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Merge branch 'tg/conflict-marker-size'
[git/debian.git] / diff.c
blob145cfbae5929c69224f9f9e5bc473f2a221603de
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 "object-store.h"
17 #include "userdiff.h"
18 #include "submodule-config.h"
19 #include "submodule.h"
20 #include "hashmap.h"
21 #include "ll-merge.h"
22 #include "string-list.h"
23 #include "argv-array.h"
24 #include "graph.h"
25 #include "packfile.h"
26 #include "help.h"
27
28 #ifdef NO_FAST_WORKING_DIRECTORY
29 #define FAST_WORKING_DIRECTORY 0
30 #else
31 #define FAST_WORKING_DIRECTORY 1
32 #endif
33
34 static int diff_detect_rename_default;
35 static int diff_indent_heuristic = 1;
36 static int diff_rename_limit_default = 400;
37 static int diff_suppress_blank_empty;
38 static int diff_use_color_default = -1;
39 static int diff_color_moved_default;
40 static int diff_color_moved_ws_default;
41 static int diff_context_default = 3;
42 static int diff_interhunk_context_default;
43 static const char *diff_word_regex_cfg;
44 static const char *external_diff_cmd_cfg;
45 static const char *diff_order_file_cfg;
46 int diff_auto_refresh_index = 1;
47 static int diff_mnemonic_prefix;
48 static int diff_no_prefix;
49 static int diff_stat_graph_width;
50 static int diff_dirstat_permille_default = 30;
51 static struct diff_options default_diff_options;
52 static long diff_algorithm;
53 static unsigned ws_error_highlight_default = WSEH_NEW;
54
55 static char diff_colors[][COLOR_MAXLEN] = {
56 GIT_COLOR_RESET,
57 GIT_COLOR_NORMAL, /* CONTEXT */
58 GIT_COLOR_BOLD, /* METAINFO */
59 GIT_COLOR_CYAN, /* FRAGINFO */
60 GIT_COLOR_RED, /* OLD */
61 GIT_COLOR_GREEN, /* NEW */
62 GIT_COLOR_YELLOW, /* COMMIT */
63 GIT_COLOR_BG_RED, /* WHITESPACE */
64 GIT_COLOR_NORMAL, /* FUNCINFO */
65 GIT_COLOR_BOLD_MAGENTA, /* OLD_MOVED */
66 GIT_COLOR_BOLD_BLUE, /* OLD_MOVED ALTERNATIVE */
67 GIT_COLOR_FAINT, /* OLD_MOVED_DIM */
68 GIT_COLOR_FAINT_ITALIC, /* OLD_MOVED_ALTERNATIVE_DIM */
69 GIT_COLOR_BOLD_CYAN, /* NEW_MOVED */
70 GIT_COLOR_BOLD_YELLOW, /* NEW_MOVED ALTERNATIVE */
71 GIT_COLOR_FAINT, /* NEW_MOVED_DIM */
72 GIT_COLOR_FAINT_ITALIC, /* NEW_MOVED_ALTERNATIVE_DIM */
73 GIT_COLOR_FAINT, /* CONTEXT_DIM */
74 GIT_COLOR_FAINT_RED, /* OLD_DIM */
75 GIT_COLOR_FAINT_GREEN, /* NEW_DIM */
76 GIT_COLOR_BOLD, /* CONTEXT_BOLD */
77 GIT_COLOR_BOLD_RED, /* OLD_BOLD */
78 GIT_COLOR_BOLD_GREEN, /* NEW_BOLD */
79 };
80
81 static const char *color_diff_slots[] = {
82 [DIFF_CONTEXT] = "context",
83 [DIFF_METAINFO] = "meta",
84 [DIFF_FRAGINFO] = "frag",
85 [DIFF_FILE_OLD] = "old",
86 [DIFF_FILE_NEW] = "new",
87 [DIFF_COMMIT] = "commit",
88 [DIFF_WHITESPACE] = "whitespace",
89 [DIFF_FUNCINFO] = "func",
90 [DIFF_FILE_OLD_MOVED] = "oldMoved",
91 [DIFF_FILE_OLD_MOVED_ALT] = "oldMovedAlternative",
92 [DIFF_FILE_OLD_MOVED_DIM] = "oldMovedDimmed",
93 [DIFF_FILE_OLD_MOVED_ALT_DIM] = "oldMovedAlternativeDimmed",
94 [DIFF_FILE_NEW_MOVED] = "newMoved",
95 [DIFF_FILE_NEW_MOVED_ALT] = "newMovedAlternative",
96 [DIFF_FILE_NEW_MOVED_DIM] = "newMovedDimmed",
97 [DIFF_FILE_NEW_MOVED_ALT_DIM] = "newMovedAlternativeDimmed",
98 [DIFF_CONTEXT_DIM] = "contextDimmed",
99 [DIFF_FILE_OLD_DIM] = "oldDimmed",
100 [DIFF_FILE_NEW_DIM] = "newDimmed",
101 [DIFF_CONTEXT_BOLD] = "contextBold",
102 [DIFF_FILE_OLD_BOLD] = "oldBold",
103 [DIFF_FILE_NEW_BOLD] = "newBold",
104 };
105
106 static NORETURN void die_want_option(const char *option_name)
107 {
108 die(_("option '%s' requires a value"), option_name);
109 }
110
111 define_list_config_array_extra(color_diff_slots, {"plain"});
112
113 static int parse_diff_color_slot(const char *var)
114 {
115 if (!strcasecmp(var, "plain"))
116 return DIFF_CONTEXT;
117 return LOOKUP_CONFIG(color_diff_slots, var);
118 }
119
120 static int parse_dirstat_params(struct diff_options *options, const char *params_string,
121 struct strbuf *errmsg)
122 {
123 char *params_copy = xstrdup(params_string);
124 struct string_list params = STRING_LIST_INIT_NODUP;
125 int ret = 0;
126 int i;
127
128 if (*params_copy)
129 string_list_split_in_place(&params, params_copy, ',', -1);
130 for (i = 0; i < params.nr; i++) {
131 const char *p = params.items[i].string;
132 if (!strcmp(p, "changes")) {
133 options->flags.dirstat_by_line = 0;
134 options->flags.dirstat_by_file = 0;
135 } else if (!strcmp(p, "lines")) {
136 options->flags.dirstat_by_line = 1;
137 options->flags.dirstat_by_file = 0;
138 } else if (!strcmp(p, "files")) {
139 options->flags.dirstat_by_line = 0;
140 options->flags.dirstat_by_file = 1;
141 } else if (!strcmp(p, "noncumulative")) {
142 options->flags.dirstat_cumulative = 0;
143 } else if (!strcmp(p, "cumulative")) {
144 options->flags.dirstat_cumulative = 1;
145 } else if (isdigit(*p)) {
146 char *end;
147 int permille = strtoul(p, &end, 10) * 10;
148 if (*end == '.' && isdigit(*++end)) {
149 /* only use first digit */
150 permille += *end - '0';
151 /* .. and ignore any further digits */
152 while (isdigit(*++end))
153 ; /* nothing */
154 }
155 if (!*end)
156 options->dirstat_permille = permille;
157 else {
158 strbuf_addf(errmsg, _(" Failed to parse dirstat cut-off percentage '%s'\n"),
159 p);
160 ret++;
161 }
162 } else {
163 strbuf_addf(errmsg, _(" Unknown dirstat parameter '%s'\n"), p);
164 ret++;
165 }
166
167 }
168 string_list_clear(&params, 0);
169 free(params_copy);
170 return ret;
171 }
172
173 static int parse_submodule_params(struct diff_options *options, const char *value)
174 {
175 if (!strcmp(value, "log"))
176 options->submodule_format = DIFF_SUBMODULE_LOG;
177 else if (!strcmp(value, "short"))
178 options->submodule_format = DIFF_SUBMODULE_SHORT;
179 else if (!strcmp(value, "diff"))
180 options->submodule_format = DIFF_SUBMODULE_INLINE_DIFF;
181 else
182 return -1;
183 return 0;
184 }
185
186 int git_config_rename(const char *var, const char *value)
187 {
188 if (!value)
189 return DIFF_DETECT_RENAME;
190 if (!strcasecmp(value, "copies") || !strcasecmp(value, "copy"))
191 return DIFF_DETECT_COPY;
192 return git_config_bool(var,value) ? DIFF_DETECT_RENAME : 0;
193 }
194
195 long parse_algorithm_value(const char *value)
196 {
197 if (!value)
198 return -1;
199 else if (!strcasecmp(value, "myers") || !strcasecmp(value, "default"))
200 return 0;
201 else if (!strcasecmp(value, "minimal"))
202 return XDF_NEED_MINIMAL;
203 else if (!strcasecmp(value, "patience"))
204 return XDF_PATIENCE_DIFF;
205 else if (!strcasecmp(value, "histogram"))
206 return XDF_HISTOGRAM_DIFF;
207 return -1;
208 }
209
210 static int parse_one_token(const char **arg, const char *token)
211 {
212 const char *rest;
213 if (skip_prefix(*arg, token, &rest) && (!*rest || *rest == ',')) {
214 *arg = rest;
215 return 1;
216 }
217 return 0;
218 }
219
220 static int parse_ws_error_highlight(const char *arg)
221 {
222 const char *orig_arg = arg;
223 unsigned val = 0;
224
225 while (*arg) {
226 if (parse_one_token(&arg, "none"))
227 val = 0;
228 else if (parse_one_token(&arg, "default"))
229 val = WSEH_NEW;
230 else if (parse_one_token(&arg, "all"))
231 val = WSEH_NEW | WSEH_OLD | WSEH_CONTEXT;
232 else if (parse_one_token(&arg, "new"))
233 val |= WSEH_NEW;
234 else if (parse_one_token(&arg, "old"))
235 val |= WSEH_OLD;
236 else if (parse_one_token(&arg, "context"))
237 val |= WSEH_CONTEXT;
238 else {
239 return -1 - (int)(arg - orig_arg);
240 }
241 if (*arg)
242 arg++;
243 }
244 return val;
245 }
246
247 /*
248 * These are to give UI layer defaults.
249 * The core-level commands such as git-diff-files should
250 * never be affected by the setting of diff.renames
251 * the user happens to have in the configuration file.
252 */
253 void init_diff_ui_defaults(void)
254 {
255 diff_detect_rename_default = DIFF_DETECT_RENAME;
256 }
257
258 int git_diff_heuristic_config(const char *var, const char *value, void *cb)
259 {
260 if (!strcmp(var, "diff.indentheuristic"))
261 diff_indent_heuristic = git_config_bool(var, value);
262 return 0;
263 }
264
265 static int parse_color_moved(const char *arg)
266 {
267 switch (git_parse_maybe_bool(arg)) {
268 case 0:
269 return COLOR_MOVED_NO;
270 case 1:
271 return COLOR_MOVED_DEFAULT;
272 default:
273 break;
274 }
275
276 if (!strcmp(arg, "no"))
277 return COLOR_MOVED_NO;
278 else if (!strcmp(arg, "plain"))
279 return COLOR_MOVED_PLAIN;
280 else if (!strcmp(arg, "blocks"))
281 return COLOR_MOVED_BLOCKS;
282 else if (!strcmp(arg, "zebra"))
283 return COLOR_MOVED_ZEBRA;
284 else if (!strcmp(arg, "default"))
285 return COLOR_MOVED_DEFAULT;
286 else if (!strcmp(arg, "dimmed-zebra"))
287 return COLOR_MOVED_ZEBRA_DIM;
288 else if (!strcmp(arg, "dimmed_zebra"))
289 return COLOR_MOVED_ZEBRA_DIM;
290 else
291 return error(_("color moved setting must be one of 'no', 'default', 'blocks', 'zebra', 'dimmed-zebra', 'plain'"));
292 }
293
294 static int parse_color_moved_ws(const char *arg)
295 {
296 int ret = 0;
297 struct string_list l = STRING_LIST_INIT_DUP;
298 struct string_list_item *i;
299
300 string_list_split(&l, arg, ',', -1);
301
302 for_each_string_list_item(i, &l) {
303 struct strbuf sb = STRBUF_INIT;
304 strbuf_addstr(&sb, i->string);
305 strbuf_trim(&sb);
306
307 if (!strcmp(sb.buf, "ignore-space-change"))
308 ret |= XDF_IGNORE_WHITESPACE_CHANGE;
309 else if (!strcmp(sb.buf, "ignore-space-at-eol"))
310 ret |= XDF_IGNORE_WHITESPACE_AT_EOL;
311 else if (!strcmp(sb.buf, "ignore-all-space"))
312 ret |= XDF_IGNORE_WHITESPACE;
313 else if (!strcmp(sb.buf, "allow-indentation-change"))
314 ret |= COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE;
315 else
316 error(_("ignoring unknown color-moved-ws mode '%s'"), sb.buf);
317
318 strbuf_release(&sb);
319 }
320
321 if ((ret & COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE) &&
322 (ret & XDF_WHITESPACE_FLAGS))
323 die(_("color-moved-ws: allow-indentation-change cannot be combined with other white space modes"));
324
325 string_list_clear(&l, 0);
326
327 return ret;
328 }
329
330 int git_diff_ui_config(const char *var, const char *value, void *cb)
331 {
332 if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
333 diff_use_color_default = git_config_colorbool(var, value);
334 return 0;
335 }
336 if (!strcmp(var, "diff.colormoved")) {
337 int cm = parse_color_moved(value);
338 if (cm < 0)
339 return -1;
340 diff_color_moved_default = cm;
341 return 0;
342 }
343 if (!strcmp(var, "diff.colormovedws")) {
344 int cm = parse_color_moved_ws(value);
345 if (cm < 0)
346 return -1;
347 diff_color_moved_ws_default = cm;
348 return 0;
349 }
350 if (!strcmp(var, "diff.context")) {
351 diff_context_default = git_config_int(var, value);
352 if (diff_context_default < 0)
353 return -1;
354 return 0;
355 }
356 if (!strcmp(var, "diff.interhunkcontext")) {
357 diff_interhunk_context_default = git_config_int(var, value);
358 if (diff_interhunk_context_default < 0)
359 return -1;
360 return 0;
361 }
362 if (!strcmp(var, "diff.renames")) {
363 diff_detect_rename_default = git_config_rename(var, value);
364 return 0;
365 }
366 if (!strcmp(var, "diff.autorefreshindex")) {
367 diff_auto_refresh_index = git_config_bool(var, value);
368 return 0;
369 }
370 if (!strcmp(var, "diff.mnemonicprefix")) {
371 diff_mnemonic_prefix = git_config_bool(var, value);
372 return 0;
373 }
374 if (!strcmp(var, "diff.noprefix")) {
375 diff_no_prefix = git_config_bool(var, value);
376 return 0;
377 }
378 if (!strcmp(var, "diff.statgraphwidth")) {
379 diff_stat_graph_width = git_config_int(var, value);
380 return 0;
381 }
382 if (!strcmp(var, "diff.external"))
383 return git_config_string(&external_diff_cmd_cfg, var, value);
384 if (!strcmp(var, "diff.wordregex"))
385 return git_config_string(&diff_word_regex_cfg, var, value);
386 if (!strcmp(var, "diff.orderfile"))
387 return git_config_pathname(&diff_order_file_cfg, var, value);
388
389 if (!strcmp(var, "diff.ignoresubmodules"))
390 handle_ignore_submodules_arg(&default_diff_options, value);
391
392 if (!strcmp(var, "diff.submodule")) {
393 if (parse_submodule_params(&default_diff_options, value))
394 warning(_("Unknown value for 'diff.submodule' config variable: '%s'"),
395 value);
396 return 0;
397 }
398
399 if (!strcmp(var, "diff.algorithm")) {
400 diff_algorithm = parse_algorithm_value(value);
401 if (diff_algorithm < 0)
402 return -1;
403 return 0;
404 }
405
406 if (!strcmp(var, "diff.wserrorhighlight")) {
407 int val = parse_ws_error_highlight(value);
408 if (val < 0)
409 return -1;
410 ws_error_highlight_default = val;
411 return 0;
412 }
413
414 if (git_color_config(var, value, cb) < 0)
415 return -1;
416
417 return git_diff_basic_config(var, value, cb);
418 }
419
420 int git_diff_basic_config(const char *var, const char *value, void *cb)
421 {
422 const char *name;
423
424 if (!strcmp(var, "diff.renamelimit")) {
425 diff_rename_limit_default = git_config_int(var, value);
426 return 0;
427 }
428
429 if (userdiff_config(var, value) < 0)
430 return -1;
431
432 if (skip_prefix(var, "diff.color.", &name) ||
433 skip_prefix(var, "color.diff.", &name)) {
434 int slot = parse_diff_color_slot(name);
435 if (slot < 0)
436 return 0;
437 if (!value)
438 return config_error_nonbool(var);
439 return color_parse(value, diff_colors[slot]);
440 }
441
442 /* like GNU diff's --suppress-blank-empty option */
443 if (!strcmp(var, "diff.suppressblankempty") ||
444 /* for backwards compatibility */
445 !strcmp(var, "diff.suppress-blank-empty")) {
446 diff_suppress_blank_empty = git_config_bool(var, value);
447 return 0;
448 }
449
450 if (!strcmp(var, "diff.dirstat")) {
451 struct strbuf errmsg = STRBUF_INIT;
452 default_diff_options.dirstat_permille = diff_dirstat_permille_default;
453 if (parse_dirstat_params(&default_diff_options, value, &errmsg))
454 warning(_("Found errors in 'diff.dirstat' config variable:\n%s"),
455 errmsg.buf);
456 strbuf_release(&errmsg);
457 diff_dirstat_permille_default = default_diff_options.dirstat_permille;
458 return 0;
459 }
460
461 if (git_diff_heuristic_config(var, value, cb) < 0)
462 return -1;
463
464 return git_default_config(var, value, cb);
465 }
466
467 static char *quote_two(const char *one, const char *two)
468 {
469 int need_one = quote_c_style(one, NULL, NULL, 1);
470 int need_two = quote_c_style(two, NULL, NULL, 1);
471 struct strbuf res = STRBUF_INIT;
472
473 if (need_one + need_two) {
474 strbuf_addch(&res, '"');
475 quote_c_style(one, &res, NULL, 1);
476 quote_c_style(two, &res, NULL, 1);
477 strbuf_addch(&res, '"');
478 } else {
479 strbuf_addstr(&res, one);
480 strbuf_addstr(&res, two);
481 }
482 return strbuf_detach(&res, NULL);
483 }
484
485 static const char *external_diff(void)
486 {
487 static const char *external_diff_cmd = NULL;
488 static int done_preparing = 0;
489
490 if (done_preparing)
491 return external_diff_cmd;
492 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
493 if (!external_diff_cmd)
494 external_diff_cmd = external_diff_cmd_cfg;
495 done_preparing = 1;
496 return external_diff_cmd;
497 }
498
499 /*
500 * Keep track of files used for diffing. Sometimes such an entry
501 * refers to a temporary file, sometimes to an existing file, and
502 * sometimes to "/dev/null".
503 */
504 static struct diff_tempfile {
505 /*
506 * filename external diff should read from, or NULL if this
507 * entry is currently not in use:
508 */
509 const char *name;
510
511 char hex[GIT_MAX_HEXSZ + 1];
512 char mode[10];
513
514 /*
515 * If this diff_tempfile instance refers to a temporary file,
516 * this tempfile object is used to manage its lifetime.
