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Merge branch 'js/travis-32bit-linux' into maint
[alt-git.git] / diff.c
blob051761be405ece65423d43830f08ed7b7dec9756
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_SHA1_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 if (size_only)
2874 return 0;
2875 if ((flags & CHECK_BINARY) &&
2876 s->size > big_file_threshold && s->is_binary == -1) {
2877 s->is_binary = 1;
2878 return 0;
2879 }
2880 fd = open(s->path, O_RDONLY);
2881 if (fd < 0)
2882 goto err_empty;
2883 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
2884 close(fd);
2885 s->should_munmap = 1;
2886
2887 /*
2888 * Convert from working tree format to canonical git format
2889 */
2890 if (convert_to_git(s->path, s->data, s->size, &buf, crlf_warn)) {
2891 size_t size = 0;
2892 munmap(s->data, s->size);
2893 s->should_munmap = 0;
2894 s->data = strbuf_detach(&buf, &size);
2895 s->size = size;
2896 s->should_free = 1;
2897 }
2898 }
2899 else {
2900 enum object_type type;
2901 if (size_only || (flags & CHECK_BINARY)) {
2902 type = sha1_object_info(s->oid.hash, &s->size);
2903 if (type < 0)
2904 die("unable to read %s",
2905 oid_to_hex(&s->oid));
2906 if (size_only)
2907 return 0;
2908 if (s->size > big_file_threshold && s->is_binary == -1) {
2909 s->is_binary = 1;
2910 return 0;
2911 }
2912 }
2913 s->data = read_sha1_file(s->oid.hash, &type, &s->size);
2914 if (!s->data)
2915 die("unable to read %s", oid_to_hex(&s->oid));
2916 s->should_free = 1;
2917 }
2918 return 0;
2919 }
2920
2921 void diff_free_filespec_blob(struct diff_filespec *s)
2922 {
2923 if (s->should_free)
2924 free(s->data);
2925 else if (s->should_munmap)
2926 munmap(s->data, s->size);
2927
2928 if (s->should_free || s->should_munmap) {
2929 s->should_free = s->should_munmap = 0;
2930 s->data = NULL;
2931 }
2932 }
2933
2934 void diff_free_filespec_data(struct diff_filespec *s)
2935 {
2936 diff_free_filespec_blob(s);
2937 free(s->cnt_data);
2938 s->cnt_data = NULL;
2939 }
2940
2941 static void prep_temp_blob(const char *path, struct diff_tempfile *temp,
2942 void *blob,
2943 unsigned long size,
2944 const struct object_id *oid,
2945 int mode)
2946 {
2947 int fd;
2948 struct strbuf buf = STRBUF_INIT;
2949 struct strbuf template = STRBUF_INIT;
2950 char *path_dup = xstrdup(path);
2951 const char *base = basename(path_dup);
2952
2953 /* Generate "XXXXXX_basename.ext" */
2954 strbuf_addstr(&template, "XXXXXX_");
2955 strbuf_addstr(&template, base);
2956
2957 fd = mks_tempfile_ts(&temp->tempfile, template.buf, strlen(base) + 1);
2958 if (fd < 0)
2959 die_errno("unable to create temp-file");
2960 if (convert_to_working_tree(path,
2961 (const char *)blob, (size_t)size, &buf)) {
2962 blob = buf.buf;
2963 size = buf.len;
2964 }
2965 if (write_in_full(fd, blob, size) != size)
2966 die_errno("unable to write temp-file");
2967 close_tempfile(&temp->tempfile);
2968 temp->name = get_tempfile_path(&temp->tempfile);
2969 oid_to_hex_r(temp->hex, oid);
2970 xsnprintf(temp->mode, sizeof(temp->mode), "%06o", mode);
2971 strbuf_release(&buf);
2972 strbuf_release(&template);
2973 free(path_dup);
2974 }
2975
2976 static struct diff_tempfile *prepare_temp_file(const char *name,
2977 struct diff_filespec *one)
2978 {
2979 struct diff_tempfile *temp = claim_diff_tempfile();
2980
2981 if (!DIFF_FILE_VALID(one)) {
2982 not_a_valid_file:
2983 /* A '-' entry produces this for file-2, and
2984 * a '+' entry produces this for file-1.
2985 */
2986 temp->name = "/dev/null";
2987 xsnprintf(temp->hex, sizeof(temp->hex), ".");
2988 xsnprintf(temp->mode, sizeof(temp->mode), ".");
2989 return temp;
2990 }
2991
2992 if (!S_ISGITLINK(one->mode) &&
2993 (!one->oid_valid ||
2994 reuse_worktree_file(name, one->oid.hash, 1))) {
2995 struct stat st;
2996 if (lstat(name, &st) < 0) {
2997 if (errno == ENOENT)
2998 goto not_a_valid_file;
2999 die_errno("stat(%s)", name);
3000 }
3001 if (S_ISLNK(st.st_mode)) {
3002 struct strbuf sb = STRBUF_INIT;
3003 if (strbuf_readlink(&sb, name, st.st_size) < 0)
3004 die_errno("readlink(%s)", name);
3005 prep_temp_blob(name, temp, sb.buf, sb.len,
3006 (one->oid_valid ?
3007 &one->oid : &null_oid),
3008 (one->oid_valid ?
3009 one->mode : S_IFLNK));
3010 strbuf_release(&sb);
3011 }
3012 else {
3013 /* we can borrow from the file in the work tree */
3014 temp->name = name;
3015 if (!one->oid_valid)
3016 sha1_to_hex_r(temp->hex, null_sha1);
3017 else
3018 oid_to_hex_r(temp->hex, &one->oid);
3019 /* Even though we may sometimes borrow the
3020 * contents from the work tree, we always want
3021 * one->mode. mode is trustworthy even when
3022 * !(one->sha1_valid), as long as
3023 * DIFF_FILE_VALID(one).
3024 */
3025 xsnprintf(temp->mode, sizeof(temp->mode), "%06o", one->mode);
3026 }
3027 return temp;
3028 }
3029 else {
3030 if (diff_populate_filespec(one, 0))
3031 die("cannot read data blob for %s", one->path);
3032 prep_temp_blob(name, temp, one->data, one->size,
3033 &one->oid, one->mode);
3034 }
3035 return temp;
3036 }
3037
3038 static void add_external_diff_name(struct argv_array *argv,
3039 const char *name,
3040 struct diff_filespec *df)
3041 {
3042 struct diff_tempfile *temp = prepare_temp_file(name, df);
3043 argv_array_push(argv, temp->name);
3044 argv_array_push(argv, temp->hex);
3045 argv_array_push(argv, temp->mode);
3046 }
3047
3048 /* An external diff command takes:
3049 *
3050 * diff-cmd name infile1 infile1-sha1 infile1-mode \
3051 * infile2 infile2-sha1 infile2-mode [ rename-to ]
3052 *
3053 */
3054 static void run_external_diff(const char *pgm,
3055 const char *name,
3056 const char *other,
3057 struct diff_filespec *one,
3058 struct diff_filespec *two,
3059 const char *xfrm_msg,
3060 int complete_rewrite,
3061 struct diff_options *o)
3062 {
3063 struct argv_array argv = ARGV_ARRAY_INIT;
3064 struct argv_array env = ARGV_ARRAY_INIT;
3065 struct diff_queue_struct *q = &diff_queued_diff;
3066
3067 argv_array_push(&argv, pgm);
3068 argv_array_push(&argv, name);
3069
3070 if (one && two) {
3071 add_external_diff_name(&argv, name, one);
3072 if (!other)
3073 add_external_diff_name(&argv, name, two);
3074 else {
3075 add_external_diff_name(&argv, other, two);
3076 argv_array_push(&argv, other);
3077 argv_array_push(&argv, xfrm_msg);
3078 }
3079 }
3080
3081 argv_array_pushf(&env, "GIT_DIFF_PATH_COUNTER=%d", ++o->diff_path_counter);
3082 argv_array_pushf(&env, "GIT_DIFF_PATH_TOTAL=%d", q->nr);
3083
3084 if (run_command_v_opt_cd_env(argv.argv, RUN_USING_SHELL, NULL, env.argv))
3085 die(_("external diff died, stopping at %s"), name);
3086
3087 remove_tempfile();
3088 argv_array_clear(&argv);
3089 argv_array_clear(&env);
3090 }
3091
3092 static int similarity_index(struct diff_filepair *p)
3093 {
3094 return p->score * 100 / MAX_SCORE;
3095 }
3096
3097 static const char *diff_abbrev_oid(const struct object_id *oid, int abbrev)
3098 {
3099 if (startup_info->have_repository)
3100 return find_unique_abbrev(oid->hash, abbrev);
3101 else {
3102 char *hex = oid_to_hex(oid);
3103 if (abbrev < 0)
3104 abbrev = FALLBACK_DEFAULT_ABBREV;
3105 if (abbrev > GIT_SHA1_HEXSZ)
3106 die("BUG: oid abbreviation out of range: %d", abbrev);
3107 if (abbrev)
3108 hex[abbrev] = '\0';
3109 return hex;
3110 }
3111 }
3112
3113 static void fill_metainfo(struct strbuf *msg,
3114 const char *name,
3115 const char *other,
3116 struct diff_filespec *one,
3117 struct diff_filespec *two,
3118 struct diff_options *o,
3119 struct diff_filepair *p,
3120 int *must_show_header,
3121 int use_color)
3122 {
3123 const char *set = diff_get_color(use_color, DIFF_METAINFO);
3124 const char *reset = diff_get_color(use_color, DIFF_RESET);
3125 const char *line_prefix = diff_line_prefix(o);
3126
3127 *must_show_header = 1;
3128 strbuf_init(msg, PATH_MAX * 2 + 300);
3129 switch (p->status) {
3130 case DIFF_STATUS_COPIED:
3131 strbuf_addf(msg, "%s%ssimilarity index %d%%",
3132 line_prefix, set, similarity_index(p));
3133 strbuf_addf(msg, "%s\n%s%scopy from ",
3134 reset, line_prefix, set);
3135 quote_c_style(name, msg, NULL, 0);
3136 strbuf_addf(msg, "%s\n%s%scopy to ", reset, line_prefix, set);
3137 quote_c_style(other, msg, NULL, 0);
3138 strbuf_addf(msg, "%s\n", reset);
3139 break;
3140 case DIFF_STATUS_RENAMED:
3141 strbuf_addf(msg, "%s%ssimilarity index %d%%",
3142 line_prefix, set, similarity_index(p));
3143 strbuf_addf(msg, "%s\n%s%srename from ",
3144 reset, line_prefix, set);
3145 quote_c_style(name, msg, NULL, 0);
3146 strbuf_addf(msg, "%s\n%s%srename to ",
3147 reset, line_prefix, set);
3148 quote_c_style(other, msg, NULL, 0);
3149 strbuf_addf(msg, "%s\n", reset);
3150 break;
3151 case DIFF_STATUS_MODIFIED:
3152 if (p->score) {
3153 strbuf_addf(msg, "%s%sdissimilarity index %d%%%s\n",
3154 line_prefix,
3155 set, similarity_index(p), reset);
3156 break;
3157 }
3158 /* fallthru */
3159 default:
3160 *must_show_header = 0;
3161 }
3162 if (one && two && oidcmp(&one->oid, &two->oid)) {
3163 int abbrev = DIFF_OPT_TST(o, FULL_INDEX) ? 40 : DEFAULT_ABBREV;
3164
3165 if (DIFF_OPT_TST(o, BINARY)) {
3166 mmfile_t mf;
3167 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
3168 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
3169 abbrev = 40;
3170 }
3171 strbuf_addf(msg, "%s%sindex %s..%s", line_prefix, set,
