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Convert remaining callers of resolve_gitlink_ref to object_id
[git/debian.git] / diff.c
blob69f03570adf6cf2c3642aea1fb0dba5011ef966f
1 /*
2 * Copyright (C) 2005 Junio C Hamano
3 */
4 #include "cache.h"
5 #include "config.h"
6 #include "tempfile.h"
7 #include "quote.h"
8 #include "diff.h"
9 #include "diffcore.h"
10 #include "delta.h"
11 #include "xdiff-interface.h"
12 #include "color.h"
13 #include "attr.h"
14 #include "run-command.h"
15 #include "utf8.h"
16 #include "userdiff.h"
17 #include "submodule-config.h"
18 #include "submodule.h"
19 #include "hashmap.h"
20 #include "ll-merge.h"
21 #include "string-list.h"
22 #include "argv-array.h"
23 #include "graph.h"
24 #include "packfile.h"
25
26 #ifdef NO_FAST_WORKING_DIRECTORY
27 #define FAST_WORKING_DIRECTORY 0
28 #else
29 #define FAST_WORKING_DIRECTORY 1
30 #endif
31
32 static int diff_detect_rename_default;
33 static int diff_indent_heuristic = 1;
34 static int diff_rename_limit_default = 400;
35 static int diff_suppress_blank_empty;
36 static int diff_use_color_default = -1;
37 static int diff_color_moved_default;
38 static int diff_context_default = 3;
39 static int diff_interhunk_context_default;
40 static const char *diff_word_regex_cfg;
41 static const char *external_diff_cmd_cfg;
42 static const char *diff_order_file_cfg;
43 int diff_auto_refresh_index = 1;
44 static int diff_mnemonic_prefix;
45 static int diff_no_prefix;
46 static int diff_stat_graph_width;
47 static int diff_dirstat_permille_default = 30;
48 static struct diff_options default_diff_options;
49 static long diff_algorithm;
50 static unsigned ws_error_highlight_default = WSEH_NEW;
51
52 static char diff_colors[][COLOR_MAXLEN] = {
53 GIT_COLOR_RESET,
54 GIT_COLOR_NORMAL, /* CONTEXT */
55 GIT_COLOR_BOLD, /* METAINFO */
56 GIT_COLOR_CYAN, /* FRAGINFO */
57 GIT_COLOR_RED, /* OLD */
58 GIT_COLOR_GREEN, /* NEW */
59 GIT_COLOR_YELLOW, /* COMMIT */
60 GIT_COLOR_BG_RED, /* WHITESPACE */
61 GIT_COLOR_NORMAL, /* FUNCINFO */
62 GIT_COLOR_BOLD_MAGENTA, /* OLD_MOVED */
63 GIT_COLOR_BOLD_BLUE, /* OLD_MOVED ALTERNATIVE */
64 GIT_COLOR_FAINT, /* OLD_MOVED_DIM */
65 GIT_COLOR_FAINT_ITALIC, /* OLD_MOVED_ALTERNATIVE_DIM */
66 GIT_COLOR_BOLD_CYAN, /* NEW_MOVED */
67 GIT_COLOR_BOLD_YELLOW, /* NEW_MOVED ALTERNATIVE */
68 GIT_COLOR_FAINT, /* NEW_MOVED_DIM */
69 GIT_COLOR_FAINT_ITALIC, /* NEW_MOVED_ALTERNATIVE_DIM */
70 };
71
72 static NORETURN void die_want_option(const char *option_name)
73 {
74 die(_("option '%s' requires a value"), option_name);
75 }
76
77 static int parse_diff_color_slot(const char *var)
78 {
79 if (!strcasecmp(var, "context") || !strcasecmp(var, "plain"))
80 return DIFF_CONTEXT;
81 if (!strcasecmp(var, "meta"))
82 return DIFF_METAINFO;
83 if (!strcasecmp(var, "frag"))
84 return DIFF_FRAGINFO;
85 if (!strcasecmp(var, "old"))
86 return DIFF_FILE_OLD;
87 if (!strcasecmp(var, "new"))
88 return DIFF_FILE_NEW;
89 if (!strcasecmp(var, "commit"))
90 return DIFF_COMMIT;
91 if (!strcasecmp(var, "whitespace"))
92 return DIFF_WHITESPACE;
93 if (!strcasecmp(var, "func"))
94 return DIFF_FUNCINFO;
95 if (!strcasecmp(var, "oldmoved"))
96 return DIFF_FILE_OLD_MOVED;
97 if (!strcasecmp(var, "oldmovedalternative"))
98 return DIFF_FILE_OLD_MOVED_ALT;
99 if (!strcasecmp(var, "oldmoveddimmed"))
100 return DIFF_FILE_OLD_MOVED_DIM;
101 if (!strcasecmp(var, "oldmovedalternativedimmed"))
102 return DIFF_FILE_OLD_MOVED_ALT_DIM;
103 if (!strcasecmp(var, "newmoved"))
104 return DIFF_FILE_NEW_MOVED;
105 if (!strcasecmp(var, "newmovedalternative"))
106 return DIFF_FILE_NEW_MOVED_ALT;
107 if (!strcasecmp(var, "newmoveddimmed"))
108 return DIFF_FILE_NEW_MOVED_DIM;
109 if (!strcasecmp(var, "newmovedalternativedimmed"))
110 return DIFF_FILE_NEW_MOVED_ALT_DIM;
111 return -1;
112 }
113
114 static int parse_dirstat_params(struct diff_options *options, const char *params_string,
115 struct strbuf *errmsg)
116 {
117 char *params_copy = xstrdup(params_string);
118 struct string_list params = STRING_LIST_INIT_NODUP;
119 int ret = 0;
120 int i;
121
122 if (*params_copy)
123 string_list_split_in_place(&params, params_copy, ',', -1);
124 for (i = 0; i < params.nr; i++) {
125 const char *p = params.items[i].string;
126 if (!strcmp(p, "changes")) {
127 DIFF_OPT_CLR(options, DIRSTAT_BY_LINE);
128 DIFF_OPT_CLR(options, DIRSTAT_BY_FILE);
129 } else if (!strcmp(p, "lines")) {
130 DIFF_OPT_SET(options, DIRSTAT_BY_LINE);
131 DIFF_OPT_CLR(options, DIRSTAT_BY_FILE);
132 } else if (!strcmp(p, "files")) {
133 DIFF_OPT_CLR(options, DIRSTAT_BY_LINE);
134 DIFF_OPT_SET(options, DIRSTAT_BY_FILE);
135 } else if (!strcmp(p, "noncumulative")) {
136 DIFF_OPT_CLR(options, DIRSTAT_CUMULATIVE);
137 } else if (!strcmp(p, "cumulative")) {
138 DIFF_OPT_SET(options, DIRSTAT_CUMULATIVE);
139 } else if (isdigit(*p)) {
140 char *end;
141 int permille = strtoul(p, &end, 10) * 10;
142 if (*end == '.' && isdigit(*++end)) {
143 /* only use first digit */
144 permille += *end - '0';
145 /* .. and ignore any further digits */
146 while (isdigit(*++end))
147 ; /* nothing */
148 }
149 if (!*end)
150 options->dirstat_permille = permille;
151 else {
152 strbuf_addf(errmsg, _(" Failed to parse dirstat cut-off percentage '%s'\n"),
153 p);
154 ret++;
155 }
156 } else {
157 strbuf_addf(errmsg, _(" Unknown dirstat parameter '%s'\n"), p);
158 ret++;
159 }
160
161 }
162 string_list_clear(&params, 0);
163 free(params_copy);
164 return ret;
165 }
166
167 static int parse_submodule_params(struct diff_options *options, const char *value)
168 {
169 if (!strcmp(value, "log"))
170 options->submodule_format = DIFF_SUBMODULE_LOG;
171 else if (!strcmp(value, "short"))
172 options->submodule_format = DIFF_SUBMODULE_SHORT;
173 else if (!strcmp(value, "diff"))
174 options->submodule_format = DIFF_SUBMODULE_INLINE_DIFF;
175 else
176 return -1;
177 return 0;
178 }
179
180 static int git_config_rename(const char *var, const char *value)
181 {
182 if (!value)
183 return DIFF_DETECT_RENAME;
184 if (!strcasecmp(value, "copies") || !strcasecmp(value, "copy"))
185 return DIFF_DETECT_COPY;
186 return git_config_bool(var,value) ? DIFF_DETECT_RENAME : 0;
187 }
188
189 long parse_algorithm_value(const char *value)
190 {
191 if (!value)
192 return -1;
193 else if (!strcasecmp(value, "myers") || !strcasecmp(value, "default"))
194 return 0;
195 else if (!strcasecmp(value, "minimal"))
196 return XDF_NEED_MINIMAL;
197 else if (!strcasecmp(value, "patience"))
198 return XDF_PATIENCE_DIFF;
199 else if (!strcasecmp(value, "histogram"))
200 return XDF_HISTOGRAM_DIFF;
201 return -1;
202 }
203
204 static int parse_one_token(const char **arg, const char *token)
205 {
206 const char *rest;
207 if (skip_prefix(*arg, token, &rest) && (!*rest || *rest == ',')) {
208 *arg = rest;
209 return 1;
210 }
211 return 0;
212 }
213
214 static int parse_ws_error_highlight(const char *arg)
215 {
216 const char *orig_arg = arg;
217 unsigned val = 0;
218
219 while (*arg) {
220 if (parse_one_token(&arg, "none"))
221 val = 0;
222 else if (parse_one_token(&arg, "default"))
223 val = WSEH_NEW;
224 else if (parse_one_token(&arg, "all"))
225 val = WSEH_NEW | WSEH_OLD | WSEH_CONTEXT;
226 else if (parse_one_token(&arg, "new"))
227 val |= WSEH_NEW;
228 else if (parse_one_token(&arg, "old"))
229 val |= WSEH_OLD;
230 else if (parse_one_token(&arg, "context"))
231 val |= WSEH_CONTEXT;
232 else {
233 return -1 - (int)(arg - orig_arg);
234 }
235 if (*arg)
236 arg++;
237 }
238 return val;
239 }
240
241 /*
242 * These are to give UI layer defaults.
243 * The core-level commands such as git-diff-files should
244 * never be affected by the setting of diff.renames
245 * the user happens to have in the configuration file.
246 */
247 void init_diff_ui_defaults(void)
248 {
249 diff_detect_rename_default = 1;
250 }
251
252 int git_diff_heuristic_config(const char *var, const char *value, void *cb)
253 {
254 if (!strcmp(var, "diff.indentheuristic"))
255 diff_indent_heuristic = git_config_bool(var, value);
256 return 0;
257 }
258
259 static int parse_color_moved(const char *arg)
260 {
261 switch (git_parse_maybe_bool(arg)) {
262 case 0:
263 return COLOR_MOVED_NO;
264 case 1:
265 return COLOR_MOVED_DEFAULT;
266 default:
267 break;
268 }
269
270 if (!strcmp(arg, "no"))
271 return COLOR_MOVED_NO;
272 else if (!strcmp(arg, "plain"))
273 return COLOR_MOVED_PLAIN;
274 else if (!strcmp(arg, "zebra"))
275 return COLOR_MOVED_ZEBRA;
276 else if (!strcmp(arg, "default"))
277 return COLOR_MOVED_DEFAULT;
278 else if (!strcmp(arg, "dimmed_zebra"))
279 return COLOR_MOVED_ZEBRA_DIM;
280 else
281 return error(_("color moved setting must be one of 'no', 'default', 'zebra', 'dimmed_zebra', 'plain'"));
282 }
283
284 int git_diff_ui_config(const char *var, const char *value, void *cb)
285 {
286 if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
287 diff_use_color_default = git_config_colorbool(var, value);
288 return 0;
289 }
290 if (!strcmp(var, "diff.colormoved")) {
291 int cm = parse_color_moved(value);
292 if (cm < 0)
293 return -1;
294 diff_color_moved_default = cm;
295 return 0;
296 }
297 if (!strcmp(var, "diff.context")) {
298 diff_context_default = git_config_int(var, value);
299 if (diff_context_default < 0)
300 return -1;
301 return 0;
302 }
303 if (!strcmp(var, "diff.interhunkcontext")) {
304 diff_interhunk_context_default = git_config_int(var, value);
305 if (diff_interhunk_context_default < 0)
306 return -1;
307 return 0;
308 }
309 if (!strcmp(var, "diff.renames")) {
310 diff_detect_rename_default = git_config_rename(var, value);
311 return 0;
312 }
313 if (!strcmp(var, "diff.autorefreshindex")) {
314 diff_auto_refresh_index = git_config_bool(var, value);
315 return 0;
316 }
317 if (!strcmp(var, "diff.mnemonicprefix")) {
318 diff_mnemonic_prefix = git_config_bool(var, value);
319 return 0;
320 }
321 if (!strcmp(var, "diff.noprefix")) {
322 diff_no_prefix = git_config_bool(var, value);
323 return 0;
324 }
325 if (!strcmp(var, "diff.statgraphwidth")) {
326 diff_stat_graph_width = git_config_int(var, value);
327 return 0;
328 }
329 if (!strcmp(var, "diff.external"))
330 return git_config_string(&external_diff_cmd_cfg, var, value);
331 if (!strcmp(var, "diff.wordregex"))
332 return git_config_string(&diff_word_regex_cfg, var, value);
333 if (!strcmp(var, "diff.orderfile"))
334 return git_config_pathname(&diff_order_file_cfg, var, value);
335
336 if (!strcmp(var, "diff.ignoresubmodules"))
337 handle_ignore_submodules_arg(&default_diff_options, value);
338
339 if (!strcmp(var, "diff.submodule")) {
340 if (parse_submodule_params(&default_diff_options, value))
341 warning(_("Unknown value for 'diff.submodule' config variable: '%s'"),
342 value);
343 return 0;
344 }
345
346 if (!strcmp(var, "diff.algorithm")) {
347 diff_algorithm = parse_algorithm_value(value);
348 if (diff_algorithm < 0)
349 return -1;
350 return 0;
351 }
352
353 if (!strcmp(var, "diff.wserrorhighlight")) {
354 int val = parse_ws_error_highlight(value);
355 if (val < 0)
356 return -1;
357 ws_error_highlight_default = val;
358 return 0;
359 }
360
361 return git_diff_basic_config(var, value, cb);
362 }
363
364 int git_diff_basic_config(const char *var, const char *value, void *cb)
365 {
366 const char *name;
367
368 if (!strcmp(var, "diff.renamelimit")) {
369 diff_rename_limit_default = git_config_int(var, value);
370 return 0;
371 }
372
373 if (userdiff_config(var, value) < 0)
374 return -1;
375
376 if (skip_prefix(var, "diff.color.", &name) ||
377 skip_prefix(var, "color.diff.", &name)) {
378 int slot = parse_diff_color_slot(name);
379 if (slot < 0)
380 return 0;
381 if (!value)
382 return config_error_nonbool(var);
383 return color_parse(value, diff_colors[slot]);
384 }
385
386 /* like GNU diff's --suppress-blank-empty option */
387 if (!strcmp(var, "diff.suppressblankempty") ||
388 /* for backwards compatibility */
389 !strcmp(var, "diff.suppress-blank-empty")) {
390 diff_suppress_blank_empty = git_config_bool(var, value);
391 return 0;
392 }
393
394 if (!strcmp(var, "diff.dirstat")) {
395 struct strbuf errmsg = STRBUF_INIT;
396 default_diff_options.dirstat_permille = diff_dirstat_permille_default;
397 if (parse_dirstat_params(&default_diff_options, value, &errmsg))
398 warning(_("Found errors in 'diff.dirstat' config variable:\n%s"),
399 errmsg.buf);
400 strbuf_release(&errmsg);
401 diff_dirstat_permille_default = default_diff_options.dirstat_permille;
402 return 0;
403 }
404
405 if (git_diff_heuristic_config(var, value, cb) < 0)
406 return -1;
407
408 return git_default_config(var, value, cb);
409 }
410
411 static char *quote_two(const char *one, const char *two)
412 {
413 int need_one = quote_c_style(one, NULL, NULL, 1);
414 int need_two = quote_c_style(two, NULL, NULL, 1);
415 struct strbuf res = STRBUF_INIT;
416
417 if (need_one + need_two) {
418 strbuf_addch(&res, '"');
419 quote_c_style(one, &res, NULL, 1);
420 quote_c_style(two, &res, NULL, 1);
421 strbuf_addch(&res, '"');
422 } else {
423 strbuf_addstr(&res, one);
424 strbuf_addstr(&res, two);
425 }
426 return strbuf_detach(&res, NULL);
427 }
428
429 static const char *external_diff(void)
430 {
431 static const char *external_diff_cmd = NULL;
432 static int done_preparing = 0;
433
434 if (done_preparing)
435 return external_diff_cmd;
436 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
437 if (!external_diff_cmd)
438 external_diff_cmd = external_diff_cmd_cfg;
439 done_preparing = 1;
440 return external_diff_cmd;
441 }
442
443 /*
444 * Keep track of files used for diffing. Sometimes such an entry
445 * refers to a temporary file, sometimes to an existing file, and
446 * sometimes to "/dev/null".
447 */
448 static struct diff_tempfile {
449 /*
450 * filename external diff should read from, or NULL if this
451 * entry is currently not in use:
452 */
453 const char *name;
454
455 char hex[GIT_MAX_HEXSZ + 1];
456 char mode[10];
457
458 /*
459 * If this diff_tempfile instance refers to a temporary file,
460 * this tempfile object is used to manage its lifetime.
461 */
462 struct tempfile *tempfile;
463 } diff_temp[2];
464
465 struct emit_callback {
466 int color_diff;
467 unsigned ws_rule;
468 int blank_at_eof_in_preimage;
469 int blank_at_eof_in_postimage;
470 int lno_in_preimage;
471 int lno_in_postimage;
472 const char **label_path;
473 struct diff_words_data *diff_words;
474 struct diff_options *opt;
475 struct strbuf *header;
476 };
477
478 static int count_lines(const char *data, int size)
479 {
480 int count, ch, completely_empty = 1, nl_just_seen = 0;
481 count = 0;
482 while (0 < size--) {
483 ch = *data++;
484 if (ch == '\n') {
485 count++;
486 nl_just_seen = 1;
487 completely_empty = 0;
488 }
489 else {
490 nl_just_seen = 0;
491 completely_empty = 0;
492 }
493 }
494 if (completely_empty)
495 return 0;
496 if (!nl_just_seen)
497 count++; /* no trailing newline */
498 return count;
499 }
500
501 static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
502 {
503 if (!DIFF_FILE_VALID(one)) {
504 mf->ptr = (char *)""; /* does not matter */
505 mf->size = 0;
506 return 0;
507 }
508 else if (diff_populate_filespec(one, 0))
509 return -1;
510
511 mf->ptr = one->data;
512 mf->size = one->size;
513 return 0;
514 }
515
516 /* like fill_mmfile, but only for size, so we can avoid retrieving blob */
517 static unsigned long diff_filespec_size(struct diff_filespec *one)
518 {
519 if (!DIFF_FILE_VALID(one))
520 return 0;
521 diff_populate_filespec(one, CHECK_SIZE_ONLY);
522 return one->size;
523 }
524
525 static int count_trailing_blank(mmfile_t *mf, unsigned ws_rule)
526 {
527 char *ptr = mf->ptr;
528 long size = mf->size;
529 int cnt = 0;
530
531 if (!size)
532 return cnt;
533 ptr += size - 1; /* pointing at the very end */
534 if (*ptr != '\n')
535 ; /* incomplete line */
536 else
537 ptr--; /* skip the last LF */
538 while (mf->ptr < ptr) {
539 char *prev_eol;
540 for (prev_eol = ptr; mf->ptr <= prev_eol; prev_eol--)
541 if (*prev_eol == '\n')
542 break;
543 if (!ws_blank_line(prev_eol + 1, ptr - prev_eol, ws_rule))
544 break;
545 cnt++;
546 ptr = prev_eol - 1;
547 }
548 return cnt;
549 }
550
551 static void check_blank_at_eof(mmfile_t *mf1, mmfile_t *mf2,
552 struct emit_callback *ecbdata)
553 {
554 int l1, l2, at;
555 unsigned ws_rule = ecbdata->ws_rule;
556 l1 = count_trailing_blank(mf1, ws_rule);
557 l2 = count_trailing_blank(mf2, ws_rule);
558 if (l2 <= l1) {
559 ecbdata->blank_at_eof_in_preimage = 0;
560 ecbdata->blank_at_eof_in_postimage = 0;
561 return;
562 }
563 at = count_lines(mf1->ptr, mf1->size);
564 ecbdata->blank_at_eof_in_preimage = (at - l1) + 1;
565
566 at = count_lines(mf2->ptr, mf2->size);
567 ecbdata->blank_at_eof_in_postimage = (at - l2) + 1;
568 }
569
570 static void emit_line_0(struct diff_options *o, const char *set, const char *reset,
571 int first, const char *line, int len)
572 {
573 int has_trailing_newline, has_trailing_carriage_return;
574 int nofirst;
575 FILE *file = o->file;
576
577 fputs(diff_line_prefix(o), file);
578
579 if (len == 0) {
580 has_trailing_newline = (first == '\n');
581 has_trailing_carriage_return = (!has_trailing_newline &&
582 (first == '\r'));
583 nofirst = has_trailing_newline || has_trailing_carriage_return;
584 } else {
585 has_trailing_newline = (len > 0 && line[len-1] == '\n');
586 if (has_trailing_newline)
587 len--;
588 has_trailing_carriage_return = (len > 0 && line[len-1] == '\r');
589 if (has_trailing_carriage_return)
590 len--;
591 nofirst = 0;
592 }
593
594 if (len || !nofirst) {
595 fputs(set, file);
596 if (!nofirst)
597 fputc(first, file);
598 fwrite(line, len, 1, file);
599 fputs(reset, file);
600 }
601 if (has_trailing_carriage_return)
602 fputc('\r', file);
603 if (has_trailing_newline)
604 fputc('\n', file);
605 }
606
607 static void emit_line(struct diff_options *o, const char *set, const char *reset,
608 const char *line, int len)
609 {
610 emit_line_0(o, set, reset, line[0], line+1, len-1);
611 }
612
613 enum diff_symbol {
614 DIFF_SYMBOL_BINARY_DIFF_HEADER,
615 DIFF_SYMBOL_BINARY_DIFF_HEADER_DELTA,
616 DIFF_SYMBOL_BINARY_DIFF_HEADER_LITERAL,
617 DIFF_SYMBOL_BINARY_DIFF_BODY,
618 DIFF_SYMBOL_BINARY_DIFF_FOOTER,
619 DIFF_SYMBOL_STATS_SUMMARY_NO_FILES,
620 DIFF_SYMBOL_STATS_SUMMARY_ABBREV,
621 DIFF_SYMBOL_STATS_SUMMARY_INSERTS_DELETES,
622 DIFF_SYMBOL_STATS_LINE,
623 DIFF_SYMBOL_WORD_DIFF,
624 DIFF_SYMBOL_STAT_SEP,
625 DIFF_SYMBOL_SUMMARY,
626 DIFF_SYMBOL_SUBMODULE_ADD,
627 DIFF_SYMBOL_SUBMODULE_DEL,
628 DIFF_SYMBOL_SUBMODULE_UNTRACKED,
629 DIFF_SYMBOL_SUBMODULE_MODIFIED,
630 DIFF_SYMBOL_SUBMODULE_HEADER,
631 DIFF_SYMBOL_SUBMODULE_ERROR,
632 DIFF_SYMBOL_SUBMODULE_PIPETHROUGH,
633 DIFF_SYMBOL_REWRITE_DIFF,
634 DIFF_SYMBOL_BINARY_FILES,
635 DIFF_SYMBOL_HEADER,
636 DIFF_SYMBOL_FILEPAIR_PLUS,
637 DIFF_SYMBOL_FILEPAIR_MINUS,
638 DIFF_SYMBOL_WORDS_PORCELAIN,
639 DIFF_SYMBOL_WORDS,
640 DIFF_SYMBOL_CONTEXT,
641 DIFF_SYMBOL_CONTEXT_INCOMPLETE,
642 DIFF_SYMBOL_PLUS,
643 DIFF_SYMBOL_MINUS,
644 DIFF_SYMBOL_NO_LF_EOF,
645 DIFF_SYMBOL_CONTEXT_FRAGINFO,
646 DIFF_SYMBOL_CONTEXT_MARKER,
647 DIFF_SYMBOL_SEPARATOR
648 };
649 /*
650 * Flags for content lines:
651 * 0..12 are whitespace rules
652 * 13-15 are WSEH_NEW | WSEH_OLD | WSEH_CONTEXT
653 * 16 is marking if the line is blank at EOF
654 */
655 #define DIFF_SYMBOL_CONTENT_BLANK_LINE_EOF (1<<16)
656 #define DIFF_SYMBOL_MOVED_LINE (1<<17)
657 #define DIFF_SYMBOL_MOVED_LINE_ALT (1<<18)
658 #define DIFF_SYMBOL_MOVED_LINE_UNINTERESTING (1<<19)
659 #define DIFF_SYMBOL_CONTENT_WS_MASK (WSEH_NEW | WSEH_OLD | WSEH_CONTEXT | WS_RULE_MASK)
660
661 /*
662 * This struct is used when we need to buffer the output of the diff output.
663 *
664 * NEEDSWORK: Instead of storing a copy of the line, add an offset pointer
665 * into the pre/post image file. This pointer could be a union with the
666 * line pointer. By storing an offset into the file instead of the literal line,
667 * we can decrease the memory footprint for the buffered output. At first we
668 * may want to only have indirection for the content lines, but we could also
669 * enhance the state for emitting prefabricated lines, e.g. the similarity
670 * score line or hunk/file headers would only need to store a number or path
671 * and then the output can be constructed later on depending on state.
672 */
673 struct emitted_diff_symbol {
674 const char *line;
675 int len;
676 int flags;
677 enum diff_symbol s;
678 };
679 #define EMITTED_DIFF_SYMBOL_INIT {NULL}
680
681 struct emitted_diff_symbols {
682 struct emitted_diff_symbol *buf;
683 int nr, alloc;
684 };
685 #define EMITTED_DIFF_SYMBOLS_INIT {NULL, 0, 0}
686
687 static void append_emitted_diff_symbol(struct diff_options *o,
688 struct emitted_diff_symbol *e)
689 {
690 struct emitted_diff_symbol *f;
691
692 ALLOC_GROW(o->emitted_symbols->buf,
693 o->emitted_symbols->nr + 1,
694 o->emitted_symbols->alloc);
695 f = &o->emitted_symbols->buf[o->emitted_symbols->nr++];
696
697 memcpy(f, e, sizeof(struct emitted_diff_symbol));
698 f->line = e->line ? xmemdupz(e->line, e->len) : NULL;
699 }
700
701 struct moved_entry {
702 struct hashmap_entry ent;
703 const struct emitted_diff_symbol *es;
704 struct moved_entry *next_line;
705 };
706
707 static int next_byte(const char **cp, const char **endp,
708 const struct diff_options *diffopt)
709 {
710 int retval;
711
712 if (*cp > *endp)
713 return -1;
714
715 if (DIFF_XDL_TST(diffopt, IGNORE_WHITESPACE_CHANGE)) {
716 while (*cp < *endp && isspace(**cp))
717 (*cp)++;
718 /*
719 * After skipping a couple of whitespaces, we still have to
720 * account for one space.