517 */
518 struct tempfile *tempfile;
519 } diff_temp[2];
520
521 struct emit_callback {
522 int color_diff;
523 unsigned ws_rule;
524 int blank_at_eof_in_preimage;
525 int blank_at_eof_in_postimage;
526 int lno_in_preimage;
527 int lno_in_postimage;
528 const char **label_path;
529 struct diff_words_data *diff_words;
530 struct diff_options *opt;
531 struct strbuf *header;
532 };
533
534 static int count_lines(const char *data, int size)
535 {
536 int count, ch, completely_empty = 1, nl_just_seen = 0;
537 count = 0;
538 while (0 < size--) {
539 ch = *data++;
540 if (ch == '\n') {
541 count++;
542 nl_just_seen = 1;
543 completely_empty = 0;
544 }
545 else {
546 nl_just_seen = 0;
547 completely_empty = 0;
548 }
549 }
550 if (completely_empty)
551 return 0;
552 if (!nl_just_seen)
553 count++; /* no trailing newline */
554 return count;
555 }
556
557 static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
558 {
559 if (!DIFF_FILE_VALID(one)) {
560 mf->ptr = (char *)""; /* does not matter */
561 mf->size = 0;
562 return 0;
563 }
564 else if (diff_populate_filespec(one, 0))
565 return -1;
566
567 mf->ptr = one->data;
568 mf->size = one->size;
569 return 0;
570 }
571
572 /* like fill_mmfile, but only for size, so we can avoid retrieving blob */
573 static unsigned long diff_filespec_size(struct diff_filespec *one)
574 {
575 if (!DIFF_FILE_VALID(one))
576 return 0;
577 diff_populate_filespec(one, CHECK_SIZE_ONLY);
578 return one->size;
579 }
580
581 static int count_trailing_blank(mmfile_t *mf, unsigned ws_rule)
582 {
583 char *ptr = mf->ptr;
584 long size = mf->size;
585 int cnt = 0;
586
587 if (!size)
588 return cnt;
589 ptr += size - 1; /* pointing at the very end */
590 if (*ptr != '\n')
591 ; /* incomplete line */
592 else
593 ptr--; /* skip the last LF */
594 while (mf->ptr < ptr) {
595 char *prev_eol;
596 for (prev_eol = ptr; mf->ptr <= prev_eol; prev_eol--)
597 if (*prev_eol == '\n')
598 break;
599 if (!ws_blank_line(prev_eol + 1, ptr - prev_eol, ws_rule))
600 break;
601 cnt++;
602 ptr = prev_eol - 1;
603 }
604 return cnt;
605 }
606
607 static void check_blank_at_eof(mmfile_t *mf1, mmfile_t *mf2,
608 struct emit_callback *ecbdata)
609 {
610 int l1, l2, at;
611 unsigned ws_rule = ecbdata->ws_rule;
612 l1 = count_trailing_blank(mf1, ws_rule);
613 l2 = count_trailing_blank(mf2, ws_rule);
614 if (l2 <= l1) {
615 ecbdata->blank_at_eof_in_preimage = 0;
616 ecbdata->blank_at_eof_in_postimage = 0;
617 return;
618 }
619 at = count_lines(mf1->ptr, mf1->size);
620 ecbdata->blank_at_eof_in_preimage = (at - l1) + 1;
621
622 at = count_lines(mf2->ptr, mf2->size);
623 ecbdata->blank_at_eof_in_postimage = (at - l2) + 1;
624 }
625
626 static void emit_line_0(struct diff_options *o,
627 const char *set, unsigned reverse, const char *reset,
628 int first, const char *line, int len)
629 {
630 int has_trailing_newline, has_trailing_carriage_return;
631 int nofirst;
632 FILE *file = o->file;
633
634 if (first)
635 fputs(diff_line_prefix(o), file);
636 else if (!len)
637 return;
638
639 if (len == 0) {
640 has_trailing_newline = (first == '\n');
641 has_trailing_carriage_return = (!has_trailing_newline &&
642 (first == '\r'));
643 nofirst = has_trailing_newline || has_trailing_carriage_return;
644 } else {
645 has_trailing_newline = (len > 0 && line[len-1] == '\n');
646 if (has_trailing_newline)
647 len--;
648 has_trailing_carriage_return = (len > 0 && line[len-1] == '\r');
649 if (has_trailing_carriage_return)
650 len--;
651 nofirst = 0;
652 }
653
654 if (len || !nofirst) {
655 if (reverse && want_color(o->use_color))
656 fputs(GIT_COLOR_REVERSE, file);
657 fputs(set, file);
658 if (first && !nofirst)
659 fputc(first, file);
660 fwrite(line, len, 1, file);
661 fputs(reset, file);
662 }
663 if (has_trailing_carriage_return)
664 fputc('\r', file);
665 if (has_trailing_newline)
666 fputc('\n', file);
667 }
668
669 static void emit_line(struct diff_options *o, const char *set, const char *reset,
670 const char *line, int len)
671 {
672 emit_line_0(o, set, 0, reset, line[0], line+1, len-1);
673 }
674
675 enum diff_symbol {
676 DIFF_SYMBOL_BINARY_DIFF_HEADER,
677 DIFF_SYMBOL_BINARY_DIFF_HEADER_DELTA,
678 DIFF_SYMBOL_BINARY_DIFF_HEADER_LITERAL,
679 DIFF_SYMBOL_BINARY_DIFF_BODY,
680 DIFF_SYMBOL_BINARY_DIFF_FOOTER,
681 DIFF_SYMBOL_STATS_SUMMARY_NO_FILES,
682 DIFF_SYMBOL_STATS_SUMMARY_ABBREV,
683 DIFF_SYMBOL_STATS_SUMMARY_INSERTS_DELETES,
684 DIFF_SYMBOL_STATS_LINE,
685 DIFF_SYMBOL_WORD_DIFF,
686 DIFF_SYMBOL_STAT_SEP,
687 DIFF_SYMBOL_SUMMARY,
688 DIFF_SYMBOL_SUBMODULE_ADD,
689 DIFF_SYMBOL_SUBMODULE_DEL,
690 DIFF_SYMBOL_SUBMODULE_UNTRACKED,
691 DIFF_SYMBOL_SUBMODULE_MODIFIED,
692 DIFF_SYMBOL_SUBMODULE_HEADER,
693 DIFF_SYMBOL_SUBMODULE_ERROR,
694 DIFF_SYMBOL_SUBMODULE_PIPETHROUGH,
695 DIFF_SYMBOL_REWRITE_DIFF,
696 DIFF_SYMBOL_BINARY_FILES,
697 DIFF_SYMBOL_HEADER,
698 DIFF_SYMBOL_FILEPAIR_PLUS,
699 DIFF_SYMBOL_FILEPAIR_MINUS,
700 DIFF_SYMBOL_WORDS_PORCELAIN,
701 DIFF_SYMBOL_WORDS,
702 DIFF_SYMBOL_CONTEXT,
703 DIFF_SYMBOL_CONTEXT_INCOMPLETE,
704 DIFF_SYMBOL_PLUS,
705 DIFF_SYMBOL_MINUS,
706 DIFF_SYMBOL_NO_LF_EOF,
707 DIFF_SYMBOL_CONTEXT_FRAGINFO,
708 DIFF_SYMBOL_CONTEXT_MARKER,
709 DIFF_SYMBOL_SEPARATOR
710 };
711 /*
712 * Flags for content lines:
713 * 0..12 are whitespace rules
714 * 13-15 are WSEH_NEW | WSEH_OLD | WSEH_CONTEXT
715 * 16 is marking if the line is blank at EOF
716 */
717 #define DIFF_SYMBOL_CONTENT_BLANK_LINE_EOF (1<<16)
718 #define DIFF_SYMBOL_MOVED_LINE (1<<17)
719 #define DIFF_SYMBOL_MOVED_LINE_ALT (1<<18)
720 #define DIFF_SYMBOL_MOVED_LINE_UNINTERESTING (1<<19)
721 #define DIFF_SYMBOL_CONTENT_WS_MASK (WSEH_NEW | WSEH_OLD | WSEH_CONTEXT | WS_RULE_MASK)
722
723 /*
724 * This struct is used when we need to buffer the output of the diff output.
725 *
726 * NEEDSWORK: Instead of storing a copy of the line, add an offset pointer
727 * into the pre/post image file. This pointer could be a union with the
728 * line pointer. By storing an offset into the file instead of the literal line,
729 * we can decrease the memory footprint for the buffered output. At first we
730 * may want to only have indirection for the content lines, but we could also
731 * enhance the state for emitting prefabricated lines, e.g. the similarity
732 * score line or hunk/file headers would only need to store a number or path
733 * and then the output can be constructed later on depending on state.
734 */
735 struct emitted_diff_symbol {
736 const char *line;
737 int len;
738 int flags;
739 enum diff_symbol s;
740 };
741 #define EMITTED_DIFF_SYMBOL_INIT {NULL}
742
743 struct emitted_diff_symbols {
744 struct emitted_diff_symbol *buf;
745 int nr, alloc;
746 };
747 #define EMITTED_DIFF_SYMBOLS_INIT {NULL, 0, 0}
748
749 static void append_emitted_diff_symbol(struct diff_options *o,
750 struct emitted_diff_symbol *e)
751 {
752 struct emitted_diff_symbol *f;
753
754 ALLOC_GROW(o->emitted_symbols->buf,
755 o->emitted_symbols->nr + 1,
756 o->emitted_symbols->alloc);
757 f = &o->emitted_symbols->buf[o->emitted_symbols->nr++];
758
759 memcpy(f, e, sizeof(struct emitted_diff_symbol));
760 f->line = e->line ? xmemdupz(e->line, e->len) : NULL;
761 }
762
763 struct moved_entry {
764 struct hashmap_entry ent;
765 const struct emitted_diff_symbol *es;
766 struct moved_entry *next_line;
767 struct ws_delta *wsd;
768 };
769
770 /**
771 * The struct ws_delta holds white space differences between moved lines, i.e.
772 * between '+' and '-' lines that have been detected to be a move.
773 * The string contains the difference in leading white spaces, before the
774 * rest of the line is compared using the white space config for move
775 * coloring. The current_longer indicates if the first string in the
776 * comparision is longer than the second.
777 */
778 struct ws_delta {
779 char *string;
780 unsigned int current_longer : 1;
781 };
782 #define WS_DELTA_INIT { NULL, 0 }
783
784 static int compute_ws_delta(const struct emitted_diff_symbol *a,
785 const struct emitted_diff_symbol *b,
786 struct ws_delta *out)
787 {
788 const struct emitted_diff_symbol *longer = a->len > b->len ? a : b;
789 const struct emitted_diff_symbol *shorter = a->len > b->len ? b : a;
790 int d = longer->len - shorter->len;
791
792 out->string = xmemdupz(longer->line, d);
793 out->current_longer = (a == longer);
794
795 return !strncmp(longer->line + d, shorter->line, shorter->len);
796 }
797
798 static int cmp_in_block_with_wsd(const struct diff_options *o,
799 const struct moved_entry *cur,
800 const struct moved_entry *match,
801 struct moved_entry *pmb,
802 int n)
803 {
804 struct emitted_diff_symbol *l = &o->emitted_symbols->buf[n];
805 int al = cur->es->len, cl = l->len;
806 const char *a = cur->es->line,
807 *b = match->es->line,
808 *c = l->line;
809
810 int wslen;
811
812 /*
813 * We need to check if 'cur' is equal to 'match'.
814 * As those are from the same (+/-) side, we do not need to adjust for
815 * indent changes. However these were found using fuzzy matching
816 * so we do have to check if they are equal.
817 */
818 if (strcmp(a, b))
819 return 1;
820
821 if (!pmb->wsd)
822 /*
823 * No white space delta was carried forward? This can happen
824 * when we exit early in this function and do not carry
825 * forward ws.
826 */
827 return 1;
828
829 /*
830 * The indent changes of the block are known and carried forward in
831 * pmb->wsd; however we need to check if the indent changes of the
832 * current line are still the same as before.
833 *
834 * To do so we need to compare 'l' to 'cur', adjusting the
835 * one of them for the white spaces, depending which was longer.
836 */
837
838 wslen = strlen(pmb->wsd->string);
839 if (pmb->wsd->current_longer) {
840 c += wslen;
841 cl -= wslen;
842 } else {
843 a += wslen;
844 al -= wslen;
845 }
846
847 if (strcmp(a, c))
848 return 1;
849
850 return 0;
851 }
852
853 static int moved_entry_cmp(const void *hashmap_cmp_fn_data,
854 const void *entry,
855 const void *entry_or_key,
856 const void *keydata)
857 {
858 const struct diff_options *diffopt = hashmap_cmp_fn_data;
859 const struct moved_entry *a = entry;
860 const struct moved_entry *b = entry_or_key;
861 unsigned flags = diffopt->color_moved_ws_handling
862 & XDF_WHITESPACE_FLAGS;
863
864 if (diffopt->color_moved_ws_handling &
865 COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE)
866 /*
867 * As there is not specific white space config given,
868 * we'd need to check for a new block, so ignore all
869 * white space. The setup of the white space
870 * configuration for the next block is done else where
871 */
872 flags |= XDF_IGNORE_WHITESPACE;
873
874 return !xdiff_compare_lines(a->es->line, a->es->len,
875 b->es->line, b->es->len,
876 flags);
877 }
878
879 static struct moved_entry *prepare_entry(struct diff_options *o,
880 int line_no)
881 {
882 struct moved_entry *ret = xmalloc(sizeof(*ret));
883 struct emitted_diff_symbol *l = &o->emitted_symbols->buf[line_no];
884 unsigned flags = o->color_moved_ws_handling & XDF_WHITESPACE_FLAGS;
885
886 ret->ent.hash = xdiff_hash_string(l->line, l->len, flags);
887 ret->es = l;
888 ret->next_line = NULL;
889 ret->wsd = NULL;
890
891 return ret;
892 }
893
894 static void add_lines_to_move_detection(struct diff_options *o,
895 struct hashmap *add_lines,
896 struct hashmap *del_lines)
897 {
898 struct moved_entry *prev_line = NULL;
899
900 int n;
901 for (n = 0; n < o->emitted_symbols->nr; n++) {
902 struct hashmap *hm;
903 struct moved_entry *key;
904
905 switch (o->emitted_symbols->buf[n].s) {
906 case DIFF_SYMBOL_PLUS:
907 hm = add_lines;
908 break;
909 case DIFF_SYMBOL_MINUS:
910 hm = del_lines;
911 break;
912 default:
913 prev_line = NULL;
914 continue;
915 }
916
917 key = prepare_entry(o, n);
918 if (prev_line && prev_line->es->s == o->emitted_symbols->buf[n].s)
919 prev_line->next_line = key;
920
921 hashmap_add(hm, key);
922 prev_line = key;
923 }
924 }
925
926 static void pmb_advance_or_null(struct diff_options *o,
927 struct moved_entry *match,
928 struct hashmap *hm,
929 struct moved_entry **pmb,
930 int pmb_nr)
931 {
932 int i;
933 for (i = 0; i < pmb_nr; i++) {
934 struct moved_entry *prev = pmb[i];
935 struct moved_entry *cur = (prev && prev->next_line) ?
936 prev->next_line : NULL;
937 if (cur && !hm->cmpfn(o, cur, match, NULL)) {
938 pmb[i] = cur;
939 } else {
940 pmb[i] = NULL;
941 }
942 }
943 }
944
945 static void pmb_advance_or_null_multi_match(struct diff_options *o,
946 struct moved_entry *match,
947 struct hashmap *hm,
948 struct moved_entry **pmb,
949 int pmb_nr, int n)
950 {
951 int i;
952 char *got_match = xcalloc(1, pmb_nr);
953
954 for (; match; match = hashmap_get_next(hm, match)) {
955 for (i = 0; i < pmb_nr; i++) {
956 struct moved_entry *prev = pmb[i];
957 struct moved_entry *cur = (prev && prev->next_line) ?
958 prev->next_line : NULL;
959 if (!cur)
960 continue;
961 if (!cmp_in_block_with_wsd(o, cur, match, pmb[i], n))
962 got_match[i] |= 1;
963 }
964 }
965
966 for (i = 0; i < pmb_nr; i++) {
967 if (got_match[i]) {
968 /* Carry the white space delta forward */
969 pmb[i]->next_line->wsd = pmb[i]->wsd;
970 pmb[i] = pmb[i]->next_line;
971 } else
972 pmb[i] = NULL;
973 }
974 }
975
976 static int shrink_potential_moved_blocks(struct moved_entry **pmb,
977 int pmb_nr)
978 {
979 int lp, rp;
980
981 /* Shrink the set of potential block to the remaining running */
982 for (lp = 0, rp = pmb_nr - 1; lp <= rp;) {
983 while (lp < pmb_nr && pmb[lp])
984 lp++;
985 /* lp points at the first NULL now */
986
987 while (rp > -1 && !pmb[rp])
988 rp--;
989 /* rp points at the last non-NULL */
990
991 if (lp < pmb_nr && rp > -1 && lp < rp) {
992 pmb[lp] = pmb[rp];
993 if (pmb[rp]->wsd) {
994 free(pmb[rp]->wsd->string);
995 FREE_AND_NULL(pmb[rp]->wsd);
996 }
997 pmb[rp] = NULL;
998 rp--;
999 lp++;
1000 }
1001 }
1002
1003 /* Remember the number of running sets */
1004 return rp + 1;
1005 }
1006
1007 /*
1008 * If o->color_moved is COLOR_MOVED_PLAIN, this function does nothing.
1009 *
1010 * Otherwise, if the last block has fewer alphanumeric characters than
1011 * COLOR_MOVED_MIN_ALNUM_COUNT, unset DIFF_SYMBOL_MOVED_LINE on all lines in
1012 * that block.
1013 *
1014 * The last block consists of the (n - block_length)'th line up to but not
1015 * including the nth line.
1016 *
1017 * NEEDSWORK: This uses the same heuristic as blame_entry_score() in blame.c.
1018 * Think of a way to unify them.
1019 */
1020 static void adjust_last_block(struct diff_options *o, int n, int block_length)
1021 {
1022 int i, alnum_count = 0;
1023 if (o->color_moved == COLOR_MOVED_PLAIN)
1024 return;
1025 for (i = 1; i < block_length + 1; i++) {
1026 const char *c = o->emitted_symbols->buf[n - i].line;
1027 for (; *c; c++) {
1028 if (!isalnum(*c))
1029 continue;
1030 alnum_count++;
1031 if (alnum_count >= COLOR_MOVED_MIN_ALNUM_COUNT)
1032 return;
1033 }
1034 }
1035 for (i = 1; i < block_length + 1; i++)
1036 o->emitted_symbols->buf[n - i].flags &= ~DIFF_SYMBOL_MOVED_LINE;
1037 }
1038
1039 /* Find blocks of moved code, delegate actual coloring decision to helper */
1040 static void mark_color_as_moved(struct diff_options *o,
1041 struct hashmap *add_lines,
1042 struct hashmap *del_lines)
1043 {
1044 struct moved_entry **pmb = NULL; /* potentially moved blocks */
1045 int pmb_nr = 0, pmb_alloc = 0;
1046 int n, flipped_block = 1, block_length = 0;
1047
1048
1049 for (n = 0; n < o->emitted_symbols->nr; n++) {
1050 struct hashmap *hm = NULL;
1051 struct moved_entry *key;
1052 struct moved_entry *match = NULL;
1053 struct emitted_diff_symbol *l = &o->emitted_symbols->buf[n];
1054
1055 switch (l->s) {
1056 case DIFF_SYMBOL_PLUS:
1057 hm = del_lines;
1058 key = prepare_entry(o, n);
1059 match = hashmap_get(hm, key, NULL);
1060 free(key);
1061 break;
1062 case DIFF_SYMBOL_MINUS:
1063 hm = add_lines;
1064 key = prepare_entry(o, n);
1065 match = hashmap_get(hm, key, NULL);
1066 free(key);
1067 break;
1068 default:
1069 flipped_block = 1;
1070 }
1071
1072 if (!match) {
1073 adjust_last_block(o, n, block_length);
1074 pmb_nr = 0;
1075 block_length = 0;
1076 continue;
1077 }
1078
1079 l->flags |= DIFF_SYMBOL_MOVED_LINE;
1080
1081 if (o->color_moved == COLOR_MOVED_PLAIN)
1082 continue;
1083
1084 if (o->color_moved_ws_handling &
1085 COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE)
1086 pmb_advance_or_null_multi_match(o, match, hm, pmb, pmb_nr, n);
1087 else
1088 pmb_advance_or_null(o, match, hm, pmb, pmb_nr);
1089
1090 pmb_nr = shrink_potential_moved_blocks(pmb, pmb_nr);
1091
1092 if (pmb_nr == 0) {
1093 /*
1094 * The current line is the start of a new block.
1095 * Setup the set of potential blocks.
1096 */
1097 for (; match; match = hashmap_get_next(hm, match)) {
1098 ALLOC_GROW(pmb, pmb_nr + 1, pmb_alloc);
1099 if (o->color_moved_ws_handling &
1100 COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE) {
1101 struct ws_delta *wsd = xmalloc(sizeof(*match->wsd));
1102 if (compute_ws_delta(l, match->es, wsd)) {
1103 match->wsd = wsd;
1104 pmb[pmb_nr++] = match;
1105 } else
1106 free(wsd);
1107 } else {
1108 pmb[pmb_nr++] = match;
1109 }
1110 }
1111
1112 flipped_block = (flipped_block + 1) % 2;
1113
1114 adjust_last_block(o, n, block_length);
1115 block_length = 0;
1116 }
1117
1118 block_length++;
1119
1120 if (flipped_block && o->color_moved != COLOR_MOVED_BLOCKS)
1121 l->flags |= DIFF_SYMBOL_MOVED_LINE_ALT;
1122 }
1123 adjust_last_block(o, n, block_length);
1124
1125 free(pmb);
1126 }
1127
1128 #define DIFF_SYMBOL_MOVED_LINE_ZEBRA_MASK \
1129 (DIFF_SYMBOL_MOVED_LINE | DIFF_SYMBOL_MOVED_LINE_ALT)
1130 static void dim_moved_lines(struct diff_options *o)
1131 {
1132 int n;
1133 for (n = 0; n < o->emitted_symbols->nr; n++) {
1134 struct emitted_diff_symbol *prev = (n != 0) ?