3172 diff_abbrev_oid(&one->oid, abbrev),
3173 diff_abbrev_oid(&two->oid, abbrev));
3174 if (one->mode == two->mode)
3175 strbuf_addf(msg, " %06o", one->mode);
3176 strbuf_addf(msg, "%s\n", reset);
3177 }
3178 }
3179
3180 static void run_diff_cmd(const char *pgm,
3181 const char *name,
3182 const char *other,
3183 const char *attr_path,
3184 struct diff_filespec *one,
3185 struct diff_filespec *two,
3186 struct strbuf *msg,
3187 struct diff_options *o,
3188 struct diff_filepair *p)
3189 {
3190 const char *xfrm_msg = NULL;
3191 int complete_rewrite = (p->status == DIFF_STATUS_MODIFIED) && p->score;
3192 int must_show_header = 0;
3193
3194
3195 if (DIFF_OPT_TST(o, ALLOW_EXTERNAL)) {
3196 struct userdiff_driver *drv = userdiff_find_by_path(attr_path);
3197 if (drv && drv->external)
3198 pgm = drv->external;
3199 }
3200
3201 if (msg) {
3202 /*
3203 * don't use colors when the header is intended for an
3204 * external diff driver
3205 */
3206 fill_metainfo(msg, name, other, one, two, o, p,
3207 &must_show_header,
3208 want_color(o->use_color) && !pgm);
3209 xfrm_msg = msg->len ? msg->buf : NULL;
3210 }
3211
3212 if (pgm) {
3213 run_external_diff(pgm, name, other, one, two, xfrm_msg,
3214 complete_rewrite, o);
3215 return;
3216 }
3217 if (one && two)
3218 builtin_diff(name, other ? other : name,
3219 one, two, xfrm_msg, must_show_header,
3220 o, complete_rewrite);
3221 else
3222 fprintf(o->file, "* Unmerged path %s\n", name);
3223 }
3224
3225 static void diff_fill_sha1_info(struct diff_filespec *one)
3226 {
3227 if (DIFF_FILE_VALID(one)) {
3228 if (!one->oid_valid) {
3229 struct stat st;
3230 if (one->is_stdin) {
3231 oidclr(&one->oid);
3232 return;
3233 }
3234 if (lstat(one->path, &st) < 0)
3235 die_errno("stat '%s'", one->path);
3236 if (index_path(one->oid.hash, one->path, &st, 0))
3237 die("cannot hash %s", one->path);
3238 }
3239 }
3240 else
3241 oidclr(&one->oid);
3242 }
3243
3244 static void strip_prefix(int prefix_length, const char **namep, const char **otherp)
3245 {
3246 /* Strip the prefix but do not molest /dev/null and absolute paths */
3247 if (*namep && **namep != '/') {
3248 *namep += prefix_length;
3249 if (**namep == '/')
3250 ++*namep;
3251 }
3252 if (*otherp && **otherp != '/') {
3253 *otherp += prefix_length;
3254 if (**otherp == '/')
3255 ++*otherp;
3256 }
3257 }
3258
3259 static void run_diff(struct diff_filepair *p, struct diff_options *o)
3260 {
3261 const char *pgm = external_diff();
3262 struct strbuf msg;
3263 struct diff_filespec *one = p->one;
3264 struct diff_filespec *two = p->two;
3265 const char *name;
3266 const char *other;
3267 const char *attr_path;
3268
3269 name = p->one->path;
3270 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3271 attr_path = name;
3272 if (o->prefix_length)
3273 strip_prefix(o->prefix_length, &name, &other);
3274
3275 if (!DIFF_OPT_TST(o, ALLOW_EXTERNAL))
3276 pgm = NULL;
3277
3278 if (DIFF_PAIR_UNMERGED(p)) {
3279 run_diff_cmd(pgm, name, NULL, attr_path,
3280 NULL, NULL, NULL, o, p);
3281 return;
3282 }
3283
3284 diff_fill_sha1_info(one);
3285 diff_fill_sha1_info(two);
3286
3287 if (!pgm &&
3288 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
3289 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
3290 /*
3291 * a filepair that changes between file and symlink
3292 * needs to be split into deletion and creation.
3293 */
3294 struct diff_filespec *null = alloc_filespec(two->path);
3295 run_diff_cmd(NULL, name, other, attr_path,
3296 one, null, &msg, o, p);
3297 free(null);
3298 strbuf_release(&msg);
3299
3300 null = alloc_filespec(one->path);
3301 run_diff_cmd(NULL, name, other, attr_path,
3302 null, two, &msg, o, p);
3303 free(null);
3304 }
3305 else
3306 run_diff_cmd(pgm, name, other, attr_path,
3307 one, two, &msg, o, p);
3308
3309 strbuf_release(&msg);
3310 }
3311
3312 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
3313 struct diffstat_t *diffstat)
3314 {
3315 const char *name;
3316 const char *other;
3317
3318 if (DIFF_PAIR_UNMERGED(p)) {
3319 /* unmerged */
3320 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, p);
3321 return;
3322 }
3323
3324 name = p->one->path;
3325 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3326
3327 if (o->prefix_length)
3328 strip_prefix(o->prefix_length, &name, &other);
3329
3330 diff_fill_sha1_info(p->one);
3331 diff_fill_sha1_info(p->two);
3332
3333 builtin_diffstat(name, other, p->one, p->two, diffstat, o, p);
3334 }
3335
3336 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
3337 {
3338 const char *name;
3339 const char *other;
3340 const char *attr_path;
3341
3342 if (DIFF_PAIR_UNMERGED(p)) {
3343 /* unmerged */
3344 return;
3345 }
3346
3347 name = p->one->path;
3348 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3349 attr_path = other ? other : name;
3350
3351 if (o->prefix_length)
3352 strip_prefix(o->prefix_length, &name, &other);
3353
3354 diff_fill_sha1_info(p->one);
3355 diff_fill_sha1_info(p->two);
3356
3357 builtin_checkdiff(name, other, attr_path, p->one, p->two, o);
3358 }
3359
3360 void diff_setup(struct diff_options *options)
3361 {
3362 memcpy(options, &default_diff_options, sizeof(*options));
3363
3364 options->file = stdout;
3365
3366 options->abbrev = DEFAULT_ABBREV;
3367 options->line_termination = '\n';
3368 options->break_opt = -1;
3369 options->rename_limit = -1;
3370 options->dirstat_permille = diff_dirstat_permille_default;
3371 options->context = diff_context_default;
3372 options->interhunkcontext = diff_interhunk_context_default;
3373 options->ws_error_highlight = ws_error_highlight_default;
3374 DIFF_OPT_SET(options, RENAME_EMPTY);
3375
3376 /* pathchange left =NULL by default */
3377 options->change = diff_change;
3378 options->add_remove = diff_addremove;
3379 options->use_color = diff_use_color_default;
3380 options->detect_rename = diff_detect_rename_default;
3381 options->xdl_opts |= diff_algorithm;
3382 if (diff_indent_heuristic)
3383 DIFF_XDL_SET(options, INDENT_HEURISTIC);
3384
3385 options->orderfile = diff_order_file_cfg;
3386
3387 if (diff_no_prefix) {
3388 options->a_prefix = options->b_prefix = "";
3389 } else if (!diff_mnemonic_prefix) {
3390 options->a_prefix = "a/";
3391 options->b_prefix = "b/";
3392 }
3393 }
3394
3395 void diff_setup_done(struct diff_options *options)
3396 {
3397 int count = 0;
3398
3399 if (options->set_default)
3400 options->set_default(options);
3401
3402 if (options->output_format & DIFF_FORMAT_NAME)
3403 count++;
3404 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
3405 count++;
3406 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
3407 count++;
3408 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
3409 count++;
3410 if (count > 1)
3411 die(_("--name-only, --name-status, --check and -s are mutually exclusive"));
3412
3413 /*
3414 * Most of the time we can say "there are changes"
3415 * only by checking if there are changed paths, but
3416 * --ignore-whitespace* options force us to look
3417 * inside contents.
3418 */
3419
3420 if (DIFF_XDL_TST(options, IGNORE_WHITESPACE) ||
3421 DIFF_XDL_TST(options, IGNORE_WHITESPACE_CHANGE) ||
3422 DIFF_XDL_TST(options, IGNORE_WHITESPACE_AT_EOL))
3423 DIFF_OPT_SET(options, DIFF_FROM_CONTENTS);
3424 else
3425 DIFF_OPT_CLR(options, DIFF_FROM_CONTENTS);
3426
3427 if (DIFF_OPT_TST(options, FIND_COPIES_HARDER))
3428 options->detect_rename = DIFF_DETECT_COPY;
3429
3430 if (!DIFF_OPT_TST(options, RELATIVE_NAME))
3431 options->prefix = NULL;
3432 if (options->prefix)
3433 options->prefix_length = strlen(options->prefix);
3434 else
3435 options->prefix_length = 0;
3436
3437 if (options->output_format & (DIFF_FORMAT_NAME |
3438 DIFF_FORMAT_NAME_STATUS |
3439 DIFF_FORMAT_CHECKDIFF |
3440 DIFF_FORMAT_NO_OUTPUT))
3441 options->output_format &= ~(DIFF_FORMAT_RAW |
3442 DIFF_FORMAT_NUMSTAT |
3443 DIFF_FORMAT_DIFFSTAT |
3444 DIFF_FORMAT_SHORTSTAT |
3445 DIFF_FORMAT_DIRSTAT |
3446 DIFF_FORMAT_SUMMARY |
3447 DIFF_FORMAT_PATCH);
3448
3449 /*
3450 * These cases always need recursive; we do not drop caller-supplied
3451 * recursive bits for other formats here.
3452 */
3453 if (options->output_format & (DIFF_FORMAT_PATCH |
3454 DIFF_FORMAT_NUMSTAT |
3455 DIFF_FORMAT_DIFFSTAT |
3456 DIFF_FORMAT_SHORTSTAT |
3457 DIFF_FORMAT_DIRSTAT |
3458 DIFF_FORMAT_SUMMARY |
3459 DIFF_FORMAT_CHECKDIFF))
3460 DIFF_OPT_SET(options, RECURSIVE);
3461 /*
3462 * Also pickaxe would not work very well if you do not say recursive
3463 */
3464 if (options->pickaxe)
3465 DIFF_OPT_SET(options, RECURSIVE);
3466 /*
3467 * When patches are generated, submodules diffed against the work tree
3468 * must be checked for dirtiness too so it can be shown in the output
3469 */
3470 if (options->output_format & DIFF_FORMAT_PATCH)
3471 DIFF_OPT_SET(options, DIRTY_SUBMODULES);
3472
3473 if (options->detect_rename && options->rename_limit < 0)
3474 options->rename_limit = diff_rename_limit_default;
3475 if (options->setup & DIFF_SETUP_USE_CACHE) {
3476 if (!active_cache)
3477 /* read-cache does not die even when it fails
3478 * so it is safe for us to do this here. Also
3479 * it does not smudge active_cache or active_nr
3480 * when it fails, so we do not have to worry about
3481 * cleaning it up ourselves either.