721 */
722 return (int)' ';
723 }
724
725 if (DIFF_XDL_TST(diffopt, IGNORE_WHITESPACE)) {
726 while (*cp < *endp && isspace(**cp))
727 (*cp)++;
728 /* return the first non-ws character via the usual below */
729 }
730
731 retval = (unsigned char)(**cp);
732 (*cp)++;
733 return retval;
734 }
735
736 static int moved_entry_cmp(const struct diff_options *diffopt,
737 const struct moved_entry *a,
738 const struct moved_entry *b,
739 const void *keydata)
740 {
741 const char *ap = a->es->line, *ae = a->es->line + a->es->len;
742 const char *bp = b->es->line, *be = b->es->line + b->es->len;
743
744 if (!(diffopt->xdl_opts & XDF_WHITESPACE_FLAGS))
745 return a->es->len != b->es->len || memcmp(ap, bp, a->es->len);
746
747 if (DIFF_XDL_TST(diffopt, IGNORE_WHITESPACE_AT_EOL)) {
748 while (ae > ap && isspace(*ae))
749 ae--;
750 while (be > bp && isspace(*be))
751 be--;
752 }
753
754 while (1) {
755 int ca, cb;
756 ca = next_byte(&ap, &ae, diffopt);
757 cb = next_byte(&bp, &be, diffopt);
758 if (ca != cb)
759 return 1;
760 if (ca < 0)
761 return 0;
762 }
763 }
764
765 static unsigned get_string_hash(struct emitted_diff_symbol *es, struct diff_options *o)
766 {
767 if (o->xdl_opts & XDF_WHITESPACE_FLAGS) {
768 static struct strbuf sb = STRBUF_INIT;
769 const char *ap = es->line, *ae = es->line + es->len;
770 int c;
771
772 strbuf_reset(&sb);
773 while (ae > ap && isspace(*ae))
774 ae--;
775 while ((c = next_byte(&ap, &ae, o)) > 0)
776 strbuf_addch(&sb, c);
777
778 return memhash(sb.buf, sb.len);
779 } else {
780 return memhash(es->line, es->len);
781 }
782 }
783
784 static struct moved_entry *prepare_entry(struct diff_options *o,
785 int line_no)
786 {
787 struct moved_entry *ret = xmalloc(sizeof(*ret));
788 struct emitted_diff_symbol *l = &o->emitted_symbols->buf[line_no];
789
790 ret->ent.hash = get_string_hash(l, o);
791 ret->es = l;
792 ret->next_line = NULL;
793
794 return ret;
795 }
796
797 static void add_lines_to_move_detection(struct diff_options *o,
798 struct hashmap *add_lines,
799 struct hashmap *del_lines)
800 {
801 struct moved_entry *prev_line = NULL;
802
803 int n;
804 for (n = 0; n < o->emitted_symbols->nr; n++) {
805 struct hashmap *hm;
806 struct moved_entry *key;
807
808 switch (o->emitted_symbols->buf[n].s) {
809 case DIFF_SYMBOL_PLUS:
810 hm = add_lines;
811 break;
812 case DIFF_SYMBOL_MINUS:
813 hm = del_lines;
814 break;
815 default:
816 prev_line = NULL;
817 continue;
818 }
819
820 key = prepare_entry(o, n);
821 if (prev_line && prev_line->es->s == o->emitted_symbols->buf[n].s)
822 prev_line->next_line = key;
823
824 hashmap_add(hm, key);
825 prev_line = key;
826 }
827 }
828
829 static int shrink_potential_moved_blocks(struct moved_entry **pmb,
830 int pmb_nr)
831 {
832 int lp, rp;
833
834 /* Shrink the set of potential block to the remaining running */
835 for (lp = 0, rp = pmb_nr - 1; lp <= rp;) {
836 while (lp < pmb_nr && pmb[lp])
837 lp++;
838 /* lp points at the first NULL now */
839
840 while (rp > -1 && !pmb[rp])
841 rp--;
842 /* rp points at the last non-NULL */
843
844 if (lp < pmb_nr && rp > -1 && lp < rp) {
845 pmb[lp] = pmb[rp];
846 pmb[rp] = NULL;
847 rp--;
848 lp++;
849 }
850 }
851
852 /* Remember the number of running sets */
853 return rp + 1;
854 }
855
856 /*
857 * If o->color_moved is COLOR_MOVED_PLAIN, this function does nothing.
858 *
859 * Otherwise, if the last block has fewer alphanumeric characters than
860 * COLOR_MOVED_MIN_ALNUM_COUNT, unset DIFF_SYMBOL_MOVED_LINE on all lines in
861 * that block.
862 *
863 * The last block consists of the (n - block_length)'th line up to but not
864 * including the nth line.
865 *
866 * NEEDSWORK: This uses the same heuristic as blame_entry_score() in blame.c.
867 * Think of a way to unify them.
868 */
869 static void adjust_last_block(struct diff_options *o, int n, int block_length)
870 {
871 int i, alnum_count = 0;
872 if (o->color_moved == COLOR_MOVED_PLAIN)
873 return;
874 for (i = 1; i < block_length + 1; i++) {
875 const char *c = o->emitted_symbols->buf[n - i].line;
876 for (; *c; c++) {
877 if (!isalnum(*c))
878 continue;
879 alnum_count++;
880 if (alnum_count >= COLOR_MOVED_MIN_ALNUM_COUNT)
881 return;
882 }
883 }
884 for (i = 1; i < block_length + 1; i++)
885 o->emitted_symbols->buf[n - i].flags &= ~DIFF_SYMBOL_MOVED_LINE;
886 }
887
888 /* Find blocks of moved code, delegate actual coloring decision to helper */
889 static void mark_color_as_moved(struct diff_options *o,
890 struct hashmap *add_lines,
891 struct hashmap *del_lines)
892 {
893 struct moved_entry **pmb = NULL; /* potentially moved blocks */
894 int pmb_nr = 0, pmb_alloc = 0;
895 int n, flipped_block = 1, block_length = 0;
896
897
898 for (n = 0; n < o->emitted_symbols->nr; n++) {
899 struct hashmap *hm = NULL;
900 struct moved_entry *key;
901 struct moved_entry *match = NULL;
902 struct emitted_diff_symbol *l = &o->emitted_symbols->buf[n];
903 int i;
904
905 switch (l->s) {
906 case DIFF_SYMBOL_PLUS:
907 hm = del_lines;
908 key = prepare_entry(o, n);
909 match = hashmap_get(hm, key, o);
910 free(key);
911 break;
912 case DIFF_SYMBOL_MINUS:
913 hm = add_lines;
914 key = prepare_entry(o, n);
915 match = hashmap_get(hm, key, o);
916 free(key);
917 break;
918 default:
919 flipped_block = 1;
920 }
921
922 if (!match) {
923 adjust_last_block(o, n, block_length);
924 pmb_nr = 0;
925 block_length = 0;
926 continue;
927 }
928
929 l->flags |= DIFF_SYMBOL_MOVED_LINE;
930
931 if (o->color_moved == COLOR_MOVED_PLAIN)
932 continue;
933
934 /* Check any potential block runs, advance each or nullify */
935 for (i = 0; i < pmb_nr; i++) {
936 struct moved_entry *p = pmb[i];
937 struct moved_entry *pnext = (p && p->next_line) ?
938 p->next_line : NULL;
939 if (pnext && !hm->cmpfn(o, pnext, match, NULL)) {
940 pmb[i] = p->next_line;
941 } else {
942 pmb[i] = NULL;
943 }
944 }
945
946 pmb_nr = shrink_potential_moved_blocks(pmb, pmb_nr);
947
948 if (pmb_nr == 0) {
949 /*
950 * The current line is the start of a new block.
951 * Setup the set of potential blocks.
952 */
953 for (; match; match = hashmap_get_next(hm, match)) {
954 ALLOC_GROW(pmb, pmb_nr + 1, pmb_alloc);
955 pmb[pmb_nr++] = match;
956 }
957
958 flipped_block = (flipped_block + 1) % 2;
959
960 adjust_last_block(o, n, block_length);
961 block_length = 0;
962 }
963
964 block_length++;
965
966 if (flipped_block)
967 l->flags |= DIFF_SYMBOL_MOVED_LINE_ALT;
968 }
969 adjust_last_block(o, n, block_length);
970
971 free(pmb);
972 }
973
974 #define DIFF_SYMBOL_MOVED_LINE_ZEBRA_MASK \
975 (DIFF_SYMBOL_MOVED_LINE | DIFF_SYMBOL_MOVED_LINE_ALT)
976 static void dim_moved_lines(struct diff_options *o)
977 {
978 int n;
979 for (n = 0; n < o->emitted_symbols->nr; n++) {
980 struct emitted_diff_symbol *prev = (n != 0) ?
981 &o->emitted_symbols->buf[n - 1] : NULL;
982 struct emitted_diff_symbol *l = &o->emitted_symbols->buf[n];
983 struct emitted_diff_symbol *next =
984 (n < o->emitted_symbols->nr - 1) ?
985 &o->emitted_symbols->buf[n + 1] : NULL;
986
987 /* Not a plus or minus line? */
988 if (l->s != DIFF_SYMBOL_PLUS && l->s != DIFF_SYMBOL_MINUS)
989 continue;
990
991 /* Not a moved line? */
992 if (!(l->flags & DIFF_SYMBOL_MOVED_LINE))
993 continue;
994
995 /*
996 * If prev or next are not a plus or minus line,
997 * pretend they don't exist
998 */
999 if (prev && prev->s != DIFF_SYMBOL_PLUS &&
1000 prev->s != DIFF_SYMBOL_MINUS)
1001 prev = NULL;
1002 if (next && next->s != DIFF_SYMBOL_PLUS &&
1003 next->s != DIFF_SYMBOL_MINUS)
1004 next = NULL;
1005
1006 /* Inside a block? */
1007 if ((prev &&
1008 (prev->flags & DIFF_SYMBOL_MOVED_LINE_ZEBRA_MASK) ==
1009 (l->flags & DIFF_SYMBOL_MOVED_LINE_ZEBRA_MASK)) &&
1010 (next &&
1011 (next->flags & DIFF_SYMBOL_MOVED_LINE_ZEBRA_MASK) ==
1012 (l->flags & DIFF_SYMBOL_MOVED_LINE_ZEBRA_MASK))) {
1013 l->flags |= DIFF_SYMBOL_MOVED_LINE_UNINTERESTING;
1014 continue;
1015 }
1016
1017 /* Check if we are at an interesting bound: */
1018 if (prev && (prev->flags & DIFF_SYMBOL_MOVED_LINE) &&
1019 (prev->flags & DIFF_SYMBOL_MOVED_LINE_ALT) !=
1020 (l->flags & DIFF_SYMBOL_MOVED_LINE_ALT))
1021 continue;
1022 if (next && (next->flags & DIFF_SYMBOL_MOVED_LINE) &&
1023 (next->flags & DIFF_SYMBOL_MOVED_LINE_ALT) !=
1024 (l->flags & DIFF_SYMBOL_MOVED_LINE_ALT))
1025 continue;
1026
1027 /*
1028 * The boundary to prev and next are not interesting,
1029 * so this line is not interesting as a whole
1030 */
1031 l->flags |= DIFF_SYMBOL_MOVED_LINE_UNINTERESTING;
1032 }
1033 }
1034
1035 static void emit_line_ws_markup(struct diff_options *o,
1036 const char *set, const char *reset,
1037 const char *line, int len, char sign,
1038 unsigned ws_rule, int blank_at_eof)
1039 {
1040 const char *ws = NULL;
1041
1042 if (o->ws_error_highlight & ws_rule) {
1043 ws = diff_get_color_opt(o, DIFF_WHITESPACE);
1044 if (!*ws)
1045 ws = NULL;
1046 }
1047
1048 if (!ws)
1049 emit_line_0(o, set, reset, sign, line, len);
1050 else if (blank_at_eof)
1051 /* Blank line at EOF - paint '+' as well */
1052 emit_line_0(o, ws, reset, sign, line, len);
1053 else {
1054 /* Emit just the prefix, then the rest. */
1055 emit_line_0(o, set, reset, sign, "", 0);
1056 ws_check_emit(line, len, ws_rule,
1057 o->file, set, reset, ws);
1058 }
1059 }
1060
1061 static void emit_diff_symbol_from_struct(struct diff_options *o,
1062 struct emitted_diff_symbol *eds)
1063 {
1064 static const char *nneof = " No newline at end of file\n";
1065 const char *context, *reset, *set, *meta, *fraginfo;
1066 struct strbuf sb = STRBUF_INIT;
1067
1068 enum diff_symbol s = eds->s;
1069 const char *line = eds->line;
1070 int len = eds->len;
1071 unsigned flags = eds->flags;
1072
1073 switch (s) {
1074 case DIFF_SYMBOL_NO_LF_EOF:
1075 context = diff_get_color_opt(o, DIFF_CONTEXT);
1076 reset = diff_get_color_opt(o, DIFF_RESET);
1077 putc('\n', o->file);
1078 emit_line_0(o, context, reset, '\\',
1079 nneof, strlen(nneof));
1080 break;
1081 case DIFF_SYMBOL_SUBMODULE_HEADER:
1082 case DIFF_SYMBOL_SUBMODULE_ERROR:
1083 case DIFF_SYMBOL_SUBMODULE_PIPETHROUGH:
1084 case DIFF_SYMBOL_STATS_SUMMARY_INSERTS_DELETES:
1085 case DIFF_SYMBOL_SUMMARY:
1086 case DIFF_SYMBOL_STATS_LINE:
1087 case DIFF_SYMBOL_BINARY_DIFF_BODY:
1088 case DIFF_SYMBOL_CONTEXT_FRAGINFO:
1089 emit_line(o, "", "", line, len);
1090 break;
1091 case DIFF_SYMBOL_CONTEXT_INCOMPLETE:
1092 case DIFF_SYMBOL_CONTEXT_MARKER:
1093 context = diff_get_color_opt(o, DIFF_CONTEXT);
1094 reset = diff_get_color_opt(o, DIFF_RESET);
1095 emit_line(o, context, reset, line, len);
1096 break;
1097 case DIFF_SYMBOL_SEPARATOR:
1098 fprintf(o->file, "%s%c",
1099 diff_line_prefix(o),
1100 o->line_termination);
1101 break;
1102 case DIFF_SYMBOL_CONTEXT:
1103 set = diff_get_color_opt(o, DIFF_CONTEXT);
1104 reset = diff_get_color_opt(o, DIFF_RESET);
1105 emit_line_ws_markup(o, set, reset, line, len, ' ',
1106 flags & (DIFF_SYMBOL_CONTENT_WS_MASK), 0);
1107 break;
1108 case DIFF_SYMBOL_PLUS:
1109 switch (flags & (DIFF_SYMBOL_MOVED_LINE |
1110 DIFF_SYMBOL_MOVED_LINE_ALT |
1111 DIFF_SYMBOL_MOVED_LINE_UNINTERESTING)) {
1112 case DIFF_SYMBOL_MOVED_LINE |
1113 DIFF_SYMBOL_MOVED_LINE_ALT |
1114 DIFF_SYMBOL_MOVED_LINE_UNINTERESTING:
1115 set = diff_get_color_opt(o, DIFF_FILE_NEW_MOVED_ALT_DIM);
1116 break;
1117 case DIFF_SYMBOL_MOVED_LINE |
1118 DIFF_SYMBOL_MOVED_LINE_ALT:
1119 set = diff_get_color_opt(o, DIFF_FILE_NEW_MOVED_ALT);
1120 break;
1121 case DIFF_SYMBOL_MOVED_LINE |
1122 DIFF_SYMBOL_MOVED_LINE_UNINTERESTING:
1123 set = diff_get_color_opt(o, DIFF_FILE_NEW_MOVED_DIM);
1124 break;
1125 case DIFF_SYMBOL_MOVED_LINE:
1126 set = diff_get_color_opt(o, DIFF_FILE_NEW_MOVED);
1127 break;
1128 default:
1129 set = diff_get_color_opt(o, DIFF_FILE_NEW);
1130 }
1131 reset = diff_get_color_opt(o, DIFF_RESET);
1132 emit_line_ws_markup(o, set, reset, line, len, '+',
1133 flags & DIFF_SYMBOL_CONTENT_WS_MASK,
1134 flags & DIFF_SYMBOL_CONTENT_BLANK_LINE_EOF);
1135 break;
1136 case DIFF_SYMBOL_MINUS:
1137 switch (flags & (DIFF_SYMBOL_MOVED_LINE |
1138 DIFF_SYMBOL_MOVED_LINE_ALT |
1139 DIFF_SYMBOL_MOVED_LINE_UNINTERESTING)) {
1140 case DIFF_SYMBOL_MOVED_LINE |
1141 DIFF_SYMBOL_MOVED_LINE_ALT |
1142 DIFF_SYMBOL_MOVED_LINE_UNINTERESTING:
1143 set = diff_get_color_opt(o, DIFF_FILE_OLD_MOVED_ALT_DIM);
1144 break;
1145 case DIFF_SYMBOL_MOVED_LINE |
1146 DIFF_SYMBOL_MOVED_LINE_ALT:
1147 set = diff_get_color_opt(o, DIFF_FILE_OLD_MOVED_ALT);
1148 break;
1149 case DIFF_SYMBOL_MOVED_LINE |
1150 DIFF_SYMBOL_MOVED_LINE_UNINTERESTING:
1151 set = diff_get_color_opt(o, DIFF_FILE_OLD_MOVED_DIM);
1152 break;
1153 case DIFF_SYMBOL_MOVED_LINE:
1154 set = diff_get_color_opt(o, DIFF_FILE_OLD_MOVED);
1155 break;
1156 default:
1157 set = diff_get_color_opt(o, DIFF_FILE_OLD);
1158 }
1159 reset = diff_get_color_opt(o, DIFF_RESET);
1160 emit_line_ws_markup(o, set, reset, line, len, '-',
1161 flags & DIFF_SYMBOL_CONTENT_WS_MASK, 0);
1162 break;
1163 case DIFF_SYMBOL_WORDS_PORCELAIN:
1164 context = diff_get_color_opt(o, DIFF_CONTEXT);
1165 reset = diff_get_color_opt(o, DIFF_RESET);
1166 emit_line(o, context, reset, line, len);
1167 fputs("~\n", o->file);
1168 break;
1169 case DIFF_SYMBOL_WORDS:
1170 context = diff_get_color_opt(o, DIFF_CONTEXT);
1171 reset = diff_get_color_opt(o, DIFF_RESET);
1172 /*
1173 * Skip the prefix character, if any. With
1174 * diff_suppress_blank_empty, there may be
1175 * none.
1176 */
1177 if (line[0] != '\n') {
1178 line++;
1179 len--;
1180 }
1181 emit_line(o, context, reset, line, len);
1182 break;
1183 case DIFF_SYMBOL_FILEPAIR_PLUS:
1184 meta = diff_get_color_opt(o, DIFF_METAINFO);
1185 reset = diff_get_color_opt(o, DIFF_RESET);
1186 fprintf(o->file, "%s%s+++ %s%s%s\n", diff_line_prefix(o), meta,
1187 line, reset,
1188 strchr(line, ' ') ? "\t" : "");
1189 break;
1190 case DIFF_SYMBOL_FILEPAIR_MINUS:
1191 meta = diff_get_color_opt(o, DIFF_METAINFO);
1192 reset = diff_get_color_opt(o, DIFF_RESET);
1193 fprintf(o->file, "%s%s--- %s%s%s\n", diff_line_prefix(o), meta,
1194 line, reset,
1195 strchr(line, ' ') ? "\t" : "");
1196 break;
1197 case DIFF_SYMBOL_BINARY_FILES:
1198 case DIFF_SYMBOL_HEADER:
1199 fprintf(o->file, "%s", line);
1200 break;
1201 case DIFF_SYMBOL_BINARY_DIFF_HEADER:
1202 fprintf(o->file, "%sGIT binary patch\n", diff_line_prefix(o));
1203 break;
1204 case DIFF_SYMBOL_BINARY_DIFF_HEADER_DELTA:
1205 fprintf(o->file, "%sdelta %s\n", diff_line_prefix(o), line);
1206 break;
1207 case DIFF_SYMBOL_BINARY_DIFF_HEADER_LITERAL:
1208 fprintf(o->file, "%sliteral %s\n", diff_line_prefix(o), line);
1209 break;
1210 case DIFF_SYMBOL_BINARY_DIFF_FOOTER:
1211 fputs(diff_line_prefix(o), o->file);
1212 fputc('\n', o->file);
1213 break;
1214 case DIFF_SYMBOL_REWRITE_DIFF:
1215 fraginfo = diff_get_color(o->use_color, DIFF_FRAGINFO);
1216 reset = diff_get_color_opt(o, DIFF_RESET);
1217 emit_line(o, fraginfo, reset, line, len);
1218 break;
1219 case DIFF_SYMBOL_SUBMODULE_ADD:
1220 set = diff_get_color_opt(o, DIFF_FILE_NEW);
1221 reset = diff_get_color_opt(o, DIFF_RESET);
1222 emit_line(o, set, reset, line, len);
1223 break;
1224 case DIFF_SYMBOL_SUBMODULE_DEL:
1225 set = diff_get_color_opt(o, DIFF_FILE_OLD);
1226 reset = diff_get_color_opt(o, DIFF_RESET);
1227 emit_line(o, set, reset, line, len);
1228 break;
1229 case DIFF_SYMBOL_SUBMODULE_UNTRACKED:
1230 fprintf(o->file, "%sSubmodule %s contains untracked content\n",
1231 diff_line_prefix(o), line);
1232 break;
1233 case DIFF_SYMBOL_SUBMODULE_MODIFIED:
1234 fprintf(o->file, "%sSubmodule %s contains modified content\n",
1235 diff_line_prefix(o), line);
1236 break;
1237 case DIFF_SYMBOL_STATS_SUMMARY_NO_FILES:
1238 emit_line(o, "", "", " 0 files changed\n",
1239 strlen(" 0 files changed\n"));
1240 break;
1241 case DIFF_SYMBOL_STATS_SUMMARY_ABBREV:
1242 emit_line(o, "", "", " ...\n", strlen(" ...\n"));
1243 break;
1244 case DIFF_SYMBOL_WORD_DIFF:
1245 fprintf(o->file, "%.*s", len, line);
1246 break;
1247 case DIFF_SYMBOL_STAT_SEP:
1248 fputs(o->stat_sep, o->file);
1249 break;
1250 default:
1251 die("BUG: unknown diff symbol");
1252 }
1253 strbuf_release(&sb);
1254 }
1255
1256 static void emit_diff_symbol(struct diff_options *o, enum diff_symbol s,
1257 const char *line, int len, unsigned flags)
1258 {
1259 struct emitted_diff_symbol e = {line, len, flags, s};
1260
1261 if (o->emitted_symbols)
1262 append_emitted_diff_symbol(o, &e);
1263 else
1264 emit_diff_symbol_from_struct(o, &e);
1265 }
1266
1267 void diff_emit_submodule_del(struct diff_options *o, const char *line)
1268 {
1269 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_DEL, line, strlen(line), 0);
1270 }
1271
1272 void diff_emit_submodule_add(struct diff_options *o, const char *line)
1273 {
1274 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_ADD, line, strlen(line), 0);
1275 }
1276
1277 void diff_emit_submodule_untracked(struct diff_options *o, const char *path)
1278 {
1279 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_UNTRACKED,
1280 path, strlen(path), 0);
1281 }
1282
1283 void diff_emit_submodule_modified(struct diff_options *o, const char *path)
1284 {
1285 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_MODIFIED,
1286 path, strlen(path), 0);
1287 }
1288
1289 void diff_emit_submodule_header(struct diff_options *o, const char *header)
1290 {
1291 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_HEADER,
1292 header, strlen(header), 0);
1293 }
1294
1295 void diff_emit_submodule_error(struct diff_options *o, const char *err)
1296 {
1297 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_ERROR, err, strlen(err), 0);
1298 }
1299
1300 void diff_emit_submodule_pipethrough(struct diff_options *o,
1301 const char *line, int len)
1302 {
1303 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_PIPETHROUGH, line, len, 0);
1304 }
1305
1306 static int new_blank_line_at_eof(struct emit_callback *ecbdata, const char *line, int len)
1307 {
1308 if (!((ecbdata->ws_rule & WS_BLANK_AT_EOF) &&
1309 ecbdata->blank_at_eof_in_preimage &&
1310 ecbdata->blank_at_eof_in_postimage &&
1311 ecbdata->blank_at_eof_in_preimage <= ecbdata->lno_in_preimage &&
1312 ecbdata->blank_at_eof_in_postimage <= ecbdata->lno_in_postimage))
1313 return 0;
1314 return ws_blank_line(line, len, ecbdata->ws_rule);
1315 }
1316
1317 static void emit_add_line(const char *reset,
1318 struct emit_callback *ecbdata,
1319 const char *line, int len)
1320 {
1321 unsigned flags = WSEH_NEW | ecbdata->ws_rule;
1322 if (new_blank_line_at_eof(ecbdata, line, len))
1323 flags |= DIFF_SYMBOL_CONTENT_BLANK_LINE_EOF;
1324
1325 emit_diff_symbol(ecbdata->opt, DIFF_SYMBOL_PLUS, line, len, flags);
1326 }
1327
1328 static void emit_del_line(const char *reset,
1329 struct emit_callback *ecbdata,
1330 const char *line, int len)
1331 {
1332 unsigned flags = WSEH_OLD | ecbdata->ws_rule;
1333 emit_diff_symbol(ecbdata->opt, DIFF_SYMBOL_MINUS, line, len, flags);
1334 }
1335
1336 static void emit_context_line(const char *reset,
1337 struct emit_callback *ecbdata,
1338 const char *line, int len)
1339 {
1340 unsigned flags = WSEH_CONTEXT | ecbdata->ws_rule;
1341 emit_diff_symbol(ecbdata->opt, DIFF_SYMBOL_CONTEXT, line, len, flags);
1342 }
1343
1344 static void emit_hunk_header(struct emit_callback *ecbdata,
1345 const char *line, int len)
1346 {
1347 const char *context = diff_get_color(ecbdata->color_diff, DIFF_CONTEXT);
1348 const char *frag = diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO);
1349 const char *func = diff_get_color(ecbdata->color_diff, DIFF_FUNCINFO);
1350 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
1351 static const char atat[2] = { '@', '@' };
1352 const char *cp, *ep;
1353 struct strbuf msgbuf = STRBUF_INIT;
1354 int org_len = len;
1355 int i = 1;
1356
1357 /*
1358 * As a hunk header must begin with "@@ -<old>, +<new> @@",
1359 * it always is at least 10 bytes long.