1135 &o->emitted_symbols->buf[n - 1] : NULL;
1136 struct emitted_diff_symbol *l = &o->emitted_symbols->buf[n];
1137 struct emitted_diff_symbol *next =
1138 (n < o->emitted_symbols->nr - 1) ?
1139 &o->emitted_symbols->buf[n + 1] : NULL;
1140
1141 /* Not a plus or minus line? */
1142 if (l->s != DIFF_SYMBOL_PLUS && l->s != DIFF_SYMBOL_MINUS)
1143 continue;
1144
1145 /* Not a moved line? */
1146 if (!(l->flags & DIFF_SYMBOL_MOVED_LINE))
1147 continue;
1148
1149 /*
1150 * If prev or next are not a plus or minus line,
1151 * pretend they don't exist
1152 */
1153 if (prev && prev->s != DIFF_SYMBOL_PLUS &&
1154 prev->s != DIFF_SYMBOL_MINUS)
1155 prev = NULL;
1156 if (next && next->s != DIFF_SYMBOL_PLUS &&
1157 next->s != DIFF_SYMBOL_MINUS)
1158 next = NULL;
1159
1160 /* Inside a block? */
1161 if ((prev &&
1162 (prev->flags & DIFF_SYMBOL_MOVED_LINE_ZEBRA_MASK) ==
1163 (l->flags & DIFF_SYMBOL_MOVED_LINE_ZEBRA_MASK)) &&
1164 (next &&
1165 (next->flags & DIFF_SYMBOL_MOVED_LINE_ZEBRA_MASK) ==
1166 (l->flags & DIFF_SYMBOL_MOVED_LINE_ZEBRA_MASK))) {
1167 l->flags |= DIFF_SYMBOL_MOVED_LINE_UNINTERESTING;
1168 continue;
1169 }
1170
1171 /* Check if we are at an interesting bound: */
1172 if (prev && (prev->flags & DIFF_SYMBOL_MOVED_LINE) &&
1173 (prev->flags & DIFF_SYMBOL_MOVED_LINE_ALT) !=
1174 (l->flags & DIFF_SYMBOL_MOVED_LINE_ALT))
1175 continue;
1176 if (next && (next->flags & DIFF_SYMBOL_MOVED_LINE) &&
1177 (next->flags & DIFF_SYMBOL_MOVED_LINE_ALT) !=
1178 (l->flags & DIFF_SYMBOL_MOVED_LINE_ALT))
1179 continue;
1180
1181 /*
1182 * The boundary to prev and next are not interesting,
1183 * so this line is not interesting as a whole
1184 */
1185 l->flags |= DIFF_SYMBOL_MOVED_LINE_UNINTERESTING;
1186 }
1187 }
1188
1189 static void emit_line_ws_markup(struct diff_options *o,
1190 const char *set, const char *reset,
1191 const char *line, int len,
1192 const char *set_sign, char sign,
1193 unsigned ws_rule, int blank_at_eof)
1194 {
1195 const char *ws = NULL;
1196
1197 if (o->ws_error_highlight & ws_rule) {
1198 ws = diff_get_color_opt(o, DIFF_WHITESPACE);
1199 if (!*ws)
1200 ws = NULL;
1201 }
1202
1203 if (!ws && !set_sign)
1204 emit_line_0(o, set, 0, reset, sign, line, len);
1205 else if (!ws) {
1206 /* Emit just the prefix, then the rest. */
1207 emit_line_0(o, set_sign ? set_sign : set, !!set_sign, reset,
1208 sign, "", 0);
1209 emit_line_0(o, set, 0, reset, 0, line, len);
1210 } else if (blank_at_eof)
1211 /* Blank line at EOF - paint '+' as well */
1212 emit_line_0(o, ws, 0, reset, sign, line, len);
1213 else {
1214 /* Emit just the prefix, then the rest. */
1215 emit_line_0(o, set_sign ? set_sign : set, !!set_sign, reset,
1216 sign, "", 0);
1217 ws_check_emit(line, len, ws_rule,
1218 o->file, set, reset, ws);
1219 }
1220 }
1221
1222 static void emit_diff_symbol_from_struct(struct diff_options *o,
1223 struct emitted_diff_symbol *eds)
1224 {
1225 static const char *nneof = " No newline at end of file\n";
1226 const char *context, *reset, *set, *set_sign, *meta, *fraginfo;
1227 struct strbuf sb = STRBUF_INIT;
1228
1229 enum diff_symbol s = eds->s;
1230 const char *line = eds->line;
1231 int len = eds->len;
1232 unsigned flags = eds->flags;
1233
1234 switch (s) {
1235 case DIFF_SYMBOL_NO_LF_EOF:
1236 context = diff_get_color_opt(o, DIFF_CONTEXT);
1237 reset = diff_get_color_opt(o, DIFF_RESET);
1238 putc('\n', o->file);
1239 emit_line_0(o, context, 0, reset, '\\',
1240 nneof, strlen(nneof));
1241 break;
1242 case DIFF_SYMBOL_SUBMODULE_HEADER:
1243 case DIFF_SYMBOL_SUBMODULE_ERROR:
1244 case DIFF_SYMBOL_SUBMODULE_PIPETHROUGH:
1245 case DIFF_SYMBOL_STATS_SUMMARY_INSERTS_DELETES:
1246 case DIFF_SYMBOL_SUMMARY:
1247 case DIFF_SYMBOL_STATS_LINE:
1248 case DIFF_SYMBOL_BINARY_DIFF_BODY:
1249 case DIFF_SYMBOL_CONTEXT_FRAGINFO:
1250 emit_line(o, "", "", line, len);
1251 break;
1252 case DIFF_SYMBOL_CONTEXT_INCOMPLETE:
1253 case DIFF_SYMBOL_CONTEXT_MARKER:
1254 context = diff_get_color_opt(o, DIFF_CONTEXT);
1255 reset = diff_get_color_opt(o, DIFF_RESET);
1256 emit_line(o, context, reset, line, len);
1257 break;
1258 case DIFF_SYMBOL_SEPARATOR:
1259 fprintf(o->file, "%s%c",
1260 diff_line_prefix(o),
1261 o->line_termination);
1262 break;
1263 case DIFF_SYMBOL_CONTEXT:
1264 set = diff_get_color_opt(o, DIFF_CONTEXT);
1265 reset = diff_get_color_opt(o, DIFF_RESET);
1266 set_sign = NULL;
1267 if (o->flags.dual_color_diffed_diffs) {
1268 char c = !len ? 0 : line[0];
1269
1270 if (c == '+')
1271 set = diff_get_color_opt(o, DIFF_FILE_NEW);
1272 else if (c == '@')
1273 set = diff_get_color_opt(o, DIFF_FRAGINFO);
1274 else if (c == '-')
1275 set = diff_get_color_opt(o, DIFF_FILE_OLD);
1276 }
1277 emit_line_ws_markup(o, set, reset, line, len, set_sign, ' ',
1278 flags & (DIFF_SYMBOL_CONTENT_WS_MASK), 0);
1279 break;
1280 case DIFF_SYMBOL_PLUS:
1281 switch (flags & (DIFF_SYMBOL_MOVED_LINE |
1282 DIFF_SYMBOL_MOVED_LINE_ALT |
1283 DIFF_SYMBOL_MOVED_LINE_UNINTERESTING)) {
1284 case DIFF_SYMBOL_MOVED_LINE |
1285 DIFF_SYMBOL_MOVED_LINE_ALT |
1286 DIFF_SYMBOL_MOVED_LINE_UNINTERESTING:
1287 set = diff_get_color_opt(o, DIFF_FILE_NEW_MOVED_ALT_DIM);
1288 break;
1289 case DIFF_SYMBOL_MOVED_LINE |
1290 DIFF_SYMBOL_MOVED_LINE_ALT:
1291 set = diff_get_color_opt(o, DIFF_FILE_NEW_MOVED_ALT);
1292 break;
1293 case DIFF_SYMBOL_MOVED_LINE |
1294 DIFF_SYMBOL_MOVED_LINE_UNINTERESTING:
1295 set = diff_get_color_opt(o, DIFF_FILE_NEW_MOVED_DIM);
1296 break;
1297 case DIFF_SYMBOL_MOVED_LINE:
1298 set = diff_get_color_opt(o, DIFF_FILE_NEW_MOVED);
1299 break;
1300 default:
1301 set = diff_get_color_opt(o, DIFF_FILE_NEW);
1302 }
1303 reset = diff_get_color_opt(o, DIFF_RESET);
1304 if (!o->flags.dual_color_diffed_diffs)
1305 set_sign = NULL;
1306 else {
1307 char c = !len ? 0 : line[0];
1308
1309 set_sign = set;
1310 if (c == '-')
1311 set = diff_get_color_opt(o, DIFF_FILE_OLD_BOLD);
1312 else if (c == '@')
1313 set = diff_get_color_opt(o, DIFF_FRAGINFO);
1314 else if (c == '+')
1315 set = diff_get_color_opt(o, DIFF_FILE_NEW_BOLD);
1316 else
1317 set = diff_get_color_opt(o, DIFF_CONTEXT_BOLD);
1318 flags &= ~DIFF_SYMBOL_CONTENT_WS_MASK;
1319 }
1320 emit_line_ws_markup(o, set, reset, line, len, set_sign, '+',
1321 flags & DIFF_SYMBOL_CONTENT_WS_MASK,
1322 flags & DIFF_SYMBOL_CONTENT_BLANK_LINE_EOF);
1323 break;
1324 case DIFF_SYMBOL_MINUS:
1325 switch (flags & (DIFF_SYMBOL_MOVED_LINE |
1326 DIFF_SYMBOL_MOVED_LINE_ALT |
1327 DIFF_SYMBOL_MOVED_LINE_UNINTERESTING)) {
1328 case DIFF_SYMBOL_MOVED_LINE |
1329 DIFF_SYMBOL_MOVED_LINE_ALT |
1330 DIFF_SYMBOL_MOVED_LINE_UNINTERESTING:
1331 set = diff_get_color_opt(o, DIFF_FILE_OLD_MOVED_ALT_DIM);
1332 break;
1333 case DIFF_SYMBOL_MOVED_LINE |
1334 DIFF_SYMBOL_MOVED_LINE_ALT:
1335 set = diff_get_color_opt(o, DIFF_FILE_OLD_MOVED_ALT);
1336 break;
1337 case DIFF_SYMBOL_MOVED_LINE |
1338 DIFF_SYMBOL_MOVED_LINE_UNINTERESTING:
1339 set = diff_get_color_opt(o, DIFF_FILE_OLD_MOVED_DIM);
1340 break;
1341 case DIFF_SYMBOL_MOVED_LINE:
1342 set = diff_get_color_opt(o, DIFF_FILE_OLD_MOVED);
1343 break;
1344 default:
1345 set = diff_get_color_opt(o, DIFF_FILE_OLD);
1346 }
1347 reset = diff_get_color_opt(o, DIFF_RESET);
1348 if (!o->flags.dual_color_diffed_diffs)
1349 set_sign = NULL;
1350 else {
1351 char c = !len ? 0 : line[0];
1352
1353 set_sign = set;
1354 if (c == '+')
1355 set = diff_get_color_opt(o, DIFF_FILE_NEW_DIM);
1356 else if (c == '@')
1357 set = diff_get_color_opt(o, DIFF_FRAGINFO);
1358 else if (c == '-')
1359 set = diff_get_color_opt(o, DIFF_FILE_OLD_DIM);
1360 else
1361 set = diff_get_color_opt(o, DIFF_CONTEXT_DIM);
1362 }
1363 emit_line_ws_markup(o, set, reset, line, len, set_sign, '-',
1364 flags & DIFF_SYMBOL_CONTENT_WS_MASK, 0);
1365 break;
1366 case DIFF_SYMBOL_WORDS_PORCELAIN:
1367 context = diff_get_color_opt(o, DIFF_CONTEXT);
1368 reset = diff_get_color_opt(o, DIFF_RESET);
1369 emit_line(o, context, reset, line, len);
1370 fputs("~\n", o->file);
1371 break;
1372 case DIFF_SYMBOL_WORDS:
1373 context = diff_get_color_opt(o, DIFF_CONTEXT);
1374 reset = diff_get_color_opt(o, DIFF_RESET);
1375 /*
1376 * Skip the prefix character, if any. With
1377 * diff_suppress_blank_empty, there may be
1378 * none.
1379 */
1380 if (line[0] != '\n') {
1381 line++;
1382 len--;
1383 }
1384 emit_line(o, context, reset, line, len);
1385 break;
1386 case DIFF_SYMBOL_FILEPAIR_PLUS:
1387 meta = diff_get_color_opt(o, DIFF_METAINFO);
1388 reset = diff_get_color_opt(o, DIFF_RESET);
1389 fprintf(o->file, "%s%s+++ %s%s%s\n", diff_line_prefix(o), meta,
1390 line, reset,
1391 strchr(line, ' ') ? "\t" : "");
1392 break;
1393 case DIFF_SYMBOL_FILEPAIR_MINUS:
1394 meta = diff_get_color_opt(o, DIFF_METAINFO);
1395 reset = diff_get_color_opt(o, DIFF_RESET);
1396 fprintf(o->file, "%s%s--- %s%s%s\n", diff_line_prefix(o), meta,
1397 line, reset,
1398 strchr(line, ' ') ? "\t" : "");
1399 break;
1400 case DIFF_SYMBOL_BINARY_FILES:
1401 case DIFF_SYMBOL_HEADER:
1402 fprintf(o->file, "%s", line);
1403 break;
1404 case DIFF_SYMBOL_BINARY_DIFF_HEADER:
1405 fprintf(o->file, "%sGIT binary patch\n", diff_line_prefix(o));
1406 break;
1407 case DIFF_SYMBOL_BINARY_DIFF_HEADER_DELTA:
1408 fprintf(o->file, "%sdelta %s\n", diff_line_prefix(o), line);
1409 break;
1410 case DIFF_SYMBOL_BINARY_DIFF_HEADER_LITERAL:
1411 fprintf(o->file, "%sliteral %s\n", diff_line_prefix(o), line);
1412 break;
1413 case DIFF_SYMBOL_BINARY_DIFF_FOOTER:
1414 fputs(diff_line_prefix(o), o->file);
1415 fputc('\n', o->file);
1416 break;
1417 case DIFF_SYMBOL_REWRITE_DIFF:
1418 fraginfo = diff_get_color(o->use_color, DIFF_FRAGINFO);
1419 reset = diff_get_color_opt(o, DIFF_RESET);
1420 emit_line(o, fraginfo, reset, line, len);
1421 break;
1422 case DIFF_SYMBOL_SUBMODULE_ADD:
1423 set = diff_get_color_opt(o, DIFF_FILE_NEW);
1424 reset = diff_get_color_opt(o, DIFF_RESET);
1425 emit_line(o, set, reset, line, len);
1426 break;
1427 case DIFF_SYMBOL_SUBMODULE_DEL:
1428 set = diff_get_color_opt(o, DIFF_FILE_OLD);
1429 reset = diff_get_color_opt(o, DIFF_RESET);
1430 emit_line(o, set, reset, line, len);
1431 break;
1432 case DIFF_SYMBOL_SUBMODULE_UNTRACKED:
1433 fprintf(o->file, "%sSubmodule %s contains untracked content\n",
1434 diff_line_prefix(o), line);
1435 break;
1436 case DIFF_SYMBOL_SUBMODULE_MODIFIED:
1437 fprintf(o->file, "%sSubmodule %s contains modified content\n",
1438 diff_line_prefix(o), line);
1439 break;
1440 case DIFF_SYMBOL_STATS_SUMMARY_NO_FILES:
1441 emit_line(o, "", "", " 0 files changed\n",
1442 strlen(" 0 files changed\n"));
1443 break;
1444 case DIFF_SYMBOL_STATS_SUMMARY_ABBREV:
1445 emit_line(o, "", "", " ...\n", strlen(" ...\n"));
1446 break;
1447 case DIFF_SYMBOL_WORD_DIFF:
1448 fprintf(o->file, "%.*s", len, line);
1449 break;
1450 case DIFF_SYMBOL_STAT_SEP:
1451 fputs(o->stat_sep, o->file);
1452 break;
1453 default:
1454 BUG("unknown diff symbol");
1455 }
1456 strbuf_release(&sb);
1457 }
1458
1459 static void emit_diff_symbol(struct diff_options *o, enum diff_symbol s,
1460 const char *line, int len, unsigned flags)
1461 {
1462 struct emitted_diff_symbol e = {line, len, flags, s};
1463
1464 if (o->emitted_symbols)
1465 append_emitted_diff_symbol(o, &e);
1466 else
1467 emit_diff_symbol_from_struct(o, &e);
1468 }
1469
1470 void diff_emit_submodule_del(struct diff_options *o, const char *line)
1471 {
1472 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_DEL, line, strlen(line), 0);
1473 }
1474
1475 void diff_emit_submodule_add(struct diff_options *o, const char *line)
1476 {
1477 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_ADD, line, strlen(line), 0);
1478 }
1479
1480 void diff_emit_submodule_untracked(struct diff_options *o, const char *path)
1481 {
1482 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_UNTRACKED,
1483 path, strlen(path), 0);
1484 }
1485
1486 void diff_emit_submodule_modified(struct diff_options *o, const char *path)
1487 {
1488 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_MODIFIED,
1489 path, strlen(path), 0);
1490 }
1491
1492 void diff_emit_submodule_header(struct diff_options *o, const char *header)
1493 {
1494 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_HEADER,
1495 header, strlen(header), 0);
1496 }
1497
1498 void diff_emit_submodule_error(struct diff_options *o, const char *err)
1499 {
1500 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_ERROR, err, strlen(err), 0);
1501 }
1502
1503 void diff_emit_submodule_pipethrough(struct diff_options *o,
1504 const char *line, int len)
1505 {
1506 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_PIPETHROUGH, line, len, 0);
1507 }
1508
1509 static int new_blank_line_at_eof(struct emit_callback *ecbdata, const char *line, int len)
1510 {
1511 if (!((ecbdata->ws_rule & WS_BLANK_AT_EOF) &&
1512 ecbdata->blank_at_eof_in_preimage &&
1513 ecbdata->blank_at_eof_in_postimage &&
1514 ecbdata->blank_at_eof_in_preimage <= ecbdata->lno_in_preimage &&
1515 ecbdata->blank_at_eof_in_postimage <= ecbdata->lno_in_postimage))
1516 return 0;
1517 return ws_blank_line(line, len, ecbdata->ws_rule);
1518 }
1519
1520 static void emit_add_line(const char *reset,
1521 struct emit_callback *ecbdata,
1522 const char *line, int len)
1523 {
1524 unsigned flags = WSEH_NEW | ecbdata->ws_rule;
1525 if (new_blank_line_at_eof(ecbdata, line, len))
1526 flags |= DIFF_SYMBOL_CONTENT_BLANK_LINE_EOF;
1527
1528 emit_diff_symbol(ecbdata->opt, DIFF_SYMBOL_PLUS, line, len, flags);
1529 }
1530
1531 static void emit_del_line(const char *reset,
1532 struct emit_callback *ecbdata,
1533 const char *line, int len)
1534 {
1535 unsigned flags = WSEH_OLD | ecbdata->ws_rule;
1536 emit_diff_symbol(ecbdata->opt, DIFF_SYMBOL_MINUS, line, len, flags);
1537 }
1538
1539 static void emit_context_line(const char *reset,
1540 struct emit_callback *ecbdata,
1541 const char *line, int len)
1542 {
1543 unsigned flags = WSEH_CONTEXT | ecbdata->ws_rule;
1544 emit_diff_symbol(ecbdata->opt, DIFF_SYMBOL_CONTEXT, line, len, flags);
1545 }
1546
1547 static void emit_hunk_header(struct emit_callback *ecbdata,
1548 const char *line, int len)
1549 {
1550 const char *context = diff_get_color(ecbdata->color_diff, DIFF_CONTEXT);
1551 const char *frag = diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO);
1552 const char *func = diff_get_color(ecbdata->color_diff, DIFF_FUNCINFO);
1553 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
1554 const char *reverse = ecbdata->color_diff ? GIT_COLOR_REVERSE : "";
1555 static const char atat[2] = { '@', '@' };
1556 const char *cp, *ep;
1557 struct strbuf msgbuf = STRBUF_INIT;
1558 int org_len = len;
1559 int i = 1;
1560
1561 /*
1562 * As a hunk header must begin with "@@ -<old>, +<new> @@",
1563 * it always is at least 10 bytes long.