3482 */
3483 read_cache();
3484 }
3485 if (40 < options->abbrev)
3486 options->abbrev = 40; /* full */
3487
3488 /*
3489 * It does not make sense to show the first hit we happened
3490 * to have found. It does not make sense not to return with
3491 * exit code in such a case either.
3492 */
3493 if (DIFF_OPT_TST(options, QUICK)) {
3494 options->output_format = DIFF_FORMAT_NO_OUTPUT;
3495 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
3496 }
3497
3498 options->diff_path_counter = 0;
3499
3500 if (DIFF_OPT_TST(options, FOLLOW_RENAMES) && options->pathspec.nr != 1)
3501 die(_("--follow requires exactly one pathspec"));
3502 }
3503
3504 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
3505 {
3506 char c, *eq;
3507 int len;
3508
3509 if (*arg != '-')
3510 return 0;
3511 c = *++arg;
3512 if (!c)
3513 return 0;
3514 if (c == arg_short) {
3515 c = *++arg;
3516 if (!c)
3517 return 1;
3518 if (val && isdigit(c)) {
3519 char *end;
3520 int n = strtoul(arg, &end, 10);
3521 if (*end)
3522 return 0;
3523 *val = n;
3524 return 1;
3525 }
3526 return 0;
3527 }
3528 if (c != '-')
3529 return 0;
3530 arg++;
3531 eq = strchrnul(arg, '=');
3532 len = eq - arg;
3533 if (!len || strncmp(arg, arg_long, len))
3534 return 0;
3535 if (*eq) {
3536 int n;
3537 char *end;
3538 if (!isdigit(*++eq))
3539 return 0;
3540 n = strtoul(eq, &end, 10);
3541 if (*end)
3542 return 0;
3543 *val = n;
3544 }
3545 return 1;
3546 }
3547
3548 static int diff_scoreopt_parse(const char *opt);
3549
3550 static inline int short_opt(char opt, const char **argv,
3551 const char **optarg)
3552 {
3553 const char *arg = argv[0];
3554 if (arg[0] != '-' || arg[1] != opt)
3555 return 0;
3556 if (arg[2] != '\0') {
3557 *optarg = arg + 2;
3558 return 1;
3559 }
3560 if (!argv[1])
3561 die("Option '%c' requires a value", opt);
3562 *optarg = argv[1];
3563 return 2;
3564 }
3565
3566 int parse_long_opt(const char *opt, const char **argv,
3567 const char **optarg)
3568 {
3569 const char *arg = argv[0];
3570 if (!skip_prefix(arg, "--", &arg))
3571 return 0;
3572 if (!skip_prefix(arg, opt, &arg))
3573 return 0;
3574 if (*arg == '=') { /* stuck form: --option=value */
3575 *optarg = arg + 1;
3576 return 1;
3577 }
3578 if (*arg != '\0')
3579 return 0;
3580 /* separate form: --option value */
3581 if (!argv[1])
3582 die("Option '--%s' requires a value", opt);
3583 *optarg = argv[1];
3584 return 2;
3585 }
3586
3587 static int stat_opt(struct diff_options *options, const char **av)
3588 {
3589 const char *arg = av[0];
3590 char *end;
3591 int width = options->stat_width;
3592 int name_width = options->stat_name_width;
3593 int graph_width = options->stat_graph_width;
3594 int count = options->stat_count;
3595 int argcount = 1;
3596
3597 if (!skip_prefix(arg, "--stat", &arg))
3598 die("BUG: stat option does not begin with --stat: %s", arg);
3599 end = (char *)arg;
3600
3601 switch (*arg) {
3602 case '-':
3603 if (skip_prefix(arg, "-width", &arg)) {
3604 if (*arg == '=')
3605 width = strtoul(arg + 1, &end, 10);
3606 else if (!*arg && !av[1])
3607 die_want_option("--stat-width");
3608 else if (!*arg) {
3609 width = strtoul(av[1], &end, 10);
3610 argcount = 2;
3611 }
3612 } else if (skip_prefix(arg, "-name-width", &arg)) {
3613 if (*arg == '=')
3614 name_width = strtoul(arg + 1, &end, 10);
3615 else if (!*arg && !av[1])
3616 die_want_option("--stat-name-width");
3617 else if (!*arg) {
3618 name_width = strtoul(av[1], &end, 10);
3619 argcount = 2;
3620 }
3621 } else if (skip_prefix(arg, "-graph-width", &arg)) {
3622 if (*arg == '=')
3623 graph_width = strtoul(arg + 1, &end, 10);
3624 else if (!*arg && !av[1])
3625 die_want_option("--stat-graph-width");
3626 else if (!*arg) {
3627 graph_width = strtoul(av[1], &end, 10);
3628 argcount = 2;
3629 }
3630 } else if (skip_prefix(arg, "-count", &arg)) {
3631 if (*arg == '=')
3632 count = strtoul(arg + 1, &end, 10);
3633 else if (!*arg && !av[1])
3634 die_want_option("--stat-count");
3635 else if (!*arg) {
3636 count = strtoul(av[1], &end, 10);
3637 argcount = 2;
3638 }
3639 }
3640 break;
3641 case '=':
3642 width = strtoul(arg+1, &end, 10);
3643 if (*end == ',')
3644 name_width = strtoul(end+1, &end, 10);
3645 if (*end == ',')
3646 count = strtoul(end+1, &end, 10);
3647 }
3648
3649 /* Important! This checks all the error cases! */
3650 if (*end)
3651 return 0;
3652 options->output_format |= DIFF_FORMAT_DIFFSTAT;
3653 options->stat_name_width = name_width;
3654 options->stat_graph_width = graph_width;
3655 options->stat_width = width;
3656 options->stat_count = count;
3657 return argcount;
3658 }
3659
3660 static int parse_dirstat_opt(struct diff_options *options, const char *params)
3661 {
3662 struct strbuf errmsg = STRBUF_INIT;
3663 if (parse_dirstat_params(options, params, &errmsg))
3664 die(_("Failed to parse --dirstat/-X option parameter:\n%s"),
3665 errmsg.buf);
3666 strbuf_release(&errmsg);
3667 /*
3668 * The caller knows a dirstat-related option is given from the command
3669 * line; allow it to say "return this_function();"
3670 */
3671 options->output_format |= DIFF_FORMAT_DIRSTAT;
3672 return 1;
3673 }
3674
3675 static int parse_submodule_opt(struct diff_options *options, const char *value)
3676 {
3677 if (parse_submodule_params(options, value))
3678 die(_("Failed to parse --submodule option parameter: '%s'"),
3679 value);
3680 return 1;
3681 }
3682
3683 static const char diff_status_letters[] = {
3684 DIFF_STATUS_ADDED,
3685 DIFF_STATUS_COPIED,
3686 DIFF_STATUS_DELETED,
3687 DIFF_STATUS_MODIFIED,
3688 DIFF_STATUS_RENAMED,
3689 DIFF_STATUS_TYPE_CHANGED,
3690 DIFF_STATUS_UNKNOWN,
3691 DIFF_STATUS_UNMERGED,
3692 DIFF_STATUS_FILTER_AON,
3693 DIFF_STATUS_FILTER_BROKEN,
3694 '\0',
3695 };
3696
3697 static unsigned int filter_bit['Z' + 1];
3698
3699 static void prepare_filter_bits(void)
3700 {
3701 int i;
3702
3703 if (!filter_bit[DIFF_STATUS_ADDED]) {
3704 for (i = 0; diff_status_letters[i]; i++)
3705 filter_bit[(int) diff_status_letters[i]] = (1 << i);
3706 }
3707 }
3708
3709 static unsigned filter_bit_tst(char status, const struct diff_options *opt)
3710 {
3711 return opt->filter & filter_bit[(int) status];
3712 }
3713
3714 static int parse_diff_filter_opt(const char *optarg, struct diff_options *opt)
3715 {
3716 int i, optch;
3717
3718 prepare_filter_bits();
3719
3720 /*
3721 * If there is a negation e.g. 'd' in the input, and we haven't
3722 * initialized the filter field with another --diff-filter, start
3723 * from full set of bits, except for AON.
