret;
1565
1566 if (!files) {
1567 assert(insertions == 0 && deletions == 0);
1568 return fprintf(fp, "%s\n", " 0 files changed");
1569 }
1570
1571 strbuf_addf(&sb,
1572 (files == 1) ? " %d file changed" : " %d files changed",
1573 files);
1574
1575 /*
1576 * For binary diff, the caller may want to print "x files
1577 * changed" with insertions == 0 && deletions == 0.
1578 *
1579 * Not omitting "0 insertions(+), 0 deletions(-)" in this case
1580 * is probably less confusing (i.e skip over "2 files changed
1581 * but nothing about added/removed lines? Is this a bug in Git?").
1582 */
1583 if (insertions || deletions == 0) {
1584 strbuf_addf(&sb,
1585 (insertions == 1) ? ", %d insertion(+)" : ", %d insertions(+)",
1586 insertions);
1587 }
1588
1589 if (deletions || insertions == 0) {
1590 strbuf_addf(&sb,
1591 (deletions == 1) ? ", %d deletion(-)" : ", %d deletions(-)",
1592 deletions);
1593 }
1594 strbuf_addch(&sb, '\n');
1595 ret = fputs(sb.buf, fp);
1596 strbuf_release(&sb);
1597 return ret;
1598 }
1599
1600 static void show_stats(struct diffstat_t *data, struct diff_options *options)
1601 {
1602 int i, len, add, del, adds = 0, dels = 0;
1603 uintmax_t max_change = 0, max_len = 0;
1604 int total_files = data->nr, count;
1605 int width, name_width, graph_width, number_width = 0, bin_width = 0;
1606 const char *reset, *add_c, *del_c;
1607 const char *line_prefix = "";
1608 int extra_shown = 0;
1609
1610 if (data->nr == 0)
1611 return;
1612
1613 line_prefix = diff_line_prefix(options);
1614 count = options->stat_count ? options->stat_count : data->nr;
1615
1616 reset = diff_get_color_opt(options, DIFF_RESET);
1617 add_c = diff_get_color_opt(options, DIFF_FILE_NEW);
1618 del_c = diff_get_color_opt(options, DIFF_FILE_OLD);
1619
1620 /*
1621 * Find the longest filename and max number of changes
1622 */
1623 for (i = 0; (i < count) && (i < data->nr); i++) {
1624 struct diffstat_file *file = data->files[i];
1625 uintmax_t change = file->added + file->deleted;
1626
1627 if (!file->is_interesting && (change == 0)) {
1628 count++; /* not shown == room for one more */
1629 continue;
1630 }
1631 fill_print_name(file);
1632 len = strlen(file->print_name);
1633 if (max_len < len)
1634 max_len = len;
1635
1636 if (file->is_unmerged) {
1637 /* "Unmerged" is 8 characters */
1638 bin_width = bin_width < 8 ? 8 : bin_width;
1639 continue;
1640 }
1641 if (file->is_binary) {
1642 /* "Bin XXX -> YYY bytes" */
1643 int w = 14 + decimal_width(file->added)
1644 + decimal_width(file->deleted);
1645 bin_width = bin_width < w ? w : bin_width;
1646 /* Display change counts aligned with "Bin" */
1647 number_width = 3;
1648 continue;
1649 }
1650
1651 if (max_change < change)
1652 max_change = change;
1653 }
1654 count = i; /* where we can stop scanning in data->files[] */
1655
1656 /*
1657 * We have width = stat_width or term_columns() columns total.
1658 * We want a maximum of min(max_len, stat_name_width) for the name part.
1659 * We want a maximum of min(max_change, stat_graph_width) for the +- part.
1660 * We also need 1 for " " and 4 + decimal_width(max_change)
1661 * for " | NNNN " and one the empty column at the end, altogether
1662 * 6 + decimal_width(max_change).
1663 *
1664 * If there's not enough space, we will use the smaller of
1665 * stat_name_width (if set) and 5/8*width for the filename,
1666 * and the rest for constant elements + graph part, but no more
1667 * than stat_graph_width for the graph part.
1668 * (5/8 gives 50 for filename and 30 for the constant parts + graph
1669 * for the standard terminal size).
1670 *
1671 * In other words: stat_width limits the maximum width, and
1672 * stat_name_width fixes the maximum width of the filename,
1673 * and is also used to divide available columns if there
1674 * aren't enough.
1675 *
1676 * Binary files are displayed with "Bin XXX -> YYY bytes"
1677 * instead of the change count and graph. This part is treated
1678 * similarly to the graph part, except that it is not
1679 * "scaled". If total width is too small to accommodate the
1680 * guaranteed minimum width of the filename part and the
1681 * separators and this message, this message will "overflow"
1682 * making the line longer than the maximum width.
1683 */
1684
1685 if (options->stat_width == -1)
1686 width = term_columns() - strlen(line_prefix);
1687 else
1688 width = options->stat_width ? options->stat_width : 80;
1689 number_width = decimal_width(max_change) > number_width ?
1690 decimal_width(max_change) : number_width;
1691
1692 if (options->stat_graph_width == -1)
1693 options->stat_graph_width = diff_stat_graph_width;
1694
1695 /*
1696 * Guarantee 3/8*16==6 for the graph part
1697 * and 5/8*16==10 for the filename part
1698 */
1699 if (width < 16 + 6 + number_width)
1700 width = 16 + 6 + number_width;
1701
1702 /*
1703 * First assign sizes that are wanted, ignoring available width.
1704 * strlen("Bin XXX -> YYY bytes") == bin_width, and the part
1705 * starting from "XXX" should fit in graph_width.
1706 */
1707 graph_width = max_change + 4 > bin_width ? max_change : bin_width - 4;
1708 if (options->stat_graph_width &&
1709 options->stat_graph_width < graph_width)
1710 graph_width = options->stat_graph_width;
1711
1712 name_width = (options->stat_name_width > 0 &&
1713 options->stat_name_width < max_len) ?
1714 options->stat_name_width : max_len;
1715
1716 /*
1717 * Adjust adjustable widths not to exceed maximum width
1718 */
1719 if (name_width + number_width + 6 + graph_width > width) {
1720 if (graph_width > width * 3/8 - number_width - 6) {
1721 graph_width = width * 3/8 - number_width - 6;
1722 if (graph_width < 6)
1723 graph_width = 6;
1724 }
1725
1726 if (options->stat_graph_width &&
1727 graph_width > options->stat_graph_width)
1728 graph_width = options->stat_graph_width;
1729 if (name_width > width - number_width - 6 - graph_width)
1730 name_width = width - number_width - 6 - graph_width;
1731 else
1732 graph_width = width - number_width - 6 - name_width;
1733 }
1734
1735 /*
1736 * From here name_width is the width of the name area,
1737 * and graph_width is the width of the graph area.
1738 * max_change is used to scale graph properly.
1739 */
1740 for (i = 0; i < count; i++) {
1741 const char *prefix = "";
1742 struct diffstat_file *file = data->files[i];
1743 char *name = file->print_name;
1744 uintmax_t added = file->added;
1745 uintmax_t deleted = file->deleted;
1746 int name_len;
1747
1748 if (!file->is_interesting && (added + deleted == 0))
1749 continue;
1750
1751 /*
1752 * "scale" the filename
1753 */
1754 len = name_width;
1755 name_len = strlen(name);
1756 if (name_width < name_len) {
1757 char *slash;
1758 prefix = "...";
1759 len -= 3;
1760 name += name_len - len;
1761 slash = strchr(name, '/');
1762 if (slash)
1763 name = slash;
1764 }
1765
1766 if (file->is_binary) {
1767 fprintf(options->file, "%s", line_prefix);
1768 show_name(options->file, prefix, name, len);
1769 fprintf(options->file, " %*s", number_width, "Bin");
1770 if (!added && !deleted) {
1771 putc('\n', options->file);
1772 continue;
1773 }
1774 fprintf(options->file, " %s%"PRIuMAX"%s",
1775 del_c, deleted, reset);
1776 fprintf(options->file, " -> ");
1777 fprintf(options->file, "%s%"PRIuMAX"%s",
1778 add_c, added, reset);
1779 fprintf(options->file, " bytes");
1780 fprintf(options->file, "\n");
1781 continue;
1782 }
1783 else if (file->is_unmerged) {
1784 fprintf(options->file, "%s", line_prefix);
1785 show_name(options->file, prefix, name, len);
1786 fprintf(options->file, " Unmerged\n");
1787 continue;
1788 }
1789
1790 /*
1791 * scale the add/delete
1792 */
1793 add = added;
1794 del = deleted;
1795
1796 if (graph_width <= max_change) {
1797 int total = scale_linear(add + del, graph_width, max_change);
1798 if (total < 2 && add && del)
1799 /* width >= 2 due to the sanity check */
1800 total = 2;
1801 if (add < del) {
1802 add = scale_linear(add, graph_width, max_change);
1803 del = total - add;
1804 } else {
1805 del = scale_linear(del, graph_width, max_change);
1806 add = total - del;
1807 }
1808 }
1809 fprintf(options->file, "%s", line_prefix);
1810 show_name(options->file, prefix, name, len);
1811 fprintf(options->file, " %*"PRIuMAX"%s",
1812 number_width, added + deleted,
1813 added + deleted ? " " : "");
1814 show_graph(options->file, '+', add, add_c, reset);
1815 show_graph(options->file, '-', del, del_c, reset);
1816 fprintf(options->file, "\n");
1817 }
1818
1819 for (i = 0; i < data->nr; i++) {
1820 struct diffstat_file *file = data->files[i];
1821 uintmax_t added = file->added;
1822 uintmax_t deleted = file->deleted;
1823
1824 if (file->is_unmerged ||
1825 (!file->is_interesting && (added + deleted == 0))) {
1826 total_files--;
1827 continue;
1828 }
1829
1830 if (!file->is_binary) {
1831 adds += added;
1832 dels += deleted;
1833 }
1834 if (i < count)
1835 continue;
1836 if (!extra_shown)
1837 fprintf(options->file, "%s ...\n", line_prefix);
1838 extra_shown = 1;
1839 }
1840 fprintf(options->file, "%s", line_prefix);
1841 print_stat_summary(options->file, total_files, adds, dels);
1842 }
1843
1844 static void show_shortstats(struct diffstat_t *data, struct diff_options *options)
1845 {
1846 int i, adds = 0, dels = 0, total_files = data->nr;
1847
1848 if (data->nr == 0)
1849 return;
1850
1851 for (i = 0; i < data->nr; i++) {
1852 int added = data->files[i]->added;
1853 int deleted= data->files[i]->deleted;
1854
1855 if (data->files[i]->is_unmerged ||
1856 (!data->files[i]->is_interesting && (added + deleted == 0))) {
1857 total_files--;
1858 } else if (!data->files[i]->is_binary) { /* don't count bytes */
1859 adds += added;
1860 dels += deleted;
1861 }
1862 }
1863 fprintf(options->file, "%s", diff_line_prefix(options));
1864 print_stat_summary(options->file, total_files, adds, dels);
1865 }
1866
1867 static void show_numstat(struct diffstat_t *data, struct diff_options *options)
1868 {
1869 int i;
1870
1871 if (data->nr == 0)
1872 return;
1873
1874 for (i = 0; i < data->nr; i++) {
1875 struct diffstat_file *file = data->files[i];
1876
1877 fprintf(options->file, "%s", diff_line_prefix(options));
1878
1879 if (file->is_binary)
1880 fprintf(options->file, "-\t-\t");
1881 else
1882 fprintf(options->file,
1883 "%"PRIuMAX"\t%"PRIuMAX"\t",
1884 file->added, file->deleted);
1885 if (options->line_termination) {
1886 fill_print_name(file);
1887 if (!file->is_renamed)
1888 write_name_quoted(file->name, options->file,
1889 options->line_termination);
1890 else {
1891 fputs(file->print_name, options->file);
1892 putc(options->line_termination, options->file);
1893 }
1894 } else {
1895 if (file->is_renamed) {
1896 putc('\0', options->file);
1897 write_name_quoted(file->from_name, options->file, '\0');
1898 }
1899 write_name_quoted(file->name, options->file, '\0');
1900 }
1901 }
1902 }
1903
1904 struct dirstat_file {
1905 const char *name;
1906 unsigned long changed;
1907 };
1908
1909 struct dirstat_dir {
1910 struct dirstat_file *files;
1911 int alloc, nr, permille, cumulative;
1912 };
1913
1914 static long gather_dirstat(struct diff_options *opt, struct dirstat_dir *dir,
1915 unsigned long changed, const char *base, int baselen)
1916 {
1917 unsigned long this_dir = 0;
1918 unsigned int sources = 0;
1919 const char *line_prefix = diff_line_prefix(opt);
1920
1921 while (dir->nr) {
1922 struct dirstat_file *f = dir->files;
1923 int namelen = strlen(f->name);
1924 unsigned long this;
1925 char *slash;
1926
1927 if (namelen < baselen)
1928 break;
1929 if (memcmp(f->name, base, baselen))
1930 break;
1931 slash = strchr(f->name + baselen, '/');
1932 if (slash) {
1933 int newbaselen = slash + 1 - f->name;
1934 this = gather_dirstat(opt, dir, changed, f->name, newbaselen);
1935 sources++;
1936 } else {
1937 this = f->changed;
1938 dir->files++;
1939 dir->nr--;
1940 sources += 2;
1941 }
1942 this_dir += this;
1943 }
1944
1945 /*
1946 * We don't report dirstat's for
1947 * - the top level
1948 * - or cases where everything came from a single directory
1949 * under this directory (sources == 1).
1950 */
1951 if (baselen && sources != 1) {
1952 if (this_dir) {
1953 int permille = this_dir * 1000 / changed;
1954 if (permille >= dir->permille) {
1955 fprintf(opt->file, "%s%4d.%01d%% %.*s\n", line_prefix,
1956 permille / 10, permille % 10, baselen, base);
1957 if (!dir->cumulative)
1958 return 0;
1959 }
1960 }
1961 }
1962 return this_dir;
1963 }
1964
1965 static int dirstat_compare(const void *_a, const void *_b)
1966 {
1967 const struct dirstat_file *a = _a;
1968 const struct dirstat_file *b = _b;
1969 return strcmp(a->name, b->name);
1970 }
1971
1972 static void show_dirstat(struct diff_options *options)
1973 {
1974 int i;
1975 unsigned long changed;
1976 struct dirstat_dir dir;
1977 struct diff_queue_struct *q = &diff_queued_diff;
1978
1979 dir.files = NULL;
1980 dir.alloc = 0;
1981 dir.nr = 0;
1982 dir.permille = options->dirstat_permille;
1983 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
1984
1985 changed = 0;
1986 for (i = 0; i < q->nr; i++) {
1987 struct diff_filepair *p = q->queue[i];
1988 const char *name;
1989 unsigned long copied, added, damage;
1990 int content_changed;
1991
1992 name = p->two->path ? p->two->path : p->one->path;
1993
1994 if (p->one->oid_valid && p->two->oid_valid)
1995 content_changed = oidcmp(&p->one->oid, &p->two->oid);
1996 else
1997 content_changed = 1;
1998
1999 if (!content_changed) {
2000 /*
2001 * The SHA1 has not changed, so pre-/post-content is
2002 * identical. We can therefore skip looking at the
2003 * file contents altogether.
2004 */
2005 damage = 0;
2006 goto found_damage;
2007 }
2008
2009 if (DIFF_OPT_TST(options, DIRSTAT_BY_FILE)) {
2010 /*
2011 * In --dirstat-by-file mode, we don't really need to
2012 * look at the actual file contents at all.
2013 * The fact that the SHA1 changed is enough for us to
2014 * add this file to the list of results
2015 * (with each file contributing equal damage).
2016 */
2017 damage = 1;
2018 goto found_damage;
2019 }
2020
2021 if (DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) {
2022 diff_populate_filespec(p->one, 0);
2023 diff_populate_filespec(p->two, 0);
2024 diffcore_count_changes(p->one, p->two, NULL, NULL,
2025 &copied, &added);
2026 diff_free_filespec_data(p->one);
2027 diff_free_filespec_data(p->two);
2028 } else if (DIFF_FILE_VALID(p->one)) {
2029 diff_populate_filespec(p->one, CHECK_SIZE_ONLY);
2030 copied = added = 0;
2031 diff_free_filespec_data(p->one);
2032 } else if (DIFF_FILE_VALID(p->two)) {
2033 diff_populate_filespec(p->two, CHECK_SIZE_ONLY);
2034 copied = 0;
2035 added = p->two->size;
2036 diff_free_filespec_data(p->two);
2037 } else
2038 continue;
2039
2040 /*
2041 * Original minus copied is the removed material,
2042 * added is the new material. They are both damages
2043 * made to the preimage.
2044 * If the resulting damage is zero, we know that
2045 * diffcore_count_changes() considers the two entries to
2046 * be identical, but since content_changed is true, we
2047 * know that there must have been _some_ kind of change,
2048 * so we force all entries to have damage > 0.
