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fsck: factor out msg_id_info[] lazy initialization code
[thirdparty/git.git] / diff.c
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 const char *color_diff_slots[] = {
73 [DIFF_CONTEXT] = "context",
74 [DIFF_METAINFO] = "meta",
75 [DIFF_FRAGINFO] = "frag",
76 [DIFF_FILE_OLD] = "old",
77 [DIFF_FILE_NEW] = "new",
78 [DIFF_COMMIT] = "commit",
79 [DIFF_WHITESPACE] = "whitespace",
80 [DIFF_FUNCINFO] = "func",
81 [DIFF_FILE_OLD_MOVED] = "oldMoved",
82 [DIFF_FILE_OLD_MOVED_ALT] = "oldMovedAlternative",
83 [DIFF_FILE_OLD_MOVED_DIM] = "oldMovedDimmed",
84 [DIFF_FILE_OLD_MOVED_ALT_DIM] = "oldMovedAlternativeDimmed",
85 [DIFF_FILE_NEW_MOVED] = "newMoved",
86 [DIFF_FILE_NEW_MOVED_ALT] = "newMovedAlternative",
87 [DIFF_FILE_NEW_MOVED_DIM] = "newMovedDimmed",
88 [DIFF_FILE_NEW_MOVED_ALT_DIM] = "newMovedAlternativeDimmed",
89 };
90
91 static NORETURN void die_want_option(const char *option_name)
92 {
93 die(_("option '%s' requires a value"), option_name);
94 }
95
96 static int parse_diff_color_slot(const char *var)
97 {
98 if (!strcasecmp(var, "plain"))
99 return DIFF_CONTEXT;
100 return LOOKUP_CONFIG(color_diff_slots, var);
101 }
102
103 static int parse_dirstat_params(struct diff_options *options, const char *params_string,
104 struct strbuf *errmsg)
105 {
106 char *params_copy = xstrdup(params_string);
107 struct string_list params = STRING_LIST_INIT_NODUP;
108 int ret = 0;
109 int i;
110
111 if (*params_copy)
112 string_list_split_in_place(&params, params_copy, ',', -1);
113 for (i = 0; i < params.nr; i++) {
114 const char *p = params.items[i].string;
115 if (!strcmp(p, "changes")) {
116 options->flags.dirstat_by_line = 0;
117 options->flags.dirstat_by_file = 0;
118 } else if (!strcmp(p, "lines")) {
119 options->flags.dirstat_by_line = 1;
120 options->flags.dirstat_by_file = 0;
121 } else if (!strcmp(p, "files")) {
122 options->flags.dirstat_by_line = 0;
123 options->flags.dirstat_by_file = 1;
124 } else if (!strcmp(p, "noncumulative")) {
125 options->flags.dirstat_cumulative = 0;
126 } else if (!strcmp(p, "cumulative")) {
127 options->flags.dirstat_cumulative = 1;
128 } else if (isdigit(*p)) {
129 char *end;
130 int permille = strtoul(p, &end, 10) * 10;
131 if (*end == '.' && isdigit(*++end)) {
132 /* only use first digit */
133 permille += *end - '0';
134 /* .. and ignore any further digits */
135 while (isdigit(*++end))
136 ; /* nothing */
137 }
138 if (!*end)
139 options->dirstat_permille = permille;
140 else {
141 strbuf_addf(errmsg, _(" Failed to parse dirstat cut-off percentage '%s'\n"),
142 p);
143 ret++;
144 }
145 } else {
146 strbuf_addf(errmsg, _(" Unknown dirstat parameter '%s'\n"), p);
147 ret++;
148 }
149
150 }
151 string_list_clear(&params, 0);
152 free(params_copy);
153 return ret;
154 }
155
156 static int parse_submodule_params(struct diff_options *options, const char *value)
157 {
158 if (!strcmp(value, "log"))
159 options->submodule_format = DIFF_SUBMODULE_LOG;
160 else if (!strcmp(value, "short"))
161 options->submodule_format = DIFF_SUBMODULE_SHORT;
162 else if (!strcmp(value, "diff"))
163 options->submodule_format = DIFF_SUBMODULE_INLINE_DIFF;
164 else
165 return -1;
166 return 0;
167 }
168
169 static int git_config_rename(const char *var, const char *value)
170 {
171 if (!value)
172 return DIFF_DETECT_RENAME;
173 if (!strcasecmp(value, "copies") || !strcasecmp(value, "copy"))
174 return DIFF_DETECT_COPY;
175 return git_config_bool(var,value) ? DIFF_DETECT_RENAME : 0;
176 }
177
178 long parse_algorithm_value(const char *value)
179 {
180 if (!value)
181 return -1;
182 else if (!strcasecmp(value, "myers") || !strcasecmp(value, "default"))
183 return 0;
184 else if (!strcasecmp(value, "minimal"))
185 return XDF_NEED_MINIMAL;
186 else if (!strcasecmp(value, "patience"))
187 return XDF_PATIENCE_DIFF;
188 else if (!strcasecmp(value, "histogram"))
189 return XDF_HISTOGRAM_DIFF;
190 return -1;
191 }
192
193 static int parse_one_token(const char **arg, const char *token)
194 {
195 const char *rest;
196 if (skip_prefix(*arg, token, &rest) && (!*rest || *rest == ',')) {
197 *arg = rest;
198 return 1;
199 }
200 return 0;
201 }
202
203 static int parse_ws_error_highlight(const char *arg)
204 {
205 const char *orig_arg = arg;
206 unsigned val = 0;
207
208 while (*arg) {
209 if (parse_one_token(&arg, "none"))
210 val = 0;
211 else if (parse_one_token(&arg, "default"))
212 val = WSEH_NEW;
213 else if (parse_one_token(&arg, "all"))
214 val = WSEH_NEW | WSEH_OLD | WSEH_CONTEXT;
215 else if (parse_one_token(&arg, "new"))
216 val |= WSEH_NEW;
217 else if (parse_one_token(&arg, "old"))
218 val |= WSEH_OLD;
219 else if (parse_one_token(&arg, "context"))
220 val |= WSEH_CONTEXT;
221 else {
222 return -1 - (int)(arg - orig_arg);
223 }
224 if (*arg)
225 arg++;
226 }
227 return val;
228 }
229
230 /*
231 * These are to give UI layer defaults.
232 * The core-level commands such as git-diff-files should
233 * never be affected by the setting of diff.renames
234 * the user happens to have in the configuration file.
235 */
236 void init_diff_ui_defaults(void)
237 {
238 diff_detect_rename_default = DIFF_DETECT_RENAME;
239 }
240
241 int git_diff_heuristic_config(const char *var, const char *value, void *cb)
242 {
243 if (!strcmp(var, "diff.indentheuristic"))
244 diff_indent_heuristic = git_config_bool(var, value);
245 return 0;
246 }
247
248 static int parse_color_moved(const char *arg)
249 {
250 switch (git_parse_maybe_bool(arg)) {
251 case 0:
252 return COLOR_MOVED_NO;
253 case 1:
254 return COLOR_MOVED_DEFAULT;
255 default:
256 break;
257 }
258
259 if (!strcmp(arg, "no"))
260 return COLOR_MOVED_NO;
261 else if (!strcmp(arg, "plain"))
262 return COLOR_MOVED_PLAIN;
263 else if (!strcmp(arg, "zebra"))
264 return COLOR_MOVED_ZEBRA;
265 else if (!strcmp(arg, "default"))
266 return COLOR_MOVED_DEFAULT;
267 else if (!strcmp(arg, "dimmed_zebra"))
268 return COLOR_MOVED_ZEBRA_DIM;
269 else
270 return error(_("color moved setting must be one of 'no', 'default', 'zebra', 'dimmed_zebra', 'plain'"));
271 }
272
273 int git_diff_ui_config(const char *var, const char *value, void *cb)
274 {
275 if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
276 diff_use_color_default = git_config_colorbool(var, value);
277 return 0;
278 }
279 if (!strcmp(var, "diff.colormoved")) {
280 int cm = parse_color_moved(value);
281 if (cm < 0)
282 return -1;
283 diff_color_moved_default = cm;
284 return 0;
285 }
286 if (!strcmp(var, "diff.context")) {
287 diff_context_default = git_config_int(var, value);
288 if (diff_context_default < 0)
289 return -1;
290 return 0;
291 }
292 if (!strcmp(var, "diff.interhunkcontext")) {
293 diff_interhunk_context_default = git_config_int(var, value);
294 if (diff_interhunk_context_default < 0)
295 return -1;
296 return 0;
297 }
298 if (!strcmp(var, "diff.renames")) {
299 diff_detect_rename_default = git_config_rename(var, value);
300 return 0;
301 }
302 if (!strcmp(var, "diff.autorefreshindex")) {
303 diff_auto_refresh_index = git_config_bool(var, value);
304 return 0;
305 }
306 if (!strcmp(var, "diff.mnemonicprefix")) {
307 diff_mnemonic_prefix = git_config_bool(var, value);
308 return 0;
309 }
310 if (!strcmp(var, "diff.noprefix")) {
311 diff_no_prefix = git_config_bool(var, value);
312 return 0;
313 }
314 if (!strcmp(var, "diff.statgraphwidth")) {
315 diff_stat_graph_width = git_config_int(var, value);
316 return 0;
317 }
318 if (!strcmp(var, "diff.external"))
319 return git_config_string(&external_diff_cmd_cfg, var, value);
320 if (!strcmp(var, "diff.wordregex"))
321 return git_config_string(&diff_word_regex_cfg, var, value);
322 if (!strcmp(var, "diff.orderfile"))
323 return git_config_pathname(&diff_order_file_cfg, var, value);
324
325 if (!strcmp(var, "diff.ignoresubmodules"))
326 handle_ignore_submodules_arg(&default_diff_options, value);
327
328 if (!strcmp(var, "diff.submodule")) {
329 if (parse_submodule_params(&default_diff_options, value))
330 warning(_("Unknown value for 'diff.submodule' config variable: '%s'"),
331 value);
332 return 0;
333 }
334
335 if (!strcmp(var, "diff.algorithm")) {
336 diff_algorithm = parse_algorithm_value(value);
337 if (diff_algorithm < 0)
338 return -1;
339 return 0;
340 }
341
342 if (!strcmp(var, "diff.wserrorhighlight")) {
343 int val = parse_ws_error_highlight(value);
344 if (val < 0)
345 return -1;
346 ws_error_highlight_default = val;
347 return 0;
348 }
349
350 if (git_color_config(var, value, cb) < 0)
351 return -1;
352
353 return git_diff_basic_config(var, value, cb);
354 }
355
356 int git_diff_basic_config(const char *var, const char *value, void *cb)
357 {
358 const char *name;
359
360 if (!strcmp(var, "diff.renamelimit")) {
361 diff_rename_limit_default = git_config_int(var, value);
362 return 0;
363 }
364
365 if (userdiff_config(var, value) < 0)
366 return -1;
367
368 if (skip_prefix(var, "diff.color.", &name) ||
369 skip_prefix(var, "color.diff.", &name)) {
370 int slot = parse_diff_color_slot(name);
371 if (slot < 0)
372 return 0;
373 if (!value)
374 return config_error_nonbool(var);
375 return color_parse(value, diff_colors[slot]);
376 }
377
378 /* like GNU diff's --suppress-blank-empty option */
379 if (!strcmp(var, "diff.suppressblankempty") ||
380 /* for backwards compatibility */
381 !strcmp(var, "diff.suppress-blank-empty")) {
382 diff_suppress_blank_empty = git_config_bool(var, value);
383 return 0;
384 }
385
386 if (!strcmp(var, "diff.dirstat")) {
387 struct strbuf errmsg = STRBUF_INIT;
388 default_diff_options.dirstat_permille = diff_dirstat_permille_default;
389 if (parse_dirstat_params(&default_diff_options, value, &errmsg))
390 warning(_("Found errors in 'diff.dirstat' config variable:\n%s"),
391 errmsg.buf);
392 strbuf_release(&errmsg);
393 diff_dirstat_permille_default = default_diff_options.dirstat_permille;
394 return 0;
395 }
396
397 if (git_diff_heuristic_config(var, value, cb) < 0)
398 return -1;
399
400 return git_default_config(var, value, cb);
401 }
402
403 static char *quote_two(const char *one, const char *two)
404 {
405 int need_one = quote_c_style(one, NULL, NULL, 1);
406 int need_two = quote_c_style(two, NULL, NULL, 1);
407 struct strbuf res = STRBUF_INIT;
408
409 if (need_one + need_two) {
410 strbuf_addch(&res, '"');
411 quote_c_style(one, &res, NULL, 1);
412 quote_c_style(two, &res, NULL, 1);
413 strbuf_addch(&res, '"');
414 } else {
415 strbuf_addstr(&res, one);
416 strbuf_addstr(&res, two);
417 }
418 return strbuf_detach(&res, NULL);
419 }
420
421 static const char *external_diff(void)
422 {
423 static const char *external_diff_cmd = NULL;
424 static int done_preparing = 0;
425
426 if (done_preparing)
427 return external_diff_cmd;
428 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
429 if (!external_diff_cmd)
430 external_diff_cmd = external_diff_cmd_cfg;
431 done_preparing = 1;
432 return external_diff_cmd;
433 }
434
435 /*
436 * Keep track of files used for diffing. Sometimes such an entry
437 * refers to a temporary file, sometimes to an existing file, and
438 * sometimes to "/dev/null".
439 */
440 static struct diff_tempfile {
441 /*
442 * filename external diff should read from, or NULL if this
443 * entry is currently not in use:
444 */
445 const char *name;
446
447 char hex[GIT_MAX_HEXSZ + 1];
448 char mode[10];
449
450 /*
451 * If this diff_tempfile instance refers to a temporary file,
452 * this tempfile object is used to manage its lifetime.
453 */
454 struct tempfile *tempfile;
455 } diff_temp[2];
456
457 struct emit_callback {
458 int color_diff;
459 unsigned ws_rule;
460 int blank_at_eof_in_preimage;
461 int blank_at_eof_in_postimage;
462 int lno_in_preimage;
463 int lno_in_postimage;
464 const char **label_path;
465 struct diff_words_data *diff_words;
466 struct diff_options *opt;
467 struct strbuf *header;
468 };
469
470 static int count_lines(const char *data, int size)
471 {
472 int count, ch, completely_empty = 1, nl_just_seen = 0;
473 count = 0;
474 while (0 < size--) {
475 ch = *data++;
476 if (ch == '\n') {
477 count++;
478 nl_just_seen = 1;
479 completely_empty = 0;
480 }
481 else {
482 nl_just_seen = 0;
483 completely_empty = 0;
484 }
485 }
486 if (completely_empty)
487 return 0;
488 if (!nl_just_seen)
489 count++; /* no trailing newline */
490 return count;
491 }
492
493 static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
494 {
495 if (!DIFF_FILE_VALID(one)) {
496 mf->ptr = (char *)""; /* does not matter */
497 mf->size = 0;
498 return 0;
499 }
500 else if (diff_populate_filespec(one, 0))
501 return -1;
502
503 mf->ptr = one->data;
504 mf->size = one->size;
505 return 0;
506 }
507
508 /* like fill_mmfile, but only for size, so we can avoid retrieving blob */
509 static unsigned long diff_filespec_size(struct diff_filespec *one)
510 {
511 if (!DIFF_FILE_VALID(one))
512 return 0;
513 diff_populate_filespec(one, CHECK_SIZE_ONLY);
514 return one->size;
515 }
516
517 static int count_trailing_blank(mmfile_t *mf, unsigned ws_rule)
518 {
519 char *ptr = mf->ptr;
520 long size = mf->size;
521 int cnt = 0;
522
523 if (!size)
524 return cnt;
525 ptr += size - 1; /* pointing at the very end */
526 if (*ptr != '\n')
527 ; /* incomplete line */
528 else
529 ptr--; /* skip the last LF */
530 while (mf->ptr < ptr) {
531 char *prev_eol;
532 for (prev_eol = ptr; mf->ptr <= prev_eol; prev_eol--)
533 if (*prev_eol == '\n')
534 break;
535 if (!ws_blank_line(prev_eol + 1, ptr - prev_eol, ws_rule))
536 break;
537 cnt++;
538 ptr = prev_eol - 1;
539 }
540 return cnt;
541 }
542
543 static void check_blank_at_eof(mmfile_t *mf1, mmfile_t *mf2,
544 struct emit_callback *ecbdata)
545 {
546 int l1, l2, at;
547 unsigned ws_rule = ecbdata->ws_rule;
548 l1 = count_trailing_blank(mf1, ws_rule);
549 l2 = count_trailing_blank(mf2, ws_rule);
550 if (l2 <= l1) {
551 ecbdata->blank_at_eof_in_preimage = 0;
552 ecbdata->blank_at_eof_in_postimage = 0;
553 return;
554 }
555 at = count_lines(mf1->ptr, mf1->size);
556 ecbdata->blank_at_eof_in_preimage = (at - l1) + 1;
557
558 at = count_lines(mf2->ptr, mf2->size);
559 ecbdata->blank_at_eof_in_postimage = (at - l2) + 1;
560 }
561
562 static void emit_line_0(struct diff_options *o, const char *set, const char *reset,
563 int first, const char *line, int len)
564 {
565 int has_trailing_newline, has_trailing_carriage_return;
566 int nofirst;
567 FILE *file = o->file;
568
569 fputs(diff_line_prefix(o), file);
570
571 if (len == 0) {
572 has_trailing_newline = (first == '\n');
573 has_trailing_carriage_return = (!has_trailing_newline &&
574 (first == '\r'));
575 nofirst = has_trailing_newline || has_trailing_carriage_return;
576 } else {
577 has_trailing_newline = (len > 0 && line[len-1] == '\n');
578 if (has_trailing_newline)
579 len--;
580 has_trailing_carriage_return = (len > 0 && line[len-1] == '\r');
581 if (has_trailing_carriage_return)
582 len--;
583 nofirst = 0;
584 }
585
586 if (len || !nofirst) {
587 fputs(set, file);
588 if (!nofirst)
589 fputc(first, file);
590 fwrite(line, len, 1, file);
591 fputs(reset, file);
592 }
593 if (has_trailing_carriage_return)
594 fputc('\r', file);
595 if (has_trailing_newline)
596 fputc('\n', file);
597 }
598
599 static void emit_line(struct diff_options *o, const char *set, const char *reset,
600 const char *line, int len)
601 {
602 emit_line_0(o, set, reset, line[0], line+1, len-1);
603 }
604
605 enum diff_symbol {
606 DIFF_SYMBOL_BINARY_DIFF_HEADER,
607 DIFF_SYMBOL_BINARY_DIFF_HEADER_DELTA,
608 DIFF_SYMBOL_BINARY_DIFF_HEADER_LITERAL,
609 DIFF_SYMBOL_BINARY_DIFF_BODY,
610 DIFF_SYMBOL_BINARY_DIFF_FOOTER,
611 DIFF_SYMBOL_STATS_SUMMARY_NO_FILES,
612 DIFF_SYMBOL_STATS_SUMMARY_ABBREV,
613 DIFF_SYMBOL_STATS_SUMMARY_INSERTS_DELETES,
614 DIFF_SYMBOL_STATS_LINE,
615 DIFF_SYMBOL_WORD_DIFF,
616 DIFF_SYMBOL_STAT_SEP,
617 DIFF_SYMBOL_SUMMARY,
618 DIFF_SYMBOL_SUBMODULE_ADD,
619 DIFF_SYMBOL_SUBMODULE_DEL,
620 DIFF_SYMBOL_SUBMODULE_UNTRACKED,
621 DIFF_SYMBOL_SUBMODULE_MODIFIED,
622 DIFF_SYMBOL_SUBMODULE_HEADER,
623 DIFF_SYMBOL_SUBMODULE_ERROR,
624 DIFF_SYMBOL_SUBMODULE_PIPETHROUGH,
625 DIFF_SYMBOL_REWRITE_DIFF,
626 DIFF_SYMBOL_BINARY_FILES,
627 DIFF_SYMBOL_HEADER,
628 DIFF_SYMBOL_FILEPAIR_PLUS,
629 DIFF_SYMBOL_FILEPAIR_MINUS,
630 DIFF_SYMBOL_WORDS_PORCELAIN,
631 DIFF_SYMBOL_WORDS,
632 DIFF_SYMBOL_CONTEXT,
633 DIFF_SYMBOL_CONTEXT_INCOMPLETE,
634 DIFF_SYMBOL_PLUS,
635 DIFF_SYMBOL_MINUS,
636 DIFF_SYMBOL_NO_LF_EOF,
637 DIFF_SYMBOL_CONTEXT_FRAGINFO,
638 DIFF_SYMBOL_CONTEXT_MARKER,
639 DIFF_SYMBOL_SEPARATOR
640 };
641 /*
642 * Flags for content lines:
643 * 0..12 are whitespace rules
644 * 13-15 are WSEH_NEW | WSEH_OLD | WSEH_CONTEXT
645 * 16 is marking if the line is blank at EOF
646 */
647 #define DIFF_SYMBOL_CONTENT_BLANK_LINE_EOF (1<<16)
648 #define DIFF_SYMBOL_MOVED_LINE (1<<17)
649 #define DIFF_SYMBOL_MOVED_LINE_ALT (1<<18)
650 #define DIFF_SYMBOL_MOVED_LINE_UNINTERESTING (1<<19)
651 #define DIFF_SYMBOL_CONTENT_WS_MASK (WSEH_NEW | WSEH_OLD | WSEH_CONTEXT | WS_RULE_MASK)
652
653 /*
654 * This struct is used when we need to buffer the output of the diff output.
655 *
656 * NEEDSWORK: Instead of storing a copy of the line, add an offset pointer
657 * into the pre/post image file. This pointer could be a union with the
658 * line pointer. By storing an offset into the file instead of the literal line,
659 * we can decrease the memory footprint for the buffered output. At first we
660 * may want to only have indirection for the content lines, but we could also
661 * enhance the state for emitting prefabricated lines, e.g. the similarity
662 * score line or hunk/file headers would only need to store a number or path
663 * and then the output can be constructed later on depending on state.
664 */
665 struct emitted_diff_symbol {
666 const char *line;
667 int len;
668 int flags;
669 enum diff_symbol s;
670 };
671 #define EMITTED_DIFF_SYMBOL_INIT {NULL}
672
673 struct emitted_diff_symbols {
674 struct emitted_diff_symbol *buf;
675 int nr, alloc;
676 };
677 #define EMITTED_DIFF_SYMBOLS_INIT {NULL, 0, 0}
678
679 static void append_emitted_diff_symbol(struct diff_options *o,
680 struct emitted_diff_symbol *e)
681 {
682 struct emitted_diff_symbol *f;
683
684 ALLOC_GROW(o->emitted_symbols->buf,
685 o->emitted_symbols->nr + 1,
686 o->emitted_symbols->alloc);
687 f = &o->emitted_symbols->buf[o->emitted_symbols->nr++];
688
689 memcpy(f, e, sizeof(struct emitted_diff_symbol));
690 f->line = e->line ? xmemdupz(e->line, e->len) : NULL;
691 }
692
693 struct moved_entry {
694 struct hashmap_entry ent;
695 const struct emitted_diff_symbol *es;
696 struct moved_entry *next_line;
697 };
698
699 static int moved_entry_cmp(const struct diff_options *diffopt,
700 const struct moved_entry *a,
701 const struct moved_entry *b,
702 const void *keydata)
703 {
704 return !xdiff_compare_lines(a->es->line, a->es->len,
705 b->es->line, b->es->len,
706 diffopt->xdl_opts);
707 }
708
709 static struct moved_entry *prepare_entry(struct diff_options *o,
710 int line_no)
711 {
712 struct moved_entry *ret = xmalloc(sizeof(*ret));
713 struct emitted_diff_symbol *l = &o->emitted_symbols->buf[line_no];
714
715 ret->ent.hash = xdiff_hash_string(l->line, l->len, o->xdl_opts);
716 ret->es = l;
717 ret->next_line = NULL;
718
719 return ret;
720 }
721
722 static void add_lines_to_move_detection(struct diff_options *o,
723 struct hashmap *add_lines,
724 struct hashmap *del_lines)
725 {
726 struct moved_entry *prev_line = NULL;
727
728 int n;
729 for (n = 0; n < o->emitted_symbols->nr; n++) {
730 struct hashmap *hm;
731 struct moved_entry *key;
732
733 switch (o->emitted_symbols->buf[n].s) {
734 case DIFF_SYMBOL_PLUS:
735 hm = add_lines;
736 break;
737 case DIFF_SYMBOL_MINUS:
738 hm = del_lines;
739 break;
740 default:
741 prev_line = NULL;
742 continue;
743 }
744
745 key = prepare_entry(o, n);
746 if (prev_line && prev_line->es->s == o->emitted_symbols->buf[n].s)
747 prev_line->next_line = key;
748
749 hashmap_add(hm, key);
750 prev_line = key;
751 }
752 }
753
754 static int shrink_potential_moved_blocks(struct moved_entry **pmb,
755 int pmb_nr)
756 {
757 int lp, rp;
758
759 /* Shrink the set of potential block to the remaining running */
760 for (lp = 0, rp = pmb_nr - 1; lp <= rp;) {
761 while (lp < pmb_nr && pmb[lp])
762 lp++;
763 /* lp points at the first NULL now */
764
765 while (rp > -1 && !pmb[rp])
766 rp--;
767 /* rp points at the last non-NULL */
768
769 if (lp < pmb_nr && rp > -1 && lp < rp) {
770 pmb[lp] = pmb[rp];
771 pmb[rp] = NULL;
772 rp--;
773 lp++;
774 }
775 }
776
777 /* Remember the number of running sets */
778 return rp + 1;
779 }
780
781 /*
782 * If o->color_moved is COLOR_MOVED_PLAIN, this function does nothing.
783 *
784 * Otherwise, if the last block has fewer alphanumeric characters than
785 * COLOR_MOVED_MIN_ALNUM_COUNT, unset DIFF_SYMBOL_MOVED_LINE on all lines in
786 * that block.
787 *
788 * The last block consists of the (n - block_length)'th line up to but not
789 * including the nth line.
790 *
791 * NEEDSWORK: This uses the same heuristic as blame_entry_score() in blame.c.
792 * Think of a way to unify them.
793 */
794 static void adjust_last_block(struct diff_options *o, int n, int block_length)
795 {
796 int i, alnum_count = 0;
797 if (o->color_moved == COLOR_MOVED_PLAIN)
798 return;
799 for (i = 1; i < block_length + 1; i++) {
800 const char *c = o->emitted_symbols->buf[n - i].line;
801 for (; *c; c++) {
802 if (!isalnum(*c))
803 continue;
804 alnum_count++;
805 if (alnum_count >= COLOR_MOVED_MIN_ALNUM_COUNT)
806 return;
807 }
808 }
809 for (i = 1; i < block_length + 1; i++)
810 o->emitted_symbols->buf[n - i].flags &= ~DIFF_SYMBOL_MOVED_LINE;
811 }
812
813 /* Find blocks of moved code, delegate actual coloring decision to helper */
814 static void mark_color_as_moved(struct diff_options *o,
815 struct hashmap *add_lines,
816 struct hashmap *del_lines)
817 {
818 struct moved_entry **pmb = NULL; /* potentially moved blocks */
819 int pmb_nr = 0, pmb_alloc = 0;
820 int n, flipped_block = 1, block_length = 0;
821
822
823 for (n = 0; n < o->emitted_symbols->nr; n++) {
824 struct hashmap *hm = NULL;
825 struct moved_entry *key;
826 struct moved_entry *match = NULL;
827 struct emitted_diff_symbol *l = &o->emitted_symbols->buf[n];
828 int i;
829
830 switch (l->s) {
831 case DIFF_SYMBOL_PLUS:
832 hm = del_lines;
833 key = prepare_entry(o, n);
834 match = hashmap_get(hm, key, o);
835 free(key);
836 break;
837 case DIFF_SYMBOL_MINUS:
838 hm = add_lines;
839 key = prepare_entry(o, n);
840 match = hashmap_get(hm, key, o);
841 free(key);
842 break;
843 default:
844 flipped_block = 1;
845 }
846
847 if (!match) {
848 adjust_last_block(o, n, block_length);
849 pmb_nr = 0;
850 block_length = 0;
851 continue;
852 }
853
854 l->flags |= DIFF_SYMBOL_MOVED_LINE;
855
856 if (o->color_moved == COLOR_MOVED_PLAIN)
857 continue;
858
859 /* Check any potential block runs, advance each or nullify */
860 for (i = 0; i < pmb_nr; i++) {
861 struct moved_entry *p = pmb[i];
862 struct moved_entry *pnext = (p && p->next_line) ?