3724 */
3725 if (!opt->filter) {
3726 for (i = 0; (optch = optarg[i]) != '\0'; i++) {
3727 if (optch < 'a' || 'z' < optch)
3728 continue;
3729 opt->filter = (1 << (ARRAY_SIZE(diff_status_letters) - 1)) - 1;
3730 opt->filter &= ~filter_bit[DIFF_STATUS_FILTER_AON];
3731 break;
3732 }
3733 }
3734
3735 for (i = 0; (optch = optarg[i]) != '\0'; i++) {
3736 unsigned int bit;
3737 int negate;
3738
3739 if ('a' <= optch && optch <= 'z') {
3740 negate = 1;
3741 optch = toupper(optch);
3742 } else {
3743 negate = 0;
3744 }
3745
3746 bit = (0 <= optch && optch <= 'Z') ? filter_bit[optch] : 0;
3747 if (!bit)
3748 return optarg[i];
3749 if (negate)
3750 opt->filter &= ~bit;
3751 else
3752 opt->filter |= bit;
3753 }
3754 return 0;
3755 }
3756
3757 static void enable_patch_output(int *fmt) {
3758 *fmt &= ~DIFF_FORMAT_NO_OUTPUT;
3759 *fmt |= DIFF_FORMAT_PATCH;
3760 }
3761
3762 static int parse_ws_error_highlight_opt(struct diff_options *opt, const char *arg)
3763 {
3764 int val = parse_ws_error_highlight(arg);
3765
3766 if (val < 0) {
3767 error("unknown value after ws-error-highlight=%.*s",
3768 -1 - val, arg);
3769 return 0;
3770 }
3771 opt->ws_error_highlight = val;
3772 return 1;
3773 }
3774
3775 int diff_opt_parse(struct diff_options *options,
3776 const char **av, int ac, const char *prefix)
3777 {
3778 const char *arg = av[0];
3779 const char *optarg;
3780 int argcount;
3781
3782 if (!prefix)
3783 prefix = "";
3784
3785 /* Output format options */
3786 if (!strcmp(arg, "-p") || !strcmp(arg, "-u") || !strcmp(arg, "--patch")
3787 || opt_arg(arg, 'U', "unified", &options->context))
3788 enable_patch_output(&options->output_format);
3789 else if (!strcmp(arg, "--raw"))
3790 options->output_format |= DIFF_FORMAT_RAW;
3791 else if (!strcmp(arg, "--patch-with-raw")) {
3792 enable_patch_output(&options->output_format);
3793 options->output_format |= DIFF_FORMAT_RAW;
3794 } else if (!strcmp(arg, "--numstat"))
3795 options->output_format |= DIFF_FORMAT_NUMSTAT;
3796 else if (!strcmp(arg, "--shortstat"))
3797 options->output_format |= DIFF_FORMAT_SHORTSTAT;
3798 else if (!strcmp(arg, "-X") || !strcmp(arg, "--dirstat"))
3799 return parse_dirstat_opt(options, "");
3800 else if (skip_prefix(arg, "-X", &arg))
3801 return parse_dirstat_opt(options, arg);
3802 else if (skip_prefix(arg, "--dirstat=", &arg))
3803 return parse_dirstat_opt(options, arg);
3804 else if (!strcmp(arg, "--cumulative"))
3805 return parse_dirstat_opt(options, "cumulative");
3806 else if (!strcmp(arg, "--dirstat-by-file"))
3807 return parse_dirstat_opt(options, "files");
3808 else if (skip_prefix(arg, "--dirstat-by-file=", &arg)) {
3809 parse_dirstat_opt(options, "files");
3810 return parse_dirstat_opt(options, arg);
3811 }
3812 else if (!strcmp(arg, "--check"))
3813 options->output_format |= DIFF_FORMAT_CHECKDIFF;
3814 else if (!strcmp(arg, "--summary"))
3815 options->output_format |= DIFF_FORMAT_SUMMARY;
3816 else if (!strcmp(arg, "--patch-with-stat")) {
3817 enable_patch_output(&options->output_format);
3818 options->output_format |= DIFF_FORMAT_DIFFSTAT;
3819 } else if (!strcmp(arg, "--name-only"))
3820 options->output_format |= DIFF_FORMAT_NAME;
3821 else if (!strcmp(arg, "--name-status"))
3822 options->output_format |= DIFF_FORMAT_NAME_STATUS;
3823 else if (!strcmp(arg, "-s") || !strcmp(arg, "--no-patch"))
3824 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
3825 else if (starts_with(arg, "--stat"))
3826 /* --stat, --stat-width, --stat-name-width, or --stat-count */
3827 return stat_opt(options, av);
3828
3829 /* renames options */
3830 else if (starts_with(arg, "-B") || starts_with(arg, "--break-rewrites=") ||
3831 !strcmp(arg, "--break-rewrites")) {
3832 if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
3833 return error("invalid argument to -B: %s", arg+2);
3834 }
3835 else if (starts_with(arg, "-M") || starts_with(arg, "--find-renames=") ||
3836 !strcmp(arg, "--find-renames")) {
3837 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
3838 return error("invalid argument to -M: %s", arg+2);
3839 options->detect_rename = DIFF_DETECT_RENAME;
3840 }
3841 else if (!strcmp(arg, "-D") || !strcmp(arg, "--irreversible-delete")) {
3842 options->irreversible_delete = 1;
3843 }
3844 else if (starts_with(arg, "-C") || starts_with(arg, "--find-copies=") ||
3845 !strcmp(arg, "--find-copies")) {
3846 if (options->detect_rename == DIFF_DETECT_COPY)
3847 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3848 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
3849 return error("invalid argument to -C: %s", arg+2);
3850 options->detect_rename = DIFF_DETECT_COPY;
3851 }
3852 else if (!strcmp(arg, "--no-renames"))
3853 options->detect_rename = 0;
3854 else if (!strcmp(arg, "--rename-empty"))
3855 DIFF_OPT_SET(options, RENAME_EMPTY);
3856 else if (!strcmp(arg, "--no-rename-empty"))
3857 DIFF_OPT_CLR(options, RENAME_EMPTY);
3858 else if (!strcmp(arg, "--relative"))
3859 DIFF_OPT_SET(options, RELATIVE_NAME);
3860 else if (skip_prefix(arg, "--relative=", &arg)) {
3861 DIFF_OPT_SET(options, RELATIVE_NAME);
3862 options->prefix = arg;
3863 }
3864
3865 /* xdiff options */
3866 else if (!strcmp(arg, "--minimal"))
3867 DIFF_XDL_SET(options, NEED_MINIMAL);
3868 else if (!strcmp(arg, "--no-minimal"))
3869 DIFF_XDL_CLR(options, NEED_MINIMAL);
3870 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
3871 DIFF_XDL_SET(options, IGNORE_WHITESPACE);
3872 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
3873 DIFF_XDL_SET(options, IGNORE_WHITESPACE_CHANGE);
3874 else if (!strcmp(arg, "--ignore-space-at-eol"))
3875 DIFF_XDL_SET(options, IGNORE_WHITESPACE_AT_EOL);
3876 else if (!strcmp(arg, "--ignore-blank-lines"))
3877 DIFF_XDL_SET(options, IGNORE_BLANK_LINES);
3878 else if (!strcmp(arg, "--indent-heuristic"))
3879 DIFF_XDL_SET(options, INDENT_HEURISTIC);
3880 else if (!strcmp(arg, "--no-indent-heuristic"))
3881 DIFF_XDL_CLR(options, INDENT_HEURISTIC);
3882 else if (!strcmp(arg, "--patience"))
3883 options->xdl_opts = DIFF_WITH_ALG(options, PATIENCE_DIFF);
3884 else if (!strcmp(arg, "--histogram"))
3885 options->xdl_opts = DIFF_WITH_ALG(options, HISTOGRAM_DIFF);
3886 else if ((argcount = parse_long_opt("diff-algorithm", av, &optarg))) {
3887 long value = parse_algorithm_value(optarg);
3888 if (value < 0)
3889 return error("option diff-algorithm accepts \"myers\", "
3890 "\"minimal\", \"patience\" and \"histogram\"");
3891 /* clear out previous settings */
3892 DIFF_XDL_CLR(options, NEED_MINIMAL);
3893 options->xdl_opts &= ~XDF_DIFF_ALGORITHM_MASK;
3894 options->xdl_opts |= value;
3895 return argcount;
3896 }
3897
3898 /* flags options */
3899 else if (!strcmp(arg, "--binary")) {
3900 enable_patch_output(&options->output_format);
3901 DIFF_OPT_SET(options, BINARY);
3902 }
3903 else if (!strcmp(arg, "--full-index"))
3904 DIFF_OPT_SET(options, FULL_INDEX);
3905 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
3906 DIFF_OPT_SET(options, TEXT);
3907 else if (!strcmp(arg, "-R"))
3908 DIFF_OPT_SET(options, REVERSE_DIFF);
3909 else if (!strcmp(arg, "--find-copies-harder"))
3910 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3911 else if (!strcmp(arg, "--follow"))
3912 DIFF_OPT_SET(options, FOLLOW_RENAMES);
3913 else if (!strcmp(arg, "--no-follow")) {
3914 DIFF_OPT_CLR(options, FOLLOW_RENAMES);
3915 DIFF_OPT_CLR(options, DEFAULT_FOLLOW_RENAMES);
3916 } else if (!strcmp(arg, "--color"))
3917 options->use_color = 1;
3918 else if (skip_prefix(arg, "--color=", &arg)) {
3919 int value = git_config_colorbool(NULL, arg);
3920 if (value < 0)
3921 return error("option `color' expects \"always\", \"auto\", or \"never\"");
3922 options->use_color = value;
3923 }
3924 else if (!strcmp(arg, "--no-color"))
3925 options->use_color = 0;
3926 else if (!strcmp(arg, "--color-words")) {
3927 options->use_color = 1;
3928 options->word_diff = DIFF_WORDS_COLOR;
3929 }
3930 else if (skip_prefix(arg, "--color-words=", &arg)) {
3931 options->use_color = 1;
3932 options->word_diff = DIFF_WORDS_COLOR;
3933 options->word_regex = arg;
3934 }
3935 else if (!strcmp(arg, "--word-diff")) {
3936 if (options->word_diff == DIFF_WORDS_NONE)
3937 options->word_diff = DIFF_WORDS_PLAIN;
3938 }
3939 else if (skip_prefix(arg, "--word-diff=", &arg)) {
3940 if (!strcmp(arg, "plain"))
3941 options->word_diff = DIFF_WORDS_PLAIN;
3942 else if (!strcmp(arg, "color")) {
3943 options->use_color = 1;
3944 options->word_diff = DIFF_WORDS_COLOR;
3945 }
3946 else if (!strcmp(arg, "porcelain"))
3947 options->word_diff = DIFF_WORDS_PORCELAIN;
3948 else if (!strcmp(arg, "none"))
3949 options->word_diff = DIFF_WORDS_NONE;
3950 else
3951 die("bad --word-diff argument: %s", arg);
3952 }
3953 else if ((argcount = parse_long_opt("word-diff-regex", av, &optarg))) {
3954 if (options->word_diff == DIFF_WORDS_NONE)
3955 options->word_diff = DIFF_WORDS_PLAIN;
3956 options->word_regex = optarg;
3957 return argcount;
3958 }
3959 else if (!strcmp(arg, "--exit-code"))
3960 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
3961 else if (!strcmp(arg, "--quiet"))
3962 DIFF_OPT_SET(options, QUICK);
3963 else if (!strcmp(arg, "--ext-diff"))
3964 DIFF_OPT_SET(options, ALLOW_EXTERNAL);
3965 else if (!strcmp(arg, "--no-ext-diff"))
3966 DIFF_OPT_CLR(options, ALLOW_EXTERNAL);
3967 else if (!strcmp(arg, "--textconv"))
3968 DIFF_OPT_SET(options, ALLOW_TEXTCONV);
3969 else if (!strcmp(arg, "--no-textconv"))
3970 DIFF_OPT_CLR(options, ALLOW_TEXTCONV);
3971 else if (!strcmp(arg, "--ignore-submodules")) {
3972 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
3973 handle_ignore_submodules_arg(options, "all");
3974 } else if (skip_prefix(arg, "--ignore-submodules=", &arg)) {
3975 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
3976 handle_ignore_submodules_arg(options, arg);
3977 } else if (!strcmp(arg, "--submodule"))
3978 options->submodule_format = DIFF_SUBMODULE_LOG;