1360 */
1361 if (len < 10 ||
1362 memcmp(line, atat, 2) ||
1363 !(ep = memmem(line + 2, len - 2, atat, 2))) {
1364 emit_diff_symbol(ecbdata->opt,
1365 DIFF_SYMBOL_CONTEXT_MARKER, line, len, 0);
1366 return;
1367 }
1368 ep += 2; /* skip over @@ */
1369
1370 /* The hunk header in fraginfo color */
1371 strbuf_addstr(&msgbuf, frag);
1372 strbuf_add(&msgbuf, line, ep - line);
1373 strbuf_addstr(&msgbuf, reset);
1374
1375 /*
1376 * trailing "\r\n"
1377 */
1378 for ( ; i < 3; i++)
1379 if (line[len - i] == '\r' || line[len - i] == '\n')
1380 len--;
1381
1382 /* blank before the func header */
1383 for (cp = ep; ep - line < len; ep++)
1384 if (*ep != ' ' && *ep != '\t')
1385 break;
1386 if (ep != cp) {
1387 strbuf_addstr(&msgbuf, context);
1388 strbuf_add(&msgbuf, cp, ep - cp);
1389 strbuf_addstr(&msgbuf, reset);
1390 }
1391
1392 if (ep < line + len) {
1393 strbuf_addstr(&msgbuf, func);
1394 strbuf_add(&msgbuf, ep, line + len - ep);
1395 strbuf_addstr(&msgbuf, reset);
1396 }
1397
1398 strbuf_add(&msgbuf, line + len, org_len - len);
1399 strbuf_complete_line(&msgbuf);
1400 emit_diff_symbol(ecbdata->opt,
1401 DIFF_SYMBOL_CONTEXT_FRAGINFO, msgbuf.buf, msgbuf.len, 0);
1402 strbuf_release(&msgbuf);
1403 }
1404
1405 static struct diff_tempfile *claim_diff_tempfile(void) {
1406 int i;
1407 for (i = 0; i < ARRAY_SIZE(diff_temp); i++)
1408 if (!diff_temp[i].name)
1409 return diff_temp + i;
1410 die("BUG: diff is failing to clean up its tempfiles");
1411 }
1412
1413 static void remove_tempfile(void)
1414 {
1415 int i;
1416 for (i = 0; i < ARRAY_SIZE(diff_temp); i++) {
1417 if (is_tempfile_active(diff_temp[i].tempfile))
1418 delete_tempfile(&diff_temp[i].tempfile);
1419 diff_temp[i].name = NULL;
1420 }
1421 }
1422
1423 static void add_line_count(struct strbuf *out, int count)
1424 {
1425 switch (count) {
1426 case 0:
1427 strbuf_addstr(out, "0,0");
1428 break;
1429 case 1:
1430 strbuf_addstr(out, "1");
1431 break;
1432 default:
1433 strbuf_addf(out, "1,%d", count);
1434 break;
1435 }
1436 }
1437
1438 static void emit_rewrite_lines(struct emit_callback *ecb,
1439 int prefix, const char *data, int size)
1440 {
1441 const char *endp = NULL;
1442 const char *reset = diff_get_color(ecb->color_diff, DIFF_RESET);
1443
1444 while (0 < size) {
1445 int len;
1446
1447 endp = memchr(data, '\n', size);
1448 len = endp ? (endp - data + 1) : size;
1449 if (prefix != '+') {
1450 ecb->lno_in_preimage++;
1451 emit_del_line(reset, ecb, data, len);
1452 } else {
1453 ecb->lno_in_postimage++;
1454 emit_add_line(reset, ecb, data, len);
1455 }
1456 size -= len;
1457 data += len;
1458 }
1459 if (!endp)
1460 emit_diff_symbol(ecb->opt, DIFF_SYMBOL_NO_LF_EOF, NULL, 0, 0);
1461 }
1462
1463 static void emit_rewrite_diff(const char *name_a,
1464 const char *name_b,
1465 struct diff_filespec *one,
1466 struct diff_filespec *two,
1467 struct userdiff_driver *textconv_one,
1468 struct userdiff_driver *textconv_two,
1469 struct diff_options *o)
1470 {
1471 int lc_a, lc_b;
1472 static struct strbuf a_name = STRBUF_INIT, b_name = STRBUF_INIT;
1473 const char *a_prefix, *b_prefix;
1474 char *data_one, *data_two;
1475 size_t size_one, size_two;
1476 struct emit_callback ecbdata;
1477 struct strbuf out = STRBUF_INIT;
1478
1479 if (diff_mnemonic_prefix && DIFF_OPT_TST(o, REVERSE_DIFF)) {
1480 a_prefix = o->b_prefix;
1481 b_prefix = o->a_prefix;
1482 } else {
1483 a_prefix = o->a_prefix;
1484 b_prefix = o->b_prefix;
1485 }
1486
1487 name_a += (*name_a == '/');
1488 name_b += (*name_b == '/');
1489
1490 strbuf_reset(&a_name);
1491 strbuf_reset(&b_name);
1492 quote_two_c_style(&a_name, a_prefix, name_a, 0);
1493 quote_two_c_style(&b_name, b_prefix, name_b, 0);
1494
1495 size_one = fill_textconv(textconv_one, one, &data_one);
1496 size_two = fill_textconv(textconv_two, two, &data_two);
1497
1498 memset(&ecbdata, 0, sizeof(ecbdata));
1499 ecbdata.color_diff = want_color(o->use_color);
1500 ecbdata.ws_rule = whitespace_rule(name_b);
1501 ecbdata.opt = o;
1502 if (ecbdata.ws_rule & WS_BLANK_AT_EOF) {
1503 mmfile_t mf1, mf2;
1504 mf1.ptr = (char *)data_one;
1505 mf2.ptr = (char *)data_two;
1506 mf1.size = size_one;
1507 mf2.size = size_two;
1508 check_blank_at_eof(&mf1, &mf2, &ecbdata);
1509 }
1510 ecbdata.lno_in_preimage = 1;
1511 ecbdata.lno_in_postimage = 1;
1512
1513 lc_a = count_lines(data_one, size_one);
1514 lc_b = count_lines(data_two, size_two);
1515
1516 emit_diff_symbol(o, DIFF_SYMBOL_FILEPAIR_MINUS,
1517 a_name.buf, a_name.len, 0);
1518 emit_diff_symbol(o, DIFF_SYMBOL_FILEPAIR_PLUS,
1519 b_name.buf, b_name.len, 0);
1520
1521 strbuf_addstr(&out, "@@ -");
1522 if (!o->irreversible_delete)
1523 add_line_count(&out, lc_a);
1524 else
1525 strbuf_addstr(&out, "?,?");
1526 strbuf_addstr(&out, " +");
1527 add_line_count(&out, lc_b);
1528 strbuf_addstr(&out, " @@\n");
1529 emit_diff_symbol(o, DIFF_SYMBOL_REWRITE_DIFF, out.buf, out.len, 0);
1530 strbuf_release(&out);
1531
1532 if (lc_a && !o->irreversible_delete)
1533 emit_rewrite_lines(&ecbdata, '-', data_one, size_one);
1534 if (lc_b)
1535 emit_rewrite_lines(&ecbdata, '+', data_two, size_two);
1536 if (textconv_one)
1537 free((char *)data_one);
1538 if (textconv_two)
1539 free((char *)data_two);
1540 }
1541
1542 struct diff_words_buffer {
1543 mmfile_t text;
1544 unsigned long alloc;
1545 struct diff_words_orig {
1546 const char *begin, *end;
1547 } *orig;
1548 int orig_nr, orig_alloc;
1549 };
1550
1551 static void diff_words_append(char *line, unsigned long len,
1552 struct diff_words_buffer *buffer)
1553 {
1554 ALLOC_GROW(buffer->text.ptr, buffer->text.size + len, buffer->alloc);
1555 line++;
1556 len--;
1557 memcpy(buffer->text.ptr + buffer->text.size, line, len);
1558 buffer->text.size += len;
1559 buffer->text.ptr[buffer->text.size] = '\0';
1560 }
1561
1562 struct diff_words_style_elem {
1563 const char *prefix;
1564 const char *suffix;
1565 const char *color; /* NULL; filled in by the setup code if
1566 * color is enabled */
1567 };
1568
1569 struct diff_words_style {
1570 enum diff_words_type type;
1571 struct diff_words_style_elem new, old, ctx;
1572 const char *newline;
1573 };
1574
1575 static struct diff_words_style diff_words_styles[] = {
1576 { DIFF_WORDS_PORCELAIN, {"+", "\n"}, {"-", "\n"}, {" ", "\n"}, "~\n" },
1577 { DIFF_WORDS_PLAIN, {"{+", "+}"}, {"[-", "-]"}, {"", ""}, "\n" },
1578 { DIFF_WORDS_COLOR, {"", ""}, {"", ""}, {"", ""}, "\n" }
1579 };
1580
1581 struct diff_words_data {
1582 struct diff_words_buffer minus, plus;
1583 const char *current_plus;
1584 int last_minus;
1585 struct diff_options *opt;
1586 regex_t *word_regex;
1587 enum diff_words_type type;
1588 struct diff_words_style *style;
1589 };
1590
1591 static int fn_out_diff_words_write_helper(struct diff_options *o,
1592 struct diff_words_style_elem *st_el,
1593 const char *newline,
1594 size_t count, const char *buf)
1595 {
1596 int print = 0;
1597 struct strbuf sb = STRBUF_INIT;
1598
1599 while (count) {
1600 char *p = memchr(buf, '\n', count);
1601 if (print)
1602 strbuf_addstr(&sb, diff_line_prefix(o));
1603
1604 if (p != buf) {
1605 const char *reset = st_el->color && *st_el->color ?
1606 GIT_COLOR_RESET : NULL;
1607 if (st_el->color && *st_el->color)
1608 strbuf_addstr(&sb, st_el->color);
1609 strbuf_addstr(&sb, st_el->prefix);
1610 strbuf_add(&sb, buf, p ? p - buf : count);
1611 strbuf_addstr(&sb, st_el->suffix);
1612 if (reset)
1613 strbuf_addstr(&sb, reset);
1614 }
1615 if (!p)
1616 goto out;
1617
1618 strbuf_addstr(&sb, newline);
1619 count -= p + 1 - buf;
1620 buf = p + 1;
1621 print = 1;
1622 if (count) {
1623 emit_diff_symbol(o, DIFF_SYMBOL_WORD_DIFF,
1624 sb.buf, sb.len, 0);
1625 strbuf_reset(&sb);
1626 }
1627 }
1628
1629 out:
1630 if (sb.len)
1631 emit_diff_symbol(o, DIFF_SYMBOL_WORD_DIFF,
1632 sb.buf, sb.len, 0);
1633 strbuf_release(&sb);
1634 return 0;
1635 }
1636
1637 /*
1638 * '--color-words' algorithm can be described as:
1639 *
1640 * 1. collect the minus/plus lines of a diff hunk, divided into
1641 * minus-lines and plus-lines;
1642 *
1643 * 2. break both minus-lines and plus-lines into words and
1644 * place them into two mmfile_t with one word for each line;
1645 *
1646 * 3. use xdiff to run diff on the two mmfile_t to get the words level diff;
1647 *
1648 * And for the common parts of the both file, we output the plus side text.
1649 * diff_words->current_plus is used to trace the current position of the plus file
1650 * which printed. diff_words->last_minus is used to trace the last minus word
1651 * printed.
1652 *
1653 * For '--graph' to work with '--color-words', we need to output the graph prefix
1654 * on each line of color words output. Generally, there are two conditions on
1655 * which we should output the prefix.
1656 *
1657 * 1. diff_words->last_minus == 0 &&
1658 * diff_words->current_plus == diff_words->plus.text.ptr
1659 *
1660 * that is: the plus text must start as a new line, and if there is no minus
1661 * word printed, a graph prefix must be printed.
1662 *
1663 * 2. diff_words->current_plus > diff_words->plus.text.ptr &&
1664 * *(diff_words->current_plus - 1) == '\n'
1665 *
1666 * that is: a graph prefix must be printed following a '\n'
1667 */
1668 static int color_words_output_graph_prefix(struct diff_words_data *diff_words)
1669 {
1670 if ((diff_words->last_minus == 0 &&
1671 diff_words->current_plus == diff_words->plus.text.ptr) ||
1672 (diff_words->current_plus > diff_words->plus.text.ptr &&
1673 *(diff_words->current_plus - 1) == '\n')) {
1674 return 1;
1675 } else {
1676 return 0;
1677 }
1678 }
1679
1680 static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
1681 {
1682 struct diff_words_data *diff_words = priv;
1683 struct diff_words_style *style = diff_words->style;
1684 int minus_first, minus_len, plus_first, plus_len;
1685 const char *minus_begin, *minus_end, *plus_begin, *plus_end;
1686 struct diff_options *opt = diff_words->opt;
1687 const char *line_prefix;
1688
1689 if (line[0] != '@' || parse_hunk_header(line, len,
1690 &minus_first, &minus_len, &plus_first, &plus_len))
1691 return;
1692
1693 assert(opt);
1694 line_prefix = diff_line_prefix(opt);
1695
1696 /* POSIX requires that first be decremented by one if len == 0... */
1697 if (minus_len) {
1698 minus_begin = diff_words->minus.orig[minus_first].begin;
1699 minus_end =
1700 diff_words->minus.orig[minus_first + minus_len - 1].end;
1701 } else
1702 minus_begin = minus_end =
1703 diff_words->minus.orig[minus_first].end;
1704
1705 if (plus_len) {
1706 plus_begin = diff_words->plus.orig[plus_first].begin;
1707 plus_end = diff_words->plus.orig[plus_first + plus_len - 1].end;
1708 } else
1709 plus_begin = plus_end = diff_words->plus.orig[plus_first].end;
1710
1711 if (color_words_output_graph_prefix(diff_words)) {
1712 fputs(line_prefix, diff_words->opt->file);
1713 }
1714 if (diff_words->current_plus != plus_begin) {
1715 fn_out_diff_words_write_helper(diff_words->opt,
1716 &style->ctx, style->newline,
1717 plus_begin - diff_words->current_plus,
1718 diff_words->current_plus);
1719 }
1720 if (minus_begin != minus_end) {
1721 fn_out_diff_words_write_helper(diff_words->opt,
1722 &style->old, style->newline,
1723 minus_end - minus_begin, minus_begin);
1724 }
1725 if (plus_begin != plus_end) {
1726 fn_out_diff_words_write_helper(diff_words->opt,
1727 &style->new, style->newline,
1728 plus_end - plus_begin, plus_begin);
1729 }
1730
1731 diff_words->current_plus = plus_end;
1732 diff_words->last_minus = minus_first;
1733 }
1734
1735 /* This function starts looking at *begin, and returns 0 iff a word was found. */
1736 static int find_word_boundaries(mmfile_t *buffer, regex_t *word_regex,
1737 int *begin, int *end)
1738 {
1739 if (word_regex && *begin < buffer->size) {
1740 regmatch_t match[1];
1741 if (!regexec_buf(word_regex, buffer->ptr + *begin,
1742 buffer->size - *begin, 1, match, 0)) {
1743 char *p = memchr(buffer->ptr + *begin + match[0].rm_so,
1744 '\n', match[0].rm_eo - match[0].rm_so);
1745 *end = p ? p - buffer->ptr : match[0].rm_eo + *begin;
1746 *begin += match[0].rm_so;
1747 return *begin >= *end;
1748 }
1749 return -1;
1750 }
1751
1752 /* find the next word */
1753 while (*begin < buffer->size && isspace(buffer->ptr[*begin]))
1754 (*begin)++;
1755 if (*begin >= buffer->size)
1756 return -1;
1757
1758 /* find the end of the word */
1759 *end = *begin + 1;
1760 while (*end < buffer->size && !isspace(buffer->ptr[*end]))
1761 (*end)++;
1762
1763 return 0;
1764 }
1765
1766 /*
1767 * This function splits the words in buffer->text, stores the list with
1768 * newline separator into out, and saves the offsets of the original words
1769 * in buffer->orig.
1770 */
1771 static void diff_words_fill(struct diff_words_buffer *buffer, mmfile_t *out,
1772 regex_t *word_regex)
1773 {
1774 int i, j;
1775 long alloc = 0;
1776
1777 out->size = 0;
1778 out->ptr = NULL;
1779
1780 /* fake an empty "0th" word */
1781 ALLOC_GROW(buffer->orig, 1, buffer->orig_alloc);
1782 buffer->orig[0].begin = buffer->orig[0].end = buffer->text.ptr;
1783 buffer->orig_nr = 1;
1784
1785 for (i = 0; i < buffer->text.size; i++) {
1786 if (find_word_boundaries(&buffer->text, word_regex, &i, &j))
1787 return;
1788
1789 /* store original boundaries */
1790 ALLOC_GROW(buffer->orig, buffer->orig_nr + 1,
1791 buffer->orig_alloc);
1792 buffer->orig[buffer->orig_nr].begin = buffer->text.ptr + i;
1793 buffer->orig[buffer->orig_nr].end = buffer->text.ptr + j;
1794 buffer->orig_nr++;
1795
1796 /* store one word */
1797 ALLOC_GROW(out->ptr, out->size + j - i + 1, alloc);
1798 memcpy(out->ptr + out->size, buffer->text.ptr + i, j - i);
1799 out->ptr[out->size + j - i] = '\n';
1800 out->size += j - i + 1;
1801
1802 i = j - 1;
1803 }
1804 }
1805
1806 /* this executes the word diff on the accumulated buffers */
1807 static void diff_words_show(struct diff_words_data *diff_words)
1808 {
1809 xpparam_t xpp;
1810 xdemitconf_t xecfg;
1811 mmfile_t minus, plus;
1812 struct diff_words_style *style = diff_words->style;
1813
1814 struct diff_options *opt = diff_words->opt;
1815 const char *line_prefix;
1816
1817 assert(opt);
1818 line_prefix = diff_line_prefix(opt);
1819
1820 /* special case: only removal */
1821 if (!diff_words->plus.text.size) {
1822 emit_diff_symbol(diff_words->opt, DIFF_SYMBOL_WORD_DIFF,
1823 line_prefix, strlen(line_prefix), 0);
1824 fn_out_diff_words_write_helper(diff_words->opt,
1825 &style->old, style->newline,
1826 diff_words->minus.text.size,
1827 diff_words->minus.text.ptr);
1828 diff_words->minus.text.size = 0;
1829 return;
1830 }
1831
1832 diff_words->current_plus = diff_words->plus.text.ptr;
1833 diff_words->last_minus = 0;
1834
1835 memset(&xpp, 0, sizeof(xpp));
1836 memset(&xecfg, 0, sizeof(xecfg));
1837 diff_words_fill(&diff_words->minus, &minus, diff_words->word_regex);
1838 diff_words_fill(&diff_words->plus, &plus, diff_words->word_regex);
1839 xpp.flags = 0;
1840 /* as only the hunk header will be parsed, we need a 0-context */
1841 xecfg.ctxlen = 0;
1842 if (xdi_diff_outf(&minus, &plus, fn_out_diff_words_aux, diff_words,
1843 &xpp, &xecfg))
1844 die("unable to generate word diff");
1845 free(minus.ptr);
1846 free(plus.ptr);
1847 if (diff_words->current_plus != diff_words->plus.text.ptr +
1848 diff_words->plus.text.size) {
1849 if (color_words_output_graph_prefix(diff_words))
1850 emit_diff_symbol(diff_words->opt, DIFF_SYMBOL_WORD_DIFF,
1851 line_prefix, strlen(line_prefix), 0);
1852 fn_out_diff_words_write_helper(diff_words->opt,
1853 &style->ctx, style->newline,
1854 diff_words->plus.text.ptr + diff_words->plus.text.size
1855 - diff_words->current_plus, diff_words->current_plus);
1856 }
1857 diff_words->minus.text.size = diff_words->plus.text.size = 0;
1858 }
1859
1860 /* In "color-words" mode, show word-diff of words accumulated in the buffer */
1861 static void diff_words_flush(struct emit_callback *ecbdata)
1862 {
1863 struct diff_options *wo = ecbdata->diff_words->opt;
1864
1865 if (ecbdata->diff_words->minus.text.size ||
1866 ecbdata->diff_words->plus.text.size)
1867 diff_words_show(ecbdata->diff_words);
1868
1869 if (wo->emitted_symbols) {
1870 struct diff_options *o = ecbdata->opt;
1871 struct emitted_diff_symbols *wol = wo->emitted_symbols;
1872 int i;
1873
1874 /*
1875 * NEEDSWORK:
1876 * Instead of appending each, concat all words to a line?
1877 */
1878 for (i = 0; i < wol->nr; i++)
1879 append_emitted_diff_symbol(o, &wol->buf[i]);
1880
1881 for (i = 0; i < wol->nr; i++)
1882 free((void *)wol->buf[i].line);
1883
1884 wol->nr = 0;
1885 }
1886 }
1887
1888 static void diff_filespec_load_driver(struct diff_filespec *one)
1889 {
1890 /* Use already-loaded driver */
1891 if (one->driver)
1892 return;
1893
1894 if (S_ISREG(one->mode))
1895 one->driver = userdiff_find_by_path(one->path);
1896
1897 /* Fallback to default settings */
1898 if (!one->driver)
1899 one->driver = userdiff_find_by_name("default");
1900 }
1901
1902 static const char *userdiff_word_regex(struct diff_filespec *one)
1903 {
1904 diff_filespec_load_driver(one);
1905 return one->driver->word_regex;
1906 }
1907
1908 static void init_diff_words_data(struct emit_callback *ecbdata,
1909 struct diff_options *orig_opts,
1910 struct diff_filespec *one,
1911 struct diff_filespec *two)
1912 {
1913 int i;
1914 struct diff_options *o = xmalloc(sizeof(struct diff_options));
1915 memcpy(o, orig_opts, sizeof(struct diff_options));
1916
1917 ecbdata->diff_words =
1918 xcalloc(1, sizeof(struct diff_words_data));
1919 ecbdata->diff_words->type = o->word_diff;
1920 ecbdata->diff_words->opt = o;
1921
1922 if (orig_opts->emitted_symbols)
1923 o->emitted_symbols =
1924 xcalloc(1, sizeof(struct emitted_diff_symbols));
1925
1926 if (!o->word_regex)
1927 o->word_regex = userdiff_word_regex(one);
1928 if (!o->word_regex)
1929 o->word_regex = userdiff_word_regex(two);
1930 if (!o->word_regex)
1931 o->word_regex = diff_word_regex_cfg;
1932 if (o->word_regex) {
1933 ecbdata->diff_words->word_regex = (regex_t *)
1934 xmalloc(sizeof(regex_t));
1935 if (regcomp(ecbdata->diff_words->word_regex,
1936 o->word_regex,
1937 REG_EXTENDED | REG_NEWLINE))
1938 die ("Invalid regular expression: %s",
1939 o->word_regex);
1940 }
1941 for (i = 0; i < ARRAY_SIZE(diff_words_styles); i++) {
1942 if (o->word_diff == diff_words_styles[i].type) {
1943 ecbdata->diff_words->style =
1944 &diff_words_styles[i];
1945 break;
1946 }
1947 }
1948 if (want_color(o->use_color)) {
1949 struct diff_words_style *st = ecbdata->diff_words->style;
1950 st->old.color = diff_get_color_opt(o, DIFF_FILE_OLD);
1951 st->new.color = diff_get_color_opt(o, DIFF_FILE_NEW);
1952 st->ctx.color = diff_get_color_opt(o, DIFF_CONTEXT);
1953 }
1954 }
1955
1956 static void free_diff_words_data(struct emit_callback *ecbdata)
1957 {
1958 if (ecbdata->diff_words) {
1959 diff_words_flush(ecbdata);
1960 free (ecbdata->diff_words->opt->emitted_symbols);
1961 free (ecbdata->diff_words->opt);
1962 free (ecbdata->diff_words->minus.text.ptr);
1963 free (ecbdata->diff_words->minus.orig);
1964 free (ecbdata->diff_words->plus.text.ptr);
1965 free (ecbdata->diff_words->plus.orig);
1966 if (ecbdata->diff_words->word_regex) {
1967 regfree(ecbdata->diff_words->word_regex);
1968 free(ecbdata->diff_words->word_regex);
1969 }
1970 FREE_AND_NULL(ecbdata->diff_words);
1971 }
1972 }
1973
1974 const char *diff_get_color(int diff_use_color, enum color_diff ix)
1975 {
1976 if (want_color(diff_use_color))
1977 return diff_colors[ix];
1978 return "";
1979 }
1980
1981 const char *diff_line_prefix(struct diff_options *opt)
1982 {
1983 struct strbuf *msgbuf;
1984 if (!opt->output_prefix)
1985 return "";
1986
1987 msgbuf = opt->output_prefix(opt, opt->output_prefix_data);
1988 return msgbuf->buf;
1989 }
1990
1991 static unsigned long sane_truncate_line(struct emit_callback *ecb, char *line, unsigned long len)
1992 {
1993 const char *cp;
1994 unsigned long allot;
1995 size_t l = len;
1996
1997 cp = line;
1998 allot = l;
1999 while (0 < l) {
2000 (void) utf8_width(&cp, &l);
2001 if (!cp)
2002 break; /* truncated in the middle? */
2003 }
2004 return allot - l;
2005 }
2006
2007 static void find_lno(const char *line, struct emit_callback *ecbdata)
2008 {
2009 const char *p;
2010 ecbdata->lno_in_preimage = 0;
2011 ecbdata->lno_in_postimage = 0;
2012 p = strchr(line, '-');
2013 if (!p)
2014 return; /* cannot happen */
2015 ecbdata->lno_in_preimage = strtol(p + 1, NULL, 10);
2016 p = strchr(p, '+');
2017 if (!p)
2018 return; /* cannot happen */
2019 ecbdata->lno_in_postimage = strtol(p + 1, NULL, 10);
2020 }
2021
2022 static void fn_out_consume(void *priv, char *line, unsigned long len)
2023 {
2024 struct emit_callback *ecbdata = priv;
2025 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
2026 struct diff_options *o = ecbdata->opt;
2027
2028 o->found_changes = 1;
2029
2030 if (ecbdata->header) {
2031 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
2032 ecbdata->header->buf, ecbdata->header->len, 0);
2033 strbuf_reset(ecbdata->header);
2034 ecbdata->header = NULL;
2035 }
2036
2037 if (ecbdata->label_path[0]) {
2038 emit_diff_symbol(o, DIFF_SYMBOL_FILEPAIR_MINUS,
2039 ecbdata->label_path[0],
2040 strlen(ecbdata->label_path[0]), 0);
2041 emit_diff_symbol(o, DIFF_SYMBOL_FILEPAIR_PLUS,
2042 ecbdata->label_path[1],
2043 strlen(ecbdata->label_path[1]), 0);
2044 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
2045 }
2046
2047 if (diff_suppress_blank_empty
2048 && len == 2 && line[0] == ' ' && line[1] == '\n') {
2049 line[0] = '\n';
2050 len = 1;
2051 }
2052
2053 if (line[0] == '@') {
2054 if (ecbdata->diff_words)
2055 diff_words_flush(ecbdata);
2056 len = sane_truncate_line(ecbdata, line, len);
2057 find_lno(line, ecbdata);
2058 emit_hunk_header(ecbdata, line, len);
2059 return;
2060 }
2061
2062 if (ecbdata->diff_words) {
2063 enum diff_symbol s =
2064 ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN ?
2065 DIFF_SYMBOL_WORDS_PORCELAIN : DIFF_SYMBOL_WORDS;
2066 if (line[0] == '-') {
2067 diff_words_append(line, len,
2068 &ecbdata->diff_words->minus);
2069 return;
2070 } else if (line[0] == '+') {
2071 diff_words_append(line, len,
2072 &ecbdata->diff_words->plus);
2073 return;
2074 } else if (starts_with(line, "\\ ")) {
2075 /*
2076 * Eat the "no newline at eof" marker as if we
2077 * saw a "+" or "-" line with nothing on it,
2078 * and return without diff_words_flush() to
2079 * defer processing. If this is the end of
2080 * preimage, more "+" lines may come after it.
2081 */
2082 return;
2083 }
2084 diff_words_flush(ecbdata);
2085 emit_diff_symbol(o, s, line, len, 0);
2086 return;
2087 }
2088
2089 switch (line[0]) {
2090 case '+':
2091 ecbdata->lno_in_postimage++;
2092 emit_add_line(reset, ecbdata, line + 1, len - 1);
2093 break;
2094 case '-':
2095 ecbdata->lno_in_preimage++;
2096 emit_del_line(reset, ecbdata, line + 1, len - 1);
2097 break;
2098 case ' ':
2099 ecbdata->lno_in_postimage++;
2100 ecbdata->lno_in_preimage++;
2101 emit_context_line(reset, ecbdata, line + 1, len - 1);
2102 break;
2103 default:
2104 /* incomplete line at the end */
2105 ecbdata->lno_in_preimage++;
2106 emit_diff_symbol(o, DIFF_SYMBOL_CONTEXT_INCOMPLETE,
2107 line, len, 0);
2108 break;
2109 }
2110 }
2111
2112 static char *pprint_rename(const char *a, const char *b)
2113 {
2114 const char *old = a;
2115 const char *new = b;
2116 struct strbuf name = STRBUF_INIT;
2117 int pfx_length, sfx_length;
2118 int pfx_adjust_for_slash;
2119 int len_a = strlen(a);
2120 int len_b = strlen(b);
2121 int a_midlen, b_midlen;
2122 int qlen_a = quote_c_style(a, NULL, NULL, 0);
2123 int qlen_b = quote_c_style(b, NULL, NULL, 0);
2124
2125 if (qlen_a || qlen_b) {
2126 quote_c_style(a, &name, NULL, 0);
2127 strbuf_addstr(&name, " => ");
2128 quote_c_style(b, &name, NULL, 0);
2129 return strbuf_detach(&name, NULL);
2130 }
2131
2132 /* Find common prefix */
2133 pfx_length = 0;
2134 while (*old && *new && *old == *new) {
2135 if (*old == '/')
2136 pfx_length = old - a + 1;
2137 old++;
2138 new++;
2139 }
2140
2141 /* Find common suffix */
2142 old = a + len_a;
2143 new = b + len_b;
2144 sfx_length = 0;
2145 /*
2146 * If there is a common prefix, it must end in a slash. In
2147 * that case we let this loop run 1 into the prefix to see the
2148 * same slash.
2149 *
2150 * If there is no common prefix, we cannot do this as it would
2151 * underrun the input strings.
2152 */
2153 pfx_adjust_for_slash = (pfx_length ? 1 : 0);
2154 while (a + pfx_length - pfx_adjust_for_slash <= old &&
2155 b + pfx_length - pfx_adjust_for_slash <= new &&
2156 *old == *new) {
2157 if (*old == '/')
2158 sfx_length = len_a - (old - a);
2159 old--;
2160 new--;
2161 }
2162
2163 /*
2164 * pfx{mid-a => mid-b}sfx
2165 * {pfx-a => pfx-b}sfx
2166 * pfx{sfx-a => sfx-b}
2167 * name-a => name-b
2168 */
2169 a_midlen = len_a - pfx_length - sfx_length;
2170 b_midlen = len_b - pfx_length - sfx_length;
2171 if (a_midlen < 0)
2172 a_midlen = 0;
2173 if (b_midlen < 0)
2174 b_midlen = 0;
2175
2176 strbuf_grow(&name, pfx_length + a_midlen + b_midlen + sfx_length + 7);
2177 if (pfx_length + sfx_length) {
2178 strbuf_add(&name, a, pfx_length);
2179 strbuf_addch(&name, '{');
2180 }
2181 strbuf_add(&name, a + pfx_length, a_midlen);
2182 strbuf_addstr(&name, " => ");
2183 strbuf_add(&name, b + pfx_length, b_midlen);
2184 if (pfx_length + sfx_length) {
2185 strbuf_addch(&name, '}');
2186 strbuf_add(&name, a + len_a - sfx_length, sfx_length);
2187 }
2188 return strbuf_detach(&name, NULL);
2189 }
2190
2191 struct diffstat_t {
2192 int nr;
2193 int alloc;
2194 struct diffstat_file {
2195 char *from_name;
2196 char *name;
2197 char *print_name;
2198 unsigned is_unmerged:1;
2199 unsigned is_binary:1;
2200 unsigned is_renamed:1;
2201 unsigned is_interesting:1;
2202 uintmax_t added, deleted;
2203 } **files;
2204 };
2205
2206 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
2207 const char *name_a,
2208 const char *name_b)
2209 {
2210 struct diffstat_file *x;
2211 x = xcalloc(1, sizeof(*x));
2212 ALLOC_GROW(diffstat->files, diffstat->nr + 1, diffstat->alloc);
2213 diffstat->files[diffstat->nr++] = x;
2214 if (name_b) {
2215 x->from_name = xstrdup(name_a);
2216 x->name = xstrdup(name_b);
2217 x->is_renamed = 1;
2218 }
2219 else {
2220 x->from_name = NULL;
2221 x->name = xstrdup(name_a);
2222 }
2223 return x;
2224 }
2225
2226 static void diffstat_consume(void *priv, char *line, unsigned long len)
2227 {
2228 struct diffstat_t *diffstat = priv;
2229 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
2230
2231 if (line[0] == '+')
2232 x->added++;
2233 else if (line[0] == '-')
2234 x->deleted++;
2235 }
2236
2237 const char mime_boundary_leader[] = "------------";
2238
2239 static int scale_linear(int it, int width, int max_change)
2240 {
2241 if (!it)
2242 return 0;
2243 /*
2244 * make sure that at least one '-' or '+' is printed if
2245 * there is any change to this path. The easiest way is to
2246 * scale linearly as if the alloted width is one column shorter
2247 * than it is, and then add 1 to the result.