1564 */
1565 if (len < 10 ||
1566 memcmp(line, atat, 2) ||
1567 !(ep = memmem(line + 2, len - 2, atat, 2))) {
1568 emit_diff_symbol(ecbdata->opt,
1569 DIFF_SYMBOL_CONTEXT_MARKER, line, len, 0);
1570 return;
1571 }
1572 ep += 2; /* skip over @@ */
1573
1574 /* The hunk header in fraginfo color */
1575 if (ecbdata->opt->flags.dual_color_diffed_diffs)
1576 strbuf_addstr(&msgbuf, reverse);
1577 strbuf_addstr(&msgbuf, frag);
1578 strbuf_add(&msgbuf, line, ep - line);
1579 strbuf_addstr(&msgbuf, reset);
1580
1581 /*
1582 * trailing "\r\n"
1583 */
1584 for ( ; i < 3; i++)
1585 if (line[len - i] == '\r' || line[len - i] == '\n')
1586 len--;
1587
1588 /* blank before the func header */
1589 for (cp = ep; ep - line < len; ep++)
1590 if (*ep != ' ' && *ep != '\t')
1591 break;
1592 if (ep != cp) {
1593 strbuf_addstr(&msgbuf, context);
1594 strbuf_add(&msgbuf, cp, ep - cp);
1595 strbuf_addstr(&msgbuf, reset);
1596 }
1597
1598 if (ep < line + len) {
1599 strbuf_addstr(&msgbuf, func);
1600 strbuf_add(&msgbuf, ep, line + len - ep);
1601 strbuf_addstr(&msgbuf, reset);
1602 }
1603
1604 strbuf_add(&msgbuf, line + len, org_len - len);
1605 strbuf_complete_line(&msgbuf);
1606 emit_diff_symbol(ecbdata->opt,
1607 DIFF_SYMBOL_CONTEXT_FRAGINFO, msgbuf.buf, msgbuf.len, 0);
1608 strbuf_release(&msgbuf);
1609 }
1610
1611 static struct diff_tempfile *claim_diff_tempfile(void) {
1612 int i;
1613 for (i = 0; i < ARRAY_SIZE(diff_temp); i++)
1614 if (!diff_temp[i].name)
1615 return diff_temp + i;
1616 BUG("diff is failing to clean up its tempfiles");
1617 }
1618
1619 static void remove_tempfile(void)
1620 {
1621 int i;
1622 for (i = 0; i < ARRAY_SIZE(diff_temp); i++) {
1623 if (is_tempfile_active(diff_temp[i].tempfile))
1624 delete_tempfile(&diff_temp[i].tempfile);
1625 diff_temp[i].name = NULL;
1626 }
1627 }
1628
1629 static void add_line_count(struct strbuf *out, int count)
1630 {
1631 switch (count) {
1632 case 0:
1633 strbuf_addstr(out, "0,0");
1634 break;
1635 case 1:
1636 strbuf_addstr(out, "1");
1637 break;
1638 default:
1639 strbuf_addf(out, "1,%d", count);
1640 break;
1641 }
1642 }
1643
1644 static void emit_rewrite_lines(struct emit_callback *ecb,
1645 int prefix, const char *data, int size)
1646 {
1647 const char *endp = NULL;
1648 const char *reset = diff_get_color(ecb->color_diff, DIFF_RESET);
1649
1650 while (0 < size) {
1651 int len;
1652
1653 endp = memchr(data, '\n', size);
1654 len = endp ? (endp - data + 1) : size;
1655 if (prefix != '+') {
1656 ecb->lno_in_preimage++;
1657 emit_del_line(reset, ecb, data, len);
1658 } else {
1659 ecb->lno_in_postimage++;
1660 emit_add_line(reset, ecb, data, len);
1661 }
1662 size -= len;
1663 data += len;
1664 }
1665 if (!endp)
1666 emit_diff_symbol(ecb->opt, DIFF_SYMBOL_NO_LF_EOF, NULL, 0, 0);
1667 }
1668
1669 static void emit_rewrite_diff(const char *name_a,
1670 const char *name_b,
1671 struct diff_filespec *one,
1672 struct diff_filespec *two,
1673 struct userdiff_driver *textconv_one,
1674 struct userdiff_driver *textconv_two,
1675 struct diff_options *o)
1676 {
1677 int lc_a, lc_b;
1678 static struct strbuf a_name = STRBUF_INIT, b_name = STRBUF_INIT;
1679 const char *a_prefix, *b_prefix;
1680 char *data_one, *data_two;
1681 size_t size_one, size_two;
1682 struct emit_callback ecbdata;
1683 struct strbuf out = STRBUF_INIT;
1684
1685 if (diff_mnemonic_prefix && o->flags.reverse_diff) {
1686 a_prefix = o->b_prefix;
1687 b_prefix = o->a_prefix;
1688 } else {
1689 a_prefix = o->a_prefix;
1690 b_prefix = o->b_prefix;
1691 }
1692
1693 name_a += (*name_a == '/');
1694 name_b += (*name_b == '/');
1695
1696 strbuf_reset(&a_name);
1697 strbuf_reset(&b_name);
1698 quote_two_c_style(&a_name, a_prefix, name_a, 0);
1699 quote_two_c_style(&b_name, b_prefix, name_b, 0);
1700
1701 size_one = fill_textconv(textconv_one, one, &data_one);
1702 size_two = fill_textconv(textconv_two, two, &data_two);
1703
1704 memset(&ecbdata, 0, sizeof(ecbdata));
1705 ecbdata.color_diff = want_color(o->use_color);
1706 ecbdata.ws_rule = whitespace_rule(name_b);
1707 ecbdata.opt = o;
1708 if (ecbdata.ws_rule & WS_BLANK_AT_EOF) {
1709 mmfile_t mf1, mf2;
1710 mf1.ptr = (char *)data_one;
1711 mf2.ptr = (char *)data_two;
1712 mf1.size = size_one;
1713 mf2.size = size_two;
1714 check_blank_at_eof(&mf1, &mf2, &ecbdata);
1715 }
1716 ecbdata.lno_in_preimage = 1;
1717 ecbdata.lno_in_postimage = 1;
1718
1719 lc_a = count_lines(data_one, size_one);
1720 lc_b = count_lines(data_two, size_two);
1721
1722 emit_diff_symbol(o, DIFF_SYMBOL_FILEPAIR_MINUS,
1723 a_name.buf, a_name.len, 0);
1724 emit_diff_symbol(o, DIFF_SYMBOL_FILEPAIR_PLUS,
1725 b_name.buf, b_name.len, 0);
1726
1727 strbuf_addstr(&out, "@@ -");
1728 if (!o->irreversible_delete)
1729 add_line_count(&out, lc_a);
1730 else
1731 strbuf_addstr(&out, "?,?");
1732 strbuf_addstr(&out, " +");
1733 add_line_count(&out, lc_b);
1734 strbuf_addstr(&out, " @@\n");
1735 emit_diff_symbol(o, DIFF_SYMBOL_REWRITE_DIFF, out.buf, out.len, 0);
1736 strbuf_release(&out);
1737
1738 if (lc_a && !o->irreversible_delete)
1739 emit_rewrite_lines(&ecbdata, '-', data_one, size_one);
1740 if (lc_b)
1741 emit_rewrite_lines(&ecbdata, '+', data_two, size_two);
1742 if (textconv_one)
1743 free((char *)data_one);
1744 if (textconv_two)
1745 free((char *)data_two);
1746 }
1747
1748 struct diff_words_buffer {
1749 mmfile_t text;
1750 unsigned long alloc;
1751 struct diff_words_orig {
1752 const char *begin, *end;
1753 } *orig;
1754 int orig_nr, orig_alloc;
1755 };
1756
1757 static void diff_words_append(char *line, unsigned long len,
1758 struct diff_words_buffer *buffer)
1759 {
1760 ALLOC_GROW(buffer->text.ptr, buffer->text.size + len, buffer->alloc);
1761 line++;
1762 len--;
1763 memcpy(buffer->text.ptr + buffer->text.size, line, len);
1764 buffer->text.size += len;
1765 buffer->text.ptr[buffer->text.size] = '\0';
1766 }
1767
1768 struct diff_words_style_elem {
1769 const char *prefix;
1770 const char *suffix;
1771 const char *color; /* NULL; filled in by the setup code if
1772 * color is enabled */
1773 };
1774
1775 struct diff_words_style {
1776 enum diff_words_type type;
1777 struct diff_words_style_elem new_word, old_word, ctx;
1778 const char *newline;
1779 };
1780
1781 static struct diff_words_style diff_words_styles[] = {
1782 { DIFF_WORDS_PORCELAIN, {"+", "\n"}, {"-", "\n"}, {" ", "\n"}, "~\n" },
1783 { DIFF_WORDS_PLAIN, {"{+", "+}"}, {"[-", "-]"}, {"", ""}, "\n" },
1784 { DIFF_WORDS_COLOR, {"", ""}, {"", ""}, {"", ""}, "\n" }
1785 };
1786
1787 struct diff_words_data {
1788 struct diff_words_buffer minus, plus;
1789 const char *current_plus;
1790 int last_minus;
1791 struct diff_options *opt;
1792 regex_t *word_regex;
1793 enum diff_words_type type;
1794 struct diff_words_style *style;
1795 };
1796
1797 static int fn_out_diff_words_write_helper(struct diff_options *o,
1798 struct diff_words_style_elem *st_el,
1799 const char *newline,
1800 size_t count, const char *buf)
1801 {
1802 int print = 0;
1803 struct strbuf sb = STRBUF_INIT;
1804
1805 while (count) {
1806 char *p = memchr(buf, '\n', count);
1807 if (print)
1808 strbuf_addstr(&sb, diff_line_prefix(o));
1809
1810 if (p != buf) {
1811 const char *reset = st_el->color && *st_el->color ?
1812 GIT_COLOR_RESET : NULL;
1813 if (st_el->color && *st_el->color)
1814 strbuf_addstr(&sb, st_el->color);
1815 strbuf_addstr(&sb, st_el->prefix);
1816 strbuf_add(&sb, buf, p ? p - buf : count);
1817 strbuf_addstr(&sb, st_el->suffix);
1818 if (reset)
1819 strbuf_addstr(&sb, reset);
1820 }
1821 if (!p)
1822 goto out;
1823
1824 strbuf_addstr(&sb, newline);
1825 count -= p + 1 - buf;
1826 buf = p + 1;
1827 print = 1;
1828 if (count) {
1829 emit_diff_symbol(o, DIFF_SYMBOL_WORD_DIFF,
1830 sb.buf, sb.len, 0);
1831 strbuf_reset(&sb);
1832 }
1833 }
1834
1835 out:
1836 if (sb.len)
1837 emit_diff_symbol(o, DIFF_SYMBOL_WORD_DIFF,
1838 sb.buf, sb.len, 0);
1839 strbuf_release(&sb);
1840 return 0;
1841 }
1842
1843 /*
1844 * '--color-words' algorithm can be described as:
1845 *
1846 * 1. collect the minus/plus lines of a diff hunk, divided into
1847 * minus-lines and plus-lines;
1848 *
1849 * 2. break both minus-lines and plus-lines into words and
1850 * place them into two mmfile_t with one word for each line;
1851 *
1852 * 3. use xdiff to run diff on the two mmfile_t to get the words level diff;
1853 *
1854 * And for the common parts of the both file, we output the plus side text.
1855 * diff_words->current_plus is used to trace the current position of the plus file
1856 * which printed. diff_words->last_minus is used to trace the last minus word
1857 * printed.
1858 *
1859 * For '--graph' to work with '--color-words', we need to output the graph prefix
1860 * on each line of color words output. Generally, there are two conditions on
1861 * which we should output the prefix.
1862 *
1863 * 1. diff_words->last_minus == 0 &&
1864 * diff_words->current_plus == diff_words->plus.text.ptr
1865 *
1866 * that is: the plus text must start as a new line, and if there is no minus
1867 * word printed, a graph prefix must be printed.
1868 *
1869 * 2. diff_words->current_plus > diff_words->plus.text.ptr &&
1870 * *(diff_words->current_plus - 1) == '\n'
1871 *
1872 * that is: a graph prefix must be printed following a '\n'
1873 */
1874 static int color_words_output_graph_prefix(struct diff_words_data *diff_words)
1875 {
1876 if ((diff_words->last_minus == 0 &&
1877 diff_words->current_plus == diff_words->plus.text.ptr) ||
1878 (diff_words->current_plus > diff_words->plus.text.ptr &&
1879 *(diff_words->current_plus - 1) == '\n')) {
1880 return 1;
1881 } else {
1882 return 0;
1883 }
1884 }
1885
1886 static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
1887 {
1888 struct diff_words_data *diff_words = priv;
1889 struct diff_words_style *style = diff_words->style;
1890 int minus_first, minus_len, plus_first, plus_len;
1891 const char *minus_begin, *minus_end, *plus_begin, *plus_end;
1892 struct diff_options *opt = diff_words->opt;
1893 const char *line_prefix;
1894
1895 if (line[0] != '@' || parse_hunk_header(line, len,
1896 &minus_first, &minus_len, &plus_first, &plus_len))
1897 return;
1898
1899 assert(opt);
1900 line_prefix = diff_line_prefix(opt);
1901
1902 /* POSIX requires that first be decremented by one if len == 0... */
1903 if (minus_len) {
1904 minus_begin = diff_words->minus.orig[minus_first].begin;
1905 minus_end =
1906 diff_words->minus.orig[minus_first + minus_len - 1].end;
1907 } else
1908 minus_begin = minus_end =
1909 diff_words->minus.orig[minus_first].end;
1910
1911 if (plus_len) {
1912 plus_begin = diff_words->plus.orig[plus_first].begin;
1913 plus_end = diff_words->plus.orig[plus_first + plus_len - 1].end;
1914 } else
1915 plus_begin = plus_end = diff_words->plus.orig[plus_first].end;
1916
1917 if (color_words_output_graph_prefix(diff_words)) {
1918 fputs(line_prefix, diff_words->opt->file);
1919 }
1920 if (diff_words->current_plus != plus_begin) {
1921 fn_out_diff_words_write_helper(diff_words->opt,
1922 &style->ctx, style->newline,
1923 plus_begin - diff_words->current_plus,
1924 diff_words->current_plus);
1925 }
1926 if (minus_begin != minus_end) {
1927 fn_out_diff_words_write_helper(diff_words->opt,
1928 &style->old_word, style->newline,
1929 minus_end - minus_begin, minus_begin);
1930 }
1931 if (plus_begin != plus_end) {
1932 fn_out_diff_words_write_helper(diff_words->opt,
1933 &style->new_word, style->newline,
1934 plus_end - plus_begin, plus_begin);
1935 }
1936
1937 diff_words->current_plus = plus_end;
1938 diff_words->last_minus = minus_first;
1939 }
1940
1941 /* This function starts looking at *begin, and returns 0 iff a word was found. */
1942 static int find_word_boundaries(mmfile_t *buffer, regex_t *word_regex,
1943 int *begin, int *end)
1944 {
1945 if (word_regex && *begin < buffer->size) {
1946 regmatch_t match[1];
1947 if (!regexec_buf(word_regex, buffer->ptr + *begin,
1948 buffer->size - *begin, 1, match, 0)) {
1949 char *p = memchr(buffer->ptr + *begin + match[0].rm_so,
1950 '\n', match[0].rm_eo - match[0].rm_so);
1951 *end = p ? p - buffer->ptr : match[0].rm_eo + *begin;
1952 *begin += match[0].rm_so;
1953 return *begin >= *end;
1954 }
1955 return -1;
1956 }
1957
1958 /* find the next word */
1959 while (*begin < buffer->size && isspace(buffer->ptr[*begin]))
1960 (*begin)++;
1961 if (*begin >= buffer->size)
1962 return -1;
1963
1964 /* find the end of the word */
1965 *end = *begin + 1;
1966 while (*end < buffer->size && !isspace(buffer->ptr[*end]))
1967 (*end)++;
1968
1969 return 0;
1970 }
1971
1972 /*
1973 * This function splits the words in buffer->text, stores the list with
1974 * newline separator into out, and saves the offsets of the original words
1975 * in buffer->orig.
1976 */
1977 static void diff_words_fill(struct diff_words_buffer *buffer, mmfile_t *out,
1978 regex_t *word_regex)
1979 {
1980 int i, j;
1981 long alloc = 0;
1982
1983 out->size = 0;
1984 out->ptr = NULL;
1985
1986 /* fake an empty "0th" word */
1987 ALLOC_GROW(buffer->orig, 1, buffer->orig_alloc);
1988 buffer->orig[0].begin = buffer->orig[0].end = buffer->text.ptr;
1989 buffer->orig_nr = 1;
1990
1991 for (i = 0; i < buffer->text.size; i++) {
1992 if (find_word_boundaries(&buffer->text, word_regex, &i, &j))
1993 return;
1994
1995 /* store original boundaries */
1996 ALLOC_GROW(buffer->orig, buffer->orig_nr + 1,
1997 buffer->orig_alloc);
1998 buffer->orig[buffer->orig_nr].begin = buffer->text.ptr + i;
1999 buffer->orig[buffer->orig_nr].end = buffer->text.ptr + j;
2000 buffer->orig_nr++;
2001
2002 /* store one word */
2003 ALLOC_GROW(out->ptr, out->size + j - i + 1, alloc);
2004 memcpy(out->ptr + out->size, buffer->text.ptr + i, j - i);
2005 out->ptr[out->size + j - i] = '\n';
2006 out->size += j - i + 1;
2007
2008 i = j - 1;
2009 }
2010 }
2011
2012 /* this executes the word diff on the accumulated buffers */
2013 static void diff_words_show(struct diff_words_data *diff_words)
2014 {
2015 xpparam_t xpp;
2016 xdemitconf_t xecfg;
2017 mmfile_t minus, plus;
2018 struct diff_words_style *style = diff_words->style;
2019
2020 struct diff_options *opt = diff_words->opt;
2021 const char *line_prefix;
2022
2023 assert(opt);
2024 line_prefix = diff_line_prefix(opt);
2025
2026 /* special case: only removal */
2027 if (!diff_words->plus.text.size) {
2028 emit_diff_symbol(diff_words->opt, DIFF_SYMBOL_WORD_DIFF,
2029 line_prefix, strlen(line_prefix), 0);
2030 fn_out_diff_words_write_helper(diff_words->opt,
2031 &style->old_word, style->newline,
2032 diff_words->minus.text.size,
2033 diff_words->minus.text.ptr);
2034 diff_words->minus.text.size = 0;
2035 return;
2036 }
2037
2038 diff_words->current_plus = diff_words->plus.text.ptr;
2039 diff_words->last_minus = 0;
2040
2041 memset(&xpp, 0, sizeof(xpp));
2042 memset(&xecfg, 0, sizeof(xecfg));
2043 diff_words_fill(&diff_words->minus, &minus, diff_words->word_regex);
2044 diff_words_fill(&diff_words->plus, &plus, diff_words->word_regex);
2045 xpp.flags = 0;
2046 /* as only the hunk header will be parsed, we need a 0-context */
2047 xecfg.ctxlen = 0;
2048 if (xdi_diff_outf(&minus, &plus, fn_out_diff_words_aux, diff_words,
2049 &xpp, &xecfg))
2050 die("unable to generate word diff");
2051 free(minus.ptr);
2052 free(plus.ptr);
2053 if (diff_words->current_plus != diff_words->plus.text.ptr +
2054 diff_words->plus.text.size) {
2055 if (color_words_output_graph_prefix(diff_words))
2056 emit_diff_symbol(diff_words->opt, DIFF_SYMBOL_WORD_DIFF,
2057 line_prefix, strlen(line_prefix), 0);
2058 fn_out_diff_words_write_helper(diff_words->opt,
2059 &style->ctx, style->newline,
2060 diff_words->plus.text.ptr + diff_words->plus.text.size
2061 - diff_words->current_plus, diff_words->current_plus);
2062 }
2063 diff_words->minus.text.size = diff_words->plus.text.size = 0;
2064 }
2065
2066 /* In "color-words" mode, show word-diff of words accumulated in the buffer */
2067 static void diff_words_flush(struct emit_callback *ecbdata)
2068 {
2069 struct diff_options *wo = ecbdata->diff_words->opt;
2070
2071 if (ecbdata->diff_words->minus.text.size ||
2072 ecbdata->diff_words->plus.text.size)
2073 diff_words_show(ecbdata->diff_words);
2074
2075 if (wo->emitted_symbols) {
2076 struct diff_options *o = ecbdata->opt;
2077 struct emitted_diff_symbols *wol = wo->emitted_symbols;
2078 int i;
2079
2080 /*
2081 * NEEDSWORK:
2082 * Instead of appending each, concat all words to a line?