2049 */
2050 damage = (p->one->size - copied) + added;
2051 if (!damage)
2052 damage = 1;
2053
2054 found_damage:
2055 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
2056 dir.files[dir.nr].name = name;
2057 dir.files[dir.nr].changed = damage;
2058 changed += damage;
2059 dir.nr++;
2060 }
2061
2062 /* This can happen even with many files, if everything was renames */
2063 if (!changed)
2064 return;
2065
2066 /* Show all directories with more than x% of the changes */
2067 QSORT(dir.files, dir.nr, dirstat_compare);
2068 gather_dirstat(options, &dir, changed, "", 0);
2069 }
2070
2071 static void show_dirstat_by_line(struct diffstat_t *data, struct diff_options *options)
2072 {
2073 int i;
2074 unsigned long changed;
2075 struct dirstat_dir dir;
2076
2077 if (data->nr == 0)
2078 return;
2079
2080 dir.files = NULL;
2081 dir.alloc = 0;
2082 dir.nr = 0;
2083 dir.permille = options->dirstat_permille;
2084 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
2085
2086 changed = 0;
2087 for (i = 0; i < data->nr; i++) {
2088 struct diffstat_file *file = data->files[i];
2089 unsigned long damage = file->added + file->deleted;
2090 if (file->is_binary)
2091 /*
2092 * binary files counts bytes, not lines. Must find some
2093 * way to normalize binary bytes vs. textual lines.
2094 * The following heuristic assumes that there are 64
2095 * bytes per "line".
2096 * This is stupid and ugly, but very cheap...
2097 */
2098 damage = (damage + 63) / 64;
2099 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
2100 dir.files[dir.nr].name = file->name;
2101 dir.files[dir.nr].changed = damage;
2102 changed += damage;
2103 dir.nr++;
2104 }
2105
2106 /* This can happen even with many files, if everything was renames */
2107 if (!changed)
2108 return;
2109
2110 /* Show all directories with more than x% of the changes */
2111 QSORT(dir.files, dir.nr, dirstat_compare);
2112 gather_dirstat(options, &dir, changed, "", 0);
2113 }
2114
2115 static void free_diffstat_info(struct diffstat_t *diffstat)
2116 {
2117 int i;
2118 for (i = 0; i < diffstat->nr; i++) {
2119 struct diffstat_file *f = diffstat->files[i];
2120 if (f->name != f->print_name)
2121 free(f->print_name);
2122 free(f->name);
2123 free(f->from_name);
2124 free(f);
2125 }
2126 free(diffstat->files);
2127 }
2128
2129 struct checkdiff_t {
2130 const char *filename;
2131 int lineno;
2132 int conflict_marker_size;
2133 struct diff_options *o;
2134 unsigned ws_rule;
2135 unsigned status;
2136 };
2137
2138 static int is_conflict_marker(const char *line, int marker_size, unsigned long len)
2139 {
2140 char firstchar;
2141 int cnt;
2142
2143 if (len < marker_size + 1)
2144 return 0;
2145 firstchar = line[0];
2146 switch (firstchar) {
2147 case '=': case '>': case '<': case '|':
2148 break;
2149 default:
2150 return 0;
2151 }
2152 for (cnt = 1; cnt < marker_size; cnt++)
2153 if (line[cnt] != firstchar)
2154 return 0;
2155 /* line[1] thru line[marker_size-1] are same as firstchar */
2156 if (len < marker_size + 1 || !isspace(line[marker_size]))
2157 return 0;
2158 return 1;
2159 }
2160
2161 static void checkdiff_consume(void *priv, char *line, unsigned long len)
2162 {
2163 struct checkdiff_t *data = priv;
2164 int marker_size = data->conflict_marker_size;
2165 const char *ws = diff_get_color(data->o->use_color, DIFF_WHITESPACE);
2166 const char *reset = diff_get_color(data->o->use_color, DIFF_RESET);
2167 const char *set = diff_get_color(data->o->use_color, DIFF_FILE_NEW);
2168 char *err;
2169 const char *line_prefix;
2170
2171 assert(data->o);
2172 line_prefix = diff_line_prefix(data->o);
2173
2174 if (line[0] == '+') {
2175 unsigned bad;
2176 data->lineno++;
2177 if (is_conflict_marker(line + 1, marker_size, len - 1)) {
2178 data->status |= 1;
2179 fprintf(data->o->file,
2180 "%s%s:%d: leftover conflict marker\n",
2181 line_prefix, data->filename, data->lineno);
2182 }
2183 bad = ws_check(line + 1, len - 1, data->ws_rule);
2184 if (!bad)
2185 return;
2186 data->status |= bad;
2187 err = whitespace_error_string(bad);
2188 fprintf(data->o->file, "%s%s:%d: %s.\n",
2189 line_prefix, data->filename, data->lineno, err);
2190 free(err);
2191 emit_line(data->o, set, reset, line, 1);
2192 ws_check_emit(line + 1, len - 1, data->ws_rule,
2193 data->o->file, set, reset, ws);
2194 } else if (line[0] == ' ') {
2195 data->lineno++;
2196 } else if (line[0] == '@') {
2197 char *plus = strchr(line, '+');
2198 if (plus)
2199 data->lineno = strtol(plus, NULL, 10) - 1;
2200 else
2201 die("invalid diff");
2202 }
2203 }
2204
2205 static unsigned char *deflate_it(char *data,
2206 unsigned long size,
2207 unsigned long *result_size)
2208 {
2209 int bound;
2210 unsigned char *deflated;
2211 git_zstream stream;
2212
2213 git_deflate_init(&stream, zlib_compression_level);
2214 bound = git_deflate_bound(&stream, size);
2215 deflated = xmalloc(bound);
2216 stream.next_out = deflated;
2217 stream.avail_out = bound;
2218
2219 stream.next_in = (unsigned char *)data;
2220 stream.avail_in = size;
2221 while (git_deflate(&stream, Z_FINISH) == Z_OK)
2222 ; /* nothing */
2223 git_deflate_end(&stream);
2224 *result_size = stream.total_out;
2225 return deflated;
2226 }
2227
2228 static void emit_binary_diff_body(FILE *file, mmfile_t *one, mmfile_t *two,
2229 const char *prefix)
2230 {
2231 void *cp;
2232 void *delta;
2233 void *deflated;
2234 void *data;
2235 unsigned long orig_size;
2236 unsigned long delta_size;
2237 unsigned long deflate_size;
2238 unsigned long data_size;
2239
2240 /* We could do deflated delta, or we could do just deflated two,
2241 * whichever is smaller.
2242 */
2243 delta = NULL;
2244 deflated = deflate_it(two->ptr, two->size, &deflate_size);
2245 if (one->size && two->size) {
2246 delta = diff_delta(one->ptr, one->size,
2247 two->ptr, two->size,
2248 &delta_size, deflate_size);
2249 if (delta) {
2250 void *to_free = delta;
2251 orig_size = delta_size;
2252 delta = deflate_it(delta, delta_size, &delta_size);
2253 free(to_free);
2254 }
2255 }
2256
2257 if (delta && delta_size < deflate_size) {
2258 fprintf(file, "%sdelta %lu\n", prefix, orig_size);
2259 free(deflated);
2260 data = delta;
2261 data_size = delta_size;
2262 }
2263 else {
2264 fprintf(file, "%sliteral %lu\n", prefix, two->size);
2265 free(delta);
2266 data = deflated;
2267 data_size = deflate_size;
2268 }
2269
2270 /* emit data encoded in base85 */
2271 cp = data;
2272 while (data_size) {
2273 int bytes = (52 < data_size) ? 52 : data_size;
2274 char line[70];
2275 data_size -= bytes;
2276 if (bytes <= 26)
2277 line[0] = bytes + 'A' - 1;
2278 else
2279 line[0] = bytes - 26 + 'a' - 1;
2280 encode_85(line + 1, cp, bytes);
2281 cp = (char *) cp + bytes;
2282 fprintf(file, "%s", prefix);
2283 fputs(line, file);
2284 fputc('\n', file);
2285 }
2286 fprintf(file, "%s\n", prefix);
2287 free(data);
2288 }
2289
2290 static void emit_binary_diff(FILE *file, mmfile_t *one, mmfile_t *two,
2291 const char *prefix)
2292 {
2293 fprintf(file, "%sGIT binary patch\n", prefix);
2294 emit_binary_diff_body(file, one, two, prefix);
2295 emit_binary_diff_body(file, two, one, prefix);
2296 }
2297
2298 int diff_filespec_is_binary(struct diff_filespec *one)
2299 {
2300 if (one->is_binary == -1) {
2301 diff_filespec_load_driver(one);
2302 if (one->driver->binary != -1)
2303 one->is_binary = one->driver->binary;
2304 else {
2305 if (!one->data && DIFF_FILE_VALID(one))
2306 diff_populate_filespec(one, CHECK_BINARY);
2307 if (one->is_binary == -1 && one->data)
2308 one->is_binary = buffer_is_binary(one->data,
2309 one->size);
2310 if (one->is_binary == -1)
2311 one->is_binary = 0;
2312 }
2313 }
2314 return one->is_binary;
2315 }
2316
2317 static const struct userdiff_funcname *diff_funcname_pattern(struct diff_filespec *one)
2318 {
2319 diff_filespec_load_driver(one);
2320 return one->driver->funcname.pattern ? &one->driver->funcname : NULL;
2321 }
2322
2323 void diff_set_mnemonic_prefix(struct diff_options *options, const char *a, const char *b)
2324 {
2325 if (!options->a_prefix)
2326 options->a_prefix = a;
2327 if (!options->b_prefix)
2328 options->b_prefix = b;
2329 }
2330
2331 struct userdiff_driver *get_textconv(struct diff_filespec *one)
2332 {
2333 if (!DIFF_FILE_VALID(one))
2334 return NULL;
2335
2336 diff_filespec_load_driver(one);
2337 return userdiff_get_textconv(one->driver);
2338 }
2339
2340 static void builtin_diff(const char *name_a,
2341 const char *name_b,
2342 struct diff_filespec *one,
2343 struct diff_filespec *two,
2344 const char *xfrm_msg,
2345 int must_show_header,
2346 struct diff_options *o,
2347 int complete_rewrite)
2348 {
2349 mmfile_t mf1, mf2;
2350 const char *lbl[2];
2351 char *a_one, *b_two;
2352 const char *meta = diff_get_color_opt(o, DIFF_METAINFO);
2353 const char *reset = diff_get_color_opt(o, DIFF_RESET);
2354 const char *a_prefix, *b_prefix;
2355 struct userdiff_driver *textconv_one = NULL;
2356 struct userdiff_driver *textconv_two = NULL;
2357 struct strbuf header = STRBUF_INIT;
2358 const char *line_prefix = diff_line_prefix(o);
2359
2360 diff_set_mnemonic_prefix(o, "a/", "b/");
2361 if (DIFF_OPT_TST(o, REVERSE_DIFF)) {
2362 a_prefix = o->b_prefix;
2363 b_prefix = o->a_prefix;
2364 } else {
2365 a_prefix = o->a_prefix;
2366 b_prefix = o->b_prefix;
2367 }
2368
2369 if (o->submodule_format == DIFF_SUBMODULE_LOG &&
2370 (!one->mode || S_ISGITLINK(one->mode)) &&
2371 (!two->mode || S_ISGITLINK(two->mode))) {
2372 const char *del = diff_get_color_opt(o, DIFF_FILE_OLD);
2373 const char *add = diff_get_color_opt(o, DIFF_FILE_NEW);
2374 show_submodule_summary(o->file, one->path ? one->path : two->path,
2375 line_prefix,
2376 &one->oid, &two->oid,
2377 two->dirty_submodule,
2378 meta, del, add, reset);
2379 return;
2380 } else if (o->submodule_format == DIFF_SUBMODULE_INLINE_DIFF &&
2381 (!one->mode || S_ISGITLINK(one->mode)) &&
2382 (!two->mode || S_ISGITLINK(two->mode))) {
2383 const char *del = diff_get_color_opt(o, DIFF_FILE_OLD);
2384 const char *add = diff_get_color_opt(o, DIFF_FILE_NEW);
2385 show_submodule_inline_diff(o->file, one->path ? one->path : two->path,
2386 line_prefix,
2387 &one->oid, &two->oid,
2388 two->dirty_submodule,
2389 meta, del, add, reset, o);
2390 return;
2391 }
2392
2393 if (DIFF_OPT_TST(o, ALLOW_TEXTCONV)) {
2394 textconv_one = get_textconv(one);
2395 textconv_two = get_textconv(two);
2396 }
2397
2398 /* Never use a non-valid filename anywhere if at all possible */
2399 name_a = DIFF_FILE_VALID(one) ? name_a : name_b;
2400 name_b = DIFF_FILE_VALID(two) ? name_b : name_a;
2401
2402 a_one = quote_two(a_prefix, name_a + (*name_a == '/'));
2403 b_two = quote_two(b_prefix, name_b + (*name_b == '/'));
2404 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
2405 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
2406 strbuf_addf(&header, "%s%sdiff --git %s %s%s\n", line_prefix, meta, a_one, b_two, reset);
2407 if (lbl[0][0] == '/') {
2408 /* /dev/null */
2409 strbuf_addf(&header, "%s%snew file mode %06o%s\n", line_prefix, meta, two->mode, reset);
2410 if (xfrm_msg)
2411 strbuf_addstr(&header, xfrm_msg);
2412 must_show_header = 1;
2413 }
2414 else if (lbl[1][0] == '/') {
2415 strbuf_addf(&header, "%s%sdeleted file mode %06o%s\n", line_prefix, meta, one->mode, reset);
2416 if (xfrm_msg)
2417 strbuf_addstr(&header, xfrm_msg);
2418 must_show_header = 1;
2419 }
2420 else {
2421 if (one->mode != two->mode) {
2422 strbuf_addf(&header, "%s%sold mode %06o%s\n", line_prefix, meta, one->mode, reset);
2423 strbuf_addf(&header, "%s%snew mode %06o%s\n", line_prefix, meta, two->mode, reset);
2424 must_show_header = 1;
2425 }
2426 if (xfrm_msg)
2427 strbuf_addstr(&header, xfrm_msg);
2428
2429 /*
2430 * we do not run diff between different kind
2431 * of objects.