2248 */
2249 return 1 + (it * (width - 1) / max_change);
2250 }
2251
2252 static void show_graph(struct strbuf *out, char ch, int cnt,
2253 const char *set, const char *reset)
2254 {
2255 if (cnt <= 0)
2256 return;
2257 strbuf_addstr(out, set);
2258 strbuf_addchars(out, ch, cnt);
2259 strbuf_addstr(out, reset);
2260 }
2261
2262 static void fill_print_name(struct diffstat_file *file)
2263 {
2264 char *pname;
2265
2266 if (file->print_name)
2267 return;
2268
2269 if (!file->is_renamed) {
2270 struct strbuf buf = STRBUF_INIT;
2271 if (quote_c_style(file->name, &buf, NULL, 0)) {
2272 pname = strbuf_detach(&buf, NULL);
2273 } else {
2274 pname = file->name;
2275 strbuf_release(&buf);
2276 }
2277 } else {
2278 pname = pprint_rename(file->from_name, file->name);
2279 }
2280 file->print_name = pname;
2281 }
2282
2283 static void print_stat_summary_inserts_deletes(struct diff_options *options,
2284 int files, int insertions, int deletions)
2285 {
2286 struct strbuf sb = STRBUF_INIT;
2287
2288 if (!files) {
2289 assert(insertions == 0 && deletions == 0);
2290 emit_diff_symbol(options, DIFF_SYMBOL_STATS_SUMMARY_NO_FILES,
2291 NULL, 0, 0);
2292 return;
2293 }
2294
2295 strbuf_addf(&sb,
2296 (files == 1) ? " %d file changed" : " %d files changed",
2297 files);
2298
2299 /*
2300 * For binary diff, the caller may want to print "x files
2301 * changed" with insertions == 0 && deletions == 0.
2302 *
2303 * Not omitting "0 insertions(+), 0 deletions(-)" in this case
2304 * is probably less confusing (i.e skip over "2 files changed
2305 * but nothing about added/removed lines? Is this a bug in Git?").
2306 */
2307 if (insertions || deletions == 0) {
2308 strbuf_addf(&sb,
2309 (insertions == 1) ? ", %d insertion(+)" : ", %d insertions(+)",
2310 insertions);
2311 }
2312
2313 if (deletions || insertions == 0) {
2314 strbuf_addf(&sb,
2315 (deletions == 1) ? ", %d deletion(-)" : ", %d deletions(-)",
2316 deletions);
2317 }
2318 strbuf_addch(&sb, '\n');
2319 emit_diff_symbol(options, DIFF_SYMBOL_STATS_SUMMARY_INSERTS_DELETES,
2320 sb.buf, sb.len, 0);
2321 strbuf_release(&sb);
2322 }
2323
2324 void print_stat_summary(FILE *fp, int files,
2325 int insertions, int deletions)
2326 {
2327 struct diff_options o;
2328 memset(&o, 0, sizeof(o));
2329 o.file = fp;
2330
2331 print_stat_summary_inserts_deletes(&o, files, insertions, deletions);
2332 }
2333
2334 static void show_stats(struct diffstat_t *data, struct diff_options *options)
2335 {
2336 int i, len, add, del, adds = 0, dels = 0;
2337 uintmax_t max_change = 0, max_len = 0;
2338 int total_files = data->nr, count;
2339 int width, name_width, graph_width, number_width = 0, bin_width = 0;
2340 const char *reset, *add_c, *del_c;
2341 int extra_shown = 0;
2342 const char *line_prefix = diff_line_prefix(options);
2343 struct strbuf out = STRBUF_INIT;
2344
2345 if (data->nr == 0)
2346 return;
2347
2348 count = options->stat_count ? options->stat_count : data->nr;
2349
2350 reset = diff_get_color_opt(options, DIFF_RESET);
2351 add_c = diff_get_color_opt(options, DIFF_FILE_NEW);
2352 del_c = diff_get_color_opt(options, DIFF_FILE_OLD);
2353
2354 /*
2355 * Find the longest filename and max number of changes
2356 */
2357 for (i = 0; (i < count) && (i < data->nr); i++) {
2358 struct diffstat_file *file = data->files[i];
2359 uintmax_t change = file->added + file->deleted;
2360
2361 if (!file->is_interesting && (change == 0)) {
2362 count++; /* not shown == room for one more */
2363 continue;
2364 }
2365 fill_print_name(file);
2366 len = strlen(file->print_name);
2367 if (max_len < len)
2368 max_len = len;
2369
2370 if (file->is_unmerged) {
2371 /* "Unmerged" is 8 characters */
2372 bin_width = bin_width < 8 ? 8 : bin_width;
2373 continue;
2374 }
2375 if (file->is_binary) {
2376 /* "Bin XXX -> YYY bytes" */
2377 int w = 14 + decimal_width(file->added)
2378 + decimal_width(file->deleted);
2379 bin_width = bin_width < w ? w : bin_width;
2380 /* Display change counts aligned with "Bin" */
2381 number_width = 3;
2382 continue;
2383 }
2384
2385 if (max_change < change)
2386 max_change = change;
2387 }
2388 count = i; /* where we can stop scanning in data->files[] */
2389
2390 /*
2391 * We have width = stat_width or term_columns() columns total.
2392 * We want a maximum of min(max_len, stat_name_width) for the name part.
2393 * We want a maximum of min(max_change, stat_graph_width) for the +- part.
2394 * We also need 1 for " " and 4 + decimal_width(max_change)
2395 * for " | NNNN " and one the empty column at the end, altogether
2396 * 6 + decimal_width(max_change).
2397 *
2398 * If there's not enough space, we will use the smaller of
2399 * stat_name_width (if set) and 5/8*width for the filename,
2400 * and the rest for constant elements + graph part, but no more
2401 * than stat_graph_width for the graph part.
2402 * (5/8 gives 50 for filename and 30 for the constant parts + graph
2403 * for the standard terminal size).
2404 *
2405 * In other words: stat_width limits the maximum width, and
2406 * stat_name_width fixes the maximum width of the filename,
2407 * and is also used to divide available columns if there
2408 * aren't enough.
2409 *
2410 * Binary files are displayed with "Bin XXX -> YYY bytes"
2411 * instead of the change count and graph. This part is treated
2412 * similarly to the graph part, except that it is not
2413 * "scaled". If total width is too small to accommodate the
2414 * guaranteed minimum width of the filename part and the
2415 * separators and this message, this message will "overflow"
2416 * making the line longer than the maximum width.
2417 */
2418
2419 if (options->stat_width == -1)
2420 width = term_columns() - strlen(line_prefix);
2421 else
2422 width = options->stat_width ? options->stat_width : 80;
2423 number_width = decimal_width(max_change) > number_width ?
2424 decimal_width(max_change) : number_width;
2425
2426 if (options->stat_graph_width == -1)
2427 options->stat_graph_width = diff_stat_graph_width;
2428
2429 /*
2430 * Guarantee 3/8*16==6 for the graph part
2431 * and 5/8*16==10 for the filename part
2432 */
2433 if (width < 16 + 6 + number_width)
2434 width = 16 + 6 + number_width;
2435
2436 /*
2437 * First assign sizes that are wanted, ignoring available width.
2438 * strlen("Bin XXX -> YYY bytes") == bin_width, and the part
2439 * starting from "XXX" should fit in graph_width.
2440 */
2441 graph_width = max_change + 4 > bin_width ? max_change : bin_width - 4;
2442 if (options->stat_graph_width &&
2443 options->stat_graph_width < graph_width)
2444 graph_width = options->stat_graph_width;
2445
2446 name_width = (options->stat_name_width > 0 &&
2447 options->stat_name_width < max_len) ?
2448 options->stat_name_width : max_len;
2449
2450 /*
2451 * Adjust adjustable widths not to exceed maximum width
2452 */
2453 if (name_width + number_width + 6 + graph_width > width) {
2454 if (graph_width > width * 3/8 - number_width - 6) {
2455 graph_width = width * 3/8 - number_width - 6;
2456 if (graph_width < 6)
2457 graph_width = 6;
2458 }
2459
2460 if (options->stat_graph_width &&
2461 graph_width > options->stat_graph_width)
2462 graph_width = options->stat_graph_width;
2463 if (name_width > width - number_width - 6 - graph_width)
2464 name_width = width - number_width - 6 - graph_width;
2465 else
2466 graph_width = width - number_width - 6 - name_width;
2467 }
2468
2469 /*
2470 * From here name_width is the width of the name area,
2471 * and graph_width is the width of the graph area.
2472 * max_change is used to scale graph properly.
2473 */
2474 for (i = 0; i < count; i++) {
2475 const char *prefix = "";
2476 struct diffstat_file *file = data->files[i];
2477 char *name = file->print_name;
2478 uintmax_t added = file->added;
2479 uintmax_t deleted = file->deleted;
2480 int name_len;
2481
2482 if (!file->is_interesting && (added + deleted == 0))
2483 continue;
2484
2485 /*
2486 * "scale" the filename
2487 */
2488 len = name_width;
2489 name_len = strlen(name);
2490 if (name_width < name_len) {
2491 char *slash;
2492 prefix = "...";
2493 len -= 3;
2494 name += name_len - len;
2495 slash = strchr(name, '/');
2496 if (slash)
2497 name = slash;
2498 }
2499
2500 if (file->is_binary) {
2501 strbuf_addf(&out, " %s%-*s |", prefix, len, name);
2502 strbuf_addf(&out, " %*s", number_width, "Bin");
2503 if (!added && !deleted) {
2504 strbuf_addch(&out, '\n');
2505 emit_diff_symbol(options, DIFF_SYMBOL_STATS_LINE,
2506 out.buf, out.len, 0);
2507 strbuf_reset(&out);
2508 continue;
2509 }
2510 strbuf_addf(&out, " %s%"PRIuMAX"%s",
2511 del_c, deleted, reset);
2512 strbuf_addstr(&out, " -> ");
2513 strbuf_addf(&out, "%s%"PRIuMAX"%s",
2514 add_c, added, reset);
2515 strbuf_addstr(&out, " bytes\n");
2516 emit_diff_symbol(options, DIFF_SYMBOL_STATS_LINE,
2517 out.buf, out.len, 0);
2518 strbuf_reset(&out);
2519 continue;
2520 }
2521 else if (file->is_unmerged) {
2522 strbuf_addf(&out, " %s%-*s |", prefix, len, name);
2523 strbuf_addstr(&out, " Unmerged\n");
2524 emit_diff_symbol(options, DIFF_SYMBOL_STATS_LINE,
2525 out.buf, out.len, 0);
2526 strbuf_reset(&out);
2527 continue;
2528 }
2529
2530 /*
2531 * scale the add/delete
2532 */
2533 add = added;
2534 del = deleted;
2535
2536 if (graph_width <= max_change) {
2537 int total = scale_linear(add + del, graph_width, max_change);
2538 if (total < 2 && add && del)
2539 /* width >= 2 due to the sanity check */
2540 total = 2;
2541 if (add < del) {
2542 add = scale_linear(add, graph_width, max_change);
2543 del = total - add;
2544 } else {
2545 del = scale_linear(del, graph_width, max_change);
2546 add = total - del;
2547 }
2548 }
2549 strbuf_addf(&out, " %s%-*s |", prefix, len, name);
2550 strbuf_addf(&out, " %*"PRIuMAX"%s",
2551 number_width, added + deleted,
2552 added + deleted ? " " : "");
2553 show_graph(&out, '+', add, add_c, reset);
2554 show_graph(&out, '-', del, del_c, reset);
2555 strbuf_addch(&out, '\n');
2556 emit_diff_symbol(options, DIFF_SYMBOL_STATS_LINE,
2557 out.buf, out.len, 0);
2558 strbuf_reset(&out);
2559 }
2560
2561 for (i = 0; i < data->nr; i++) {
2562 struct diffstat_file *file = data->files[i];
2563 uintmax_t added = file->added;
2564 uintmax_t deleted = file->deleted;
2565
2566 if (file->is_unmerged ||
2567 (!file->is_interesting && (added + deleted == 0))) {
2568 total_files--;
2569 continue;
2570 }
2571
2572 if (!file->is_binary) {
2573 adds += added;
2574 dels += deleted;
2575 }
2576 if (i < count)
2577 continue;
2578 if (!extra_shown)
2579 emit_diff_symbol(options,
2580 DIFF_SYMBOL_STATS_SUMMARY_ABBREV,
2581 NULL, 0, 0);
2582 extra_shown = 1;
2583 }
2584
2585 print_stat_summary_inserts_deletes(options, total_files, adds, dels);
2586 strbuf_release(&out);
2587 }
2588
2589 static void show_shortstats(struct diffstat_t *data, struct diff_options *options)
2590 {
2591 int i, adds = 0, dels = 0, total_files = data->nr;
2592
2593 if (data->nr == 0)
2594 return;
2595
2596 for (i = 0; i < data->nr; i++) {
2597 int added = data->files[i]->added;
2598 int deleted = data->files[i]->deleted;
2599
2600 if (data->files[i]->is_unmerged ||
2601 (!data->files[i]->is_interesting && (added + deleted == 0))) {
2602 total_files--;
2603 } else if (!data->files[i]->is_binary) { /* don't count bytes */
2604 adds += added;
2605 dels += deleted;
2606 }
2607 }
2608 print_stat_summary_inserts_deletes(options, total_files, adds, dels);
2609 }
2610
2611 static void show_numstat(struct diffstat_t *data, struct diff_options *options)
2612 {
2613 int i;
2614
2615 if (data->nr == 0)
2616 return;
2617
2618 for (i = 0; i < data->nr; i++) {
2619 struct diffstat_file *file = data->files[i];
2620
2621 fprintf(options->file, "%s", diff_line_prefix(options));
2622
2623 if (file->is_binary)
2624 fprintf(options->file, "-\t-\t");
2625 else
2626 fprintf(options->file,
2627 "%"PRIuMAX"\t%"PRIuMAX"\t",
2628 file->added, file->deleted);
2629 if (options->line_termination) {
2630 fill_print_name(file);
2631 if (!file->is_renamed)
2632 write_name_quoted(file->name, options->file,
2633 options->line_termination);
2634 else {
2635 fputs(file->print_name, options->file);
2636 putc(options->line_termination, options->file);
2637 }
2638 } else {
2639 if (file->is_renamed) {
2640 putc('\0', options->file);
2641 write_name_quoted(file->from_name, options->file, '\0');
2642 }
2643 write_name_quoted(file->name, options->file, '\0');
2644 }
2645 }
2646 }
2647
2648 struct dirstat_file {
2649 const char *name;
2650 unsigned long changed;
2651 };
2652
2653 struct dirstat_dir {
2654 struct dirstat_file *files;
2655 int alloc, nr, permille, cumulative;
2656 };
2657
2658 static long gather_dirstat(struct diff_options *opt, struct dirstat_dir *dir,
2659 unsigned long changed, const char *base, int baselen)
2660 {
2661 unsigned long this_dir = 0;
2662 unsigned int sources = 0;
2663 const char *line_prefix = diff_line_prefix(opt);
2664
2665 while (dir->nr) {
2666 struct dirstat_file *f = dir->files;
2667 int namelen = strlen(f->name);
2668 unsigned long this;
2669 char *slash;
2670
2671 if (namelen < baselen)
2672 break;
2673 if (memcmp(f->name, base, baselen))
2674 break;
2675 slash = strchr(f->name + baselen, '/');
2676 if (slash) {
2677 int newbaselen = slash + 1 - f->name;
2678 this = gather_dirstat(opt, dir, changed, f->name, newbaselen);
2679 sources++;
2680 } else {
2681 this = f->changed;
2682 dir->files++;
2683 dir->nr--;
2684 sources += 2;
2685 }
2686 this_dir += this;
2687 }
2688
2689 /*
2690 * We don't report dirstat's for
2691 * - the top level
2692 * - or cases where everything came from a single directory
2693 * under this directory (sources == 1).
2694 */
2695 if (baselen && sources != 1) {
2696 if (this_dir) {
2697 int permille = this_dir * 1000 / changed;
2698 if (permille >= dir->permille) {
2699 fprintf(opt->file, "%s%4d.%01d%% %.*s\n", line_prefix,
2700 permille / 10, permille % 10, baselen, base);
2701 if (!dir->cumulative)
2702 return 0;
2703 }
2704 }
2705 }
2706 return this_dir;
2707 }
2708
2709 static int dirstat_compare(const void *_a, const void *_b)
2710 {
2711 const struct dirstat_file *a = _a;
2712 const struct dirstat_file *b = _b;
2713 return strcmp(a->name, b->name);
2714 }
2715
2716 static void show_dirstat(struct diff_options *options)
2717 {
2718 int i;
2719 unsigned long changed;
2720 struct dirstat_dir dir;
2721 struct diff_queue_struct *q = &diff_queued_diff;
2722
2723 dir.files = NULL;
2724 dir.alloc = 0;
2725 dir.nr = 0;
2726 dir.permille = options->dirstat_permille;
2727 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
2728
2729 changed = 0;
2730 for (i = 0; i < q->nr; i++) {
2731 struct diff_filepair *p = q->queue[i];
2732 const char *name;
2733 unsigned long copied, added, damage;
2734 int content_changed;
2735
2736 name = p->two->path ? p->two->path : p->one->path;
2737
2738 if (p->one->oid_valid && p->two->oid_valid)
2739 content_changed = oidcmp(&p->one->oid, &p->two->oid);
2740 else
2741 content_changed = 1;
2742
2743 if (!content_changed) {
2744 /*
2745 * The SHA1 has not changed, so pre-/post-content is
2746 * identical. We can therefore skip looking at the
2747 * file contents altogether.
2748 */
2749 damage = 0;
2750 goto found_damage;
2751 }
2752
2753 if (DIFF_OPT_TST(options, DIRSTAT_BY_FILE)) {
2754 /*
2755 * In --dirstat-by-file mode, we don't really need to
2756 * look at the actual file contents at all.
2757 * The fact that the SHA1 changed is enough for us to
2758 * add this file to the list of results
2759 * (with each file contributing equal damage).
2760 */
2761 damage = 1;
2762 goto found_damage;
2763 }
2764
2765 if (DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) {
2766 diff_populate_filespec(p->one, 0);
2767 diff_populate_filespec(p->two, 0);
2768 diffcore_count_changes(p->one, p->two, NULL, NULL,
2769 &copied, &added);
2770 diff_free_filespec_data(p->one);
2771 diff_free_filespec_data(p->two);
2772 } else if (DIFF_FILE_VALID(p->one)) {
2773 diff_populate_filespec(p->one, CHECK_SIZE_ONLY);
2774 copied = added = 0;
2775 diff_free_filespec_data(p->one);
2776 } else if (DIFF_FILE_VALID(p->two)) {
2777 diff_populate_filespec(p->two, CHECK_SIZE_ONLY);
2778 copied = 0;
2779 added = p->two->size;
2780 diff_free_filespec_data(p->two);
2781 } else
2782 continue;
2783
2784 /*
2785 * Original minus copied is the removed material,
2786 * added is the new material. They are both damages
2787 * made to the preimage.
2788 * If the resulting damage is zero, we know that
2789 * diffcore_count_changes() considers the two entries to
2790 * be identical, but since content_changed is true, we
2791 * know that there must have been _some_ kind of change,
2792 * so we force all entries to have damage > 0.
2793 */
2794 damage = (p->one->size - copied) + added;
2795 if (!damage)
2796 damage = 1;
2797
2798 found_damage:
2799 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
2800 dir.files[dir.nr].name = name;
2801 dir.files[dir.nr].changed = damage;
2802 changed += damage;
2803 dir.nr++;
2804 }
2805
2806 /* This can happen even with many files, if everything was renames */
2807 if (!changed)
2808 return;
2809
2810 /* Show all directories with more than x% of the changes */
2811 QSORT(dir.files, dir.nr, dirstat_compare);
2812 gather_dirstat(options, &dir, changed, "", 0);
2813 }
2814
2815 static void show_dirstat_by_line(struct diffstat_t *data, struct diff_options *options)
2816 {
2817 int i;
2818 unsigned long changed;
2819 struct dirstat_dir dir;
2820
2821 if (data->nr == 0)
2822 return;
2823
2824 dir.files = NULL;
2825 dir.alloc = 0;
2826 dir.nr = 0;
2827 dir.permille = options->dirstat_permille;
2828 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
2829
2830 changed = 0;
2831 for (i = 0; i < data->nr; i++) {
2832 struct diffstat_file *file = data->files[i];
2833 unsigned long damage = file->added + file->deleted;
2834 if (file->is_binary)
2835 /*
2836 * binary files counts bytes, not lines. Must find some
2837 * way to normalize binary bytes vs. textual lines.
2838 * The following heuristic assumes that there are 64
2839 * bytes per "line".
2840 * This is stupid and ugly, but very cheap...
2841 */
2842 damage = DIV_ROUND_UP(damage, 64);
2843 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
2844 dir.files[dir.nr].name = file->name;
2845 dir.files[dir.nr].changed = damage;
2846 changed += damage;
2847 dir.nr++;
2848 }
2849
2850 /* This can happen even with many files, if everything was renames */
2851 if (!changed)
2852 return;
2853
2854 /* Show all directories with more than x% of the changes */
2855 QSORT(dir.files, dir.nr, dirstat_compare);
2856 gather_dirstat(options, &dir, changed, "", 0);
2857 }
2858
2859 static void free_diffstat_info(struct diffstat_t *diffstat)
2860 {
2861 int i;
2862 for (i = 0; i < diffstat->nr; i++) {
2863 struct diffstat_file *f = diffstat->files[i];
2864 if (f->name != f->print_name)
2865 free(f->print_name);
2866 free(f->name);
2867 free(f->from_name);
2868 free(f);
2869 }
2870 free(diffstat->files);
2871 }
2872
2873 struct checkdiff_t {
2874 const char *filename;
2875 int lineno;
2876 int conflict_marker_size;
2877 struct diff_options *o;
2878 unsigned ws_rule;
2879 unsigned status;
2880 };
2881
2882 static int is_conflict_marker(const char *line, int marker_size, unsigned long len)
2883 {
2884 char firstchar;
2885 int cnt;
2886
2887 if (len < marker_size + 1)
2888 return 0;
2889 firstchar = line[0];
2890 switch (firstchar) {
2891 case '=': case '>': case '<': case '|':
2892 break;
2893 default:
2894 return 0;
2895 }
2896 for (cnt = 1; cnt < marker_size; cnt++)
2897 if (line[cnt] != firstchar)
2898 return 0;
2899 /* line[1] thru line[marker_size-1] are same as firstchar */
2900 if (len < marker_size + 1 || !isspace(line[marker_size]))
2901 return 0;
2902 return 1;
2903 }
2904
2905 static void checkdiff_consume(void *priv, char *line, unsigned long len)
2906 {
2907 struct checkdiff_t *data = priv;
2908 int marker_size = data->conflict_marker_size;
2909 const char *ws = diff_get_color(data->o->use_color, DIFF_WHITESPACE);
2910 const char *reset = diff_get_color(data->o->use_color, DIFF_RESET);
2911 const char *set = diff_get_color(data->o->use_color, DIFF_FILE_NEW);
2912 char *err;
2913 const char *line_prefix;
2914
2915 assert(data->o);
2916 line_prefix = diff_line_prefix(data->o);
2917
2918 if (line[0] == '+') {
2919 unsigned bad;
2920 data->lineno++;
2921 if (is_conflict_marker(line + 1, marker_size, len - 1)) {
2922 data->status |= 1;
2923 fprintf(data->o->file,
2924 "%s%s:%d: leftover conflict marker\n",
2925 line_prefix, data->filename, data->lineno);
2926 }
2927 bad = ws_check(line + 1, len - 1, data->ws_rule);
2928 if (!bad)
2929 return;
2930 data->status |= bad;
2931 err = whitespace_error_string(bad);
2932 fprintf(data->o->file, "%s%s:%d: %s.\n",
2933 line_prefix, data->filename, data->lineno, err);
2934 free(err);
2935 emit_line(data->o, set, reset, line, 1);
2936 ws_check_emit(line + 1, len - 1, data->ws_rule,
2937 data->o->file, set, reset, ws);
2938 } else if (line[0] == ' ') {
2939 data->lineno++;
2940 } else if (line[0] == '@') {
2941 char *plus = strchr(line, '+');
2942 if (plus)
2943 data->lineno = strtol(plus, NULL, 10) - 1;
2944 else
2945 die("invalid diff");
2946 }
2947 }
2948
2949 static unsigned char *deflate_it(char *data,
2950 unsigned long size,
2951 unsigned long *result_size)
2952 {
2953 int bound;
2954 unsigned char *deflated;
2955 git_zstream stream;
2956
2957 git_deflate_init(&stream, zlib_compression_level);
2958 bound = git_deflate_bound(&stream, size);
2959 deflated = xmalloc(bound);
2960 stream.next_out = deflated;
2961 stream.avail_out = bound;
2962
2963 stream.next_in = (unsigned char *)data;
2964 stream.avail_in = size;
2965 while (git_deflate(&stream, Z_FINISH) == Z_OK)
2966 ; /* nothing */
2967 git_deflate_end(&stream);
2968 *result_size = stream.total_out;
2969 return deflated;
2970 }
2971
2972 static void emit_binary_diff_body(struct diff_options *o,
2973 mmfile_t *one, mmfile_t *two)
2974 {
2975 void *cp;
2976 void *delta;
2977 void *deflated;
2978 void *data;
2979 unsigned long orig_size;
2980 unsigned long delta_size;
2981 unsigned long deflate_size;
2982 unsigned long data_size;
2983
2984 /* We could do deflated delta, or we could do just deflated two,
2985 * whichever is smaller.