3979 else if (skip_prefix(arg, "--submodule=", &arg))
3980 return parse_submodule_opt(options, arg);
3981 else if (skip_prefix(arg, "--ws-error-highlight=", &arg))
3982 return parse_ws_error_highlight_opt(options, arg);
3983 else if (!strcmp(arg, "--ita-invisible-in-index"))
3984 options->ita_invisible_in_index = 1;
3985 else if (!strcmp(arg, "--ita-visible-in-index"))
3986 options->ita_invisible_in_index = 0;
3987
3988 /* misc options */
3989 else if (!strcmp(arg, "-z"))
3990 options->line_termination = 0;
3991 else if ((argcount = short_opt('l', av, &optarg))) {
3992 options->rename_limit = strtoul(optarg, NULL, 10);
3993 return argcount;
3994 }
3995 else if ((argcount = short_opt('S', av, &optarg))) {
3996 options->pickaxe = optarg;
3997 options->pickaxe_opts |= DIFF_PICKAXE_KIND_S;
3998 return argcount;
3999 } else if ((argcount = short_opt('G', av, &optarg))) {
4000 options->pickaxe = optarg;
4001 options->pickaxe_opts |= DIFF_PICKAXE_KIND_G;
4002 return argcount;
4003 }
4004 else if (!strcmp(arg, "--pickaxe-all"))
4005 options->pickaxe_opts |= DIFF_PICKAXE_ALL;
4006 else if (!strcmp(arg, "--pickaxe-regex"))
4007 options->pickaxe_opts |= DIFF_PICKAXE_REGEX;
4008 else if ((argcount = short_opt('O', av, &optarg))) {
4009 const char *path = prefix_filename(prefix, strlen(prefix), optarg);
4010 options->orderfile = xstrdup(path);
4011 return argcount;
4012 }
4013 else if ((argcount = parse_long_opt("diff-filter", av, &optarg))) {
4014 int offending = parse_diff_filter_opt(optarg, options);
4015 if (offending)
4016 die("unknown change class '%c' in --diff-filter=%s",
4017 offending, optarg);
4018 return argcount;
4019 }
4020 else if (!strcmp(arg, "--no-abbrev"))
4021 options->abbrev = 0;
4022 else if (!strcmp(arg, "--abbrev"))
4023 options->abbrev = DEFAULT_ABBREV;
4024 else if (skip_prefix(arg, "--abbrev=", &arg)) {
4025 options->abbrev = strtoul(arg, NULL, 10);
4026 if (options->abbrev < MINIMUM_ABBREV)
4027 options->abbrev = MINIMUM_ABBREV;
4028 else if (40 < options->abbrev)
4029 options->abbrev = 40;
4030 }
4031 else if ((argcount = parse_long_opt("src-prefix", av, &optarg))) {
4032 options->a_prefix = optarg;
4033 return argcount;
4034 }
4035 else if ((argcount = parse_long_opt("line-prefix", av, &optarg))) {
4036 options->line_prefix = optarg;
4037 options->line_prefix_length = strlen(options->line_prefix);
4038 graph_setup_line_prefix(options);
4039 return argcount;
4040 }
4041 else if ((argcount = parse_long_opt("dst-prefix", av, &optarg))) {
4042 options->b_prefix = optarg;
4043 return argcount;
4044 }
4045 else if (!strcmp(arg, "--no-prefix"))
4046 options->a_prefix = options->b_prefix = "";
4047 else if (opt_arg(arg, '\0', "inter-hunk-context",
4048 &options->interhunkcontext))
4049 ;
4050 else if (!strcmp(arg, "-W"))
4051 DIFF_OPT_SET(options, FUNCCONTEXT);
4052 else if (!strcmp(arg, "--function-context"))
4053 DIFF_OPT_SET(options, FUNCCONTEXT);
4054 else if (!strcmp(arg, "--no-function-context"))
4055 DIFF_OPT_CLR(options, FUNCCONTEXT);
4056 else if ((argcount = parse_long_opt("output", av, &optarg))) {
4057 const char *path = prefix_filename(prefix, strlen(prefix), optarg);
4058 options->file = fopen(path, "w");
4059 if (!options->file)
4060 die_errno("Could not open '%s'", path);
4061 options->close_file = 1;
4062 if (options->use_color != GIT_COLOR_ALWAYS)
4063 options->use_color = GIT_COLOR_NEVER;
4064 return argcount;
4065 } else
4066 return 0;
4067 return 1;
4068 }
4069
4070 int parse_rename_score(const char **cp_p)
4071 {
4072 unsigned long num, scale;
4073 int ch, dot;
4074 const char *cp = *cp_p;
4075
4076 num = 0;
4077 scale = 1;
4078 dot = 0;
4079 for (;;) {
4080 ch = *cp;
4081 if ( !dot && ch == '.' ) {
4082 scale = 1;
4083 dot = 1;
4084 } else if ( ch == '%' ) {
4085 scale = dot ? scale*100 : 100;
4086 cp++; /* % is always at the end */
4087 break;
4088 } else if ( ch >= '0' && ch <= '9' ) {
4089 if ( scale < 100000 ) {
4090 scale *= 10;
4091 num = (num*10) + (ch-'0');
4092 }
4093 } else {
4094 break;
4095 }
4096 cp++;
4097 }
4098 *cp_p = cp;
4099
4100 /* user says num divided by scale and we say internally that
4101 * is MAX_SCORE * num / scale.
4102 */
4103 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
4104 }
4105
4106 static int diff_scoreopt_parse(const char *opt)
4107 {
4108 int opt1, opt2, cmd;
4109
4110 if (*opt++ != '-')
4111 return -1;
4112 cmd = *opt++;
4113 if (cmd == '-') {
4114 /* convert the long-form arguments into short-form versions */
4115 if (skip_prefix(opt, "break-rewrites", &opt)) {
4116 if (*opt == 0 || *opt++ == '=')
4117 cmd = 'B';
4118 } else if (skip_prefix(opt, "find-copies", &opt)) {
4119 if (*opt == 0 || *opt++ == '=')
4120 cmd = 'C';
4121 } else if (skip_prefix(opt, "find-renames", &opt)) {
4122 if (*opt == 0 || *opt++ == '=')
4123 cmd = 'M';
4124 }
4125 }
4126 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
4127 return -1; /* that is not a -M, -C, or -B option */
4128
4129 opt1 = parse_rename_score(&opt);
4130 if (cmd != 'B')
4131 opt2 = 0;
4132 else {
4133 if (*opt == 0)
4134 opt2 = 0;
4135 else if (*opt != '/')
4136 return -1; /* we expect -B80/99 or -B80 */
4137 else {
4138 opt++;
4139 opt2 = parse_rename_score(&opt);
4140 }
4141 }
4142 if (*opt != 0)
4143 return -1;
4144 return opt1 | (opt2 << 16);
4145 }
4146
4147 struct diff_queue_struct diff_queued_diff;
4148
4149 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
4150 {
4151 ALLOC_GROW(queue->queue, queue->nr + 1, queue->alloc);
4152 queue->queue[queue->nr++] = dp;
4153 }
4154
4155 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
4156 struct diff_filespec *one,
4157 struct diff_filespec *two)
4158 {
4159 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
4160 dp->one = one;
4161 dp->two = two;
4162 if (queue)
4163 diff_q(queue, dp);
4164 return dp;
4165 }
4166
4167 void diff_free_filepair(struct diff_filepair *p)
4168 {
4169 free_filespec(p->one);
4170 free_filespec(p->two);
4171 free(p);
4172 }
4173
4174 const char *diff_aligned_abbrev(const struct object_id *oid, int len)
4175 {
4176 int abblen;
4177 const char *abbrev;
4178
4179 if (len == GIT_SHA1_HEXSZ)
4180 return oid_to_hex(oid);
4181
4182 abbrev = diff_abbrev_oid(oid, len);
4183 abblen = strlen(abbrev);
4184
4185 /*
4186 * In well-behaved cases, where the abbbreviated result is the
4187 * same as the requested length, append three dots after the
4188 * abbreviation (hence the whole logic is limited to the case
4189 * where abblen < 37); when the actual abbreviated result is a
4190 * bit longer than the requested length, we reduce the number
4191 * of dots so that they match the well-behaved ones. However,
4192 * if the actual abbreviation is longer than the requested
4193 * length by more than three, we give up on aligning, and add
4194 * three dots anyway, to indicate that the output is not the
4195 * full object name. Yes, this may be suboptimal, but this
4196 * appears only in "diff --raw --abbrev" output and it is not
4197 * worth the effort to change it now. Note that this would
4198 * likely to work fine when the automatic sizing of default
4199 * abbreviation length is used--we would be fed -1 in "len" in
4200 * that case, and will end up always appending three-dots, but
4201 * the automatic sizing is supposed to give abblen that ensures
4202 * uniqueness across all objects (statistically speaking).
4203 */
4204 if (abblen < GIT_SHA1_HEXSZ - 3) {
4205 static char hex[GIT_SHA1_HEXSZ + 1];
4206 if (len < abblen && abblen <= len + 2)
4207 xsnprintf(hex, sizeof(hex), "%s%.*s", abbrev, len+3-abblen, "..");
4208 else
4209 xsnprintf(hex, sizeof(hex), "%s...", abbrev);
4210 return hex;
4211 }
4212
4213 return oid_to_hex(oid);
4214 }
4215
4216 static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
4217 {
4218 int line_termination = opt->line_termination;
4219 int inter_name_termination = line_termination ? '\t' : '\0';
4220
4221 fprintf(opt->file, "%s", diff_line_prefix(opt));
4222 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
4223 fprintf(opt->file, ":%06o %06o %s ", p->one->mode, p->two->mode,
4224 diff_aligned_abbrev(&p->one->oid, opt->abbrev));
4225 fprintf(opt->file, "%s ",
4226 diff_aligned_abbrev(&p->two->oid, opt->abbrev));
4227 }
4228 if (p->score) {
4229 fprintf(opt->file, "%c%03d%c", p->status, similarity_index(p),
4230 inter_name_termination);
4231 } else {
4232 fprintf(opt->file, "%c%c", p->status, inter_name_termination);
4233 }
4234
4235 if (p->status == DIFF_STATUS_COPIED ||
4236 p->status == DIFF_STATUS_RENAMED) {
4237 const char *name_a, *name_b;
4238 name_a = p->one->path;
4239 name_b = p->two->path;
4240 strip_prefix(opt->prefix_length, &name_a, &name_b);
4241 write_name_quoted(name_a, opt->file, inter_name_termination);
4242 write_name_quoted(name_b, opt->file, line_termination);
4243 } else {
4244 const char *name_a, *name_b;
4245 name_a = p->one->mode ? p->one->path : p->two->path;
4246 name_b = NULL;
4247 strip_prefix(opt->prefix_length, &name_a, &name_b);
4248 write_name_quoted(name_a, opt->file, line_termination);
4249 }
4250 }
4251
4252 int diff_unmodified_pair(struct diff_filepair *p)
4253 {
4254 /* This function is written stricter than necessary to support
4255 * the currently implemented transformers, but the idea is to
4256 * let transformers to produce diff_filepairs any way they want,
4257 * and filter and clean them up here before producing the output.
4258 */
4259 struct diff_filespec *one = p->one, *two = p->two;
4260
4261 if (DIFF_PAIR_UNMERGED(p))
4262 return 0; /* unmerged is interesting */
4263
4264 /* deletion, addition, mode or type change
4265 * and rename are all interesting.
4266 */
4267 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
4268 DIFF_PAIR_MODE_CHANGED(p) ||
4269 strcmp(one->path, two->path))
4270 return 0;
4271
4272 /* both are valid and point at the same path. that is, we are
4273 * dealing with a change.