2432 */
2433 if ((one->mode ^ two->mode) & S_IFMT)
2434 goto free_ab_and_return;
2435 if (complete_rewrite &&
2436 (textconv_one || !diff_filespec_is_binary(one)) &&
2437 (textconv_two || !diff_filespec_is_binary(two))) {
2438 fprintf(o->file, "%s", header.buf);
2439 strbuf_reset(&header);
2440 emit_rewrite_diff(name_a, name_b, one, two,
2441 textconv_one, textconv_two, o);
2442 o->found_changes = 1;
2443 goto free_ab_and_return;
2444 }
2445 }
2446
2447 if (o->irreversible_delete && lbl[1][0] == '/') {
2448 fprintf(o->file, "%s", header.buf);
2449 strbuf_reset(&header);
2450 goto free_ab_and_return;
2451 } else if (!DIFF_OPT_TST(o, TEXT) &&
2452 ( (!textconv_one && diff_filespec_is_binary(one)) ||
2453 (!textconv_two && diff_filespec_is_binary(two)) )) {
2454 if (!one->data && !two->data &&
2455 S_ISREG(one->mode) && S_ISREG(two->mode) &&
2456 !DIFF_OPT_TST(o, BINARY)) {
2457 if (!oidcmp(&one->oid, &two->oid)) {
2458 if (must_show_header)
2459 fprintf(o->file, "%s", header.buf);
2460 goto free_ab_and_return;
2461 }
2462 fprintf(o->file, "%s", header.buf);
2463 fprintf(o->file, "%sBinary files %s and %s differ\n",
2464 line_prefix, lbl[0], lbl[1]);
2465 goto free_ab_and_return;
2466 }
2467 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2468 die("unable to read files to diff");
2469 /* Quite common confusing case */
2470 if (mf1.size == mf2.size &&
2471 !memcmp(mf1.ptr, mf2.ptr, mf1.size)) {
2472 if (must_show_header)
2473 fprintf(o->file, "%s", header.buf);
2474 goto free_ab_and_return;
2475 }
2476 fprintf(o->file, "%s", header.buf);
2477 strbuf_reset(&header);
2478 if (DIFF_OPT_TST(o, BINARY))
2479 emit_binary_diff(o->file, &mf1, &mf2, line_prefix);
2480 else
2481 fprintf(o->file, "%sBinary files %s and %s differ\n",
2482 line_prefix, lbl[0], lbl[1]);
2483 o->found_changes = 1;
2484 } else {
2485 /* Crazy xdl interfaces.. */
2486 const char *diffopts = getenv("GIT_DIFF_OPTS");
2487 const char *v;
2488 xpparam_t xpp;
2489 xdemitconf_t xecfg;
2490 struct emit_callback ecbdata;
2491 const struct userdiff_funcname *pe;
2492
2493 if (must_show_header) {
2494 fprintf(o->file, "%s", header.buf);
2495 strbuf_reset(&header);
2496 }
2497
2498 mf1.size = fill_textconv(textconv_one, one, &mf1.ptr);
2499 mf2.size = fill_textconv(textconv_two, two, &mf2.ptr);
2500
2501 pe = diff_funcname_pattern(one);
2502 if (!pe)
2503 pe = diff_funcname_pattern(two);
2504
2505 memset(&xpp, 0, sizeof(xpp));
2506 memset(&xecfg, 0, sizeof(xecfg));
2507 memset(&ecbdata, 0, sizeof(ecbdata));
2508 ecbdata.label_path = lbl;
2509 ecbdata.color_diff = want_color(o->use_color);
2510 ecbdata.ws_rule = whitespace_rule(name_b);
2511 if (ecbdata.ws_rule & WS_BLANK_AT_EOF)
2512 check_blank_at_eof(&mf1, &mf2, &ecbdata);
2513 ecbdata.opt = o;
2514 ecbdata.header = header.len ? &header : NULL;
2515 xpp.flags = o->xdl_opts;
2516 xecfg.ctxlen = o->context;
2517 xecfg.interhunkctxlen = o->interhunkcontext;
2518 xecfg.flags = XDL_EMIT_FUNCNAMES;
2519 if (DIFF_OPT_TST(o, FUNCCONTEXT))
2520 xecfg.flags |= XDL_EMIT_FUNCCONTEXT;
2521 if (pe)
2522 xdiff_set_find_func(&xecfg, pe->pattern, pe->cflags);
2523 if (!diffopts)
2524 ;
2525 else if (skip_prefix(diffopts, "--unified=", &v))
2526 xecfg.ctxlen = strtoul(v, NULL, 10);
2527 else if (skip_prefix(diffopts, "-u", &v))
2528 xecfg.ctxlen = strtoul(v, NULL, 10);
2529 if (o->word_diff)
2530 init_diff_words_data(&ecbdata, o, one, two);
2531 if (xdi_diff_outf(&mf1, &mf2, fn_out_consume, &ecbdata,
2532 &xpp, &xecfg))
2533 die("unable to generate diff for %s", one->path);
2534 if (o->word_diff)
2535 free_diff_words_data(&ecbdata);
2536 if (textconv_one)
2537 free(mf1.ptr);
2538 if (textconv_two)
2539 free(mf2.ptr);
2540 xdiff_clear_find_func(&xecfg);
2541 }
2542
2543 free_ab_and_return:
2544 strbuf_release(&header);
2545 diff_free_filespec_data(one);
2546 diff_free_filespec_data(two);
2547 free(a_one);
2548 free(b_two);
2549 return;
2550 }
2551
2552 static void builtin_diffstat(const char *name_a, const char *name_b,
2553 struct diff_filespec *one,
2554 struct diff_filespec *two,
2555 struct diffstat_t *diffstat,
2556 struct diff_options *o,
2557 struct diff_filepair *p)
2558 {
2559 mmfile_t mf1, mf2;
2560 struct diffstat_file *data;
2561 int same_contents;
2562 int complete_rewrite = 0;
2563
2564 if (!DIFF_PAIR_UNMERGED(p)) {
2565 if (p->status == DIFF_STATUS_MODIFIED && p->score)
2566 complete_rewrite = 1;
2567 }
2568
2569 data = diffstat_add(diffstat, name_a, name_b);
2570 data->is_interesting = p->status != DIFF_STATUS_UNKNOWN;
2571
2572 if (!one || !two) {
2573 data->is_unmerged = 1;
2574 return;
2575 }
2576
2577 same_contents = !oidcmp(&one->oid, &two->oid);
2578
2579 if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
2580 data->is_binary = 1;
2581 if (same_contents) {
2582 data->added = 0;
2583 data->deleted = 0;
2584 } else {
2585 data->added = diff_filespec_size(two);
2586 data->deleted = diff_filespec_size(one);
2587 }
2588 }
2589
2590 else if (complete_rewrite) {
2591 diff_populate_filespec(one, 0);
2592 diff_populate_filespec(two, 0);
2593 data->deleted = count_lines(one->data, one->size);
2594 data->added = count_lines(two->data, two->size);
2595 }
2596
2597 else if (!same_contents) {
2598 /* Crazy xdl interfaces.. */
2599 xpparam_t xpp;
2600 xdemitconf_t xecfg;
2601
2602 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2603 die("unable to read files to diff");
2604
2605 memset(&xpp, 0, sizeof(xpp));
2606 memset(&xecfg, 0, sizeof(xecfg));
2607 xpp.flags = o->xdl_opts;
2608 xecfg.ctxlen = o->context;
2609 xecfg.interhunkctxlen = o->interhunkcontext;
2610 if (xdi_diff_outf(&mf1, &mf2, diffstat_consume, diffstat,
2611 &xpp, &xecfg))
2612 die("unable to generate diffstat for %s", one->path);
2613 }
2614
2615 diff_free_filespec_data(one);
2616 diff_free_filespec_data(two);
2617 }
2618
2619 static void builtin_checkdiff(const char *name_a, const char *name_b,
2620 const char *attr_path,
2621 struct diff_filespec *one,
2622 struct diff_filespec *two,
2623 struct diff_options *o)
2624 {
2625 mmfile_t mf1, mf2;
2626 struct checkdiff_t data;
2627
2628 if (!two)
2629 return;
2630
2631 memset(&data, 0, sizeof(data));
2632 data.filename = name_b ? name_b : name_a;
2633 data.lineno = 0;
2634 data.o = o;
2635 data.ws_rule = whitespace_rule(attr_path);
2636 data.conflict_marker_size = ll_merge_marker_size(attr_path);
2637
2638 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2639 die("unable to read files to diff");
2640
2641 /*
2642 * All the other codepaths check both sides, but not checking
2643 * the "old" side here is deliberate. We are checking the newly
2644 * introduced changes, and as long as the "new" side is text, we
2645 * can and should check what it introduces.
2646 */
2647 if (diff_filespec_is_binary(two))
2648 goto free_and_return;
2649 else {
2650 /* Crazy xdl interfaces.. */
2651 xpparam_t xpp;
2652 xdemitconf_t xecfg;
2653
2654 memset(&xpp, 0, sizeof(xpp));
2655 memset(&xecfg, 0, sizeof(xecfg));
2656 xecfg.ctxlen = 1; /* at least one context line */
2657 xpp.flags = 0;
2658 if (xdi_diff_outf(&mf1, &mf2, checkdiff_consume, &data,
2659 &xpp, &xecfg))
2660 die("unable to generate checkdiff for %s", one->path);
2661
2662 if (data.ws_rule & WS_BLANK_AT_EOF) {
2663 struct emit_callback ecbdata;
2664 int blank_at_eof;
2665
2666 ecbdata.ws_rule = data.ws_rule;
2667 check_blank_at_eof(&mf1, &mf2, &ecbdata);
2668 blank_at_eof = ecbdata.blank_at_eof_in_postimage;
2669
2670 if (blank_at_eof) {
2671 static char *err;
2672 if (!err)
2673 err = whitespace_error_string(WS_BLANK_AT_EOF);
2674 fprintf(o->file, "%s:%d: %s.\n",
2675 data.filename, blank_at_eof, err);
2676 data.status = 1; /* report errors */
2677 }
2678 }
2679 }
2680 free_and_return:
2681 diff_free_filespec_data(one);
2682 diff_free_filespec_data(two);
2683 if (data.status)
2684 DIFF_OPT_SET(o, CHECK_FAILED);
2685 }
2686
2687 struct diff_filespec *alloc_filespec(const char *path)
2688 {
2689 struct diff_filespec *spec;
2690
2691 FLEXPTR_ALLOC_STR(spec, path, path);
2692 spec->count = 1;
2693 spec->is_binary = -1;
2694 return spec;
2695 }
2696
2697 void free_filespec(struct diff_filespec *spec)
2698 {
2699 if (!--spec->count) {
2700 diff_free_filespec_data(spec);
2701 free(spec);
2702 }
2703 }
2704
2705 void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
2706 int sha1_valid, unsigned short mode)
2707 {
2708 if (mode) {
2709 spec->mode = canon_mode(mode);
2710 hashcpy(spec->oid.hash, sha1);
2711 spec->oid_valid = sha1_valid;
2712 }
2713 }
2714
2715 /*
2716 * Given a name and sha1 pair, if the index tells us the file in
2717 * the work tree has that object contents, return true, so that
2718 * prepare_temp_file() does not have to inflate and extract.
2719 */
2720 static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file)
2721 {
2722 const struct cache_entry *ce;
2723 struct stat st;
2724 int pos, len;
2725
2726 /*
2727 * We do not read the cache ourselves here, because the
2728 * benchmark with my previous version that always reads cache
2729 * shows that it makes things worse for diff-tree comparing
2730 * two linux-2.6 kernel trees in an already checked out work
2731 * tree. This is because most diff-tree comparisons deal with
2732 * only a small number of files, while reading the cache is
2733 * expensive for a large project, and its cost outweighs the
2734 * savings we get by not inflating the object to a temporary
2735 * file. Practically, this code only helps when we are used
2736 * by diff-cache --cached, which does read the cache before
2737 * calling us.
2738 */
2739 if (!active_cache)
2740 return 0;
2741
2742 /* We want to avoid the working directory if our caller
2743 * doesn't need the data in a normal file, this system
2744 * is rather slow with its stat/open/mmap/close syscalls,
2745 * and the object is contained in a pack file. The pack
2746 * is probably already open and will be faster to obtain
2747 * the data through than the working directory. Loose
2748 * objects however would tend to be slower as they need
2749 * to be individually opened and inflated.
2750 */
2751 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1))
2752 return 0;
2753
2754 /*
2755 * Similarly, if we'd have to convert the file contents anyway, that
2756 * makes the optimization not worthwhile.
2757 */
2758 if (!want_file && would_convert_to_git(name))
2759 return 0;
2760
2761 len = strlen(name);
2762 pos = cache_name_pos(name, len);
2763 if (pos < 0)
2764 return 0;
2765 ce = active_cache[pos];
2766
2767 /*
2768 * This is not the sha1 we are looking for, or
2769 * unreusable because it is not a regular file.
2770 */
2771 if (hashcmp(sha1, ce->oid.hash) || !S_ISREG(ce->ce_mode))
2772 return 0;
2773
2774 /*
2775 * If ce is marked as "assume unchanged", there is no
2776 * guarantee that work tree matches what we are looking for.
2777 */
2778 if ((ce->ce_flags & CE_VALID) || ce_skip_worktree(ce))
2779 return 0;
2780
2781 /*
2782 * If ce matches the file in the work tree, we can reuse it.
2783 */
2784 if (ce_uptodate(ce) ||
2785 (!lstat(name, &st) && !ce_match_stat(ce, &st, 0)))
2786 return 1;
2787
2788 return 0;
2789 }
2790
2791 static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
2792 {
2793 struct strbuf buf = STRBUF_INIT;
2794 char *dirty = "";
2795
2796 /* Are we looking at the work tree? */
2797 if (s->dirty_submodule)
2798 dirty = "-dirty";
2799
2800 strbuf_addf(&buf, "Subproject commit %s%s\n",
2801 oid_to_hex(&s->oid), dirty);
2802 s->size = buf.len;
2803 if (size_only) {
2804 s->data = NULL;
2805 strbuf_release(&buf);
2806 } else {
2807 s->data = strbuf_detach(&buf, NULL);
2808 s->should_free = 1;
2809 }
2810 return 0;
2811 }
2812
2813 /*
2814 * While doing rename detection and pickaxe operation, we may need to
2815 * grab the data for the blob (or file) for our own in-core comparison.
2816 * diff_filespec has data and size fields for this purpose.
2817 */
2818 int diff_populate_filespec(struct diff_filespec *s, unsigned int flags)
2819 {
2820 int size_only = flags & CHECK_SIZE_ONLY;
2821 int err = 0;
2822 /*
2823 * demote FAIL to WARN to allow inspecting the situation
2824 * instead of refusing.
2825 */
2826 enum safe_crlf crlf_warn = (safe_crlf == SAFE_CRLF_FAIL
2827 ? SAFE_CRLF_WARN
2828 : safe_crlf);
2829
2830 if (!DIFF_FILE_VALID(s))
2831 die("internal error: asking to populate invalid file.");
2832 if (S_ISDIR(s->mode))
2833 return -1;
2834
2835 if (s->data)
2836 return 0;
2837
2838 if (size_only && 0 < s->size)
2839 return 0;
2840
2841 if (S_ISGITLINK(s->mode))
2842 return diff_populate_gitlink(s, size_only);
2843
2844 if (!s->oid_valid ||
2845 reuse_worktree_file(s->path, s->oid.hash, 0)) {
2846 struct strbuf buf = STRBUF_INIT;
2847 struct stat st;
2848 int fd;
2849
2850 if (lstat(s->path, &st) < 0) {
2851 if (errno == ENOENT) {
2852 err_empty:
2853 err = -1;
2854 empty:
2855 s->data = (char *)"";
2856 s->size = 0;
2857 return err;
2858 }
2859 }
2860 s->size = xsize_t(st.st_size);
2861 if (!s->size)
2862 goto empty;
2863 if (S_ISLNK(st.st_mode)) {
2864 struct strbuf sb = STRBUF_INIT;
2865
2866 if (strbuf_readlink(&sb, s->path, s->size))
2867 goto err_empty;
2868 s->size = sb.len;
2869 s->data = strbuf_detach(&sb, NULL);
2870 s->should_free = 1;
2871 return 0;
2872 }
2873
2874 /*
2875 * Even if the caller would be happy with getting
2876 * only the size, we cannot return early at this
2877 * point if the path requires us to run the content
2878 * conversion.
2879 */
2880 if (size_only && !would_convert_to_git(s->path))
2881 return 0;
2882
2883 /*
2884 * Note: this check uses xsize_t(st.st_size) that may
2885 * not be the true size of the blob after it goes
2886 * through convert_to_git(). This may not strictly be
2887 * correct, but the whole point of big_file_threshold
2888 * and is_binary check being that we want to avoid
2889 * opening the file and inspecting the contents, this
2890 * is probably fine.
2891 */
2892 if ((flags & CHECK_BINARY) &&
2893 s->size > big_file_threshold && s->is_binary == -1) {
2894 s->is_binary = 1;
2895 return 0;
2896 }
2897 fd = open(s->path, O_RDONLY);
2898 if (fd < 0)
2899 goto err_empty;
2900 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
2901 close(fd);
2902 s->should_munmap = 1;
2903
2904 /*
2905 * Convert from working tree format to canonical git format
2906 */
2907 if (convert_to_git(s->path, s->data, s->size, &buf, crlf_warn)) {
2908 size_t size = 0;
2909 munmap(s->data, s->size);
2910 s->should_munmap = 0;
2911 s->data = strbuf_detach(&buf, &size);
2912 s->size = size;
2913 s->should_free = 1;
2914 }
2915 }
2916 else {
2917 enum object_type type;
2918 if (size_only || (flags & CHECK_BINARY)) {
2919 type = sha1_object_info(s->oid.hash, &s->size);
2920 if (type < 0)
2921 die("unable to read %s",
2922 oid_to_hex(&s->oid));
2923 if (size_only)
2924 return 0;
2925 if (s->size > big_file_threshold && s->is_binary == -1) {
2926 s->is_binary = 1;
2927 return 0;
2928 }
2929 }
2930 s->data = read_sha1_file(s->oid.hash, &type, &s->size);
2931 if (!s->data)
2932 die("unable to read %s", oid_to_hex(&s->oid));
2933 s->should_free = 1;
2934 }
2935 return 0;
2936 }
2937
2938 void diff_free_filespec_blob(struct diff_filespec *s)
2939 {
2940 if (s->should_free)
2941 free(s->data);
2942 else if (s->should_munmap)
2943 munmap(s->data, s->size);
2944
2945 if (s->should_free || s->should_munmap) {
2946 s->should_free = s->should_munmap = 0;
2947 s->data = NULL;
2948 }
2949 }
2950
2951 void diff_free_filespec_data(struct diff_filespec *s)
2952 {
2953 diff_free_filespec_blob(s);
2954 free(s->cnt_data);
2955 s->cnt_data = NULL;
2956 }
2957
2958 static void prep_temp_blob(const char *path, struct diff_tempfile *temp,
2959 void *blob,
2960 unsigned long size,
2961 const struct object_id *oid,
2962 int mode)
2963 {
2964 int fd;
2965 struct strbuf buf = STRBUF_INIT;
2966 struct strbuf template = STRBUF_INIT;
2967 char *path_dup = xstrdup(path);
2968 const char *base = basename(path_dup);
2969
2970 /* Generate "XXXXXX_basename.ext" */
2971 strbuf_addstr(&template, "XXXXXX_");
2972 strbuf_addstr(&template, base);
2973
2974 fd = mks_tempfile_ts(&temp->tempfile, template.buf, strlen(base) + 1);
2975 if (fd < 0)
2976 die_errno("unable to create temp-file");
2977 if (convert_to_working_tree(path,
2978 (const char *)blob, (size_t)size, &buf)) {
2979 blob = buf.buf;
2980 size = buf.len;
2981 }
2982 if (write_in_full(fd, blob, size) != size)
2983 die_errno("unable to write temp-file");
2984 close_tempfile(&temp->tempfile);
2985 temp->name = get_tempfile_path(&temp->tempfile);
2986 oid_to_hex_r(temp->hex, oid);
2987 xsnprintf(temp->mode, sizeof(temp->mode), "%06o", mode);
2988 strbuf_release(&buf);
2989 strbuf_release(&template);
2990 free(path_dup);
2991 }
2992
2993 static struct diff_tempfile *prepare_temp_file(const char *name,
2994 struct diff_filespec *one)
2995 {
2996 struct diff_tempfile *temp = claim_diff_tempfile();
2997
2998 if (!DIFF_FILE_VALID(one)) {
2999 not_a_valid_file:
3000 /* A '-' entry produces this for file-2, and
3001 * a '+' entry produces this for file-1.