2986 */
2987 delta = NULL;
2988 deflated = deflate_it(two->ptr, two->size, &deflate_size);
2989 if (one->size && two->size) {
2990 delta = diff_delta(one->ptr, one->size,
2991 two->ptr, two->size,
2992 &delta_size, deflate_size);
2993 if (delta) {
2994 void *to_free = delta;
2995 orig_size = delta_size;
2996 delta = deflate_it(delta, delta_size, &delta_size);
2997 free(to_free);
2998 }
2999 }
3000
3001 if (delta && delta_size < deflate_size) {
3002 char *s = xstrfmt("%lu", orig_size);
3003 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_HEADER_DELTA,
3004 s, strlen(s), 0);
3005 free(s);
3006 free(deflated);
3007 data = delta;
3008 data_size = delta_size;
3009 } else {
3010 char *s = xstrfmt("%lu", two->size);
3011 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_HEADER_LITERAL,
3012 s, strlen(s), 0);
3013 free(s);
3014 free(delta);
3015 data = deflated;
3016 data_size = deflate_size;
3017 }
3018
3019 /* emit data encoded in base85 */
3020 cp = data;
3021 while (data_size) {
3022 int len;
3023 int bytes = (52 < data_size) ? 52 : data_size;
3024 char line[71];
3025 data_size -= bytes;
3026 if (bytes <= 26)
3027 line[0] = bytes + 'A' - 1;
3028 else
3029 line[0] = bytes - 26 + 'a' - 1;
3030 encode_85(line + 1, cp, bytes);
3031 cp = (char *) cp + bytes;
3032
3033 len = strlen(line);
3034 line[len++] = '\n';
3035 line[len] = '\0';
3036
3037 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_BODY,
3038 line, len, 0);
3039 }
3040 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_FOOTER, NULL, 0, 0);
3041 free(data);
3042 }
3043
3044 static void emit_binary_diff(struct diff_options *o,
3045 mmfile_t *one, mmfile_t *two)
3046 {
3047 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_HEADER, NULL, 0, 0);
3048 emit_binary_diff_body(o, one, two);
3049 emit_binary_diff_body(o, two, one);
3050 }
3051
3052 int diff_filespec_is_binary(struct diff_filespec *one)
3053 {
3054 if (one->is_binary == -1) {
3055 diff_filespec_load_driver(one);
3056 if (one->driver->binary != -1)
3057 one->is_binary = one->driver->binary;
3058 else {
3059 if (!one->data && DIFF_FILE_VALID(one))
3060 diff_populate_filespec(one, CHECK_BINARY);
3061 if (one->is_binary == -1 && one->data)
3062 one->is_binary = buffer_is_binary(one->data,
3063 one->size);
3064 if (one->is_binary == -1)
3065 one->is_binary = 0;
3066 }
3067 }
3068 return one->is_binary;
3069 }
3070
3071 static const struct userdiff_funcname *diff_funcname_pattern(struct diff_filespec *one)
3072 {
3073 diff_filespec_load_driver(one);
3074 return one->driver->funcname.pattern ? &one->driver->funcname : NULL;
3075 }
3076
3077 void diff_set_mnemonic_prefix(struct diff_options *options, const char *a, const char *b)
3078 {
3079 if (!options->a_prefix)
3080 options->a_prefix = a;
3081 if (!options->b_prefix)
3082 options->b_prefix = b;
3083 }
3084
3085 struct userdiff_driver *get_textconv(struct diff_filespec *one)
3086 {
3087 if (!DIFF_FILE_VALID(one))
3088 return NULL;
3089
3090 diff_filespec_load_driver(one);
3091 return userdiff_get_textconv(one->driver);
3092 }
3093
3094 static void builtin_diff(const char *name_a,
3095 const char *name_b,
3096 struct diff_filespec *one,
3097 struct diff_filespec *two,
3098 const char *xfrm_msg,
3099 int must_show_header,
3100 struct diff_options *o,
3101 int complete_rewrite)
3102 {
3103 mmfile_t mf1, mf2;
3104 const char *lbl[2];
3105 char *a_one, *b_two;
3106 const char *meta = diff_get_color_opt(o, DIFF_METAINFO);
3107 const char *reset = diff_get_color_opt(o, DIFF_RESET);
3108 const char *a_prefix, *b_prefix;
3109 struct userdiff_driver *textconv_one = NULL;
3110 struct userdiff_driver *textconv_two = NULL;
3111 struct strbuf header = STRBUF_INIT;
3112 const char *line_prefix = diff_line_prefix(o);
3113
3114 diff_set_mnemonic_prefix(o, "a/", "b/");
3115 if (DIFF_OPT_TST(o, REVERSE_DIFF)) {
3116 a_prefix = o->b_prefix;
3117 b_prefix = o->a_prefix;
3118 } else {
3119 a_prefix = o->a_prefix;
3120 b_prefix = o->b_prefix;
3121 }
3122
3123 if (o->submodule_format == DIFF_SUBMODULE_LOG &&
3124 (!one->mode || S_ISGITLINK(one->mode)) &&
3125 (!two->mode || S_ISGITLINK(two->mode))) {
3126 show_submodule_summary(o, one->path ? one->path : two->path,
3127 &one->oid, &two->oid,
3128 two->dirty_submodule);
3129 return;
3130 } else if (o->submodule_format == DIFF_SUBMODULE_INLINE_DIFF &&
3131 (!one->mode || S_ISGITLINK(one->mode)) &&
3132 (!two->mode || S_ISGITLINK(two->mode))) {
3133 show_submodule_inline_diff(o, one->path ? one->path : two->path,
3134 &one->oid, &two->oid,
3135 two->dirty_submodule);
3136 return;
3137 }
3138
3139 if (DIFF_OPT_TST(o, ALLOW_TEXTCONV)) {
3140 textconv_one = get_textconv(one);
3141 textconv_two = get_textconv(two);
3142 }
3143
3144 /* Never use a non-valid filename anywhere if at all possible */
3145 name_a = DIFF_FILE_VALID(one) ? name_a : name_b;
3146 name_b = DIFF_FILE_VALID(two) ? name_b : name_a;
3147
3148 a_one = quote_two(a_prefix, name_a + (*name_a == '/'));
3149 b_two = quote_two(b_prefix, name_b + (*name_b == '/'));
3150 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
3151 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
3152 strbuf_addf(&header, "%s%sdiff --git %s %s%s\n", line_prefix, meta, a_one, b_two, reset);
3153 if (lbl[0][0] == '/') {
3154 /* /dev/null */
3155 strbuf_addf(&header, "%s%snew file mode %06o%s\n", line_prefix, meta, two->mode, reset);
3156 if (xfrm_msg)
3157 strbuf_addstr(&header, xfrm_msg);
3158 must_show_header = 1;
3159 }
3160 else if (lbl[1][0] == '/') {
3161 strbuf_addf(&header, "%s%sdeleted file mode %06o%s\n", line_prefix, meta, one->mode, reset);
3162 if (xfrm_msg)
3163 strbuf_addstr(&header, xfrm_msg);
3164 must_show_header = 1;
3165 }
3166 else {
3167 if (one->mode != two->mode) {
3168 strbuf_addf(&header, "%s%sold mode %06o%s\n", line_prefix, meta, one->mode, reset);
3169 strbuf_addf(&header, "%s%snew mode %06o%s\n", line_prefix, meta, two->mode, reset);
3170 must_show_header = 1;
3171 }
3172 if (xfrm_msg)
3173 strbuf_addstr(&header, xfrm_msg);
3174
3175 /*
3176 * we do not run diff between different kind
3177 * of objects.
3178 */
3179 if ((one->mode ^ two->mode) & S_IFMT)
3180 goto free_ab_and_return;
3181 if (complete_rewrite &&
3182 (textconv_one || !diff_filespec_is_binary(one)) &&
3183 (textconv_two || !diff_filespec_is_binary(two))) {
3184 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
3185 header.buf, header.len, 0);
3186 strbuf_reset(&header);
3187 emit_rewrite_diff(name_a, name_b, one, two,
3188 textconv_one, textconv_two, o);
3189 o->found_changes = 1;
3190 goto free_ab_and_return;
3191 }
3192 }
3193
3194 if (o->irreversible_delete && lbl[1][0] == '/') {
3195 emit_diff_symbol(o, DIFF_SYMBOL_HEADER, header.buf,
3196 header.len, 0);
3197 strbuf_reset(&header);
3198 goto free_ab_and_return;
3199 } else if (!DIFF_OPT_TST(o, TEXT) &&
3200 ( (!textconv_one && diff_filespec_is_binary(one)) ||
3201 (!textconv_two && diff_filespec_is_binary(two)) )) {
3202 struct strbuf sb = STRBUF_INIT;
3203 if (!one->data && !two->data &&
3204 S_ISREG(one->mode) && S_ISREG(two->mode) &&
3205 !DIFF_OPT_TST(o, BINARY)) {
3206 if (!oidcmp(&one->oid, &two->oid)) {
3207 if (must_show_header)
3208 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
3209 header.buf, header.len,
3210 0);
3211 goto free_ab_and_return;
3212 }
3213 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
3214 header.buf, header.len, 0);
3215 strbuf_addf(&sb, "%sBinary files %s and %s differ\n",
3216 diff_line_prefix(o), lbl[0], lbl[1]);
3217 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_FILES,
3218 sb.buf, sb.len, 0);
3219 strbuf_release(&sb);
3220 goto free_ab_and_return;
3221 }
3222 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
3223 die("unable to read files to diff");
3224 /* Quite common confusing case */
3225 if (mf1.size == mf2.size &&
3226 !memcmp(mf1.ptr, mf2.ptr, mf1.size)) {
3227 if (must_show_header)
3228 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
3229 header.buf, header.len, 0);
3230 goto free_ab_and_return;
3231 }
3232 emit_diff_symbol(o, DIFF_SYMBOL_HEADER, header.buf, header.len, 0);
3233 strbuf_reset(&header);
3234 if (DIFF_OPT_TST(o, BINARY))
3235 emit_binary_diff(o, &mf1, &mf2);
3236 else {
3237 strbuf_addf(&sb, "%sBinary files %s and %s differ\n",
3238 diff_line_prefix(o), lbl[0], lbl[1]);
3239 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_FILES,
3240 sb.buf, sb.len, 0);
3241 strbuf_release(&sb);
3242 }
3243 o->found_changes = 1;
3244 } else {
3245 /* Crazy xdl interfaces.. */
3246 const char *diffopts = getenv("GIT_DIFF_OPTS");
3247 const char *v;
3248 xpparam_t xpp;
3249 xdemitconf_t xecfg;
3250 struct emit_callback ecbdata;
3251 const struct userdiff_funcname *pe;
3252
3253 if (must_show_header) {
3254 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
3255 header.buf, header.len, 0);
3256 strbuf_reset(&header);
3257 }
3258
3259 mf1.size = fill_textconv(textconv_one, one, &mf1.ptr);
3260 mf2.size = fill_textconv(textconv_two, two, &mf2.ptr);
3261
3262 pe = diff_funcname_pattern(one);
3263 if (!pe)
3264 pe = diff_funcname_pattern(two);
3265
3266 memset(&xpp, 0, sizeof(xpp));
3267 memset(&xecfg, 0, sizeof(xecfg));
3268 memset(&ecbdata, 0, sizeof(ecbdata));
3269 ecbdata.label_path = lbl;
3270 ecbdata.color_diff = want_color(o->use_color);
3271 ecbdata.ws_rule = whitespace_rule(name_b);
3272 if (ecbdata.ws_rule & WS_BLANK_AT_EOF)
3273 check_blank_at_eof(&mf1, &mf2, &ecbdata);
3274 ecbdata.opt = o;
3275 ecbdata.header = header.len ? &header : NULL;
3276 xpp.flags = o->xdl_opts;
3277 xecfg.ctxlen = o->context;
3278 xecfg.interhunkctxlen = o->interhunkcontext;
3279 xecfg.flags = XDL_EMIT_FUNCNAMES;
3280 if (DIFF_OPT_TST(o, FUNCCONTEXT))
3281 xecfg.flags |= XDL_EMIT_FUNCCONTEXT;
3282 if (pe)
3283 xdiff_set_find_func(&xecfg, pe->pattern, pe->cflags);
3284 if (!diffopts)
3285 ;
3286 else if (skip_prefix(diffopts, "--unified=", &v))
3287 xecfg.ctxlen = strtoul(v, NULL, 10);
3288 else if (skip_prefix(diffopts, "-u", &v))
3289 xecfg.ctxlen = strtoul(v, NULL, 10);
3290 if (o->word_diff)
3291 init_diff_words_data(&ecbdata, o, one, two);
3292 if (xdi_diff_outf(&mf1, &mf2, fn_out_consume, &ecbdata,
3293 &xpp, &xecfg))
3294 die("unable to generate diff for %s", one->path);
3295 if (o->word_diff)
3296 free_diff_words_data(&ecbdata);
3297 if (textconv_one)
3298 free(mf1.ptr);
3299 if (textconv_two)
3300 free(mf2.ptr);
3301 xdiff_clear_find_func(&xecfg);
3302 }
3303
3304 free_ab_and_return:
3305 strbuf_release(&header);
3306 diff_free_filespec_data(one);
3307 diff_free_filespec_data(two);
3308 free(a_one);
3309 free(b_two);
3310 return;
3311 }
3312
3313 static void builtin_diffstat(const char *name_a, const char *name_b,
3314 struct diff_filespec *one,
3315 struct diff_filespec *two,
3316 struct diffstat_t *diffstat,
3317 struct diff_options *o,
3318 struct diff_filepair *p)
3319 {
3320 mmfile_t mf1, mf2;
3321 struct diffstat_file *data;
3322 int same_contents;
3323 int complete_rewrite = 0;
3324
3325 if (!DIFF_PAIR_UNMERGED(p)) {
3326 if (p->status == DIFF_STATUS_MODIFIED && p->score)
3327 complete_rewrite = 1;
3328 }
3329
3330 data = diffstat_add(diffstat, name_a, name_b);
3331 data->is_interesting = p->status != DIFF_STATUS_UNKNOWN;
3332
3333 if (!one || !two) {
3334 data->is_unmerged = 1;
3335 return;
3336 }
3337
3338 same_contents = !oidcmp(&one->oid, &two->oid);
3339
3340 if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
3341 data->is_binary = 1;
3342 if (same_contents) {
3343 data->added = 0;
3344 data->deleted = 0;
3345 } else {
3346 data->added = diff_filespec_size(two);
3347 data->deleted = diff_filespec_size(one);
3348 }
3349 }
3350
3351 else if (complete_rewrite) {
3352 diff_populate_filespec(one, 0);
3353 diff_populate_filespec(two, 0);
3354 data->deleted = count_lines(one->data, one->size);
3355 data->added = count_lines(two->data, two->size);
3356 }
3357
3358 else if (!same_contents) {
3359 /* Crazy xdl interfaces.. */
3360 xpparam_t xpp;
3361 xdemitconf_t xecfg;
3362
3363 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
3364 die("unable to read files to diff");
3365
3366 memset(&xpp, 0, sizeof(xpp));
3367 memset(&xecfg, 0, sizeof(xecfg));
3368 xpp.flags = o->xdl_opts;
3369 xecfg.ctxlen = o->context;
3370 xecfg.interhunkctxlen = o->interhunkcontext;
3371 if (xdi_diff_outf(&mf1, &mf2, diffstat_consume, diffstat,
3372 &xpp, &xecfg))
3373 die("unable to generate diffstat for %s", one->path);
3374 }
3375
3376 diff_free_filespec_data(one);
3377 diff_free_filespec_data(two);
3378 }
3379
3380 static void builtin_checkdiff(const char *name_a, const char *name_b,
3381 const char *attr_path,
3382 struct diff_filespec *one,
3383 struct diff_filespec *two,
3384 struct diff_options *o)
3385 {
3386 mmfile_t mf1, mf2;
3387 struct checkdiff_t data;
3388
3389 if (!two)
3390 return;
3391
3392 memset(&data, 0, sizeof(data));
3393 data.filename = name_b ? name_b : name_a;
3394 data.lineno = 0;
3395 data.o = o;
3396 data.ws_rule = whitespace_rule(attr_path);
3397 data.conflict_marker_size = ll_merge_marker_size(attr_path);
3398
3399 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
3400 die("unable to read files to diff");
3401
3402 /*
3403 * All the other codepaths check both sides, but not checking
3404 * the "old" side here is deliberate. We are checking the newly
3405 * introduced changes, and as long as the "new" side is text, we
3406 * can and should check what it introduces.
3407 */
3408 if (diff_filespec_is_binary(two))
3409 goto free_and_return;
3410 else {
3411 /* Crazy xdl interfaces.. */
3412 xpparam_t xpp;
3413 xdemitconf_t xecfg;
3414
3415 memset(&xpp, 0, sizeof(xpp));
3416 memset(&xecfg, 0, sizeof(xecfg));
3417 xecfg.ctxlen = 1; /* at least one context line */
3418 xpp.flags = 0;
3419 if (xdi_diff_outf(&mf1, &mf2, checkdiff_consume, &data,
3420 &xpp, &xecfg))
3421 die("unable to generate checkdiff for %s", one->path);
3422
3423 if (data.ws_rule & WS_BLANK_AT_EOF) {
3424 struct emit_callback ecbdata;
3425 int blank_at_eof;
3426
3427 ecbdata.ws_rule = data.ws_rule;
3428 check_blank_at_eof(&mf1, &mf2, &ecbdata);
3429 blank_at_eof = ecbdata.blank_at_eof_in_postimage;
3430
3431 if (blank_at_eof) {
3432 static char *err;
3433 if (!err)
3434 err = whitespace_error_string(WS_BLANK_AT_EOF);
3435 fprintf(o->file, "%s:%d: %s.\n",
3436 data.filename, blank_at_eof, err);
3437 data.status = 1; /* report errors */
3438 }
3439 }
3440 }
3441 free_and_return:
3442 diff_free_filespec_data(one);
3443 diff_free_filespec_data(two);
3444 if (data.status)
3445 DIFF_OPT_SET(o, CHECK_FAILED);
3446 }
3447
3448 struct diff_filespec *alloc_filespec(const char *path)
3449 {
3450 struct diff_filespec *spec;
3451
3452 FLEXPTR_ALLOC_STR(spec, path, path);
3453 spec->count = 1;
3454 spec->is_binary = -1;
3455 return spec;
3456 }
3457
3458 void free_filespec(struct diff_filespec *spec)
3459 {
3460 if (!--spec->count) {
3461 diff_free_filespec_data(spec);
3462 free(spec);
3463 }
3464 }
3465
3466 void fill_filespec(struct diff_filespec *spec, const struct object_id *oid,
3467 int oid_valid, unsigned short mode)
3468 {
3469 if (mode) {
3470 spec->mode = canon_mode(mode);
3471 oidcpy(&spec->oid, oid);
3472 spec->oid_valid = oid_valid;
3473 }
3474 }
3475
3476 /*
3477 * Given a name and sha1 pair, if the index tells us the file in
3478 * the work tree has that object contents, return true, so that
3479 * prepare_temp_file() does not have to inflate and extract.
3480 */
3481 static int reuse_worktree_file(const char *name, const struct object_id *oid, int want_file)
3482 {
3483 const struct cache_entry *ce;
3484 struct stat st;
3485 int pos, len;
3486
3487 /*
3488 * We do not read the cache ourselves here, because the
3489 * benchmark with my previous version that always reads cache
3490 * shows that it makes things worse for diff-tree comparing
3491 * two linux-2.6 kernel trees in an already checked out work
3492 * tree. This is because most diff-tree comparisons deal with
3493 * only a small number of files, while reading the cache is
3494 * expensive for a large project, and its cost outweighs the
3495 * savings we get by not inflating the object to a temporary
3496 * file. Practically, this code only helps when we are used
3497 * by diff-cache --cached, which does read the cache before
3498 * calling us.
3499 */
3500 if (!active_cache)
3501 return 0;
3502
3503 /* We want to avoid the working directory if our caller
3504 * doesn't need the data in a normal file, this system
3505 * is rather slow with its stat/open/mmap/close syscalls,
3506 * and the object is contained in a pack file. The pack
3507 * is probably already open and will be faster to obtain
3508 * the data through than the working directory. Loose
3509 * objects however would tend to be slower as they need
3510 * to be individually opened and inflated.
3511 */
3512 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(oid->hash))
3513 return 0;
3514
3515 /*
3516 * Similarly, if we'd have to convert the file contents anyway, that
3517 * makes the optimization not worthwhile.
3518 */
3519 if (!want_file && would_convert_to_git(&the_index, name))
3520 return 0;
3521
3522 len = strlen(name);
3523 pos = cache_name_pos(name, len);
3524 if (pos < 0)
3525 return 0;
3526 ce = active_cache[pos];
3527
3528 /*
3529 * This is not the sha1 we are looking for, or
3530 * unreusable because it is not a regular file.
3531 */
3532 if (oidcmp(oid, &ce->oid) || !S_ISREG(ce->ce_mode))
3533 return 0;
3534
3535 /*
3536 * If ce is marked as "assume unchanged", there is no
3537 * guarantee that work tree matches what we are looking for.
3538 */
3539 if ((ce->ce_flags & CE_VALID) || ce_skip_worktree(ce))
3540 return 0;
3541
3542 /*
3543 * If ce matches the file in the work tree, we can reuse it.
3544 */
3545 if (ce_uptodate(ce) ||
3546 (!lstat(name, &st) && !ce_match_stat(ce, &st, 0)))
3547 return 1;
3548
3549 return 0;
3550 }
3551
3552 static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
3553 {
3554 struct strbuf buf = STRBUF_INIT;
3555 char *dirty = "";
3556
3557 /* Are we looking at the work tree? */
3558 if (s->dirty_submodule)
3559 dirty = "-dirty";
3560
3561 strbuf_addf(&buf, "Subproject commit %s%s\n",
3562 oid_to_hex(&s->oid), dirty);
3563 s->size = buf.len;
3564 if (size_only) {
3565 s->data = NULL;
3566 strbuf_release(&buf);
3567 } else {
3568 s->data = strbuf_detach(&buf, NULL);
3569 s->should_free = 1;
3570 }
3571 return 0;
3572 }
3573
3574 /*
3575 * While doing rename detection and pickaxe operation, we may need to
3576 * grab the data for the blob (or file) for our own in-core comparison.
3577 * diff_filespec has data and size fields for this purpose.
3578 */
3579 int diff_populate_filespec(struct diff_filespec *s, unsigned int flags)
3580 {
3581 int size_only = flags & CHECK_SIZE_ONLY;
3582 int err = 0;
3583 /*
3584 * demote FAIL to WARN to allow inspecting the situation
3585 * instead of refusing.
3586 */
3587 enum safe_crlf crlf_warn = (safe_crlf == SAFE_CRLF_FAIL
3588 ? SAFE_CRLF_WARN
3589 : safe_crlf);
3590
3591 if (!DIFF_FILE_VALID(s))
3592 die("internal error: asking to populate invalid file.");
3593 if (S_ISDIR(s->mode))
3594 return -1;
3595
3596 if (s->data)
3597 return 0;
3598
3599 if (size_only && 0 < s->size)
3600 return 0;
3601
3602 if (S_ISGITLINK(s->mode))
3603 return diff_populate_gitlink(s, size_only);
3604
3605 if (!s->oid_valid ||
3606 reuse_worktree_file(s->path, &s->oid, 0)) {
3607 struct strbuf buf = STRBUF_INIT;
3608 struct stat st;
3609 int fd;
3610
3611 if (lstat(s->path, &st) < 0) {
3612 if (errno == ENOENT) {
3613 err_empty:
3614 err = -1;
3615 empty:
3616 s->data = (char *)"";
3617 s->size = 0;
3618 return err;
3619 }
3620 }
3621 s->size = xsize_t(st.st_size);
3622 if (!s->size)
3623 goto empty;
3624 if (S_ISLNK(st.st_mode)) {
3625 struct strbuf sb = STRBUF_INIT;
3626
3627 if (strbuf_readlink(&sb, s->path, s->size))
3628 goto err_empty;
3629 s->size = sb.len;
3630 s->data = strbuf_detach(&sb, NULL);
3631 s->should_free = 1;
3632 return 0;
3633 }
3634
3635 /*
3636 * Even if the caller would be happy with getting
3637 * only the size, we cannot return early at this
3638 * point if the path requires us to run the content
3639 * conversion.
3640 */
3641 if (size_only && !would_convert_to_git(&the_index, s->path))
3642 return 0;
3643
3644 /*
3645 * Note: this check uses xsize_t(st.st_size) that may
3646 * not be the true size of the blob after it goes
3647 * through convert_to_git(). This may not strictly be
3648 * correct, but the whole point of big_file_threshold
3649 * and is_binary check being that we want to avoid
3650 * opening the file and inspecting the contents, this
3651 * is probably fine.
3652 */
3653 if ((flags & CHECK_BINARY) &&
3654 s->size > big_file_threshold && s->is_binary == -1) {
3655 s->is_binary = 1;
3656 return 0;
3657 }
3658 fd = open(s->path, O_RDONLY);
3659 if (fd < 0)
3660 goto err_empty;
3661 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
3662 close(fd);
3663 s->should_munmap = 1;
3664
3665 /*
3666 * Convert from working tree format to canonical git format
3667 */
3668 if (convert_to_git(&the_index, s->path, s->data, s->size, &buf, crlf_warn)) {
3669 size_t size = 0;
3670 munmap(s->data, s->size);
3671 s->should_munmap = 0;
3672 s->data = strbuf_detach(&buf, &size);
3673 s->size = size;
3674 s->should_free = 1;
3675 }
3676 }
3677 else {
3678 enum object_type type;
3679 if (size_only || (flags & CHECK_BINARY)) {
3680 type = sha1_object_info(s->oid.hash, &s->size);
3681 if (type < 0)
3682 die("unable to read %s",
3683 oid_to_hex(&s->oid));
3684 if (size_only)
3685 return 0;
3686 if (s->size > big_file_threshold && s->is_binary == -1) {
3687 s->is_binary = 1;
3688 return 0;
3689 }
3690 }
3691 s->data = read_sha1_file(s->oid.hash, &type, &s->size);
3692 if (!s->data)
3693 die("unable to read %s", oid_to_hex(&s->oid));
3694 s->should_free = 1;
3695 }
3696 return 0;
3697 }
3698
3699 void diff_free_filespec_blob(struct diff_filespec *s)
3700 {
3701 if (s->should_free)
3702 free(s->data);
3703 else if (s->should_munmap)
3704 munmap(s->data, s->size);
3705
3706 if (s->should_free || s->should_munmap) {
3707 s->should_free = s->should_munmap = 0;
3708 s->data = NULL;
3709 }
3710 }
3711
3712 void diff_free_filespec_data(struct diff_filespec *s)
3713 {
3714 diff_free_filespec_blob(s);
3715 FREE_AND_NULL(s->cnt_data);
3716 }
3717
3718 static void prep_temp_blob(const char *path, struct diff_tempfile *temp,
3719 void *blob,
3720 unsigned long size,
3721 const struct object_id *oid,
3722 int mode)
3723 {
3724 struct strbuf buf = STRBUF_INIT;
3725 struct strbuf template = STRBUF_INIT;
3726 char *path_dup = xstrdup(path);
3727 const char *base = basename(path_dup);
3728
3729 /* Generate "XXXXXX_basename.ext" */
3730 strbuf_addstr(&template, "XXXXXX_");
3731 strbuf_addstr(&template, base);
3732
3733 temp->tempfile = mks_tempfile_ts(template.buf, strlen(base) + 1);
3734 if (!temp->tempfile)
3735 die_errno("unable to create temp-file");
3736 if (convert_to_working_tree(path,
3737 (const char *)blob, (size_t)size, &buf)) {
3738 blob = buf.buf;
3739 size = buf.len;
3740 }
3741 if (write_in_full(temp->tempfile->fd, blob, size) < 0 ||
3742 close_tempfile_gently(temp->tempfile))
3743 die_errno("unable to write temp-file");
3744 temp->name = get_tempfile_path(temp->tempfile);
3745 oid_to_hex_r(temp->hex, oid);
3746 xsnprintf(temp->mode, sizeof(temp->mode), "%06o", mode);
3747 strbuf_release(&buf);
3748 strbuf_release(&template);
3749 free(path_dup);
3750 }
3751
3752 static struct diff_tempfile *prepare_temp_file(const char *name,
3753 struct diff_filespec *one)
3754 {
3755 struct diff_tempfile *temp = claim_diff_tempfile();
3756
3757 if (!DIFF_FILE_VALID(one)) {
3758 not_a_valid_file:
3759 /* A '-' entry produces this for file-2, and
3760 * a '+' entry produces this for file-1.
3761 */
3762 temp->name = "/dev/null";
3763 xsnprintf(temp->hex, sizeof(temp->hex), ".");
3764 xsnprintf(temp->mode, sizeof(temp->mode), ".");
3765 return temp;
3766 }
3767
3768 if (!S_ISGITLINK(one->mode) &&
3769 (!one->oid_valid ||
3770 reuse_worktree_file(name, &one->oid, 1))) {
3771 struct stat st;
3772 if (lstat(name, &st) < 0) {
3773 if (errno == ENOENT)
3774 goto not_a_valid_file;
3775 die_errno("stat(%s)", name);
3776 }
3777 if (S_ISLNK(st.st_mode)) {
3778 struct strbuf sb = STRBUF_INIT;
3779 if (strbuf_readlink(&sb, name, st.st_size) < 0)
3780 die_errno("readlink(%s)", name);
3781 prep_temp_blob(name, temp, sb.buf, sb.len,
3782 (one->oid_valid ?
3783 &one->oid : &null_oid),
3784 (one->oid_valid ?
3785 one->mode : S_IFLNK));
3786 strbuf_release(&sb);
3787 }
3788 else {
3789 /* we can borrow from the file in the work tree */
3790 temp->name = name;
3791 if (!one->oid_valid)
3792 oid_to_hex_r(temp->hex, &null_oid);
3793 else
3794 oid_to_hex_r(temp->hex, &one->oid);
3795 /* Even though we may sometimes borrow the
3796 * contents from the work tree, we always want
3797 * one->mode. mode is trustworthy even when
3798 * !(one->oid_valid), as long as
3799 * DIFF_FILE_VALID(one).