4274 */
4275 if (one->oid_valid && two->oid_valid &&
4276 !oidcmp(&one->oid, &two->oid) &&
4277 !one->dirty_submodule && !two->dirty_submodule)
4278 return 1; /* no change */
4279 if (!one->oid_valid && !two->oid_valid)
4280 return 1; /* both look at the same file on the filesystem. */
4281 return 0;
4282 }
4283
4284 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
4285 {
4286 if (diff_unmodified_pair(p))
4287 return;
4288
4289 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4290 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4291 return; /* no tree diffs in patch format */
4292
4293 run_diff(p, o);
4294 }
4295
4296 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
4297 struct diffstat_t *diffstat)
4298 {
4299 if (diff_unmodified_pair(p))
4300 return;
4301
4302 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4303 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4304 return; /* no useful stat for tree diffs */
4305
4306 run_diffstat(p, o, diffstat);
4307 }
4308
4309 static void diff_flush_checkdiff(struct diff_filepair *p,
4310 struct diff_options *o)
4311 {
4312 if (diff_unmodified_pair(p))
4313 return;
4314
4315 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4316 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4317 return; /* nothing to check in tree diffs */
4318
4319 run_checkdiff(p, o);
4320 }
4321
4322 int diff_queue_is_empty(void)
4323 {
4324 struct diff_queue_struct *q = &diff_queued_diff;
4325 int i;
4326 for (i = 0; i < q->nr; i++)
4327 if (!diff_unmodified_pair(q->queue[i]))
4328 return 0;
4329 return 1;
4330 }
4331
4332 #if DIFF_DEBUG
4333 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
4334 {
4335 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
4336 x, one ? one : "",
4337 s->path,
4338 DIFF_FILE_VALID(s) ? "valid" : "invalid",
4339 s->mode,
4340 s->oid_valid ? oid_to_hex(&s->oid) : "");
4341 fprintf(stderr, "queue[%d] %s size %lu\n",
4342 x, one ? one : "",
4343 s->size);
4344 }
4345
4346 void diff_debug_filepair(const struct diff_filepair *p, int i)
4347 {
4348 diff_debug_filespec(p->one, i, "one");
4349 diff_debug_filespec(p->two, i, "two");
4350 fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
4351 p->score, p->status ? p->status : '?',
4352 p->one->rename_used, p->broken_pair);
4353 }
4354
4355 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
4356 {
4357 int i;
4358 if (msg)
4359 fprintf(stderr, "%s\n", msg);
4360 fprintf(stderr, "q->nr = %d\n", q->nr);
4361 for (i = 0; i < q->nr; i++) {
4362 struct diff_filepair *p = q->queue[i];
4363 diff_debug_filepair(p, i);
4364 }
4365 }
4366 #endif
4367
4368 static void diff_resolve_rename_copy(void)
4369 {
4370 int i;
4371 struct diff_filepair *p;
4372 struct diff_queue_struct *q = &diff_queued_diff;
4373
4374 diff_debug_queue("resolve-rename-copy", q);
4375
4376 for (i = 0; i < q->nr; i++) {
4377 p = q->queue[i];
4378 p->status = 0; /* undecided */
4379 if (DIFF_PAIR_UNMERGED(p))
4380 p->status = DIFF_STATUS_UNMERGED;
4381 else if (!DIFF_FILE_VALID(p->one))
4382 p->status = DIFF_STATUS_ADDED;
4383 else if (!DIFF_FILE_VALID(p->two))
4384 p->status = DIFF_STATUS_DELETED;
4385 else if (DIFF_PAIR_TYPE_CHANGED(p))
4386 p->status = DIFF_STATUS_TYPE_CHANGED;
4387
4388 /* from this point on, we are dealing with a pair
4389 * whose both sides are valid and of the same type, i.e.
4390 * either in-place edit or rename/copy edit.
4391 */
4392 else if (DIFF_PAIR_RENAME(p)) {
4393 /*
4394 * A rename might have re-connected a broken
4395 * pair up, causing the pathnames to be the
4396 * same again. If so, that's not a rename at
4397 * all, just a modification..
4398 *
4399 * Otherwise, see if this source was used for
4400 * multiple renames, in which case we decrement
4401 * the count, and call it a copy.
4402 */
4403 if (!strcmp(p->one->path, p->two->path))
4404 p->status = DIFF_STATUS_MODIFIED;
4405 else if (--p->one->rename_used > 0)
4406 p->status = DIFF_STATUS_COPIED;
4407 else
4408 p->status = DIFF_STATUS_RENAMED;
4409 }
4410 else if (oidcmp(&p->one->oid, &p->two->oid) ||
4411 p->one->mode != p->two->mode ||
4412 p->one->dirty_submodule ||
4413 p->two->dirty_submodule ||
4414 is_null_oid(&p->one->oid))
4415 p->status = DIFF_STATUS_MODIFIED;
4416 else {
4417 /* This is a "no-change" entry and should not
4418 * happen anymore, but prepare for broken callers.
4419 */
4420 error("feeding unmodified %s to diffcore",
4421 p->one->path);
4422 p->status = DIFF_STATUS_UNKNOWN;
4423 }
4424 }
4425 diff_debug_queue("resolve-rename-copy done", q);
4426 }
4427
4428 static int check_pair_status(struct diff_filepair *p)
4429 {
4430 switch (p->status) {
4431 case DIFF_STATUS_UNKNOWN:
4432 return 0;
4433 case 0:
4434 die("internal error in diff-resolve-rename-copy");
4435 default:
4436 return 1;
4437 }
4438 }
4439
4440 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
4441 {
4442 int fmt = opt->output_format;
4443
4444 if (fmt & DIFF_FORMAT_CHECKDIFF)
4445 diff_flush_checkdiff(p, opt);
4446 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
4447 diff_flush_raw(p, opt);
4448 else if (fmt & DIFF_FORMAT_NAME) {
4449 const char *name_a, *name_b;
4450 name_a = p->two->path;
4451 name_b = NULL;
4452 strip_prefix(opt->prefix_length, &name_a, &name_b);
4453 fprintf(opt->file, "%s", diff_line_prefix(opt));
4454 write_name_quoted(name_a, opt->file, opt->line_termination);
4455 }
4456 }
4457
4458 static void show_file_mode_name(FILE *file, const char *newdelete, struct diff_filespec *fs)
4459 {
4460 if (fs->mode)
4461 fprintf(file, " %s mode %06o ", newdelete, fs->mode);
4462 else
4463 fprintf(file, " %s ", newdelete);
4464 write_name_quoted(fs->path, file, '\n');
4465 }
4466
4467
4468 static void show_mode_change(FILE *file, struct diff_filepair *p, int show_name,
4469 const char *line_prefix)
4470 {
4471 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
4472 fprintf(file, "%s mode change %06o => %06o%c", line_prefix, p->one->mode,
4473 p->two->mode, show_name ? ' ' : '\n');
4474 if (show_name) {
4475 write_name_quoted(p->two->path, file, '\n');
4476 }
4477 }
4478 }
4479
4480 static void show_rename_copy(FILE *file, const char *renamecopy, struct diff_filepair *p,
4481 const char *line_prefix)
4482 {
4483 char *names = pprint_rename(p->one->path, p->two->path);
4484
4485 fprintf(file, " %s %s (%d%%)\n", renamecopy, names, similarity_index(p));
4486 free(names);
4487 show_mode_change(file, p, 0, line_prefix);
4488 }
4489
4490 static void diff_summary(struct diff_options *opt, struct diff_filepair *p)
4491 {
4492 FILE *file = opt->file;
4493 const char *line_prefix = diff_line_prefix(opt);
4494
4495 switch(p->status) {
4496 case DIFF_STATUS_DELETED:
4497 fputs(line_prefix, file);
4498 show_file_mode_name(file, "delete", p->one);
4499 break;
4500 case DIFF_STATUS_ADDED:
4501 fputs(line_prefix, file);
4502 show_file_mode_name(file, "create", p->two);
4503 break;
4504 case DIFF_STATUS_COPIED:
4505 fputs(line_prefix, file);
4506 show_rename_copy(file, "copy", p, line_prefix);
4507 break;
4508 case DIFF_STATUS_RENAMED:
4509 fputs(line_prefix, file);
4510 show_rename_copy(file, "rename", p, line_prefix);
4511 break;
4512 default:
4513 if (p->score) {
4514 fprintf(file, "%s rewrite ", line_prefix);
4515 write_name_quoted(p->two->path, file, ' ');
4516 fprintf(file, "(%d%%)\n", similarity_index(p));
4517 }
4518 show_mode_change(file, p, !p->score, line_prefix);
4519 break;
4520 }
4521 }
4522
4523 struct patch_id_t {
4524 git_SHA_CTX *ctx;
4525 int patchlen;
4526 };
4527
4528 static int remove_space(char *line, int len)
4529 {
4530 int i;
4531 char *dst = line;
4532 unsigned char c;
4533
4534 for (i = 0; i < len; i++)
4535 if (!isspace((c = line[i])))
4536 *dst++ = c;
4537
4538 return dst - line;
4539 }
4540
4541 static void patch_id_consume(void *priv, char *line, unsigned long len)
4542 {
4543 struct patch_id_t *data = priv;
4544 int new_len;
4545
4546 /* Ignore line numbers when computing the SHA1 of the patch */
4547 if (starts_with(line, "@@ -"))
4548 return;
4549
4550 new_len = remove_space(line, len);
4551
4552 git_SHA1_Update(data->ctx, line, new_len);
4553 data->patchlen += new_len;
4554 }
4555
4556 /* returns 0 upon success, and writes result into sha1 */
4557 static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1, int diff_header_only)
4558 {
4559 struct diff_queue_struct *q = &diff_queued_diff;
4560 int i;
4561 git_SHA_CTX ctx;
4562 struct patch_id_t data;
4563 char buffer[PATH_MAX * 4 + 20];
4564
4565 git_SHA1_Init(&ctx);
4566 memset(&data, 0, sizeof(struct patch_id_t));
4567 data.ctx = &ctx;
4568
4569 for (i = 0; i < q->nr; i++) {
4570 xpparam_t xpp;
4571 xdemitconf_t xecfg;
4572 mmfile_t mf1, mf2;
4573 struct diff_filepair *p = q->queue[i];
4574 int len1, len2;
4575
4576 memset(&xpp, 0, sizeof(xpp));
4577 memset(&xecfg, 0, sizeof(xecfg));
4578 if (p->status == 0)
4579 return error("internal diff status error");
4580 if (p->status == DIFF_STATUS_UNKNOWN)
4581 continue;
4582 if (diff_unmodified_pair(p))
4583 continue;
4584 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4585 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4586 continue;
4587 if (DIFF_PAIR_UNMERGED(p))
4588 continue;
4589
4590 diff_fill_sha1_info(p->one);
4591 diff_fill_sha1_info(p->two);
4592
4593 len1 = remove_space(p->one->path, strlen(p->one->path));
4594 len2 = remove_space(p->two->path, strlen(p->two->path));
4595 if (p->one->mode == 0)
4596 len1 = snprintf(buffer, sizeof(buffer),
4597 "diff--gita/%.*sb/%.*s"
4598 "newfilemode%06o"
4599 "---/dev/null"
4600 "+++b/%.*s",
4601 len1, p->one->path,
4602 len2, p->two->path,
4603 p->two->mode,
4604 len2, p->two->path);
4605 else if (p->two->mode == 0)
4606 len1 = snprintf(buffer, sizeof(buffer),
4607 "diff--gita/%.*sb/%.*s"
4608 "deletedfilemode%06o"
4609 "---a/%.*s"
4610 "+++/dev/null",
4611 len1, p->one->path,
4612 len2, p->two->path,
4613 p->one->mode,
4614 len1, p->one->path);
4615 else
4616 len1 = snprintf(buffer, sizeof(buffer),
4617 "diff--gita/%.*sb/%.*s"