3002 */
3003 temp->name = "/dev/null";
3004 xsnprintf(temp->hex, sizeof(temp->hex), ".");
3005 xsnprintf(temp->mode, sizeof(temp->mode), ".");
3006 return temp;
3007 }
3008
3009 if (!S_ISGITLINK(one->mode) &&
3010 (!one->oid_valid ||
3011 reuse_worktree_file(name, one->oid.hash, 1))) {
3012 struct stat st;
3013 if (lstat(name, &st) < 0) {
3014 if (errno == ENOENT)
3015 goto not_a_valid_file;
3016 die_errno("stat(%s)", name);
3017 }
3018 if (S_ISLNK(st.st_mode)) {
3019 struct strbuf sb = STRBUF_INIT;
3020 if (strbuf_readlink(&sb, name, st.st_size) < 0)
3021 die_errno("readlink(%s)", name);
3022 prep_temp_blob(name, temp, sb.buf, sb.len,
3023 (one->oid_valid ?
3024 &one->oid : &null_oid),
3025 (one->oid_valid ?
3026 one->mode : S_IFLNK));
3027 strbuf_release(&sb);
3028 }
3029 else {
3030 /* we can borrow from the file in the work tree */
3031 temp->name = name;
3032 if (!one->oid_valid)
3033 sha1_to_hex_r(temp->hex, null_sha1);
3034 else
3035 oid_to_hex_r(temp->hex, &one->oid);
3036 /* Even though we may sometimes borrow the
3037 * contents from the work tree, we always want
3038 * one->mode. mode is trustworthy even when
3039 * !(one->sha1_valid), as long as
3040 * DIFF_FILE_VALID(one).
3041 */
3042 xsnprintf(temp->mode, sizeof(temp->mode), "%06o", one->mode);
3043 }
3044 return temp;
3045 }
3046 else {
3047 if (diff_populate_filespec(one, 0))
3048 die("cannot read data blob for %s", one->path);
3049 prep_temp_blob(name, temp, one->data, one->size,
3050 &one->oid, one->mode);
3051 }
3052 return temp;
3053 }
3054
3055 static void add_external_diff_name(struct argv_array *argv,
3056 const char *name,
3057 struct diff_filespec *df)
3058 {
3059 struct diff_tempfile *temp = prepare_temp_file(name, df);
3060 argv_array_push(argv, temp->name);
3061 argv_array_push(argv, temp->hex);
3062 argv_array_push(argv, temp->mode);
3063 }
3064
3065 /* An external diff command takes:
3066 *
3067 * diff-cmd name infile1 infile1-sha1 infile1-mode \
3068 * infile2 infile2-sha1 infile2-mode [ rename-to ]
3069 *
3070 */
3071 static void run_external_diff(const char *pgm,
3072 const char *name,
3073 const char *other,
3074 struct diff_filespec *one,
3075 struct diff_filespec *two,
3076 const char *xfrm_msg,
3077 int complete_rewrite,
3078 struct diff_options *o)
3079 {
3080 struct argv_array argv = ARGV_ARRAY_INIT;
3081 struct argv_array env = ARGV_ARRAY_INIT;
3082 struct diff_queue_struct *q = &diff_queued_diff;
3083
3084 argv_array_push(&argv, pgm);
3085 argv_array_push(&argv, name);
3086
3087 if (one && two) {
3088 add_external_diff_name(&argv, name, one);
3089 if (!other)
3090 add_external_diff_name(&argv, name, two);
3091 else {
3092 add_external_diff_name(&argv, other, two);
3093 argv_array_push(&argv, other);
3094 argv_array_push(&argv, xfrm_msg);
3095 }
3096 }
3097
3098 argv_array_pushf(&env, "GIT_DIFF_PATH_COUNTER=%d", ++o->diff_path_counter);
3099 argv_array_pushf(&env, "GIT_DIFF_PATH_TOTAL=%d", q->nr);
3100
3101 if (run_command_v_opt_cd_env(argv.argv, RUN_USING_SHELL, NULL, env.argv))
3102 die(_("external diff died, stopping at %s"), name);
3103
3104 remove_tempfile();
3105 argv_array_clear(&argv);
3106 argv_array_clear(&env);
3107 }
3108
3109 static int similarity_index(struct diff_filepair *p)
3110 {
3111 return p->score * 100 / MAX_SCORE;
3112 }
3113
3114 static const char *diff_abbrev_oid(const struct object_id *oid, int abbrev)
3115 {
3116 if (startup_info->have_repository)
3117 return find_unique_abbrev(oid->hash, abbrev);
3118 else {
3119 char *hex = oid_to_hex(oid);
3120 if (abbrev < 0)
3121 abbrev = FALLBACK_DEFAULT_ABBREV;
3122 if (abbrev > GIT_SHA1_HEXSZ)
3123 die("BUG: oid abbreviation out of range: %d", abbrev);
3124 if (abbrev)
3125 hex[abbrev] = '\0';
3126 return hex;
3127 }
3128 }
3129
3130 static void fill_metainfo(struct strbuf *msg,
3131 const char *name,
3132 const char *other,
3133 struct diff_filespec *one,
3134 struct diff_filespec *two,
3135 struct diff_options *o,
3136 struct diff_filepair *p,
3137 int *must_show_header,
3138 int use_color)
3139 {
3140 const char *set = diff_get_color(use_color, DIFF_METAINFO);
3141 const char *reset = diff_get_color(use_color, DIFF_RESET);
3142 const char *line_prefix = diff_line_prefix(o);
3143
3144 *must_show_header = 1;
3145 strbuf_init(msg, PATH_MAX * 2 + 300);
3146 switch (p->status) {
3147 case DIFF_STATUS_COPIED:
3148 strbuf_addf(msg, "%s%ssimilarity index %d%%",
3149 line_prefix, set, similarity_index(p));
3150 strbuf_addf(msg, "%s\n%s%scopy from ",
3151 reset, line_prefix, set);
3152 quote_c_style(name, msg, NULL, 0);
3153 strbuf_addf(msg, "%s\n%s%scopy to ", reset, line_prefix, set);
3154 quote_c_style(other, msg, NULL, 0);
3155 strbuf_addf(msg, "%s\n", reset);
3156 break;
3157 case DIFF_STATUS_RENAMED:
3158 strbuf_addf(msg, "%s%ssimilarity index %d%%",
3159 line_prefix, set, similarity_index(p));
3160 strbuf_addf(msg, "%s\n%s%srename from ",
3161 reset, line_prefix, set);
3162 quote_c_style(name, msg, NULL, 0);
3163 strbuf_addf(msg, "%s\n%s%srename to ",
3164 reset, line_prefix, set);
3165 quote_c_style(other, msg, NULL, 0);
3166 strbuf_addf(msg, "%s\n", reset);
3167 break;
3168 case DIFF_STATUS_MODIFIED:
3169 if (p->score) {
3170 strbuf_addf(msg, "%s%sdissimilarity index %d%%%s\n",
3171 line_prefix,
3172 set, similarity_index(p), reset);
3173 break;
3174 }
3175 /* fallthru */
3176 default:
3177 *must_show_header = 0;
3178 }
3179 if (one && two && oidcmp(&one->oid, &two->oid)) {
3180 int abbrev = DIFF_OPT_TST(o, FULL_INDEX) ? 40 : DEFAULT_ABBREV;
3181
3182 if (DIFF_OPT_TST(o, BINARY)) {
3183 mmfile_t mf;
3184 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
3185 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
3186 abbrev = 40;
3187 }
3188 strbuf_addf(msg, "%s%sindex %s..%s", line_prefix, set,
3189 diff_abbrev_oid(&one->oid, abbrev),
3190 diff_abbrev_oid(&two->oid, abbrev));
3191 if (one->mode == two->mode)
3192 strbuf_addf(msg, " %06o", one->mode);
3193 strbuf_addf(msg, "%s\n", reset);
3194 }
3195 }
3196
3197 static void run_diff_cmd(const char *pgm,
3198 const char *name,
3199 const char *other,
3200 const char *attr_path,
3201 struct diff_filespec *one,
3202 struct diff_filespec *two,
3203 struct strbuf *msg,
3204 struct diff_options *o,
3205 struct diff_filepair *p)
3206 {
3207 const char *xfrm_msg = NULL;
3208 int complete_rewrite = (p->status == DIFF_STATUS_MODIFIED) && p->score;
3209 int must_show_header = 0;
3210
3211
3212 if (DIFF_OPT_TST(o, ALLOW_EXTERNAL)) {
3213 struct userdiff_driver *drv = userdiff_find_by_path(attr_path);
3214 if (drv && drv->external)
3215 pgm = drv->external;
3216 }
3217
3218 if (msg) {
3219 /*
3220 * don't use colors when the header is intended for an
3221 * external diff driver
3222 */
3223 fill_metainfo(msg, name, other, one, two, o, p,
3224 &must_show_header,
3225 want_color(o->use_color) && !pgm);
3226 xfrm_msg = msg->len ? msg->buf : NULL;
3227 }
3228
3229 if (pgm) {
3230 run_external_diff(pgm, name, other, one, two, xfrm_msg,
3231 complete_rewrite, o);
3232 return;
3233 }
3234 if (one && two)
3235 builtin_diff(name, other ? other : name,
3236 one, two, xfrm_msg, must_show_header,
3237 o, complete_rewrite);
3238 else
3239 fprintf(o->file, "* Unmerged path %s\n", name);
3240 }
3241
3242 static void diff_fill_sha1_info(struct diff_filespec *one)
3243 {
3244 if (DIFF_FILE_VALID(one)) {
3245 if (!one->oid_valid) {
3246 struct stat st;
3247 if (one->is_stdin) {
3248 oidclr(&one->oid);
3249 return;
3250 }
3251 if (lstat(one->path, &st) < 0)
3252 die_errno("stat '%s'", one->path);
3253 if (index_path(one->oid.hash, one->path, &st, 0))
3254 die("cannot hash %s", one->path);
3255 }
3256 }
3257 else
3258 oidclr(&one->oid);
3259 }
3260
3261 static void strip_prefix(int prefix_length, const char **namep, const char **otherp)
3262 {
3263 /* Strip the prefix but do not molest /dev/null and absolute paths */
3264 if (*namep && **namep != '/') {
3265 *namep += prefix_length;
3266 if (**namep == '/')
3267 ++*namep;
3268 }
3269 if (*otherp && **otherp != '/') {
3270 *otherp += prefix_length;
3271 if (**otherp == '/')
3272 ++*otherp;
3273 }
3274 }
3275
3276 static void run_diff(struct diff_filepair *p, struct diff_options *o)
3277 {
3278 const char *pgm = external_diff();
3279 struct strbuf msg;
3280 struct diff_filespec *one = p->one;
3281 struct diff_filespec *two = p->two;
3282 const char *name;
3283 const char *other;
3284 const char *attr_path;
3285
3286 name = p->one->path;
3287 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3288 attr_path = name;
3289 if (o->prefix_length)
3290 strip_prefix(o->prefix_length, &name, &other);
3291
3292 if (!DIFF_OPT_TST(o, ALLOW_EXTERNAL))
3293 pgm = NULL;
3294
3295 if (DIFF_PAIR_UNMERGED(p)) {
3296 run_diff_cmd(pgm, name, NULL, attr_path,
3297 NULL, NULL, NULL, o, p);
3298 return;
3299 }
3300
3301 diff_fill_sha1_info(one);
3302 diff_fill_sha1_info(two);
3303
3304 if (!pgm &&
3305 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
3306 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
3307 /*
3308 * a filepair that changes between file and symlink
3309 * needs to be split into deletion and creation.
3310 */
3311 struct diff_filespec *null = alloc_filespec(two->path);
3312 run_diff_cmd(NULL, name, other, attr_path,
3313 one, null, &msg, o, p);
3314 free(null);
3315 strbuf_release(&msg);
3316
3317 null = alloc_filespec(one->path);
3318 run_diff_cmd(NULL, name, other, attr_path,
3319 null, two, &msg, o, p);
3320 free(null);
3321 }
3322 else
3323 run_diff_cmd(pgm, name, other, attr_path,
3324 one, two, &msg, o, p);
3325
3326 strbuf_release(&msg);
3327 }
3328
3329 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
3330 struct diffstat_t *diffstat)
3331 {
3332 const char *name;
3333 const char *other;
3334
3335 if (DIFF_PAIR_UNMERGED(p)) {
3336 /* unmerged */
3337 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, p);
3338 return;
3339 }
3340
3341 name = p->one->path;
3342 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3343
3344 if (o->prefix_length)
3345 strip_prefix(o->prefix_length, &name, &other);
3346
3347 diff_fill_sha1_info(p->one);
3348 diff_fill_sha1_info(p->two);
3349
3350 builtin_diffstat(name, other, p->one, p->two, diffstat, o, p);
3351 }
3352
3353 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
3354 {
3355 const char *name;
3356 const char *other;
3357 const char *attr_path;
3358
3359 if (DIFF_PAIR_UNMERGED(p)) {
3360 /* unmerged */
3361 return;
3362 }
3363
3364 name = p->one->path;
3365 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3366 attr_path = other ? other : name;
3367
3368 if (o->prefix_length)
3369 strip_prefix(o->prefix_length, &name, &other);
3370
3371 diff_fill_sha1_info(p->one);
3372 diff_fill_sha1_info(p->two);
3373
3374 builtin_checkdiff(name, other, attr_path, p->one, p->two, o);
3375 }
3376
3377 void diff_setup(struct diff_options *options)
3378 {
3379 memcpy(options, &default_diff_options, sizeof(*options));
3380
3381 options->file = stdout;
3382
3383 options->abbrev = DEFAULT_ABBREV;
3384 options->line_termination = '\n';
3385 options->break_opt = -1;
3386 options->rename_limit = -1;
3387 options->dirstat_permille = diff_dirstat_permille_default;
3388 options->context = diff_context_default;
3389 options->interhunkcontext = diff_interhunk_context_default;
3390 options->ws_error_highlight = ws_error_highlight_default;
3391 DIFF_OPT_SET(options, RENAME_EMPTY);
3392
3393 /* pathchange left =NULL by default */
3394 options->change = diff_change;
3395 options->add_remove = diff_addremove;
3396 options->use_color = diff_use_color_default;
3397 options->detect_rename = diff_detect_rename_default;
3398 options->xdl_opts |= diff_algorithm;
3399 if (diff_indent_heuristic)
3400 DIFF_XDL_SET(options, INDENT_HEURISTIC);
3401
3402 options->orderfile = diff_order_file_cfg;
3403
3404 if (diff_no_prefix) {
3405 options->a_prefix = options->b_prefix = "";
3406 } else if (!diff_mnemonic_prefix) {
3407 options->a_prefix = "a/";
3408 options->b_prefix = "b/";
3409 }
3410 }
3411
3412 void diff_setup_done(struct diff_options *options)
3413 {
3414 int count = 0;
3415
3416 if (options->set_default)
3417 options->set_default(options);
3418
3419 if (options->output_format & DIFF_FORMAT_NAME)
3420 count++;
3421 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
3422 count++;
3423 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
3424 count++;
3425 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
3426 count++;
3427 if (count > 1)
3428 die(_("--name-only, --name-status, --check and -s are mutually exclusive"));
3429
3430 /*
3431 * Most of the time we can say "there are changes"
3432 * only by checking if there are changed paths, but
3433 * --ignore-whitespace* options force us to look
3434 * inside contents.
3435 */
3436
3437 if (DIFF_XDL_TST(options, IGNORE_WHITESPACE) ||
3438 DIFF_XDL_TST(options, IGNORE_WHITESPACE_CHANGE) ||
3439 DIFF_XDL_TST(options, IGNORE_WHITESPACE_AT_EOL))
3440 DIFF_OPT_SET(options, DIFF_FROM_CONTENTS);
3441 else
3442 DIFF_OPT_CLR(options, DIFF_FROM_CONTENTS);
3443
3444 if (DIFF_OPT_TST(options, FIND_COPIES_HARDER))
3445 options->detect_rename = DIFF_DETECT_COPY;
3446
3447 if (!DIFF_OPT_TST(options, RELATIVE_NAME))
3448 options->prefix = NULL;
3449 if (options->prefix)
3450 options->prefix_length = strlen(options->prefix);
3451 else
3452 options->prefix_length = 0;
3453
3454 if (options->output_format & (DIFF_FORMAT_NAME |
3455 DIFF_FORMAT_NAME_STATUS |
3456 DIFF_FORMAT_CHECKDIFF |
3457 DIFF_FORMAT_NO_OUTPUT))
3458 options->output_format &= ~(DIFF_FORMAT_RAW |
3459 DIFF_FORMAT_NUMSTAT |
3460 DIFF_FORMAT_DIFFSTAT |
3461 DIFF_FORMAT_SHORTSTAT |
3462 DIFF_FORMAT_DIRSTAT |
3463 DIFF_FORMAT_SUMMARY |
3464 DIFF_FORMAT_PATCH);
3465
3466 /*
3467 * These cases always need recursive; we do not drop caller-supplied
3468 * recursive bits for other formats here.