2083 */
2084 for (i = 0; i < wol->nr; i++)
2085 append_emitted_diff_symbol(o, &wol->buf[i]);
2086
2087 for (i = 0; i < wol->nr; i++)
2088 free((void *)wol->buf[i].line);
2089
2090 wol->nr = 0;
2091 }
2092 }
2093
2094 static void diff_filespec_load_driver(struct diff_filespec *one)
2095 {
2096 /* Use already-loaded driver */
2097 if (one->driver)
2098 return;
2099
2100 if (S_ISREG(one->mode))
2101 one->driver = userdiff_find_by_path(one->path);
2102
2103 /* Fallback to default settings */
2104 if (!one->driver)
2105 one->driver = userdiff_find_by_name("default");
2106 }
2107
2108 static const char *userdiff_word_regex(struct diff_filespec *one)
2109 {
2110 diff_filespec_load_driver(one);
2111 return one->driver->word_regex;
2112 }
2113
2114 static void init_diff_words_data(struct emit_callback *ecbdata,
2115 struct diff_options *orig_opts,
2116 struct diff_filespec *one,
2117 struct diff_filespec *two)
2118 {
2119 int i;
2120 struct diff_options *o = xmalloc(sizeof(struct diff_options));
2121 memcpy(o, orig_opts, sizeof(struct diff_options));
2122
2123 ecbdata->diff_words =
2124 xcalloc(1, sizeof(struct diff_words_data));
2125 ecbdata->diff_words->type = o->word_diff;
2126 ecbdata->diff_words->opt = o;
2127
2128 if (orig_opts->emitted_symbols)
2129 o->emitted_symbols =
2130 xcalloc(1, sizeof(struct emitted_diff_symbols));
2131
2132 if (!o->word_regex)
2133 o->word_regex = userdiff_word_regex(one);
2134 if (!o->word_regex)
2135 o->word_regex = userdiff_word_regex(two);
2136 if (!o->word_regex)
2137 o->word_regex = diff_word_regex_cfg;
2138 if (o->word_regex) {
2139 ecbdata->diff_words->word_regex = (regex_t *)
2140 xmalloc(sizeof(regex_t));
2141 if (regcomp(ecbdata->diff_words->word_regex,
2142 o->word_regex,
2143 REG_EXTENDED | REG_NEWLINE))
2144 die("invalid regular expression: %s",
2145 o->word_regex);
2146 }
2147 for (i = 0; i < ARRAY_SIZE(diff_words_styles); i++) {
2148 if (o->word_diff == diff_words_styles[i].type) {
2149 ecbdata->diff_words->style =
2150 &diff_words_styles[i];
2151 break;
2152 }
2153 }
2154 if (want_color(o->use_color)) {
2155 struct diff_words_style *st = ecbdata->diff_words->style;
2156 st->old_word.color = diff_get_color_opt(o, DIFF_FILE_OLD);
2157 st->new_word.color = diff_get_color_opt(o, DIFF_FILE_NEW);
2158 st->ctx.color = diff_get_color_opt(o, DIFF_CONTEXT);
2159 }
2160 }
2161
2162 static void free_diff_words_data(struct emit_callback *ecbdata)
2163 {
2164 if (ecbdata->diff_words) {
2165 diff_words_flush(ecbdata);
2166 free (ecbdata->diff_words->opt->emitted_symbols);
2167 free (ecbdata->diff_words->opt);
2168 free (ecbdata->diff_words->minus.text.ptr);
2169 free (ecbdata->diff_words->minus.orig);
2170 free (ecbdata->diff_words->plus.text.ptr);
2171 free (ecbdata->diff_words->plus.orig);
2172 if (ecbdata->diff_words->word_regex) {
2173 regfree(ecbdata->diff_words->word_regex);
2174 free(ecbdata->diff_words->word_regex);
2175 }
2176 FREE_AND_NULL(ecbdata->diff_words);
2177 }
2178 }
2179
2180 const char *diff_get_color(int diff_use_color, enum color_diff ix)
2181 {
2182 if (want_color(diff_use_color))
2183 return diff_colors[ix];
2184 return "";
2185 }
2186
2187 const char *diff_line_prefix(struct diff_options *opt)
2188 {
2189 struct strbuf *msgbuf;
2190 if (!opt->output_prefix)
2191 return "";
2192
2193 msgbuf = opt->output_prefix(opt, opt->output_prefix_data);
2194 return msgbuf->buf;
2195 }
2196
2197 static unsigned long sane_truncate_line(struct emit_callback *ecb, char *line, unsigned long len)
2198 {
2199 const char *cp;
2200 unsigned long allot;
2201 size_t l = len;
2202
2203 cp = line;
2204 allot = l;
2205 while (0 < l) {
2206 (void) utf8_width(&cp, &l);
2207 if (!cp)
2208 break; /* truncated in the middle? */
2209 }
2210 return allot - l;
2211 }
2212
2213 static void find_lno(const char *line, struct emit_callback *ecbdata)
2214 {
2215 const char *p;
2216 ecbdata->lno_in_preimage = 0;
2217 ecbdata->lno_in_postimage = 0;
2218 p = strchr(line, '-');
2219 if (!p)
2220 return; /* cannot happen */
2221 ecbdata->lno_in_preimage = strtol(p + 1, NULL, 10);
2222 p = strchr(p, '+');
2223 if (!p)
2224 return; /* cannot happen */
2225 ecbdata->lno_in_postimage = strtol(p + 1, NULL, 10);
2226 }
2227
2228 static void fn_out_consume(void *priv, char *line, unsigned long len)
2229 {
2230 struct emit_callback *ecbdata = priv;
2231 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
2232 struct diff_options *o = ecbdata->opt;
2233
2234 o->found_changes = 1;
2235
2236 if (ecbdata->header) {
2237 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
2238 ecbdata->header->buf, ecbdata->header->len, 0);
2239 strbuf_reset(ecbdata->header);
2240 ecbdata->header = NULL;
2241 }
2242
2243 if (ecbdata->label_path[0]) {
2244 emit_diff_symbol(o, DIFF_SYMBOL_FILEPAIR_MINUS,
2245 ecbdata->label_path[0],
2246 strlen(ecbdata->label_path[0]), 0);
2247 emit_diff_symbol(o, DIFF_SYMBOL_FILEPAIR_PLUS,
2248 ecbdata->label_path[1],
2249 strlen(ecbdata->label_path[1]), 0);
2250 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
2251 }
2252
2253 if (diff_suppress_blank_empty
2254 && len == 2 && line[0] == ' ' && line[1] == '\n') {
2255 line[0] = '\n';
2256 len = 1;
2257 }
2258
2259 if (line[0] == '@') {
2260 if (ecbdata->diff_words)
2261 diff_words_flush(ecbdata);
2262 len = sane_truncate_line(ecbdata, line, len);
2263 find_lno(line, ecbdata);
2264 emit_hunk_header(ecbdata, line, len);
2265 return;
2266 }
2267
2268 if (ecbdata->diff_words) {
2269 enum diff_symbol s =
2270 ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN ?
2271 DIFF_SYMBOL_WORDS_PORCELAIN : DIFF_SYMBOL_WORDS;
2272 if (line[0] == '-') {
2273 diff_words_append(line, len,
2274 &ecbdata->diff_words->minus);
2275 return;
2276 } else if (line[0] == '+') {
2277 diff_words_append(line, len,
2278 &ecbdata->diff_words->plus);
2279 return;
2280 } else if (starts_with(line, "\\ ")) {
2281 /*
2282 * Eat the "no newline at eof" marker as if we
2283 * saw a "+" or "-" line with nothing on it,
2284 * and return without diff_words_flush() to
2285 * defer processing. If this is the end of
2286 * preimage, more "+" lines may come after it.
2287 */
2288 return;
2289 }
2290 diff_words_flush(ecbdata);
2291 emit_diff_symbol(o, s, line, len, 0);
2292 return;
2293 }
2294
2295 switch (line[0]) {
2296 case '+':
2297 ecbdata->lno_in_postimage++;
2298 emit_add_line(reset, ecbdata, line + 1, len - 1);
2299 break;
2300 case '-':
2301 ecbdata->lno_in_preimage++;
2302 emit_del_line(reset, ecbdata, line + 1, len - 1);
2303 break;
2304 case ' ':
2305 ecbdata->lno_in_postimage++;
2306 ecbdata->lno_in_preimage++;
2307 emit_context_line(reset, ecbdata, line + 1, len - 1);
2308 break;
2309 default:
2310 /* incomplete line at the end */
2311 ecbdata->lno_in_preimage++;
2312 emit_diff_symbol(o, DIFF_SYMBOL_CONTEXT_INCOMPLETE,
2313 line, len, 0);
2314 break;
2315 }
2316 }
2317
2318 static void pprint_rename(struct strbuf *name, const char *a, const char *b)
2319 {
2320 const char *old_name = a;
2321 const char *new_name = b;
2322 int pfx_length, sfx_length;
2323 int pfx_adjust_for_slash;
2324 int len_a = strlen(a);
2325 int len_b = strlen(b);
2326 int a_midlen, b_midlen;
2327 int qlen_a = quote_c_style(a, NULL, NULL, 0);
2328 int qlen_b = quote_c_style(b, NULL, NULL, 0);
2329
2330 if (qlen_a || qlen_b) {
2331 quote_c_style(a, name, NULL, 0);
2332 strbuf_addstr(name, " => ");
2333 quote_c_style(b, name, NULL, 0);
2334 return;
2335 }
2336
2337 /* Find common prefix */
2338 pfx_length = 0;
2339 while (*old_name && *new_name && *old_name == *new_name) {
2340 if (*old_name == '/')
2341 pfx_length = old_name - a + 1;
2342 old_name++;
2343 new_name++;
2344 }
2345
2346 /* Find common suffix */
2347 old_name = a + len_a;
2348 new_name = b + len_b;
2349 sfx_length = 0;
2350 /*
2351 * If there is a common prefix, it must end in a slash. In
2352 * that case we let this loop run 1 into the prefix to see the
2353 * same slash.
2354 *
2355 * If there is no common prefix, we cannot do this as it would
2356 * underrun the input strings.
2357 */
2358 pfx_adjust_for_slash = (pfx_length ? 1 : 0);
2359 while (a + pfx_length - pfx_adjust_for_slash <= old_name &&
2360 b + pfx_length - pfx_adjust_for_slash <= new_name &&
2361 *old_name == *new_name) {
2362 if (*old_name == '/')
2363 sfx_length = len_a - (old_name - a);
2364 old_name--;
2365 new_name--;
2366 }
2367
2368 /*
2369 * pfx{mid-a => mid-b}sfx
2370 * {pfx-a => pfx-b}sfx
2371 * pfx{sfx-a => sfx-b}
2372 * name-a => name-b
2373 */
2374 a_midlen = len_a - pfx_length - sfx_length;
2375 b_midlen = len_b - pfx_length - sfx_length;
2376 if (a_midlen < 0)
2377 a_midlen = 0;
2378 if (b_midlen < 0)
2379 b_midlen = 0;
2380
2381 strbuf_grow(name, pfx_length + a_midlen + b_midlen + sfx_length + 7);
2382 if (pfx_length + sfx_length) {
2383 strbuf_add(name, a, pfx_length);
2384 strbuf_addch(name, '{');
2385 }
2386 strbuf_add(name, a + pfx_length, a_midlen);
2387 strbuf_addstr(name, " => ");
2388 strbuf_add(name, b + pfx_length, b_midlen);
2389 if (pfx_length + sfx_length) {
2390 strbuf_addch(name, '}');
2391 strbuf_add(name, a + len_a - sfx_length, sfx_length);
2392 }
2393 }
2394
2395 struct diffstat_t {
2396 int nr;
2397 int alloc;
2398 struct diffstat_file {
2399 char *from_name;
2400 char *name;
2401 char *print_name;
2402 const char *comments;
2403 unsigned is_unmerged:1;
2404 unsigned is_binary:1;
2405 unsigned is_renamed:1;
2406 unsigned is_interesting:1;
2407 uintmax_t added, deleted;
2408 } **files;
2409 };
2410
2411 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
2412 const char *name_a,
2413 const char *name_b)
2414 {
2415 struct diffstat_file *x;
2416 x = xcalloc(1, sizeof(*x));
2417 ALLOC_GROW(diffstat->files, diffstat->nr + 1, diffstat->alloc);
2418 diffstat->files[diffstat->nr++] = x;
2419 if (name_b) {
2420 x->from_name = xstrdup(name_a);
2421 x->name = xstrdup(name_b);
2422 x->is_renamed = 1;
2423 }
2424 else {
2425 x->from_name = NULL;
2426 x->name = xstrdup(name_a);
2427 }
2428 return x;
2429 }
2430
2431 static void diffstat_consume(void *priv, char *line, unsigned long len)
2432 {
2433 struct diffstat_t *diffstat = priv;
2434 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
2435
2436 if (line[0] == '+')
2437 x->added++;
2438 else if (line[0] == '-')
2439 x->deleted++;
2440 }
2441
2442 const char mime_boundary_leader[] = "------------";
2443
2444 static int scale_linear(int it, int width, int max_change)
2445 {
2446 if (!it)
2447 return 0;
2448 /*
2449 * make sure that at least one '-' or '+' is printed if
2450 * there is any change to this path. The easiest way is to
2451 * scale linearly as if the alloted width is one column shorter
2452 * than it is, and then add 1 to the result.
2453 */
2454 return 1 + (it * (width - 1) / max_change);
2455 }
2456
2457 static void show_graph(struct strbuf *out, char ch, int cnt,
2458 const char *set, const char *reset)
2459 {
2460 if (cnt <= 0)
2461 return;
2462 strbuf_addstr(out, set);
2463 strbuf_addchars(out, ch, cnt);
2464 strbuf_addstr(out, reset);
2465 }
2466
2467 static void fill_print_name(struct diffstat_file *file)
2468 {
2469 struct strbuf pname = STRBUF_INIT;
2470
2471 if (file->print_name)
2472 return;
2473
2474 if (file->is_renamed)
2475 pprint_rename(&pname, file->from_name, file->name);
2476 else
2477 quote_c_style(file->name, &pname, NULL, 0);
2478
2479 if (file->comments)
2480 strbuf_addf(&pname, " (%s)", file->comments);
2481
2482 file->print_name = strbuf_detach(&pname, NULL);
2483 }
2484
2485 static void print_stat_summary_inserts_deletes(struct diff_options *options,
2486 int files, int insertions, int deletions)
2487 {
2488 struct strbuf sb = STRBUF_INIT;
2489
2490 if (!files) {
2491 assert(insertions == 0 && deletions == 0);
2492 emit_diff_symbol(options, DIFF_SYMBOL_STATS_SUMMARY_NO_FILES,
2493 NULL, 0, 0);
2494 return;
2495 }
2496
2497 strbuf_addf(&sb,
2498 (files == 1) ? " %d file changed" : " %d files changed",
2499 files);
2500
2501 /*
2502 * For binary diff, the caller may want to print "x files
2503 * changed" with insertions == 0 && deletions == 0.
2504 *
2505 * Not omitting "0 insertions(+), 0 deletions(-)" in this case
2506 * is probably less confusing (i.e skip over "2 files changed
2507 * but nothing about added/removed lines? Is this a bug in Git?").
2508 */
2509 if (insertions || deletions == 0) {
2510 strbuf_addf(&sb,
2511 (insertions == 1) ? ", %d insertion(+)" : ", %d insertions(+)",
2512 insertions);
2513 }
2514
2515 if (deletions || insertions == 0) {
2516 strbuf_addf(&sb,
2517 (deletions == 1) ? ", %d deletion(-)" : ", %d deletions(-)",
2518 deletions);
2519 }
2520 strbuf_addch(&sb, '\n');
2521 emit_diff_symbol(options, DIFF_SYMBOL_STATS_SUMMARY_INSERTS_DELETES,
2522 sb.buf, sb.len, 0);
2523 strbuf_release(&sb);
2524 }
2525
2526 void print_stat_summary(FILE *fp, int files,
2527 int insertions, int deletions)
2528 {
2529 struct diff_options o;
2530 memset(&o, 0, sizeof(o));
2531 o.file = fp;
2532
2533 print_stat_summary_inserts_deletes(&o, files, insertions, deletions);
2534 }
2535
2536 static void show_stats(struct diffstat_t *data, struct diff_options *options)
2537 {
2538 int i, len, add, del, adds = 0, dels = 0;
2539 uintmax_t max_change = 0, max_len = 0;
2540 int total_files = data->nr, count;
2541 int width, name_width, graph_width, number_width = 0, bin_width = 0;
2542 const char *reset, *add_c, *del_c;
2543 int extra_shown = 0;
2544 const char *line_prefix = diff_line_prefix(options);
2545 struct strbuf out = STRBUF_INIT;
2546
2547 if (data->nr == 0)
2548 return;
2549
2550 count = options->stat_count ? options->stat_count : data->nr;
2551
2552 reset = diff_get_color_opt(options, DIFF_RESET);
2553 add_c = diff_get_color_opt(options, DIFF_FILE_NEW);
2554 del_c = diff_get_color_opt(options, DIFF_FILE_OLD);
2555
2556 /*
2557 * Find the longest filename and max number of changes
2558 */
2559 for (i = 0; (i < count) && (i < data->nr); i++) {
2560 struct diffstat_file *file = data->files[i];
2561 uintmax_t change = file->added + file->deleted;
2562
2563 if (!file->is_interesting && (change == 0)) {
2564 count++; /* not shown == room for one more */
2565 continue;
2566 }
2567 fill_print_name(file);
2568 len = strlen(file->print_name);
2569 if (max_len < len)
2570 max_len = len;
2571
2572 if (file->is_unmerged) {
2573 /* "Unmerged" is 8 characters */
2574 bin_width = bin_width < 8 ? 8 : bin_width;
2575 continue;
2576 }
2577 if (file->is_binary) {
2578 /* "Bin XXX -> YYY bytes" */
2579 int w = 14 + decimal_width(file->added)
2580 + decimal_width(file->deleted);
2581 bin_width = bin_width < w ? w : bin_width;
2582 /* Display change counts aligned with "Bin" */
2583 number_width = 3;
2584 continue;
2585 }
2586
2587 if (max_change < change)
2588 max_change = change;
2589 }
2590 count = i; /* where we can stop scanning in data->files[] */
2591
2592 /*
2593 * We have width = stat_width or term_columns() columns total.
2594 * We want a maximum of min(max_len, stat_name_width) for the name part.
2595 * We want a maximum of min(max_change, stat_graph_width) for the +- part.
2596 * We also need 1 for " " and 4 + decimal_width(max_change)
2597 * for " | NNNN " and one the empty column at the end, altogether
2598 * 6 + decimal_width(max_change).
2599 *
2600 * If there's not enough space, we will use the smaller of
2601 * stat_name_width (if set) and 5/8*width for the filename,
2602 * and the rest for constant elements + graph part, but no more
2603 * than stat_graph_width for the graph part.
2604 * (5/8 gives 50 for filename and 30 for the constant parts + graph
2605 * for the standard terminal size).
2606 *
2607 * In other words: stat_width limits the maximum width, and
2608 * stat_name_width fixes the maximum width of the filename,
2609 * and is also used to divide available columns if there
2610 * aren't enough.
2611 *
2612 * Binary files are displayed with "Bin XXX -> YYY bytes"
2613 * instead of the change count and graph. This part is treated
2614 * similarly to the graph part, except that it is not
2615 * "scaled". If total width is too small to accommodate the
2616 * guaranteed minimum width of the filename part and the
2617 * separators and this message, this message will "overflow"
2618 * making the line longer than the maximum width.
2619 */
2620
2621 if (options->stat_width == -1)
2622 width = term_columns() - strlen(line_prefix);
2623 else
2624 width = options->stat_width ? options->stat_width : 80;
2625 number_width = decimal_width(max_change) > number_width ?
2626 decimal_width(max_change) : number_width;
2627
2628 if (options->stat_graph_width == -1)
2629 options->stat_graph_width = diff_stat_graph_width;
2630
2631 /*
2632 * Guarantee 3/8*16==6 for the graph part
2633 * and 5/8*16==10 for the filename part
2634 */
2635 if (width < 16 + 6 + number_width)
2636 width = 16 + 6 + number_width;
2637
2638 /*
2639 * First assign sizes that are wanted, ignoring available width.
2640 * strlen("Bin XXX -> YYY bytes") == bin_width, and the part
2641 * starting from "XXX" should fit in graph_width.