4618 "---a/%.*s"
4619 "+++b/%.*s",
4620 len1, p->one->path,
4621 len2, p->two->path,
4622 len1, p->one->path,
4623 len2, p->two->path);
4624 git_SHA1_Update(&ctx, buffer, len1);
4625
4626 if (diff_header_only)
4627 continue;
4628
4629 if (fill_mmfile(&mf1, p->one) < 0 ||
4630 fill_mmfile(&mf2, p->two) < 0)
4631 return error("unable to read files to diff");
4632
4633 if (diff_filespec_is_binary(p->one) ||
4634 diff_filespec_is_binary(p->two)) {
4635 git_SHA1_Update(&ctx, oid_to_hex(&p->one->oid),
4636 40);
4637 git_SHA1_Update(&ctx, oid_to_hex(&p->two->oid),
4638 40);
4639 continue;
4640 }
4641
4642 xpp.flags = 0;
4643 xecfg.ctxlen = 3;
4644 xecfg.flags = 0;
4645 if (xdi_diff_outf(&mf1, &mf2, patch_id_consume, &data,
4646 &xpp, &xecfg))
4647 return error("unable to generate patch-id diff for %s",
4648 p->one->path);
4649 }
4650
4651 git_SHA1_Final(sha1, &ctx);
4652 return 0;
4653 }
4654
4655 int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1, int diff_header_only)
4656 {
4657 struct diff_queue_struct *q = &diff_queued_diff;
4658 int i;
4659 int result = diff_get_patch_id(options, sha1, diff_header_only);
4660
4661 for (i = 0; i < q->nr; i++)
4662 diff_free_filepair(q->queue[i]);
4663
4664 free(q->queue);
4665 DIFF_QUEUE_CLEAR(q);
4666
4667 return result;
4668 }
4669
4670 static int is_summary_empty(const struct diff_queue_struct *q)
4671 {
4672 int i;
4673
4674 for (i = 0; i < q->nr; i++) {
4675 const struct diff_filepair *p = q->queue[i];
4676
4677 switch (p->status) {
4678 case DIFF_STATUS_DELETED:
4679 case DIFF_STATUS_ADDED:
4680 case DIFF_STATUS_COPIED:
4681 case DIFF_STATUS_RENAMED:
4682 return 0;
4683 default:
4684 if (p->score)
4685 return 0;
4686 if (p->one->mode && p->two->mode &&
4687 p->one->mode != p->two->mode)
4688 return 0;
4689 break;
4690 }
4691 }
4692 return 1;
4693 }
4694
4695 static const char rename_limit_warning[] =
4696 N_("inexact rename detection was skipped due to too many files.");
4697
4698 static const char degrade_cc_to_c_warning[] =
4699 N_("only found copies from modified paths due to too many files.");
4700
4701 static const char rename_limit_advice[] =
4702 N_("you may want to set your %s variable to at least "
4703 "%d and retry the command.");
4704
4705 void diff_warn_rename_limit(const char *varname, int needed, int degraded_cc)
4706 {
4707 if (degraded_cc)
4708 warning(_(degrade_cc_to_c_warning));
4709 else if (needed)
4710 warning(_(rename_limit_warning));
4711 else
4712 return;
4713 if (0 < needed && needed < 32767)
4714 warning(_(rename_limit_advice), varname, needed);
4715 }
4716
4717 void diff_flush(struct diff_options *options)
4718 {
4719 struct diff_queue_struct *q = &diff_queued_diff;
4720 int i, output_format = options->output_format;
4721 int separator = 0;
4722 int dirstat_by_line = 0;
4723
4724 /*
4725 * Order: raw, stat, summary, patch
4726 * or: name/name-status/checkdiff (other bits clear)
4727 */
4728 if (!q->nr)
4729 goto free_queue;
4730
4731 if (output_format & (DIFF_FORMAT_RAW |
4732 DIFF_FORMAT_NAME |
4733 DIFF_FORMAT_NAME_STATUS |
4734 DIFF_FORMAT_CHECKDIFF)) {
4735 for (i = 0; i < q->nr; i++) {
4736 struct diff_filepair *p = q->queue[i];
4737 if (check_pair_status(p))
4738 flush_one_pair(p, options);
4739 }
4740 separator++;
4741 }
4742
4743 if (output_format & DIFF_FORMAT_DIRSTAT && DIFF_OPT_TST(options, DIRSTAT_BY_LINE))
4744 dirstat_by_line = 1;
4745
4746 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT) ||
4747 dirstat_by_line) {
4748 struct diffstat_t diffstat;
4749
4750 memset(&diffstat, 0, sizeof(struct diffstat_t));
4751 for (i = 0; i < q->nr; i++) {
4752 struct diff_filepair *p = q->queue[i];
4753 if (check_pair_status(p))
4754 diff_flush_stat(p, options, &diffstat);
4755 }
4756 if (output_format & DIFF_FORMAT_NUMSTAT)
4757 show_numstat(&diffstat, options);
4758 if (output_format & DIFF_FORMAT_DIFFSTAT)
4759 show_stats(&diffstat, options);
4760 if (output_format & DIFF_FORMAT_SHORTSTAT)
4761 show_shortstats(&diffstat, options);
4762 if (output_format & DIFF_FORMAT_DIRSTAT && dirstat_by_line)
4763 show_dirstat_by_line(&diffstat, options);
4764 free_diffstat_info(&diffstat);
4765 separator++;
4766 }
4767 if ((output_format & DIFF_FORMAT_DIRSTAT) && !dirstat_by_line)
4768 show_dirstat(options);
4769
4770 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
4771 for (i = 0; i < q->nr; i++) {
4772 diff_summary(options, q->queue[i]);
4773 }
4774 separator++;
4775 }
4776
4777 if (output_format & DIFF_FORMAT_NO_OUTPUT &&
4778 DIFF_OPT_TST(options, EXIT_WITH_STATUS) &&
4779 DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
4780 /*
4781 * run diff_flush_patch for the exit status. setting
4782 * options->file to /dev/null should be safe, because we
4783 * aren't supposed to produce any output anyway.
4784 */
4785 if (options->close_file)
4786 fclose(options->file);
4787 options->file = fopen("/dev/null", "w");
4788 if (!options->file)
4789 die_errno("Could not open /dev/null");
4790 options->close_file = 1;
4791 for (i = 0; i < q->nr; i++) {
4792 struct diff_filepair *p = q->queue[i];
4793 if (check_pair_status(p))
4794 diff_flush_patch(p, options);
4795 if (options->found_changes)
4796 break;
4797 }
4798 }
4799
4800 if (output_format & DIFF_FORMAT_PATCH) {
4801 if (separator) {
4802 fprintf(options->file, "%s%c",
4803 diff_line_prefix(options),
4804 options->line_termination);
4805 if (options->stat_sep) {
4806 /* attach patch instead of inline */
4807 fputs(options->stat_sep, options->file);
4808 }
4809 }
4810
4811 for (i = 0; i < q->nr; i++) {
4812 struct diff_filepair *p = q->queue[i];
4813 if (check_pair_status(p))
4814 diff_flush_patch(p, options);
4815 }
4816 }
4817
4818 if (output_format & DIFF_FORMAT_CALLBACK)
4819 options->format_callback(q, options, options->format_callback_data);
4820
4821 for (i = 0; i < q->nr; i++)
4822 diff_free_filepair(q->queue[i]);
4823 free_queue:
4824 free(q->queue);
4825 DIFF_QUEUE_CLEAR(q);
4826 if (options->close_file)
4827 fclose(options->file);
4828
4829 /*
4830 * Report the content-level differences with HAS_CHANGES;
4831 * diff_addremove/diff_change does not set the bit when
4832 * DIFF_FROM_CONTENTS is in effect (e.g. with -w).
4833 */
4834 if (DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
4835 if (options->found_changes)
4836 DIFF_OPT_SET(options, HAS_CHANGES);
4837 else
4838 DIFF_OPT_CLR(options, HAS_CHANGES);
4839 }
4840 }
4841
4842 static int match_filter(const struct diff_options *options, const struct diff_filepair *p)
4843 {
4844 return (((p->status == DIFF_STATUS_MODIFIED) &&
4845 ((p->score &&
4846 filter_bit_tst(DIFF_STATUS_FILTER_BROKEN, options)) ||
4847 (!p->score &&
4848 filter_bit_tst(DIFF_STATUS_MODIFIED, options)))) ||
4849 ((p->status != DIFF_STATUS_MODIFIED) &&
4850 filter_bit_tst(p->status, options)));
4851 }
4852
4853 static void diffcore_apply_filter(struct diff_options *options)
4854 {
4855 int i;
4856 struct diff_queue_struct *q = &diff_queued_diff;
4857 struct diff_queue_struct outq;
4858
4859 DIFF_QUEUE_CLEAR(&outq);
4860
4861 if (!options->filter)
4862 return;
4863
4864 if (filter_bit_tst(DIFF_STATUS_FILTER_AON, options)) {
4865 int found;
4866 for (i = found = 0; !found && i < q->nr; i++) {
4867 if (match_filter(options, q->queue[i]))
4868 found++;
4869 }
4870 if (found)
4871 return;
4872
4873 /* otherwise we will clear the whole queue
4874 * by copying the empty outq at the end of this
4875 * function, but first clear the current entries
4876 * in the queue.
4877 */
4878 for (i = 0; i < q->nr; i++)
4879 diff_free_filepair(q->queue[i]);
4880 }
4881 else {
4882 /* Only the matching ones */
4883 for (i = 0; i < q->nr; i++) {
4884 struct diff_filepair *p = q->queue[i];
4885 if (match_filter(options, p))
4886 diff_q(&outq, p);
4887 else
4888 diff_free_filepair(p);
4889 }
4890 }
4891 free(q->queue);
4892 *q = outq;
4893 }
4894
4895 /* Check whether two filespecs with the same mode and size are identical */
4896 static int diff_filespec_is_identical(struct diff_filespec *one,
4897 struct diff_filespec *two)
4898 {
4899 if (S_ISGITLINK(one->mode))
4900 return 0;
4901 if (diff_populate_filespec(one, 0))
4902 return 0;
4903 if (diff_populate_filespec(two, 0))
4904 return 0;
4905 return !memcmp(one->data, two->data, one->size);
4906 }
4907
4908 static int diff_filespec_check_stat_unmatch(struct diff_filepair *p)
4909 {
4910 if (p->done_skip_stat_unmatch)
4911 return p->skip_stat_unmatch_result;
4912
4913 p->done_skip_stat_unmatch = 1;
4914 p->skip_stat_unmatch_result = 0;
4915 /*
4916 * 1. Entries that come from stat info dirtiness
4917 * always have both sides (iow, not create/delete),
4918 * one side of the object name is unknown, with
4919 * the same mode and size. Keep the ones that
4920 * do not match these criteria. They have real
4921 * differences.
4922 *
4923 * 2. At this point, the file is known to be modified,
4924 * with the same mode and size, and the object
4925 * name of one side is unknown. Need to inspect
4926 * the identical contents.
4927 */
4928 if (!DIFF_FILE_VALID(p->one) || /* (1) */
4929 !DIFF_FILE_VALID(p->two) ||
4930 (p->one->oid_valid && p->two->oid_valid) ||
4931 (p->one->mode != p->two->mode) ||
4932 diff_populate_filespec(p->one, CHECK_SIZE_ONLY) ||
4933 diff_populate_filespec(p->two, CHECK_SIZE_ONLY) ||
4934 (p->one->size != p->two->size) ||
4935 !diff_filespec_is_identical(p->one, p->two)) /* (2) */
4936 p->skip_stat_unmatch_result = 1;
4937 return p->skip_stat_unmatch_result;
4938 }
4939
4940 static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
4941 {
4942 int i;
4943 struct diff_queue_struct *q = &diff_queued_diff;
4944 struct diff_queue_struct outq;
4945 DIFF_QUEUE_CLEAR(&outq);
4946
4947 for (i = 0; i < q->nr; i++) {
4948 struct diff_filepair *p = q->queue[i];
4949
4950 if (diff_filespec_check_stat_unmatch(p))
4951 diff_q(&outq, p);
4952 else {
4953 /*
4954 * The caller can subtract 1 from skip_stat_unmatch
4955 * to determine how many paths were dirty only
4956 * due to stat info mismatch.