3469 */
3470 if (options->output_format & (DIFF_FORMAT_PATCH |
3471 DIFF_FORMAT_NUMSTAT |
3472 DIFF_FORMAT_DIFFSTAT |
3473 DIFF_FORMAT_SHORTSTAT |
3474 DIFF_FORMAT_DIRSTAT |
3475 DIFF_FORMAT_SUMMARY |
3476 DIFF_FORMAT_CHECKDIFF))
3477 DIFF_OPT_SET(options, RECURSIVE);
3478 /*
3479 * Also pickaxe would not work very well if you do not say recursive
3480 */
3481 if (options->pickaxe)
3482 DIFF_OPT_SET(options, RECURSIVE);
3483 /*
3484 * When patches are generated, submodules diffed against the work tree
3485 * must be checked for dirtiness too so it can be shown in the output
3486 */
3487 if (options->output_format & DIFF_FORMAT_PATCH)
3488 DIFF_OPT_SET(options, DIRTY_SUBMODULES);
3489
3490 if (options->detect_rename && options->rename_limit < 0)
3491 options->rename_limit = diff_rename_limit_default;
3492 if (options->setup & DIFF_SETUP_USE_CACHE) {
3493 if (!active_cache)
3494 /* read-cache does not die even when it fails
3495 * so it is safe for us to do this here. Also
3496 * it does not smudge active_cache or active_nr
3497 * when it fails, so we do not have to worry about
3498 * cleaning it up ourselves either.
3499 */
3500 read_cache();
3501 }
3502 if (40 < options->abbrev)
3503 options->abbrev = 40; /* full */
3504
3505 /*
3506 * It does not make sense to show the first hit we happened
3507 * to have found. It does not make sense not to return with
3508 * exit code in such a case either.
3509 */
3510 if (DIFF_OPT_TST(options, QUICK)) {
3511 options->output_format = DIFF_FORMAT_NO_OUTPUT;
3512 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
3513 }
3514
3515 options->diff_path_counter = 0;
3516
3517 if (DIFF_OPT_TST(options, FOLLOW_RENAMES) && options->pathspec.nr != 1)
3518 die(_("--follow requires exactly one pathspec"));
3519 }
3520
3521 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
3522 {
3523 char c, *eq;
3524 int len;
3525
3526 if (*arg != '-')
3527 return 0;
3528 c = *++arg;
3529 if (!c)
3530 return 0;
3531 if (c == arg_short) {
3532 c = *++arg;
3533 if (!c)
3534 return 1;
3535 if (val && isdigit(c)) {
3536 char *end;
3537 int n = strtoul(arg, &end, 10);
3538 if (*end)
3539 return 0;
3540 *val = n;
3541 return 1;
3542 }
3543 return 0;
3544 }
3545 if (c != '-')
3546 return 0;
3547 arg++;
3548 eq = strchrnul(arg, '=');
3549 len = eq - arg;
3550 if (!len || strncmp(arg, arg_long, len))
3551 return 0;
3552 if (*eq) {
3553 int n;
3554 char *end;
3555 if (!isdigit(*++eq))
3556 return 0;
3557 n = strtoul(eq, &end, 10);
3558 if (*end)
3559 return 0;
3560 *val = n;
3561 }
3562 return 1;
3563 }
3564
3565 static int diff_scoreopt_parse(const char *opt);
3566
3567 static inline int short_opt(char opt, const char **argv,
3568 const char **optarg)
3569 {
3570 const char *arg = argv[0];
3571 if (arg[0] != '-' || arg[1] != opt)
3572 return 0;
3573 if (arg[2] != '\0') {
3574 *optarg = arg + 2;
3575 return 1;
3576 }
3577 if (!argv[1])
3578 die("Option '%c' requires a value", opt);
3579 *optarg = argv[1];
3580 return 2;
3581 }
3582
3583 int parse_long_opt(const char *opt, const char **argv,
3584 const char **optarg)
3585 {
3586 const char *arg = argv[0];
3587 if (!skip_prefix(arg, "--", &arg))
3588 return 0;
3589 if (!skip_prefix(arg, opt, &arg))
3590 return 0;
3591 if (*arg == '=') { /* stuck form: --option=value */
3592 *optarg = arg + 1;
3593 return 1;
3594 }
3595 if (*arg != '\0')
3596 return 0;
3597 /* separate form: --option value */
3598 if (!argv[1])
3599 die("Option '--%s' requires a value", opt);
3600 *optarg = argv[1];
3601 return 2;
3602 }
3603
3604 static int stat_opt(struct diff_options *options, const char **av)
3605 {
3606 const char *arg = av[0];
3607 char *end;
3608 int width = options->stat_width;
3609 int name_width = options->stat_name_width;
3610 int graph_width = options->stat_graph_width;
3611 int count = options->stat_count;
3612 int argcount = 1;
3613
3614 if (!skip_prefix(arg, "--stat", &arg))
3615 die("BUG: stat option does not begin with --stat: %s", arg);
3616 end = (char *)arg;
3617
3618 switch (*arg) {
3619 case '-':
3620 if (skip_prefix(arg, "-width", &arg)) {
3621 if (*arg == '=')
3622 width = strtoul(arg + 1, &end, 10);
3623 else if (!*arg && !av[1])
3624 die_want_option("--stat-width");
3625 else if (!*arg) {
3626 width = strtoul(av[1], &end, 10);
3627 argcount = 2;
3628 }
3629 } else if (skip_prefix(arg, "-name-width", &arg)) {
3630 if (*arg == '=')
3631 name_width = strtoul(arg + 1, &end, 10);
3632 else if (!*arg && !av[1])
3633 die_want_option("--stat-name-width");
3634 else if (!*arg) {
3635 name_width = strtoul(av[1], &end, 10);
3636 argcount = 2;
3637 }
3638 } else if (skip_prefix(arg, "-graph-width", &arg)) {
3639 if (*arg == '=')
3640 graph_width = strtoul(arg + 1, &end, 10);
3641 else if (!*arg && !av[1])
3642 die_want_option("--stat-graph-width");
3643 else if (!*arg) {
3644 graph_width = strtoul(av[1], &end, 10);
3645 argcount = 2;
3646 }
3647 } else if (skip_prefix(arg, "-count", &arg)) {
3648 if (*arg == '=')
3649 count = strtoul(arg + 1, &end, 10);
3650 else if (!*arg && !av[1])
3651 die_want_option("--stat-count");
3652 else if (!*arg) {
3653 count = strtoul(av[1], &end, 10);
3654 argcount = 2;
3655 }
3656 }
3657 break;
3658 case '=':
3659 width = strtoul(arg+1, &end, 10);
3660 if (*end == ',')
3661 name_width = strtoul(end+1, &end, 10);
3662 if (*end == ',')
3663 count = strtoul(end+1, &end, 10);
3664 }
3665
3666 /* Important! This checks all the error cases! */
3667 if (*end)
3668 return 0;
3669 options->output_format |= DIFF_FORMAT_DIFFSTAT;
3670 options->stat_name_width = name_width;
3671 options->stat_graph_width = graph_width;
3672 options->stat_width = width;
3673 options->stat_count = count;
3674 return argcount;
3675 }
3676
3677 static int parse_dirstat_opt(struct diff_options *options, const char *params)
3678 {
3679 struct strbuf errmsg = STRBUF_INIT;
3680 if (parse_dirstat_params(options, params, &errmsg))
3681 die(_("Failed to parse --dirstat/-X option parameter:\n%s"),
3682 errmsg.buf);
3683 strbuf_release(&errmsg);
3684 /*
3685 * The caller knows a dirstat-related option is given from the command
3686 * line; allow it to say "return this_function();"
3687 */
3688 options->output_format |= DIFF_FORMAT_DIRSTAT;
3689 return 1;
3690 }
3691
3692 static int parse_submodule_opt(struct diff_options *options, const char *value)
3693 {
3694 if (parse_submodule_params(options, value))
3695 die(_("Failed to parse --submodule option parameter: '%s'"),
3696 value);
3697 return 1;
3698 }
3699
3700 static const char diff_status_letters[] = {
3701 DIFF_STATUS_ADDED,
3702 DIFF_STATUS_COPIED,
3703 DIFF_STATUS_DELETED,
3704 DIFF_STATUS_MODIFIED,
3705 DIFF_STATUS_RENAMED,
3706 DIFF_STATUS_TYPE_CHANGED,
3707 DIFF_STATUS_UNKNOWN,
3708 DIFF_STATUS_UNMERGED,
3709 DIFF_STATUS_FILTER_AON,
3710 DIFF_STATUS_FILTER_BROKEN,
3711 '\0',
3712 };
3713
3714 static unsigned int filter_bit['Z' + 1];
3715
3716 static void prepare_filter_bits(void)
3717 {
3718 int i;
3719
3720 if (!filter_bit[DIFF_STATUS_ADDED]) {
3721 for (i = 0; diff_status_letters[i]; i++)
3722 filter_bit[(int) diff_status_letters[i]] = (1 << i);
3723 }
3724 }
3725
3726 static unsigned filter_bit_tst(char status, const struct diff_options *opt)
3727 {
3728 return opt->filter & filter_bit[(int) status];
3729 }
3730
3731 static int parse_diff_filter_opt(const char *optarg, struct diff_options *opt)
3732 {
3733 int i, optch;
3734
3735 prepare_filter_bits();
3736
3737 /*
3738 * If there is a negation e.g. 'd' in the input, and we haven't
3739 * initialized the filter field with another --diff-filter, start
3740 * from full set of bits, except for AON.
3741 */
3742 if (!opt->filter) {
3743 for (i = 0; (optch = optarg[i]) != '\0'; i++) {
3744 if (optch < 'a' || 'z' < optch)
3745 continue;
3746 opt->filter = (1 << (ARRAY_SIZE(diff_status_letters) - 1)) - 1;
3747 opt->filter &= ~filter_bit[DIFF_STATUS_FILTER_AON];
3748 break;
3749 }
3750 }
3751
3752 for (i = 0; (optch = optarg[i]) != '\0'; i++) {
3753 unsigned int bit;
3754 int negate;
3755
3756 if ('a' <= optch && optch <= 'z') {
3757 negate = 1;
3758 optch = toupper(optch);
3759 } else {
3760 negate = 0;
3761 }
3762
3763 bit = (0 <= optch && optch <= 'Z') ? filter_bit[optch] : 0;
3764 if (!bit)
3765 return optarg[i];
3766 if (negate)
3767 opt->filter &= ~bit;
3768 else
3769 opt->filter |= bit;
3770 }
3771 return 0;
3772 }
3773
3774 static void enable_patch_output(int *fmt) {
3775 *fmt &= ~DIFF_FORMAT_NO_OUTPUT;
3776 *fmt |= DIFF_FORMAT_PATCH;
3777 }
3778
3779 static int parse_ws_error_highlight_opt(struct diff_options *opt, const char *arg)
3780 {
3781 int val = parse_ws_error_highlight(arg);
3782
3783 if (val < 0) {
3784 error("unknown value after ws-error-highlight=%.*s",
3785 -1 - val, arg);
3786 return 0;
3787 }
3788 opt->ws_error_highlight = val;
3789 return 1;
3790 }
3791
3792 int diff_opt_parse(struct diff_options *options,
3793 const char **av, int ac, const char *prefix)
3794 {
3795 const char *arg = av[0];
3796 const char *optarg;
3797 int argcount;
3798
3799 if (!prefix)
3800 prefix = "";
3801
3802 /* Output format options */
3803 if (!strcmp(arg, "-p") || !strcmp(arg, "-u") || !strcmp(arg, "--patch")
3804 || opt_arg(arg, 'U', "unified", &options->context))
3805 enable_patch_output(&options->output_format);
3806 else if (!strcmp(arg, "--raw"))
3807 options->output_format |= DIFF_FORMAT_RAW;
3808 else if (!strcmp(arg, "--patch-with-raw")) {
3809 enable_patch_output(&options->output_format);
3810 options->output_format |= DIFF_FORMAT_RAW;
3811 } else if (!strcmp(arg, "--numstat"))
3812 options->output_format |= DIFF_FORMAT_NUMSTAT;
3813 else if (!strcmp(arg, "--shortstat"))
3814 options->output_format |= DIFF_FORMAT_SHORTSTAT;
3815 else if (!strcmp(arg, "-X") || !strcmp(arg, "--dirstat"))
3816 return parse_dirstat_opt(options, "");
3817 else if (skip_prefix(arg, "-X", &arg))
3818 return parse_dirstat_opt(options, arg);
3819 else if (skip_prefix(arg, "--dirstat=", &arg))
3820 return parse_dirstat_opt(options, arg);
3821 else if (!strcmp(arg, "--cumulative"))
3822 return parse_dirstat_opt(options, "cumulative");
3823 else if (!strcmp(arg, "--dirstat-by-file"))
3824 return parse_dirstat_opt(options, "files");
3825 else if (skip_prefix(arg, "--dirstat-by-file=", &arg)) {
3826 parse_dirstat_opt(options, "files");
3827 return parse_dirstat_opt(options, arg);
3828 }
3829 else if (!strcmp(arg, "--check"))
3830 options->output_format |= DIFF_FORMAT_CHECKDIFF;
3831 else if (!strcmp(arg, "--summary"))
3832 options->output_format |= DIFF_FORMAT_SUMMARY;
3833 else if (!strcmp(arg, "--patch-with-stat")) {
3834 enable_patch_output(&options->output_format);
3835 options->output_format |= DIFF_FORMAT_DIFFSTAT;
3836 } else if (!strcmp(arg, "--name-only"))
3837 options->output_format |= DIFF_FORMAT_NAME;
3838 else if (!strcmp(arg, "--name-status"))
3839 options->output_format |= DIFF_FORMAT_NAME_STATUS;
3840 else if (!strcmp(arg, "-s") || !strcmp(arg, "--no-patch"))
3841 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
3842 else if (starts_with(arg, "--stat"))
3843 /* --stat, --stat-width, --stat-name-width, or --stat-count */
3844 return stat_opt(options, av);
3845
3846 /* renames options */
3847 else if (starts_with(arg, "-B") || starts_with(arg, "--break-rewrites=") ||
3848 !strcmp(arg, "--break-rewrites")) {
3849 if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
3850 return error("invalid argument to -B: %s", arg+2);
3851 }
3852 else if (starts_with(arg, "-M") || starts_with(arg, "--find-renames=") ||
3853 !strcmp(arg, "--find-renames")) {
3854 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
3855 return error("invalid argument to -M: %s", arg+2);
3856 options->detect_rename = DIFF_DETECT_RENAME;
3857 }
3858 else if (!strcmp(arg, "-D") || !strcmp(arg, "--irreversible-delete")) {
3859 options->irreversible_delete = 1;
3860 }
3861 else if (starts_with(arg, "-C") || starts_with(arg, "--find-copies=") ||
3862 !strcmp(arg, "--find-copies")) {
3863 if (options->detect_rename == DIFF_DETECT_COPY)
3864 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3865 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
3866 return error("invalid argument to -C: %s", arg+2);
3867 options->detect_rename = DIFF_DETECT_COPY;
3868 }
3869 else if (!strcmp(arg, "--no-renames"))
3870 options->detect_rename = 0;
3871 else if (!strcmp(arg, "--rename-empty"))
3872 DIFF_OPT_SET(options, RENAME_EMPTY);
3873 else if (!strcmp(arg, "--no-rename-empty"))
3874 DIFF_OPT_CLR(options, RENAME_EMPTY);
3875 else if (!strcmp(arg, "--relative"))
3876 DIFF_OPT_SET(options, RELATIVE_NAME);
3877 else if (skip_prefix(arg, "--relative=", &arg)) {
3878 DIFF_OPT_SET(options, RELATIVE_NAME);
3879 options->prefix = arg;
3880 }
3881
3882 /* xdiff options */
3883 else if (!strcmp(arg, "--minimal"))
3884 DIFF_XDL_SET(options, NEED_MINIMAL);
3885 else if (!strcmp(arg, "--no-minimal"))
3886 DIFF_XDL_CLR(options, NEED_MINIMAL);
3887 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
3888 DIFF_XDL_SET(options, IGNORE_WHITESPACE);
3889 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
3890 DIFF_XDL_SET(options, IGNORE_WHITESPACE_CHANGE);
3891 else if (!strcmp(arg, "--ignore-space-at-eol"))
3892 DIFF_XDL_SET(options, IGNORE_WHITESPACE_AT_EOL);
3893 else if (!strcmp(arg, "--ignore-blank-lines"))
3894 DIFF_XDL_SET(options, IGNORE_BLANK_LINES);
3895 else if (!strcmp(arg, "--indent-heuristic"))
3896 DIFF_XDL_SET(options, INDENT_HEURISTIC);
3897 else if (!strcmp(arg, "--no-indent-heuristic"))
3898 DIFF_XDL_CLR(options, INDENT_HEURISTIC);
3899 else if (!strcmp(arg, "--patience"))
3900 options->xdl_opts = DIFF_WITH_ALG(options, PATIENCE_DIFF);