2642 */
2643 graph_width = max_change + 4 > bin_width ? max_change : bin_width - 4;
2644 if (options->stat_graph_width &&
2645 options->stat_graph_width < graph_width)
2646 graph_width = options->stat_graph_width;
2647
2648 name_width = (options->stat_name_width > 0 &&
2649 options->stat_name_width < max_len) ?
2650 options->stat_name_width : max_len;
2651
2652 /*
2653 * Adjust adjustable widths not to exceed maximum width
2654 */
2655 if (name_width + number_width + 6 + graph_width > width) {
2656 if (graph_width > width * 3/8 - number_width - 6) {
2657 graph_width = width * 3/8 - number_width - 6;
2658 if (graph_width < 6)
2659 graph_width = 6;
2660 }
2661
2662 if (options->stat_graph_width &&
2663 graph_width > options->stat_graph_width)
2664 graph_width = options->stat_graph_width;
2665 if (name_width > width - number_width - 6 - graph_width)
2666 name_width = width - number_width - 6 - graph_width;
2667 else
2668 graph_width = width - number_width - 6 - name_width;
2669 }
2670
2671 /*
2672 * From here name_width is the width of the name area,
2673 * and graph_width is the width of the graph area.
2674 * max_change is used to scale graph properly.
2675 */
2676 for (i = 0; i < count; i++) {
2677 const char *prefix = "";
2678 struct diffstat_file *file = data->files[i];
2679 char *name = file->print_name;
2680 uintmax_t added = file->added;
2681 uintmax_t deleted = file->deleted;
2682 int name_len;
2683
2684 if (!file->is_interesting && (added + deleted == 0))
2685 continue;
2686
2687 /*
2688 * "scale" the filename
2689 */
2690 len = name_width;
2691 name_len = strlen(name);
2692 if (name_width < name_len) {
2693 char *slash;
2694 prefix = "...";
2695 len -= 3;
2696 name += name_len - len;
2697 slash = strchr(name, '/');
2698 if (slash)
2699 name = slash;
2700 }
2701
2702 if (file->is_binary) {
2703 strbuf_addf(&out, " %s%-*s |", prefix, len, name);
2704 strbuf_addf(&out, " %*s", number_width, "Bin");
2705 if (!added && !deleted) {
2706 strbuf_addch(&out, '\n');
2707 emit_diff_symbol(options, DIFF_SYMBOL_STATS_LINE,
2708 out.buf, out.len, 0);
2709 strbuf_reset(&out);
2710 continue;
2711 }
2712 strbuf_addf(&out, " %s%"PRIuMAX"%s",
2713 del_c, deleted, reset);
2714 strbuf_addstr(&out, " -> ");
2715 strbuf_addf(&out, "%s%"PRIuMAX"%s",
2716 add_c, added, reset);
2717 strbuf_addstr(&out, " bytes\n");
2718 emit_diff_symbol(options, DIFF_SYMBOL_STATS_LINE,
2719 out.buf, out.len, 0);
2720 strbuf_reset(&out);
2721 continue;
2722 }
2723 else if (file->is_unmerged) {
2724 strbuf_addf(&out, " %s%-*s |", prefix, len, name);
2725 strbuf_addstr(&out, " Unmerged\n");
2726 emit_diff_symbol(options, DIFF_SYMBOL_STATS_LINE,
2727 out.buf, out.len, 0);
2728 strbuf_reset(&out);
2729 continue;
2730 }
2731
2732 /*
2733 * scale the add/delete
2734 */
2735 add = added;
2736 del = deleted;
2737
2738 if (graph_width <= max_change) {
2739 int total = scale_linear(add + del, graph_width, max_change);
2740 if (total < 2 && add && del)
2741 /* width >= 2 due to the sanity check */
2742 total = 2;
2743 if (add < del) {
2744 add = scale_linear(add, graph_width, max_change);
2745 del = total - add;
2746 } else {
2747 del = scale_linear(del, graph_width, max_change);
2748 add = total - del;
2749 }
2750 }
2751 strbuf_addf(&out, " %s%-*s |", prefix, len, name);
2752 strbuf_addf(&out, " %*"PRIuMAX"%s",
2753 number_width, added + deleted,
2754 added + deleted ? " " : "");
2755 show_graph(&out, '+', add, add_c, reset);
2756 show_graph(&out, '-', del, del_c, reset);
2757 strbuf_addch(&out, '\n');
2758 emit_diff_symbol(options, DIFF_SYMBOL_STATS_LINE,
2759 out.buf, out.len, 0);
2760 strbuf_reset(&out);
2761 }
2762
2763 for (i = 0; i < data->nr; i++) {
2764 struct diffstat_file *file = data->files[i];
2765 uintmax_t added = file->added;
2766 uintmax_t deleted = file->deleted;
2767
2768 if (file->is_unmerged ||
2769 (!file->is_interesting && (added + deleted == 0))) {
2770 total_files--;
2771 continue;
2772 }
2773
2774 if (!file->is_binary) {
2775 adds += added;
2776 dels += deleted;
2777 }
2778 if (i < count)
2779 continue;
2780 if (!extra_shown)
2781 emit_diff_symbol(options,
2782 DIFF_SYMBOL_STATS_SUMMARY_ABBREV,
2783 NULL, 0, 0);
2784 extra_shown = 1;
2785 }
2786
2787 print_stat_summary_inserts_deletes(options, total_files, adds, dels);
2788 strbuf_release(&out);
2789 }
2790
2791 static void show_shortstats(struct diffstat_t *data, struct diff_options *options)
2792 {
2793 int i, adds = 0, dels = 0, total_files = data->nr;
2794
2795 if (data->nr == 0)
2796 return;
2797
2798 for (i = 0; i < data->nr; i++) {
2799 int added = data->files[i]->added;
2800 int deleted = data->files[i]->deleted;
2801
2802 if (data->files[i]->is_unmerged ||
2803 (!data->files[i]->is_interesting && (added + deleted == 0))) {
2804 total_files--;
2805 } else if (!data->files[i]->is_binary) { /* don't count bytes */
2806 adds += added;
2807 dels += deleted;
2808 }
2809 }
2810 print_stat_summary_inserts_deletes(options, total_files, adds, dels);
2811 }
2812
2813 static void show_numstat(struct diffstat_t *data, struct diff_options *options)
2814 {
2815 int i;
2816
2817 if (data->nr == 0)
2818 return;
2819
2820 for (i = 0; i < data->nr; i++) {
2821 struct diffstat_file *file = data->files[i];
2822
2823 fprintf(options->file, "%s", diff_line_prefix(options));
2824
2825 if (file->is_binary)
2826 fprintf(options->file, "-\t-\t");
2827 else
2828 fprintf(options->file,
2829 "%"PRIuMAX"\t%"PRIuMAX"\t",
2830 file->added, file->deleted);
2831 if (options->line_termination) {
2832 fill_print_name(file);
2833 if (!file->is_renamed)
2834 write_name_quoted(file->name, options->file,
2835 options->line_termination);
2836 else {
2837 fputs(file->print_name, options->file);
2838 putc(options->line_termination, options->file);
2839 }
2840 } else {
2841 if (file->is_renamed) {
2842 putc('\0', options->file);
2843 write_name_quoted(file->from_name, options->file, '\0');
2844 }
2845 write_name_quoted(file->name, options->file, '\0');
2846 }
2847 }
2848 }
2849
2850 struct dirstat_file {
2851 const char *name;
2852 unsigned long changed;
2853 };
2854
2855 struct dirstat_dir {
2856 struct dirstat_file *files;
2857 int alloc, nr, permille, cumulative;
2858 };
2859
2860 static long gather_dirstat(struct diff_options *opt, struct dirstat_dir *dir,
2861 unsigned long changed, const char *base, int baselen)
2862 {
2863 unsigned long sum_changes = 0;
2864 unsigned int sources = 0;
2865 const char *line_prefix = diff_line_prefix(opt);
2866
2867 while (dir->nr) {
2868 struct dirstat_file *f = dir->files;
2869 int namelen = strlen(f->name);
2870 unsigned long changes;
2871 char *slash;
2872
2873 if (namelen < baselen)
2874 break;
2875 if (memcmp(f->name, base, baselen))
2876 break;
2877 slash = strchr(f->name + baselen, '/');
2878 if (slash) {
2879 int newbaselen = slash + 1 - f->name;
2880 changes = gather_dirstat(opt, dir, changed, f->name, newbaselen);
2881 sources++;
2882 } else {
2883 changes = f->changed;
2884 dir->files++;
2885 dir->nr--;
2886 sources += 2;
2887 }
2888 sum_changes += changes;
2889 }
2890
2891 /*
2892 * We don't report dirstat's for
2893 * - the top level
2894 * - or cases where everything came from a single directory
2895 * under this directory (sources == 1).
2896 */
2897 if (baselen && sources != 1) {
2898 if (sum_changes) {
2899 int permille = sum_changes * 1000 / changed;
2900 if (permille >= dir->permille) {
2901 fprintf(opt->file, "%s%4d.%01d%% %.*s\n", line_prefix,
2902 permille / 10, permille % 10, baselen, base);
2903 if (!dir->cumulative)
2904 return 0;
2905 }
2906 }
2907 }
2908 return sum_changes;
2909 }
2910
2911 static int dirstat_compare(const void *_a, const void *_b)
2912 {
2913 const struct dirstat_file *a = _a;
2914 const struct dirstat_file *b = _b;
2915 return strcmp(a->name, b->name);
2916 }
2917
2918 static void show_dirstat(struct diff_options *options)
2919 {
2920 int i;
2921 unsigned long changed;
2922 struct dirstat_dir dir;
2923 struct diff_queue_struct *q = &diff_queued_diff;
2924
2925 dir.files = NULL;
2926 dir.alloc = 0;
2927 dir.nr = 0;
2928 dir.permille = options->dirstat_permille;
2929 dir.cumulative = options->flags.dirstat_cumulative;
2930
2931 changed = 0;
2932 for (i = 0; i < q->nr; i++) {
2933 struct diff_filepair *p = q->queue[i];
2934 const char *name;
2935 unsigned long copied, added, damage;
2936 int content_changed;
2937
2938 name = p->two->path ? p->two->path : p->one->path;
2939
2940 if (p->one->oid_valid && p->two->oid_valid)
2941 content_changed = oidcmp(&p->one->oid, &p->two->oid);
2942 else
2943 content_changed = 1;
2944
2945 if (!content_changed) {
2946 /*
2947 * The SHA1 has not changed, so pre-/post-content is
2948 * identical. We can therefore skip looking at the
2949 * file contents altogether.
2950 */
2951 damage = 0;
2952 goto found_damage;
2953 }
2954
2955 if (options->flags.dirstat_by_file) {
2956 /*
2957 * In --dirstat-by-file mode, we don't really need to
2958 * look at the actual file contents at all.
2959 * The fact that the SHA1 changed is enough for us to
2960 * add this file to the list of results
2961 * (with each file contributing equal damage).
2962 */
2963 damage = 1;
2964 goto found_damage;
2965 }
2966
2967 if (DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) {
2968 diff_populate_filespec(p->one, 0);
2969 diff_populate_filespec(p->two, 0);
2970 diffcore_count_changes(p->one, p->two, NULL, NULL,
2971 &copied, &added);
2972 diff_free_filespec_data(p->one);
2973 diff_free_filespec_data(p->two);
2974 } else if (DIFF_FILE_VALID(p->one)) {
2975 diff_populate_filespec(p->one, CHECK_SIZE_ONLY);
2976 copied = added = 0;
2977 diff_free_filespec_data(p->one);
2978 } else if (DIFF_FILE_VALID(p->two)) {
2979 diff_populate_filespec(p->two, CHECK_SIZE_ONLY);
2980 copied = 0;
2981 added = p->two->size;
2982 diff_free_filespec_data(p->two);
2983 } else
2984 continue;
2985
2986 /*
2987 * Original minus copied is the removed material,
2988 * added is the new material. They are both damages
2989 * made to the preimage.
2990 * If the resulting damage is zero, we know that
2991 * diffcore_count_changes() considers the two entries to
2992 * be identical, but since content_changed is true, we
2993 * know that there must have been _some_ kind of change,
2994 * so we force all entries to have damage > 0.
2995 */
2996 damage = (p->one->size - copied) + added;
2997 if (!damage)
2998 damage = 1;
2999
3000 found_damage:
3001 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
3002 dir.files[dir.nr].name = name;
3003 dir.files[dir.nr].changed = damage;
3004 changed += damage;
3005 dir.nr++;
3006 }
3007
3008 /* This can happen even with many files, if everything was renames */
3009 if (!changed)
3010 return;
3011
3012 /* Show all directories with more than x% of the changes */
3013 QSORT(dir.files, dir.nr, dirstat_compare);
3014 gather_dirstat(options, &dir, changed, "", 0);
3015 }
3016
3017 static void show_dirstat_by_line(struct diffstat_t *data, struct diff_options *options)
3018 {
3019 int i;
3020 unsigned long changed;
3021 struct dirstat_dir dir;
3022
3023 if (data->nr == 0)
3024 return;
3025
3026 dir.files = NULL;
3027 dir.alloc = 0;
3028 dir.nr = 0;
3029 dir.permille = options->dirstat_permille;
3030 dir.cumulative = options->flags.dirstat_cumulative;
3031
3032 changed = 0;
3033 for (i = 0; i < data->nr; i++) {
3034 struct diffstat_file *file = data->files[i];
3035 unsigned long damage = file->added + file->deleted;
3036 if (file->is_binary)
3037 /*
3038 * binary files counts bytes, not lines. Must find some
3039 * way to normalize binary bytes vs. textual lines.
3040 * The following heuristic assumes that there are 64
3041 * bytes per "line".
3042 * This is stupid and ugly, but very cheap...
3043 */
3044 damage = DIV_ROUND_UP(damage, 64);
3045 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
3046 dir.files[dir.nr].name = file->name;
3047 dir.files[dir.nr].changed = damage;
3048 changed += damage;
3049 dir.nr++;
3050 }
3051
3052 /* This can happen even with many files, if everything was renames */
3053 if (!changed)
3054 return;
3055
3056 /* Show all directories with more than x% of the changes */
3057 QSORT(dir.files, dir.nr, dirstat_compare);
3058 gather_dirstat(options, &dir, changed, "", 0);
3059 }
3060
3061 static void free_diffstat_info(struct diffstat_t *diffstat)
3062 {
3063 int i;
3064 for (i = 0; i < diffstat->nr; i++) {
3065 struct diffstat_file *f = diffstat->files[i];
3066 free(f->print_name);
3067 free(f->name);
3068 free(f->from_name);
3069 free(f);
3070 }
3071 free(diffstat->files);
3072 }
3073
3074 struct checkdiff_t {
3075 const char *filename;
3076 int lineno;
3077 int conflict_marker_size;
3078 struct diff_options *o;
3079 unsigned ws_rule;
3080 unsigned status;
3081 };
3082
3083 static int is_conflict_marker(const char *line, int marker_size, unsigned long len)
3084 {
3085 char firstchar;
3086 int cnt;
3087
3088 if (len < marker_size + 1)
3089 return 0;
3090 firstchar = line[0];
3091 switch (firstchar) {
3092 case '=': case '>': case '<': case '|':
3093 break;
3094 default:
3095 return 0;
3096 }
3097 for (cnt = 1; cnt < marker_size; cnt++)
3098 if (line[cnt] != firstchar)
3099 return 0;
3100 /* line[1] thru line[marker_size-1] are same as firstchar */
3101 if (len < marker_size + 1 || !isspace(line[marker_size]))
3102 return 0;
3103 return 1;
3104 }
3105
3106 static void checkdiff_consume(void *priv, char *line, unsigned long len)
3107 {
3108 struct checkdiff_t *data = priv;
3109 int marker_size = data->conflict_marker_size;
3110 const char *ws = diff_get_color(data->o->use_color, DIFF_WHITESPACE);
3111 const char *reset = diff_get_color(data->o->use_color, DIFF_RESET);
3112 const char *set = diff_get_color(data->o->use_color, DIFF_FILE_NEW);
3113 char *err;
3114 const char *line_prefix;
3115
3116 assert(data->o);
3117 line_prefix = diff_line_prefix(data->o);
3118
3119 if (line[0] == '+') {
3120 unsigned bad;
3121 data->lineno++;
3122 if (is_conflict_marker(line + 1, marker_size, len - 1)) {
3123 data->status |= 1;
3124 fprintf(data->o->file,
3125 "%s%s:%d: leftover conflict marker\n",
3126 line_prefix, data->filename, data->lineno);
3127 }
3128 bad = ws_check(line + 1, len - 1, data->ws_rule);
3129 if (!bad)
3130 return;
3131 data->status |= bad;
3132 err = whitespace_error_string(bad);
3133 fprintf(data->o->file, "%s%s:%d: %s.\n",
3134 line_prefix, data->filename, data->lineno, err);
3135 free(err);
3136 emit_line(data->o, set, reset, line, 1);
3137 ws_check_emit(line + 1, len - 1, data->ws_rule,
3138 data->o->file, set, reset, ws);
3139 } else if (line[0] == ' ') {
3140 data->lineno++;
3141 } else if (line[0] == '@') {
3142 char *plus = strchr(line, '+');
3143 if (plus)
3144 data->lineno = strtol(plus, NULL, 10) - 1;
3145 else
3146 die("invalid diff");
3147 }
3148 }
3149
3150 static unsigned char *deflate_it(char *data,
3151 unsigned long size,
3152 unsigned long *result_size)
3153 {
3154 int bound;
3155 unsigned char *deflated;
3156 git_zstream stream;
3157
3158 git_deflate_init(&stream, zlib_compression_level);
3159 bound = git_deflate_bound(&stream, size);
3160 deflated = xmalloc(bound);
3161 stream.next_out = deflated;
3162 stream.avail_out = bound;
3163
3164 stream.next_in = (unsigned char *)data;
3165 stream.avail_in = size;
3166 while (git_deflate(&stream, Z_FINISH) == Z_OK)
3167 ; /* nothing */
3168 git_deflate_end(&stream);
3169 *result_size = stream.total_out;
3170 return deflated;
3171 }
3172
3173 static void emit_binary_diff_body(struct diff_options *o,
3174 mmfile_t *one, mmfile_t *two)
3175 {
3176 void *cp;
3177 void *delta;
3178 void *deflated;
3179 void *data;
3180 unsigned long orig_size;
3181 unsigned long delta_size;
3182 unsigned long deflate_size;
3183 unsigned long data_size;
3184
3185 /* We could do deflated delta, or we could do just deflated two,
3186 * whichever is smaller.