3800 */
3801 xsnprintf(temp->mode, sizeof(temp->mode), "%06o", one->mode);
3802 }
3803 return temp;
3804 }
3805 else {
3806 if (diff_populate_filespec(one, 0))
3807 die("cannot read data blob for %s", one->path);
3808 prep_temp_blob(name, temp, one->data, one->size,
3809 &one->oid, one->mode);
3810 }
3811 return temp;
3812 }
3813
3814 static void add_external_diff_name(struct argv_array *argv,
3815 const char *name,
3816 struct diff_filespec *df)
3817 {
3818 struct diff_tempfile *temp = prepare_temp_file(name, df);
3819 argv_array_push(argv, temp->name);
3820 argv_array_push(argv, temp->hex);
3821 argv_array_push(argv, temp->mode);
3822 }
3823
3824 /* An external diff command takes:
3825 *
3826 * diff-cmd name infile1 infile1-sha1 infile1-mode \
3827 * infile2 infile2-sha1 infile2-mode [ rename-to ]
3828 *
3829 */
3830 static void run_external_diff(const char *pgm,
3831 const char *name,
3832 const char *other,
3833 struct diff_filespec *one,
3834 struct diff_filespec *two,
3835 const char *xfrm_msg,
3836 int complete_rewrite,
3837 struct diff_options *o)
3838 {
3839 struct argv_array argv = ARGV_ARRAY_INIT;
3840 struct argv_array env = ARGV_ARRAY_INIT;
3841 struct diff_queue_struct *q = &diff_queued_diff;
3842
3843 argv_array_push(&argv, pgm);
3844 argv_array_push(&argv, name);
3845
3846 if (one && two) {
3847 add_external_diff_name(&argv, name, one);
3848 if (!other)
3849 add_external_diff_name(&argv, name, two);
3850 else {
3851 add_external_diff_name(&argv, other, two);
3852 argv_array_push(&argv, other);
3853 argv_array_push(&argv, xfrm_msg);
3854 }
3855 }
3856
3857 argv_array_pushf(&env, "GIT_DIFF_PATH_COUNTER=%d", ++o->diff_path_counter);
3858 argv_array_pushf(&env, "GIT_DIFF_PATH_TOTAL=%d", q->nr);
3859
3860 if (run_command_v_opt_cd_env(argv.argv, RUN_USING_SHELL, NULL, env.argv))
3861 die(_("external diff died, stopping at %s"), name);
3862
3863 remove_tempfile();
3864 argv_array_clear(&argv);
3865 argv_array_clear(&env);
3866 }
3867
3868 static int similarity_index(struct diff_filepair *p)
3869 {
3870 return p->score * 100 / MAX_SCORE;
3871 }
3872
3873 static const char *diff_abbrev_oid(const struct object_id *oid, int abbrev)
3874 {
3875 if (startup_info->have_repository)
3876 return find_unique_abbrev(oid->hash, abbrev);
3877 else {
3878 char *hex = oid_to_hex(oid);
3879 if (abbrev < 0)
3880 abbrev = FALLBACK_DEFAULT_ABBREV;
3881 if (abbrev > GIT_SHA1_HEXSZ)
3882 die("BUG: oid abbreviation out of range: %d", abbrev);
3883 if (abbrev)
3884 hex[abbrev] = '\0';
3885 return hex;
3886 }
3887 }
3888
3889 static void fill_metainfo(struct strbuf *msg,
3890 const char *name,
3891 const char *other,
3892 struct diff_filespec *one,
3893 struct diff_filespec *two,
3894 struct diff_options *o,
3895 struct diff_filepair *p,
3896 int *must_show_header,
3897 int use_color)
3898 {
3899 const char *set = diff_get_color(use_color, DIFF_METAINFO);
3900 const char *reset = diff_get_color(use_color, DIFF_RESET);
3901 const char *line_prefix = diff_line_prefix(o);
3902
3903 *must_show_header = 1;
3904 strbuf_init(msg, PATH_MAX * 2 + 300);
3905 switch (p->status) {
3906 case DIFF_STATUS_COPIED:
3907 strbuf_addf(msg, "%s%ssimilarity index %d%%",
3908 line_prefix, set, similarity_index(p));
3909 strbuf_addf(msg, "%s\n%s%scopy from ",
3910 reset, line_prefix, set);
3911 quote_c_style(name, msg, NULL, 0);
3912 strbuf_addf(msg, "%s\n%s%scopy to ", reset, line_prefix, set);
3913 quote_c_style(other, msg, NULL, 0);
3914 strbuf_addf(msg, "%s\n", reset);
3915 break;
3916 case DIFF_STATUS_RENAMED:
3917 strbuf_addf(msg, "%s%ssimilarity index %d%%",
3918 line_prefix, set, similarity_index(p));
3919 strbuf_addf(msg, "%s\n%s%srename from ",
3920 reset, line_prefix, set);
3921 quote_c_style(name, msg, NULL, 0);
3922 strbuf_addf(msg, "%s\n%s%srename to ",
3923 reset, line_prefix, set);
3924 quote_c_style(other, msg, NULL, 0);
3925 strbuf_addf(msg, "%s\n", reset);
3926 break;
3927 case DIFF_STATUS_MODIFIED:
3928 if (p->score) {
3929 strbuf_addf(msg, "%s%sdissimilarity index %d%%%s\n",
3930 line_prefix,
3931 set, similarity_index(p), reset);
3932 break;
3933 }
3934 /* fallthru */
3935 default:
3936 *must_show_header = 0;
3937 }
3938 if (one && two && oidcmp(&one->oid, &two->oid)) {
3939 int abbrev = DIFF_OPT_TST(o, FULL_INDEX) ? 40 : DEFAULT_ABBREV;
3940
3941 if (DIFF_OPT_TST(o, BINARY)) {
3942 mmfile_t mf;
3943 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
3944 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
3945 abbrev = 40;
3946 }
3947 strbuf_addf(msg, "%s%sindex %s..%s", line_prefix, set,
3948 diff_abbrev_oid(&one->oid, abbrev),
3949 diff_abbrev_oid(&two->oid, abbrev));
3950 if (one->mode == two->mode)
3951 strbuf_addf(msg, " %06o", one->mode);
3952 strbuf_addf(msg, "%s\n", reset);
3953 }
3954 }
3955
3956 static void run_diff_cmd(const char *pgm,
3957 const char *name,
3958 const char *other,
3959 const char *attr_path,
3960 struct diff_filespec *one,
3961 struct diff_filespec *two,
3962 struct strbuf *msg,
3963 struct diff_options *o,
3964 struct diff_filepair *p)
3965 {
3966 const char *xfrm_msg = NULL;
3967 int complete_rewrite = (p->status == DIFF_STATUS_MODIFIED) && p->score;
3968 int must_show_header = 0;
3969
3970
3971 if (DIFF_OPT_TST(o, ALLOW_EXTERNAL)) {
3972 struct userdiff_driver *drv = userdiff_find_by_path(attr_path);
3973 if (drv && drv->external)
3974 pgm = drv->external;
3975 }
3976
3977 if (msg) {
3978 /*
3979 * don't use colors when the header is intended for an
3980 * external diff driver
3981 */
3982 fill_metainfo(msg, name, other, one, two, o, p,
3983 &must_show_header,
3984 want_color(o->use_color) && !pgm);
3985 xfrm_msg = msg->len ? msg->buf : NULL;
3986 }
3987
3988 if (pgm) {
3989 run_external_diff(pgm, name, other, one, two, xfrm_msg,
3990 complete_rewrite, o);
3991 return;
3992 }
3993 if (one && two)
3994 builtin_diff(name, other ? other : name,
3995 one, two, xfrm_msg, must_show_header,
3996 o, complete_rewrite);
3997 else
3998 fprintf(o->file, "* Unmerged path %s\n", name);
3999 }
4000
4001 static void diff_fill_oid_info(struct diff_filespec *one)
4002 {
4003 if (DIFF_FILE_VALID(one)) {
4004 if (!one->oid_valid) {
4005 struct stat st;
4006 if (one->is_stdin) {
4007 oidclr(&one->oid);
4008 return;
4009 }
4010 if (lstat(one->path, &st) < 0)
4011 die_errno("stat '%s'", one->path);
4012 if (index_path(&one->oid, one->path, &st, 0))
4013 die("cannot hash %s", one->path);
4014 }
4015 }
4016 else
4017 oidclr(&one->oid);
4018 }
4019
4020 static void strip_prefix(int prefix_length, const char **namep, const char **otherp)
4021 {
4022 /* Strip the prefix but do not molest /dev/null and absolute paths */
4023 if (*namep && **namep != '/') {
4024 *namep += prefix_length;
4025 if (**namep == '/')
4026 ++*namep;
4027 }
4028 if (*otherp && **otherp != '/') {
4029 *otherp += prefix_length;
4030 if (**otherp == '/')
4031 ++*otherp;
4032 }
4033 }
4034
4035 static void run_diff(struct diff_filepair *p, struct diff_options *o)
4036 {
4037 const char *pgm = external_diff();
4038 struct strbuf msg;
4039 struct diff_filespec *one = p->one;
4040 struct diff_filespec *two = p->two;
4041 const char *name;
4042 const char *other;
4043 const char *attr_path;
4044
4045 name = one->path;
4046 other = (strcmp(name, two->path) ? two->path : NULL);
4047 attr_path = name;
4048 if (o->prefix_length)
4049 strip_prefix(o->prefix_length, &name, &other);
4050
4051 if (!DIFF_OPT_TST(o, ALLOW_EXTERNAL))
4052 pgm = NULL;
4053
4054 if (DIFF_PAIR_UNMERGED(p)) {
4055 run_diff_cmd(pgm, name, NULL, attr_path,
4056 NULL, NULL, NULL, o, p);
4057 return;
4058 }
4059
4060 diff_fill_oid_info(one);
4061 diff_fill_oid_info(two);
4062
4063 if (!pgm &&
4064 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
4065 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
4066 /*
4067 * a filepair that changes between file and symlink
4068 * needs to be split into deletion and creation.
4069 */
4070 struct diff_filespec *null = alloc_filespec(two->path);
4071 run_diff_cmd(NULL, name, other, attr_path,
4072 one, null, &msg, o, p);
4073 free(null);
4074 strbuf_release(&msg);
4075
4076 null = alloc_filespec(one->path);
4077 run_diff_cmd(NULL, name, other, attr_path,
4078 null, two, &msg, o, p);
4079 free(null);
4080 }
4081 else
4082 run_diff_cmd(pgm, name, other, attr_path,
4083 one, two, &msg, o, p);
4084
4085 strbuf_release(&msg);
4086 }
4087
4088 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
4089 struct diffstat_t *diffstat)
4090 {
4091 const char *name;
4092 const char *other;
4093
4094 if (DIFF_PAIR_UNMERGED(p)) {
4095 /* unmerged */
4096 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, p);
4097 return;
4098 }
4099
4100 name = p->one->path;
4101 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
4102
4103 if (o->prefix_length)
4104 strip_prefix(o->prefix_length, &name, &other);
4105
4106 diff_fill_oid_info(p->one);
4107 diff_fill_oid_info(p->two);
4108
4109 builtin_diffstat(name, other, p->one, p->two, diffstat, o, p);
4110 }
4111
4112 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
4113 {
4114 const char *name;
4115 const char *other;
4116 const char *attr_path;
4117
4118 if (DIFF_PAIR_UNMERGED(p)) {
4119 /* unmerged */
4120 return;
4121 }
4122
4123 name = p->one->path;
4124 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
4125 attr_path = other ? other : name;
4126
4127 if (o->prefix_length)
4128 strip_prefix(o->prefix_length, &name, &other);
4129
4130 diff_fill_oid_info(p->one);
4131 diff_fill_oid_info(p->two);
4132
4133 builtin_checkdiff(name, other, attr_path, p->one, p->two, o);
4134 }
4135
4136 void diff_setup(struct diff_options *options)
4137 {
4138 memcpy(options, &default_diff_options, sizeof(*options));
4139
4140 options->file = stdout;
4141
4142 options->abbrev = DEFAULT_ABBREV;
4143 options->line_termination = '\n';
4144 options->break_opt = -1;
4145 options->rename_limit = -1;
4146 options->dirstat_permille = diff_dirstat_permille_default;
4147 options->context = diff_context_default;
4148 options->interhunkcontext = diff_interhunk_context_default;
4149 options->ws_error_highlight = ws_error_highlight_default;
4150 DIFF_OPT_SET(options, RENAME_EMPTY);
4151
4152 /* pathchange left =NULL by default */
4153 options->change = diff_change;
4154 options->add_remove = diff_addremove;
4155 options->use_color = diff_use_color_default;
4156 options->detect_rename = diff_detect_rename_default;
4157 options->xdl_opts |= diff_algorithm;
4158 if (diff_indent_heuristic)
4159 DIFF_XDL_SET(options, INDENT_HEURISTIC);
4160
4161 options->orderfile = diff_order_file_cfg;
4162
4163 if (diff_no_prefix) {
4164 options->a_prefix = options->b_prefix = "";
4165 } else if (!diff_mnemonic_prefix) {
4166 options->a_prefix = "a/";
4167 options->b_prefix = "b/";
4168 }
4169
4170 options->color_moved = diff_color_moved_default;
4171 }
4172
4173 void diff_setup_done(struct diff_options *options)
4174 {
4175 int count = 0;
4176
4177 if (options->set_default)
4178 options->set_default(options);
4179
4180 if (options->output_format & DIFF_FORMAT_NAME)
4181 count++;
4182 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
4183 count++;
4184 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
4185 count++;
4186 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
4187 count++;
4188 if (count > 1)
4189 die(_("--name-only, --name-status, --check and -s are mutually exclusive"));
4190
4191 /*
4192 * Most of the time we can say "there are changes"
4193 * only by checking if there are changed paths, but
4194 * --ignore-whitespace* options force us to look
4195 * inside contents.
4196 */
4197
4198 if (DIFF_XDL_TST(options, IGNORE_WHITESPACE) ||
4199 DIFF_XDL_TST(options, IGNORE_WHITESPACE_CHANGE) ||
4200 DIFF_XDL_TST(options, IGNORE_WHITESPACE_AT_EOL))
4201 DIFF_OPT_SET(options, DIFF_FROM_CONTENTS);
4202 else
4203 DIFF_OPT_CLR(options, DIFF_FROM_CONTENTS);
4204
4205 if (DIFF_OPT_TST(options, FIND_COPIES_HARDER))
4206 options->detect_rename = DIFF_DETECT_COPY;
4207
4208 if (!DIFF_OPT_TST(options, RELATIVE_NAME))
4209 options->prefix = NULL;
4210 if (options->prefix)
4211 options->prefix_length = strlen(options->prefix);
4212 else
4213 options->prefix_length = 0;
4214
4215 if (options->output_format & (DIFF_FORMAT_NAME |
4216 DIFF_FORMAT_NAME_STATUS |
4217 DIFF_FORMAT_CHECKDIFF |
4218 DIFF_FORMAT_NO_OUTPUT))
4219 options->output_format &= ~(DIFF_FORMAT_RAW |
4220 DIFF_FORMAT_NUMSTAT |
4221 DIFF_FORMAT_DIFFSTAT |
4222 DIFF_FORMAT_SHORTSTAT |
4223 DIFF_FORMAT_DIRSTAT |
4224 DIFF_FORMAT_SUMMARY |
4225 DIFF_FORMAT_PATCH);
4226
4227 /*
4228 * These cases always need recursive; we do not drop caller-supplied
4229 * recursive bits for other formats here.
4230 */
4231 if (options->output_format & (DIFF_FORMAT_PATCH |
4232 DIFF_FORMAT_NUMSTAT |
4233 DIFF_FORMAT_DIFFSTAT |
4234 DIFF_FORMAT_SHORTSTAT |
4235 DIFF_FORMAT_DIRSTAT |
4236 DIFF_FORMAT_SUMMARY |
4237 DIFF_FORMAT_CHECKDIFF))
4238 DIFF_OPT_SET(options, RECURSIVE);
4239 /*
4240 * Also pickaxe would not work very well if you do not say recursive
4241 */
4242 if (options->pickaxe)
4243 DIFF_OPT_SET(options, RECURSIVE);
4244 /*
4245 * When patches are generated, submodules diffed against the work tree
4246 * must be checked for dirtiness too so it can be shown in the output
4247 */
4248 if (options->output_format & DIFF_FORMAT_PATCH)
4249 DIFF_OPT_SET(options, DIRTY_SUBMODULES);
4250
4251 if (options->detect_rename && options->rename_limit < 0)
4252 options->rename_limit = diff_rename_limit_default;
4253 if (options->setup & DIFF_SETUP_USE_CACHE) {
4254 if (!active_cache)
4255 /* read-cache does not die even when it fails
4256 * so it is safe for us to do this here. Also
4257 * it does not smudge active_cache or active_nr
4258 * when it fails, so we do not have to worry about
4259 * cleaning it up ourselves either.
4260 */
4261 read_cache();
4262 }
4263 if (40 < options->abbrev)
4264 options->abbrev = 40; /* full */
4265
4266 /*
4267 * It does not make sense to show the first hit we happened
4268 * to have found. It does not make sense not to return with
4269 * exit code in such a case either.
4270 */
4271 if (DIFF_OPT_TST(options, QUICK)) {
4272 options->output_format = DIFF_FORMAT_NO_OUTPUT;
4273 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
4274 }
4275
4276 options->diff_path_counter = 0;
4277
4278 if (DIFF_OPT_TST(options, FOLLOW_RENAMES) && options->pathspec.nr != 1)
4279 die(_("--follow requires exactly one pathspec"));
4280
4281 if (!options->use_color || external_diff())
4282 options->color_moved = 0;
4283 }
4284
4285 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
4286 {
4287 char c, *eq;
4288 int len;
4289
4290 if (*arg != '-')
4291 return 0;
4292 c = *++arg;
4293 if (!c)
4294 return 0;
4295 if (c == arg_short) {
4296 c = *++arg;
4297 if (!c)
4298 return 1;
4299 if (val && isdigit(c)) {
4300 char *end;
4301 int n = strtoul(arg, &end, 10);
4302 if (*end)
4303 return 0;
4304 *val = n;
4305 return 1;
4306 }
4307 return 0;
4308 }
4309 if (c != '-')
4310 return 0;
4311 arg++;
4312 eq = strchrnul(arg, '=');
4313 len = eq - arg;
4314 if (!len || strncmp(arg, arg_long, len))
4315 return 0;
4316 if (*eq) {
4317 int n;
4318 char *end;
4319 if (!isdigit(*++eq))
4320 return 0;
4321 n = strtoul(eq, &end, 10);
4322 if (*end)
4323 return 0;
4324 *val = n;
4325 }
4326 return 1;
4327 }
4328
4329 static int diff_scoreopt_parse(const char *opt);
4330
4331 static inline int short_opt(char opt, const char **argv,
4332 const char **optarg)
4333 {
4334 const char *arg = argv[0];
4335 if (arg[0] != '-' || arg[1] != opt)
4336 return 0;
4337 if (arg[2] != '\0') {
4338 *optarg = arg + 2;
4339 return 1;
4340 }
4341 if (!argv[1])
4342 die("Option '%c' requires a value", opt);
4343 *optarg = argv[1];
4344 return 2;
4345 }
4346
4347 int parse_long_opt(const char *opt, const char **argv,
4348 const char **optarg)
4349 {
4350 const char *arg = argv[0];
4351 if (!skip_prefix(arg, "--", &arg))
4352 return 0;
4353 if (!skip_prefix(arg, opt, &arg))
4354 return 0;
4355 if (*arg == '=') { /* stuck form: --option=value */
4356 *optarg = arg + 1;
4357 return 1;
4358 }
4359 if (*arg != '\0')
4360 return 0;
4361 /* separate form: --option value */
4362 if (!argv[1])
4363 die("Option '--%s' requires a value", opt);
4364 *optarg = argv[1];
4365 return 2;
4366 }
4367
4368 static int stat_opt(struct diff_options *options, const char **av)
4369 {
4370 const char *arg = av[0];
4371 char *end;
4372 int width = options->stat_width;
4373 int name_width = options->stat_name_width;
4374 int graph_width = options->stat_graph_width;
4375 int count = options->stat_count;
4376 int argcount = 1;
4377
4378 if (!skip_prefix(arg, "--stat", &arg))
4379 die("BUG: stat option does not begin with --stat: %s", arg);
4380 end = (char *)arg;
4381
4382 switch (*arg) {
4383 case '-':
4384 if (skip_prefix(arg, "-width", &arg)) {
4385 if (*arg == '=')
4386 width = strtoul(arg + 1, &end, 10);
4387 else if (!*arg && !av[1])
4388 die_want_option("--stat-width");
4389 else if (!*arg) {
4390 width = strtoul(av[1], &end, 10);
4391 argcount = 2;
4392 }
4393 } else if (skip_prefix(arg, "-name-width", &arg)) {
4394 if (*arg == '=')
4395 name_width = strtoul(arg + 1, &end, 10);
4396 else if (!*arg && !av[1])
4397 die_want_option("--stat-name-width");
4398 else if (!*arg) {
4399 name_width = strtoul(av[1], &end, 10);
4400 argcount = 2;
4401 }
4402 } else if (skip_prefix(arg, "-graph-width", &arg)) {
4403 if (*arg == '=')
4404 graph_width = strtoul(arg + 1, &end, 10);
4405 else if (!*arg && !av[1])
4406 die_want_option("--stat-graph-width");
4407 else if (!*arg) {
4408 graph_width = strtoul(av[1], &end, 10);
4409 argcount = 2;
4410 }
4411 } else if (skip_prefix(arg, "-count", &arg)) {
4412 if (*arg == '=')
4413 count = strtoul(arg + 1, &end, 10);
4414 else if (!*arg && !av[1])
4415 die_want_option("--stat-count");
4416 else if (!*arg) {
4417 count = strtoul(av[1], &end, 10);
4418 argcount = 2;
4419 }
4420 }
4421 break;
4422 case '=':
4423 width = strtoul(arg+1, &end, 10);
4424 if (*end == ',')
4425 name_width = strtoul(end+1, &end, 10);
4426 if (*end == ',')
4427 count = strtoul(end+1, &end, 10);
4428 }
4429
4430 /* Important! This checks all the error cases! */
4431 if (*end)
4432 return 0;
4433 options->output_format |= DIFF_FORMAT_DIFFSTAT;
4434 options->stat_name_width = name_width;
4435 options->stat_graph_width = graph_width;
4436 options->stat_width = width;
4437 options->stat_count = count;
4438 return argcount;
4439 }
4440
4441 static int parse_dirstat_opt(struct diff_options *options, const char *params)
4442 {
4443 struct strbuf errmsg = STRBUF_INIT;
4444 if (parse_dirstat_params(options, params, &errmsg))
4445 die(_("Failed to parse --dirstat/-X option parameter:\n%s"),
4446 errmsg.buf);
4447 strbuf_release(&errmsg);
4448 /*
4449 * The caller knows a dirstat-related option is given from the command
4450 * line; allow it to say "return this_function();"
4451 */
4452 options->output_format |= DIFF_FORMAT_DIRSTAT;
4453 return 1;
4454 }
4455
4456 static int parse_submodule_opt(struct diff_options *options, const char *value)
4457 {
4458 if (parse_submodule_params(options, value))
4459 die(_("Failed to parse --submodule option parameter: '%s'"),
4460 value);
4461 return 1;
4462 }
4463
4464 static const char diff_status_letters[] = {
4465 DIFF_STATUS_ADDED,
4466 DIFF_STATUS_COPIED,
4467 DIFF_STATUS_DELETED,
4468 DIFF_STATUS_MODIFIED,
4469 DIFF_STATUS_RENAMED,
4470 DIFF_STATUS_TYPE_CHANGED,
4471 DIFF_STATUS_UNKNOWN,
4472 DIFF_STATUS_UNMERGED,
4473 DIFF_STATUS_FILTER_AON,
4474 DIFF_STATUS_FILTER_BROKEN,
4475 '\0',
4476 };
4477
4478 static unsigned int filter_bit['Z' + 1];
4479
4480 static void prepare_filter_bits(void)
4481 {
4482 int i;
4483
4484 if (!filter_bit[DIFF_STATUS_ADDED]) {
4485 for (i = 0; diff_status_letters[i]; i++)
4486 filter_bit[(int) diff_status_letters[i]] = (1 << i);
4487 }
4488 }
4489
4490 static unsigned filter_bit_tst(char status, const struct diff_options *opt)
4491 {
4492 return opt->filter & filter_bit[(int) status];
4493 }
4494
4495 static int parse_diff_filter_opt(const char *optarg, struct diff_options *opt)
4496 {
4497 int i, optch;
4498
4499 prepare_filter_bits();
4500
4501 /*
4502 * If there is a negation e.g. 'd' in the input, and we haven't
4503 * initialized the filter field with another --diff-filter, start
4504 * from full set of bits, except for AON.