3901 else if (!strcmp(arg, "--histogram"))
3902 options->xdl_opts = DIFF_WITH_ALG(options, HISTOGRAM_DIFF);
3903 else if ((argcount = parse_long_opt("diff-algorithm", av, &optarg))) {
3904 long value = parse_algorithm_value(optarg);
3905 if (value < 0)
3906 return error("option diff-algorithm accepts \"myers\", "
3907 "\"minimal\", \"patience\" and \"histogram\"");
3908 /* clear out previous settings */
3909 DIFF_XDL_CLR(options, NEED_MINIMAL);
3910 options->xdl_opts &= ~XDF_DIFF_ALGORITHM_MASK;
3911 options->xdl_opts |= value;
3912 return argcount;
3913 }
3914
3915 /* flags options */
3916 else if (!strcmp(arg, "--binary")) {
3917 enable_patch_output(&options->output_format);
3918 DIFF_OPT_SET(options, BINARY);
3919 }
3920 else if (!strcmp(arg, "--full-index"))
3921 DIFF_OPT_SET(options, FULL_INDEX);
3922 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
3923 DIFF_OPT_SET(options, TEXT);
3924 else if (!strcmp(arg, "-R"))
3925 DIFF_OPT_SET(options, REVERSE_DIFF);
3926 else if (!strcmp(arg, "--find-copies-harder"))
3927 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3928 else if (!strcmp(arg, "--follow"))
3929 DIFF_OPT_SET(options, FOLLOW_RENAMES);
3930 else if (!strcmp(arg, "--no-follow")) {
3931 DIFF_OPT_CLR(options, FOLLOW_RENAMES);
3932 DIFF_OPT_CLR(options, DEFAULT_FOLLOW_RENAMES);
3933 } else if (!strcmp(arg, "--color"))
3934 options->use_color = 1;
3935 else if (skip_prefix(arg, "--color=", &arg)) {
3936 int value = git_config_colorbool(NULL, arg);
3937 if (value < 0)
3938 return error("option `color' expects \"always\", \"auto\", or \"never\"");
3939 options->use_color = value;
3940 }
3941 else if (!strcmp(arg, "--no-color"))
3942 options->use_color = 0;
3943 else if (!strcmp(arg, "--color-words")) {
3944 options->use_color = 1;
3945 options->word_diff = DIFF_WORDS_COLOR;
3946 }
3947 else if (skip_prefix(arg, "--color-words=", &arg)) {
3948 options->use_color = 1;
3949 options->word_diff = DIFF_WORDS_COLOR;
3950 options->word_regex = arg;
3951 }
3952 else if (!strcmp(arg, "--word-diff")) {
3953 if (options->word_diff == DIFF_WORDS_NONE)
3954 options->word_diff = DIFF_WORDS_PLAIN;
3955 }
3956 else if (skip_prefix(arg, "--word-diff=", &arg)) {
3957 if (!strcmp(arg, "plain"))
3958 options->word_diff = DIFF_WORDS_PLAIN;
3959 else if (!strcmp(arg, "color")) {
3960 options->use_color = 1;
3961 options->word_diff = DIFF_WORDS_COLOR;
3962 }
3963 else if (!strcmp(arg, "porcelain"))
3964 options->word_diff = DIFF_WORDS_PORCELAIN;
3965 else if (!strcmp(arg, "none"))
3966 options->word_diff = DIFF_WORDS_NONE;
3967 else
3968 die("bad --word-diff argument: %s", arg);
3969 }
3970 else if ((argcount = parse_long_opt("word-diff-regex", av, &optarg))) {
3971 if (options->word_diff == DIFF_WORDS_NONE)
3972 options->word_diff = DIFF_WORDS_PLAIN;
3973 options->word_regex = optarg;
3974 return argcount;
3975 }
3976 else if (!strcmp(arg, "--exit-code"))
3977 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
3978 else if (!strcmp(arg, "--quiet"))
3979 DIFF_OPT_SET(options, QUICK);
3980 else if (!strcmp(arg, "--ext-diff"))
3981 DIFF_OPT_SET(options, ALLOW_EXTERNAL);
3982 else if (!strcmp(arg, "--no-ext-diff"))
3983 DIFF_OPT_CLR(options, ALLOW_EXTERNAL);
3984 else if (!strcmp(arg, "--textconv"))
3985 DIFF_OPT_SET(options, ALLOW_TEXTCONV);
3986 else if (!strcmp(arg, "--no-textconv"))
3987 DIFF_OPT_CLR(options, ALLOW_TEXTCONV);
3988 else if (!strcmp(arg, "--ignore-submodules")) {
3989 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
3990 handle_ignore_submodules_arg(options, "all");
3991 } else if (skip_prefix(arg, "--ignore-submodules=", &arg)) {
3992 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
3993 handle_ignore_submodules_arg(options, arg);
3994 } else if (!strcmp(arg, "--submodule"))
3995 options->submodule_format = DIFF_SUBMODULE_LOG;
3996 else if (skip_prefix(arg, "--submodule=", &arg))
3997 return parse_submodule_opt(options, arg);
3998 else if (skip_prefix(arg, "--ws-error-highlight=", &arg))
3999 return parse_ws_error_highlight_opt(options, arg);
4000 else if (!strcmp(arg, "--ita-invisible-in-index"))
4001 options->ita_invisible_in_index = 1;
4002 else if (!strcmp(arg, "--ita-visible-in-index"))
4003 options->ita_invisible_in_index = 0;
4004
4005 /* misc options */
4006 else if (!strcmp(arg, "-z"))
4007 options->line_termination = 0;
4008 else if ((argcount = short_opt('l', av, &optarg))) {
4009 options->rename_limit = strtoul(optarg, NULL, 10);
4010 return argcount;
4011 }
4012 else if ((argcount = short_opt('S', av, &optarg))) {
4013 options->pickaxe = optarg;
4014 options->pickaxe_opts |= DIFF_PICKAXE_KIND_S;
4015 return argcount;
4016 } else if ((argcount = short_opt('G', av, &optarg))) {
4017 options->pickaxe = optarg;
4018 options->pickaxe_opts |= DIFF_PICKAXE_KIND_G;
4019 return argcount;
4020 }
4021 else if (!strcmp(arg, "--pickaxe-all"))
4022 options->pickaxe_opts |= DIFF_PICKAXE_ALL;
4023 else if (!strcmp(arg, "--pickaxe-regex"))
4024 options->pickaxe_opts |= DIFF_PICKAXE_REGEX;
4025 else if ((argcount = short_opt('O', av, &optarg))) {
4026 options->orderfile = prefix_filename(prefix, optarg);
4027 return argcount;
4028 }
4029 else if ((argcount = parse_long_opt("diff-filter", av, &optarg))) {
4030 int offending = parse_diff_filter_opt(optarg, options);
4031 if (offending)
4032 die("unknown change class '%c' in --diff-filter=%s",
4033 offending, optarg);
4034 return argcount;
4035 }
4036 else if (!strcmp(arg, "--no-abbrev"))
4037 options->abbrev = 0;
4038 else if (!strcmp(arg, "--abbrev"))
4039 options->abbrev = DEFAULT_ABBREV;
4040 else if (skip_prefix(arg, "--abbrev=", &arg)) {
4041 options->abbrev = strtoul(arg, NULL, 10);
4042 if (options->abbrev < MINIMUM_ABBREV)
4043 options->abbrev = MINIMUM_ABBREV;
4044 else if (40 < options->abbrev)
4045 options->abbrev = 40;
4046 }
4047 else if ((argcount = parse_long_opt("src-prefix", av, &optarg))) {
4048 options->a_prefix = optarg;
4049 return argcount;
4050 }
4051 else if ((argcount = parse_long_opt("line-prefix", av, &optarg))) {
4052 options->line_prefix = optarg;
4053 options->line_prefix_length = strlen(options->line_prefix);
4054 graph_setup_line_prefix(options);
4055 return argcount;
4056 }
4057 else if ((argcount = parse_long_opt("dst-prefix", av, &optarg))) {
4058 options->b_prefix = optarg;
4059 return argcount;
4060 }
4061 else if (!strcmp(arg, "--no-prefix"))
4062 options->a_prefix = options->b_prefix = "";
4063 else if (opt_arg(arg, '\0', "inter-hunk-context",
4064 &options->interhunkcontext))
4065 ;
4066 else if (!strcmp(arg, "-W"))
4067 DIFF_OPT_SET(options, FUNCCONTEXT);
4068 else if (!strcmp(arg, "--function-context"))
4069 DIFF_OPT_SET(options, FUNCCONTEXT);
4070 else if (!strcmp(arg, "--no-function-context"))
4071 DIFF_OPT_CLR(options, FUNCCONTEXT);
4072 else if ((argcount = parse_long_opt("output", av, &optarg))) {
4073 char *path = prefix_filename(prefix, optarg);
4074 options->file = fopen(path, "w");
4075 if (!options->file)
4076 die_errno("Could not open '%s'", path);
4077 options->close_file = 1;
4078 if (options->use_color != GIT_COLOR_ALWAYS)
4079 options->use_color = GIT_COLOR_NEVER;
4080 free(path);
4081 return argcount;
4082 } else
4083 return 0;
4084 return 1;
4085 }
4086
4087 int parse_rename_score(const char **cp_p)
4088 {
4089 unsigned long num, scale;
4090 int ch, dot;
4091 const char *cp = *cp_p;
4092
4093 num = 0;
4094 scale = 1;
4095 dot = 0;
4096 for (;;) {
4097 ch = *cp;
4098 if ( !dot && ch == '.' ) {
4099 scale = 1;
4100 dot = 1;
4101 } else if ( ch == '%' ) {
4102 scale = dot ? scale*100 : 100;
4103 cp++; /* % is always at the end */
4104 break;
4105 } else if ( ch >= '0' && ch <= '9' ) {
4106 if ( scale < 100000 ) {
4107 scale *= 10;
4108 num = (num*10) + (ch-'0');
4109 }
4110 } else {
4111 break;
4112 }
4113 cp++;
4114 }
4115 *cp_p = cp;
4116
4117 /* user says num divided by scale and we say internally that
4118 * is MAX_SCORE * num / scale.
4119 */
4120 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
4121 }
4122
4123 static int diff_scoreopt_parse(const char *opt)
4124 {
4125 int opt1, opt2, cmd;
4126
4127 if (*opt++ != '-')
4128 return -1;
4129 cmd = *opt++;
4130 if (cmd == '-') {
4131 /* convert the long-form arguments into short-form versions */
4132 if (skip_prefix(opt, "break-rewrites", &opt)) {
4133 if (*opt == 0 || *opt++ == '=')
4134 cmd = 'B';
4135 } else if (skip_prefix(opt, "find-copies", &opt)) {
4136 if (*opt == 0 || *opt++ == '=')
4137 cmd = 'C';
4138 } else if (skip_prefix(opt, "find-renames", &opt)) {
4139 if (*opt == 0 || *opt++ == '=')
4140 cmd = 'M';
4141 }
4142 }
4143 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
4144 return -1; /* that is not a -M, -C, or -B option */
4145
4146 opt1 = parse_rename_score(&opt);
4147 if (cmd != 'B')
4148 opt2 = 0;
4149 else {
4150 if (*opt == 0)
4151 opt2 = 0;
4152 else if (*opt != '/')
4153 return -1; /* we expect -B80/99 or -B80 */
4154 else {
4155 opt++;
4156 opt2 = parse_rename_score(&opt);
4157 }
4158 }
4159 if (*opt != 0)
4160 return -1;
4161 return opt1 | (opt2 << 16);
4162 }
4163
4164 struct diff_queue_struct diff_queued_diff;
4165
4166 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
4167 {
4168 ALLOC_GROW(queue->queue, queue->nr + 1, queue->alloc);
4169 queue->queue[queue->nr++] = dp;
4170 }
4171
4172 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
4173 struct diff_filespec *one,
4174 struct diff_filespec *two)
4175 {
4176 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
4177 dp->one = one;
4178 dp->two = two;
4179 if (queue)
4180 diff_q(queue, dp);
4181 return dp;
4182 }
4183
4184 void diff_free_filepair(struct diff_filepair *p)
4185 {
4186 free_filespec(p->one);
4187 free_filespec(p->two);
4188 free(p);
4189 }
4190
4191 const char *diff_aligned_abbrev(const struct object_id *oid, int len)
4192 {
4193 int abblen;
4194 const char *abbrev;
4195
4196 if (len == GIT_SHA1_HEXSZ)
4197 return oid_to_hex(oid);
4198
4199 abbrev = diff_abbrev_oid(oid, len);
4200 abblen = strlen(abbrev);
4201
4202 /*
4203 * In well-behaved cases, where the abbbreviated result is the
4204 * same as the requested length, append three dots after the
4205 * abbreviation (hence the whole logic is limited to the case
4206 * where abblen < 37); when the actual abbreviated result is a
4207 * bit longer than the requested length, we reduce the number
4208 * of dots so that they match the well-behaved ones. However,
4209 * if the actual abbreviation is longer than the requested
4210 * length by more than three, we give up on aligning, and add
4211 * three dots anyway, to indicate that the output is not the
4212 * full object name. Yes, this may be suboptimal, but this
4213 * appears only in "diff --raw --abbrev" output and it is not
4214 * worth the effort to change it now. Note that this would
4215 * likely to work fine when the automatic sizing of default
4216 * abbreviation length is used--we would be fed -1 in "len" in
4217 * that case, and will end up always appending three-dots, but
4218 * the automatic sizing is supposed to give abblen that ensures
4219 * uniqueness across all objects (statistically speaking).
4220 */
4221 if (abblen < GIT_SHA1_HEXSZ - 3) {
4222 static char hex[GIT_MAX_HEXSZ + 1];
4223 if (len < abblen && abblen <= len + 2)
4224 xsnprintf(hex, sizeof(hex), "%s%.*s", abbrev, len+3-abblen, "..");
4225 else
4226 xsnprintf(hex, sizeof(hex), "%s...", abbrev);
4227 return hex;
4228 }
4229
4230 return oid_to_hex(oid);
4231 }
4232
4233 static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
4234 {
4235 int line_termination = opt->line_termination;
4236 int inter_name_termination = line_termination ? '\t' : '\0';
4237
4238 fprintf(opt->file, "%s", diff_line_prefix(opt));
4239 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
4240 fprintf(opt->file, ":%06o %06o %s ", p->one->mode, p->two->mode,
4241 diff_aligned_abbrev(&p->one->oid, opt->abbrev));
4242 fprintf(opt->file, "%s ",
4243 diff_aligned_abbrev(&p->two->oid, opt->abbrev));
4244 }
4245 if (p->score) {
4246 fprintf(opt->file, "%c%03d%c", p->status, similarity_index(p),
4247 inter_name_termination);
4248 } else {
4249 fprintf(opt->file, "%c%c", p->status, inter_name_termination);
4250 }
4251
4252 if (p->status == DIFF_STATUS_COPIED ||
4253 p->status == DIFF_STATUS_RENAMED) {
4254 const char *name_a, *name_b;
4255 name_a = p->one->path;
4256 name_b = p->two->path;
4257 strip_prefix(opt->prefix_length, &name_a, &name_b);
4258 write_name_quoted(name_a, opt->file, inter_name_termination);
4259 write_name_quoted(name_b, opt->file, line_termination);
4260 } else {
4261 const char *name_a, *name_b;
4262 name_a = p->one->mode ? p->one->path : p->two->path;
4263 name_b = NULL;
4264 strip_prefix(opt->prefix_length, &name_a, &name_b);
4265 write_name_quoted(name_a, opt->file, line_termination);
4266 }
4267 }
4268
4269 int diff_unmodified_pair(struct diff_filepair *p)
4270 {
4271 /* This function is written stricter than necessary to support
4272 * the currently implemented transformers, but the idea is to
4273 * let transformers to produce diff_filepairs any way they want,
4274 * and filter and clean them up here before producing the output.
4275 */
4276 struct diff_filespec *one = p->one, *two = p->two;
4277
4278 if (DIFF_PAIR_UNMERGED(p))
4279 return 0; /* unmerged is interesting */
4280
4281 /* deletion, addition, mode or type change
4282 * and rename are all interesting.
4283 */
4284 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
4285 DIFF_PAIR_MODE_CHANGED(p) ||
4286 strcmp(one->path, two->path))
4287 return 0;
4288
4289 /* both are valid and point at the same path. that is, we are
4290 * dealing with a change.