863 p->next_line : NULL;
864 if (pnext && !hm->cmpfn(o, pnext, match, NULL)) {
865 pmb[i] = p->next_line;
866 } else {
867 pmb[i] = NULL;
868 }
869 }
870
871 pmb_nr = shrink_potential_moved_blocks(pmb, pmb_nr);
872
873 if (pmb_nr == 0) {
874 /*
875 * The current line is the start of a new block.
876 * Setup the set of potential blocks.
877 */
878 for (; match; match = hashmap_get_next(hm, match)) {
879 ALLOC_GROW(pmb, pmb_nr + 1, pmb_alloc);
880 pmb[pmb_nr++] = match;
881 }
882
883 flipped_block = (flipped_block + 1) % 2;
884
885 adjust_last_block(o, n, block_length);
886 block_length = 0;
887 }
888
889 block_length++;
890
891 if (flipped_block)
892 l->flags |= DIFF_SYMBOL_MOVED_LINE_ALT;
893 }
894 adjust_last_block(o, n, block_length);
895
896 free(pmb);
897 }
898
899 #define DIFF_SYMBOL_MOVED_LINE_ZEBRA_MASK \
900 (DIFF_SYMBOL_MOVED_LINE | DIFF_SYMBOL_MOVED_LINE_ALT)
901 static void dim_moved_lines(struct diff_options *o)
902 {
903 int n;
904 for (n = 0; n < o->emitted_symbols->nr; n++) {
905 struct emitted_diff_symbol *prev = (n != 0) ?
906 &o->emitted_symbols->buf[n - 1] : NULL;
907 struct emitted_diff_symbol *l = &o->emitted_symbols->buf[n];
908 struct emitted_diff_symbol *next =
909 (n < o->emitted_symbols->nr - 1) ?
910 &o->emitted_symbols->buf[n + 1] : NULL;
911
912 /* Not a plus or minus line? */
913 if (l->s != DIFF_SYMBOL_PLUS && l->s != DIFF_SYMBOL_MINUS)
914 continue;
915
916 /* Not a moved line? */
917 if (!(l->flags & DIFF_SYMBOL_MOVED_LINE))
918 continue;
919
920 /*
921 * If prev or next are not a plus or minus line,
922 * pretend they don't exist
923 */
924 if (prev && prev->s != DIFF_SYMBOL_PLUS &&
925 prev->s != DIFF_SYMBOL_MINUS)
926 prev = NULL;
927 if (next && next->s != DIFF_SYMBOL_PLUS &&
928 next->s != DIFF_SYMBOL_MINUS)
929 next = NULL;
930
931 /* Inside a block? */
932 if ((prev &&
933 (prev->flags & DIFF_SYMBOL_MOVED_LINE_ZEBRA_MASK) ==
934 (l->flags & DIFF_SYMBOL_MOVED_LINE_ZEBRA_MASK)) &&
935 (next &&
936 (next->flags & DIFF_SYMBOL_MOVED_LINE_ZEBRA_MASK) ==
937 (l->flags & DIFF_SYMBOL_MOVED_LINE_ZEBRA_MASK))) {
938 l->flags |= DIFF_SYMBOL_MOVED_LINE_UNINTERESTING;
939 continue;
940 }
941
942 /* Check if we are at an interesting bound: */
943 if (prev && (prev->flags & DIFF_SYMBOL_MOVED_LINE) &&
944 (prev->flags & DIFF_SYMBOL_MOVED_LINE_ALT) !=
945 (l->flags & DIFF_SYMBOL_MOVED_LINE_ALT))
946 continue;
947 if (next && (next->flags & DIFF_SYMBOL_MOVED_LINE) &&
948 (next->flags & DIFF_SYMBOL_MOVED_LINE_ALT) !=
949 (l->flags & DIFF_SYMBOL_MOVED_LINE_ALT))
950 continue;
951
952 /*
953 * The boundary to prev and next are not interesting,
954 * so this line is not interesting as a whole
955 */
956 l->flags |= DIFF_SYMBOL_MOVED_LINE_UNINTERESTING;
957 }
958 }
959
960 static void emit_line_ws_markup(struct diff_options *o,
961 const char *set, const char *reset,
962 const char *line, int len, char sign,
963 unsigned ws_rule, int blank_at_eof)
964 {
965 const char *ws = NULL;
966
967 if (o->ws_error_highlight & ws_rule) {
968 ws = diff_get_color_opt(o, DIFF_WHITESPACE);
969 if (!*ws)
970 ws = NULL;
971 }
972
973 if (!ws)
974 emit_line_0(o, set, reset, sign, line, len);
975 else if (blank_at_eof)
976 /* Blank line at EOF - paint '+' as well */
977 emit_line_0(o, ws, reset, sign, line, len);
978 else {
979 /* Emit just the prefix, then the rest. */
980 emit_line_0(o, set, reset, sign, "", 0);
981 ws_check_emit(line, len, ws_rule,
982 o->file, set, reset, ws);
983 }
984 }
985
986 static void emit_diff_symbol_from_struct(struct diff_options *o,
987 struct emitted_diff_symbol *eds)
988 {
989 static const char *nneof = " No newline at end of file\n";
990 const char *context, *reset, *set, *meta, *fraginfo;
991 struct strbuf sb = STRBUF_INIT;
992
993 enum diff_symbol s = eds->s;
994 const char *line = eds->line;
995 int len = eds->len;
996 unsigned flags = eds->flags;
997
998 switch (s) {
999 case DIFF_SYMBOL_NO_LF_EOF:
1000 context = diff_get_color_opt(o, DIFF_CONTEXT);
1001 reset = diff_get_color_opt(o, DIFF_RESET);
1002 putc('\n', o->file);
1003 emit_line_0(o, context, reset, '\\',
1004 nneof, strlen(nneof));
1005 break;
1006 case DIFF_SYMBOL_SUBMODULE_HEADER:
1007 case DIFF_SYMBOL_SUBMODULE_ERROR:
1008 case DIFF_SYMBOL_SUBMODULE_PIPETHROUGH:
1009 case DIFF_SYMBOL_STATS_SUMMARY_INSERTS_DELETES:
1010 case DIFF_SYMBOL_SUMMARY:
1011 case DIFF_SYMBOL_STATS_LINE:
1012 case DIFF_SYMBOL_BINARY_DIFF_BODY:
1013 case DIFF_SYMBOL_CONTEXT_FRAGINFO:
1014 emit_line(o, "", "", line, len);
1015 break;
1016 case DIFF_SYMBOL_CONTEXT_INCOMPLETE:
1017 case DIFF_SYMBOL_CONTEXT_MARKER:
1018 context = diff_get_color_opt(o, DIFF_CONTEXT);
1019 reset = diff_get_color_opt(o, DIFF_RESET);
1020 emit_line(o, context, reset, line, len);
1021 break;
1022 case DIFF_SYMBOL_SEPARATOR:
1023 fprintf(o->file, "%s%c",
1024 diff_line_prefix(o),
1025 o->line_termination);
1026 break;
1027 case DIFF_SYMBOL_CONTEXT:
1028 set = diff_get_color_opt(o, DIFF_CONTEXT);
1029 reset = diff_get_color_opt(o, DIFF_RESET);
1030 emit_line_ws_markup(o, set, reset, line, len, ' ',
1031 flags & (DIFF_SYMBOL_CONTENT_WS_MASK), 0);
1032 break;
1033 case DIFF_SYMBOL_PLUS:
1034 switch (flags & (DIFF_SYMBOL_MOVED_LINE |
1035 DIFF_SYMBOL_MOVED_LINE_ALT |
1036 DIFF_SYMBOL_MOVED_LINE_UNINTERESTING)) {
1037 case DIFF_SYMBOL_MOVED_LINE |
1038 DIFF_SYMBOL_MOVED_LINE_ALT |
1039 DIFF_SYMBOL_MOVED_LINE_UNINTERESTING:
1040 set = diff_get_color_opt(o, DIFF_FILE_NEW_MOVED_ALT_DIM);
1041 break;
1042 case DIFF_SYMBOL_MOVED_LINE |
1043 DIFF_SYMBOL_MOVED_LINE_ALT:
1044 set = diff_get_color_opt(o, DIFF_FILE_NEW_MOVED_ALT);
1045 break;
1046 case DIFF_SYMBOL_MOVED_LINE |
1047 DIFF_SYMBOL_MOVED_LINE_UNINTERESTING:
1048 set = diff_get_color_opt(o, DIFF_FILE_NEW_MOVED_DIM);
1049 break;
1050 case DIFF_SYMBOL_MOVED_LINE:
1051 set = diff_get_color_opt(o, DIFF_FILE_NEW_MOVED);
1052 break;
1053 default:
1054 set = diff_get_color_opt(o, DIFF_FILE_NEW);
1055 }
1056 reset = diff_get_color_opt(o, DIFF_RESET);
1057 emit_line_ws_markup(o, set, reset, line, len, '+',
1058 flags & DIFF_SYMBOL_CONTENT_WS_MASK,
1059 flags & DIFF_SYMBOL_CONTENT_BLANK_LINE_EOF);
1060 break;
1061 case DIFF_SYMBOL_MINUS:
1062 switch (flags & (DIFF_SYMBOL_MOVED_LINE |
1063 DIFF_SYMBOL_MOVED_LINE_ALT |
1064 DIFF_SYMBOL_MOVED_LINE_UNINTERESTING)) {
1065 case DIFF_SYMBOL_MOVED_LINE |
1066 DIFF_SYMBOL_MOVED_LINE_ALT |
1067 DIFF_SYMBOL_MOVED_LINE_UNINTERESTING:
1068 set = diff_get_color_opt(o, DIFF_FILE_OLD_MOVED_ALT_DIM);
1069 break;
1070 case DIFF_SYMBOL_MOVED_LINE |
1071 DIFF_SYMBOL_MOVED_LINE_ALT:
1072 set = diff_get_color_opt(o, DIFF_FILE_OLD_MOVED_ALT);
1073 break;
1074 case DIFF_SYMBOL_MOVED_LINE |
1075 DIFF_SYMBOL_MOVED_LINE_UNINTERESTING:
1076 set = diff_get_color_opt(o, DIFF_FILE_OLD_MOVED_DIM);
1077 break;
1078 case DIFF_SYMBOL_MOVED_LINE:
1079 set = diff_get_color_opt(o, DIFF_FILE_OLD_MOVED);
1080 break;
1081 default:
1082 set = diff_get_color_opt(o, DIFF_FILE_OLD);
1083 }
1084 reset = diff_get_color_opt(o, DIFF_RESET);
1085 emit_line_ws_markup(o, set, reset, line, len, '-',
1086 flags & DIFF_SYMBOL_CONTENT_WS_MASK, 0);
1087 break;
1088 case DIFF_SYMBOL_WORDS_PORCELAIN:
1089 context = diff_get_color_opt(o, DIFF_CONTEXT);
1090 reset = diff_get_color_opt(o, DIFF_RESET);
1091 emit_line(o, context, reset, line, len);
1092 fputs("~\n", o->file);
1093 break;
1094 case DIFF_SYMBOL_WORDS:
1095 context = diff_get_color_opt(o, DIFF_CONTEXT);
1096 reset = diff_get_color_opt(o, DIFF_RESET);
1097 /*
1098 * Skip the prefix character, if any. With
1099 * diff_suppress_blank_empty, there may be
1100 * none.
1101 */
1102 if (line[0] != '\n') {
1103 line++;
1104 len--;
1105 }
1106 emit_line(o, context, reset, line, len);
1107 break;
1108 case DIFF_SYMBOL_FILEPAIR_PLUS:
1109 meta = diff_get_color_opt(o, DIFF_METAINFO);
1110 reset = diff_get_color_opt(o, DIFF_RESET);
1111 fprintf(o->file, "%s%s+++ %s%s%s\n", diff_line_prefix(o), meta,
1112 line, reset,
1113 strchr(line, ' ') ? "\t" : "");
1114 break;
1115 case DIFF_SYMBOL_FILEPAIR_MINUS:
1116 meta = diff_get_color_opt(o, DIFF_METAINFO);
1117 reset = diff_get_color_opt(o, DIFF_RESET);
1118 fprintf(o->file, "%s%s--- %s%s%s\n", diff_line_prefix(o), meta,
1119 line, reset,
1120 strchr(line, ' ') ? "\t" : "");
1121 break;
1122 case DIFF_SYMBOL_BINARY_FILES:
1123 case DIFF_SYMBOL_HEADER:
1124 fprintf(o->file, "%s", line);
1125 break;
1126 case DIFF_SYMBOL_BINARY_DIFF_HEADER:
1127 fprintf(o->file, "%sGIT binary patch\n", diff_line_prefix(o));
1128 break;
1129 case DIFF_SYMBOL_BINARY_DIFF_HEADER_DELTA:
1130 fprintf(o->file, "%sdelta %s\n", diff_line_prefix(o), line);
1131 break;
1132 case DIFF_SYMBOL_BINARY_DIFF_HEADER_LITERAL:
1133 fprintf(o->file, "%sliteral %s\n", diff_line_prefix(o), line);
1134 break;
1135 case DIFF_SYMBOL_BINARY_DIFF_FOOTER:
1136 fputs(diff_line_prefix(o), o->file);
1137 fputc('\n', o->file);
1138 break;
1139 case DIFF_SYMBOL_REWRITE_DIFF:
1140 fraginfo = diff_get_color(o->use_color, DIFF_FRAGINFO);
1141 reset = diff_get_color_opt(o, DIFF_RESET);
1142 emit_line(o, fraginfo, reset, line, len);
1143 break;
1144 case DIFF_SYMBOL_SUBMODULE_ADD:
1145 set = diff_get_color_opt(o, DIFF_FILE_NEW);
1146 reset = diff_get_color_opt(o, DIFF_RESET);
1147 emit_line(o, set, reset, line, len);
1148 break;
1149 case DIFF_SYMBOL_SUBMODULE_DEL:
1150 set = diff_get_color_opt(o, DIFF_FILE_OLD);
1151 reset = diff_get_color_opt(o, DIFF_RESET);
1152 emit_line(o, set, reset, line, len);
1153 break;
1154 case DIFF_SYMBOL_SUBMODULE_UNTRACKED:
1155 fprintf(o->file, "%sSubmodule %s contains untracked content\n",
1156 diff_line_prefix(o), line);
1157 break;
1158 case DIFF_SYMBOL_SUBMODULE_MODIFIED:
1159 fprintf(o->file, "%sSubmodule %s contains modified content\n",
1160 diff_line_prefix(o), line);
1161 break;
1162 case DIFF_SYMBOL_STATS_SUMMARY_NO_FILES:
1163 emit_line(o, "", "", " 0 files changed\n",
1164 strlen(" 0 files changed\n"));
1165 break;
1166 case DIFF_SYMBOL_STATS_SUMMARY_ABBREV:
1167 emit_line(o, "", "", " ...\n", strlen(" ...\n"));
1168 break;
1169 case DIFF_SYMBOL_WORD_DIFF:
1170 fprintf(o->file, "%.*s", len, line);
1171 break;
1172 case DIFF_SYMBOL_STAT_SEP:
1173 fputs(o->stat_sep, o->file);
1174 break;
1175 default:
1176 die("BUG: unknown diff symbol");
1177 }
1178 strbuf_release(&sb);
1179 }
1180
1181 static void emit_diff_symbol(struct diff_options *o, enum diff_symbol s,
1182 const char *line, int len, unsigned flags)
1183 {
1184 struct emitted_diff_symbol e = {line, len, flags, s};
1185
1186 if (o->emitted_symbols)
1187 append_emitted_diff_symbol(o, &e);
1188 else
1189 emit_diff_symbol_from_struct(o, &e);
1190 }
1191
1192 void diff_emit_submodule_del(struct diff_options *o, const char *line)
1193 {
1194 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_DEL, line, strlen(line), 0);
1195 }
1196
1197 void diff_emit_submodule_add(struct diff_options *o, const char *line)
1198 {
1199 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_ADD, line, strlen(line), 0);
1200 }
1201
1202 void diff_emit_submodule_untracked(struct diff_options *o, const char *path)
1203 {
1204 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_UNTRACKED,
1205 path, strlen(path), 0);
1206 }
1207
1208 void diff_emit_submodule_modified(struct diff_options *o, const char *path)
1209 {
1210 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_MODIFIED,
1211 path, strlen(path), 0);
1212 }
1213
1214 void diff_emit_submodule_header(struct diff_options *o, const char *header)
1215 {
1216 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_HEADER,
1217 header, strlen(header), 0);
1218 }
1219
1220 void diff_emit_submodule_error(struct diff_options *o, const char *err)
1221 {
1222 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_ERROR, err, strlen(err), 0);
1223 }
1224
1225 void diff_emit_submodule_pipethrough(struct diff_options *o,
1226 const char *line, int len)
1227 {
1228 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_PIPETHROUGH, line, len, 0);
1229 }
1230
1231 static int new_blank_line_at_eof(struct emit_callback *ecbdata, const char *line, int len)
1232 {
1233 if (!((ecbdata->ws_rule & WS_BLANK_AT_EOF) &&
1234 ecbdata->blank_at_eof_in_preimage &&
1235 ecbdata->blank_at_eof_in_postimage &&
1236 ecbdata->blank_at_eof_in_preimage <= ecbdata->lno_in_preimage &&
1237 ecbdata->blank_at_eof_in_postimage <= ecbdata->lno_in_postimage))
1238 return 0;
1239 return ws_blank_line(line, len, ecbdata->ws_rule);
1240 }
1241
1242 static void emit_add_line(const char *reset,
1243 struct emit_callback *ecbdata,
1244 const char *line, int len)
1245 {
1246 unsigned flags = WSEH_NEW | ecbdata->ws_rule;
1247 if (new_blank_line_at_eof(ecbdata, line, len))
1248 flags |= DIFF_SYMBOL_CONTENT_BLANK_LINE_EOF;
1249
1250 emit_diff_symbol(ecbdata->opt, DIFF_SYMBOL_PLUS, line, len, flags);
1251 }
1252
1253 static void emit_del_line(const char *reset,
1254 struct emit_callback *ecbdata,
1255 const char *line, int len)
1256 {
1257 unsigned flags = WSEH_OLD | ecbdata->ws_rule;
1258 emit_diff_symbol(ecbdata->opt, DIFF_SYMBOL_MINUS, line, len, flags);
1259 }
1260
1261 static void emit_context_line(const char *reset,
1262 struct emit_callback *ecbdata,
1263 const char *line, int len)
1264 {
1265 unsigned flags = WSEH_CONTEXT | ecbdata->ws_rule;
1266 emit_diff_symbol(ecbdata->opt, DIFF_SYMBOL_CONTEXT, line, len, flags);
1267 }
1268
1269 static void emit_hunk_header(struct emit_callback *ecbdata,
1270 const char *line, int len)
1271 {
1272 const char *context = diff_get_color(ecbdata->color_diff, DIFF_CONTEXT);
1273 const char *frag = diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO);
1274 const char *func = diff_get_color(ecbdata->color_diff, DIFF_FUNCINFO);
1275 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
1276 static const char atat[2] = { '@', '@' };
1277 const char *cp, *ep;
1278 struct strbuf msgbuf = STRBUF_INIT;
1279 int org_len = len;
1280 int i = 1;
1281
1282 /*
1283 * As a hunk header must begin with "@@ -<old>, +<new> @@",
1284 * it always is at least 10 bytes long.
1285 */
1286 if (len < 10 ||
1287 memcmp(line, atat, 2) ||
1288 !(ep = memmem(line + 2, len - 2, atat, 2))) {
1289 emit_diff_symbol(ecbdata->opt,
1290 DIFF_SYMBOL_CONTEXT_MARKER, line, len, 0);
1291 return;
1292 }
1293 ep += 2; /* skip over @@ */
1294
1295 /* The hunk header in fraginfo color */
1296 strbuf_addstr(&msgbuf, frag);
1297 strbuf_add(&msgbuf, line, ep - line);
1298 strbuf_addstr(&msgbuf, reset);
1299
1300 /*
1301 * trailing "\r\n"
1302 */
1303 for ( ; i < 3; i++)
1304 if (line[len - i] == '\r' || line[len - i] == '\n')
1305 len--;
1306
1307 /* blank before the func header */
1308 for (cp = ep; ep - line < len; ep++)
1309 if (*ep != ' ' && *ep != '\t')
1310 break;
1311 if (ep != cp) {
1312 strbuf_addstr(&msgbuf, context);
1313 strbuf_add(&msgbuf, cp, ep - cp);
1314 strbuf_addstr(&msgbuf, reset);
1315 }
1316
1317 if (ep < line + len) {
1318 strbuf_addstr(&msgbuf, func);
1319 strbuf_add(&msgbuf, ep, line + len - ep);
1320 strbuf_addstr(&msgbuf, reset);
1321 }
1322
1323 strbuf_add(&msgbuf, line + len, org_len - len);
1324 strbuf_complete_line(&msgbuf);
1325 emit_diff_symbol(ecbdata->opt,
1326 DIFF_SYMBOL_CONTEXT_FRAGINFO, msgbuf.buf, msgbuf.len, 0);
1327 strbuf_release(&msgbuf);
1328 }
1329
1330 static struct diff_tempfile *claim_diff_tempfile(void) {
1331 int i;
1332 for (i = 0; i < ARRAY_SIZE(diff_temp); i++)
1333 if (!diff_temp[i].name)
1334 return diff_temp + i;
1335 die("BUG: diff is failing to clean up its tempfiles");
1336 }
1337
1338 static void remove_tempfile(void)
1339 {
1340 int i;
1341 for (i = 0; i < ARRAY_SIZE(diff_temp); i++) {
1342 if (is_tempfile_active(diff_temp[i].tempfile))
1343 delete_tempfile(&diff_temp[i].tempfile);
1344 diff_temp[i].name = NULL;
1345 }
1346 }
1347
1348 static void add_line_count(struct strbuf *out, int count)
1349 {
1350 switch (count) {
1351 case 0:
1352 strbuf_addstr(out, "0,0");
1353 break;
1354 case 1:
1355 strbuf_addstr(out, "1");
1356 break;
1357 default:
1358 strbuf_addf(out, "1,%d", count);
1359 break;
1360 }
1361 }
1362
1363 static void emit_rewrite_lines(struct emit_callback *ecb,
1364 int prefix, const char *data, int size)
1365 {
1366 const char *endp = NULL;
1367 const char *reset = diff_get_color(ecb->color_diff, DIFF_RESET);
1368
1369 while (0 < size) {
1370 int len;
1371
1372 endp = memchr(data, '\n', size);
1373 len = endp ? (endp - data + 1) : size;
1374 if (prefix != '+') {
1375 ecb->lno_in_preimage++;
1376 emit_del_line(reset, ecb, data, len);
1377 } else {
1378 ecb->lno_in_postimage++;
1379 emit_add_line(reset, ecb, data, len);
1380 }
1381 size -= len;
1382 data += len;
1383 }
1384 if (!endp)
1385 emit_diff_symbol(ecb->opt, DIFF_SYMBOL_NO_LF_EOF, NULL, 0, 0);
1386 }
1387
1388 static void emit_rewrite_diff(const char *name_a,
1389 const char *name_b,
1390 struct diff_filespec *one,
1391 struct diff_filespec *two,
1392 struct userdiff_driver *textconv_one,
1393 struct userdiff_driver *textconv_two,
1394 struct diff_options *o)
1395 {
1396 int lc_a, lc_b;
1397 static struct strbuf a_name = STRBUF_INIT, b_name = STRBUF_INIT;
1398 const char *a_prefix, *b_prefix;
1399 char *data_one, *data_two;
1400 size_t size_one, size_two;
1401 struct emit_callback ecbdata;
1402 struct strbuf out = STRBUF_INIT;
1403
1404 if (diff_mnemonic_prefix && o->flags.reverse_diff) {
1405 a_prefix = o->b_prefix;
1406 b_prefix = o->a_prefix;
1407 } else {
1408 a_prefix = o->a_prefix;
1409 b_prefix = o->b_prefix;
1410 }
1411
1412 name_a += (*name_a == '/');
1413 name_b += (*name_b == '/');
1414
1415 strbuf_reset(&a_name);
1416 strbuf_reset(&b_name);
1417 quote_two_c_style(&a_name, a_prefix, name_a, 0);
1418 quote_two_c_style(&b_name, b_prefix, name_b, 0);
1419
1420 size_one = fill_textconv(textconv_one, one, &data_one);
1421 size_two = fill_textconv(textconv_two, two, &data_two);
1422
1423 memset(&ecbdata, 0, sizeof(ecbdata));
1424 ecbdata.color_diff = want_color(o->use_color);
1425 ecbdata.ws_rule = whitespace_rule(name_b);
1426 ecbdata.opt = o;
1427 if (ecbdata.ws_rule & WS_BLANK_AT_EOF) {
1428 mmfile_t mf1, mf2;
1429 mf1.ptr = (char *)data_one;
1430 mf2.ptr = (char *)data_two;
1431 mf1.size = size_one;
1432 mf2.size = size_two;
1433 check_blank_at_eof(&mf1, &mf2, &ecbdata);
1434 }
1435 ecbdata.lno_in_preimage = 1;
1436 ecbdata.lno_in_postimage = 1;
1437
1438 lc_a = count_lines(data_one, size_one);
1439 lc_b = count_lines(data_two, size_two);
1440
1441 emit_diff_symbol(o, DIFF_SYMBOL_FILEPAIR_MINUS,
1442 a_name.buf, a_name.len, 0);
1443 emit_diff_symbol(o, DIFF_SYMBOL_FILEPAIR_PLUS,
1444 b_name.buf, b_name.len, 0);
1445
1446 strbuf_addstr(&out, "@@ -");
1447 if (!o->irreversible_delete)
1448 add_line_count(&out, lc_a);
1449 else
1450 strbuf_addstr(&out, "?,?");
1451 strbuf_addstr(&out, " +");
1452 add_line_count(&out, lc_b);
1453 strbuf_addstr(&out, " @@\n");
1454 emit_diff_symbol(o, DIFF_SYMBOL_REWRITE_DIFF, out.buf, out.len, 0);
1455 strbuf_release(&out);
1456
1457 if (lc_a && !o->irreversible_delete)
1458 emit_rewrite_lines(&ecbdata, '-', data_one, size_one);
1459 if (lc_b)
1460 emit_rewrite_lines(&ecbdata, '+', data_two, size_two);
1461 if (textconv_one)
1462 free((char *)data_one);
1463 if (textconv_two)
1464 free((char *)data_two);
1465 }
1466
1467 struct diff_words_buffer {
1468 mmfile_t text;
1469 unsigned long alloc;
1470 struct diff_words_orig {
1471 const char *begin, *end;
1472 } *orig;
1473 int orig_nr, orig_alloc;
1474 };
1475
1476 static void diff_words_append(char *line, unsigned long len,
1477 struct diff_words_buffer *buffer)
1478 {
1479 ALLOC_GROW(buffer->text.ptr, buffer->text.size + len, buffer->alloc);
1480 line++;
1481 len--;
1482 memcpy(buffer->text.ptr + buffer->text.size, line, len);
1483 buffer->text.size += len;
1484 buffer->text.ptr[buffer->text.size] = '\0';
1485 }
1486
1487 struct diff_words_style_elem {
1488 const char *prefix;
1489 const char *suffix;
1490 const char *color; /* NULL; filled in by the setup code if
1491 * color is enabled */
1492 };
1493
1494 struct diff_words_style {
1495 enum diff_words_type type;
1496 struct diff_words_style_elem new_word, old_word, ctx;
1497 const char *newline;
1498 };
1499
1500 static struct diff_words_style diff_words_styles[] = {
1501 { DIFF_WORDS_PORCELAIN, {"+", "\n"}, {"-", "\n"}, {" ", "\n"}, "~\n" },
1502 { DIFF_WORDS_PLAIN, {"{+", "+}"}, {"[-", "-]"}, {"", ""}, "\n" },
1503 { DIFF_WORDS_COLOR, {"", ""}, {"", ""}, {"", ""}, "\n" }
1504 };
1505
1506 struct diff_words_data {
1507 struct diff_words_buffer minus, plus;
1508 const char *current_plus;
1509 int last_minus;
1510 struct diff_options *opt;
1511 regex_t *word_regex;
1512 enum diff_words_type type;
1513 struct diff_words_style *style;
1514 };
1515
1516 static int fn_out_diff_words_write_helper(struct diff_options *o,
1517 struct diff_words_style_elem *st_el,
1518 const char *newline,
1519 size_t count, const char *buf)
1520 {
1521 int print = 0;
1522 struct strbuf sb = STRBUF_INIT;
1523
1524 while (count) {
1525 char *p = memchr(buf, '\n', count);
1526 if (print)
1527 strbuf_addstr(&sb, diff_line_prefix(o));
1528
1529 if (p != buf) {
1530 const char *reset = st_el->color && *st_el->color ?