3187 */
3188 delta = NULL;
3189 deflated = deflate_it(two->ptr, two->size, &deflate_size);
3190 if (one->size && two->size) {
3191 delta = diff_delta(one->ptr, one->size,
3192 two->ptr, two->size,
3193 &delta_size, deflate_size);
3194 if (delta) {
3195 void *to_free = delta;
3196 orig_size = delta_size;
3197 delta = deflate_it(delta, delta_size, &delta_size);
3198 free(to_free);
3199 }
3200 }
3201
3202 if (delta && delta_size < deflate_size) {
3203 char *s = xstrfmt("%lu", orig_size);
3204 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_HEADER_DELTA,
3205 s, strlen(s), 0);
3206 free(s);
3207 free(deflated);
3208 data = delta;
3209 data_size = delta_size;
3210 } else {
3211 char *s = xstrfmt("%lu", two->size);
3212 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_HEADER_LITERAL,
3213 s, strlen(s), 0);
3214 free(s);
3215 free(delta);
3216 data = deflated;
3217 data_size = deflate_size;
3218 }
3219
3220 /* emit data encoded in base85 */
3221 cp = data;
3222 while (data_size) {
3223 int len;
3224 int bytes = (52 < data_size) ? 52 : data_size;
3225 char line[71];
3226 data_size -= bytes;
3227 if (bytes <= 26)
3228 line[0] = bytes + 'A' - 1;
3229 else
3230 line[0] = bytes - 26 + 'a' - 1;
3231 encode_85(line + 1, cp, bytes);
3232 cp = (char *) cp + bytes;
3233
3234 len = strlen(line);
3235 line[len++] = '\n';
3236 line[len] = '\0';
3237
3238 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_BODY,
3239 line, len, 0);
3240 }
3241 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_FOOTER, NULL, 0, 0);
3242 free(data);
3243 }
3244
3245 static void emit_binary_diff(struct diff_options *o,
3246 mmfile_t *one, mmfile_t *two)
3247 {
3248 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_HEADER, NULL, 0, 0);
3249 emit_binary_diff_body(o, one, two);
3250 emit_binary_diff_body(o, two, one);
3251 }
3252
3253 int diff_filespec_is_binary(struct diff_filespec *one)
3254 {
3255 if (one->is_binary == -1) {
3256 diff_filespec_load_driver(one);
3257 if (one->driver->binary != -1)
3258 one->is_binary = one->driver->binary;
3259 else {
3260 if (!one->data && DIFF_FILE_VALID(one))
3261 diff_populate_filespec(one, CHECK_BINARY);
3262 if (one->is_binary == -1 && one->data)
3263 one->is_binary = buffer_is_binary(one->data,
3264 one->size);
3265 if (one->is_binary == -1)
3266 one->is_binary = 0;
3267 }
3268 }
3269 return one->is_binary;
3270 }
3271
3272 static const struct userdiff_funcname *diff_funcname_pattern(struct diff_filespec *one)
3273 {
3274 diff_filespec_load_driver(one);
3275 return one->driver->funcname.pattern ? &one->driver->funcname : NULL;
3276 }
3277
3278 void diff_set_mnemonic_prefix(struct diff_options *options, const char *a, const char *b)
3279 {
3280 if (!options->a_prefix)
3281 options->a_prefix = a;
3282 if (!options->b_prefix)
3283 options->b_prefix = b;
3284 }
3285
3286 struct userdiff_driver *get_textconv(struct diff_filespec *one)
3287 {
3288 if (!DIFF_FILE_VALID(one))
3289 return NULL;
3290
3291 diff_filespec_load_driver(one);
3292 return userdiff_get_textconv(one->driver);
3293 }
3294
3295 static void builtin_diff(const char *name_a,
3296 const char *name_b,
3297 struct diff_filespec *one,
3298 struct diff_filespec *two,
3299 const char *xfrm_msg,
3300 int must_show_header,
3301 struct diff_options *o,
3302 int complete_rewrite)
3303 {
3304 mmfile_t mf1, mf2;
3305 const char *lbl[2];
3306 char *a_one, *b_two;
3307 const char *meta = diff_get_color_opt(o, DIFF_METAINFO);
3308 const char *reset = diff_get_color_opt(o, DIFF_RESET);
3309 const char *a_prefix, *b_prefix;
3310 struct userdiff_driver *textconv_one = NULL;
3311 struct userdiff_driver *textconv_two = NULL;
3312 struct strbuf header = STRBUF_INIT;
3313 const char *line_prefix = diff_line_prefix(o);
3314
3315 diff_set_mnemonic_prefix(o, "a/", "b/");
3316 if (o->flags.reverse_diff) {
3317 a_prefix = o->b_prefix;
3318 b_prefix = o->a_prefix;
3319 } else {
3320 a_prefix = o->a_prefix;
3321 b_prefix = o->b_prefix;
3322 }
3323
3324 if (o->submodule_format == DIFF_SUBMODULE_LOG &&
3325 (!one->mode || S_ISGITLINK(one->mode)) &&
3326 (!two->mode || S_ISGITLINK(two->mode))) {
3327 show_submodule_summary(o, one->path ? one->path : two->path,
3328 &one->oid, &two->oid,
3329 two->dirty_submodule);
3330 return;
3331 } else if (o->submodule_format == DIFF_SUBMODULE_INLINE_DIFF &&
3332 (!one->mode || S_ISGITLINK(one->mode)) &&
3333 (!two->mode || S_ISGITLINK(two->mode))) {
3334 show_submodule_inline_diff(o, one->path ? one->path : two->path,
3335 &one->oid, &two->oid,
3336 two->dirty_submodule);
3337 return;
3338 }
3339
3340 if (o->flags.allow_textconv) {
3341 textconv_one = get_textconv(one);
3342 textconv_two = get_textconv(two);
3343 }
3344
3345 /* Never use a non-valid filename anywhere if at all possible */
3346 name_a = DIFF_FILE_VALID(one) ? name_a : name_b;
3347 name_b = DIFF_FILE_VALID(two) ? name_b : name_a;
3348
3349 a_one = quote_two(a_prefix, name_a + (*name_a == '/'));
3350 b_two = quote_two(b_prefix, name_b + (*name_b == '/'));
3351 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
3352 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
3353 strbuf_addf(&header, "%s%sdiff --git %s %s%s\n", line_prefix, meta, a_one, b_two, reset);
3354 if (lbl[0][0] == '/') {
3355 /* /dev/null */
3356 strbuf_addf(&header, "%s%snew file mode %06o%s\n", line_prefix, meta, two->mode, reset);
3357 if (xfrm_msg)
3358 strbuf_addstr(&header, xfrm_msg);
3359 must_show_header = 1;
3360 }
3361 else if (lbl[1][0] == '/') {
3362 strbuf_addf(&header, "%s%sdeleted file mode %06o%s\n", line_prefix, meta, one->mode, reset);
3363 if (xfrm_msg)
3364 strbuf_addstr(&header, xfrm_msg);
3365 must_show_header = 1;
3366 }
3367 else {
3368 if (one->mode != two->mode) {
3369 strbuf_addf(&header, "%s%sold mode %06o%s\n", line_prefix, meta, one->mode, reset);
3370 strbuf_addf(&header, "%s%snew mode %06o%s\n", line_prefix, meta, two->mode, reset);
3371 must_show_header = 1;
3372 }
3373 if (xfrm_msg)
3374 strbuf_addstr(&header, xfrm_msg);
3375
3376 /*
3377 * we do not run diff between different kind
3378 * of objects.
3379 */
3380 if ((one->mode ^ two->mode) & S_IFMT)
3381 goto free_ab_and_return;
3382 if (complete_rewrite &&
3383 (textconv_one || !diff_filespec_is_binary(one)) &&
3384 (textconv_two || !diff_filespec_is_binary(two))) {
3385 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
3386 header.buf, header.len, 0);
3387 strbuf_reset(&header);
3388 emit_rewrite_diff(name_a, name_b, one, two,
3389 textconv_one, textconv_two, o);
3390 o->found_changes = 1;
3391 goto free_ab_and_return;
3392 }
3393 }
3394
3395 if (o->irreversible_delete && lbl[1][0] == '/') {
3396 emit_diff_symbol(o, DIFF_SYMBOL_HEADER, header.buf,
3397 header.len, 0);
3398 strbuf_reset(&header);
3399 goto free_ab_and_return;
3400 } else if (!o->flags.text &&
3401 ( (!textconv_one && diff_filespec_is_binary(one)) ||
3402 (!textconv_two && diff_filespec_is_binary(two)) )) {
3403 struct strbuf sb = STRBUF_INIT;
3404 if (!one->data && !two->data &&
3405 S_ISREG(one->mode) && S_ISREG(two->mode) &&
3406 !o->flags.binary) {
3407 if (!oidcmp(&one->oid, &two->oid)) {
3408 if (must_show_header)
3409 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
3410 header.buf, header.len,
3411 0);
3412 goto free_ab_and_return;
3413 }
3414 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
3415 header.buf, header.len, 0);
3416 strbuf_addf(&sb, "%sBinary files %s and %s differ\n",
3417 diff_line_prefix(o), lbl[0], lbl[1]);
3418 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_FILES,
3419 sb.buf, sb.len, 0);
3420 strbuf_release(&sb);
3421 goto free_ab_and_return;
3422 }
3423 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
3424 die("unable to read files to diff");
3425 /* Quite common confusing case */
3426 if (mf1.size == mf2.size &&
3427 !memcmp(mf1.ptr, mf2.ptr, mf1.size)) {
3428 if (must_show_header)
3429 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
3430 header.buf, header.len, 0);
3431 goto free_ab_and_return;
3432 }
3433 emit_diff_symbol(o, DIFF_SYMBOL_HEADER, header.buf, header.len, 0);
3434 strbuf_reset(&header);
3435 if (o->flags.binary)
3436 emit_binary_diff(o, &mf1, &mf2);
3437 else {
3438 strbuf_addf(&sb, "%sBinary files %s and %s differ\n",
3439 diff_line_prefix(o), lbl[0], lbl[1]);
3440 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_FILES,
3441 sb.buf, sb.len, 0);
3442 strbuf_release(&sb);
3443 }
3444 o->found_changes = 1;
3445 } else {
3446 /* Crazy xdl interfaces.. */
3447 const char *diffopts = getenv("GIT_DIFF_OPTS");
3448 const char *v;
3449 xpparam_t xpp;
3450 xdemitconf_t xecfg;
3451 struct emit_callback ecbdata;
3452 const struct userdiff_funcname *pe;
3453
3454 if (must_show_header) {
3455 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
3456 header.buf, header.len, 0);
3457 strbuf_reset(&header);
3458 }
3459
3460 mf1.size = fill_textconv(textconv_one, one, &mf1.ptr);
3461 mf2.size = fill_textconv(textconv_two, two, &mf2.ptr);
3462
3463 pe = diff_funcname_pattern(one);
3464 if (!pe)
3465 pe = diff_funcname_pattern(two);
3466
3467 memset(&xpp, 0, sizeof(xpp));
3468 memset(&xecfg, 0, sizeof(xecfg));
3469 memset(&ecbdata, 0, sizeof(ecbdata));
3470 if (o->flags.suppress_diff_headers)
3471 lbl[0] = NULL;
3472 ecbdata.label_path = lbl;
3473 ecbdata.color_diff = want_color(o->use_color);
3474 ecbdata.ws_rule = whitespace_rule(name_b);
3475 if (ecbdata.ws_rule & WS_BLANK_AT_EOF)
3476 check_blank_at_eof(&mf1, &mf2, &ecbdata);
3477 ecbdata.opt = o;
3478 if (header.len && !o->flags.suppress_diff_headers)
3479 ecbdata.header = &header;
3480 xpp.flags = o->xdl_opts;
3481 xpp.anchors = o->anchors;
3482 xpp.anchors_nr = o->anchors_nr;
3483 xecfg.ctxlen = o->context;
3484 xecfg.interhunkctxlen = o->interhunkcontext;
3485 xecfg.flags = XDL_EMIT_FUNCNAMES;
3486 if (o->flags.funccontext)
3487 xecfg.flags |= XDL_EMIT_FUNCCONTEXT;
3488 if (pe)
3489 xdiff_set_find_func(&xecfg, pe->pattern, pe->cflags);
3490 if (!diffopts)
3491 ;
3492 else if (skip_prefix(diffopts, "--unified=", &v))
3493 xecfg.ctxlen = strtoul(v, NULL, 10);
3494 else if (skip_prefix(diffopts, "-u", &v))
3495 xecfg.ctxlen = strtoul(v, NULL, 10);
3496 if (o->word_diff)
3497 init_diff_words_data(&ecbdata, o, one, two);
3498 if (xdi_diff_outf(&mf1, &mf2, fn_out_consume, &ecbdata,
3499 &xpp, &xecfg))
3500 die("unable to generate diff for %s", one->path);
3501 if (o->word_diff)
3502 free_diff_words_data(&ecbdata);
3503 if (textconv_one)
3504 free(mf1.ptr);
3505 if (textconv_two)
3506 free(mf2.ptr);
3507 xdiff_clear_find_func(&xecfg);
3508 }
3509
3510 free_ab_and_return:
3511 strbuf_release(&header);
3512 diff_free_filespec_data(one);
3513 diff_free_filespec_data(two);
3514 free(a_one);
3515 free(b_two);
3516 return;
3517 }
3518
3519 static char *get_compact_summary(const struct diff_filepair *p, int is_renamed)
3520 {
3521 if (!is_renamed) {
3522 if (p->status == DIFF_STATUS_ADDED) {
3523 if (S_ISLNK(p->two->mode))
3524 return "new +l";
3525 else if ((p->two->mode & 0777) == 0755)
3526 return "new +x";
3527 else
3528 return "new";
3529 } else if (p->status == DIFF_STATUS_DELETED)
3530 return "gone";
3531 }
3532 if (S_ISLNK(p->one->mode) && !S_ISLNK(p->two->mode))
3533 return "mode -l";
3534 else if (!S_ISLNK(p->one->mode) && S_ISLNK(p->two->mode))
3535 return "mode +l";
3536 else if ((p->one->mode & 0777) == 0644 &&
3537 (p->two->mode & 0777) == 0755)
3538 return "mode +x";
3539 else if ((p->one->mode & 0777) == 0755 &&
3540 (p->two->mode & 0777) == 0644)
3541 return "mode -x";
3542 return NULL;
3543 }
3544
3545 static void builtin_diffstat(const char *name_a, const char *name_b,
3546 struct diff_filespec *one,
3547 struct diff_filespec *two,
3548 struct diffstat_t *diffstat,
3549 struct diff_options *o,
3550 struct diff_filepair *p)
3551 {
3552 mmfile_t mf1, mf2;
3553 struct diffstat_file *data;
3554 int same_contents;
3555 int complete_rewrite = 0;
3556
3557 if (!DIFF_PAIR_UNMERGED(p)) {
3558 if (p->status == DIFF_STATUS_MODIFIED && p->score)
3559 complete_rewrite = 1;
3560 }
3561
3562 data = diffstat_add(diffstat, name_a, name_b);
3563 data->is_interesting = p->status != DIFF_STATUS_UNKNOWN;
3564 if (o->flags.stat_with_summary)
3565 data->comments = get_compact_summary(p, data->is_renamed);
3566
3567 if (!one || !two) {
3568 data->is_unmerged = 1;
3569 return;
3570 }
3571
3572 same_contents = !oidcmp(&one->oid, &two->oid);
3573
3574 if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
3575 data->is_binary = 1;
3576 if (same_contents) {
3577 data->added = 0;
3578 data->deleted = 0;
3579 } else {
3580 data->added = diff_filespec_size(two);
3581 data->deleted = diff_filespec_size(one);
3582 }
3583 }
3584
3585 else if (complete_rewrite) {
3586 diff_populate_filespec(one, 0);
3587 diff_populate_filespec(two, 0);
3588 data->deleted = count_lines(one->data, one->size);
3589 data->added = count_lines(two->data, two->size);
3590 }
3591
3592 else if (!same_contents) {
3593 /* Crazy xdl interfaces.. */
3594 xpparam_t xpp;
3595 xdemitconf_t xecfg;
3596
3597 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
3598 die("unable to read files to diff");
3599
3600 memset(&xpp, 0, sizeof(xpp));
3601 memset(&xecfg, 0, sizeof(xecfg));
3602 xpp.flags = o->xdl_opts;
3603 xpp.anchors = o->anchors;
3604 xpp.anchors_nr = o->anchors_nr;
3605 xecfg.ctxlen = o->context;
3606 xecfg.interhunkctxlen = o->interhunkcontext;
3607 if (xdi_diff_outf(&mf1, &mf2, diffstat_consume, diffstat,
3608 &xpp, &xecfg))
3609 die("unable to generate diffstat for %s", one->path);
3610 }
3611
3612 diff_free_filespec_data(one);
3613 diff_free_filespec_data(two);
3614 }
3615
3616 static void builtin_checkdiff(const char *name_a, const char *name_b,
3617 const char *attr_path,
3618 struct diff_filespec *one,
3619 struct diff_filespec *two,
3620 struct diff_options *o)
3621 {
3622 mmfile_t mf1, mf2;
3623 struct checkdiff_t data;
3624
3625 if (!two)
3626 return;
3627
3628 memset(&data, 0, sizeof(data));
3629 data.filename = name_b ? name_b : name_a;
3630 data.lineno = 0;
3631 data.o = o;
3632 data.ws_rule = whitespace_rule(attr_path);
3633 data.conflict_marker_size = ll_merge_marker_size(attr_path);
3634
3635 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
3636 die("unable to read files to diff");
3637
3638 /*
3639 * All the other codepaths check both sides, but not checking
3640 * the "old" side here is deliberate. We are checking the newly
3641 * introduced changes, and as long as the "new" side is text, we
3642 * can and should check what it introduces.
3643 */
3644 if (diff_filespec_is_binary(two))
3645 goto free_and_return;
3646 else {
3647 /* Crazy xdl interfaces.. */
3648 xpparam_t xpp;
3649 xdemitconf_t xecfg;
3650
3651 memset(&xpp, 0, sizeof(xpp));
3652 memset(&xecfg, 0, sizeof(xecfg));
3653 xecfg.ctxlen = 1; /* at least one context line */
3654 xpp.flags = 0;
3655 if (xdi_diff_outf(&mf1, &mf2, checkdiff_consume, &data,
3656 &xpp, &xecfg))
3657 die("unable to generate checkdiff for %s", one->path);
3658
3659 if (data.ws_rule & WS_BLANK_AT_EOF) {
3660 struct emit_callback ecbdata;
3661 int blank_at_eof;
3662
3663 ecbdata.ws_rule = data.ws_rule;
3664 check_blank_at_eof(&mf1, &mf2, &ecbdata);
3665 blank_at_eof = ecbdata.blank_at_eof_in_postimage;
3666
3667 if (blank_at_eof) {
3668 static char *err;
3669 if (!err)
3670 err = whitespace_error_string(WS_BLANK_AT_EOF);
3671 fprintf(o->file, "%s:%d: %s.\n",
3672 data.filename, blank_at_eof, err);
3673 data.status = 1; /* report errors */
3674 }
3675 }
3676 }
3677 free_and_return:
3678 diff_free_filespec_data(one);
3679 diff_free_filespec_data(two);
3680 if (data.status)
3681 o->flags.check_failed = 1;
3682 }
3683
3684 struct diff_filespec *alloc_filespec(const char *path)
3685 {
3686 struct diff_filespec *spec;
3687
3688 FLEXPTR_ALLOC_STR(spec, path, path);
3689 spec->count = 1;
3690 spec->is_binary = -1;
3691 return spec;
3692 }
3693
3694 void free_filespec(struct diff_filespec *spec)
3695 {
3696 if (!--spec->count) {
3697 diff_free_filespec_data(spec);
3698 free(spec);
3699 }
3700 }
3701
3702 void fill_filespec(struct diff_filespec *spec, const struct object_id *oid,
3703 int oid_valid, unsigned short mode)
3704 {
3705 if (mode) {
3706 spec->mode = canon_mode(mode);
3707 oidcpy(&spec->oid, oid);
3708 spec->oid_valid = oid_valid;
3709 }
3710 }
3711
3712 /*
3713 * Given a name and sha1 pair, if the index tells us the file in
3714 * the work tree has that object contents, return true, so that
3715 * prepare_temp_file() does not have to inflate and extract.
3716 */
3717 static int reuse_worktree_file(const char *name, const struct object_id *oid, int want_file)
3718 {
3719 const struct cache_entry *ce;
3720 struct stat st;
3721 int pos, len;
3722
3723 /*
3724 * We do not read the cache ourselves here, because the
3725 * benchmark with my previous version that always reads cache
3726 * shows that it makes things worse for diff-tree comparing
3727 * two linux-2.6 kernel trees in an already checked out work
3728 * tree. This is because most diff-tree comparisons deal with
3729 * only a small number of files, while reading the cache is
3730 * expensive for a large project, and its cost outweighs the
3731 * savings we get by not inflating the object to a temporary
3732 * file. Practically, this code only helps when we are used
3733 * by diff-cache --cached, which does read the cache before
3734 * calling us.
3735 */
3736 if (!active_cache)
3737 return 0;
3738
3739 /* We want to avoid the working directory if our caller
3740 * doesn't need the data in a normal file, this system
3741 * is rather slow with its stat/open/mmap/close syscalls,
3742 * and the object is contained in a pack file. The pack
3743 * is probably already open and will be faster to obtain
3744 * the data through than the working directory. Loose
3745 * objects however would tend to be slower as they need
3746 * to be individually opened and inflated.
3747 */
3748 if (!FAST_WORKING_DIRECTORY && !want_file && has_object_pack(oid))
3749 return 0;
3750
3751 /*
3752 * Similarly, if we'd have to convert the file contents anyway, that
3753 * makes the optimization not worthwhile.
3754 */
3755 if (!want_file && would_convert_to_git(&the_index, name))
3756 return 0;
3757
3758 len = strlen(name);
3759 pos = cache_name_pos(name, len);
3760 if (pos < 0)
3761 return 0;
3762 ce = active_cache[pos];
3763
3764 /*
3765 * This is not the sha1 we are looking for, or
3766 * unreusable because it is not a regular file.
3767 */
3768 if (oidcmp(oid, &ce->oid) || !S_ISREG(ce->ce_mode))
3769 return 0;
3770
3771 /*
3772 * If ce is marked as "assume unchanged", there is no
3773 * guarantee that work tree matches what we are looking for.
3774 */
3775 if ((ce->ce_flags & CE_VALID) || ce_skip_worktree(ce))
3776 return 0;
3777
3778 /*
3779 * If ce matches the file in the work tree, we can reuse it.