4291 */
4292 if (one->oid_valid && two->oid_valid &&
4293 !oidcmp(&one->oid, &two->oid) &&
4294 !one->dirty_submodule && !two->dirty_submodule)
4295 return 1; /* no change */
4296 if (!one->oid_valid && !two->oid_valid)
4297 return 1; /* both look at the same file on the filesystem. */
4298 return 0;
4299 }
4300
4301 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
4302 {
4303 if (diff_unmodified_pair(p))
4304 return;
4305
4306 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4307 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4308 return; /* no tree diffs in patch format */
4309
4310 run_diff(p, o);
4311 }
4312
4313 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
4314 struct diffstat_t *diffstat)
4315 {
4316 if (diff_unmodified_pair(p))
4317 return;
4318
4319 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4320 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4321 return; /* no useful stat for tree diffs */
4322
4323 run_diffstat(p, o, diffstat);
4324 }
4325
4326 static void diff_flush_checkdiff(struct diff_filepair *p,
4327 struct diff_options *o)
4328 {
4329 if (diff_unmodified_pair(p))
4330 return;
4331
4332 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4333 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4334 return; /* nothing to check in tree diffs */
4335
4336 run_checkdiff(p, o);
4337 }
4338
4339 int diff_queue_is_empty(void)
4340 {
4341 struct diff_queue_struct *q = &diff_queued_diff;
4342 int i;
4343 for (i = 0; i < q->nr; i++)
4344 if (!diff_unmodified_pair(q->queue[i]))
4345 return 0;
4346 return 1;
4347 }
4348
4349 #if DIFF_DEBUG
4350 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
4351 {
4352 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
4353 x, one ? one : "",
4354 s->path,
4355 DIFF_FILE_VALID(s) ? "valid" : "invalid",
4356 s->mode,
4357 s->oid_valid ? oid_to_hex(&s->oid) : "");
4358 fprintf(stderr, "queue[%d] %s size %lu\n",
4359 x, one ? one : "",
4360 s->size);
4361 }
4362
4363 void diff_debug_filepair(const struct diff_filepair *p, int i)
4364 {
4365 diff_debug_filespec(p->one, i, "one");
4366 diff_debug_filespec(p->two, i, "two");
4367 fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
4368 p->score, p->status ? p->status : '?',
4369 p->one->rename_used, p->broken_pair);
4370 }
4371
4372 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
4373 {
4374 int i;
4375 if (msg)
4376 fprintf(stderr, "%s\n", msg);
4377 fprintf(stderr, "q->nr = %d\n", q->nr);
4378 for (i = 0; i < q->nr; i++) {
4379 struct diff_filepair *p = q->queue[i];
4380 diff_debug_filepair(p, i);
4381 }
4382 }
4383 #endif
4384
4385 static void diff_resolve_rename_copy(void)
4386 {
4387 int i;
4388 struct diff_filepair *p;
4389 struct diff_queue_struct *q = &diff_queued_diff;
4390
4391 diff_debug_queue("resolve-rename-copy", q);
4392
4393 for (i = 0; i < q->nr; i++) {
4394 p = q->queue[i];
4395 p->status = 0; /* undecided */
4396 if (DIFF_PAIR_UNMERGED(p))
4397 p->status = DIFF_STATUS_UNMERGED;
4398 else if (!DIFF_FILE_VALID(p->one))
4399 p->status = DIFF_STATUS_ADDED;
4400 else if (!DIFF_FILE_VALID(p->two))
4401 p->status = DIFF_STATUS_DELETED;
4402 else if (DIFF_PAIR_TYPE_CHANGED(p))
4403 p->status = DIFF_STATUS_TYPE_CHANGED;
4404
4405 /* from this point on, we are dealing with a pair
4406 * whose both sides are valid and of the same type, i.e.
4407 * either in-place edit or rename/copy edit.
4408 */
4409 else if (DIFF_PAIR_RENAME(p)) {
4410 /*
4411 * A rename might have re-connected a broken
4412 * pair up, causing the pathnames to be the
4413 * same again. If so, that's not a rename at
4414 * all, just a modification..
4415 *
4416 * Otherwise, see if this source was used for
4417 * multiple renames, in which case we decrement
4418 * the count, and call it a copy.
4419 */
4420 if (!strcmp(p->one->path, p->two->path))
4421 p->status = DIFF_STATUS_MODIFIED;
4422 else if (--p->one->rename_used > 0)
4423 p->status = DIFF_STATUS_COPIED;
4424 else
4425 p->status = DIFF_STATUS_RENAMED;
4426 }
4427 else if (oidcmp(&p->one->oid, &p->two->oid) ||
4428 p->one->mode != p->two->mode ||
4429 p->one->dirty_submodule ||
4430 p->two->dirty_submodule ||
4431 is_null_oid(&p->one->oid))
4432 p->status = DIFF_STATUS_MODIFIED;
4433 else {
4434 /* This is a "no-change" entry and should not
4435 * happen anymore, but prepare for broken callers.
4436 */
4437 error("feeding unmodified %s to diffcore",
4438 p->one->path);
4439 p->status = DIFF_STATUS_UNKNOWN;
4440 }
4441 }
4442 diff_debug_queue("resolve-rename-copy done", q);
4443 }
4444
4445 static int check_pair_status(struct diff_filepair *p)
4446 {
4447 switch (p->status) {
4448 case DIFF_STATUS_UNKNOWN:
4449 return 0;
4450 case 0:
4451 die("internal error in diff-resolve-rename-copy");
4452 default:
4453 return 1;
4454 }
4455 }
4456
4457 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
4458 {
4459 int fmt = opt->output_format;
4460
4461 if (fmt & DIFF_FORMAT_CHECKDIFF)
4462 diff_flush_checkdiff(p, opt);
4463 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
4464 diff_flush_raw(p, opt);
4465 else if (fmt & DIFF_FORMAT_NAME) {
4466 const char *name_a, *name_b;
4467 name_a = p->two->path;
4468 name_b = NULL;
4469 strip_prefix(opt->prefix_length, &name_a, &name_b);
4470 fprintf(opt->file, "%s", diff_line_prefix(opt));
4471 write_name_quoted(name_a, opt->file, opt->line_termination);
4472 }
4473 }
4474
4475 static void show_file_mode_name(FILE *file, const char *newdelete, struct diff_filespec *fs)
4476 {
4477 if (fs->mode)
4478 fprintf(file, " %s mode %06o ", newdelete, fs->mode);
4479 else
4480 fprintf(file, " %s ", newdelete);
4481 write_name_quoted(fs->path, file, '\n');
4482 }
4483
4484
4485 static void show_mode_change(FILE *file, struct diff_filepair *p, int show_name,
4486 const char *line_prefix)
4487 {
4488 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
4489 fprintf(file, "%s mode change %06o => %06o%c", line_prefix, p->one->mode,
4490 p->two->mode, show_name ? ' ' : '\n');
4491 if (show_name) {
4492 write_name_quoted(p->two->path, file, '\n');
4493 }
4494 }
4495 }
4496
4497 static void show_rename_copy(FILE *file, const char *renamecopy, struct diff_filepair *p,
4498 const char *line_prefix)
4499 {
4500 char *names = pprint_rename(p->one->path, p->two->path);
4501
4502 fprintf(file, " %s %s (%d%%)\n", renamecopy, names, similarity_index(p));
4503 free(names);
4504 show_mode_change(file, p, 0, line_prefix);
4505 }
4506
4507 static void diff_summary(struct diff_options *opt, struct diff_filepair *p)
4508 {
4509 FILE *file = opt->file;
4510 const char *line_prefix = diff_line_prefix(opt);
4511
4512 switch(p->status) {
4513 case DIFF_STATUS_DELETED:
4514 fputs(line_prefix, file);
4515 show_file_mode_name(file, "delete", p->one);
4516 break;
4517 case DIFF_STATUS_ADDED:
4518 fputs(line_prefix, file);
4519 show_file_mode_name(file, "create", p->two);
4520 break;
4521 case DIFF_STATUS_COPIED:
4522 fputs(line_prefix, file);
4523 show_rename_copy(file, "copy", p, line_prefix);
4524 break;
4525 case DIFF_STATUS_RENAMED:
4526 fputs(line_prefix, file);
4527 show_rename_copy(file, "rename", p, line_prefix);
4528 break;
4529 default:
4530 if (p->score) {
4531 fprintf(file, "%s rewrite ", line_prefix);
4532 write_name_quoted(p->two->path, file, ' ');
4533 fprintf(file, "(%d%%)\n", similarity_index(p));
4534 }
4535 show_mode_change(file, p, !p->score, line_prefix);
4536 break;
4537 }
4538 }
4539
4540 struct patch_id_t {
4541 git_SHA_CTX *ctx;
4542 int patchlen;
4543 };
4544
4545 static int remove_space(char *line, int len)
4546 {
4547 int i;
4548 char *dst = line;
4549 unsigned char c;
4550
4551 for (i = 0; i < len; i++)
4552 if (!isspace((c = line[i])))
4553 *dst++ = c;
4554
4555 return dst - line;
4556 }
4557
4558 static void patch_id_consume(void *priv, char *line, unsigned long len)
4559 {
4560 struct patch_id_t *data = priv;
4561 int new_len;
4562
4563 /* Ignore line numbers when computing the SHA1 of the patch */
4564 if (starts_with(line, "@@ -"))
4565 return;
4566
4567 new_len = remove_space(line, len);
4568
4569 git_SHA1_Update(data->ctx, line, new_len);
4570 data->patchlen += new_len;
4571 }
4572
4573 static void patch_id_add_string(git_SHA_CTX *ctx, const char *str)
4574 {
4575 git_SHA1_Update(ctx, str, strlen(str));
4576 }
4577
4578 static void patch_id_add_mode(git_SHA_CTX *ctx, unsigned mode)
4579 {
4580 /* large enough for 2^32 in octal */
4581 char buf[12];
4582 int len = xsnprintf(buf, sizeof(buf), "%06o", mode);
4583 git_SHA1_Update(ctx, buf, len);
4584 }
4585
4586 /* returns 0 upon success, and writes result into sha1 */
4587 static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1, int diff_header_only)
4588 {
4589 struct diff_queue_struct *q = &diff_queued_diff;
4590 int i;
4591 git_SHA_CTX ctx;
4592 struct patch_id_t data;
4593
4594 git_SHA1_Init(&ctx);
4595 memset(&data, 0, sizeof(struct patch_id_t));
4596 data.ctx = &ctx;
4597
4598 for (i = 0; i < q->nr; i++) {
4599 xpparam_t xpp;
4600 xdemitconf_t xecfg;
4601 mmfile_t mf1, mf2;
4602 struct diff_filepair *p = q->queue[i];
4603 int len1, len2;
4604
4605 memset(&xpp, 0, sizeof(xpp));
4606 memset(&xecfg, 0, sizeof(xecfg));
4607 if (p->status == 0)
4608 return error("internal diff status error");
4609 if (p->status == DIFF_STATUS_UNKNOWN)
4610 continue;
4611 if (diff_unmodified_pair(p))
4612 continue;
4613 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4614 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4615 continue;
4616 if (DIFF_PAIR_UNMERGED(p))
4617 continue;
4618
4619 diff_fill_sha1_info(p->one);
4620 diff_fill_sha1_info(p->two);
4621
4622 len1 = remove_space(p->one->path, strlen(p->one->path));
4623 len2 = remove_space(p->two->path, strlen(p->two->path));
4624 patch_id_add_string(&ctx, "diff--git");
4625 patch_id_add_string(&ctx, "a/");
4626 git_SHA1_Update(&ctx, p->one->path, len1);
4627 patch_id_add_string(&ctx, "b/");
4628 git_SHA1_Update(&ctx, p->two->path, len2);
4629
4630 if (p->one->mode == 0) {
4631 patch_id_add_string(&ctx, "newfilemode");
4632 patch_id_add_mode(&ctx, p->two->mode);
4633 patch_id_add_string(&ctx, "---/dev/null");
4634 patch_id_add_string(&ctx, "+++b/");
4635 git_SHA1_Update(&ctx, p->two->path, len2);
4636 } else if (p->two->mode == 0) {
4637 patch_id_add_string(&ctx, "deletedfilemode");
4638 patch_id_add_mode(&ctx, p->one->mode);
4639 patch_id_add_string(&ctx, "---a/");
4640 git_SHA1_Update(&ctx, p->one->path, len1);
4641 patch_id_add_string(&ctx, "+++/dev/null");
4642 } else {
4643 patch_id_add_string(&ctx, "---a/");
4644 git_SHA1_Update(&ctx, p->one->path, len1);
4645 patch_id_add_string(&ctx, "+++b/");
4646 git_SHA1_Update(&ctx, p->two->path, len2);
4647 }
4648
4649 if (diff_header_only)
4650 continue;
4651
4652 if (fill_mmfile(&mf1, p->one) < 0 ||
4653 fill_mmfile(&mf2, p->two) < 0)
4654 return error("unable to read files to diff");
4655
4656 if (diff_filespec_is_binary(p->one) ||
4657 diff_filespec_is_binary(p->two)) {
4658 git_SHA1_Update(&ctx, oid_to_hex(&p->one->oid),
4659 40);
4660 git_SHA1_Update(&ctx, oid_to_hex(&p->two->oid),
4661 40);
4662 continue;
4663 }
4664
4665 xpp.flags = 0;
4666 xecfg.ctxlen = 3;
4667 xecfg.flags = 0;
4668 if (xdi_diff_outf(&mf1, &mf2, patch_id_consume, &data,
4669 &xpp, &xecfg))
4670 return error("unable to generate patch-id diff for %s",
4671 p->one->path);
4672 }
4673
4674 git_SHA1_Final(sha1, &ctx);
4675 return 0;
4676 }
4677
4678 int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1, int diff_header_only)
4679 {
4680 struct diff_queue_struct *q = &diff_queued_diff;
4681 int i;
4682 int result = diff_get_patch_id(options, sha1, diff_header_only);
4683
4684 for (i = 0; i < q->nr; i++)
4685 diff_free_filepair(q->queue[i]);
4686
4687 free(q->queue);
4688 DIFF_QUEUE_CLEAR(q);
4689
4690 return result;
4691 }
4692
4693 static int is_summary_empty(const struct diff_queue_struct *q)
4694 {
4695 int i;
4696
4697 for (i = 0; i < q->nr; i++) {
4698 const struct diff_filepair *p = q->queue[i];
4699
4700 switch (p->status) {
4701 case DIFF_STATUS_DELETED:
4702 case DIFF_STATUS_ADDED:
4703 case DIFF_STATUS_COPIED:
4704 case DIFF_STATUS_RENAMED:
4705 return 0;
4706 default:
4707 if (p->score)
4708 return 0;
4709 if (p->one->mode && p->two->mode &&
4710 p->one->mode != p->two->mode)
4711 return 0;
4712 break;
4713 }
4714 }
4715 return 1;
4716 }
4717
4718 static const char rename_limit_warning[] =
4719 N_("inexact rename detection was skipped due to too many files.");
4720
4721 static const char degrade_cc_to_c_warning[] =
4722 N_("only found copies from modified paths due to too many files.");
4723
4724 static const char rename_limit_advice[] =
4725 N_("you may want to set your %s variable to at least "
4726 "%d and retry the command.");
4727
4728 void diff_warn_rename_limit(const char *varname, int needed, int degraded_cc)
4729 {
4730 if (degraded_cc)
4731 warning(_(degrade_cc_to_c_warning));
4732 else if (needed)
4733 warning(_(rename_limit_warning));
4734 else
4735 return;
4736 if (0 < needed && needed < 32767)
4737 warning(_(rename_limit_advice), varname, needed);
4738 }
4739
4740 void diff_flush(struct diff_options *options)
4741 {
4742 struct diff_queue_struct *q = &diff_queued_diff;
4743 int i, output_format = options->output_format;
4744 int separator = 0;
4745 int dirstat_by_line = 0;
4746
4747 /*
4748 * Order: raw, stat, summary, patch
4749 * or: name/name-status/checkdiff (other bits clear)
4750 */
4751 if (!q->nr)
4752 goto free_queue;
4753
4754 if (output_format & (DIFF_FORMAT_RAW |
4755 DIFF_FORMAT_NAME |
4756 DIFF_FORMAT_NAME_STATUS |
4757 DIFF_FORMAT_CHECKDIFF)) {
4758 for (i = 0; i < q->nr; i++) {
4759 struct diff_filepair *p = q->queue[i];
4760 if (check_pair_status(p))
4761 flush_one_pair(p, options);
4762 }
4763 separator++;
4764 }
4765
4766 if (output_format & DIFF_FORMAT_DIRSTAT && DIFF_OPT_TST(options, DIRSTAT_BY_LINE))
4767 dirstat_by_line = 1;
4768
4769 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT) ||
4770 dirstat_by_line) {
4771 struct diffstat_t diffstat;
4772
4773 memset(&diffstat, 0, sizeof(struct diffstat_t));
4774 for (i = 0; i < q->nr; i++) {
4775 struct diff_filepair *p = q->queue[i];
4776 if (check_pair_status(p))
4777 diff_flush_stat(p, options, &diffstat);
4778 }
4779 if (output_format & DIFF_FORMAT_NUMSTAT)
4780 show_numstat(&diffstat, options);
4781 if (output_format & DIFF_FORMAT_DIFFSTAT)
4782 show_stats(&diffstat, options);
4783 if (output_format & DIFF_FORMAT_SHORTSTAT)
4784 show_shortstats(&diffstat, options);
4785 if (output_format & DIFF_FORMAT_DIRSTAT && dirstat_by_line)
4786 show_dirstat_by_line(&diffstat, options);
4787 free_diffstat_info(&diffstat);
4788 separator++;
4789 }
4790 if ((output_format & DIFF_FORMAT_DIRSTAT) && !dirstat_by_line)
4791 show_dirstat(options);
4792
4793 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
4794 for (i = 0; i < q->nr; i++) {
4795 diff_summary(options, q->queue[i]);
4796 }
4797 separator++;
4798 }
4799
4800 if (output_format & DIFF_FORMAT_NO_OUTPUT &&
4801 DIFF_OPT_TST(options, EXIT_WITH_STATUS) &&
4802 DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
4803 /*
4804 * run diff_flush_patch for the exit status. setting
4805 * options->file to /dev/null should be safe, because we
4806 * aren't supposed to produce any output anyway.