4505 */
4506 if (!opt->filter) {
4507 for (i = 0; (optch = optarg[i]) != '\0'; i++) {
4508 if (optch < 'a' || 'z' < optch)
4509 continue;
4510 opt->filter = (1 << (ARRAY_SIZE(diff_status_letters) - 1)) - 1;
4511 opt->filter &= ~filter_bit[DIFF_STATUS_FILTER_AON];
4512 break;
4513 }
4514 }
4515
4516 for (i = 0; (optch = optarg[i]) != '\0'; i++) {
4517 unsigned int bit;
4518 int negate;
4519
4520 if ('a' <= optch && optch <= 'z') {
4521 negate = 1;
4522 optch = toupper(optch);
4523 } else {
4524 negate = 0;
4525 }
4526
4527 bit = (0 <= optch && optch <= 'Z') ? filter_bit[optch] : 0;
4528 if (!bit)
4529 return optarg[i];
4530 if (negate)
4531 opt->filter &= ~bit;
4532 else
4533 opt->filter |= bit;
4534 }
4535 return 0;
4536 }
4537
4538 static void enable_patch_output(int *fmt) {
4539 *fmt &= ~DIFF_FORMAT_NO_OUTPUT;
4540 *fmt |= DIFF_FORMAT_PATCH;
4541 }
4542
4543 static int parse_ws_error_highlight_opt(struct diff_options *opt, const char *arg)
4544 {
4545 int val = parse_ws_error_highlight(arg);
4546
4547 if (val < 0) {
4548 error("unknown value after ws-error-highlight=%.*s",
4549 -1 - val, arg);
4550 return 0;
4551 }
4552 opt->ws_error_highlight = val;
4553 return 1;
4554 }
4555
4556 int diff_opt_parse(struct diff_options *options,
4557 const char **av, int ac, const char *prefix)
4558 {
4559 const char *arg = av[0];
4560 const char *optarg;
4561 int argcount;
4562
4563 if (!prefix)
4564 prefix = "";
4565
4566 /* Output format options */
4567 if (!strcmp(arg, "-p") || !strcmp(arg, "-u") || !strcmp(arg, "--patch")
4568 || opt_arg(arg, 'U', "unified", &options->context))
4569 enable_patch_output(&options->output_format);
4570 else if (!strcmp(arg, "--raw"))
4571 options->output_format |= DIFF_FORMAT_RAW;
4572 else if (!strcmp(arg, "--patch-with-raw")) {
4573 enable_patch_output(&options->output_format);
4574 options->output_format |= DIFF_FORMAT_RAW;
4575 } else if (!strcmp(arg, "--numstat"))
4576 options->output_format |= DIFF_FORMAT_NUMSTAT;
4577 else if (!strcmp(arg, "--shortstat"))
4578 options->output_format |= DIFF_FORMAT_SHORTSTAT;
4579 else if (!strcmp(arg, "-X") || !strcmp(arg, "--dirstat"))
4580 return parse_dirstat_opt(options, "");
4581 else if (skip_prefix(arg, "-X", &arg))
4582 return parse_dirstat_opt(options, arg);
4583 else if (skip_prefix(arg, "--dirstat=", &arg))
4584 return parse_dirstat_opt(options, arg);
4585 else if (!strcmp(arg, "--cumulative"))
4586 return parse_dirstat_opt(options, "cumulative");
4587 else if (!strcmp(arg, "--dirstat-by-file"))
4588 return parse_dirstat_opt(options, "files");
4589 else if (skip_prefix(arg, "--dirstat-by-file=", &arg)) {
4590 parse_dirstat_opt(options, "files");
4591 return parse_dirstat_opt(options, arg);
4592 }
4593 else if (!strcmp(arg, "--check"))
4594 options->output_format |= DIFF_FORMAT_CHECKDIFF;
4595 else if (!strcmp(arg, "--summary"))
4596 options->output_format |= DIFF_FORMAT_SUMMARY;
4597 else if (!strcmp(arg, "--patch-with-stat")) {
4598 enable_patch_output(&options->output_format);
4599 options->output_format |= DIFF_FORMAT_DIFFSTAT;
4600 } else if (!strcmp(arg, "--name-only"))
4601 options->output_format |= DIFF_FORMAT_NAME;
4602 else if (!strcmp(arg, "--name-status"))
4603 options->output_format |= DIFF_FORMAT_NAME_STATUS;
4604 else if (!strcmp(arg, "-s") || !strcmp(arg, "--no-patch"))
4605 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
4606 else if (starts_with(arg, "--stat"))
4607 /* --stat, --stat-width, --stat-name-width, or --stat-count */
4608 return stat_opt(options, av);
4609
4610 /* renames options */
4611 else if (starts_with(arg, "-B") || starts_with(arg, "--break-rewrites=") ||
4612 !strcmp(arg, "--break-rewrites")) {
4613 if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
4614 return error("invalid argument to -B: %s", arg+2);
4615 }
4616 else if (starts_with(arg, "-M") || starts_with(arg, "--find-renames=") ||
4617 !strcmp(arg, "--find-renames")) {
4618 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
4619 return error("invalid argument to -M: %s", arg+2);
4620 options->detect_rename = DIFF_DETECT_RENAME;
4621 }
4622 else if (!strcmp(arg, "-D") || !strcmp(arg, "--irreversible-delete")) {
4623 options->irreversible_delete = 1;
4624 }
4625 else if (starts_with(arg, "-C") || starts_with(arg, "--find-copies=") ||
4626 !strcmp(arg, "--find-copies")) {
4627 if (options->detect_rename == DIFF_DETECT_COPY)
4628 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
4629 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
4630 return error("invalid argument to -C: %s", arg+2);
4631 options->detect_rename = DIFF_DETECT_COPY;
4632 }
4633 else if (!strcmp(arg, "--no-renames"))
4634 options->detect_rename = 0;
4635 else if (!strcmp(arg, "--rename-empty"))
4636 DIFF_OPT_SET(options, RENAME_EMPTY);
4637 else if (!strcmp(arg, "--no-rename-empty"))
4638 DIFF_OPT_CLR(options, RENAME_EMPTY);
4639 else if (!strcmp(arg, "--relative"))
4640 DIFF_OPT_SET(options, RELATIVE_NAME);
4641 else if (skip_prefix(arg, "--relative=", &arg)) {
4642 DIFF_OPT_SET(options, RELATIVE_NAME);
4643 options->prefix = arg;
4644 }
4645
4646 /* xdiff options */
4647 else if (!strcmp(arg, "--minimal"))
4648 DIFF_XDL_SET(options, NEED_MINIMAL);
4649 else if (!strcmp(arg, "--no-minimal"))
4650 DIFF_XDL_CLR(options, NEED_MINIMAL);
4651 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
4652 DIFF_XDL_SET(options, IGNORE_WHITESPACE);
4653 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
4654 DIFF_XDL_SET(options, IGNORE_WHITESPACE_CHANGE);
4655 else if (!strcmp(arg, "--ignore-space-at-eol"))
4656 DIFF_XDL_SET(options, IGNORE_WHITESPACE_AT_EOL);
4657 else if (!strcmp(arg, "--ignore-blank-lines"))
4658 DIFF_XDL_SET(options, IGNORE_BLANK_LINES);
4659 else if (!strcmp(arg, "--indent-heuristic"))
4660 DIFF_XDL_SET(options, INDENT_HEURISTIC);
4661 else if (!strcmp(arg, "--no-indent-heuristic"))
4662 DIFF_XDL_CLR(options, INDENT_HEURISTIC);
4663 else if (!strcmp(arg, "--patience"))
4664 options->xdl_opts = DIFF_WITH_ALG(options, PATIENCE_DIFF);
4665 else if (!strcmp(arg, "--histogram"))
4666 options->xdl_opts = DIFF_WITH_ALG(options, HISTOGRAM_DIFF);
4667 else if ((argcount = parse_long_opt("diff-algorithm", av, &optarg))) {
4668 long value = parse_algorithm_value(optarg);
4669 if (value < 0)
4670 return error("option diff-algorithm accepts \"myers\", "
4671 "\"minimal\", \"patience\" and \"histogram\"");
4672 /* clear out previous settings */
4673 DIFF_XDL_CLR(options, NEED_MINIMAL);
4674 options->xdl_opts &= ~XDF_DIFF_ALGORITHM_MASK;
4675 options->xdl_opts |= value;
4676 return argcount;
4677 }
4678
4679 /* flags options */
4680 else if (!strcmp(arg, "--binary")) {
4681 enable_patch_output(&options->output_format);
4682 DIFF_OPT_SET(options, BINARY);
4683 }
4684 else if (!strcmp(arg, "--full-index"))
4685 DIFF_OPT_SET(options, FULL_INDEX);
4686 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
4687 DIFF_OPT_SET(options, TEXT);
4688 else if (!strcmp(arg, "-R"))
4689 DIFF_OPT_SET(options, REVERSE_DIFF);
4690 else if (!strcmp(arg, "--find-copies-harder"))
4691 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
4692 else if (!strcmp(arg, "--follow"))
4693 DIFF_OPT_SET(options, FOLLOW_RENAMES);
4694 else if (!strcmp(arg, "--no-follow")) {
4695 DIFF_OPT_CLR(options, FOLLOW_RENAMES);
4696 DIFF_OPT_CLR(options, DEFAULT_FOLLOW_RENAMES);
4697 } else if (!strcmp(arg, "--color"))
4698 options->use_color = 1;
4699 else if (skip_prefix(arg, "--color=", &arg)) {
4700 int value = git_config_colorbool(NULL, arg);
4701 if (value < 0)
4702 return error("option `color' expects \"always\", \"auto\", or \"never\"");
4703 options->use_color = value;
4704 }
4705 else if (!strcmp(arg, "--no-color"))
4706 options->use_color = 0;
4707 else if (!strcmp(arg, "--color-moved")) {
4708 if (diff_color_moved_default)
4709 options->color_moved = diff_color_moved_default;
4710 if (options->color_moved == COLOR_MOVED_NO)
4711 options->color_moved = COLOR_MOVED_DEFAULT;
4712 } else if (!strcmp(arg, "--no-color-moved"))
4713 options->color_moved = COLOR_MOVED_NO;
4714 else if (skip_prefix(arg, "--color-moved=", &arg)) {
4715 int cm = parse_color_moved(arg);
4716 if (cm < 0)
4717 die("bad --color-moved argument: %s", arg);
4718 options->color_moved = cm;
4719 } else if (!strcmp(arg, "--color-words")) {
4720 options->use_color = 1;
4721 options->word_diff = DIFF_WORDS_COLOR;
4722 }
4723 else if (skip_prefix(arg, "--color-words=", &arg)) {
4724 options->use_color = 1;
4725 options->word_diff = DIFF_WORDS_COLOR;
4726 options->word_regex = arg;
4727 }
4728 else if (!strcmp(arg, "--word-diff")) {
4729 if (options->word_diff == DIFF_WORDS_NONE)
4730 options->word_diff = DIFF_WORDS_PLAIN;
4731 }
4732 else if (skip_prefix(arg, "--word-diff=", &arg)) {
4733 if (!strcmp(arg, "plain"))
4734 options->word_diff = DIFF_WORDS_PLAIN;
4735 else if (!strcmp(arg, "color")) {
4736 options->use_color = 1;
4737 options->word_diff = DIFF_WORDS_COLOR;
4738 }
4739 else if (!strcmp(arg, "porcelain"))
4740 options->word_diff = DIFF_WORDS_PORCELAIN;
4741 else if (!strcmp(arg, "none"))
4742 options->word_diff = DIFF_WORDS_NONE;
4743 else
4744 die("bad --word-diff argument: %s", arg);
4745 }
4746 else if ((argcount = parse_long_opt("word-diff-regex", av, &optarg))) {
4747 if (options->word_diff == DIFF_WORDS_NONE)
4748 options->word_diff = DIFF_WORDS_PLAIN;
4749 options->word_regex = optarg;
4750 return argcount;
4751 }
4752 else if (!strcmp(arg, "--exit-code"))
4753 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
4754 else if (!strcmp(arg, "--quiet"))
4755 DIFF_OPT_SET(options, QUICK);
4756 else if (!strcmp(arg, "--ext-diff"))
4757 DIFF_OPT_SET(options, ALLOW_EXTERNAL);
4758 else if (!strcmp(arg, "--no-ext-diff"))
4759 DIFF_OPT_CLR(options, ALLOW_EXTERNAL);
4760 else if (!strcmp(arg, "--textconv"))
4761 DIFF_OPT_SET(options, ALLOW_TEXTCONV);
4762 else if (!strcmp(arg, "--no-textconv"))
4763 DIFF_OPT_CLR(options, ALLOW_TEXTCONV);
4764 else if (!strcmp(arg, "--ignore-submodules")) {
4765 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
4766 handle_ignore_submodules_arg(options, "all");
4767 } else if (skip_prefix(arg, "--ignore-submodules=", &arg)) {
4768 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
4769 handle_ignore_submodules_arg(options, arg);
4770 } else if (!strcmp(arg, "--submodule"))
4771 options->submodule_format = DIFF_SUBMODULE_LOG;
4772 else if (skip_prefix(arg, "--submodule=", &arg))
4773 return parse_submodule_opt(options, arg);
4774 else if (skip_prefix(arg, "--ws-error-highlight=", &arg))
4775 return parse_ws_error_highlight_opt(options, arg);
4776 else if (!strcmp(arg, "--ita-invisible-in-index"))
4777 options->ita_invisible_in_index = 1;
4778 else if (!strcmp(arg, "--ita-visible-in-index"))
4779 options->ita_invisible_in_index = 0;
4780
4781 /* misc options */
4782 else if (!strcmp(arg, "-z"))
4783 options->line_termination = 0;
4784 else if ((argcount = short_opt('l', av, &optarg))) {
4785 options->rename_limit = strtoul(optarg, NULL, 10);
4786 return argcount;
4787 }
4788 else if ((argcount = short_opt('S', av, &optarg))) {
4789 options->pickaxe = optarg;
4790 options->pickaxe_opts |= DIFF_PICKAXE_KIND_S;
4791 return argcount;
4792 } else if ((argcount = short_opt('G', av, &optarg))) {
4793 options->pickaxe = optarg;
4794 options->pickaxe_opts |= DIFF_PICKAXE_KIND_G;
4795 return argcount;
4796 }
4797 else if (!strcmp(arg, "--pickaxe-all"))
4798 options->pickaxe_opts |= DIFF_PICKAXE_ALL;
4799 else if (!strcmp(arg, "--pickaxe-regex"))
4800 options->pickaxe_opts |= DIFF_PICKAXE_REGEX;
4801 else if ((argcount = short_opt('O', av, &optarg))) {
4802 options->orderfile = prefix_filename(prefix, optarg);
4803 return argcount;
4804 }
4805 else if ((argcount = parse_long_opt("diff-filter", av, &optarg))) {
4806 int offending = parse_diff_filter_opt(optarg, options);
4807 if (offending)
4808 die("unknown change class '%c' in --diff-filter=%s",
4809 offending, optarg);
4810 return argcount;
4811 }
4812 else if (!strcmp(arg, "--no-abbrev"))
4813 options->abbrev = 0;
4814 else if (!strcmp(arg, "--abbrev"))
4815 options->abbrev = DEFAULT_ABBREV;
4816 else if (skip_prefix(arg, "--abbrev=", &arg)) {
4817 options->abbrev = strtoul(arg, NULL, 10);
4818 if (options->abbrev < MINIMUM_ABBREV)
4819 options->abbrev = MINIMUM_ABBREV;
4820 else if (40 < options->abbrev)
4821 options->abbrev = 40;
4822 }
4823 else if ((argcount = parse_long_opt("src-prefix", av, &optarg))) {
4824 options->a_prefix = optarg;
4825 return argcount;
4826 }
4827 else if ((argcount = parse_long_opt("line-prefix", av, &optarg))) {
4828 options->line_prefix = optarg;
4829 options->line_prefix_length = strlen(options->line_prefix);
4830 graph_setup_line_prefix(options);
4831 return argcount;
4832 }
4833 else if ((argcount = parse_long_opt("dst-prefix", av, &optarg))) {
4834 options->b_prefix = optarg;
4835 return argcount;
4836 }
4837 else if (!strcmp(arg, "--no-prefix"))
4838 options->a_prefix = options->b_prefix = "";
4839 else if (opt_arg(arg, '\0', "inter-hunk-context",
4840 &options->interhunkcontext))
4841 ;
4842 else if (!strcmp(arg, "-W"))
4843 DIFF_OPT_SET(options, FUNCCONTEXT);
4844 else if (!strcmp(arg, "--function-context"))
4845 DIFF_OPT_SET(options, FUNCCONTEXT);
4846 else if (!strcmp(arg, "--no-function-context"))
4847 DIFF_OPT_CLR(options, FUNCCONTEXT);
4848 else if ((argcount = parse_long_opt("output", av, &optarg))) {
4849 char *path = prefix_filename(prefix, optarg);
4850 options->file = xfopen(path, "w");
4851 options->close_file = 1;
4852 if (options->use_color != GIT_COLOR_ALWAYS)
4853 options->use_color = GIT_COLOR_NEVER;
4854 free(path);
4855 return argcount;
4856 } else
4857 return 0;
4858 return 1;
4859 }
4860
4861 int parse_rename_score(const char **cp_p)
4862 {
4863 unsigned long num, scale;
4864 int ch, dot;
4865 const char *cp = *cp_p;
4866
4867 num = 0;
4868 scale = 1;
4869 dot = 0;
4870 for (;;) {
4871 ch = *cp;
4872 if ( !dot && ch == '.' ) {
4873 scale = 1;
4874 dot = 1;
4875 } else if ( ch == '%' ) {
4876 scale = dot ? scale*100 : 100;
4877 cp++; /* % is always at the end */
4878 break;
4879 } else if ( ch >= '0' && ch <= '9' ) {
4880 if ( scale < 100000 ) {
4881 scale *= 10;
4882 num = (num*10) + (ch-'0');
4883 }
4884 } else {
4885 break;
4886 }
4887 cp++;
4888 }
4889 *cp_p = cp;
4890
4891 /* user says num divided by scale and we say internally that
4892 * is MAX_SCORE * num / scale.
4893 */
4894 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
4895 }
4896
4897 static int diff_scoreopt_parse(const char *opt)
4898 {
4899 int opt1, opt2, cmd;
4900
4901 if (*opt++ != '-')
4902 return -1;
4903 cmd = *opt++;
4904 if (cmd == '-') {
4905 /* convert the long-form arguments into short-form versions */
4906 if (skip_prefix(opt, "break-rewrites", &opt)) {
4907 if (*opt == 0 || *opt++ == '=')
4908 cmd = 'B';
4909 } else if (skip_prefix(opt, "find-copies", &opt)) {
4910 if (*opt == 0 || *opt++ == '=')
4911 cmd = 'C';
4912 } else if (skip_prefix(opt, "find-renames", &opt)) {
4913 if (*opt == 0 || *opt++ == '=')
4914 cmd = 'M';
4915 }
4916 }
4917 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
4918 return -1; /* that is not a -M, -C, or -B option */
4919
4920 opt1 = parse_rename_score(&opt);
4921 if (cmd != 'B')
4922 opt2 = 0;
4923 else {
4924 if (*opt == 0)
4925 opt2 = 0;
4926 else if (*opt != '/')
4927 return -1; /* we expect -B80/99 or -B80 */
4928 else {
4929 opt++;
4930 opt2 = parse_rename_score(&opt);
4931 }
4932 }
4933 if (*opt != 0)
4934 return -1;
4935 return opt1 | (opt2 << 16);
4936 }
4937
4938 struct diff_queue_struct diff_queued_diff;
4939
4940 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
4941 {
4942 ALLOC_GROW(queue->queue, queue->nr + 1, queue->alloc);
4943 queue->queue[queue->nr++] = dp;
4944 }
4945
4946 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
4947 struct diff_filespec *one,
4948 struct diff_filespec *two)
4949 {
4950 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
4951 dp->one = one;
4952 dp->two = two;
4953 if (queue)
4954 diff_q(queue, dp);
4955 return dp;
4956 }
4957
4958 void diff_free_filepair(struct diff_filepair *p)
4959 {
4960 free_filespec(p->one);
4961 free_filespec(p->two);
4962 free(p);
4963 }
4964
4965 const char *diff_aligned_abbrev(const struct object_id *oid, int len)
4966 {
4967 int abblen;
4968 const char *abbrev;
4969
4970 if (len == GIT_SHA1_HEXSZ)
4971 return oid_to_hex(oid);
4972
4973 abbrev = diff_abbrev_oid(oid, len);
4974 abblen = strlen(abbrev);
4975
4976 /*
4977 * In well-behaved cases, where the abbbreviated result is the
4978 * same as the requested length, append three dots after the
4979 * abbreviation (hence the whole logic is limited to the case
4980 * where abblen < 37); when the actual abbreviated result is a
4981 * bit longer than the requested length, we reduce the number
4982 * of dots so that they match the well-behaved ones. However,
4983 * if the actual abbreviation is longer than the requested
4984 * length by more than three, we give up on aligning, and add
4985 * three dots anyway, to indicate that the output is not the
4986 * full object name. Yes, this may be suboptimal, but this
4987 * appears only in "diff --raw --abbrev" output and it is not
4988 * worth the effort to change it now. Note that this would
4989 * likely to work fine when the automatic sizing of default
4990 * abbreviation length is used--we would be fed -1 in "len" in
4991 * that case, and will end up always appending three-dots, but
4992 * the automatic sizing is supposed to give abblen that ensures
4993 * uniqueness across all objects (statistically speaking).
4994 */
4995 if (abblen < GIT_SHA1_HEXSZ - 3) {
4996 static char hex[GIT_MAX_HEXSZ + 1];
4997 if (len < abblen && abblen <= len + 2)
4998 xsnprintf(hex, sizeof(hex), "%s%.*s", abbrev, len+3-abblen, "..");
4999 else
5000 xsnprintf(hex, sizeof(hex), "%s...", abbrev);
5001 return hex;
5002 }
5003
5004 return oid_to_hex(oid);
5005 }
5006
5007 static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
5008 {
5009 int line_termination = opt->line_termination;
5010 int inter_name_termination = line_termination ? '\t' : '\0';
5011
5012 fprintf(opt->file, "%s", diff_line_prefix(opt));
5013 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
5014 fprintf(opt->file, ":%06o %06o %s ", p->one->mode, p->two->mode,
5015 diff_aligned_abbrev(&p->one->oid, opt->abbrev));
5016 fprintf(opt->file, "%s ",
5017 diff_aligned_abbrev(&p->two->oid, opt->abbrev));
5018 }
5019 if (p->score) {
5020 fprintf(opt->file, "%c%03d%c", p->status, similarity_index(p),
5021 inter_name_termination);
5022 } else {
5023 fprintf(opt->file, "%c%c", p->status, inter_name_termination);
5024 }
5025
5026 if (p->status == DIFF_STATUS_COPIED ||
5027 p->status == DIFF_STATUS_RENAMED) {
5028 const char *name_a, *name_b;
5029 name_a = p->one->path;
5030 name_b = p->two->path;
5031 strip_prefix(opt->prefix_length, &name_a, &name_b);
5032 write_name_quoted(name_a, opt->file, inter_name_termination);
5033 write_name_quoted(name_b, opt->file, line_termination);
5034 } else {
5035 const char *name_a, *name_b;
5036 name_a = p->one->mode ? p->one->path : p->two->path;
5037 name_b = NULL;
5038 strip_prefix(opt->prefix_length, &name_a, &name_b);
5039 write_name_quoted(name_a, opt->file, line_termination);
5040 }
5041 }
5042
5043 int diff_unmodified_pair(struct diff_filepair *p)
5044 {
5045 /* This function is written stricter than necessary to support
5046 * the currently implemented transformers, but the idea is to
5047 * let transformers to produce diff_filepairs any way they want,
5048 * and filter and clean them up here before producing the output.
5049 */
5050 struct diff_filespec *one = p->one, *two = p->two;
5051
5052 if (DIFF_PAIR_UNMERGED(p))
5053 return 0; /* unmerged is interesting */
5054
5055 /* deletion, addition, mode or type change
5056 * and rename are all interesting.
5057 */
5058 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
5059 DIFF_PAIR_MODE_CHANGED(p) ||
5060 strcmp(one->path, two->path))
5061 return 0;
5062
5063 /* both are valid and point at the same path. that is, we are
5064 * dealing with a change.
5065 */
5066 if (one->oid_valid && two->oid_valid &&
5067 !oidcmp(&one->oid, &two->oid) &&
5068 !one->dirty_submodule && !two->dirty_submodule)
5069 return 1; /* no change */
5070 if (!one->oid_valid && !two->oid_valid)
5071 return 1; /* both look at the same file on the filesystem. */
5072 return 0;
5073 }
5074
5075 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
5076 {
5077 if (diff_unmodified_pair(p))
5078 return;
5079
5080 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
5081 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
5082 return; /* no tree diffs in patch format */
5083
5084 run_diff(p, o);
5085 }
5086
5087 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
5088 struct diffstat_t *diffstat)
5089 {
5090 if (diff_unmodified_pair(p))
5091 return;
5092
5093 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
5094 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
5095 return; /* no useful stat for tree diffs */
5096
5097 run_diffstat(p, o, diffstat);
5098 }
5099
5100 static void diff_flush_checkdiff(struct diff_filepair *p,
5101 struct diff_options *o)
5102 {
5103 if (diff_unmodified_pair(p))
5104 return;
5105
5106 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
5107 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
5108 return; /* nothing to check in tree diffs */
5109
5110 run_checkdiff(p, o);
5111 }
5112
5113 int diff_queue_is_empty(void)
5114 {
5115 struct diff_queue_struct *q = &diff_queued_diff;
5116 int i;
5117 for (i = 0; i < q->nr; i++)
5118 if (!diff_unmodified_pair(q->queue[i]))
5119 return 0;
5120 return 1;
5121 }
5122
5123 #if DIFF_DEBUG
5124 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
5125 {
5126 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
5127 x, one ? one : "",
5128 s->path,
5129 DIFF_FILE_VALID(s) ? "valid" : "invalid",
5130 s->mode,
5131 s->oid_valid ? oid_to_hex(&s->oid) : "");
5132 fprintf(stderr, "queue[%d] %s size %lu\n",
5133 x, one ? one : "",
5134 s->size);
5135 }
5136
5137 void diff_debug_filepair(const struct diff_filepair *p, int i)
5138 {
5139 diff_debug_filespec(p->one, i, "one");
5140 diff_debug_filespec(p->two, i, "two");
5141 fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
5142 p->score, p->status ? p->status : '?',
5143 p->one->rename_used, p->broken_pair);
5144 }
5145
5146 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
5147 {
5148 int i;
5149 if (msg)
5150 fprintf(stderr, "%s\n", msg);
5151 fprintf(stderr, "q->nr = %d\n", q->nr);
5152 for (i = 0; i < q->nr; i++) {
5153 struct diff_filepair *p = q->queue[i];
5154 diff_debug_filepair(p, i);
5155 }
5156 }
5157 #endif
5158
5159 static void diff_resolve_rename_copy(void)
5160 {
5161 int i;
5162 struct diff_filepair *p;
5163 struct diff_queue_struct *q = &diff_queued_diff;
5164
5165 diff_debug_queue("resolve-rename-copy", q);
5166
5167 for (i = 0; i < q->nr; i++) {
5168 p = q->queue[i];
5169 p->status = 0; /* undecided */
5170 if (DIFF_PAIR_UNMERGED(p))
5171 p->status = DIFF_STATUS_UNMERGED;
5172 else if (!DIFF_FILE_VALID(p->one))
5173 p->status = DIFF_STATUS_ADDED;
5174 else if (!DIFF_FILE_VALID(p->two))
5175 p->status = DIFF_STATUS_DELETED;
5176 else if (DIFF_PAIR_TYPE_CHANGED(p))
5177 p->status = DIFF_STATUS_TYPE_CHANGED;
5178
5179 /* from this point on, we are dealing with a pair
5180 * whose both sides are valid and of the same type, i.e.
5181 * either in-place edit or rename/copy edit.
5182 */
5183 else if (DIFF_PAIR_RENAME(p)) {
5184 /*
5185 * A rename might have re-connected a broken
5186 * pair up, causing the pathnames to be the
5187 * same again. If so, that's not a rename at
5188 * all, just a modification..
5189 *
5190 * Otherwise, see if this source was used for
5191 * multiple renames, in which case we decrement
5192 * the count, and call it a copy.
5193 */
5194 if (!strcmp(p->one->path, p->two->path))
5195 p->status = DIFF_STATUS_MODIFIED;
5196 else if (--p->one->rename_used > 0)
5197 p->status = DIFF_STATUS_COPIED;
5198 else
5199 p->status = DIFF_STATUS_RENAMED;
5200 }
5201 else if (oidcmp(&p->one->oid, &p->two->oid) ||
5202 p->one->mode != p->two->mode ||
5203 p->one->dirty_submodule ||
5204 p->two->dirty_submodule ||
5205 is_null_oid(&p->one->oid))
5206 p->status = DIFF_STATUS_MODIFIED;
5207 else {
5208 /* This is a "no-change" entry and should not
5209 * happen anymore, but prepare for broken callers.