1531 GIT_COLOR_RESET : NULL;
1532 if (st_el->color && *st_el->color)
1533 strbuf_addstr(&sb, st_el->color);
1534 strbuf_addstr(&sb, st_el->prefix);
1535 strbuf_add(&sb, buf, p ? p - buf : count);
1536 strbuf_addstr(&sb, st_el->suffix);
1537 if (reset)
1538 strbuf_addstr(&sb, reset);
1539 }
1540 if (!p)
1541 goto out;
1542
1543 strbuf_addstr(&sb, newline);
1544 count -= p + 1 - buf;
1545 buf = p + 1;
1546 print = 1;
1547 if (count) {
1548 emit_diff_symbol(o, DIFF_SYMBOL_WORD_DIFF,
1549 sb.buf, sb.len, 0);
1550 strbuf_reset(&sb);
1551 }
1552 }
1553
1554 out:
1555 if (sb.len)
1556 emit_diff_symbol(o, DIFF_SYMBOL_WORD_DIFF,
1557 sb.buf, sb.len, 0);
1558 strbuf_release(&sb);
1559 return 0;
1560 }
1561
1562 /*
1563 * '--color-words' algorithm can be described as:
1564 *
1565 * 1. collect the minus/plus lines of a diff hunk, divided into
1566 * minus-lines and plus-lines;
1567 *
1568 * 2. break both minus-lines and plus-lines into words and
1569 * place them into two mmfile_t with one word for each line;
1570 *
1571 * 3. use xdiff to run diff on the two mmfile_t to get the words level diff;
1572 *
1573 * And for the common parts of the both file, we output the plus side text.
1574 * diff_words->current_plus is used to trace the current position of the plus file
1575 * which printed. diff_words->last_minus is used to trace the last minus word
1576 * printed.
1577 *
1578 * For '--graph' to work with '--color-words', we need to output the graph prefix
1579 * on each line of color words output. Generally, there are two conditions on
1580 * which we should output the prefix.
1581 *
1582 * 1. diff_words->last_minus == 0 &&
1583 * diff_words->current_plus == diff_words->plus.text.ptr
1584 *
1585 * that is: the plus text must start as a new line, and if there is no minus
1586 * word printed, a graph prefix must be printed.
1587 *
1588 * 2. diff_words->current_plus > diff_words->plus.text.ptr &&
1589 * *(diff_words->current_plus - 1) == '\n'
1590 *
1591 * that is: a graph prefix must be printed following a '\n'
1592 */
1593 static int color_words_output_graph_prefix(struct diff_words_data *diff_words)
1594 {
1595 if ((diff_words->last_minus == 0 &&
1596 diff_words->current_plus == diff_words->plus.text.ptr) ||
1597 (diff_words->current_plus > diff_words->plus.text.ptr &&
1598 *(diff_words->current_plus - 1) == '\n')) {
1599 return 1;
1600 } else {
1601 return 0;
1602 }
1603 }
1604
1605 static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
1606 {
1607 struct diff_words_data *diff_words = priv;
1608 struct diff_words_style *style = diff_words->style;
1609 int minus_first, minus_len, plus_first, plus_len;
1610 const char *minus_begin, *minus_end, *plus_begin, *plus_end;
1611 struct diff_options *opt = diff_words->opt;
1612 const char *line_prefix;
1613
1614 if (line[0] != '@' || parse_hunk_header(line, len,
1615 &minus_first, &minus_len, &plus_first, &plus_len))
1616 return;
1617
1618 assert(opt);
1619 line_prefix = diff_line_prefix(opt);
1620
1621 /* POSIX requires that first be decremented by one if len == 0... */
1622 if (minus_len) {
1623 minus_begin = diff_words->minus.orig[minus_first].begin;
1624 minus_end =
1625 diff_words->minus.orig[minus_first + minus_len - 1].end;
1626 } else
1627 minus_begin = minus_end =
1628 diff_words->minus.orig[minus_first].end;
1629
1630 if (plus_len) {
1631 plus_begin = diff_words->plus.orig[plus_first].begin;
1632 plus_end = diff_words->plus.orig[plus_first + plus_len - 1].end;
1633 } else
1634 plus_begin = plus_end = diff_words->plus.orig[plus_first].end;
1635
1636 if (color_words_output_graph_prefix(diff_words)) {
1637 fputs(line_prefix, diff_words->opt->file);
1638 }
1639 if (diff_words->current_plus != plus_begin) {
1640 fn_out_diff_words_write_helper(diff_words->opt,
1641 &style->ctx, style->newline,
1642 plus_begin - diff_words->current_plus,
1643 diff_words->current_plus);
1644 }
1645 if (minus_begin != minus_end) {
1646 fn_out_diff_words_write_helper(diff_words->opt,
1647 &style->old_word, style->newline,
1648 minus_end - minus_begin, minus_begin);
1649 }
1650 if (plus_begin != plus_end) {
1651 fn_out_diff_words_write_helper(diff_words->opt,
1652 &style->new_word, style->newline,
1653 plus_end - plus_begin, plus_begin);
1654 }
1655
1656 diff_words->current_plus = plus_end;
1657 diff_words->last_minus = minus_first;
1658 }
1659
1660 /* This function starts looking at *begin, and returns 0 iff a word was found. */
1661 static int find_word_boundaries(mmfile_t *buffer, regex_t *word_regex,
1662 int *begin, int *end)
1663 {
1664 if (word_regex && *begin < buffer->size) {
1665 regmatch_t match[1];
1666 if (!regexec_buf(word_regex, buffer->ptr + *begin,
1667 buffer->size - *begin, 1, match, 0)) {
1668 char *p = memchr(buffer->ptr + *begin + match[0].rm_so,
1669 '\n', match[0].rm_eo - match[0].rm_so);
1670 *end = p ? p - buffer->ptr : match[0].rm_eo + *begin;
1671 *begin += match[0].rm_so;
1672 return *begin >= *end;
1673 }
1674 return -1;
1675 }
1676
1677 /* find the next word */
1678 while (*begin < buffer->size && isspace(buffer->ptr[*begin]))
1679 (*begin)++;
1680 if (*begin >= buffer->size)
1681 return -1;
1682
1683 /* find the end of the word */
1684 *end = *begin + 1;
1685 while (*end < buffer->size && !isspace(buffer->ptr[*end]))
1686 (*end)++;
1687
1688 return 0;
1689 }
1690
1691 /*
1692 * This function splits the words in buffer->text, stores the list with
1693 * newline separator into out, and saves the offsets of the original words
1694 * in buffer->orig.
1695 */
1696 static void diff_words_fill(struct diff_words_buffer *buffer, mmfile_t *out,
1697 regex_t *word_regex)
1698 {
1699 int i, j;
1700 long alloc = 0;
1701
1702 out->size = 0;
1703 out->ptr = NULL;
1704
1705 /* fake an empty "0th" word */
1706 ALLOC_GROW(buffer->orig, 1, buffer->orig_alloc);
1707 buffer->orig[0].begin = buffer->orig[0].end = buffer->text.ptr;
1708 buffer->orig_nr = 1;
1709
1710 for (i = 0; i < buffer->text.size; i++) {
1711 if (find_word_boundaries(&buffer->text, word_regex, &i, &j))
1712 return;
1713
1714 /* store original boundaries */
1715 ALLOC_GROW(buffer->orig, buffer->orig_nr + 1,
1716 buffer->orig_alloc);
1717 buffer->orig[buffer->orig_nr].begin = buffer->text.ptr + i;
1718 buffer->orig[buffer->orig_nr].end = buffer->text.ptr + j;
1719 buffer->orig_nr++;
1720
1721 /* store one word */
1722 ALLOC_GROW(out->ptr, out->size + j - i + 1, alloc);
1723 memcpy(out->ptr + out->size, buffer->text.ptr + i, j - i);
1724 out->ptr[out->size + j - i] = '\n';
1725 out->size += j - i + 1;
1726
1727 i = j - 1;
1728 }
1729 }
1730
1731 /* this executes the word diff on the accumulated buffers */
1732 static void diff_words_show(struct diff_words_data *diff_words)
1733 {
1734 xpparam_t xpp;
1735 xdemitconf_t xecfg;
1736 mmfile_t minus, plus;
1737 struct diff_words_style *style = diff_words->style;
1738
1739 struct diff_options *opt = diff_words->opt;
1740 const char *line_prefix;
1741
1742 assert(opt);
1743 line_prefix = diff_line_prefix(opt);
1744
1745 /* special case: only removal */
1746 if (!diff_words->plus.text.size) {
1747 emit_diff_symbol(diff_words->opt, DIFF_SYMBOL_WORD_DIFF,
1748 line_prefix, strlen(line_prefix), 0);
1749 fn_out_diff_words_write_helper(diff_words->opt,
1750 &style->old_word, style->newline,
1751 diff_words->minus.text.size,
1752 diff_words->minus.text.ptr);
1753 diff_words->minus.text.size = 0;
1754 return;
1755 }
1756
1757 diff_words->current_plus = diff_words->plus.text.ptr;
1758 diff_words->last_minus = 0;
1759
1760 memset(&xpp, 0, sizeof(xpp));
1761 memset(&xecfg, 0, sizeof(xecfg));
1762 diff_words_fill(&diff_words->minus, &minus, diff_words->word_regex);
1763 diff_words_fill(&diff_words->plus, &plus, diff_words->word_regex);
1764 xpp.flags = 0;
1765 /* as only the hunk header will be parsed, we need a 0-context */
1766 xecfg.ctxlen = 0;
1767 if (xdi_diff_outf(&minus, &plus, fn_out_diff_words_aux, diff_words,
1768 &xpp, &xecfg))
1769 die("unable to generate word diff");
1770 free(minus.ptr);
1771 free(plus.ptr);
1772 if (diff_words->current_plus != diff_words->plus.text.ptr +
1773 diff_words->plus.text.size) {
1774 if (color_words_output_graph_prefix(diff_words))
1775 emit_diff_symbol(diff_words->opt, DIFF_SYMBOL_WORD_DIFF,
1776 line_prefix, strlen(line_prefix), 0);
1777 fn_out_diff_words_write_helper(diff_words->opt,
1778 &style->ctx, style->newline,
1779 diff_words->plus.text.ptr + diff_words->plus.text.size
1780 - diff_words->current_plus, diff_words->current_plus);
1781 }
1782 diff_words->minus.text.size = diff_words->plus.text.size = 0;
1783 }
1784
1785 /* In "color-words" mode, show word-diff of words accumulated in the buffer */
1786 static void diff_words_flush(struct emit_callback *ecbdata)
1787 {
1788 struct diff_options *wo = ecbdata->diff_words->opt;
1789
1790 if (ecbdata->diff_words->minus.text.size ||
1791 ecbdata->diff_words->plus.text.size)
1792 diff_words_show(ecbdata->diff_words);
1793
1794 if (wo->emitted_symbols) {
1795 struct diff_options *o = ecbdata->opt;
1796 struct emitted_diff_symbols *wol = wo->emitted_symbols;
1797 int i;
1798
1799 /*
1800 * NEEDSWORK:
1801 * Instead of appending each, concat all words to a line?
1802 */
1803 for (i = 0; i < wol->nr; i++)
1804 append_emitted_diff_symbol(o, &wol->buf[i]);
1805
1806 for (i = 0; i < wol->nr; i++)
1807 free((void *)wol->buf[i].line);
1808
1809 wol->nr = 0;
1810 }
1811 }
1812
1813 static void diff_filespec_load_driver(struct diff_filespec *one)
1814 {
1815 /* Use already-loaded driver */
1816 if (one->driver)
1817 return;
1818
1819 if (S_ISREG(one->mode))
1820 one->driver = userdiff_find_by_path(one->path);
1821
1822 /* Fallback to default settings */
1823 if (!one->driver)
1824 one->driver = userdiff_find_by_name("default");
1825 }
1826
1827 static const char *userdiff_word_regex(struct diff_filespec *one)
1828 {
1829 diff_filespec_load_driver(one);
1830 return one->driver->word_regex;
1831 }
1832
1833 static void init_diff_words_data(struct emit_callback *ecbdata,
1834 struct diff_options *orig_opts,
1835 struct diff_filespec *one,
1836 struct diff_filespec *two)
1837 {
1838 int i;
1839 struct diff_options *o = xmalloc(sizeof(struct diff_options));
1840 memcpy(o, orig_opts, sizeof(struct diff_options));
1841
1842 ecbdata->diff_words =
1843 xcalloc(1, sizeof(struct diff_words_data));
1844 ecbdata->diff_words->type = o->word_diff;
1845 ecbdata->diff_words->opt = o;
1846
1847 if (orig_opts->emitted_symbols)
1848 o->emitted_symbols =
1849 xcalloc(1, sizeof(struct emitted_diff_symbols));
1850
1851 if (!o->word_regex)
1852 o->word_regex = userdiff_word_regex(one);
1853 if (!o->word_regex)
1854 o->word_regex = userdiff_word_regex(two);
1855 if (!o->word_regex)
1856 o->word_regex = diff_word_regex_cfg;
1857 if (o->word_regex) {
1858 ecbdata->diff_words->word_regex = (regex_t *)
1859 xmalloc(sizeof(regex_t));
1860 if (regcomp(ecbdata->diff_words->word_regex,
1861 o->word_regex,
1862 REG_EXTENDED | REG_NEWLINE))
1863 die ("Invalid regular expression: %s",
1864 o->word_regex);
1865 }
1866 for (i = 0; i < ARRAY_SIZE(diff_words_styles); i++) {
1867 if (o->word_diff == diff_words_styles[i].type) {
1868 ecbdata->diff_words->style =
1869 &diff_words_styles[i];
1870 break;
1871 }
1872 }
1873 if (want_color(o->use_color)) {
1874 struct diff_words_style *st = ecbdata->diff_words->style;
1875 st->old_word.color = diff_get_color_opt(o, DIFF_FILE_OLD);
1876 st->new_word.color = diff_get_color_opt(o, DIFF_FILE_NEW);
1877 st->ctx.color = diff_get_color_opt(o, DIFF_CONTEXT);
1878 }
1879 }
1880
1881 static void free_diff_words_data(struct emit_callback *ecbdata)
1882 {
1883 if (ecbdata->diff_words) {
1884 diff_words_flush(ecbdata);
1885 free (ecbdata->diff_words->opt->emitted_symbols);
1886 free (ecbdata->diff_words->opt);
1887 free (ecbdata->diff_words->minus.text.ptr);
1888 free (ecbdata->diff_words->minus.orig);
1889 free (ecbdata->diff_words->plus.text.ptr);
1890 free (ecbdata->diff_words->plus.orig);
1891 if (ecbdata->diff_words->word_regex) {
1892 regfree(ecbdata->diff_words->word_regex);
1893 free(ecbdata->diff_words->word_regex);
1894 }
1895 FREE_AND_NULL(ecbdata->diff_words);
1896 }
1897 }
1898
1899 const char *diff_get_color(int diff_use_color, enum color_diff ix)
1900 {
1901 if (want_color(diff_use_color))
1902 return diff_colors[ix];
1903 return "";
1904 }
1905
1906 const char *diff_line_prefix(struct diff_options *opt)
1907 {
1908 struct strbuf *msgbuf;
1909 if (!opt->output_prefix)
1910 return "";
1911
1912 msgbuf = opt->output_prefix(opt, opt->output_prefix_data);
1913 return msgbuf->buf;
1914 }
1915
1916 static unsigned long sane_truncate_line(struct emit_callback *ecb, char *line, unsigned long len)
1917 {
1918 const char *cp;
1919 unsigned long allot;
1920 size_t l = len;
1921
1922 cp = line;
1923 allot = l;
1924 while (0 < l) {
1925 (void) utf8_width(&cp, &l);
1926 if (!cp)
1927 break; /* truncated in the middle? */
1928 }
1929 return allot - l;
1930 }
1931
1932 static void find_lno(const char *line, struct emit_callback *ecbdata)
1933 {
1934 const char *p;
1935 ecbdata->lno_in_preimage = 0;
1936 ecbdata->lno_in_postimage = 0;
1937 p = strchr(line, '-');
1938 if (!p)
1939 return; /* cannot happen */
1940 ecbdata->lno_in_preimage = strtol(p + 1, NULL, 10);
1941 p = strchr(p, '+');
1942 if (!p)
1943 return; /* cannot happen */
1944 ecbdata->lno_in_postimage = strtol(p + 1, NULL, 10);
1945 }
1946
1947 static void fn_out_consume(void *priv, char *line, unsigned long len)
1948 {
1949 struct emit_callback *ecbdata = priv;
1950 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
1951 struct diff_options *o = ecbdata->opt;
1952
1953 o->found_changes = 1;
1954
1955 if (ecbdata->header) {
1956 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
1957 ecbdata->header->buf, ecbdata->header->len, 0);
1958 strbuf_reset(ecbdata->header);
1959 ecbdata->header = NULL;
1960 }
1961
1962 if (ecbdata->label_path[0]) {
1963 emit_diff_symbol(o, DIFF_SYMBOL_FILEPAIR_MINUS,
1964 ecbdata->label_path[0],
1965 strlen(ecbdata->label_path[0]), 0);
1966 emit_diff_symbol(o, DIFF_SYMBOL_FILEPAIR_PLUS,
1967 ecbdata->label_path[1],
1968 strlen(ecbdata->label_path[1]), 0);
1969 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
1970 }
1971
1972 if (diff_suppress_blank_empty
1973 && len == 2 && line[0] == ' ' && line[1] == '\n') {
1974 line[0] = '\n';
1975 len = 1;
1976 }
1977
1978 if (line[0] == '@') {
1979 if (ecbdata->diff_words)
1980 diff_words_flush(ecbdata);
1981 len = sane_truncate_line(ecbdata, line, len);
1982 find_lno(line, ecbdata);
1983 emit_hunk_header(ecbdata, line, len);
1984 return;
1985 }
1986
1987 if (ecbdata->diff_words) {
1988 enum diff_symbol s =
1989 ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN ?
1990 DIFF_SYMBOL_WORDS_PORCELAIN : DIFF_SYMBOL_WORDS;
1991 if (line[0] == '-') {
1992 diff_words_append(line, len,
1993 &ecbdata->diff_words->minus);
1994 return;
1995 } else if (line[0] == '+') {
1996 diff_words_append(line, len,
1997 &ecbdata->diff_words->plus);
1998 return;
1999 } else if (starts_with(line, "\\ ")) {
2000 /*
2001 * Eat the "no newline at eof" marker as if we
2002 * saw a "+" or "-" line with nothing on it,
2003 * and return without diff_words_flush() to
2004 * defer processing. If this is the end of
2005 * preimage, more "+" lines may come after it.
2006 */
2007 return;
2008 }
2009 diff_words_flush(ecbdata);
2010 emit_diff_symbol(o, s, line, len, 0);
2011 return;
2012 }
2013
2014 switch (line[0]) {
2015 case '+':
2016 ecbdata->lno_in_postimage++;
2017 emit_add_line(reset, ecbdata, line + 1, len - 1);
2018 break;
2019 case '-':
2020 ecbdata->lno_in_preimage++;
2021 emit_del_line(reset, ecbdata, line + 1, len - 1);
2022 break;
2023 case ' ':
2024 ecbdata->lno_in_postimage++;
2025 ecbdata->lno_in_preimage++;
2026 emit_context_line(reset, ecbdata, line + 1, len - 1);
2027 break;
2028 default:
2029 /* incomplete line at the end */
2030 ecbdata->lno_in_preimage++;
2031 emit_diff_symbol(o, DIFF_SYMBOL_CONTEXT_INCOMPLETE,
2032 line, len, 0);
2033 break;
2034 }
2035 }
2036
2037 static void pprint_rename(struct strbuf *name, const char *a, const char *b)
2038 {
2039 const char *old_name = a;
2040 const char *new_name = b;
2041 int pfx_length, sfx_length;
2042 int pfx_adjust_for_slash;
2043 int len_a = strlen(a);
2044 int len_b = strlen(b);
2045 int a_midlen, b_midlen;
2046 int qlen_a = quote_c_style(a, NULL, NULL, 0);
2047 int qlen_b = quote_c_style(b, NULL, NULL, 0);
2048
2049 if (qlen_a || qlen_b) {
2050 quote_c_style(a, name, NULL, 0);
2051 strbuf_addstr(name, " => ");
2052 quote_c_style(b, name, NULL, 0);
2053 return;
2054 }
2055
2056 /* Find common prefix */
2057 pfx_length = 0;
2058 while (*old_name && *new_name && *old_name == *new_name) {
2059 if (*old_name == '/')
2060 pfx_length = old_name - a + 1;
2061 old_name++;
2062 new_name++;
2063 }
2064
2065 /* Find common suffix */
2066 old_name = a + len_a;
2067 new_name = b + len_b;
2068 sfx_length = 0;
2069 /*
2070 * If there is a common prefix, it must end in a slash. In
2071 * that case we let this loop run 1 into the prefix to see the
2072 * same slash.
2073 *
2074 * If there is no common prefix, we cannot do this as it would
2075 * underrun the input strings.
2076 */
2077 pfx_adjust_for_slash = (pfx_length ? 1 : 0);
2078 while (a + pfx_length - pfx_adjust_for_slash <= old_name &&
2079 b + pfx_length - pfx_adjust_for_slash <= new_name &&
2080 *old_name == *new_name) {
2081 if (*old_name == '/')
2082 sfx_length = len_a - (old_name - a);
2083 old_name--;
2084 new_name--;
2085 }
2086
2087 /*
2088 * pfx{mid-a => mid-b}sfx
2089 * {pfx-a => pfx-b}sfx
2090 * pfx{sfx-a => sfx-b}
2091 * name-a => name-b
2092 */
2093 a_midlen = len_a - pfx_length - sfx_length;
2094 b_midlen = len_b - pfx_length - sfx_length;
2095 if (a_midlen < 0)
2096 a_midlen = 0;
2097 if (b_midlen < 0)
2098 b_midlen = 0;
2099
2100 strbuf_grow(name, pfx_length + a_midlen + b_midlen + sfx_length + 7);
2101 if (pfx_length + sfx_length) {
2102 strbuf_add(name, a, pfx_length);
2103 strbuf_addch(name, '{');
2104 }
2105 strbuf_add(name, a + pfx_length, a_midlen);
2106 strbuf_addstr(name, " => ");
2107 strbuf_add(name, b + pfx_length, b_midlen);
2108 if (pfx_length + sfx_length) {
2109 strbuf_addch(name, '}');
2110 strbuf_add(name, a + len_a - sfx_length, sfx_length);
2111 }
2112 }
2113
2114 struct diffstat_t {
2115 int nr;
2116 int alloc;
2117 struct diffstat_file {
2118 char *from_name;
2119 char *name;
2120 char *print_name;
2121 const char *comments;
2122 unsigned is_unmerged:1;
2123 unsigned is_binary:1;
2124 unsigned is_renamed:1;
2125 unsigned is_interesting:1;
2126 uintmax_t added, deleted;
2127 } **files;
2128 };
2129
2130 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
2131 const char *name_a,
2132 const char *name_b)
2133 {
2134 struct diffstat_file *x;
2135 x = xcalloc(1, sizeof(*x));
2136 ALLOC_GROW(diffstat->files, diffstat->nr + 1, diffstat->alloc);
2137 diffstat->files[diffstat->nr++] = x;
2138 if (name_b) {
2139 x->from_name = xstrdup(name_a);
2140 x->name = xstrdup(name_b);
2141 x->is_renamed = 1;
2142 }
2143 else {
2144 x->from_name = NULL;
2145 x->name = xstrdup(name_a);
2146 }
2147 return x;
2148 }
2149
2150 static void diffstat_consume(void *priv, char *line, unsigned long len)
2151 {
2152 struct diffstat_t *diffstat = priv;
2153 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
2154
2155 if (line[0] == '+')
2156 x->added++;
2157 else if (line[0] == '-')
2158 x->deleted++;
2159 }
2160
2161 const char mime_boundary_leader[] = "------------";
2162
2163 static int scale_linear(int it, int width, int max_change)
2164 {
2165 if (!it)
2166 return 0;
2167 /*
2168 * make sure that at least one '-' or '+' is printed if
2169 * there is any change to this path. The easiest way is to
2170 * scale linearly as if the alloted width is one column shorter
2171 * than it is, and then add 1 to the result.
2172 */
2173 return 1 + (it * (width - 1) / max_change);
2174 }
2175
2176 static void show_graph(struct strbuf *out, char ch, int cnt,
2177 const char *set, const char *reset)
2178 {
2179 if (cnt <= 0)
2180 return;
2181 strbuf_addstr(out, set);
2182 strbuf_addchars(out, ch, cnt);
2183 strbuf_addstr(out, reset);
2184 }
2185
2186 static void fill_print_name(struct diffstat_file *file)
2187 {
2188 struct strbuf pname = STRBUF_INIT;
2189
2190 if (file->print_name)
2191 return;
2192
2193 if (file->is_renamed)
2194 pprint_rename(&pname, file->from_name, file->name);
2195 else
2196 quote_c_style(file->name, &pname, NULL, 0);
2197
2198 if (file->comments)
2199 strbuf_addf(&pname, " (%s)", file->comments);
2200
2201 file->print_name = strbuf_detach(&pname, NULL);
2202 }
2203
2204 static void print_stat_summary_inserts_deletes(struct diff_options *options,
2205 int files, int insertions, int deletions)
2206 {
2207 struct strbuf sb = STRBUF_INIT;
2208
2209 if (!files) {
2210 assert(insertions == 0 && deletions == 0);
2211 emit_diff_symbol(options, DIFF_SYMBOL_STATS_SUMMARY_NO_FILES,
2212 NULL, 0, 0);
2213 return;
2214 }
2215
2216 strbuf_addf(&sb,
2217 (files == 1) ? " %d file changed" : " %d files changed",
2218 files);
2219
2220 /*
2221 * For binary diff, the caller may want to print "x files
2222 * changed" with insertions == 0 && deletions == 0.
2223 *
2224 * Not omitting "0 insertions(+), 0 deletions(-)" in this case
2225 * is probably less confusing (i.e skip over "2 files changed
2226 * but nothing about added/removed lines? Is this a bug in Git?").
2227 */
2228 if (insertions || deletions == 0) {
2229 strbuf_addf(&sb,
2230 (insertions == 1) ? ", %d insertion(+)" : ", %d insertions(+)",
2231 insertions);
2232 }
2233
2234 if (deletions || insertions == 0) {
2235 strbuf_addf(&sb,
2236 (deletions == 1) ? ", %d deletion(-)" : ", %d deletions(-)",
2237 deletions);
2238 }
2239 strbuf_addch(&sb, '\n');
2240 emit_diff_symbol(options, DIFF_SYMBOL_STATS_SUMMARY_INSERTS_DELETES,
2241 sb.buf, sb.len, 0);
2242 strbuf_release(&sb);
2243 }
2244
2245 void print_stat_summary(FILE *fp, int files,
2246 int insertions, int deletions)
2247 {
2248 struct diff_options o;
2249 memset(&o, 0, sizeof(o));
2250 o.file = fp;
2251
2252 print_stat_summary_inserts_deletes(&o, files, insertions, deletions);
2253 }
2254
2255 static void show_stats(struct diffstat_t *data, struct diff_options *options)
2256 {
2257 int i, len, add, del, adds = 0, dels = 0;
2258 uintmax_t max_change = 0, max_len = 0;
2259 int total_files = data->nr, count;
2260 int width, name_width, graph_width, number_width = 0, bin_width = 0;
2261 const char *reset, *add_c, *del_c;
2262 int extra_shown = 0;
2263 const char *line_prefix = diff_line_prefix(options);
2264 struct strbuf out = STRBUF_INIT;
2265
2266 if (data->nr == 0)
2267 return;
2268
2269 count = options->stat_count ? options->stat_count : data->nr;
2270
2271 reset = diff_get_color_opt(options, DIFF_RESET);
2272 add_c = diff_get_color_opt(options, DIFF_FILE_NEW);
2273 del_c = diff_get_color_opt(options, DIFF_FILE_OLD);
2274
2275 /*
2276 * Find the longest filename and max number of changes
2277 */
2278 for (i = 0; (i < count) && (i < data->nr); i++) {
2279 struct diffstat_file *file = data->files[i];
2280 uintmax_t change = file->added + file->deleted;
2281
2282 if (!file->is_interesting && (change == 0)) {
2283 count++; /* not shown == room for one more */
2284 continue;
2285 }
2286 fill_print_name(file);
2287 len = strlen(file->print_name);
2288 if (max_len < len)
2289 max_len = len;
2290
2291 if (file->is_unmerged) {
2292 /* "Unmerged" is 8 characters */
2293 bin_width = bin_width < 8 ? 8 : bin_width;
2294 continue;
2295 }
2296 if (file->is_binary) {
2297 /* "Bin XXX -> YYY bytes" */
2298 int w = 14 + decimal_width(file->added)
2299 + decimal_width(file->deleted);
2300 bin_width = bin_width < w ? w : bin_width;
2301 /* Display change counts aligned with "Bin" */
2302 number_width = 3;
2303 continue;
2304 }
2305
2306 if (max_change < change)
2307 max_change = change;
2308 }
2309 count = i; /* where we can stop scanning in data->files[] */
2310
2311 /*
2312 * We have width = stat_width or term_columns() columns total.