4807 */
4808 if (options->close_file)
4809 fclose(options->file);
4810 options->file = fopen("/dev/null", "w");
4811 if (!options->file)
4812 die_errno("Could not open /dev/null");
4813 options->close_file = 1;
4814 for (i = 0; i < q->nr; i++) {
4815 struct diff_filepair *p = q->queue[i];
4816 if (check_pair_status(p))
4817 diff_flush_patch(p, options);
4818 if (options->found_changes)
4819 break;
4820 }
4821 }
4822
4823 if (output_format & DIFF_FORMAT_PATCH) {
4824 if (separator) {
4825 fprintf(options->file, "%s%c",
4826 diff_line_prefix(options),
4827 options->line_termination);
4828 if (options->stat_sep) {
4829 /* attach patch instead of inline */
4830 fputs(options->stat_sep, options->file);
4831 }
4832 }
4833
4834 for (i = 0; i < q->nr; i++) {
4835 struct diff_filepair *p = q->queue[i];
4836 if (check_pair_status(p))
4837 diff_flush_patch(p, options);
4838 }
4839 }
4840
4841 if (output_format & DIFF_FORMAT_CALLBACK)
4842 options->format_callback(q, options, options->format_callback_data);
4843
4844 for (i = 0; i < q->nr; i++)
4845 diff_free_filepair(q->queue[i]);
4846 free_queue:
4847 free(q->queue);
4848 DIFF_QUEUE_CLEAR(q);
4849 if (options->close_file)
4850 fclose(options->file);
4851
4852 /*
4853 * Report the content-level differences with HAS_CHANGES;
4854 * diff_addremove/diff_change does not set the bit when
4855 * DIFF_FROM_CONTENTS is in effect (e.g. with -w).
4856 */
4857 if (DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
4858 if (options->found_changes)
4859 DIFF_OPT_SET(options, HAS_CHANGES);
4860 else
4861 DIFF_OPT_CLR(options, HAS_CHANGES);
4862 }
4863 }
4864
4865 static int match_filter(const struct diff_options *options, const struct diff_filepair *p)
4866 {
4867 return (((p->status == DIFF_STATUS_MODIFIED) &&
4868 ((p->score &&
4869 filter_bit_tst(DIFF_STATUS_FILTER_BROKEN, options)) ||
4870 (!p->score &&
4871 filter_bit_tst(DIFF_STATUS_MODIFIED, options)))) ||
4872 ((p->status != DIFF_STATUS_MODIFIED) &&
4873 filter_bit_tst(p->status, options)));
4874 }
4875
4876 static void diffcore_apply_filter(struct diff_options *options)
4877 {
4878 int i;
4879 struct diff_queue_struct *q = &diff_queued_diff;
4880 struct diff_queue_struct outq;
4881
4882 DIFF_QUEUE_CLEAR(&outq);
4883
4884 if (!options->filter)
4885 return;
4886
4887 if (filter_bit_tst(DIFF_STATUS_FILTER_AON, options)) {
4888 int found;
4889 for (i = found = 0; !found && i < q->nr; i++) {
4890 if (match_filter(options, q->queue[i]))
4891 found++;
4892 }
4893 if (found)
4894 return;
4895
4896 /* otherwise we will clear the whole queue
4897 * by copying the empty outq at the end of this
4898 * function, but first clear the current entries
4899 * in the queue.
4900 */
4901 for (i = 0; i < q->nr; i++)
4902 diff_free_filepair(q->queue[i]);
4903 }
4904 else {
4905 /* Only the matching ones */
4906 for (i = 0; i < q->nr; i++) {
4907 struct diff_filepair *p = q->queue[i];
4908 if (match_filter(options, p))
4909 diff_q(&outq, p);
4910 else
4911 diff_free_filepair(p);
4912 }
4913 }
4914 free(q->queue);
4915 *q = outq;
4916 }
4917
4918 /* Check whether two filespecs with the same mode and size are identical */
4919 static int diff_filespec_is_identical(struct diff_filespec *one,
4920 struct diff_filespec *two)
4921 {
4922 if (S_ISGITLINK(one->mode))
4923 return 0;
4924 if (diff_populate_filespec(one, 0))
4925 return 0;
4926 if (diff_populate_filespec(two, 0))
4927 return 0;
4928 return !memcmp(one->data, two->data, one->size);
4929 }
4930
4931 static int diff_filespec_check_stat_unmatch(struct diff_filepair *p)
4932 {
4933 if (p->done_skip_stat_unmatch)
4934 return p->skip_stat_unmatch_result;
4935
4936 p->done_skip_stat_unmatch = 1;
4937 p->skip_stat_unmatch_result = 0;
4938 /*
4939 * 1. Entries that come from stat info dirtiness
4940 * always have both sides (iow, not create/delete),
4941 * one side of the object name is unknown, with
4942 * the same mode and size. Keep the ones that
4943 * do not match these criteria. They have real
4944 * differences.
4945 *
4946 * 2. At this point, the file is known to be modified,
4947 * with the same mode and size, and the object
4948 * name of one side is unknown. Need to inspect
4949 * the identical contents.
4950 */
4951 if (!DIFF_FILE_VALID(p->one) || /* (1) */
4952 !DIFF_FILE_VALID(p->two) ||
4953 (p->one->oid_valid && p->two->oid_valid) ||
4954 (p->one->mode != p->two->mode) ||
4955 diff_populate_filespec(p->one, CHECK_SIZE_ONLY) ||
4956 diff_populate_filespec(p->two, CHECK_SIZE_ONLY) ||
4957 (p->one->size != p->two->size) ||
4958 !diff_filespec_is_identical(p->one, p->two)) /* (2) */
4959 p->skip_stat_unmatch_result = 1;
4960 return p->skip_stat_unmatch_result;
4961 }
4962
4963 static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
4964 {
4965 int i;
4966 struct diff_queue_struct *q = &diff_queued_diff;
4967 struct diff_queue_struct outq;
4968 DIFF_QUEUE_CLEAR(&outq);
4969
4970 for (i = 0; i < q->nr; i++) {
4971 struct diff_filepair *p = q->queue[i];
4972
4973 if (diff_filespec_check_stat_unmatch(p))
4974 diff_q(&outq, p);
4975 else {
4976 /*
4977 * The caller can subtract 1 from skip_stat_unmatch
4978 * to determine how many paths were dirty only
4979 * due to stat info mismatch.
4980 */
4981 if (!DIFF_OPT_TST(diffopt, NO_INDEX))
4982 diffopt->skip_stat_unmatch++;
4983 diff_free_filepair(p);
4984 }
4985 }
4986 free(q->queue);
4987 *q = outq;
4988 }
4989
4990 static int diffnamecmp(const void *a_, const void *b_)
4991 {
4992 const struct diff_filepair *a = *((const struct diff_filepair **)a_);
4993 const struct diff_filepair *b = *((const struct diff_filepair **)b_);
4994 const char *name_a, *name_b;
4995
4996 name_a = a->one ? a->one->path : a->two->path;
4997 name_b = b->one ? b->one->path : b->two->path;
4998 return strcmp(name_a, name_b);
4999 }
5000
5001 void diffcore_fix_diff_index(struct diff_options *options)
5002 {
5003 struct diff_queue_struct *q = &diff_queued_diff;
5004 QSORT(q->queue, q->nr, diffnamecmp);
5005 }
5006
5007 void diffcore_std(struct diff_options *options)
5008 {
5009 /* NOTE please keep the following in sync with diff_tree_combined() */
5010 if (options->skip_stat_unmatch)
5011 diffcore_skip_stat_unmatch(options);
5012 if (!options->found_follow) {
5013 /* See try_to_follow_renames() in tree-diff.c */
5014 if (options->break_opt != -1)
5015 diffcore_break(options->break_opt);
5016 if (options->detect_rename)
5017 diffcore_rename(options);
5018 if (options->break_opt != -1)
5019 diffcore_merge_broken();
5020 }
5021 if (options->pickaxe)
5022 diffcore_pickaxe(options);
5023 if (options->orderfile)
5024 diffcore_order(options->orderfile);
5025 if (!options->found_follow)
5026 /* See try_to_follow_renames() in tree-diff.c */
5027 diff_resolve_rename_copy();
5028 diffcore_apply_filter(options);
5029
5030 if (diff_queued_diff.nr && !DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
5031 DIFF_OPT_SET(options, HAS_CHANGES);
5032 else
5033 DIFF_OPT_CLR(options, HAS_CHANGES);
5034
5035 options->found_follow = 0;
5036 }
5037
5038 int diff_result_code(struct diff_options *opt, int status)
5039 {
5040 int result = 0;
5041
5042 diff_warn_rename_limit("diff.renameLimit",
5043 opt->needed_rename_limit,
5044 opt->degraded_cc_to_c);
5045 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
5046 !(opt->output_format & DIFF_FORMAT_CHECKDIFF))
5047 return status;
5048 if (DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
5049 DIFF_OPT_TST(opt, HAS_CHANGES))
5050 result |= 01;
5051 if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) &&
5052 DIFF_OPT_TST(opt, CHECK_FAILED))
5053 result |= 02;
5054 return result;
5055 }
5056
5057 int diff_can_quit_early(struct diff_options *opt)
5058 {
5059 return (DIFF_OPT_TST(opt, QUICK) &&
5060 !opt->filter &&
5061 DIFF_OPT_TST(opt, HAS_CHANGES));
5062 }
5063
5064 /*
5065 * Shall changes to this submodule be ignored?
5066 *
5067 * Submodule changes can be configured to be ignored separately for each path,
5068 * but that configuration can be overridden from the command line.
5069 */
5070 static int is_submodule_ignored(const char *path, struct diff_options *options)
5071 {
5072 int ignored = 0;
5073 unsigned orig_flags = options->flags;
5074 if (!DIFF_OPT_TST(options, OVERRIDE_SUBMODULE_CONFIG))
5075 set_diffopt_flags_from_submodule_config(options, path);
5076 if (DIFF_OPT_TST(options, IGNORE_SUBMODULES))
5077 ignored = 1;
5078 options->flags = orig_flags;
5079 return ignored;
5080 }
5081
5082 void diff_addremove(struct diff_options *options,
5083 int addremove, unsigned mode,
5084 const unsigned char *sha1,
5085 int sha1_valid,
5086 const char *concatpath, unsigned dirty_submodule)
5087 {
5088 struct diff_filespec *one, *two;
5089
5090 if (S_ISGITLINK(mode) && is_submodule_ignored(concatpath, options))
5091 return;
5092
5093 /* This may look odd, but it is a preparation for
5094 * feeding "there are unchanged files which should
5095 * not produce diffs, but when you are doing copy
5096 * detection you would need them, so here they are"
5097 * entries to the diff-core. They will be prefixed
5098 * with something like '=' or '*' (I haven't decided
5099 * which but should not make any difference).
5100 * Feeding the same new and old to diff_change()
5101 * also has the same effect.
5102 * Before the final output happens, they are pruned after
5103 * merged into rename/copy pairs as appropriate.
5104 */
5105 if (DIFF_OPT_TST(options, REVERSE_DIFF))
5106 addremove = (addremove == '+' ? '-' :
5107 addremove == '-' ? '+' : addremove);
5108
5109 if (options->prefix &&
5110 strncmp(concatpath, options->prefix, options->prefix_length))
5111 return;
5112
5113 one = alloc_filespec(concatpath);
5114 two = alloc_filespec(concatpath);
5115
5116 if (addremove != '+')
5117 fill_filespec(one, sha1, sha1_valid, mode);
5118 if (addremove != '-') {
5119 fill_filespec(two, sha1, sha1_valid, mode);
5120 two->dirty_submodule = dirty_submodule;
5121 }
5122
5123 diff_queue(&diff_queued_diff, one, two);
5124 if (!DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
5125 DIFF_OPT_SET(options, HAS_CHANGES);
5126 }
5127
5128 void diff_change(struct diff_options *options,
5129 unsigned old_mode, unsigned new_mode,
5130 const unsigned char *old_sha1,
5131 const unsigned char *new_sha1,
5132 int old_sha1_valid, int new_sha1_valid,
5133 const char *concatpath,
5134 unsigned old_dirty_submodule, unsigned new_dirty_submodule)
5135 {
5136 struct diff_filespec *one, *two;
5137 struct diff_filepair *p;
5138
5139 if (S_ISGITLINK(old_mode) && S_ISGITLINK(new_mode) &&
5140 is_submodule_ignored(concatpath, options))
5141 return;
5142
5143 if (DIFF_OPT_TST(options, REVERSE_DIFF)) {
5144 SWAP(old_mode, new_mode);
5145 SWAP(old_sha1, new_sha1);
5146 SWAP(old_sha1_valid, new_sha1_valid);
5147 SWAP(old_dirty_submodule, new_dirty_submodule);
5148 }
5149
5150 if (options->prefix &&
5151 strncmp(concatpath, options->prefix, options->prefix_length))
5152 return;
5153
5154 one = alloc_filespec(concatpath);
5155 two = alloc_filespec(concatpath);
5156 fill_filespec(one, old_sha1, old_sha1_valid, old_mode);
5157 fill_filespec(two, new_sha1, new_sha1_valid, new_mode);
5158 one->dirty_submodule = old_dirty_submodule;
5159 two->dirty_submodule = new_dirty_submodule;
5160 p = diff_queue(&diff_queued_diff, one, two);
5161
5162 if (DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
5163 return;
5164
5165 if (DIFF_OPT_TST(options, QUICK) && options->skip_stat_unmatch &&
5166 !diff_filespec_check_stat_unmatch(p))
5167 return;
5168
5169 DIFF_OPT_SET(options, HAS_CHANGES);
5170 }
5171
5172 struct diff_filepair *diff_unmerge(struct diff_options *options, const char *path)
5173 {
5174 struct diff_filepair *pair;
5175 struct diff_filespec *one, *two;
5176
5177 if (options->prefix &&
5178 strncmp(path, options->prefix, options->prefix_length))
5179 return NULL;
5180
5181 one = alloc_filespec(path);
5182 two = alloc_filespec(path);
5183 pair = diff_queue(&diff_queued_diff, one, two);
5184 pair->is_unmerged = 1;
5185 return pair;
5186 }
5187
5188 static char *run_textconv(const char *pgm, struct diff_filespec *spec,
5189 size_t *outsize)
5190 {
5191 struct diff_tempfile *temp;
5192 const char *argv[3];
5193 const char **arg = argv;
5194 struct child_process child = CHILD_PROCESS_INIT;
5195 struct strbuf buf = STRBUF_INIT;
5196 int err = 0;
5197
5198 temp = prepare_temp_file(spec->path, spec);
5199 *arg++ = pgm;
5200 *arg++ = temp->name;
5201 *arg = NULL;
5202
5203 child.use_shell = 1;
5204 child.argv = argv;
5205 child.out = -1;
5206 if (start_command(&child)) {
5207 remove_tempfile();
5208 return NULL;
5209 }
5210
5211 if (strbuf_read(&buf, child.out, 0) < 0)
5212 err = error("error reading from textconv command '%s'", pgm);
5213 close(child.out);
5214
5215 if (finish_command(&child) || err) {
5216 strbuf_release(&buf);
5217 remove_tempfile();
5218 return NULL;
5219 }
5220 remove_tempfile();
5221
5222 return strbuf_detach(&buf, outsize);
5223 }
5224
5225 size_t fill_textconv(struct userdiff_driver *driver,
5226 struct diff_filespec *df,
5227 char **outbuf)
5228 {
5229 size_t size;
5230
5231 if (!driver) {
5232 if (!DIFF_FILE_VALID(df)) {
5233 *outbuf = "";
5234 return 0;
5235 }
5236 if (diff_populate_filespec(df, 0))
5237 die("unable to read files to diff");
5238 *outbuf = df->data;
5239 return df->size;
5240 }
5241
5242 if (!driver->textconv)
5243 die("BUG: fill_textconv called with non-textconv driver");
5244
5245 if (driver->textconv_cache && df->oid_valid) {
5246 *outbuf = notes_cache_get(driver->textconv_cache,
5247 &df->oid,
5248 &size);
5249 if (*outbuf)
5250 return size;
5251 }
5252
5253 *outbuf = run_textconv(driver->textconv, df, &size);
5254 if (!*outbuf)
5255 die("unable to read files to diff");
5256
5257 if (driver->textconv_cache && df->oid_valid) {
5258 /* ignore errors, as we might be in a readonly repository */
5259 notes_cache_put(driver->textconv_cache, &df->oid, *outbuf,
5260 size);
5261 /*
5262 * we could save up changes and flush them all at the end,
5263 * but we would need an extra call after all diffing is done.
5264 * Since generating a cache entry is the slow path anyway,
5265 * this extra overhead probably isn't a big deal.
5266 */
5267 notes_cache_write(driver->textconv_cache);
5268 }
5269
5270 return size;
5271 }
5272
5273 void setup_diff_pager(struct diff_options *opt)
5274 {
5275 /*
5276 * If the user asked for our exit code, then either they want --quiet
5277 * or --exit-code. We should definitely not bother with a pager in the
5278 * former case, as we will generate no output. Since we still properly
5279 * report our exit code even when a pager is run, we _could_ run a
5280 * pager with --exit-code. But since we have not done so historically,
5281 * and because it is easy to find people oneline advising "git diff
5282 * --exit-code" in hooks and other scripts, we do not do so.
5283 */
5284 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
5285 check_pager_config("diff") != 0)
5286 setup_pager();
5287 }
The Best VCS Around