5210 */
5211 error("feeding unmodified %s to diffcore",
5212 p->one->path);
5213 p->status = DIFF_STATUS_UNKNOWN;
5214 }
5215 }
5216 diff_debug_queue("resolve-rename-copy done", q);
5217 }
5218
5219 static int check_pair_status(struct diff_filepair *p)
5220 {
5221 switch (p->status) {
5222 case DIFF_STATUS_UNKNOWN:
5223 return 0;
5224 case 0:
5225 die("internal error in diff-resolve-rename-copy");
5226 default:
5227 return 1;
5228 }
5229 }
5230
5231 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
5232 {
5233 int fmt = opt->output_format;
5234
5235 if (fmt & DIFF_FORMAT_CHECKDIFF)
5236 diff_flush_checkdiff(p, opt);
5237 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
5238 diff_flush_raw(p, opt);
5239 else if (fmt & DIFF_FORMAT_NAME) {
5240 const char *name_a, *name_b;
5241 name_a = p->two->path;
5242 name_b = NULL;
5243 strip_prefix(opt->prefix_length, &name_a, &name_b);
5244 fprintf(opt->file, "%s", diff_line_prefix(opt));
5245 write_name_quoted(name_a, opt->file, opt->line_termination);
5246 }
5247 }
5248
5249 static void show_file_mode_name(struct diff_options *opt, const char *newdelete, struct diff_filespec *fs)
5250 {
5251 struct strbuf sb = STRBUF_INIT;
5252 if (fs->mode)
5253 strbuf_addf(&sb, " %s mode %06o ", newdelete, fs->mode);
5254 else
5255 strbuf_addf(&sb, " %s ", newdelete);
5256
5257 quote_c_style(fs->path, &sb, NULL, 0);
5258 strbuf_addch(&sb, '\n');
5259 emit_diff_symbol(opt, DIFF_SYMBOL_SUMMARY,
5260 sb.buf, sb.len, 0);
5261 strbuf_release(&sb);
5262 }
5263
5264 static void show_mode_change(struct diff_options *opt, struct diff_filepair *p,
5265 int show_name)
5266 {
5267 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
5268 struct strbuf sb = STRBUF_INIT;
5269 strbuf_addf(&sb, " mode change %06o => %06o",
5270 p->one->mode, p->two->mode);
5271 if (show_name) {
5272 strbuf_addch(&sb, ' ');
5273 quote_c_style(p->two->path, &sb, NULL, 0);
5274 }
5275 strbuf_addch(&sb, '\n');
5276 emit_diff_symbol(opt, DIFF_SYMBOL_SUMMARY,
5277 sb.buf, sb.len, 0);
5278 strbuf_release(&sb);
5279 }
5280 }
5281
5282 static void show_rename_copy(struct diff_options *opt, const char *renamecopy,
5283 struct diff_filepair *p)
5284 {
5285 struct strbuf sb = STRBUF_INIT;
5286 char *names = pprint_rename(p->one->path, p->two->path);
5287 strbuf_addf(&sb, " %s %s (%d%%)\n",
5288 renamecopy, names, similarity_index(p));
5289 free(names);
5290 emit_diff_symbol(opt, DIFF_SYMBOL_SUMMARY,
5291 sb.buf, sb.len, 0);
5292 show_mode_change(opt, p, 0);
5293 strbuf_release(&sb);
5294 }
5295
5296 static void diff_summary(struct diff_options *opt, struct diff_filepair *p)
5297 {
5298 switch(p->status) {
5299 case DIFF_STATUS_DELETED:
5300 show_file_mode_name(opt, "delete", p->one);
5301 break;
5302 case DIFF_STATUS_ADDED:
5303 show_file_mode_name(opt, "create", p->two);
5304 break;
5305 case DIFF_STATUS_COPIED:
5306 show_rename_copy(opt, "copy", p);
5307 break;
5308 case DIFF_STATUS_RENAMED:
5309 show_rename_copy(opt, "rename", p);
5310 break;
5311 default:
5312 if (p->score) {
5313 struct strbuf sb = STRBUF_INIT;
5314 strbuf_addstr(&sb, " rewrite ");
5315 quote_c_style(p->two->path, &sb, NULL, 0);
5316 strbuf_addf(&sb, " (%d%%)\n", similarity_index(p));
5317 emit_diff_symbol(opt, DIFF_SYMBOL_SUMMARY,
5318 sb.buf, sb.len, 0);
5319 strbuf_release(&sb);
5320 }
5321 show_mode_change(opt, p, !p->score);
5322 break;
5323 }
5324 }
5325
5326 struct patch_id_t {
5327 git_SHA_CTX *ctx;
5328 int patchlen;
5329 };
5330
5331 static int remove_space(char *line, int len)
5332 {
5333 int i;
5334 char *dst = line;
5335 unsigned char c;
5336
5337 for (i = 0; i < len; i++)
5338 if (!isspace((c = line[i])))
5339 *dst++ = c;
5340
5341 return dst - line;
5342 }
5343
5344 static void patch_id_consume(void *priv, char *line, unsigned long len)
5345 {
5346 struct patch_id_t *data = priv;
5347 int new_len;
5348
5349 /* Ignore line numbers when computing the SHA1 of the patch */
5350 if (starts_with(line, "@@ -"))
5351 return;
5352
5353 new_len = remove_space(line, len);
5354
5355 git_SHA1_Update(data->ctx, line, new_len);
5356 data->patchlen += new_len;
5357 }
5358
5359 static void patch_id_add_string(git_SHA_CTX *ctx, const char *str)
5360 {
5361 git_SHA1_Update(ctx, str, strlen(str));
5362 }
5363
5364 static void patch_id_add_mode(git_SHA_CTX *ctx, unsigned mode)
5365 {
5366 /* large enough for 2^32 in octal */
5367 char buf[12];
5368 int len = xsnprintf(buf, sizeof(buf), "%06o", mode);
5369 git_SHA1_Update(ctx, buf, len);
5370 }
5371
5372 /* returns 0 upon success, and writes result into sha1 */
5373 static int diff_get_patch_id(struct diff_options *options, struct object_id *oid, int diff_header_only)
5374 {
5375 struct diff_queue_struct *q = &diff_queued_diff;
5376 int i;
5377 git_SHA_CTX ctx;
5378 struct patch_id_t data;
5379
5380 git_SHA1_Init(&ctx);
5381 memset(&data, 0, sizeof(struct patch_id_t));
5382 data.ctx = &ctx;
5383
5384 for (i = 0; i < q->nr; i++) {
5385 xpparam_t xpp;
5386 xdemitconf_t xecfg;
5387 mmfile_t mf1, mf2;
5388 struct diff_filepair *p = q->queue[i];
5389 int len1, len2;
5390
5391 memset(&xpp, 0, sizeof(xpp));
5392 memset(&xecfg, 0, sizeof(xecfg));
5393 if (p->status == 0)
5394 return error("internal diff status error");
5395 if (p->status == DIFF_STATUS_UNKNOWN)
5396 continue;
5397 if (diff_unmodified_pair(p))
5398 continue;
5399 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
5400 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
5401 continue;
5402 if (DIFF_PAIR_UNMERGED(p))
5403 continue;
5404
5405 diff_fill_oid_info(p->one);
5406 diff_fill_oid_info(p->two);
5407
5408 len1 = remove_space(p->one->path, strlen(p->one->path));
5409 len2 = remove_space(p->two->path, strlen(p->two->path));
5410 patch_id_add_string(&ctx, "diff--git");
5411 patch_id_add_string(&ctx, "a/");
5412 git_SHA1_Update(&ctx, p->one->path, len1);
5413 patch_id_add_string(&ctx, "b/");
5414 git_SHA1_Update(&ctx, p->two->path, len2);
5415
5416 if (p->one->mode == 0) {
5417 patch_id_add_string(&ctx, "newfilemode");
5418 patch_id_add_mode(&ctx, p->two->mode);
5419 patch_id_add_string(&ctx, "---/dev/null");
5420 patch_id_add_string(&ctx, "+++b/");
5421 git_SHA1_Update(&ctx, p->two->path, len2);
5422 } else if (p->two->mode == 0) {
5423 patch_id_add_string(&ctx, "deletedfilemode");
5424 patch_id_add_mode(&ctx, p->one->mode);
5425 patch_id_add_string(&ctx, "---a/");
5426 git_SHA1_Update(&ctx, p->one->path, len1);
5427 patch_id_add_string(&ctx, "+++/dev/null");
5428 } else {
5429 patch_id_add_string(&ctx, "---a/");
5430 git_SHA1_Update(&ctx, p->one->path, len1);
5431 patch_id_add_string(&ctx, "+++b/");
5432 git_SHA1_Update(&ctx, p->two->path, len2);
5433 }
5434
5435 if (diff_header_only)
5436 continue;
5437
5438 if (fill_mmfile(&mf1, p->one) < 0 ||
5439 fill_mmfile(&mf2, p->two) < 0)
5440 return error("unable to read files to diff");
5441
5442 if (diff_filespec_is_binary(p->one) ||
5443 diff_filespec_is_binary(p->two)) {
5444 git_SHA1_Update(&ctx, oid_to_hex(&p->one->oid),
5445 GIT_SHA1_HEXSZ);
5446 git_SHA1_Update(&ctx, oid_to_hex(&p->two->oid),
5447 GIT_SHA1_HEXSZ);
5448 continue;
5449 }
5450
5451 xpp.flags = 0;
5452 xecfg.ctxlen = 3;
5453 xecfg.flags = 0;
5454 if (xdi_diff_outf(&mf1, &mf2, patch_id_consume, &data,
5455 &xpp, &xecfg))
5456 return error("unable to generate patch-id diff for %s",
5457 p->one->path);
5458 }
5459
5460 git_SHA1_Final(oid->hash, &ctx);
5461 return 0;
5462 }
5463
5464 int diff_flush_patch_id(struct diff_options *options, struct object_id *oid, int diff_header_only)
5465 {
5466 struct diff_queue_struct *q = &diff_queued_diff;
5467 int i;
5468 int result = diff_get_patch_id(options, oid, diff_header_only);
5469
5470 for (i = 0; i < q->nr; i++)
5471 diff_free_filepair(q->queue[i]);
5472
5473 free(q->queue);
5474 DIFF_QUEUE_CLEAR(q);
5475
5476 return result;
5477 }
5478
5479 static int is_summary_empty(const struct diff_queue_struct *q)
5480 {
5481 int i;
5482
5483 for (i = 0; i < q->nr; i++) {
5484 const struct diff_filepair *p = q->queue[i];
5485
5486 switch (p->status) {
5487 case DIFF_STATUS_DELETED:
5488 case DIFF_STATUS_ADDED:
5489 case DIFF_STATUS_COPIED:
5490 case DIFF_STATUS_RENAMED:
5491 return 0;
5492 default:
5493 if (p->score)
5494 return 0;
5495 if (p->one->mode && p->two->mode &&
5496 p->one->mode != p->two->mode)
5497 return 0;
5498 break;
5499 }
5500 }
5501 return 1;
5502 }
5503
5504 static const char rename_limit_warning[] =
5505 N_("inexact rename detection was skipped due to too many files.");
5506
5507 static const char degrade_cc_to_c_warning[] =
5508 N_("only found copies from modified paths due to too many files.");
5509
5510 static const char rename_limit_advice[] =
5511 N_("you may want to set your %s variable to at least "
5512 "%d and retry the command.");
5513
5514 void diff_warn_rename_limit(const char *varname, int needed, int degraded_cc)
5515 {
5516 if (degraded_cc)
5517 warning(_(degrade_cc_to_c_warning));
5518 else if (needed)
5519 warning(_(rename_limit_warning));
5520 else
5521 return;
5522 if (0 < needed && needed < 32767)
5523 warning(_(rename_limit_advice), varname, needed);
5524 }
5525
5526 static void diff_flush_patch_all_file_pairs(struct diff_options *o)
5527 {
5528 int i;
5529 static struct emitted_diff_symbols esm = EMITTED_DIFF_SYMBOLS_INIT;
5530 struct diff_queue_struct *q = &diff_queued_diff;
5531
5532 if (WSEH_NEW & WS_RULE_MASK)
5533 die("BUG: WS rules bit mask overlaps with diff symbol flags");
5534
5535 if (o->color_moved)
5536 o->emitted_symbols = &esm;
5537
5538 for (i = 0; i < q->nr; i++) {
5539 struct diff_filepair *p = q->queue[i];
5540 if (check_pair_status(p))
5541 diff_flush_patch(p, o);
5542 }
5543
5544 if (o->emitted_symbols) {
5545 if (o->color_moved) {
5546 struct hashmap add_lines, del_lines;
5547
5548 hashmap_init(&del_lines,
5549 (hashmap_cmp_fn)moved_entry_cmp, o, 0);
5550 hashmap_init(&add_lines,
5551 (hashmap_cmp_fn)moved_entry_cmp, o, 0);
5552
5553 add_lines_to_move_detection(o, &add_lines, &del_lines);
5554 mark_color_as_moved(o, &add_lines, &del_lines);
5555 if (o->color_moved == COLOR_MOVED_ZEBRA_DIM)
5556 dim_moved_lines(o);
5557
5558 hashmap_free(&add_lines, 0);
5559 hashmap_free(&del_lines, 0);
5560 }
5561
5562 for (i = 0; i < esm.nr; i++)
5563 emit_diff_symbol_from_struct(o, &esm.buf[i]);
5564
5565 for (i = 0; i < esm.nr; i++)
5566 free((void *)esm.buf[i].line);
5567 }
5568 esm.nr = 0;
5569 }
5570
5571 void diff_flush(struct diff_options *options)
5572 {
5573 struct diff_queue_struct *q = &diff_queued_diff;
5574 int i, output_format = options->output_format;
5575 int separator = 0;
5576 int dirstat_by_line = 0;
5577
5578 /*
5579 * Order: raw, stat, summary, patch
5580 * or: name/name-status/checkdiff (other bits clear)
5581 */
5582 if (!q->nr)
5583 goto free_queue;
5584
5585 if (output_format & (DIFF_FORMAT_RAW |
5586 DIFF_FORMAT_NAME |
5587 DIFF_FORMAT_NAME_STATUS |
5588 DIFF_FORMAT_CHECKDIFF)) {
5589 for (i = 0; i < q->nr; i++) {
5590 struct diff_filepair *p = q->queue[i];
5591 if (check_pair_status(p))
5592 flush_one_pair(p, options);
5593 }
5594 separator++;
5595 }
5596
5597 if (output_format & DIFF_FORMAT_DIRSTAT && DIFF_OPT_TST(options, DIRSTAT_BY_LINE))
5598 dirstat_by_line = 1;
5599
5600 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT) ||
5601 dirstat_by_line) {
5602 struct diffstat_t diffstat;
5603
5604 memset(&diffstat, 0, sizeof(struct diffstat_t));
5605 for (i = 0; i < q->nr; i++) {
5606 struct diff_filepair *p = q->queue[i];
5607 if (check_pair_status(p))
5608 diff_flush_stat(p, options, &diffstat);
5609 }
5610 if (output_format & DIFF_FORMAT_NUMSTAT)
5611 show_numstat(&diffstat, options);
5612 if (output_format & DIFF_FORMAT_DIFFSTAT)
5613 show_stats(&diffstat, options);
5614 if (output_format & DIFF_FORMAT_SHORTSTAT)
5615 show_shortstats(&diffstat, options);
5616 if (output_format & DIFF_FORMAT_DIRSTAT && dirstat_by_line)
5617 show_dirstat_by_line(&diffstat, options);
5618 free_diffstat_info(&diffstat);
5619 separator++;
5620 }
5621 if ((output_format & DIFF_FORMAT_DIRSTAT) && !dirstat_by_line)
5622 show_dirstat(options);
5623
5624 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
5625 for (i = 0; i < q->nr; i++) {
5626 diff_summary(options, q->queue[i]);
5627 }
5628 separator++;
5629 }
5630
5631 if (output_format & DIFF_FORMAT_NO_OUTPUT &&
5632 DIFF_OPT_TST(options, EXIT_WITH_STATUS) &&
5633 DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
5634 /*
5635 * run diff_flush_patch for the exit status. setting
5636 * options->file to /dev/null should be safe, because we
5637 * aren't supposed to produce any output anyway.
5638 */
5639 if (options->close_file)
5640 fclose(options->file);
5641 options->file = xfopen("/dev/null", "w");
5642 options->close_file = 1;
5643 options->color_moved = 0;
5644 for (i = 0; i < q->nr; i++) {
5645 struct diff_filepair *p = q->queue[i];
5646 if (check_pair_status(p))
5647 diff_flush_patch(p, options);
5648 if (options->found_changes)
5649 break;
5650 }
5651 }
5652
5653 if (output_format & DIFF_FORMAT_PATCH) {
5654 if (separator) {
5655 emit_diff_symbol(options, DIFF_SYMBOL_SEPARATOR, NULL, 0, 0);
5656 if (options->stat_sep)
5657 /* attach patch instead of inline */
5658 emit_diff_symbol(options, DIFF_SYMBOL_STAT_SEP,
5659 NULL, 0, 0);
5660 }
5661
5662 diff_flush_patch_all_file_pairs(options);
5663 }
5664
5665 if (output_format & DIFF_FORMAT_CALLBACK)
5666 options->format_callback(q, options, options->format_callback_data);
5667
5668 for (i = 0; i < q->nr; i++)
5669 diff_free_filepair(q->queue[i]);
5670 free_queue:
5671 free(q->queue);
5672 DIFF_QUEUE_CLEAR(q);
5673 if (options->close_file)
5674 fclose(options->file);
5675
5676 /*
5677 * Report the content-level differences with HAS_CHANGES;
5678 * diff_addremove/diff_change does not set the bit when
5679 * DIFF_FROM_CONTENTS is in effect (e.g. with -w).
5680 */
5681 if (DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
5682 if (options->found_changes)
5683 DIFF_OPT_SET(options, HAS_CHANGES);
5684 else
5685 DIFF_OPT_CLR(options, HAS_CHANGES);
5686 }
5687 }
5688
5689 static int match_filter(const struct diff_options *options, const struct diff_filepair *p)
5690 {
5691 return (((p->status == DIFF_STATUS_MODIFIED) &&
5692 ((p->score &&
5693 filter_bit_tst(DIFF_STATUS_FILTER_BROKEN, options)) ||
5694 (!p->score &&
5695 filter_bit_tst(DIFF_STATUS_MODIFIED, options)))) ||
5696 ((p->status != DIFF_STATUS_MODIFIED) &&
5697 filter_bit_tst(p->status, options)));
5698 }
5699
5700 static void diffcore_apply_filter(struct diff_options *options)
5701 {
5702 int i;
5703 struct diff_queue_struct *q = &diff_queued_diff;
5704 struct diff_queue_struct outq;
5705
5706 DIFF_QUEUE_CLEAR(&outq);
5707
5708 if (!options->filter)
5709 return;
5710
5711 if (filter_bit_tst(DIFF_STATUS_FILTER_AON, options)) {
5712 int found;
5713 for (i = found = 0; !found && i < q->nr; i++) {
5714 if (match_filter(options, q->queue[i]))
5715 found++;
5716 }
5717 if (found)
5718 return;
5719
5720 /* otherwise we will clear the whole queue
5721 * by copying the empty outq at the end of this
5722 * function, but first clear the current entries
5723 * in the queue.
5724 */
5725 for (i = 0; i < q->nr; i++)
5726 diff_free_filepair(q->queue[i]);
5727 }
5728 else {
5729 /* Only the matching ones */
5730 for (i = 0; i < q->nr; i++) {
5731 struct diff_filepair *p = q->queue[i];
5732 if (match_filter(options, p))
5733 diff_q(&outq, p);
5734 else
5735 diff_free_filepair(p);
5736 }
5737 }
5738 free(q->queue);
5739 *q = outq;
5740 }
5741
5742 /* Check whether two filespecs with the same mode and size are identical */
5743 static int diff_filespec_is_identical(struct diff_filespec *one,
5744 struct diff_filespec *two)
5745 {
5746 if (S_ISGITLINK(one->mode))
5747 return 0;
5748 if (diff_populate_filespec(one, 0))
5749 return 0;
5750 if (diff_populate_filespec(two, 0))
5751 return 0;
5752 return !memcmp(one->data, two->data, one->size);
5753 }
5754
5755 static int diff_filespec_check_stat_unmatch(struct diff_filepair *p)
5756 {
5757 if (p->done_skip_stat_unmatch)
5758 return p->skip_stat_unmatch_result;
5759
5760 p->done_skip_stat_unmatch = 1;
5761 p->skip_stat_unmatch_result = 0;
5762 /*
5763 * 1. Entries that come from stat info dirtiness
5764 * always have both sides (iow, not create/delete),
5765 * one side of the object name is unknown, with
5766 * the same mode and size. Keep the ones that
5767 * do not match these criteria. They have real
5768 * differences.
5769 *
5770 * 2. At this point, the file is known to be modified,
5771 * with the same mode and size, and the object
5772 * name of one side is unknown. Need to inspect
5773 * the identical contents.
5774 */
5775 if (!DIFF_FILE_VALID(p->one) || /* (1) */
5776 !DIFF_FILE_VALID(p->two) ||
5777 (p->one->oid_valid && p->two->oid_valid) ||
5778 (p->one->mode != p->two->mode) ||
5779 diff_populate_filespec(p->one, CHECK_SIZE_ONLY) ||
5780 diff_populate_filespec(p->two, CHECK_SIZE_ONLY) ||
5781 (p->one->size != p->two->size) ||
5782 !diff_filespec_is_identical(p->one, p->two)) /* (2) */
5783 p->skip_stat_unmatch_result = 1;
5784 return p->skip_stat_unmatch_result;
5785 }
5786
5787 static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
5788 {
5789 int i;
5790 struct diff_queue_struct *q = &diff_queued_diff;
5791 struct diff_queue_struct outq;
5792 DIFF_QUEUE_CLEAR(&outq);
5793
5794 for (i = 0; i < q->nr; i++) {
5795 struct diff_filepair *p = q->queue[i];
5796
5797 if (diff_filespec_check_stat_unmatch(p))
5798 diff_q(&outq, p);
5799 else {
5800 /*
5801 * The caller can subtract 1 from skip_stat_unmatch
5802 * to determine how many paths were dirty only
5803 * due to stat info mismatch.
5804 */
5805 if (!DIFF_OPT_TST(diffopt, NO_INDEX))
5806 diffopt->skip_stat_unmatch++;
5807 diff_free_filepair(p);
5808 }
5809 }
5810 free(q->queue);
5811 *q = outq;
5812 }
5813
5814 static int diffnamecmp(const void *a_, const void *b_)
5815 {
5816 const struct diff_filepair *a = *((const struct diff_filepair **)a_);
5817 const struct diff_filepair *b = *((const struct diff_filepair **)b_);
5818 const char *name_a, *name_b;
5819
5820 name_a = a->one ? a->one->path : a->two->path;
5821 name_b = b->one ? b->one->path : b->two->path;
5822 return strcmp(name_a, name_b);
5823 }
5824
5825 void diffcore_fix_diff_index(struct diff_options *options)
5826 {
5827 struct diff_queue_struct *q = &diff_queued_diff;
5828 QSORT(q->queue, q->nr, diffnamecmp);
5829 }
5830
5831 void diffcore_std(struct diff_options *options)
5832 {
5833 /* NOTE please keep the following in sync with diff_tree_combined() */
5834 if (options->skip_stat_unmatch)
5835 diffcore_skip_stat_unmatch(options);
5836 if (!options->found_follow) {
5837 /* See try_to_follow_renames() in tree-diff.c */
5838 if (options->break_opt != -1)
5839 diffcore_break(options->break_opt);
5840 if (options->detect_rename)
5841 diffcore_rename(options);
5842 if (options->break_opt != -1)
5843 diffcore_merge_broken();
5844 }
5845 if (options->pickaxe)
5846 diffcore_pickaxe(options);
5847 if (options->orderfile)
5848 diffcore_order(options->orderfile);
5849 if (!options->found_follow)
5850 /* See try_to_follow_renames() in tree-diff.c */
5851 diff_resolve_rename_copy();
5852 diffcore_apply_filter(options);
5853
5854 if (diff_queued_diff.nr && !DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
5855 DIFF_OPT_SET(options, HAS_CHANGES);
5856 else
5857 DIFF_OPT_CLR(options, HAS_CHANGES);
5858
5859 options->found_follow = 0;
5860 }
5861
5862 int diff_result_code(struct diff_options *opt, int status)
5863 {
5864 int result = 0;
5865
5866 diff_warn_rename_limit("diff.renameLimit",
5867 opt->needed_rename_limit,
5868 opt->degraded_cc_to_c);
5869 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
5870 !(opt->output_format & DIFF_FORMAT_CHECKDIFF))
5871 return status;
5872 if (DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
5873 DIFF_OPT_TST(opt, HAS_CHANGES))
5874 result |= 01;
5875 if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) &&
5876 DIFF_OPT_TST(opt, CHECK_FAILED))
5877 result |= 02;
5878 return result;
5879 }
5880
5881 int diff_can_quit_early(struct diff_options *opt)
5882 {
5883 return (DIFF_OPT_TST(opt, QUICK) &&
5884 !opt->filter &&
5885 DIFF_OPT_TST(opt, HAS_CHANGES));
5886 }
5887
5888 /*
5889 * Shall changes to this submodule be ignored?
5890 *
5891 * Submodule changes can be configured to be ignored separately for each path,
5892 * but that configuration can be overridden from the command line.
5893 */
5894 static int is_submodule_ignored(const char *path, struct diff_options *options)
5895 {
5896 int ignored = 0;
5897 unsigned orig_flags = options->flags;
5898 if (!DIFF_OPT_TST(options, OVERRIDE_SUBMODULE_CONFIG))
5899 set_diffopt_flags_from_submodule_config(options, path);
5900 if (DIFF_OPT_TST(options, IGNORE_SUBMODULES))
5901 ignored = 1;
5902 options->flags = orig_flags;
5903 return ignored;
5904 }
5905
5906 void diff_addremove(struct diff_options *options,
5907 int addremove, unsigned mode,
5908 const struct object_id *oid,
5909 int oid_valid,
5910 const char *concatpath, unsigned dirty_submodule)
5911 {
5912 struct diff_filespec *one, *two;
5913
5914 if (S_ISGITLINK(mode) && is_submodule_ignored(concatpath, options))
5915 return;
5916
5917 /* This may look odd, but it is a preparation for
5918 * feeding "there are unchanged files which should
5919 * not produce diffs, but when you are doing copy
5920 * detection you would need them, so here they are"
5921 * entries to the diff-core. They will be prefixed
5922 * with something like '=' or '*' (I haven't decided
5923 * which but should not make any difference).
5924 * Feeding the same new and old to diff_change()
5925 * also has the same effect.
5926 * Before the final output happens, they are pruned after
5927 * merged into rename/copy pairs as appropriate.
5928 */
5929 if (DIFF_OPT_TST(options, REVERSE_DIFF))
5930 addremove = (addremove == '+' ? '-' :
5931 addremove == '-' ? '+' : addremove);
5932
5933 if (options->prefix &&
5934 strncmp(concatpath, options->prefix, options->prefix_length))
5935 return;
5936
5937 one = alloc_filespec(concatpath);
5938 two = alloc_filespec(concatpath);
5939
5940 if (addremove != '+')
5941 fill_filespec(one, oid, oid_valid, mode);
5942 if (addremove != '-') {
5943 fill_filespec(two, oid, oid_valid, mode);
5944 two->dirty_submodule = dirty_submodule;
5945 }
5946
5947 diff_queue(&diff_queued_diff, one, two);
5948 if (!DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
5949 DIFF_OPT_SET(options, HAS_CHANGES);
5950 }
5951
5952 void diff_change(struct diff_options *options,
5953 unsigned old_mode, unsigned new_mode,
5954 const struct object_id *old_oid,
5955 const struct object_id *new_oid,
5956 int old_oid_valid, int new_oid_valid,
5957 const char *concatpath,
5958 unsigned old_dirty_submodule, unsigned new_dirty_submodule)
5959 {
5960 struct diff_filespec *one, *two;
5961 struct diff_filepair *p;
5962
5963 if (S_ISGITLINK(old_mode) && S_ISGITLINK(new_mode) &&
5964 is_submodule_ignored(concatpath, options))
5965 return;
5966
5967 if (DIFF_OPT_TST(options, REVERSE_DIFF)) {
5968 SWAP(old_mode, new_mode);
5969 SWAP(old_oid, new_oid);
5970 SWAP(old_oid_valid, new_oid_valid);
5971 SWAP(old_dirty_submodule, new_dirty_submodule);
5972 }
5973
5974 if (options->prefix &&
5975 strncmp(concatpath, options->prefix, options->prefix_length))
5976 return;
5977
5978 one = alloc_filespec(concatpath);
5979 two = alloc_filespec(concatpath);
5980 fill_filespec(one, old_oid, old_oid_valid, old_mode);
5981 fill_filespec(two, new_oid, new_oid_valid, new_mode);
5982 one->dirty_submodule = old_dirty_submodule;
5983 two->dirty_submodule = new_dirty_submodule;
5984 p = diff_queue(&diff_queued_diff, one, two);
5985
5986 if (DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
5987 return;
5988
5989 if (DIFF_OPT_TST(options, QUICK) && options->skip_stat_unmatch &&
5990 !diff_filespec_check_stat_unmatch(p))
5991 return;
5992
5993 DIFF_OPT_SET(options, HAS_CHANGES);
5994 }
5995
5996 struct diff_filepair *diff_unmerge(struct diff_options *options, const char *path)
5997 {
5998 struct diff_filepair *pair;
5999 struct diff_filespec *one, *two;
6000
6001 if (options->prefix &&
6002 strncmp(path, options->prefix, options->prefix_length))
6003 return NULL;
6004
6005 one = alloc_filespec(path);
6006 two = alloc_filespec(path);
6007 pair = diff_queue(&diff_queued_diff, one, two);
6008 pair->is_unmerged = 1;
6009 return pair;
6010 }
6011
6012 static char *run_textconv(const char *pgm, struct diff_filespec *spec,
6013 size_t *outsize)
6014 {
6015 struct diff_tempfile *temp;
6016 const char *argv[3];
6017 const char **arg = argv;
6018 struct child_process child = CHILD_PROCESS_INIT;
6019 struct strbuf buf = STRBUF_INIT;
6020 int err = 0;
6021
6022 temp = prepare_temp_file(spec->path, spec);
6023 *arg++ = pgm;
6024 *arg++ = temp->name;
6025 *arg = NULL;
6026
6027 child.use_shell = 1;
6028 child.argv = argv;
6029 child.out = -1;
6030 if (start_command(&child)) {
6031 remove_tempfile();
6032 return NULL;
6033 }
6034
6035 if (strbuf_read(&buf, child.out, 0) < 0)
6036 err = error("error reading from textconv command '%s'", pgm);
6037 close(child.out);
6038
6039 if (finish_command(&child) || err) {
6040 strbuf_release(&buf);
6041 remove_tempfile();
6042 return NULL;
6043 }
6044 remove_tempfile();
6045
6046 return strbuf_detach(&buf, outsize);
6047 }
6048
6049 size_t fill_textconv(struct userdiff_driver *driver,
6050 struct diff_filespec *df,
6051 char **outbuf)
6052 {
6053 size_t size;
6054
6055 if (!driver) {
6056 if (!DIFF_FILE_VALID(df)) {
6057 *outbuf = "";
6058 return 0;
6059 }
6060 if (diff_populate_filespec(df, 0))
6061 die("unable to read files to diff");
6062 *outbuf = df->data;
6063 return df->size;
6064 }
6065
6066 if (!driver->textconv)
6067 die("BUG: fill_textconv called with non-textconv driver");
6068
6069 if (driver->textconv_cache && df->oid_valid) {
6070 *outbuf = notes_cache_get(driver->textconv_cache,
6071 &df->oid,
6072 &size);
6073 if (*outbuf)
6074 return size;
6075 }
6076
6077 *outbuf = run_textconv(driver->textconv, df, &size);
6078 if (!*outbuf)
6079 die("unable to read files to diff");
6080
6081 if (driver->textconv_cache && df->oid_valid) {
6082 /* ignore errors, as we might be in a readonly repository */
6083 notes_cache_put(driver->textconv_cache, &df->oid, *outbuf,
6084 size);
6085 /*
6086 * we could save up changes and flush them all at the end,
6087 * but we would need an extra call after all diffing is done.
6088 * Since generating a cache entry is the slow path anyway,
6089 * this extra overhead probably isn't a big deal.
6090 */
6091 notes_cache_write(driver->textconv_cache);
6092 }
6093
6094 return size;
6095 }
6096
6097 int textconv_object(const char *path,
6098 unsigned mode,
6099 const struct object_id *oid,
6100 int oid_valid,
6101 char **buf,
6102 unsigned long *buf_size)
6103 {
6104 struct diff_filespec *df;
6105 struct userdiff_driver *textconv;
6106
6107 df = alloc_filespec(path);
6108 fill_filespec(df, oid, oid_valid, mode);
6109 textconv = get_textconv(df);
6110 if (!textconv) {
6111 free_filespec(df);
6112 return 0;
6113 }
6114
6115 *buf_size = fill_textconv(textconv, df, buf);
6116 free_filespec(df);
6117 return 1;
6118 }
6119
6120 void setup_diff_pager(struct diff_options *opt)
6121 {
6122 /*
6123 * If the user asked for our exit code, then either they want --quiet
6124 * or --exit-code. We should definitely not bother with a pager in the
6125 * former case, as we will generate no output. Since we still properly
6126 * report our exit code even when a pager is run, we _could_ run a
6127 * pager with --exit-code. But since we have not done so historically,
6128 * and because it is easy to find people oneline advising "git diff
6129 * --exit-code" in hooks and other scripts, we do not do so.
6130 */
6131 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
6132 check_pager_config("diff") != 0)
6133 setup_pager();
6134 }
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