2313 * We want a maximum of min(max_len, stat_name_width) for the name part.
2314 * We want a maximum of min(max_change, stat_graph_width) for the +- part.
2315 * We also need 1 for " " and 4 + decimal_width(max_change)
2316 * for " | NNNN " and one the empty column at the end, altogether
2317 * 6 + decimal_width(max_change).
2318 *
2319 * If there's not enough space, we will use the smaller of
2320 * stat_name_width (if set) and 5/8*width for the filename,
2321 * and the rest for constant elements + graph part, but no more
2322 * than stat_graph_width for the graph part.
2323 * (5/8 gives 50 for filename and 30 for the constant parts + graph
2324 * for the standard terminal size).
2325 *
2326 * In other words: stat_width limits the maximum width, and
2327 * stat_name_width fixes the maximum width of the filename,
2328 * and is also used to divide available columns if there
2329 * aren't enough.
2330 *
2331 * Binary files are displayed with "Bin XXX -> YYY bytes"
2332 * instead of the change count and graph. This part is treated
2333 * similarly to the graph part, except that it is not
2334 * "scaled". If total width is too small to accommodate the
2335 * guaranteed minimum width of the filename part and the
2336 * separators and this message, this message will "overflow"
2337 * making the line longer than the maximum width.
2338 */
2339
2340 if (options->stat_width == -1)
2341 width = term_columns() - strlen(line_prefix);
2342 else
2343 width = options->stat_width ? options->stat_width : 80;
2344 number_width = decimal_width(max_change) > number_width ?
2345 decimal_width(max_change) : number_width;
2346
2347 if (options->stat_graph_width == -1)
2348 options->stat_graph_width = diff_stat_graph_width;
2349
2350 /*
2351 * Guarantee 3/8*16==6 for the graph part
2352 * and 5/8*16==10 for the filename part
2353 */
2354 if (width < 16 + 6 + number_width)
2355 width = 16 + 6 + number_width;
2356
2357 /*
2358 * First assign sizes that are wanted, ignoring available width.
2359 * strlen("Bin XXX -> YYY bytes") == bin_width, and the part
2360 * starting from "XXX" should fit in graph_width.
2361 */
2362 graph_width = max_change + 4 > bin_width ? max_change : bin_width - 4;
2363 if (options->stat_graph_width &&
2364 options->stat_graph_width < graph_width)
2365 graph_width = options->stat_graph_width;
2366
2367 name_width = (options->stat_name_width > 0 &&
2368 options->stat_name_width < max_len) ?
2369 options->stat_name_width : max_len;
2370
2371 /*
2372 * Adjust adjustable widths not to exceed maximum width
2373 */
2374 if (name_width + number_width + 6 + graph_width > width) {
2375 if (graph_width > width * 3/8 - number_width - 6) {
2376 graph_width = width * 3/8 - number_width - 6;
2377 if (graph_width < 6)
2378 graph_width = 6;
2379 }
2380
2381 if (options->stat_graph_width &&
2382 graph_width > options->stat_graph_width)
2383 graph_width = options->stat_graph_width;
2384 if (name_width > width - number_width - 6 - graph_width)
2385 name_width = width - number_width - 6 - graph_width;
2386 else
2387 graph_width = width - number_width - 6 - name_width;
2388 }
2389
2390 /*
2391 * From here name_width is the width of the name area,
2392 * and graph_width is the width of the graph area.
2393 * max_change is used to scale graph properly.
2394 */
2395 for (i = 0; i < count; i++) {
2396 const char *prefix = "";
2397 struct diffstat_file *file = data->files[i];
2398 char *name = file->print_name;
2399 uintmax_t added = file->added;
2400 uintmax_t deleted = file->deleted;
2401 int name_len;
2402
2403 if (!file->is_interesting && (added + deleted == 0))
2404 continue;
2405
2406 /*
2407 * "scale" the filename
2408 */
2409 len = name_width;
2410 name_len = strlen(name);
2411 if (name_width < name_len) {
2412 char *slash;
2413 prefix = "...";
2414 len -= 3;
2415 name += name_len - len;
2416 slash = strchr(name, '/');
2417 if (slash)
2418 name = slash;
2419 }
2420
2421 if (file->is_binary) {
2422 strbuf_addf(&out, " %s%-*s |", prefix, len, name);
2423 strbuf_addf(&out, " %*s", number_width, "Bin");
2424 if (!added && !deleted) {
2425 strbuf_addch(&out, '\n');
2426 emit_diff_symbol(options, DIFF_SYMBOL_STATS_LINE,
2427 out.buf, out.len, 0);
2428 strbuf_reset(&out);
2429 continue;
2430 }
2431 strbuf_addf(&out, " %s%"PRIuMAX"%s",
2432 del_c, deleted, reset);
2433 strbuf_addstr(&out, " -> ");
2434 strbuf_addf(&out, "%s%"PRIuMAX"%s",
2435 add_c, added, reset);
2436 strbuf_addstr(&out, " bytes\n");
2437 emit_diff_symbol(options, DIFF_SYMBOL_STATS_LINE,
2438 out.buf, out.len, 0);
2439 strbuf_reset(&out);
2440 continue;
2441 }
2442 else if (file->is_unmerged) {
2443 strbuf_addf(&out, " %s%-*s |", prefix, len, name);
2444 strbuf_addstr(&out, " Unmerged\n");
2445 emit_diff_symbol(options, DIFF_SYMBOL_STATS_LINE,
2446 out.buf, out.len, 0);
2447 strbuf_reset(&out);
2448 continue;
2449 }
2450
2451 /*
2452 * scale the add/delete
2453 */
2454 add = added;
2455 del = deleted;
2456
2457 if (graph_width <= max_change) {
2458 int total = scale_linear(add + del, graph_width, max_change);
2459 if (total < 2 && add && del)
2460 /* width >= 2 due to the sanity check */
2461 total = 2;
2462 if (add < del) {
2463 add = scale_linear(add, graph_width, max_change);
2464 del = total - add;
2465 } else {
2466 del = scale_linear(del, graph_width, max_change);
2467 add = total - del;
2468 }
2469 }
2470 strbuf_addf(&out, " %s%-*s |", prefix, len, name);
2471 strbuf_addf(&out, " %*"PRIuMAX"%s",
2472 number_width, added + deleted,
2473 added + deleted ? " " : "");
2474 show_graph(&out, '+', add, add_c, reset);
2475 show_graph(&out, '-', del, del_c, reset);
2476 strbuf_addch(&out, '\n');
2477 emit_diff_symbol(options, DIFF_SYMBOL_STATS_LINE,
2478 out.buf, out.len, 0);
2479 strbuf_reset(&out);
2480 }
2481
2482 for (i = 0; i < data->nr; i++) {
2483 struct diffstat_file *file = data->files[i];
2484 uintmax_t added = file->added;
2485 uintmax_t deleted = file->deleted;
2486
2487 if (file->is_unmerged ||
2488 (!file->is_interesting && (added + deleted == 0))) {
2489 total_files--;
2490 continue;
2491 }
2492
2493 if (!file->is_binary) {
2494 adds += added;
2495 dels += deleted;
2496 }
2497 if (i < count)
2498 continue;
2499 if (!extra_shown)
2500 emit_diff_symbol(options,
2501 DIFF_SYMBOL_STATS_SUMMARY_ABBREV,
2502 NULL, 0, 0);
2503 extra_shown = 1;
2504 }
2505
2506 print_stat_summary_inserts_deletes(options, total_files, adds, dels);
2507 strbuf_release(&out);
2508 }
2509
2510 static void show_shortstats(struct diffstat_t *data, struct diff_options *options)
2511 {
2512 int i, adds = 0, dels = 0, total_files = data->nr;
2513
2514 if (data->nr == 0)
2515 return;
2516
2517 for (i = 0; i < data->nr; i++) {
2518 int added = data->files[i]->added;
2519 int deleted = data->files[i]->deleted;
2520
2521 if (data->files[i]->is_unmerged ||
2522 (!data->files[i]->is_interesting && (added + deleted == 0))) {
2523 total_files--;
2524 } else if (!data->files[i]->is_binary) { /* don't count bytes */
2525 adds += added;
2526 dels += deleted;
2527 }
2528 }
2529 print_stat_summary_inserts_deletes(options, total_files, adds, dels);
2530 }
2531
2532 static void show_numstat(struct diffstat_t *data, struct diff_options *options)
2533 {
2534 int i;
2535
2536 if (data->nr == 0)
2537 return;
2538
2539 for (i = 0; i < data->nr; i++) {
2540 struct diffstat_file *file = data->files[i];
2541
2542 fprintf(options->file, "%s", diff_line_prefix(options));
2543
2544 if (file->is_binary)
2545 fprintf(options->file, "-\t-\t");
2546 else
2547 fprintf(options->file,
2548 "%"PRIuMAX"\t%"PRIuMAX"\t",
2549 file->added, file->deleted);
2550 if (options->line_termination) {
2551 fill_print_name(file);
2552 if (!file->is_renamed)
2553 write_name_quoted(file->name, options->file,
2554 options->line_termination);
2555 else {
2556 fputs(file->print_name, options->file);
2557 putc(options->line_termination, options->file);
2558 }
2559 } else {
2560 if (file->is_renamed) {
2561 putc('\0', options->file);
2562 write_name_quoted(file->from_name, options->file, '\0');
2563 }
2564 write_name_quoted(file->name, options->file, '\0');
2565 }
2566 }
2567 }
2568
2569 struct dirstat_file {
2570 const char *name;
2571 unsigned long changed;
2572 };
2573
2574 struct dirstat_dir {
2575 struct dirstat_file *files;
2576 int alloc, nr, permille, cumulative;
2577 };
2578
2579 static long gather_dirstat(struct diff_options *opt, struct dirstat_dir *dir,
2580 unsigned long changed, const char *base, int baselen)
2581 {
2582 unsigned long sum_changes = 0;
2583 unsigned int sources = 0;
2584 const char *line_prefix = diff_line_prefix(opt);
2585
2586 while (dir->nr) {
2587 struct dirstat_file *f = dir->files;
2588 int namelen = strlen(f->name);
2589 unsigned long changes;
2590 char *slash;
2591
2592 if (namelen < baselen)
2593 break;
2594 if (memcmp(f->name, base, baselen))
2595 break;
2596 slash = strchr(f->name + baselen, '/');
2597 if (slash) {
2598 int newbaselen = slash + 1 - f->name;
2599 changes = gather_dirstat(opt, dir, changed, f->name, newbaselen);
2600 sources++;
2601 } else {
2602 changes = f->changed;
2603 dir->files++;
2604 dir->nr--;
2605 sources += 2;
2606 }
2607 sum_changes += changes;
2608 }
2609
2610 /*
2611 * We don't report dirstat's for
2612 * - the top level
2613 * - or cases where everything came from a single directory
2614 * under this directory (sources == 1).
2615 */
2616 if (baselen && sources != 1) {
2617 if (sum_changes) {
2618 int permille = sum_changes * 1000 / changed;
2619 if (permille >= dir->permille) {
2620 fprintf(opt->file, "%s%4d.%01d%% %.*s\n", line_prefix,
2621 permille / 10, permille % 10, baselen, base);
2622 if (!dir->cumulative)
2623 return 0;
2624 }
2625 }
2626 }
2627 return sum_changes;
2628 }
2629
2630 static int dirstat_compare(const void *_a, const void *_b)
2631 {
2632 const struct dirstat_file *a = _a;
2633 const struct dirstat_file *b = _b;
2634 return strcmp(a->name, b->name);
2635 }
2636
2637 static void show_dirstat(struct diff_options *options)
2638 {
2639 int i;
2640 unsigned long changed;
2641 struct dirstat_dir dir;
2642 struct diff_queue_struct *q = &diff_queued_diff;
2643
2644 dir.files = NULL;
2645 dir.alloc = 0;
2646 dir.nr = 0;
2647 dir.permille = options->dirstat_permille;
2648 dir.cumulative = options->flags.dirstat_cumulative;
2649
2650 changed = 0;
2651 for (i = 0; i < q->nr; i++) {
2652 struct diff_filepair *p = q->queue[i];
2653 const char *name;
2654 unsigned long copied, added, damage;
2655 int content_changed;
2656
2657 name = p->two->path ? p->two->path : p->one->path;
2658
2659 if (p->one->oid_valid && p->two->oid_valid)
2660 content_changed = oidcmp(&p->one->oid, &p->two->oid);
2661 else
2662 content_changed = 1;
2663
2664 if (!content_changed) {
2665 /*
2666 * The SHA1 has not changed, so pre-/post-content is
2667 * identical. We can therefore skip looking at the
2668 * file contents altogether.
2669 */
2670 damage = 0;
2671 goto found_damage;
2672 }
2673
2674 if (options->flags.dirstat_by_file) {
2675 /*
2676 * In --dirstat-by-file mode, we don't really need to
2677 * look at the actual file contents at all.
2678 * The fact that the SHA1 changed is enough for us to
2679 * add this file to the list of results
2680 * (with each file contributing equal damage).
2681 */
2682 damage = 1;
2683 goto found_damage;
2684 }
2685
2686 if (DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) {
2687 diff_populate_filespec(p->one, 0);
2688 diff_populate_filespec(p->two, 0);
2689 diffcore_count_changes(p->one, p->two, NULL, NULL,
2690 &copied, &added);
2691 diff_free_filespec_data(p->one);
2692 diff_free_filespec_data(p->two);
2693 } else if (DIFF_FILE_VALID(p->one)) {
2694 diff_populate_filespec(p->one, CHECK_SIZE_ONLY);
2695 copied = added = 0;
2696 diff_free_filespec_data(p->one);
2697 } else if (DIFF_FILE_VALID(p->two)) {
2698 diff_populate_filespec(p->two, CHECK_SIZE_ONLY);
2699 copied = 0;
2700 added = p->two->size;
2701 diff_free_filespec_data(p->two);
2702 } else
2703 continue;
2704
2705 /*
2706 * Original minus copied is the removed material,
2707 * added is the new material. They are both damages
2708 * made to the preimage.
2709 * If the resulting damage is zero, we know that
2710 * diffcore_count_changes() considers the two entries to
2711 * be identical, but since content_changed is true, we
2712 * know that there must have been _some_ kind of change,
2713 * so we force all entries to have damage > 0.
2714 */
2715 damage = (p->one->size - copied) + added;
2716 if (!damage)
2717 damage = 1;
2718
2719 found_damage:
2720 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
2721 dir.files[dir.nr].name = name;
2722 dir.files[dir.nr].changed = damage;
2723 changed += damage;
2724 dir.nr++;
2725 }
2726
2727 /* This can happen even with many files, if everything was renames */
2728 if (!changed)
2729 return;
2730
2731 /* Show all directories with more than x% of the changes */
2732 QSORT(dir.files, dir.nr, dirstat_compare);
2733 gather_dirstat(options, &dir, changed, "", 0);
2734 }
2735
2736 static void show_dirstat_by_line(struct diffstat_t *data, struct diff_options *options)
2737 {
2738 int i;
2739 unsigned long changed;
2740 struct dirstat_dir dir;
2741
2742 if (data->nr == 0)
2743 return;
2744
2745 dir.files = NULL;
2746 dir.alloc = 0;
2747 dir.nr = 0;
2748 dir.permille = options->dirstat_permille;
2749 dir.cumulative = options->flags.dirstat_cumulative;
2750
2751 changed = 0;
2752 for (i = 0; i < data->nr; i++) {
2753 struct diffstat_file *file = data->files[i];
2754 unsigned long damage = file->added + file->deleted;
2755 if (file->is_binary)
2756 /*
2757 * binary files counts bytes, not lines. Must find some
2758 * way to normalize binary bytes vs. textual lines.
2759 * The following heuristic assumes that there are 64
2760 * bytes per "line".
2761 * This is stupid and ugly, but very cheap...
2762 */
2763 damage = DIV_ROUND_UP(damage, 64);
2764 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
2765 dir.files[dir.nr].name = file->name;
2766 dir.files[dir.nr].changed = damage;
2767 changed += damage;
2768 dir.nr++;
2769 }
2770
2771 /* This can happen even with many files, if everything was renames */
2772 if (!changed)
2773 return;
2774
2775 /* Show all directories with more than x% of the changes */
2776 QSORT(dir.files, dir.nr, dirstat_compare);
2777 gather_dirstat(options, &dir, changed, "", 0);
2778 }
2779
2780 static void free_diffstat_info(struct diffstat_t *diffstat)
2781 {
2782 int i;
2783 for (i = 0; i < diffstat->nr; i++) {
2784 struct diffstat_file *f = diffstat->files[i];
2785 free(f->print_name);
2786 free(f->name);
2787 free(f->from_name);
2788 free(f);
2789 }
2790 free(diffstat->files);
2791 }
2792
2793 struct checkdiff_t {
2794 const char *filename;
2795 int lineno;
2796 int conflict_marker_size;
2797 struct diff_options *o;
2798 unsigned ws_rule;
2799 unsigned status;
2800 };
2801
2802 static int is_conflict_marker(const char *line, int marker_size, unsigned long len)
2803 {
2804 char firstchar;
2805 int cnt;
2806
2807 if (len < marker_size + 1)
2808 return 0;
2809 firstchar = line[0];
2810 switch (firstchar) {
2811 case '=': case '>': case '<': case '|':
2812 break;
2813 default:
2814 return 0;
2815 }
2816 for (cnt = 1; cnt < marker_size; cnt++)
2817 if (line[cnt] != firstchar)
2818 return 0;
2819 /* line[1] thru line[marker_size-1] are same as firstchar */
2820 if (len < marker_size + 1 || !isspace(line[marker_size]))
2821 return 0;
2822 return 1;
2823 }
2824
2825 static void checkdiff_consume(void *priv, char *line, unsigned long len)
2826 {
2827 struct checkdiff_t *data = priv;
2828 int marker_size = data->conflict_marker_size;
2829 const char *ws = diff_get_color(data->o->use_color, DIFF_WHITESPACE);
2830 const char *reset = diff_get_color(data->o->use_color, DIFF_RESET);
2831 const char *set = diff_get_color(data->o->use_color, DIFF_FILE_NEW);
2832 char *err;
2833 const char *line_prefix;
2834
2835 assert(data->o);
2836 line_prefix = diff_line_prefix(data->o);
2837
2838 if (line[0] == '+') {
2839 unsigned bad;
2840 data->lineno++;
2841 if (is_conflict_marker(line + 1, marker_size, len - 1)) {
2842 data->status |= 1;
2843 fprintf(data->o->file,
2844 "%s%s:%d: leftover conflict marker\n",
2845 line_prefix, data->filename, data->lineno);
2846 }
2847 bad = ws_check(line + 1, len - 1, data->ws_rule);
2848 if (!bad)
2849 return;
2850 data->status |= bad;
2851 err = whitespace_error_string(bad);
2852 fprintf(data->o->file, "%s%s:%d: %s.\n",
2853 line_prefix, data->filename, data->lineno, err);
2854 free(err);
2855 emit_line(data->o, set, reset, line, 1);
2856 ws_check_emit(line + 1, len - 1, data->ws_rule,
2857 data->o->file, set, reset, ws);
2858 } else if (line[0] == ' ') {
2859 data->lineno++;
2860 } else if (line[0] == '@') {
2861 char *plus = strchr(line, '+');
2862 if (plus)
2863 data->lineno = strtol(plus, NULL, 10) - 1;
2864 else
2865 die("invalid diff");
2866 }
2867 }
2868
2869 static unsigned char *deflate_it(char *data,
2870 unsigned long size,
2871 unsigned long *result_size)
2872 {
2873 int bound;
2874 unsigned char *deflated;
2875 git_zstream stream;
2876
2877 git_deflate_init(&stream, zlib_compression_level);
2878 bound = git_deflate_bound(&stream, size);
2879 deflated = xmalloc(bound);
2880 stream.next_out = deflated;
2881 stream.avail_out = bound;
2882
2883 stream.next_in = (unsigned char *)data;
2884 stream.avail_in = size;
2885 while (git_deflate(&stream, Z_FINISH) == Z_OK)
2886 ; /* nothing */
2887 git_deflate_end(&stream);
2888 *result_size = stream.total_out;
2889 return deflated;
2890 }
2891
2892 static void emit_binary_diff_body(struct diff_options *o,
2893 mmfile_t *one, mmfile_t *two)
2894 {
2895 void *cp;
2896 void *delta;
2897 void *deflated;
2898 void *data;
2899 unsigned long orig_size;
2900 unsigned long delta_size;
2901 unsigned long deflate_size;
2902 unsigned long data_size;
2903
2904 /* We could do deflated delta, or we could do just deflated two,
2905 * whichever is smaller.
2906 */
2907 delta = NULL;
2908 deflated = deflate_it(two->ptr, two->size, &deflate_size);
2909 if (one->size && two->size) {
2910 delta = diff_delta(one->ptr, one->size,
2911 two->ptr, two->size,
2912 &delta_size, deflate_size);
2913 if (delta) {
2914 void *to_free = delta;
2915 orig_size = delta_size;
2916 delta = deflate_it(delta, delta_size, &delta_size);
2917 free(to_free);
2918 }
2919 }
2920
2921 if (delta && delta_size < deflate_size) {
2922 char *s = xstrfmt("%lu", orig_size);
2923 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_HEADER_DELTA,
2924 s, strlen(s), 0);
2925 free(s);
2926 free(deflated);
2927 data = delta;
2928 data_size = delta_size;
2929 } else {
2930 char *s = xstrfmt("%lu", two->size);
2931 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_HEADER_LITERAL,
2932 s, strlen(s), 0);
2933 free(s);
2934 free(delta);
2935 data = deflated;
2936 data_size = deflate_size;
2937 }
2938
2939 /* emit data encoded in base85 */
2940 cp = data;
2941 while (data_size) {
2942 int len;
2943 int bytes = (52 < data_size) ? 52 : data_size;
2944 char line[71];
2945 data_size -= bytes;
2946 if (bytes <= 26)
2947 line[0] = bytes + 'A' - 1;
2948 else
2949 line[0] = bytes - 26 + 'a' - 1;
2950 encode_85(line + 1, cp, bytes);
2951 cp = (char *) cp + bytes;
2952
2953 len = strlen(line);
2954 line[len++] = '\n';
2955 line[len] = '\0';
2956
2957 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_BODY,
2958 line, len, 0);
2959 }
2960 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_FOOTER, NULL, 0, 0);
2961 free(data);
2962 }
2963
2964 static void emit_binary_diff(struct diff_options *o,
2965 mmfile_t *one, mmfile_t *two)
2966 {
2967 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_HEADER, NULL, 0, 0);
2968 emit_binary_diff_body(o, one, two);
2969 emit_binary_diff_body(o, two, one);
2970 }
2971
2972 int diff_filespec_is_binary(struct diff_filespec *one)
2973 {
2974 if (one->is_binary == -1) {
2975 diff_filespec_load_driver(one);
2976 if (one->driver->binary != -1)
2977 one->is_binary = one->driver->binary;
2978 else {
2979 if (!one->data && DIFF_FILE_VALID(one))
2980 diff_populate_filespec(one, CHECK_BINARY);
2981 if (one->is_binary == -1 && one->data)
2982 one->is_binary = buffer_is_binary(one->data,
2983 one->size);
2984 if (one->is_binary == -1)
2985 one->is_binary = 0;
2986 }
2987 }
2988 return one->is_binary;
2989 }
2990
2991 static const struct userdiff_funcname *diff_funcname_pattern(struct diff_filespec *one)
2992 {
2993 diff_filespec_load_driver(one);
2994 return one->driver->funcname.pattern ? &one->driver->funcname : NULL;
2995 }
2996
2997 void diff_set_mnemonic_prefix(struct diff_options *options, const char *a, const char *b)
2998 {
2999 if (!options->a_prefix)
3000 options->a_prefix = a;
3001 if (!options->b_prefix)
3002 options->b_prefix = b;
3003 }
3004
3005 struct userdiff_driver *get_textconv(struct diff_filespec *one)
3006 {
3007 if (!DIFF_FILE_VALID(one))
3008 return NULL;
3009
3010 diff_filespec_load_driver(one);
3011 return userdiff_get_textconv(one->driver);
3012 }
3013
3014 static void builtin_diff(const char *name_a,
3015 const char *name_b,
3016 struct diff_filespec *one,
3017 struct diff_filespec *two,
3018 const char *xfrm_msg,
3019 int must_show_header,
3020 struct diff_options *o,
3021 int complete_rewrite)
3022 {
3023 mmfile_t mf1, mf2;
3024 const char *lbl[2];
3025 char *a_one, *b_two;
3026 const char *meta = diff_get_color_opt(o, DIFF_METAINFO);
3027 const char *reset = diff_get_color_opt(o, DIFF_RESET);
3028 const char *a_prefix, *b_prefix;
3029 struct userdiff_driver *textconv_one = NULL;
3030 struct userdiff_driver *textconv_two = NULL;
3031 struct strbuf header = STRBUF_INIT;
3032 const char *line_prefix = diff_line_prefix(o);
3033
3034 diff_set_mnemonic_prefix(o, "a/", "b/");
3035 if (o->flags.reverse_diff) {
3036 a_prefix = o->b_prefix;
3037 b_prefix = o->a_prefix;
3038 } else {
3039 a_prefix = o->a_prefix;
3040 b_prefix = o->b_prefix;
3041 }
3042
3043 if (o->submodule_format == DIFF_SUBMODULE_LOG &&
3044 (!one->mode || S_ISGITLINK(one->mode)) &&
3045 (!two->mode || S_ISGITLINK(two->mode))) {
3046 show_submodule_summary(o, one->path ? one->path : two->path,
3047 &one->oid, &two->oid,
3048 two->dirty_submodule);
3049 return;
3050 } else if (o->submodule_format == DIFF_SUBMODULE_INLINE_DIFF &&
3051 (!one->mode || S_ISGITLINK(one->mode)) &&
3052 (!two->mode || S_ISGITLINK(two->mode))) {
3053 show_submodule_inline_diff(o, one->path ? one->path : two->path,
3054 &one->oid, &two->oid,
3055 two->dirty_submodule);
3056 return;
3057 }
3058
3059 if (o->flags.allow_textconv) {
3060 textconv_one = get_textconv(one);
3061 textconv_two = get_textconv(two);
3062 }
3063
3064 /* Never use a non-valid filename anywhere if at all possible */
3065 name_a = DIFF_FILE_VALID(one) ? name_a : name_b;
3066 name_b = DIFF_FILE_VALID(two) ? name_b : name_a;
3067
3068 a_one = quote_two(a_prefix, name_a + (*name_a == '/'));
3069 b_two = quote_two(b_prefix, name_b + (*name_b == '/'));
3070 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
3071 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
3072 strbuf_addf(&header, "%s%sdiff --git %s %s%s\n", line_prefix, meta, a_one, b_two, reset);
3073 if (lbl[0][0] == '/') {
3074 /* /dev/null */
3075 strbuf_addf(&header, "%s%snew file mode %06o%s\n", line_prefix, meta, two->mode, reset);
3076 if (xfrm_msg)
3077 strbuf_addstr(&header, xfrm_msg);
3078 must_show_header = 1;
3079 }
3080 else if (lbl[1][0] == '/') {
3081 strbuf_addf(&header, "%s%sdeleted file mode %06o%s\n", line_prefix, meta, one->mode, reset);
3082 if (xfrm_msg)
3083 strbuf_addstr(&header, xfrm_msg);
3084 must_show_header = 1;
3085 }
3086 else {
3087 if (one->mode != two->mode) {
3088 strbuf_addf(&header, "%s%sold mode %06o%s\n", line_prefix, meta, one->mode, reset);
3089 strbuf_addf(&header, "%s%snew mode %06o%s\n", line_prefix, meta, two->mode, reset);
3090 must_show_header = 1;
3091 }
3092 if (xfrm_msg)
3093 strbuf_addstr(&header, xfrm_msg);
3094
3095 /*
3096 * we do not run diff between different kind
3097 * of objects.