4957 */
4958 if (!DIFF_OPT_TST(diffopt, NO_INDEX))
4959 diffopt->skip_stat_unmatch++;
4960 diff_free_filepair(p);
4961 }
4962 }
4963 free(q->queue);
4964 *q = outq;
4965 }
4966
4967 static int diffnamecmp(const void *a_, const void *b_)
4968 {
4969 const struct diff_filepair *a = *((const struct diff_filepair **)a_);
4970 const struct diff_filepair *b = *((const struct diff_filepair **)b_);
4971 const char *name_a, *name_b;
4972
4973 name_a = a->one ? a->one->path : a->two->path;
4974 name_b = b->one ? b->one->path : b->two->path;
4975 return strcmp(name_a, name_b);
4976 }
4977
4978 void diffcore_fix_diff_index(struct diff_options *options)
4979 {
4980 struct diff_queue_struct *q = &diff_queued_diff;
4981 QSORT(q->queue, q->nr, diffnamecmp);
4982 }
4983
4984 void diffcore_std(struct diff_options *options)
4985 {
4986 /* NOTE please keep the following in sync with diff_tree_combined() */
4987 if (options->skip_stat_unmatch)
4988 diffcore_skip_stat_unmatch(options);
4989 if (!options->found_follow) {
4990 /* See try_to_follow_renames() in tree-diff.c */
4991 if (options->break_opt != -1)
4992 diffcore_break(options->break_opt);
4993 if (options->detect_rename)
4994 diffcore_rename(options);
4995 if (options->break_opt != -1)
4996 diffcore_merge_broken();
4997 }
4998 if (options->pickaxe)
4999 diffcore_pickaxe(options);
5000 if (options->orderfile)
5001 diffcore_order(options->orderfile);
5002 if (!options->found_follow)
5003 /* See try_to_follow_renames() in tree-diff.c */
5004 diff_resolve_rename_copy();
5005 diffcore_apply_filter(options);
5006
5007 if (diff_queued_diff.nr && !DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
5008 DIFF_OPT_SET(options, HAS_CHANGES);
5009 else
5010 DIFF_OPT_CLR(options, HAS_CHANGES);
5011
5012 options->found_follow = 0;
5013 }
5014
5015 int diff_result_code(struct diff_options *opt, int status)
5016 {
5017 int result = 0;
5018
5019 diff_warn_rename_limit("diff.renameLimit",
5020 opt->needed_rename_limit,
5021 opt->degraded_cc_to_c);
5022 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
5023 !(opt->output_format & DIFF_FORMAT_CHECKDIFF))
5024 return status;
5025 if (DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
5026 DIFF_OPT_TST(opt, HAS_CHANGES))
5027 result |= 01;
5028 if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) &&
5029 DIFF_OPT_TST(opt, CHECK_FAILED))
5030 result |= 02;
5031 return result;
5032 }
5033
5034 int diff_can_quit_early(struct diff_options *opt)
5035 {
5036 return (DIFF_OPT_TST(opt, QUICK) &&
5037 !opt->filter &&
5038 DIFF_OPT_TST(opt, HAS_CHANGES));
5039 }
5040
5041 /*
5042 * Shall changes to this submodule be ignored?
5043 *
5044 * Submodule changes can be configured to be ignored separately for each path,
5045 * but that configuration can be overridden from the command line.
5046 */
5047 static int is_submodule_ignored(const char *path, struct diff_options *options)
5048 {
5049 int ignored = 0;
5050 unsigned orig_flags = options->flags;
5051 if (!DIFF_OPT_TST(options, OVERRIDE_SUBMODULE_CONFIG))
5052 set_diffopt_flags_from_submodule_config(options, path);
5053 if (DIFF_OPT_TST(options, IGNORE_SUBMODULES))
5054 ignored = 1;
5055 options->flags = orig_flags;
5056 return ignored;
5057 }
5058
5059 void diff_addremove(struct diff_options *options,
5060 int addremove, unsigned mode,
5061 const unsigned char *sha1,
5062 int sha1_valid,
5063 const char *concatpath, unsigned dirty_submodule)
5064 {
5065 struct diff_filespec *one, *two;
5066
5067 if (S_ISGITLINK(mode) && is_submodule_ignored(concatpath, options))
5068 return;
5069
5070 /* This may look odd, but it is a preparation for
5071 * feeding "there are unchanged files which should
5072 * not produce diffs, but when you are doing copy
5073 * detection you would need them, so here they are"
5074 * entries to the diff-core. They will be prefixed
5075 * with something like '=' or '*' (I haven't decided
5076 * which but should not make any difference).
5077 * Feeding the same new and old to diff_change()
5078 * also has the same effect.
5079 * Before the final output happens, they are pruned after
5080 * merged into rename/copy pairs as appropriate.
5081 */
5082 if (DIFF_OPT_TST(options, REVERSE_DIFF))
5083 addremove = (addremove == '+' ? '-' :
5084 addremove == '-' ? '+' : addremove);
5085
5086 if (options->prefix &&
5087 strncmp(concatpath, options->prefix, options->prefix_length))
5088 return;
5089
5090 one = alloc_filespec(concatpath);
5091 two = alloc_filespec(concatpath);
5092
5093 if (addremove != '+')
5094 fill_filespec(one, sha1, sha1_valid, mode);
5095 if (addremove != '-') {
5096 fill_filespec(two, sha1, sha1_valid, mode);
5097 two->dirty_submodule = dirty_submodule;
5098 }
5099
5100 diff_queue(&diff_queued_diff, one, two);
5101 if (!DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
5102 DIFF_OPT_SET(options, HAS_CHANGES);
5103 }
5104
5105 void diff_change(struct diff_options *options,
5106 unsigned old_mode, unsigned new_mode,
5107 const unsigned char *old_sha1,
5108 const unsigned char *new_sha1,
5109 int old_sha1_valid, int new_sha1_valid,
5110 const char *concatpath,
5111 unsigned old_dirty_submodule, unsigned new_dirty_submodule)
5112 {
5113 struct diff_filespec *one, *two;
5114 struct diff_filepair *p;
5115
5116 if (S_ISGITLINK(old_mode) && S_ISGITLINK(new_mode) &&
5117 is_submodule_ignored(concatpath, options))
5118 return;
5119
5120 if (DIFF_OPT_TST(options, REVERSE_DIFF)) {
5121 SWAP(old_mode, new_mode);
5122 SWAP(old_sha1, new_sha1);
5123 SWAP(old_sha1_valid, new_sha1_valid);
5124 SWAP(old_dirty_submodule, new_dirty_submodule);
5125 }
5126
5127 if (options->prefix &&
5128 strncmp(concatpath, options->prefix, options->prefix_length))
5129 return;
5130
5131 one = alloc_filespec(concatpath);
5132 two = alloc_filespec(concatpath);
5133 fill_filespec(one, old_sha1, old_sha1_valid, old_mode);
5134 fill_filespec(two, new_sha1, new_sha1_valid, new_mode);
5135 one->dirty_submodule = old_dirty_submodule;
5136 two->dirty_submodule = new_dirty_submodule;
5137 p = diff_queue(&diff_queued_diff, one, two);
5138
5139 if (DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
5140 return;
5141
5142 if (DIFF_OPT_TST(options, QUICK) && options->skip_stat_unmatch &&
5143 !diff_filespec_check_stat_unmatch(p))
5144 return;
5145
5146 DIFF_OPT_SET(options, HAS_CHANGES);
5147 }
5148
5149 struct diff_filepair *diff_unmerge(struct diff_options *options, const char *path)
5150 {
5151 struct diff_filepair *pair;
5152 struct diff_filespec *one, *two;
5153
5154 if (options->prefix &&
5155 strncmp(path, options->prefix, options->prefix_length))
5156 return NULL;
5157
5158 one = alloc_filespec(path);
5159 two = alloc_filespec(path);
5160 pair = diff_queue(&diff_queued_diff, one, two);
5161 pair->is_unmerged = 1;
5162 return pair;
5163 }
5164
5165 static char *run_textconv(const char *pgm, struct diff_filespec *spec,
5166 size_t *outsize)
5167 {
5168 struct diff_tempfile *temp;
5169 const char *argv[3];
5170 const char **arg = argv;
5171 struct child_process child = CHILD_PROCESS_INIT;
5172 struct strbuf buf = STRBUF_INIT;
5173 int err = 0;
5174
5175 temp = prepare_temp_file(spec->path, spec);
5176 *arg++ = pgm;
5177 *arg++ = temp->name;
5178 *arg = NULL;
5179
5180 child.use_shell = 1;
5181 child.argv = argv;
5182 child.out = -1;
5183 if (start_command(&child)) {
5184 remove_tempfile();
5185 return NULL;
5186 }
5187
5188 if (strbuf_read(&buf, child.out, 0) < 0)
5189 err = error("error reading from textconv command '%s'", pgm);
5190 close(child.out);
5191
5192 if (finish_command(&child) || err) {
5193 strbuf_release(&buf);
5194 remove_tempfile();
5195 return NULL;
5196 }
5197 remove_tempfile();
5198
5199 return strbuf_detach(&buf, outsize);
5200 }
5201
5202 size_t fill_textconv(struct userdiff_driver *driver,
5203 struct diff_filespec *df,
5204 char **outbuf)
5205 {
5206 size_t size;
5207
5208 if (!driver) {
5209 if (!DIFF_FILE_VALID(df)) {
5210 *outbuf = "";
5211 return 0;
5212 }
5213 if (diff_populate_filespec(df, 0))
5214 die("unable to read files to diff");
5215 *outbuf = df->data;
5216 return df->size;
5217 }
5218
5219 if (!driver->textconv)
5220 die("BUG: fill_textconv called with non-textconv driver");
5221
5222 if (driver->textconv_cache && df->oid_valid) {
5223 *outbuf = notes_cache_get(driver->textconv_cache,
5224 df->oid.hash,
5225 &size);
5226 if (*outbuf)
5227 return size;
5228 }
5229
5230 *outbuf = run_textconv(driver->textconv, df, &size);
5231 if (!*outbuf)
5232 die("unable to read files to diff");
5233
5234 if (driver->textconv_cache && df->oid_valid) {
5235 /* ignore errors, as we might be in a readonly repository */
5236 notes_cache_put(driver->textconv_cache, df->oid.hash, *outbuf,
5237 size);
5238 /*
5239 * we could save up changes and flush them all at the end,
5240 * but we would need an extra call after all diffing is done.
5241 * Since generating a cache entry is the slow path anyway,
5242 * this extra overhead probably isn't a big deal.
5243 */
5244 notes_cache_write(driver->textconv_cache);
5245 }
5246
5247 return size;
5248 }
5249
5250 void setup_diff_pager(struct diff_options *opt)
5251 {
5252 /*
5253 * If the user asked for our exit code, then either they want --quiet
5254 * or --exit-code. We should definitely not bother with a pager in the
5255 * former case, as we will generate no output. Since we still properly
5256 * report our exit code even when a pager is run, we _could_ run a
5257 * pager with --exit-code. But since we have not done so historically,
5258 * and because it is easy to find people oneline advising "git diff
5259 * --exit-code" in hooks and other scripts, we do not do so.
5260 */
5261 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
5262 check_pager_config("diff") != 0)
5263 setup_pager();
5264 }
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