3098 */
3099 if ((one->mode ^ two->mode) & S_IFMT)
3100 goto free_ab_and_return;
3101 if (complete_rewrite &&
3102 (textconv_one || !diff_filespec_is_binary(one)) &&
3103 (textconv_two || !diff_filespec_is_binary(two))) {
3104 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
3105 header.buf, header.len, 0);
3106 strbuf_reset(&header);
3107 emit_rewrite_diff(name_a, name_b, one, two,
3108 textconv_one, textconv_two, o);
3109 o->found_changes = 1;
3110 goto free_ab_and_return;
3111 }
3112 }
3113
3114 if (o->irreversible_delete && lbl[1][0] == '/') {
3115 emit_diff_symbol(o, DIFF_SYMBOL_HEADER, header.buf,
3116 header.len, 0);
3117 strbuf_reset(&header);
3118 goto free_ab_and_return;
3119 } else if (!o->flags.text &&
3120 ( (!textconv_one && diff_filespec_is_binary(one)) ||
3121 (!textconv_two && diff_filespec_is_binary(two)) )) {
3122 struct strbuf sb = STRBUF_INIT;
3123 if (!one->data && !two->data &&
3124 S_ISREG(one->mode) && S_ISREG(two->mode) &&
3125 !o->flags.binary) {
3126 if (!oidcmp(&one->oid, &two->oid)) {
3127 if (must_show_header)
3128 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
3129 header.buf, header.len,
3130 0);
3131 goto free_ab_and_return;
3132 }
3133 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
3134 header.buf, header.len, 0);
3135 strbuf_addf(&sb, "%sBinary files %s and %s differ\n",
3136 diff_line_prefix(o), lbl[0], lbl[1]);
3137 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_FILES,
3138 sb.buf, sb.len, 0);
3139 strbuf_release(&sb);
3140 goto free_ab_and_return;
3141 }
3142 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
3143 die("unable to read files to diff");
3144 /* Quite common confusing case */
3145 if (mf1.size == mf2.size &&
3146 !memcmp(mf1.ptr, mf2.ptr, mf1.size)) {
3147 if (must_show_header)
3148 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
3149 header.buf, header.len, 0);
3150 goto free_ab_and_return;
3151 }
3152 emit_diff_symbol(o, DIFF_SYMBOL_HEADER, header.buf, header.len, 0);
3153 strbuf_reset(&header);
3154 if (o->flags.binary)
3155 emit_binary_diff(o, &mf1, &mf2);
3156 else {
3157 strbuf_addf(&sb, "%sBinary files %s and %s differ\n",
3158 diff_line_prefix(o), lbl[0], lbl[1]);
3159 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_FILES,
3160 sb.buf, sb.len, 0);
3161 strbuf_release(&sb);
3162 }
3163 o->found_changes = 1;
3164 } else {
3165 /* Crazy xdl interfaces.. */
3166 const char *diffopts = getenv("GIT_DIFF_OPTS");
3167 const char *v;
3168 xpparam_t xpp;
3169 xdemitconf_t xecfg;
3170 struct emit_callback ecbdata;
3171 const struct userdiff_funcname *pe;
3172
3173 if (must_show_header) {
3174 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
3175 header.buf, header.len, 0);
3176 strbuf_reset(&header);
3177 }
3178
3179 mf1.size = fill_textconv(textconv_one, one, &mf1.ptr);
3180 mf2.size = fill_textconv(textconv_two, two, &mf2.ptr);
3181
3182 pe = diff_funcname_pattern(one);
3183 if (!pe)
3184 pe = diff_funcname_pattern(two);
3185
3186 memset(&xpp, 0, sizeof(xpp));
3187 memset(&xecfg, 0, sizeof(xecfg));
3188 memset(&ecbdata, 0, sizeof(ecbdata));
3189 ecbdata.label_path = lbl;
3190 ecbdata.color_diff = want_color(o->use_color);
3191 ecbdata.ws_rule = whitespace_rule(name_b);
3192 if (ecbdata.ws_rule & WS_BLANK_AT_EOF)
3193 check_blank_at_eof(&mf1, &mf2, &ecbdata);
3194 ecbdata.opt = o;
3195 ecbdata.header = header.len ? &header : NULL;
3196 xpp.flags = o->xdl_opts;
3197 xpp.anchors = o->anchors;
3198 xpp.anchors_nr = o->anchors_nr;
3199 xecfg.ctxlen = o->context;
3200 xecfg.interhunkctxlen = o->interhunkcontext;
3201 xecfg.flags = XDL_EMIT_FUNCNAMES;
3202 if (o->flags.funccontext)
3203 xecfg.flags |= XDL_EMIT_FUNCCONTEXT;
3204 if (pe)
3205 xdiff_set_find_func(&xecfg, pe->pattern, pe->cflags);
3206 if (!diffopts)
3207 ;
3208 else if (skip_prefix(diffopts, "--unified=", &v))
3209 xecfg.ctxlen = strtoul(v, NULL, 10);
3210 else if (skip_prefix(diffopts, "-u", &v))
3211 xecfg.ctxlen = strtoul(v, NULL, 10);
3212 if (o->word_diff)
3213 init_diff_words_data(&ecbdata, o, one, two);
3214 if (xdi_diff_outf(&mf1, &mf2, fn_out_consume, &ecbdata,
3215 &xpp, &xecfg))
3216 die("unable to generate diff for %s", one->path);
3217 if (o->word_diff)
3218 free_diff_words_data(&ecbdata);
3219 if (textconv_one)
3220 free(mf1.ptr);
3221 if (textconv_two)
3222 free(mf2.ptr);
3223 xdiff_clear_find_func(&xecfg);
3224 }
3225
3226 free_ab_and_return:
3227 strbuf_release(&header);
3228 diff_free_filespec_data(one);
3229 diff_free_filespec_data(two);
3230 free(a_one);
3231 free(b_two);
3232 return;
3233 }
3234
3235 static char *get_compact_summary(const struct diff_filepair *p, int is_renamed)
3236 {
3237 if (!is_renamed) {
3238 if (p->status == DIFF_STATUS_ADDED) {
3239 if (S_ISLNK(p->two->mode))
3240 return "new +l";
3241 else if ((p->two->mode & 0777) == 0755)
3242 return "new +x";
3243 else
3244 return "new";
3245 } else if (p->status == DIFF_STATUS_DELETED)
3246 return "gone";
3247 }
3248 if (S_ISLNK(p->one->mode) && !S_ISLNK(p->two->mode))
3249 return "mode -l";
3250 else if (!S_ISLNK(p->one->mode) && S_ISLNK(p->two->mode))
3251 return "mode +l";
3252 else if ((p->one->mode & 0777) == 0644 &&
3253 (p->two->mode & 0777) == 0755)
3254 return "mode +x";
3255 else if ((p->one->mode & 0777) == 0755 &&
3256 (p->two->mode & 0777) == 0644)
3257 return "mode -x";
3258 return NULL;
3259 }
3260
3261 static void builtin_diffstat(const char *name_a, const char *name_b,
3262 struct diff_filespec *one,
3263 struct diff_filespec *two,
3264 struct diffstat_t *diffstat,
3265 struct diff_options *o,
3266 struct diff_filepair *p)
3267 {
3268 mmfile_t mf1, mf2;
3269 struct diffstat_file *data;
3270 int same_contents;
3271 int complete_rewrite = 0;
3272
3273 if (!DIFF_PAIR_UNMERGED(p)) {
3274 if (p->status == DIFF_STATUS_MODIFIED && p->score)
3275 complete_rewrite = 1;
3276 }
3277
3278 data = diffstat_add(diffstat, name_a, name_b);
3279 data->is_interesting = p->status != DIFF_STATUS_UNKNOWN;
3280 if (o->flags.stat_with_summary)
3281 data->comments = get_compact_summary(p, data->is_renamed);
3282
3283 if (!one || !two) {
3284 data->is_unmerged = 1;
3285 return;
3286 }
3287
3288 same_contents = !oidcmp(&one->oid, &two->oid);
3289
3290 if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
3291 data->is_binary = 1;
3292 if (same_contents) {
3293 data->added = 0;
3294 data->deleted = 0;
3295 } else {
3296 data->added = diff_filespec_size(two);
3297 data->deleted = diff_filespec_size(one);
3298 }
3299 }
3300
3301 else if (complete_rewrite) {
3302 diff_populate_filespec(one, 0);
3303 diff_populate_filespec(two, 0);
3304 data->deleted = count_lines(one->data, one->size);
3305 data->added = count_lines(two->data, two->size);
3306 }
3307
3308 else if (!same_contents) {
3309 /* Crazy xdl interfaces.. */
3310 xpparam_t xpp;
3311 xdemitconf_t xecfg;
3312
3313 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
3314 die("unable to read files to diff");
3315
3316 memset(&xpp, 0, sizeof(xpp));
3317 memset(&xecfg, 0, sizeof(xecfg));
3318 xpp.flags = o->xdl_opts;
3319 xpp.anchors = o->anchors;
3320 xpp.anchors_nr = o->anchors_nr;
3321 xecfg.ctxlen = o->context;
3322 xecfg.interhunkctxlen = o->interhunkcontext;
3323 if (xdi_diff_outf(&mf1, &mf2, diffstat_consume, diffstat,
3324 &xpp, &xecfg))
3325 die("unable to generate diffstat for %s", one->path);
3326 }
3327
3328 diff_free_filespec_data(one);
3329 diff_free_filespec_data(two);
3330 }
3331
3332 static void builtin_checkdiff(const char *name_a, const char *name_b,
3333 const char *attr_path,
3334 struct diff_filespec *one,
3335 struct diff_filespec *two,
3336 struct diff_options *o)
3337 {
3338 mmfile_t mf1, mf2;
3339 struct checkdiff_t data;
3340
3341 if (!two)
3342 return;
3343
3344 memset(&data, 0, sizeof(data));
3345 data.filename = name_b ? name_b : name_a;
3346 data.lineno = 0;
3347 data.o = o;
3348 data.ws_rule = whitespace_rule(attr_path);
3349 data.conflict_marker_size = ll_merge_marker_size(attr_path);
3350
3351 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
3352 die("unable to read files to diff");
3353
3354 /*
3355 * All the other codepaths check both sides, but not checking
3356 * the "old" side here is deliberate. We are checking the newly
3357 * introduced changes, and as long as the "new" side is text, we
3358 * can and should check what it introduces.
3359 */
3360 if (diff_filespec_is_binary(two))
3361 goto free_and_return;
3362 else {
3363 /* Crazy xdl interfaces.. */
3364 xpparam_t xpp;
3365 xdemitconf_t xecfg;
3366
3367 memset(&xpp, 0, sizeof(xpp));
3368 memset(&xecfg, 0, sizeof(xecfg));
3369 xecfg.ctxlen = 1; /* at least one context line */
3370 xpp.flags = 0;
3371 if (xdi_diff_outf(&mf1, &mf2, checkdiff_consume, &data,
3372 &xpp, &xecfg))
3373 die("unable to generate checkdiff for %s", one->path);
3374
3375 if (data.ws_rule & WS_BLANK_AT_EOF) {
3376 struct emit_callback ecbdata;
3377 int blank_at_eof;
3378
3379 ecbdata.ws_rule = data.ws_rule;
3380 check_blank_at_eof(&mf1, &mf2, &ecbdata);
3381 blank_at_eof = ecbdata.blank_at_eof_in_postimage;
3382
3383 if (blank_at_eof) {
3384 static char *err;
3385 if (!err)
3386 err = whitespace_error_string(WS_BLANK_AT_EOF);
3387 fprintf(o->file, "%s:%d: %s.\n",
3388 data.filename, blank_at_eof, err);
3389 data.status = 1; /* report errors */
3390 }
3391 }
3392 }
3393 free_and_return:
3394 diff_free_filespec_data(one);
3395 diff_free_filespec_data(two);
3396 if (data.status)
3397 o->flags.check_failed = 1;
3398 }
3399
3400 struct diff_filespec *alloc_filespec(const char *path)
3401 {
3402 struct diff_filespec *spec;
3403
3404 FLEXPTR_ALLOC_STR(spec, path, path);
3405 spec->count = 1;
3406 spec->is_binary = -1;
3407 return spec;
3408 }
3409
3410 void free_filespec(struct diff_filespec *spec)
3411 {
3412 if (!--spec->count) {
3413 diff_free_filespec_data(spec);
3414 free(spec);
3415 }
3416 }
3417
3418 void fill_filespec(struct diff_filespec *spec, const struct object_id *oid,
3419 int oid_valid, unsigned short mode)
3420 {
3421 if (mode) {
3422 spec->mode = canon_mode(mode);
3423 oidcpy(&spec->oid, oid);
3424 spec->oid_valid = oid_valid;
3425 }
3426 }
3427
3428 /*
3429 * Given a name and sha1 pair, if the index tells us the file in
3430 * the work tree has that object contents, return true, so that
3431 * prepare_temp_file() does not have to inflate and extract.
3432 */
3433 static int reuse_worktree_file(const char *name, const struct object_id *oid, int want_file)
3434 {
3435 const struct cache_entry *ce;
3436 struct stat st;
3437 int pos, len;
3438
3439 /*
3440 * We do not read the cache ourselves here, because the
3441 * benchmark with my previous version that always reads cache
3442 * shows that it makes things worse for diff-tree comparing
3443 * two linux-2.6 kernel trees in an already checked out work
3444 * tree. This is because most diff-tree comparisons deal with
3445 * only a small number of files, while reading the cache is
3446 * expensive for a large project, and its cost outweighs the
3447 * savings we get by not inflating the object to a temporary
3448 * file. Practically, this code only helps when we are used
3449 * by diff-cache --cached, which does read the cache before
3450 * calling us.
3451 */
3452 if (!active_cache)
3453 return 0;
3454
3455 /* We want to avoid the working directory if our caller
3456 * doesn't need the data in a normal file, this system
3457 * is rather slow with its stat/open/mmap/close syscalls,
3458 * and the object is contained in a pack file. The pack
3459 * is probably already open and will be faster to obtain
3460 * the data through than the working directory. Loose
3461 * objects however would tend to be slower as they need
3462 * to be individually opened and inflated.
3463 */
3464 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(oid->hash))
3465 return 0;
3466
3467 /*
3468 * Similarly, if we'd have to convert the file contents anyway, that
3469 * makes the optimization not worthwhile.
3470 */
3471 if (!want_file && would_convert_to_git(&the_index, name))
3472 return 0;
3473
3474 len = strlen(name);
3475 pos = cache_name_pos(name, len);
3476 if (pos < 0)
3477 return 0;
3478 ce = active_cache[pos];
3479
3480 /*
3481 * This is not the sha1 we are looking for, or
3482 * unreusable because it is not a regular file.
3483 */
3484 if (oidcmp(oid, &ce->oid) || !S_ISREG(ce->ce_mode))
3485 return 0;
3486
3487 /*
3488 * If ce is marked as "assume unchanged", there is no
3489 * guarantee that work tree matches what we are looking for.
3490 */
3491 if ((ce->ce_flags & CE_VALID) || ce_skip_worktree(ce))
3492 return 0;
3493
3494 /*
3495 * If ce matches the file in the work tree, we can reuse it.
3496 */
3497 if (ce_uptodate(ce) ||
3498 (!lstat(name, &st) && !ce_match_stat(ce, &st, 0)))
3499 return 1;
3500
3501 return 0;
3502 }
3503
3504 static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
3505 {
3506 struct strbuf buf = STRBUF_INIT;
3507 char *dirty = "";
3508
3509 /* Are we looking at the work tree? */
3510 if (s->dirty_submodule)
3511 dirty = "-dirty";
3512
3513 strbuf_addf(&buf, "Subproject commit %s%s\n",
3514 oid_to_hex(&s->oid), dirty);
3515 s->size = buf.len;
3516 if (size_only) {
3517 s->data = NULL;
3518 strbuf_release(&buf);
3519 } else {
3520 s->data = strbuf_detach(&buf, NULL);
3521 s->should_free = 1;
3522 }
3523 return 0;
3524 }
3525
3526 /*
3527 * While doing rename detection and pickaxe operation, we may need to
3528 * grab the data for the blob (or file) for our own in-core comparison.
3529 * diff_filespec has data and size fields for this purpose.
3530 */
3531 int diff_populate_filespec(struct diff_filespec *s, unsigned int flags)
3532 {
3533 int size_only = flags & CHECK_SIZE_ONLY;
3534 int err = 0;
3535 int conv_flags = global_conv_flags_eol;
3536 /*
3537 * demote FAIL to WARN to allow inspecting the situation
3538 * instead of refusing.
3539 */
3540 if (conv_flags & CONV_EOL_RNDTRP_DIE)
3541 conv_flags = CONV_EOL_RNDTRP_WARN;
3542
3543 if (!DIFF_FILE_VALID(s))
3544 die("internal error: asking to populate invalid file.");
3545 if (S_ISDIR(s->mode))
3546 return -1;
3547
3548 if (s->data)
3549 return 0;
3550
3551 if (size_only && 0 < s->size)
3552 return 0;
3553
3554 if (S_ISGITLINK(s->mode))
3555 return diff_populate_gitlink(s, size_only);
3556
3557 if (!s->oid_valid ||
3558 reuse_worktree_file(s->path, &s->oid, 0)) {
3559 struct strbuf buf = STRBUF_INIT;
3560 struct stat st;
3561 int fd;
3562
3563 if (lstat(s->path, &st) < 0) {
3564 err_empty:
3565 err = -1;
3566 empty:
3567 s->data = (char *)"";
3568 s->size = 0;
3569 return err;
3570 }
3571 s->size = xsize_t(st.st_size);
3572 if (!s->size)
3573 goto empty;
3574 if (S_ISLNK(st.st_mode)) {
3575 struct strbuf sb = STRBUF_INIT;
3576
3577 if (strbuf_readlink(&sb, s->path, s->size))
3578 goto err_empty;
3579 s->size = sb.len;
3580 s->data = strbuf_detach(&sb, NULL);
3581 s->should_free = 1;
3582 return 0;
3583 }
3584
3585 /*
3586 * Even if the caller would be happy with getting
3587 * only the size, we cannot return early at this
3588 * point if the path requires us to run the content
3589 * conversion.
3590 */
3591 if (size_only && !would_convert_to_git(&the_index, s->path))
3592 return 0;
3593
3594 /*
3595 * Note: this check uses xsize_t(st.st_size) that may
3596 * not be the true size of the blob after it goes
3597 * through convert_to_git(). This may not strictly be
3598 * correct, but the whole point of big_file_threshold
3599 * and is_binary check being that we want to avoid
3600 * opening the file and inspecting the contents, this
3601 * is probably fine.
3602 */
3603 if ((flags & CHECK_BINARY) &&
3604 s->size > big_file_threshold && s->is_binary == -1) {
3605 s->is_binary = 1;
3606 return 0;
3607 }
3608 fd = open(s->path, O_RDONLY);
3609 if (fd < 0)
3610 goto err_empty;
3611 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
3612 close(fd);
3613 s->should_munmap = 1;
3614
3615 /*
3616 * Convert from working tree format to canonical git format
3617 */
3618 if (convert_to_git(&the_index, s->path, s->data, s->size, &buf, conv_flags)) {
3619 size_t size = 0;
3620 munmap(s->data, s->size);
3621 s->should_munmap = 0;
3622 s->data = strbuf_detach(&buf, &size);
3623 s->size = size;
3624 s->should_free = 1;
3625 }
3626 }
3627 else {
3628 enum object_type type;
3629 if (size_only || (flags & CHECK_BINARY)) {
3630 type = oid_object_info(the_repository, &s->oid,
3631 &s->size);
3632 if (type < 0)
3633 die("unable to read %s",
3634 oid_to_hex(&s->oid));
3635 if (size_only)
3636 return 0;
3637 if (s->size > big_file_threshold && s->is_binary == -1) {
3638 s->is_binary = 1;
3639 return 0;
3640 }
3641 }
3642 s->data = read_object_file(&s->oid, &type, &s->size);
3643 if (!s->data)
3644 die("unable to read %s", oid_to_hex(&s->oid));
3645 s->should_free = 1;
3646 }
3647 return 0;
3648 }
3649
3650 void diff_free_filespec_blob(struct diff_filespec *s)
3651 {
3652 if (s->should_free)
3653 free(s->data);
3654 else if (s->should_munmap)
3655 munmap(s->data, s->size);
3656
3657 if (s->should_free || s->should_munmap) {
3658 s->should_free = s->should_munmap = 0;
3659 s->data = NULL;
3660 }
3661 }
3662
3663 void diff_free_filespec_data(struct diff_filespec *s)
3664 {
3665 diff_free_filespec_blob(s);
3666 FREE_AND_NULL(s->cnt_data);
3667 }
3668
3669 static void prep_temp_blob(const char *path, struct diff_tempfile *temp,
3670 void *blob,
3671 unsigned long size,
3672 const struct object_id *oid,
3673 int mode)
3674 {
3675 struct strbuf buf = STRBUF_INIT;
3676 struct strbuf tempfile = STRBUF_INIT;
3677 char *path_dup = xstrdup(path);
3678 const char *base = basename(path_dup);
3679
3680 /* Generate "XXXXXX_basename.ext" */
3681 strbuf_addstr(&tempfile, "XXXXXX_");
3682 strbuf_addstr(&tempfile, base);
3683
3684 temp->tempfile = mks_tempfile_ts(tempfile.buf, strlen(base) + 1);
3685 if (!temp->tempfile)
3686 die_errno("unable to create temp-file");
3687 if (convert_to_working_tree(path,
3688 (const char *)blob, (size_t)size, &buf)) {
3689 blob = buf.buf;
3690 size = buf.len;
3691 }
3692 if (write_in_full(temp->tempfile->fd, blob, size) < 0 ||
3693 close_tempfile_gently(temp->tempfile))
3694 die_errno("unable to write temp-file");
3695 temp->name = get_tempfile_path(temp->tempfile);
3696 oid_to_hex_r(temp->hex, oid);
3697 xsnprintf(temp->mode, sizeof(temp->mode), "%06o", mode);
3698 strbuf_release(&buf);
3699 strbuf_release(&tempfile);
3700 free(path_dup);
3701 }
3702
3703 static struct diff_tempfile *prepare_temp_file(const char *name,
3704 struct diff_filespec *one)
3705 {
3706 struct diff_tempfile *temp = claim_diff_tempfile();
3707
3708 if (!DIFF_FILE_VALID(one)) {
3709 not_a_valid_file:
3710 /* A '-' entry produces this for file-2, and
3711 * a '+' entry produces this for file-1.
3712 */
3713 temp->name = "/dev/null";
3714 xsnprintf(temp->hex, sizeof(temp->hex), ".");
3715 xsnprintf(temp->mode, sizeof(temp->mode), ".");
3716 return temp;
3717 }
3718
3719 if (!S_ISGITLINK(one->mode) &&
3720 (!one->oid_valid ||
3721 reuse_worktree_file(name, &one->oid, 1))) {
3722 struct stat st;
3723 if (lstat(name, &st) < 0) {
3724 if (errno == ENOENT)
3725 goto not_a_valid_file;
3726 die_errno("stat(%s)", name);
3727 }
3728 if (S_ISLNK(st.st_mode)) {
3729 struct strbuf sb = STRBUF_INIT;
3730 if (strbuf_readlink(&sb, name, st.st_size) < 0)
3731 die_errno("readlink(%s)", name);
3732 prep_temp_blob(name, temp, sb.buf, sb.len,
3733 (one->oid_valid ?
3734 &one->oid : &null_oid),
3735 (one->oid_valid ?
3736 one->mode : S_IFLNK));
3737 strbuf_release(&sb);
3738 }
3739 else {
3740 /* we can borrow from the file in the work tree */
3741 temp->name = name;
3742 if (!one->oid_valid)
3743 oid_to_hex_r(temp->hex, &null_oid);
3744 else
3745 oid_to_hex_r(temp->hex, &one->oid);
3746 /* Even though we may sometimes borrow the
3747 * contents from the work tree, we always want
3748 * one->mode. mode is trustworthy even when
3749 * !(one->oid_valid), as long as
3750 * DIFF_FILE_VALID(one).
3751 */
3752 xsnprintf(temp->mode, sizeof(temp->mode), "%06o", one->mode);
3753 }
3754 return temp;
3755 }
3756 else {
3757 if (diff_populate_filespec(one, 0))
3758 die("cannot read data blob for %s", one->path);
3759 prep_temp_blob(name, temp, one->data, one->size,
3760 &one->oid, one->mode);
3761 }
3762 return temp;
3763 }
3764
3765 static void add_external_diff_name(struct argv_array *argv,
3766 const char *name,
3767 struct diff_filespec *df)
3768 {
3769 struct diff_tempfile *temp = prepare_temp_file(name, df);
3770 argv_array_push(argv, temp->name);
3771 argv_array_push(argv, temp->hex);
3772 argv_array_push(argv, temp->mode);
3773 }
3774
3775 /* An external diff command takes:
3776 *
3777 * diff-cmd name infile1 infile1-sha1 infile1-mode \
3778 * infile2 infile2-sha1 infile2-mode [ rename-to ]
3779 *
3780 */
3781 static void run_external_diff(const char *pgm,
3782 const char *name,
3783 const char *other,
3784 struct diff_filespec *one,
3785 struct diff_filespec *two,
3786 const char *xfrm_msg,
3787 int complete_rewrite,
3788 struct diff_options *o)
3789 {
3790 struct argv_array argv = ARGV_ARRAY_INIT;
3791 struct argv_array env = ARGV_ARRAY_INIT;
3792 struct diff_queue_struct *q = &diff_queued_diff;
3793
3794 argv_array_push(&argv, pgm);
3795 argv_array_push(&argv, name);
3796
3797 if (one && two) {
3798 add_external_diff_name(&argv, name, one);
3799 if (!other)
3800 add_external_diff_name(&argv, name, two);
3801 else {
3802 add_external_diff_name(&argv, other, two);
3803 argv_array_push(&argv, other);
3804 argv_array_push(&argv, xfrm_msg);
3805 }
3806 }
3807
3808 argv_array_pushf(&env, "GIT_DIFF_PATH_COUNTER=%d", ++o->diff_path_counter);
3809 argv_array_pushf(&env, "GIT_DIFF_PATH_TOTAL=%d", q->nr);
3810
3811 if (run_command_v_opt_cd_env(argv.argv, RUN_USING_SHELL, NULL, env.argv))
3812 die(_("external diff died, stopping at %s"), name);
3813
3814 remove_tempfile();
3815 argv_array_clear(&argv);
3816 argv_array_clear(&env);
3817 }
3818
3819 static int similarity_index(struct diff_filepair *p)
3820 {
3821 return p->score * 100 / MAX_SCORE;
3822 }
3823
3824 static const char *diff_abbrev_oid(const struct object_id *oid, int abbrev)
3825 {
3826 if (startup_info->have_repository)
3827 return find_unique_abbrev(oid, abbrev);
3828 else {
3829 char *hex = oid_to_hex(oid);
3830 if (abbrev < 0)
3831 abbrev = FALLBACK_DEFAULT_ABBREV;
3832 if (abbrev > GIT_SHA1_HEXSZ)
3833 die("BUG: oid abbreviation out of range: %d", abbrev);
3834 if (abbrev)
3835 hex[abbrev] = '\0';
3836 return hex;
3837 }
3838 }
3839
3840 static void fill_metainfo(struct strbuf *msg,
3841 const char *name,
3842 const char *other,
3843 struct diff_filespec *one,
3844 struct diff_filespec *two,
3845 struct diff_options *o,
3846 struct diff_filepair *p,
3847 int *must_show_header,
3848 int use_color)
3849 {
3850 const char *set = diff_get_color(use_color, DIFF_METAINFO);
3851 const char *reset = diff_get_color(use_color, DIFF_RESET);
3852 const char *line_prefix = diff_line_prefix(o);
3853
3854 *must_show_header = 1;
3855 strbuf_init(msg, PATH_MAX * 2 + 300);
3856 switch (p->status) {
3857 case DIFF_STATUS_COPIED:
3858 strbuf_addf(msg, "%s%ssimilarity index %d%%",
3859 line_prefix, set, similarity_index(p));
3860 strbuf_addf(msg, "%s\n%s%scopy from ",
3861 reset, line_prefix, set);
3862 quote_c_style(name, msg, NULL, 0);
3863 strbuf_addf(msg, "%s\n%s%scopy to ", reset, line_prefix, set);
3864 quote_c_style(other, msg, NULL, 0);
3865 strbuf_addf(msg, "%s\n", reset);
3866 break;
3867 case DIFF_STATUS_RENAMED:
3868 strbuf_addf(msg, "%s%ssimilarity index %d%%",
3869 line_prefix, set, similarity_index(p));
3870 strbuf_addf(msg, "%s\n%s%srename from ",
3871 reset, line_prefix, set);
3872 quote_c_style(name, msg, NULL, 0);
3873 strbuf_addf(msg, "%s\n%s%srename to ",
3874 reset, line_prefix, set);
3875 quote_c_style(other, msg, NULL, 0);
3876 strbuf_addf(msg, "%s\n", reset);
3877 break;
3878 case DIFF_STATUS_MODIFIED:
3879 if (p->score) {
3880 strbuf_addf(msg, "%s%sdissimilarity index %d%%%s\n",
3881 line_prefix,
3882 set, similarity_index(p), reset);
3883 break;
3884 }
3885 /* fallthru */
3886 default:
3887 *must_show_header = 0;
3888 }
3889 if (one && two && oidcmp(&one->oid, &two->oid)) {
3890 int abbrev = o->flags.full_index ? 40 : DEFAULT_ABBREV;
3891
3892 if (o->flags.binary) {
3893 mmfile_t mf;
3894 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
3895 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
3896 abbrev = 40;
3897 }
3898 strbuf_addf(msg, "%s%sindex %s..%s", line_prefix, set,
3899 diff_abbrev_oid(&one->oid, abbrev),
3900 diff_abbrev_oid(&two->oid, abbrev));
3901 if (one->mode == two->mode)
3902 strbuf_addf(msg, " %06o", one->mode);
3903 strbuf_addf(msg, "%s\n", reset);
3904 }
3905 }
3906
3907 static void run_diff_cmd(const char *pgm,
3908 const char *name,
3909 const char *other,
3910 const char *attr_path,
3911 struct diff_filespec *one,
3912 struct diff_filespec *two,
3913 struct strbuf *msg,
3914 struct diff_options *o,
3915 struct diff_filepair *p)
3916 {
3917 const char *xfrm_msg = NULL;
3918 int complete_rewrite = (p->status == DIFF_STATUS_MODIFIED) && p->score;
3919 int must_show_header = 0;
3920
3921
3922 if (o->flags.allow_external) {
3923 struct userdiff_driver *drv = userdiff_find_by_path(attr_path);
3924 if (drv && drv->external)
3925 pgm = drv->external;
3926 }
3927
3928 if (msg) {
3929 /*
3930 * don't use colors when the header is intended for an
3931 * external diff driver
3932 */
3933 fill_metainfo(msg, name, other, one, two, o, p,
3934 &must_show_header,
3935 want_color(o->use_color) && !pgm);
3936 xfrm_msg = msg->len ? msg->buf : NULL;
3937 }
3938
3939 if (pgm) {
3940 run_external_diff(pgm, name, other, one, two, xfrm_msg,
3941 complete_rewrite, o);
3942 return;
3943 }
3944 if (one && two)
3945 builtin_diff(name, other ? other : name,
3946 one, two, xfrm_msg, must_show_header,
3947 o, complete_rewrite);
3948 else
3949 fprintf(o->file, "* Unmerged path %s\n", name);
3950 }
3951
3952 static void diff_fill_oid_info(struct diff_filespec *one)
3953 {
3954 if (DIFF_FILE_VALID(one)) {
3955 if (!one->oid_valid) {
3956 struct stat st;
3957 if (one->is_stdin) {
3958 oidclr(&one->oid);
3959 return;
3960 }
3961 if (lstat(one->path, &st) < 0)
3962 die_errno("stat '%s'", one->path);
3963 if (index_path(&one->oid, one->path, &st, 0))
3964 die("cannot hash %s", one->path);
3965 }
3966 }
3967 else
3968 oidclr(&one->oid);
3969 }
3970
3971 static void strip_prefix(int prefix_length, const char **namep, const char **otherp)
3972 {
3973 /* Strip the prefix but do not molest /dev/null and absolute paths */
3974 if (*namep && **namep != '/') {
3975 *namep += prefix_length;
3976 if (**namep == '/')
3977 ++*namep;
3978 }
3979 if (*otherp && **otherp != '/') {
3980 *otherp += prefix_length;
3981 if (**otherp == '/')
3982 ++*otherp;
3983 }
3984 }
3985
3986 static void run_diff(struct diff_filepair *p, struct diff_options *o)
3987 {
3988 const char *pgm = external_diff();
3989 struct strbuf msg;
3990 struct diff_filespec *one = p->one;
3991 struct diff_filespec *two = p->two;
3992 const char *name;
3993 const char *other;
3994 const char *attr_path;
3995
3996 name = one->path;
3997 other = (strcmp(name, two->path) ? two->path : NULL);
3998 attr_path = name;
3999 if (o->prefix_length)
4000 strip_prefix(o->prefix_length, &name, &other);
4001
4002 if (!o->flags.allow_external)
4003 pgm = NULL;
4004
4005 if (DIFF_PAIR_UNMERGED(p)) {
4006 run_diff_cmd(pgm, name, NULL, attr_path,
4007 NULL, NULL, NULL, o, p);
4008 return;
4009 }
4010
4011 diff_fill_oid_info(one);
4012 diff_fill_oid_info(two);
4013
4014 if (!pgm &&
4015 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
4016 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
4017 /*
4018 * a filepair that changes between file and symlink
4019 * needs to be split into deletion and creation.
4020 */
4021 struct diff_filespec *null = alloc_filespec(two->path);
4022 run_diff_cmd(NULL, name, other, attr_path,
4023 one, null, &msg, o, p);
4024 free(null);
4025 strbuf_release(&msg);
4026
4027 null = alloc_filespec(one->path);
4028 run_diff_cmd(NULL, name, other, attr_path,
4029 null, two, &msg, o, p);
4030 free(null);
4031 }
4032 else
4033 run_diff_cmd(pgm, name, other, attr_path,
4034 one, two, &msg, o, p);
4035
4036 strbuf_release(&msg);
4037 }
4038
4039 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
4040 struct diffstat_t *diffstat)
4041 {
4042 const char *name;
4043 const char *other;
4044
4045 if (DIFF_PAIR_UNMERGED(p)) {
4046 /* unmerged */
4047 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, p);
4048 return;
4049 }
4050
4051 name = p->one->path;
4052 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
4053
4054 if (o->prefix_length)
4055 strip_prefix(o->prefix_length, &name, &other);
4056
4057 diff_fill_oid_info(p->one);
4058 diff_fill_oid_info(p->two);
4059
4060 builtin_diffstat(name, other, p->one, p->two, diffstat, o, p);
4061 }
4062
4063 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
4064 {
4065 const char *name;
4066 const char *other;
4067 const char *attr_path;
4068
4069 if (DIFF_PAIR_UNMERGED(p)) {
4070 /* unmerged */
4071 return;
4072 }
4073
4074 name = p->one->path;
4075 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
4076 attr_path = other ? other : name;
4077
4078 if (o->prefix_length)
4079 strip_prefix(o->prefix_length, &name, &other);
4080
4081 diff_fill_oid_info(p->one);
4082 diff_fill_oid_info(p->two);
4083
4084 builtin_checkdiff(name, other, attr_path, p->one, p->two, o);
4085 }
4086
4087 void diff_setup(struct diff_options *options)
4088 {
4089 memcpy(options, &default_diff_options, sizeof(*options));
4090
4091 options->file = stdout;
4092
4093 options->abbrev = DEFAULT_ABBREV;
4094 options->line_termination = '\n';
4095 options->break_opt = -1;
4096 options->rename_limit = -1;
4097 options->dirstat_permille = diff_dirstat_permille_default;
4098 options->context = diff_context_default;
4099 options->interhunkcontext = diff_interhunk_context_default;
4100 options->ws_error_highlight = ws_error_highlight_default;
4101 options->flags.rename_empty = 1;
4102 options->objfind = NULL;
4103
4104 /* pathchange left =NULL by default */
4105 options->change = diff_change;
4106 options->add_remove = diff_addremove;
4107 options->use_color = diff_use_color_default;
4108 options->detect_rename = diff_detect_rename_default;
4109 options->xdl_opts |= diff_algorithm;
4110 if (diff_indent_heuristic)
4111 DIFF_XDL_SET(options, INDENT_HEURISTIC);
4112
4113 options->orderfile = diff_order_file_cfg;
4114
4115 if (diff_no_prefix) {
4116 options->a_prefix = options->b_prefix = "";
4117 } else if (!diff_mnemonic_prefix) {
4118 options->a_prefix = "a/";
4119 options->b_prefix = "b/";
4120 }
4121
4122 options->color_moved = diff_color_moved_default;
4123 }
4124
4125 void diff_setup_done(struct diff_options *options)
4126 {
4127 unsigned check_mask = DIFF_FORMAT_NAME |
4128 DIFF_FORMAT_NAME_STATUS |
4129 DIFF_FORMAT_CHECKDIFF |
4130 DIFF_FORMAT_NO_OUTPUT;
4131
4132 if (options->set_default)
4133 options->set_default(options);
4134
4135 if (HAS_MULTI_BITS(options->output_format & check_mask))
4136 die(_("--name-only, --name-status, --check and -s are mutually exclusive"));
4137
4138 if (HAS_MULTI_BITS(options->pickaxe_opts & DIFF_PICKAXE_KINDS_MASK))
4139 die(_("-G, -S and --find-object are mutually exclusive"));
4140
4141 /*
4142 * Most of the time we can say "there are changes"
4143 * only by checking if there are changed paths, but
4144 * --ignore-whitespace* options force us to look
4145 * inside contents.
4146 */
4147
4148 if ((options->xdl_opts & XDF_WHITESPACE_FLAGS))
4149 options->flags.diff_from_contents = 1;
4150 else
4151 options->flags.diff_from_contents = 0;
4152
4153 if (options->flags.find_copies_harder)
4154 options->detect_rename = DIFF_DETECT_COPY;
4155
4156 if (!options->flags.relative_name)
4157 options->prefix = NULL;
4158 if (options->prefix)
4159 options->prefix_length = strlen(options->prefix);
4160 else
4161 options->prefix_length = 0;
4162
4163 if (options->output_format & (DIFF_FORMAT_NAME |
4164 DIFF_FORMAT_NAME_STATUS |
4165 DIFF_FORMAT_CHECKDIFF |
4166 DIFF_FORMAT_NO_OUTPUT))
4167 options->output_format &= ~(DIFF_FORMAT_RAW |
4168 DIFF_FORMAT_NUMSTAT |
4169 DIFF_FORMAT_DIFFSTAT |
4170 DIFF_FORMAT_SHORTSTAT |
4171 DIFF_FORMAT_DIRSTAT |
4172 DIFF_FORMAT_SUMMARY |
4173 DIFF_FORMAT_PATCH);
4174
4175 /*
4176 * These cases always need recursive; we do not drop caller-supplied
4177 * recursive bits for other formats here.
4178 */
4179 if (options->output_format & (DIFF_FORMAT_PATCH |
4180 DIFF_FORMAT_NUMSTAT |
4181 DIFF_FORMAT_DIFFSTAT |
4182 DIFF_FORMAT_SHORTSTAT |
4183 DIFF_FORMAT_DIRSTAT |
4184 DIFF_FORMAT_SUMMARY |
4185 DIFF_FORMAT_CHECKDIFF))
4186 options->flags.recursive = 1;
4187 /*
4188 * Also pickaxe would not work very well if you do not say recursive
4189 */
4190 if (options->pickaxe_opts & DIFF_PICKAXE_KINDS_MASK)
4191 options->flags.recursive = 1;
4192 /*
4193 * When patches are generated, submodules diffed against the work tree
4194 * must be checked for dirtiness too so it can be shown in the output
4195 */
4196 if (options->output_format & DIFF_FORMAT_PATCH)
4197 options->flags.dirty_submodules = 1;
4198
4199 if (options->detect_rename && options->rename_limit < 0)
4200 options->rename_limit = diff_rename_limit_default;
4201 if (options->setup & DIFF_SETUP_USE_CACHE) {
4202 if (!active_cache)
4203 /* read-cache does not die even when it fails
4204 * so it is safe for us to do this here. Also
4205 * it does not smudge active_cache or active_nr
4206 * when it fails, so we do not have to worry about
4207 * cleaning it up ourselves either.
4208 */
4209 read_cache();
4210 }
4211 if (40 < options->abbrev)
4212 options->abbrev = 40; /* full */
4213
4214 /*
4215 * It does not make sense to show the first hit we happened
4216 * to have found. It does not make sense not to return with
4217 * exit code in such a case either.
4218 */
4219 if (options->flags.quick) {
4220 options->output_format = DIFF_FORMAT_NO_OUTPUT;
4221 options->flags.exit_with_status = 1;
4222 }
4223
4224 options->diff_path_counter = 0;
4225
4226 if (options->flags.follow_renames && options->pathspec.nr != 1)
4227 die(_("--follow requires exactly one pathspec"));
4228
4229 if (!options->use_color || external_diff())
4230 options->color_moved = 0;
4231 }
4232
4233 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
4234 {
4235 char c, *eq;
4236 int len;
4237
4238 if (*arg != '-')
4239 return 0;
4240 c = *++arg;
4241 if (!c)
4242 return 0;
4243 if (c == arg_short) {
4244 c = *++arg;
4245 if (!c)
4246 return 1;
4247 if (val && isdigit(c)) {
4248 char *end;
4249 int n = strtoul(arg, &end, 10);
4250 if (*end)
4251 return 0;
4252 *val = n;
4253 return 1;
4254 }
4255 return 0;
4256 }
4257 if (c != '-')
4258 return 0;
4259 arg++;
4260 eq = strchrnul(arg, '=');
4261 len = eq - arg;
4262 if (!len || strncmp(arg, arg_long, len))
4263 return 0;
4264 if (*eq) {
4265 int n;
4266 char *end;
4267 if (!isdigit(*++eq))
4268 return 0;
4269 n = strtoul(eq, &end, 10);
4270 if (*end)
4271 return 0;
4272 *val = n;
4273 }
4274 return 1;
4275 }
4276
4277 static int diff_scoreopt_parse(const char *opt);
4278
4279 static inline int short_opt(char opt, const char **argv,
4280 const char **optarg)
4281 {
4282 const char *arg = argv[0];
4283 if (arg[0] != '-' || arg[1] != opt)
4284 return 0;
4285 if (arg[2] != '\0') {
4286 *optarg = arg + 2;
4287 return 1;
4288 }
4289 if (!argv[1])
4290 die("Option '%c' requires a value", opt);
4291 *optarg = argv[1];
4292 return 2;
4293 }
4294
4295 int parse_long_opt(const char *opt, const char **argv,
4296 const char **optarg)
4297 {
4298 const char *arg = argv[0];
4299 if (!skip_prefix(arg, "--", &arg))
4300 return 0;
4301 if (!skip_prefix(arg, opt, &arg))
4302 return 0;
4303 if (*arg == '=') { /* stuck form: --option=value */
4304 *optarg = arg + 1;
4305 return 1;
4306 }
4307 if (*arg != '\0')
4308 return 0;
4309 /* separate form: --option value */
4310 if (!argv[1])
4311 die("Option '--%s' requires a value", opt);
4312 *optarg = argv[1];
4313 return 2;
4314 }
4315
4316 static int stat_opt(struct diff_options *options, const char **av)
4317 {
4318 const char *arg = av[0];
4319 char *end;
4320 int width = options->stat_width;
4321 int name_width = options->stat_name_width;
4322 int graph_width = options->stat_graph_width;
4323 int count = options->stat_count;
4324 int argcount = 1;
4325
4326 if (!skip_prefix(arg, "--stat", &arg))
4327 die("BUG: stat option does not begin with --stat: %s", arg);
4328 end = (char *)arg;
4329
4330 switch (*arg) {
4331 case '-':
4332 if (skip_prefix(arg, "-width", &arg)) {
4333 if (*arg == '=')
4334 width = strtoul(arg + 1, &end, 10);
4335 else if (!*arg && !av[1])
4336 die_want_option("--stat-width");
4337 else if (!*arg) {
4338 width = strtoul(av[1], &end, 10);
4339 argcount = 2;
4340 }
4341 } else if (skip_prefix(arg, "-name-width", &arg)) {
4342 if (*arg == '=')
4343 name_width = strtoul(arg + 1, &end, 10);
4344 else if (!*arg && !av[1])
4345 die_want_option("--stat-name-width");
4346 else if (!*arg) {
4347 name_width = strtoul(av[1], &end, 10);
4348 argcount = 2;
4349 }
4350 } else if (skip_prefix(arg, "-graph-width", &arg)) {
4351 if (*arg == '=')
4352 graph_width = strtoul(arg + 1, &end, 10);
4353 else if (!*arg && !av[1])
4354 die_want_option("--stat-graph-width");
4355 else if (!*arg) {
4356 graph_width = strtoul(av[1], &end, 10);
4357 argcount = 2;
4358 }
4359 } else if (skip_prefix(arg, "-count", &arg)) {
4360 if (*arg == '=')
4361 count = strtoul(arg + 1, &end, 10);
4362 else if (!*arg && !av[1])
4363 die_want_option("--stat-count");
4364 else if (!*arg) {
4365 count = strtoul(av[1], &end, 10);
4366 argcount = 2;
4367 }
4368 }
4369 break;
4370 case '=':
4371 width = strtoul(arg+1, &end, 10);
4372 if (*end == ',')
4373 name_width = strtoul(end+1, &end, 10);
4374 if (*end == ',')
4375 count = strtoul(end+1, &end, 10);
4376 }
4377
4378 /* Important! This checks all the error cases! */
4379 if (*end)
4380 return 0;
4381 options->output_format |= DIFF_FORMAT_DIFFSTAT;
4382 options->stat_name_width = name_width;
4383 options->stat_graph_width = graph_width;
4384 options->stat_width = width;
4385 options->stat_count = count;
4386 return argcount;
4387 }
4388
4389 static int parse_dirstat_opt(struct diff_options *options, const char *params)
4390 {
4391 struct strbuf errmsg = STRBUF_INIT;
4392 if (parse_dirstat_params(options, params, &errmsg))
4393 die(_("Failed to parse --dirstat/-X option parameter:\n%s"),
4394 errmsg.buf);
4395 strbuf_release(&errmsg);
4396 /*
4397 * The caller knows a dirstat-related option is given from the command
4398 * line; allow it to say "return this_function();"
4399 */
4400 options->output_format |= DIFF_FORMAT_DIRSTAT;
4401 return 1;
4402 }
4403
4404 static int parse_submodule_opt(struct diff_options *options, const char *value)
4405 {
4406 if (parse_submodule_params(options, value))
4407 die(_("Failed to parse --submodule option parameter: '%s'"),
4408 value);
4409 return 1;
4410 }
4411
4412 static const char diff_status_letters[] = {
4413 DIFF_STATUS_ADDED,
4414 DIFF_STATUS_COPIED,
4415 DIFF_STATUS_DELETED,
4416 DIFF_STATUS_MODIFIED,
4417 DIFF_STATUS_RENAMED,
4418 DIFF_STATUS_TYPE_CHANGED,
4419 DIFF_STATUS_UNKNOWN,
4420 DIFF_STATUS_UNMERGED,
4421 DIFF_STATUS_FILTER_AON,
4422 DIFF_STATUS_FILTER_BROKEN,
4423 '\0',
4424 };
4425
4426 static unsigned int filter_bit['Z' + 1];
4427
4428 static void prepare_filter_bits(void)
4429 {
4430 int i;
4431
4432 if (!filter_bit[DIFF_STATUS_ADDED]) {
4433 for (i = 0; diff_status_letters[i]; i++)
4434 filter_bit[(int) diff_status_letters[i]] = (1 << i);
4435 }
4436 }
4437
4438 static unsigned filter_bit_tst(char status, const struct diff_options *opt)
4439 {
4440 return opt->filter & filter_bit[(int) status];
4441 }
4442
4443 static int parse_diff_filter_opt(const char *optarg, struct diff_options *opt)
4444 {
4445 int i, optch;
4446
4447 prepare_filter_bits();
4448
4449 /*
4450 * If there is a negation e.g. 'd' in the input, and we haven't
4451 * initialized the filter field with another --diff-filter, start
4452 * from full set of bits, except for AON.
4453 */
4454 if (!opt->filter) {
4455 for (i = 0; (optch = optarg[i]) != '\0'; i++) {
4456 if (optch < 'a' || 'z' < optch)
4457 continue;
4458 opt->filter = (1 << (ARRAY_SIZE(diff_status_letters) - 1)) - 1;
4459 opt->filter &= ~filter_bit[DIFF_STATUS_FILTER_AON];
4460 break;
4461 }
4462 }
4463
4464 for (i = 0; (optch = optarg[i]) != '\0'; i++) {
4465 unsigned int bit;
4466 int negate;
4467
4468 if ('a' <= optch && optch <= 'z') {
4469 negate = 1;
4470 optch = toupper(optch);
4471 } else {
4472 negate = 0;
4473 }
4474
4475 bit = (0 <= optch && optch <= 'Z') ? filter_bit[optch] : 0;
4476 if (!bit)
4477 return optarg[i];
4478 if (negate)
4479 opt->filter &= ~bit;
4480 else
4481 opt->filter |= bit;
4482 }
4483 return 0;
4484 }
4485
4486 static void enable_patch_output(int *fmt) {
4487 *fmt &= ~DIFF_FORMAT_NO_OUTPUT;
4488 *fmt |= DIFF_FORMAT_PATCH;
4489 }
4490
4491 static int parse_ws_error_highlight_opt(struct diff_options *opt, const char *arg)
4492 {
4493 int val = parse_ws_error_highlight(arg);
4494
4495 if (val < 0) {
4496 error("unknown value after ws-error-highlight=%.*s",
4497 -1 - val, arg);
4498 return 0;
4499 }
4500 opt->ws_error_highlight = val;
4501 return 1;
4502 }
4503
4504 static int parse_objfind_opt(struct diff_options *opt, const char *arg)
4505 {
4506 struct object_id oid;
4507
4508 if (get_oid(arg, &oid))
4509 return error("unable to resolve '%s'", arg);
4510
4511 if (!opt->objfind)
4512 opt->objfind = xcalloc(1, sizeof(*opt->objfind));
4513
4514 opt->pickaxe_opts |= DIFF_PICKAXE_KIND_OBJFIND;
4515 opt->flags.recursive = 1;
4516 opt->flags.tree_in_recursive = 1;
4517 oidset_insert(opt->objfind, &oid);
4518 return 1;
4519 }
4520
4521 int diff_opt_parse(struct diff_options *options,
4522 const char **av, int ac, const char *prefix)
4523 {
4524 const char *arg = av[0];
4525 const char *optarg;
4526 int argcount;
4527
4528 if (!prefix)
4529 prefix = "";
4530
4531 /* Output format options */
4532 if (!strcmp(arg, "-p") || !strcmp(arg, "-u") || !strcmp(arg, "--patch")
4533 || opt_arg(arg, 'U', "unified", &options->context))
4534 enable_patch_output(&options->output_format);
4535 else if (!strcmp(arg, "--raw"))
4536 options->output_format |= DIFF_FORMAT_RAW;
4537 else if (!strcmp(arg, "--patch-with-raw")) {
4538 enable_patch_output(&options->output_format);
4539 options->output_format |= DIFF_FORMAT_RAW;
4540 } else if (!strcmp(arg, "--numstat"))
4541 options->output_format |= DIFF_FORMAT_NUMSTAT;
4542 else if (!strcmp(arg, "--shortstat"))
4543 options->output_format |= DIFF_FORMAT_SHORTSTAT;
4544 else if (skip_prefix(arg, "-X", &arg) ||
4545 skip_to_optional_arg(arg, "--dirstat", &arg))
4546 return parse_dirstat_opt(options, arg);
4547 else if (!strcmp(arg, "--cumulative"))
4548 return parse_dirstat_opt(options, "cumulative");
4549 else if (skip_to_optional_arg(arg, "--dirstat-by-file", &arg)) {
4550 parse_dirstat_opt(options, "files");
4551 return parse_dirstat_opt(options, arg);
4552 }
4553 else if (!strcmp(arg, "--check"))
4554 options->output_format |= DIFF_FORMAT_CHECKDIFF;
4555 else if (!strcmp(arg, "--summary"))
4556 options->output_format |= DIFF_FORMAT_SUMMARY;
4557 else if (!strcmp(arg, "--patch-with-stat")) {
4558 enable_patch_output(&options->output_format);
4559 options->output_format |= DIFF_FORMAT_DIFFSTAT;
4560 } else if (!strcmp(arg, "--name-only"))
4561 options->output_format |= DIFF_FORMAT_NAME;
4562 else if (!strcmp(arg, "--name-status"))
4563 options->output_format |= DIFF_FORMAT_NAME_STATUS;
4564 else if (!strcmp(arg, "-s") || !strcmp(arg, "--no-patch"))
4565 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
4566 else if (starts_with(arg, "--stat"))
4567 /* --stat, --stat-width, --stat-name-width, or --stat-count */
4568 return stat_opt(options, av);
4569 else if (!strcmp(arg, "--compact-summary")) {
4570 options->flags.stat_with_summary = 1;
4571 options->output_format |= DIFF_FORMAT_DIFFSTAT;
4572 } else if (!strcmp(arg, "--no-compact-summary"))
4573 options->flags.stat_with_summary = 0;
4574
4575 /* renames options */
4576 else if (starts_with(arg, "-B") ||
4577 skip_to_optional_arg(arg, "--break-rewrites", NULL)) {
4578 if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
4579 return error("invalid argument to -B: %s", arg+2);
4580 }
4581 else if (starts_with(arg, "-M") ||
4582 skip_to_optional_arg(arg, "--find-renames", NULL)) {
4583 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
4584 return error("invalid argument to -M: %s", arg+2);
4585 options->detect_rename = DIFF_DETECT_RENAME;
4586 }
4587 else if (!strcmp(arg, "-D") || !strcmp(arg, "--irreversible-delete")) {
4588 options->irreversible_delete = 1;
4589 }
4590 else if (starts_with(arg, "-C") ||
4591 skip_to_optional_arg(arg, "--find-copies", NULL)) {
4592 if (options->detect_rename == DIFF_DETECT_COPY)
4593 options->flags.find_copies_harder = 1;
4594 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
4595 return error("invalid argument to -C: %s", arg+2);
4596 options->detect_rename = DIFF_DETECT_COPY;
4597 }
4598 else if (!strcmp(arg, "--no-renames"))
4599 options->detect_rename = 0;
4600 else if (!strcmp(arg, "--rename-empty"))
4601 options->flags.rename_empty = 1;
4602 else if (!strcmp(arg, "--no-rename-empty"))
4603 options->flags.rename_empty = 0;
4604 else if (skip_to_optional_arg_default(arg, "--relative", &arg, NULL)) {
4605 options->flags.relative_name = 1;
4606 if (arg)
4607 options->prefix = arg;
4608 }
4609
4610 /* xdiff options */
4611 else if (!strcmp(arg, "--minimal"))
4612 DIFF_XDL_SET(options, NEED_MINIMAL);
4613 else if (!strcmp(arg, "--no-minimal"))
4614 DIFF_XDL_CLR(options, NEED_MINIMAL);
4615 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
4616 DIFF_XDL_SET(options, IGNORE_WHITESPACE);
4617 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
4618 DIFF_XDL_SET(options, IGNORE_WHITESPACE_CHANGE);
4619 else if (!strcmp(arg, "--ignore-space-at-eol"))
4620 DIFF_XDL_SET(options, IGNORE_WHITESPACE_AT_EOL);
4621 else if (!strcmp(arg, "--ignore-cr-at-eol"))
4622 DIFF_XDL_SET(options, IGNORE_CR_AT_EOL);
4623 else if (!strcmp(arg, "--ignore-blank-lines"))
4624 DIFF_XDL_SET(options, IGNORE_BLANK_LINES);
4625 else if (!strcmp(arg, "--indent-heuristic"))
4626 DIFF_XDL_SET(options, INDENT_HEURISTIC);
4627 else if (!strcmp(arg, "--no-indent-heuristic"))
4628 DIFF_XDL_CLR(options, INDENT_HEURISTIC);
4629 else if (!strcmp(arg, "--patience")) {
4630 int i;
4631 options->xdl_opts = DIFF_WITH_ALG(options, PATIENCE_DIFF);
4632 /*
4633 * Both --patience and --anchored use PATIENCE_DIFF
4634 * internally, so remove any anchors previously
4635 * specified.
4636 */
4637 for (i = 0; i < options->anchors_nr; i++)
4638 free(options->anchors[i]);
4639 options->anchors_nr = 0;
4640 } else if (!strcmp(arg, "--histogram"))
4641 options->xdl_opts = DIFF_WITH_ALG(options, HISTOGRAM_DIFF);
4642 else if ((argcount = parse_long_opt("diff-algorithm", av, &optarg))) {
4643 long value = parse_algorithm_value(optarg);
4644 if (value < 0)
4645 return error("option diff-algorithm accepts \"myers\", "
4646 "\"minimal\", \"patience\" and \"histogram\"");
4647 /* clear out previous settings */
4648 DIFF_XDL_CLR(options, NEED_MINIMAL);
4649 options->xdl_opts &= ~XDF_DIFF_ALGORITHM_MASK;
4650 options->xdl_opts |= value;
4651 return argcount;
4652 } else if (skip_prefix(arg, "--anchored=", &arg)) {
4653 options->xdl_opts = DIFF_WITH_ALG(options, PATIENCE_DIFF);
4654 ALLOC_GROW(options->anchors, options->anchors_nr + 1,
4655 options->anchors_alloc);
4656 options->anchors[options->anchors_nr++] = xstrdup(arg);
4657 }
4658
4659 /* flags options */
4660 else if (!strcmp(arg, "--binary")) {
4661 enable_patch_output(&options->output_format);
4662 options->flags.binary = 1;
4663 }
4664 else if (!strcmp(arg, "--full-index"))
4665 options->flags.full_index = 1;
4666 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
4667 options->flags.text = 1;
4668 else if (!strcmp(arg, "-R"))
4669 options->flags.reverse_diff = 1;
4670 else if (!strcmp(arg, "--find-copies-harder"))
4671 options->flags.find_copies_harder = 1;
4672 else if (!strcmp(arg, "--follow"))
4673 options->flags.follow_renames = 1;
4674 else if (!strcmp(arg, "--no-follow")) {
4675 options->flags.follow_renames = 0;
4676 options->flags.default_follow_renames = 0;
4677 } else if (skip_to_optional_arg_default(arg, "--color", &arg, "always")) {
4678 int value = git_config_colorbool(NULL, arg);
4679 if (value < 0)
4680 return error("option `color' expects \"always\", \"auto\", or \"never\"");
4681 options->use_color = value;
4682 }
4683 else if (!strcmp(arg, "--no-color"))
4684 options->use_color = 0;
4685 else if (!strcmp(arg, "--color-moved")) {
4686 if (diff_color_moved_default)
4687 options->color_moved = diff_color_moved_default;
4688 if (options->color_moved == COLOR_MOVED_NO)
4689 options->color_moved = COLOR_MOVED_DEFAULT;
4690 } else if (!strcmp(arg, "--no-color-moved"))
4691 options->color_moved = COLOR_MOVED_NO;
4692 else if (skip_prefix(arg, "--color-moved=", &arg)) {
4693 int cm = parse_color_moved(arg);
4694 if (cm < 0)
4695 die("bad --color-moved argument: %s", arg);
4696 options->color_moved = cm;
4697 } else if (skip_to_optional_arg_default(arg, "--color-words", &options->word_regex, NULL)) {
4698 options->use_color = 1;
4699 options->word_diff = DIFF_WORDS_COLOR;
4700 }
4701 else if (!strcmp(arg, "--word-diff")) {
4702 if (options->word_diff == DIFF_WORDS_NONE)
4703 options->word_diff = DIFF_WORDS_PLAIN;
4704 }
4705 else if (skip_prefix(arg, "--word-diff=", &arg)) {
4706 if (!strcmp(arg, "plain"))
4707 options->word_diff = DIFF_WORDS_PLAIN;
4708 else if (!strcmp(arg, "color")) {
4709 options->use_color = 1;
4710 options->word_diff = DIFF_WORDS_COLOR;
4711 }
4712 else if (!strcmp(arg, "porcelain"))
4713 options->word_diff = DIFF_WORDS_PORCELAIN;
4714 else if (!strcmp(arg, "none"))
4715 options->word_diff = DIFF_WORDS_NONE;
4716 else
4717 die("bad --word-diff argument: %s", arg);
4718 }
4719 else if ((argcount = parse_long_opt("word-diff-regex", av, &optarg))) {
4720 if (options->word_diff == DIFF_WORDS_NONE)
4721 options->word_diff = DIFF_WORDS_PLAIN;
4722 options->word_regex = optarg;
4723 return argcount;
4724 }
4725 else if (!strcmp(arg, "--exit-code"))
4726 options->flags.exit_with_status = 1;
4727 else if (!strcmp(arg, "--quiet"))
4728 options->flags.quick = 1;
4729 else if (!strcmp(arg, "--ext-diff"))
4730 options->flags.allow_external = 1;
4731 else if (!strcmp(arg, "--no-ext-diff"))
4732 options->flags.allow_external = 0;
4733 else if (!strcmp(arg, "--textconv")) {
4734 options->flags.allow_textconv = 1;
4735 options->flags.textconv_set_via_cmdline = 1;
4736 } else if (!strcmp(arg, "--no-textconv"))
4737 options->flags.allow_textconv = 0;
4738 else if (skip_to_optional_arg_default(arg, "--ignore-submodules", &arg, "all")) {
4739 options->flags.override_submodule_config = 1;
4740 handle_ignore_submodules_arg(options, arg);
4741 } else if (skip_to_optional_arg_default(arg, "--submodule", &arg, "log"))
4742 return parse_submodule_opt(options, arg);
4743 else if (skip_prefix(arg, "--ws-error-highlight=", &arg))
4744 return parse_ws_error_highlight_opt(options, arg);
4745 else if (!strcmp(arg, "--ita-invisible-in-index"))
4746 options->ita_invisible_in_index = 1;
4747 else if (!strcmp(arg, "--ita-visible-in-index"))
4748 options->ita_invisible_in_index = 0;
4749
4750 /* misc options */
4751 else if (!strcmp(arg, "-z"))
4752 options->line_termination = 0;
4753 else if ((argcount = short_opt('l', av, &optarg))) {
4754 options->rename_limit = strtoul(optarg, NULL, 10);
4755 return argcount;
4756 }
4757 else if ((argcount = short_opt('S', av, &optarg))) {
4758 options->pickaxe = optarg;
4759 options->pickaxe_opts |= DIFF_PICKAXE_KIND_S;
4760 return argcount;
4761 } else if ((argcount = short_opt('G', av, &optarg))) {
4762 options->pickaxe = optarg;
4763 options->pickaxe_opts |= DIFF_PICKAXE_KIND_G;
4764 return argcount;
4765 }
4766 else if (!strcmp(arg, "--pickaxe-all"))
4767 options->pickaxe_opts |= DIFF_PICKAXE_ALL;
4768 else if (!strcmp(arg, "--pickaxe-regex"))
4769 options->pickaxe_opts |= DIFF_PICKAXE_REGEX;
4770 else if ((argcount = short_opt('O', av, &optarg))) {
4771 options->orderfile = prefix_filename(prefix, optarg);
4772 return argcount;
4773 } else if (skip_prefix(arg, "--find-object=", &arg))
4774 return parse_objfind_opt(options, arg);
4775 else if ((argcount = parse_long_opt("diff-filter", av, &optarg))) {
4776 int offending = parse_diff_filter_opt(optarg, options);
4777 if (offending)
4778 die("unknown change class '%c' in --diff-filter=%s",
4779 offending, optarg);
4780 return argcount;
4781 }
4782 else if (!strcmp(arg, "--no-abbrev"))
4783 options->abbrev = 0;
4784 else if (!strcmp(arg, "--abbrev"))
4785 options->abbrev = DEFAULT_ABBREV;
4786 else if (skip_prefix(arg, "--abbrev=", &arg)) {
4787 options->abbrev = strtoul(arg, NULL, 10);
4788 if (options->abbrev < MINIMUM_ABBREV)
4789 options->abbrev = MINIMUM_ABBREV;
4790 else if (40 < options->abbrev)
4791 options->abbrev = 40;
4792 }
4793 else if ((argcount = parse_long_opt("src-prefix", av, &optarg))) {
4794 options->a_prefix = optarg;
4795 return argcount;
4796 }
4797 else if ((argcount = parse_long_opt("line-prefix", av, &optarg))) {
4798 options->line_prefix = optarg;
4799 options->line_prefix_length = strlen(options->line_prefix);
4800 graph_setup_line_prefix(options);
4801 return argcount;
4802 }
4803 else if ((argcount = parse_long_opt("dst-prefix", av, &optarg))) {
4804 options->b_prefix = optarg;
4805 return argcount;
4806 }
4807 else if (!strcmp(arg, "--no-prefix"))
4808 options->a_prefix = options->b_prefix = "";
4809 else if (opt_arg(arg, '\0', "inter-hunk-context",
4810 &options->interhunkcontext))
4811 ;
4812 else if (!strcmp(arg, "-W"))
4813 options->flags.funccontext = 1;
4814 else if (!strcmp(arg, "--function-context"))
4815 options->flags.funccontext = 1;
4816 else if (!strcmp(arg, "--no-function-context"))
4817 options->flags.funccontext = 0;
4818 else if ((argcount = parse_long_opt("output", av, &optarg))) {
4819 char *path = prefix_filename(prefix, optarg);
4820 options->file = xfopen(path, "w");
4821 options->close_file = 1;
4822 if (options->use_color != GIT_COLOR_ALWAYS)
4823 options->use_color = GIT_COLOR_NEVER;
4824 free(path);
4825 return argcount;
4826 } else
4827 return 0;
4828 return 1;
4829 }
4830
4831 int parse_rename_score(const char **cp_p)
4832 {
4833 unsigned long num, scale;
4834 int ch, dot;
4835 const char *cp = *cp_p;
4836
4837 num = 0;
4838 scale = 1;
4839 dot = 0;
4840 for (;;) {
4841 ch = *cp;
4842 if ( !dot && ch == '.' ) {
4843 scale = 1;
4844 dot = 1;
4845 } else if ( ch == '%' ) {
4846 scale = dot ? scale*100 : 100;
4847 cp++; /* % is always at the end */
4848 break;
4849 } else if ( ch >= '0' && ch <= '9' ) {
4850 if ( scale < 100000 ) {
4851 scale *= 10;
4852 num = (num*10) + (ch-'0');
4853 }
4854 } else {
4855 break;
4856 }
4857 cp++;
4858 }
4859 *cp_p = cp;
4860
4861 /* user says num divided by scale and we say internally that
4862 * is MAX_SCORE * num / scale.
4863 */
4864 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
4865 }
4866
4867 static int diff_scoreopt_parse(const char *opt)
4868 {
4869 int opt1, opt2, cmd;
4870
4871 if (*opt++ != '-')
4872 return -1;
4873 cmd = *opt++;
4874 if (cmd == '-') {
4875 /* convert the long-form arguments into short-form versions */
4876 if (skip_prefix(opt, "break-rewrites", &opt)) {
4877 if (*opt == 0 || *opt++ == '=')
4878 cmd = 'B';
4879 } else if (skip_prefix(opt, "find-copies", &opt)) {
4880 if (*opt == 0 || *opt++ == '=')
4881 cmd = 'C';
4882 } else if (skip_prefix(opt, "find-renames", &opt)) {
4883 if (*opt == 0 || *opt++ == '=')
4884 cmd = 'M';
4885 }
4886 }
4887 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
4888 return -1; /* that is not a -M, -C, or -B option */
4889
4890 opt1 = parse_rename_score(&opt);
4891 if (cmd != 'B')
4892 opt2 = 0;
4893 else {
4894 if (*opt == 0)
4895 opt2 = 0;
4896 else if (*opt != '/')
4897 return -1; /* we expect -B80/99 or -B80 */
4898 else {
4899 opt++;
4900 opt2 = parse_rename_score(&opt);
4901 }
4902 }
4903 if (*opt != 0)
4904 return -1;
4905 return opt1 | (opt2 << 16);
4906 }
4907
4908 struct diff_queue_struct diff_queued_diff;
4909
4910 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
4911 {
4912 ALLOC_GROW(queue->queue, queue->nr + 1, queue->alloc);
4913 queue->queue[queue->nr++] = dp;
4914 }
4915
4916 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
4917 struct diff_filespec *one,
4918 struct diff_filespec *two)
4919 {
4920 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
4921 dp->one = one;
4922 dp->two = two;
4923 if (queue)
4924 diff_q(queue, dp);
4925 return dp;
4926 }
4927
4928 void diff_free_filepair(struct diff_filepair *p)
4929 {
4930 free_filespec(p->one);
4931 free_filespec(p->two);
4932 free(p);
4933 }
4934
4935 const char *diff_aligned_abbrev(const struct object_id *oid, int len)
4936 {
4937 int abblen;
4938 const char *abbrev;
4939
4940 /* Do we want all 40 hex characters? */
4941 if (len == GIT_SHA1_HEXSZ)
4942 return oid_to_hex(oid);
4943
4944 /* An abbreviated value is fine, possibly followed by an ellipsis. */
4945 abbrev = diff_abbrev_oid(oid, len);
4946
4947 if (!print_sha1_ellipsis())
4948 return abbrev;
4949
4950 abblen = strlen(abbrev);
4951
4952 /*
4953 * In well-behaved cases, where the abbreviated result is the
4954 * same as the requested length, append three dots after the
4955 * abbreviation (hence the whole logic is limited to the case
4956 * where abblen < 37); when the actual abbreviated result is a
4957 * bit longer than the requested length, we reduce the number
4958 * of dots so that they match the well-behaved ones. However,
4959 * if the actual abbreviation is longer than the requested
4960 * length by more than three, we give up on aligning, and add
4961 * three dots anyway, to indicate that the output is not the
4962 * full object name. Yes, this may be suboptimal, but this
4963 * appears only in "diff --raw --abbrev" output and it is not
4964 * worth the effort to change it now. Note that this would
4965 * likely to work fine when the automatic sizing of default
4966 * abbreviation length is used--we would be fed -1 in "len" in
4967 * that case, and will end up always appending three-dots, but
4968 * the automatic sizing is supposed to give abblen that ensures
4969 * uniqueness across all objects (statistically speaking).
4970 */
4971 if (abblen < GIT_SHA1_HEXSZ - 3) {
4972 static char hex[GIT_MAX_HEXSZ + 1];
4973 if (len < abblen && abblen <= len + 2)
4974 xsnprintf(hex, sizeof(hex), "%s%.*s", abbrev, len+3-abblen, "..");
4975 else
4976 xsnprintf(hex, sizeof(hex), "%s...", abbrev);
4977 return hex;
4978 }
4979
4980 return oid_to_hex(oid);
4981 }
4982
4983 static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
4984 {
4985 int line_termination = opt->line_termination;
4986 int inter_name_termination = line_termination ? '\t' : '\0';
4987
4988 fprintf(opt->file, "%s", diff_line_prefix(opt));
4989 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
4990 fprintf(opt->file, ":%06o %06o %s ", p->one->mode, p->two->mode,
4991 diff_aligned_abbrev(&p->one->oid, opt->abbrev));
4992 fprintf(opt->file, "%s ",
4993 diff_aligned_abbrev(&p->two->oid, opt->abbrev));
4994 }
4995 if (p->score) {
4996 fprintf(opt->file, "%c%03d%c", p->status, similarity_index(p),
4997 inter_name_termination);
4998 } else {
4999 fprintf(opt->file, "%c%c", p->status, inter_name_termination);
5000 }
5001
5002 if (p->status == DIFF_STATUS_COPIED ||
5003 p->status == DIFF_STATUS_RENAMED) {
5004 const char *name_a, *name_b;
5005 name_a = p->one->path;
5006 name_b = p->two->path;
5007 strip_prefix(opt->prefix_length, &name_a, &name_b);
5008 write_name_quoted(name_a, opt->file, inter_name_termination);
5009 write_name_quoted(name_b, opt->file, line_termination);
5010 } else {
5011 const char *name_a, *name_b;
5012 name_a = p->one->mode ? p->one->path : p->two->path;
5013 name_b = NULL;
5014 strip_prefix(opt->prefix_length, &name_a, &name_b);
5015 write_name_quoted(name_a, opt->file, line_termination);
5016 }
5017 }
5018
5019 int diff_unmodified_pair(struct diff_filepair *p)
5020 {
5021 /* This function is written stricter than necessary to support
5022 * the currently implemented transformers, but the idea is to
5023 * let transformers to produce diff_filepairs any way they want,
5024 * and filter and clean them up here before producing the output.
5025 */
5026 struct diff_filespec *one = p->one, *two = p->two;
5027
5028 if (DIFF_PAIR_UNMERGED(p))
5029 return 0; /* unmerged is interesting */
5030
5031 /* deletion, addition, mode or type change
5032 * and rename are all interesting.
5033 */
5034 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
5035 DIFF_PAIR_MODE_CHANGED(p) ||
5036 strcmp(one->path, two->path))
5037 return 0;
5038
5039 /* both are valid and point at the same path. that is, we are
5040 * dealing with a change.
5041 */
5042 if (one->oid_valid && two->oid_valid &&
5043 !oidcmp(&one->oid, &two->oid) &&
5044 !one->dirty_submodule && !two->dirty_submodule)
5045 return 1; /* no change */
5046 if (!one->oid_valid && !two->oid_valid)
5047 return 1; /* both look at the same file on the filesystem. */
5048 return 0;
5049 }
5050
5051 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
5052 {
5053 if (diff_unmodified_pair(p))
5054 return;
5055
5056 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
5057 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
5058 return; /* no tree diffs in patch format */
5059
5060 run_diff(p, o);
5061 }
5062
5063 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
5064 struct diffstat_t *diffstat)
5065 {
5066 if (diff_unmodified_pair(p))
5067 return;
5068
5069 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
5070 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
5071 return; /* no useful stat for tree diffs */
5072
5073 run_diffstat(p, o, diffstat);
5074 }
5075
5076 static void diff_flush_checkdiff(struct diff_filepair *p,
5077 struct diff_options *o)
5078 {
5079 if (diff_unmodified_pair(p))
5080 return;
5081
5082 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
5083 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
5084 return; /* nothing to check in tree diffs */
5085
5086 run_checkdiff(p, o);
5087 }
5088
5089 int diff_queue_is_empty(void)
5090 {
5091 struct diff_queue_struct *q = &diff_queued_diff;
5092 int i;
5093 for (i = 0; i < q->nr; i++)
5094 if (!diff_unmodified_pair(q->queue[i]))
5095 return 0;
5096 return 1;
5097 }
5098
5099 #if DIFF_DEBUG
5100 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
5101 {
5102 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
5103 x, one ? one : "",
5104 s->path,
5105 DIFF_FILE_VALID(s) ? "valid" : "invalid",
5106 s->mode,
5107 s->oid_valid ? oid_to_hex(&s->oid) : "");
5108 fprintf(stderr, "queue[%d] %s size %lu\n",
5109 x, one ? one : "",
5110 s->size);
5111 }
5112
5113 void diff_debug_filepair(const struct diff_filepair *p, int i)
5114 {
5115 diff_debug_filespec(p->one, i, "one");
5116 diff_debug_filespec(p->two, i, "two");
5117 fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
5118 p->score, p->status ? p->status : '?',
5119 p->one->rename_used, p->broken_pair);
5120 }
5121
5122 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
5123 {
5124 int i;
5125 if (msg)
5126 fprintf(stderr, "%s\n", msg);
5127 fprintf(stderr, "q->nr = %d\n", q->nr);
5128 for (i = 0; i < q->nr; i++) {
5129 struct diff_filepair *p = q->queue[i];
5130 diff_debug_filepair(p, i);
5131 }
5132 }
5133 #endif
5134
5135 static void diff_resolve_rename_copy(void)
5136 {
5137 int i;
5138 struct diff_filepair *p;
5139 struct diff_queue_struct *q = &diff_queued_diff;
5140
5141 diff_debug_queue("resolve-rename-copy", q);
5142
5143 for (i = 0; i < q->nr; i++) {
5144 p = q->queue[i];
5145 p->status = 0; /* undecided */
5146 if (DIFF_PAIR_UNMERGED(p))
5147 p->status = DIFF_STATUS_UNMERGED;
5148 else if (!DIFF_FILE_VALID(p->one))
5149 p->status = DIFF_STATUS_ADDED;
5150 else if (!DIFF_FILE_VALID(p->two))
5151 p->status = DIFF_STATUS_DELETED;
5152 else if (DIFF_PAIR_TYPE_CHANGED(p))
5153 p->status = DIFF_STATUS_TYPE_CHANGED;
5154
5155 /* from this point on, we are dealing with a pair
5156 * whose both sides are valid and of the same type, i.e.
5157 * either in-place edit or rename/copy edit.
5158 */
5159 else if (DIFF_PAIR_RENAME(p)) {
5160 /*
5161 * A rename might have re-connected a broken
5162 * pair up, causing the pathnames to be the
5163 * same again. If so, that's not a rename at
5164 * all, just a modification..
5165 *
5166 * Otherwise, see if this source was used for
5167 * multiple renames, in which case we decrement
5168 * the count, and call it a copy.
5169 */
5170 if (!strcmp(p->one->path, p->two->path))
5171 p->status = DIFF_STATUS_MODIFIED;
5172 else if (--p->one->rename_used > 0)
5173 p->status = DIFF_STATUS_COPIED;
5174 else
5175 p->status = DIFF_STATUS_RENAMED;
5176 }
5177 else if (oidcmp(&p->one->oid, &p->two->oid) ||
5178 p->one->mode != p->two->mode ||
5179 p->one->dirty_submodule ||
5180 p->two->dirty_submodule ||
5181 is_null_oid(&p->one->oid))
5182 p->status = DIFF_STATUS_MODIFIED;
5183 else {
5184 /* This is a "no-change" entry and should not
5185 * happen anymore, but prepare for broken callers.
5186 */
5187 error("feeding unmodified %s to diffcore",
5188 p->one->path);
5189 p->status = DIFF_STATUS_UNKNOWN;
5190 }
5191 }
5192 diff_debug_queue("resolve-rename-copy done", q);
5193 }
5194
5195 static int check_pair_status(struct diff_filepair *p)
5196 {
5197 switch (p->status) {
5198 case DIFF_STATUS_UNKNOWN:
5199 return 0;
5200 case 0:
5201 die("internal error in diff-resolve-rename-copy");
5202 default:
5203 return 1;
5204 }
5205 }
5206
5207 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
5208 {
5209 int fmt = opt->output_format;
5210
5211 if (fmt & DIFF_FORMAT_CHECKDIFF)
5212 diff_flush_checkdiff(p, opt);
5213 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
5214 diff_flush_raw(p, opt);
5215 else if (fmt & DIFF_FORMAT_NAME) {
5216 const char *name_a, *name_b;
5217 name_a = p->two->path;
5218 name_b = NULL;
5219 strip_prefix(opt->prefix_length, &name_a, &name_b);
5220 fprintf(opt->file, "%s", diff_line_prefix(opt));
5221 write_name_quoted(name_a, opt->file, opt->line_termination);
5222 }
5223 }
5224
5225 static void show_file_mode_name(struct diff_options *opt, const char *newdelete, struct diff_filespec *fs)
5226 {
5227 struct strbuf sb = STRBUF_INIT;
5228 if (fs->mode)
5229 strbuf_addf(&sb, " %s mode %06o ", newdelete, fs->mode);
5230 else
5231 strbuf_addf(&sb, " %s ", newdelete);
5232
5233 quote_c_style(fs->path, &sb, NULL, 0);
5234 strbuf_addch(&sb, '\n');
5235 emit_diff_symbol(opt, DIFF_SYMBOL_SUMMARY,
5236 sb.buf, sb.len, 0);
5237 strbuf_release(&sb);
5238 }
5239
5240 static void show_mode_change(struct diff_options *opt, struct diff_filepair *p,
5241 int show_name)
5242 {
5243 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
5244 struct strbuf sb = STRBUF_INIT;
5245 strbuf_addf(&sb, " mode change %06o => %06o",
5246 p->one->mode, p->two->mode);
5247 if (show_name) {
5248 strbuf_addch(&sb, ' ');
5249 quote_c_style(p->two->path, &sb, NULL, 0);
5250 }
5251 strbuf_addch(&sb, '\n');
5252 emit_diff_symbol(opt, DIFF_SYMBOL_SUMMARY,
5253 sb.buf, sb.len, 0);
5254 strbuf_release(&sb);
5255 }
5256 }
5257
5258 static void show_rename_copy(struct diff_options *opt, const char *renamecopy,
5259 struct diff_filepair *p)
5260 {
5261 struct strbuf sb = STRBUF_INIT;
5262 struct strbuf names = STRBUF_INIT;
5263
5264 pprint_rename(&names, p->one->path, p->two->path);
5265 strbuf_addf(&sb, " %s %s (%d%%)\n",
5266 renamecopy, names.buf, similarity_index(p));
5267 strbuf_release(&names);
5268 emit_diff_symbol(opt, DIFF_SYMBOL_SUMMARY,
5269 sb.buf, sb.len, 0);
5270 show_mode_change(opt, p, 0);
5271 strbuf_release(&sb);
5272 }
5273
5274 static void diff_summary(struct diff_options *opt, struct diff_filepair *p)
5275 {
5276 switch(p->status) {
5277 case DIFF_STATUS_DELETED:
5278 show_file_mode_name(opt, "delete", p->one);
5279 break;
5280 case DIFF_STATUS_ADDED:
5281 show_file_mode_name(opt, "create", p->two);
5282 break;
5283 case DIFF_STATUS_COPIED:
5284 show_rename_copy(opt, "copy", p);
5285 break;
5286 case DIFF_STATUS_RENAMED:
5287 show_rename_copy(opt, "rename", p);
5288 break;
5289 default:
5290 if (p->score) {
5291 struct strbuf sb = STRBUF_INIT;
5292 strbuf_addstr(&sb, " rewrite ");
5293 quote_c_style(p->two->path, &sb, NULL, 0);
5294 strbuf_addf(&sb, " (%d%%)\n", similarity_index(p));
5295 emit_diff_symbol(opt, DIFF_SYMBOL_SUMMARY,
5296 sb.buf, sb.len, 0);
5297 strbuf_release(&sb);
5298 }
5299 show_mode_change(opt, p, !p->score);
5300 break;
5301 }
5302 }
5303
5304 struct patch_id_t {
5305 git_SHA_CTX *ctx;
5306 int patchlen;
5307 };
5308
5309 static int remove_space(char *line, int len)
5310 {
5311 int i;
5312 char *dst = line;
5313 unsigned char c;
5314
5315 for (i = 0; i < len; i++)
5316 if (!isspace((c = line[i])))
5317 *dst++ = c;
5318
5319 return dst - line;
5320 }
5321
5322 static void patch_id_consume(void *priv, char *line, unsigned long len)
5323 {
5324 struct patch_id_t *data = priv;
5325 int new_len;
5326
5327 /* Ignore line numbers when computing the SHA1 of the patch */
5328 if (starts_with(line, "@@ -"))
5329 return;
5330
5331 new_len = remove_space(line, len);
5332
5333 git_SHA1_Update(data->ctx, line, new_len);
5334 data->patchlen += new_len;
5335 }
5336
5337 static void patch_id_add_string(git_SHA_CTX *ctx, const char *str)
5338 {
5339 git_SHA1_Update(ctx, str, strlen(str));
5340 }
5341
5342 static void patch_id_add_mode(git_SHA_CTX *ctx, unsigned mode)
5343 {
5344 /* large enough for 2^32 in octal */
5345 char buf[12];
5346 int len = xsnprintf(buf, sizeof(buf), "%06o", mode);
5347 git_SHA1_Update(ctx, buf, len);
5348 }
5349
5350 /* returns 0 upon success, and writes result into sha1 */
5351 static int diff_get_patch_id(struct diff_options *options, struct object_id *oid, int diff_header_only)
5352 {
5353 struct diff_queue_struct *q = &diff_queued_diff;
5354 int i;
5355 git_SHA_CTX ctx;
5356 struct patch_id_t data;
5357
5358 git_SHA1_Init(&ctx);
5359 memset(&data, 0, sizeof(struct patch_id_t));
5360 data.ctx = &ctx;
5361
5362 for (i = 0; i < q->nr; i++) {
5363 xpparam_t xpp;
5364 xdemitconf_t xecfg;
5365 mmfile_t mf1, mf2;
5366 struct diff_filepair *p = q->queue[i];
5367 int len1, len2;
5368
5369 memset(&xpp, 0, sizeof(xpp));
5370 memset(&xecfg, 0, sizeof(xecfg));
5371 if (p->status == 0)
5372 return error("internal diff status error");
5373 if (p->status == DIFF_STATUS_UNKNOWN)
5374 continue;
5375 if (diff_unmodified_pair(p))
5376 continue;
5377 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
5378 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
5379 continue;
5380 if (DIFF_PAIR_UNMERGED(p))
5381 continue;
5382
5383 diff_fill_oid_info(p->one);
5384 diff_fill_oid_info(p->two);
5385
5386 len1 = remove_space(p->one->path, strlen(p->one->path));
5387 len2 = remove_space(p->two->path, strlen(p->two->path));
5388 patch_id_add_string(&ctx, "diff--git");
5389 patch_id_add_string(&ctx, "a/");
5390 git_SHA1_Update(&ctx, p->one->path, len1);
5391 patch_id_add_string(&ctx, "b/");
5392 git_SHA1_Update(&ctx, p->two->path, len2);
5393
5394 if (p->one->mode == 0) {
5395 patch_id_add_string(&ctx, "newfilemode");
5396 patch_id_add_mode(&ctx, p->two->mode);
5397 patch_id_add_string(&ctx, "---/dev/null");
5398 patch_id_add_string(&ctx, "+++b/");
5399 git_SHA1_Update(&ctx, p->two->path, len2);
5400 } else if (p->two->mode == 0) {
5401 patch_id_add_string(&ctx, "deletedfilemode");
5402 patch_id_add_mode(&ctx, p->one->mode);
5403 patch_id_add_string(&ctx, "---a/");
5404 git_SHA1_Update(&ctx, p->one->path, len1);
5405 patch_id_add_string(&ctx, "+++/dev/null");
5406 } else {
5407 patch_id_add_string(&ctx, "---a/");
5408 git_SHA1_Update(&ctx, p->one->path, len1);
5409 patch_id_add_string(&ctx, "+++b/");
5410 git_SHA1_Update(&ctx, p->two->path, len2);
5411 }
5412
5413 if (diff_header_only)
5414 continue;
5415
5416 if (fill_mmfile(&mf1, p->one) < 0 ||
5417 fill_mmfile(&mf2, p->two) < 0)
5418 return error("unable to read files to diff");
5419
5420 if (diff_filespec_is_binary(p->one) ||
5421 diff_filespec_is_binary(p->two)) {
5422 git_SHA1_Update(&ctx, oid_to_hex(&p->one->oid),
5423 GIT_SHA1_HEXSZ);
5424 git_SHA1_Update(&ctx, oid_to_hex(&p->two->oid),
5425 GIT_SHA1_HEXSZ);
5426 continue;
5427 }
5428
5429 xpp.flags = 0;
5430 xecfg.ctxlen = 3;
5431 xecfg.flags = 0;
5432 if (xdi_diff_outf(&mf1, &mf2, patch_id_consume, &data,
5433 &xpp, &xecfg))
5434 return error("unable to generate patch-id diff for %s",
5435 p->one->path);
5436 }
5437
5438 git_SHA1_Final(oid->hash, &ctx);
5439 return 0;
5440 }
5441
5442 int diff_flush_patch_id(struct diff_options *options, struct object_id *oid, int diff_header_only)
5443 {
5444 struct diff_queue_struct *q = &diff_queued_diff;
5445 int i;
5446 int result = diff_get_patch_id(options, oid, diff_header_only);
5447
5448 for (i = 0; i < q->nr; i++)
5449 diff_free_filepair(q->queue[i]);
5450
5451 free(q->queue);
5452 DIFF_QUEUE_CLEAR(q);
5453
5454 return result;
5455 }
5456
5457 static int is_summary_empty(const struct diff_queue_struct *q)
5458 {
5459 int i;
5460
5461 for (i = 0; i < q->nr; i++) {
5462 const struct diff_filepair *p = q->queue[i];
5463
5464 switch (p->status) {
5465 case DIFF_STATUS_DELETED:
5466 case DIFF_STATUS_ADDED:
5467 case DIFF_STATUS_COPIED:
5468 case DIFF_STATUS_RENAMED:
5469 return 0;
5470 default:
5471 if (p->score)
5472 return 0;
5473 if (p->one->mode && p->two->mode &&
5474 p->one->mode != p->two->mode)
5475 return 0;
5476 break;
5477 }
5478 }
5479 return 1;
5480 }
5481
5482 static const char rename_limit_warning[] =
5483 N_("inexact rename detection was skipped due to too many files.");
5484
5485 static const char degrade_cc_to_c_warning[] =
5486 N_("only found copies from modified paths due to too many files.");
5487
5488 static const char rename_limit_advice[] =
5489 N_("you may want to set your %s variable to at least "
5490 "%d and retry the command.");
5491
5492 void diff_warn_rename_limit(const char *varname, int needed, int degraded_cc)
5493 {
5494 fflush(stdout);
5495 if (degraded_cc)
5496 warning(_(degrade_cc_to_c_warning));
5497 else if (needed)
5498 warning(_(rename_limit_warning));
5499 else
5500 return;
5501 if (0 < needed)
5502 warning(_(rename_limit_advice), varname, needed);
5503 }
5504
5505 static void diff_flush_patch_all_file_pairs(struct diff_options *o)
5506 {
5507 int i;
5508 static struct emitted_diff_symbols esm = EMITTED_DIFF_SYMBOLS_INIT;
5509 struct diff_queue_struct *q = &diff_queued_diff;
5510
5511 if (WSEH_NEW & WS_RULE_MASK)
5512 die("BUG: WS rules bit mask overlaps with diff symbol flags");
5513
5514 if (o->color_moved)
5515 o->emitted_symbols = &esm;
5516
5517 for (i = 0; i < q->nr; i++) {
5518 struct diff_filepair *p = q->queue[i];
5519 if (check_pair_status(p))
5520 diff_flush_patch(p, o);
5521 }
5522
5523 if (o->emitted_symbols) {
5524 if (o->color_moved) {
5525 struct hashmap add_lines, del_lines;
5526
5527 hashmap_init(&del_lines,
5528 (hashmap_cmp_fn)moved_entry_cmp, o, 0);
5529 hashmap_init(&add_lines,
5530 (hashmap_cmp_fn)moved_entry_cmp, o, 0);
5531
5532 add_lines_to_move_detection(o, &add_lines, &del_lines);
5533 mark_color_as_moved(o, &add_lines, &del_lines);
5534 if (o->color_moved == COLOR_MOVED_ZEBRA_DIM)
5535 dim_moved_lines(o);
5536
5537 hashmap_free(&add_lines, 0);
5538 hashmap_free(&del_lines, 0);
5539 }
5540
5541 for (i = 0; i < esm.nr; i++)
5542 emit_diff_symbol_from_struct(o, &esm.buf[i]);
5543
5544 for (i = 0; i < esm.nr; i++)
5545 free((void *)esm.buf[i].line);
5546 }
5547 esm.nr = 0;
5548 }
5549
5550 void diff_flush(struct diff_options *options)
5551 {
5552 struct diff_queue_struct *q = &diff_queued_diff;
5553 int i, output_format = options->output_format;
5554 int separator = 0;
5555 int dirstat_by_line = 0;
5556
5557 /*
5558 * Order: raw, stat, summary, patch
5559 * or: name/name-status/checkdiff (other bits clear)
5560 */
5561 if (!q->nr)
5562 goto free_queue;
5563
5564 if (output_format & (DIFF_FORMAT_RAW |
5565 DIFF_FORMAT_NAME |
5566 DIFF_FORMAT_NAME_STATUS |
5567 DIFF_FORMAT_CHECKDIFF)) {
5568 for (i = 0; i < q->nr; i++) {
5569 struct diff_filepair *p = q->queue[i];
5570 if (check_pair_status(p))
5571 flush_one_pair(p, options);
5572 }
5573 separator++;
5574 }
5575
5576 if (output_format & DIFF_FORMAT_DIRSTAT && options->flags.dirstat_by_line)
5577 dirstat_by_line = 1;
5578
5579 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT) ||
5580 dirstat_by_line) {
5581 struct diffstat_t diffstat;
5582
5583 memset(&diffstat, 0, sizeof(struct diffstat_t));
5584 for (i = 0; i < q->nr; i++) {
5585 struct diff_filepair *p = q->queue[i];
5586 if (check_pair_status(p))
5587 diff_flush_stat(p, options, &diffstat);
5588 }
5589 if (output_format & DIFF_FORMAT_NUMSTAT)
5590 show_numstat(&diffstat, options);
5591 if (output_format & DIFF_FORMAT_DIFFSTAT)
5592 show_stats(&diffstat, options);
5593 if (output_format & DIFF_FORMAT_SHORTSTAT)
5594 show_shortstats(&diffstat, options);
5595 if (output_format & DIFF_FORMAT_DIRSTAT && dirstat_by_line)
5596 show_dirstat_by_line(&diffstat, options);
5597 free_diffstat_info(&diffstat);
5598 separator++;
5599 }
5600 if ((output_format & DIFF_FORMAT_DIRSTAT) && !dirstat_by_line)
5601 show_dirstat(options);
5602
5603 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
5604 for (i = 0; i < q->nr; i++) {
5605 diff_summary(options, q->queue[i]);
5606 }
5607 separator++;
5608 }
5609
5610 if (output_format & DIFF_FORMAT_NO_OUTPUT &&
5611 options->flags.exit_with_status &&
5612 options->flags.diff_from_contents) {
5613 /*
5614 * run diff_flush_patch for the exit status. setting
5615 * options->file to /dev/null should be safe, because we
5616 * aren't supposed to produce any output anyway.
5617 */
5618 if (options->close_file)
5619 fclose(options->file);
5620 options->file = xfopen("/dev/null", "w");
5621 options->close_file = 1;
5622 options->color_moved = 0;
5623 for (i = 0; i < q->nr; i++) {
5624 struct diff_filepair *p = q->queue[i];
5625 if (check_pair_status(p))
5626 diff_flush_patch(p, options);
5627 if (options->found_changes)
5628 break;
5629 }
5630 }
5631
5632 if (output_format & DIFF_FORMAT_PATCH) {
5633 if (separator) {
5634 emit_diff_symbol(options, DIFF_SYMBOL_SEPARATOR, NULL, 0, 0);
5635 if (options->stat_sep)
5636 /* attach patch instead of inline */
5637 emit_diff_symbol(options, DIFF_SYMBOL_STAT_SEP,
5638 NULL, 0, 0);
5639 }
5640
5641 diff_flush_patch_all_file_pairs(options);
5642 }
5643
5644 if (output_format & DIFF_FORMAT_CALLBACK)
5645 options->format_callback(q, options, options->format_callback_data);
5646
5647 for (i = 0; i < q->nr; i++)
5648 diff_free_filepair(q->queue[i]);
5649 free_queue:
5650 free(q->queue);
5651 DIFF_QUEUE_CLEAR(q);
5652 if (options->close_file)
5653 fclose(options->file);
5654
5655 /*
5656 * Report the content-level differences with HAS_CHANGES;
5657 * diff_addremove/diff_change does not set the bit when
5658 * DIFF_FROM_CONTENTS is in effect (e.g. with -w).
5659 */
5660 if (options->flags.diff_from_contents) {
5661 if (options->found_changes)
5662 options->flags.has_changes = 1;
5663 else
5664 options->flags.has_changes = 0;
5665 }
5666 }
5667
5668 static int match_filter(const struct diff_options *options, const struct diff_filepair *p)
5669 {
5670 return (((p->status == DIFF_STATUS_MODIFIED) &&
5671 ((p->score &&
5672 filter_bit_tst(DIFF_STATUS_FILTER_BROKEN, options)) ||
5673 (!p->score &&
5674 filter_bit_tst(DIFF_STATUS_MODIFIED, options)))) ||
5675 ((p->status != DIFF_STATUS_MODIFIED) &&
5676 filter_bit_tst(p->status, options)));
5677 }
5678
5679 static void diffcore_apply_filter(struct diff_options *options)
5680 {
5681 int i;
5682 struct diff_queue_struct *q = &diff_queued_diff;
5683 struct diff_queue_struct outq;
5684
5685 DIFF_QUEUE_CLEAR(&outq);
5686
5687 if (!options->filter)
5688 return;
5689
5690 if (filter_bit_tst(DIFF_STATUS_FILTER_AON, options)) {
5691 int found;
5692 for (i = found = 0; !found && i < q->nr; i++) {
5693 if (match_filter(options, q->queue[i]))
5694 found++;
5695 }
5696 if (found)
5697 return;
5698
5699 /* otherwise we will clear the whole queue
5700 * by copying the empty outq at the end of this
5701 * function, but first clear the current entries
5702 * in the queue.
5703 */
5704 for (i = 0; i < q->nr; i++)
5705 diff_free_filepair(q->queue[i]);
5706 }
5707 else {
5708 /* Only the matching ones */
5709 for (i = 0; i < q->nr; i++) {
5710 struct diff_filepair *p = q->queue[i];
5711 if (match_filter(options, p))
5712 diff_q(&outq, p);
5713 else
5714 diff_free_filepair(p);
5715 }
5716 }
5717 free(q->queue);
5718 *q = outq;
5719 }
5720
5721 /* Check whether two filespecs with the same mode and size are identical */
5722 static int diff_filespec_is_identical(struct diff_filespec *one,
5723 struct diff_filespec *two)
5724 {
5725 if (S_ISGITLINK(one->mode))
5726 return 0;
5727 if (diff_populate_filespec(one, 0))
5728 return 0;
5729 if (diff_populate_filespec(two, 0))
5730 return 0;
5731 return !memcmp(one->data, two->data, one->size);
5732 }
5733
5734 static int diff_filespec_check_stat_unmatch(struct diff_filepair *p)
5735 {
5736 if (p->done_skip_stat_unmatch)
5737 return p->skip_stat_unmatch_result;
5738
5739 p->done_skip_stat_unmatch = 1;
5740 p->skip_stat_unmatch_result = 0;
5741 /*
5742 * 1. Entries that come from stat info dirtiness
5743 * always have both sides (iow, not create/delete),
5744 * one side of the object name is unknown, with
5745 * the same mode and size. Keep the ones that
5746 * do not match these criteria. They have real
5747 * differences.
5748 *
5749 * 2. At this point, the file is known to be modified,
5750 * with the same mode and size, and the object
5751 * name of one side is unknown. Need to inspect
5752 * the identical contents.
5753 */
5754 if (!DIFF_FILE_VALID(p->one) || /* (1) */
5755 !DIFF_FILE_VALID(p->two) ||
5756 (p->one->oid_valid && p->two->oid_valid) ||
5757 (p->one->mode != p->two->mode) ||
5758 diff_populate_filespec(p->one, CHECK_SIZE_ONLY) ||
5759 diff_populate_filespec(p->two, CHECK_SIZE_ONLY) ||
5760 (p->one->size != p->two->size) ||
5761 !diff_filespec_is_identical(p->one, p->two)) /* (2) */
5762 p->skip_stat_unmatch_result = 1;
5763 return p->skip_stat_unmatch_result;
5764 }
5765
5766 static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
5767 {
5768 int i;
5769 struct diff_queue_struct *q = &diff_queued_diff;
5770 struct diff_queue_struct outq;
5771 DIFF_QUEUE_CLEAR(&outq);
5772
5773 for (i = 0; i < q->nr; i++) {
5774 struct diff_filepair *p = q->queue[i];
5775
5776 if (diff_filespec_check_stat_unmatch(p))
5777 diff_q(&outq, p);
5778 else {
5779 /*
5780 * The caller can subtract 1 from skip_stat_unmatch
5781 * to determine how many paths were dirty only
5782 * due to stat info mismatch.
5783 */
5784 if (!diffopt->flags.no_index)
5785 diffopt->skip_stat_unmatch++;
5786 diff_free_filepair(p);
5787 }
5788 }
5789 free(q->queue);
5790 *q = outq;
5791 }
5792
5793 static int diffnamecmp(const void *a_, const void *b_)
5794 {
5795 const struct diff_filepair *a = *((const struct diff_filepair **)a_);
5796 const struct diff_filepair *b = *((const struct diff_filepair **)b_);
5797 const char *name_a, *name_b;
5798
5799 name_a = a->one ? a->one->path : a->two->path;
5800 name_b = b->one ? b->one->path : b->two->path;
5801 return strcmp(name_a, name_b);
5802 }
5803
5804 void diffcore_fix_diff_index(struct diff_options *options)
5805 {
5806 struct diff_queue_struct *q = &diff_queued_diff;
5807 QSORT(q->queue, q->nr, diffnamecmp);
5808 }
5809
5810 void diffcore_std(struct diff_options *options)
5811 {
5812 /* NOTE please keep the following in sync with diff_tree_combined() */
5813 if (options->skip_stat_unmatch)
5814 diffcore_skip_stat_unmatch(options);
5815 if (!options->found_follow) {
5816 /* See try_to_follow_renames() in tree-diff.c */
5817 if (options->break_opt != -1)
5818 diffcore_break(options->break_opt);
5819 if (options->detect_rename)
5820 diffcore_rename(options);
5821 if (options->break_opt != -1)
5822 diffcore_merge_broken();
5823 }
5824 if (options->pickaxe_opts & DIFF_PICKAXE_KINDS_MASK)
5825 diffcore_pickaxe(options);
5826 if (options->orderfile)
5827 diffcore_order(options->orderfile);
5828 if (!options->found_follow)
5829 /* See try_to_follow_renames() in tree-diff.c */
5830 diff_resolve_rename_copy();
5831 diffcore_apply_filter(options);
5832
5833 if (diff_queued_diff.nr && !options->flags.diff_from_contents)
5834 options->flags.has_changes = 1;
5835 else
5836 options->flags.has_changes = 0;
5837
5838 options->found_follow = 0;
5839 }
5840
5841 int diff_result_code(struct diff_options *opt, int status)
5842 {
5843 int result = 0;
5844
5845 diff_warn_rename_limit("diff.renameLimit",
5846 opt->needed_rename_limit,
5847 opt->degraded_cc_to_c);
5848 if (!opt->flags.exit_with_status &&
5849 !(opt->output_format & DIFF_FORMAT_CHECKDIFF))
5850 return status;
5851 if (opt->flags.exit_with_status &&
5852 opt->flags.has_changes)
5853 result |= 01;
5854 if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) &&
5855 opt->flags.check_failed)
5856 result |= 02;
5857 return result;
5858 }
5859
5860 int diff_can_quit_early(struct diff_options *opt)
5861 {
5862 return (opt->flags.quick &&
5863 !opt->filter &&
5864 opt->flags.has_changes);
5865 }
5866
5867 /*
5868 * Shall changes to this submodule be ignored?
5869 *
5870 * Submodule changes can be configured to be ignored separately for each path,
5871 * but that configuration can be overridden from the command line.
5872 */
5873 static int is_submodule_ignored(const char *path, struct diff_options *options)
5874 {
5875 int ignored = 0;
5876 struct diff_flags orig_flags = options->flags;
5877 if (!options->flags.override_submodule_config)
5878 set_diffopt_flags_from_submodule_config(options, path);
5879 if (options->flags.ignore_submodules)
5880 ignored = 1;
5881 options->flags = orig_flags;
5882 return ignored;
5883 }
5884
5885 void diff_addremove(struct diff_options *options,
5886 int addremove, unsigned mode,
5887 const struct object_id *oid,
5888 int oid_valid,
5889 const char *concatpath, unsigned dirty_submodule)
5890 {
5891 struct diff_filespec *one, *two;
5892
5893 if (S_ISGITLINK(mode) && is_submodule_ignored(concatpath, options))
5894 return;
5895
5896 /* This may look odd, but it is a preparation for
5897 * feeding "there are unchanged files which should
5898 * not produce diffs, but when you are doing copy
5899 * detection you would need them, so here they are"
5900 * entries to the diff-core. They will be prefixed
5901 * with something like '=' or '*' (I haven't decided
5902 * which but should not make any difference).
5903 * Feeding the same new and old to diff_change()
5904 * also has the same effect.
5905 * Before the final output happens, they are pruned after
5906 * merged into rename/copy pairs as appropriate.
5907 */
5908 if (options->flags.reverse_diff)
5909 addremove = (addremove == '+' ? '-' :
5910 addremove == '-' ? '+' : addremove);
5911
5912 if (options->prefix &&
5913 strncmp(concatpath, options->prefix, options->prefix_length))
5914 return;
5915
5916 one = alloc_filespec(concatpath);
5917 two = alloc_filespec(concatpath);
5918
5919 if (addremove != '+')
5920 fill_filespec(one, oid, oid_valid, mode);
5921 if (addremove != '-') {
5922 fill_filespec(two, oid, oid_valid, mode);
5923 two->dirty_submodule = dirty_submodule;
5924 }
5925
5926 diff_queue(&diff_queued_diff, one, two);
5927 if (!options->flags.diff_from_contents)
5928 options->flags.has_changes = 1;
5929 }
5930
5931 void diff_change(struct diff_options *options,
5932 unsigned old_mode, unsigned new_mode,
5933 const struct object_id *old_oid,
5934 const struct object_id *new_oid,
5935 int old_oid_valid, int new_oid_valid,
5936 const char *concatpath,
5937 unsigned old_dirty_submodule, unsigned new_dirty_submodule)
5938 {
5939 struct diff_filespec *one, *two;
5940 struct diff_filepair *p;
5941
5942 if (S_ISGITLINK(old_mode) && S_ISGITLINK(new_mode) &&
5943 is_submodule_ignored(concatpath, options))
5944 return;
5945
5946 if (options->flags.reverse_diff) {
5947 SWAP(old_mode, new_mode);
5948 SWAP(old_oid, new_oid);
5949 SWAP(old_oid_valid, new_oid_valid);
5950 SWAP(old_dirty_submodule, new_dirty_submodule);
5951 }
5952
5953 if (options->prefix &&
5954 strncmp(concatpath, options->prefix, options->prefix_length))
5955 return;
5956
5957 one = alloc_filespec(concatpath);
5958 two = alloc_filespec(concatpath);
5959 fill_filespec(one, old_oid, old_oid_valid, old_mode);
5960 fill_filespec(two, new_oid, new_oid_valid, new_mode);
5961 one->dirty_submodule = old_dirty_submodule;
5962 two->dirty_submodule = new_dirty_submodule;
5963 p = diff_queue(&diff_queued_diff, one, two);
5964
5965 if (options->flags.diff_from_contents)
5966 return;
5967
5968 if (options->flags.quick && options->skip_stat_unmatch &&
5969 !diff_filespec_check_stat_unmatch(p))
5970 return;
5971
5972 options->flags.has_changes = 1;
5973 }
5974
5975 struct diff_filepair *diff_unmerge(struct diff_options *options, const char *path)
5976 {
5977 struct diff_filepair *pair;
5978 struct diff_filespec *one, *two;
5979
5980 if (options->prefix &&
5981 strncmp(path, options->prefix, options->prefix_length))
5982 return NULL;
5983
5984 one = alloc_filespec(path);
5985 two = alloc_filespec(path);
5986 pair = diff_queue(&diff_queued_diff, one, two);
5987 pair->is_unmerged = 1;
5988 return pair;
5989 }
5990
5991 static char *run_textconv(const char *pgm, struct diff_filespec *spec,
5992 size_t *outsize)
5993 {
5994 struct diff_tempfile *temp;
5995 const char *argv[3];
5996 const char **arg = argv;
5997 struct child_process child = CHILD_PROCESS_INIT;
5998 struct strbuf buf = STRBUF_INIT;
5999 int err = 0;
6000
6001 temp = prepare_temp_file(spec->path, spec);
6002 *arg++ = pgm;
6003 *arg++ = temp->name;
6004 *arg = NULL;
6005
6006 child.use_shell = 1;
6007 child.argv = argv;
6008 child.out = -1;
6009 if (start_command(&child)) {
6010 remove_tempfile();
6011 return NULL;
6012 }
6013
6014 if (strbuf_read(&buf, child.out, 0) < 0)
6015 err = error("error reading from textconv command '%s'", pgm);
6016 close(child.out);
6017
6018 if (finish_command(&child) || err) {
6019 strbuf_release(&buf);
6020 remove_tempfile();
6021 return NULL;
6022 }
6023 remove_tempfile();
6024
6025 return strbuf_detach(&buf, outsize);
6026 }
6027
6028 size_t fill_textconv(struct userdiff_driver *driver,
6029 struct diff_filespec *df,
6030 char **outbuf)
6031 {
6032 size_t size;
6033
6034 if (!driver) {
6035 if (!DIFF_FILE_VALID(df)) {
6036 *outbuf = "";
6037 return 0;
6038 }
6039 if (diff_populate_filespec(df, 0))
6040 die("unable to read files to diff");
6041 *outbuf = df->data;
6042 return df->size;
6043 }
6044
6045 if (!driver->textconv)
6046 die("BUG: fill_textconv called with non-textconv driver");
6047
6048 if (driver->textconv_cache && df->oid_valid) {
6049 *outbuf = notes_cache_get(driver->textconv_cache,
6050 &df->oid,
6051 &size);
6052 if (*outbuf)
6053 return size;
6054 }
6055
6056 *outbuf = run_textconv(driver->textconv, df, &size);
6057 if (!*outbuf)
6058 die("unable to read files to diff");
6059
6060 if (driver->textconv_cache && df->oid_valid) {
6061 /* ignore errors, as we might be in a readonly repository */
6062 notes_cache_put(driver->textconv_cache, &df->oid, *outbuf,
6063 size);
6064 /*
6065 * we could save up changes and flush them all at the end,
6066 * but we would need an extra call after all diffing is done.
6067 * Since generating a cache entry is the slow path anyway,
6068 * this extra overhead probably isn't a big deal.
6069 */
6070 notes_cache_write(driver->textconv_cache);
6071 }
6072
6073 return size;
6074 }
6075
6076 int textconv_object(const char *path,
6077 unsigned mode,
6078 const struct object_id *oid,
6079 int oid_valid,
6080 char **buf,
6081 unsigned long *buf_size)
6082 {
6083 struct diff_filespec *df;
6084 struct userdiff_driver *textconv;
6085
6086 df = alloc_filespec(path);
6087 fill_filespec(df, oid, oid_valid, mode);
6088 textconv = get_textconv(df);
6089 if (!textconv) {
6090 free_filespec(df);
6091 return 0;
6092 }
6093
6094 *buf_size = fill_textconv(textconv, df, buf);
6095 free_filespec(df);
6096 return 1;
6097 }
6098
6099 void setup_diff_pager(struct diff_options *opt)
6100 {
6101 /*
6102 * If the user asked for our exit code, then either they want --quiet
6103 * or --exit-code. We should definitely not bother with a pager in the
6104 * former case, as we will generate no output. Since we still properly
6105 * report our exit code even when a pager is run, we _could_ run a
6106 * pager with --exit-code. But since we have not done so historically,
6107 * and because it is easy to find people oneline advising "git diff
6108 * --exit-code" in hooks and other scripts, we do not do so.
6109 */
6110 if (!opt->flags.exit_with_status &&
6111 check_pager_config("diff") != 0)
6112 setup_pager();
6113 }
Unnamed repository; edit this file 'description' to name the repository.