3780 */
3781 if (ce_uptodate(ce) ||
3782 (!lstat(name, &st) && !ce_match_stat(ce, &st, 0)))
3783 return 1;
3784
3785 return 0;
3786 }
3787
3788 static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
3789 {
3790 struct strbuf buf = STRBUF_INIT;
3791 char *dirty = "";
3792
3793 /* Are we looking at the work tree? */
3794 if (s->dirty_submodule)
3795 dirty = "-dirty";
3796
3797 strbuf_addf(&buf, "Subproject commit %s%s\n",
3798 oid_to_hex(&s->oid), dirty);
3799 s->size = buf.len;
3800 if (size_only) {
3801 s->data = NULL;
3802 strbuf_release(&buf);
3803 } else {
3804 s->data = strbuf_detach(&buf, NULL);
3805 s->should_free = 1;
3806 }
3807 return 0;
3808 }
3809
3810 /*
3811 * While doing rename detection and pickaxe operation, we may need to
3812 * grab the data for the blob (or file) for our own in-core comparison.
3813 * diff_filespec has data and size fields for this purpose.
3814 */
3815 int diff_populate_filespec(struct diff_filespec *s, unsigned int flags)
3816 {
3817 int size_only = flags & CHECK_SIZE_ONLY;
3818 int err = 0;
3819 int conv_flags = global_conv_flags_eol;
3820 /*
3821 * demote FAIL to WARN to allow inspecting the situation
3822 * instead of refusing.
3823 */
3824 if (conv_flags & CONV_EOL_RNDTRP_DIE)
3825 conv_flags = CONV_EOL_RNDTRP_WARN;
3826
3827 if (!DIFF_FILE_VALID(s))
3828 die("internal error: asking to populate invalid file.");
3829 if (S_ISDIR(s->mode))
3830 return -1;
3831
3832 if (s->data)
3833 return 0;
3834
3835 if (size_only && 0 < s->size)
3836 return 0;
3837
3838 if (S_ISGITLINK(s->mode))
3839 return diff_populate_gitlink(s, size_only);
3840
3841 if (!s->oid_valid ||
3842 reuse_worktree_file(s->path, &s->oid, 0)) {
3843 struct strbuf buf = STRBUF_INIT;
3844 struct stat st;
3845 int fd;
3846
3847 if (lstat(s->path, &st) < 0) {
3848 err_empty:
3849 err = -1;
3850 empty:
3851 s->data = (char *)"";
3852 s->size = 0;
3853 return err;
3854 }
3855 s->size = xsize_t(st.st_size);
3856 if (!s->size)
3857 goto empty;
3858 if (S_ISLNK(st.st_mode)) {
3859 struct strbuf sb = STRBUF_INIT;
3860
3861 if (strbuf_readlink(&sb, s->path, s->size))
3862 goto err_empty;
3863 s->size = sb.len;
3864 s->data = strbuf_detach(&sb, NULL);
3865 s->should_free = 1;
3866 return 0;
3867 }
3868
3869 /*
3870 * Even if the caller would be happy with getting
3871 * only the size, we cannot return early at this
3872 * point if the path requires us to run the content
3873 * conversion.
3874 */
3875 if (size_only && !would_convert_to_git(&the_index, s->path))
3876 return 0;
3877
3878 /*
3879 * Note: this check uses xsize_t(st.st_size) that may
3880 * not be the true size of the blob after it goes
3881 * through convert_to_git(). This may not strictly be
3882 * correct, but the whole point of big_file_threshold
3883 * and is_binary check being that we want to avoid
3884 * opening the file and inspecting the contents, this
3885 * is probably fine.
3886 */
3887 if ((flags & CHECK_BINARY) &&
3888 s->size > big_file_threshold && s->is_binary == -1) {
3889 s->is_binary = 1;
3890 return 0;
3891 }
3892 fd = open(s->path, O_RDONLY);
3893 if (fd < 0)
3894 goto err_empty;
3895 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
3896 close(fd);
3897 s->should_munmap = 1;
3898
3899 /*
3900 * Convert from working tree format to canonical git format
3901 */
3902 if (convert_to_git(&the_index, s->path, s->data, s->size, &buf, conv_flags)) {
3903 size_t size = 0;
3904 munmap(s->data, s->size);
3905 s->should_munmap = 0;
3906 s->data = strbuf_detach(&buf, &size);
3907 s->size = size;
3908 s->should_free = 1;
3909 }
3910 }
3911 else {
3912 enum object_type type;
3913 if (size_only || (flags & CHECK_BINARY)) {
3914 type = oid_object_info(the_repository, &s->oid,
3915 &s->size);
3916 if (type < 0)
3917 die("unable to read %s",
3918 oid_to_hex(&s->oid));
3919 if (size_only)
3920 return 0;
3921 if (s->size > big_file_threshold && s->is_binary == -1) {
3922 s->is_binary = 1;
3923 return 0;
3924 }
3925 }
3926 s->data = read_object_file(&s->oid, &type, &s->size);
3927 if (!s->data)
3928 die("unable to read %s", oid_to_hex(&s->oid));
3929 s->should_free = 1;
3930 }
3931 return 0;
3932 }
3933
3934 void diff_free_filespec_blob(struct diff_filespec *s)
3935 {
3936 if (s->should_free)
3937 free(s->data);
3938 else if (s->should_munmap)
3939 munmap(s->data, s->size);
3940
3941 if (s->should_free || s->should_munmap) {
3942 s->should_free = s->should_munmap = 0;
3943 s->data = NULL;
3944 }
3945 }
3946
3947 void diff_free_filespec_data(struct diff_filespec *s)
3948 {
3949 diff_free_filespec_blob(s);
3950 FREE_AND_NULL(s->cnt_data);
3951 }
3952
3953 static void prep_temp_blob(const char *path, struct diff_tempfile *temp,
3954 void *blob,
3955 unsigned long size,
3956 const struct object_id *oid,
3957 int mode)
3958 {
3959 struct strbuf buf = STRBUF_INIT;
3960 struct strbuf tempfile = STRBUF_INIT;
3961 char *path_dup = xstrdup(path);
3962 const char *base = basename(path_dup);
3963
3964 /* Generate "XXXXXX_basename.ext" */
3965 strbuf_addstr(&tempfile, "XXXXXX_");
3966 strbuf_addstr(&tempfile, base);
3967
3968 temp->tempfile = mks_tempfile_ts(tempfile.buf, strlen(base) + 1);
3969 if (!temp->tempfile)
3970 die_errno("unable to create temp-file");
3971 if (convert_to_working_tree(&the_index, path,
3972 (const char *)blob, (size_t)size, &buf)) {
3973 blob = buf.buf;
3974 size = buf.len;
3975 }
3976 if (write_in_full(temp->tempfile->fd, blob, size) < 0 ||
3977 close_tempfile_gently(temp->tempfile))
3978 die_errno("unable to write temp-file");
3979 temp->name = get_tempfile_path(temp->tempfile);
3980 oid_to_hex_r(temp->hex, oid);
3981 xsnprintf(temp->mode, sizeof(temp->mode), "%06o", mode);
3982 strbuf_release(&buf);
3983 strbuf_release(&tempfile);
3984 free(path_dup);
3985 }
3986
3987 static struct diff_tempfile *prepare_temp_file(const char *name,
3988 struct diff_filespec *one)
3989 {
3990 struct diff_tempfile *temp = claim_diff_tempfile();
3991
3992 if (!DIFF_FILE_VALID(one)) {
3993 not_a_valid_file:
3994 /* A '-' entry produces this for file-2, and
3995 * a '+' entry produces this for file-1.
3996 */
3997 temp->name = "/dev/null";
3998 xsnprintf(temp->hex, sizeof(temp->hex), ".");
3999 xsnprintf(temp->mode, sizeof(temp->mode), ".");
4000 return temp;
4001 }
4002
4003 if (!S_ISGITLINK(one->mode) &&
4004 (!one->oid_valid ||
4005 reuse_worktree_file(name, &one->oid, 1))) {
4006 struct stat st;
4007 if (lstat(name, &st) < 0) {
4008 if (errno == ENOENT)
4009 goto not_a_valid_file;
4010 die_errno("stat(%s)", name);
4011 }
4012 if (S_ISLNK(st.st_mode)) {
4013 struct strbuf sb = STRBUF_INIT;
4014 if (strbuf_readlink(&sb, name, st.st_size) < 0)
4015 die_errno("readlink(%s)", name);
4016 prep_temp_blob(name, temp, sb.buf, sb.len,
4017 (one->oid_valid ?
4018 &one->oid : &null_oid),
4019 (one->oid_valid ?
4020 one->mode : S_IFLNK));
4021 strbuf_release(&sb);
4022 }
4023 else {
4024 /* we can borrow from the file in the work tree */
4025 temp->name = name;
4026 if (!one->oid_valid)
4027 oid_to_hex_r(temp->hex, &null_oid);
4028 else
4029 oid_to_hex_r(temp->hex, &one->oid);
4030 /* Even though we may sometimes borrow the
4031 * contents from the work tree, we always want
4032 * one->mode. mode is trustworthy even when
4033 * !(one->oid_valid), as long as
4034 * DIFF_FILE_VALID(one).
4035 */
4036 xsnprintf(temp->mode, sizeof(temp->mode), "%06o", one->mode);
4037 }
4038 return temp;
4039 }
4040 else {
4041 if (diff_populate_filespec(one, 0))
4042 die("cannot read data blob for %s", one->path);
4043 prep_temp_blob(name, temp, one->data, one->size,
4044 &one->oid, one->mode);
4045 }
4046 return temp;
4047 }
4048
4049 static void add_external_diff_name(struct argv_array *argv,
4050 const char *name,
4051 struct diff_filespec *df)
4052 {
4053 struct diff_tempfile *temp = prepare_temp_file(name, df);
4054 argv_array_push(argv, temp->name);
4055 argv_array_push(argv, temp->hex);
4056 argv_array_push(argv, temp->mode);
4057 }
4058
4059 /* An external diff command takes:
4060 *
4061 * diff-cmd name infile1 infile1-sha1 infile1-mode \
4062 * infile2 infile2-sha1 infile2-mode [ rename-to ]
4063 *
4064 */
4065 static void run_external_diff(const char *pgm,
4066 const char *name,
4067 const char *other,
4068 struct diff_filespec *one,
4069 struct diff_filespec *two,
4070 const char *xfrm_msg,
4071 int complete_rewrite,
4072 struct diff_options *o)
4073 {
4074 struct argv_array argv = ARGV_ARRAY_INIT;
4075 struct argv_array env = ARGV_ARRAY_INIT;
4076 struct diff_queue_struct *q = &diff_queued_diff;
4077
4078 argv_array_push(&argv, pgm);
4079 argv_array_push(&argv, name);
4080
4081 if (one && two) {
4082 add_external_diff_name(&argv, name, one);
4083 if (!other)
4084 add_external_diff_name(&argv, name, two);
4085 else {
4086 add_external_diff_name(&argv, other, two);
4087 argv_array_push(&argv, other);
4088 argv_array_push(&argv, xfrm_msg);
4089 }
4090 }
4091
4092 argv_array_pushf(&env, "GIT_DIFF_PATH_COUNTER=%d", ++o->diff_path_counter);
4093 argv_array_pushf(&env, "GIT_DIFF_PATH_TOTAL=%d", q->nr);
4094
4095 if (run_command_v_opt_cd_env(argv.argv, RUN_USING_SHELL, NULL, env.argv))
4096 die(_("external diff died, stopping at %s"), name);
4097
4098 remove_tempfile();
4099 argv_array_clear(&argv);
4100 argv_array_clear(&env);
4101 }
4102
4103 static int similarity_index(struct diff_filepair *p)
4104 {
4105 return p->score * 100 / MAX_SCORE;
4106 }
4107
4108 static const char *diff_abbrev_oid(const struct object_id *oid, int abbrev)
4109 {
4110 if (startup_info->have_repository)
4111 return find_unique_abbrev(oid, abbrev);
4112 else {
4113 char *hex = oid_to_hex(oid);
4114 if (abbrev < 0)
4115 abbrev = FALLBACK_DEFAULT_ABBREV;
4116 if (abbrev > the_hash_algo->hexsz)
4117 BUG("oid abbreviation out of range: %d", abbrev);
4118 if (abbrev)
4119 hex[abbrev] = '\0';
4120 return hex;
4121 }
4122 }
4123
4124 static void fill_metainfo(struct strbuf *msg,
4125 const char *name,
4126 const char *other,
4127 struct diff_filespec *one,
4128 struct diff_filespec *two,
4129 struct diff_options *o,
4130 struct diff_filepair *p,
4131 int *must_show_header,
4132 int use_color)
4133 {
4134 const char *set = diff_get_color(use_color, DIFF_METAINFO);
4135 const char *reset = diff_get_color(use_color, DIFF_RESET);
4136 const char *line_prefix = diff_line_prefix(o);
4137
4138 *must_show_header = 1;
4139 strbuf_init(msg, PATH_MAX * 2 + 300);
4140 switch (p->status) {
4141 case DIFF_STATUS_COPIED:
4142 strbuf_addf(msg, "%s%ssimilarity index %d%%",
4143 line_prefix, set, similarity_index(p));
4144 strbuf_addf(msg, "%s\n%s%scopy from ",
4145 reset, line_prefix, set);
4146 quote_c_style(name, msg, NULL, 0);
4147 strbuf_addf(msg, "%s\n%s%scopy to ", reset, line_prefix, set);
4148 quote_c_style(other, msg, NULL, 0);
4149 strbuf_addf(msg, "%s\n", reset);
4150 break;
4151 case DIFF_STATUS_RENAMED:
4152 strbuf_addf(msg, "%s%ssimilarity index %d%%",
4153 line_prefix, set, similarity_index(p));
4154 strbuf_addf(msg, "%s\n%s%srename from ",
4155 reset, line_prefix, set);
4156 quote_c_style(name, msg, NULL, 0);
4157 strbuf_addf(msg, "%s\n%s%srename to ",
4158 reset, line_prefix, set);
4159 quote_c_style(other, msg, NULL, 0);
4160 strbuf_addf(msg, "%s\n", reset);
4161 break;
4162 case DIFF_STATUS_MODIFIED:
4163 if (p->score) {
4164 strbuf_addf(msg, "%s%sdissimilarity index %d%%%s\n",
4165 line_prefix,
4166 set, similarity_index(p), reset);
4167 break;
4168 }
4169 /* fallthru */
4170 default:
4171 *must_show_header = 0;
4172 }
4173 if (one && two && oidcmp(&one->oid, &two->oid)) {
4174 const unsigned hexsz = the_hash_algo->hexsz;
4175 int abbrev = o->flags.full_index ? hexsz : DEFAULT_ABBREV;
4176
4177 if (o->flags.binary) {
4178 mmfile_t mf;
4179 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
4180 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
4181 abbrev = hexsz;
4182 }
4183 strbuf_addf(msg, "%s%sindex %s..%s", line_prefix, set,
4184 diff_abbrev_oid(&one->oid, abbrev),
4185 diff_abbrev_oid(&two->oid, abbrev));
4186 if (one->mode == two->mode)
4187 strbuf_addf(msg, " %06o", one->mode);
4188 strbuf_addf(msg, "%s\n", reset);
4189 }
4190 }
4191
4192 static void run_diff_cmd(const char *pgm,
4193 const char *name,
4194 const char *other,
4195 const char *attr_path,
4196 struct diff_filespec *one,
4197 struct diff_filespec *two,
4198 struct strbuf *msg,
4199 struct diff_options *o,
4200 struct diff_filepair *p)
4201 {
4202 const char *xfrm_msg = NULL;
4203 int complete_rewrite = (p->status == DIFF_STATUS_MODIFIED) && p->score;
4204 int must_show_header = 0;
4205
4206
4207 if (o->flags.allow_external) {
4208 struct userdiff_driver *drv = userdiff_find_by_path(attr_path);
4209 if (drv && drv->external)
4210 pgm = drv->external;
4211 }
4212
4213 if (msg) {
4214 /*
4215 * don't use colors when the header is intended for an
4216 * external diff driver
4217 */
4218 fill_metainfo(msg, name, other, one, two, o, p,
4219 &must_show_header,
4220 want_color(o->use_color) && !pgm);
4221 xfrm_msg = msg->len ? msg->buf : NULL;
4222 }
4223
4224 if (pgm) {
4225 run_external_diff(pgm, name, other, one, two, xfrm_msg,
4226 complete_rewrite, o);
4227 return;
4228 }
4229 if (one && two)
4230 builtin_diff(name, other ? other : name,
4231 one, two, xfrm_msg, must_show_header,
4232 o, complete_rewrite);
4233 else
4234 fprintf(o->file, "* Unmerged path %s\n", name);
4235 }
4236
4237 static void diff_fill_oid_info(struct diff_filespec *one)
4238 {
4239 if (DIFF_FILE_VALID(one)) {
4240 if (!one->oid_valid) {
4241 struct stat st;
4242 if (one->is_stdin) {
4243 oidclr(&one->oid);
4244 return;
4245 }
4246 if (lstat(one->path, &st) < 0)
4247 die_errno("stat '%s'", one->path);
4248 if (index_path(&one->oid, one->path, &st, 0))
4249 die("cannot hash %s", one->path);
4250 }
4251 }
4252 else
4253 oidclr(&one->oid);
4254 }
4255
4256 static void strip_prefix(int prefix_length, const char **namep, const char **otherp)
4257 {
4258 /* Strip the prefix but do not molest /dev/null and absolute paths */
4259 if (*namep && **namep != '/') {
4260 *namep += prefix_length;
4261 if (**namep == '/')
4262 ++*namep;
4263 }
4264 if (*otherp && **otherp != '/') {
4265 *otherp += prefix_length;
4266 if (**otherp == '/')
4267 ++*otherp;
4268 }
4269 }
4270
4271 static void run_diff(struct diff_filepair *p, struct diff_options *o)
4272 {
4273 const char *pgm = external_diff();
4274 struct strbuf msg;
4275 struct diff_filespec *one = p->one;
4276 struct diff_filespec *two = p->two;
4277 const char *name;
4278 const char *other;
4279 const char *attr_path;
4280
4281 name = one->path;
4282 other = (strcmp(name, two->path) ? two->path : NULL);
4283 attr_path = name;
4284 if (o->prefix_length)
4285 strip_prefix(o->prefix_length, &name, &other);
4286
4287 if (!o->flags.allow_external)
4288 pgm = NULL;
4289
4290 if (DIFF_PAIR_UNMERGED(p)) {
4291 run_diff_cmd(pgm, name, NULL, attr_path,
4292 NULL, NULL, NULL, o, p);
4293 return;
4294 }
4295
4296 diff_fill_oid_info(one);
4297 diff_fill_oid_info(two);
4298
4299 if (!pgm &&
4300 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
4301 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
4302 /*
4303 * a filepair that changes between file and symlink
4304 * needs to be split into deletion and creation.
4305 */
4306 struct diff_filespec *null = alloc_filespec(two->path);
4307 run_diff_cmd(NULL, name, other, attr_path,
4308 one, null, &msg, o, p);
4309 free(null);
4310 strbuf_release(&msg);
4311
4312 null = alloc_filespec(one->path);
4313 run_diff_cmd(NULL, name, other, attr_path,
4314 null, two, &msg, o, p);
4315 free(null);
4316 }
4317 else
4318 run_diff_cmd(pgm, name, other, attr_path,
4319 one, two, &msg, o, p);
4320
4321 strbuf_release(&msg);
4322 }
4323
4324 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
4325 struct diffstat_t *diffstat)
4326 {
4327 const char *name;
4328 const char *other;
4329
4330 if (DIFF_PAIR_UNMERGED(p)) {
4331 /* unmerged */
4332 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, p);
4333 return;
4334 }
4335
4336 name = p->one->path;
4337 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
4338
4339 if (o->prefix_length)
4340 strip_prefix(o->prefix_length, &name, &other);
4341
4342 diff_fill_oid_info(p->one);
4343 diff_fill_oid_info(p->two);
4344
4345 builtin_diffstat(name, other, p->one, p->two, diffstat, o, p);
4346 }
4347
4348 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
4349 {
4350 const char *name;
4351 const char *other;
4352 const char *attr_path;
4353
4354 if (DIFF_PAIR_UNMERGED(p)) {
4355 /* unmerged */
4356 return;
4357 }
4358
4359 name = p->one->path;
4360 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
4361 attr_path = other ? other : name;
4362
4363 if (o->prefix_length)
4364 strip_prefix(o->prefix_length, &name, &other);
4365
4366 diff_fill_oid_info(p->one);
4367 diff_fill_oid_info(p->two);
4368
4369 builtin_checkdiff(name, other, attr_path, p->one, p->two, o);
4370 }
4371
4372 void diff_setup(struct diff_options *options)
4373 {
4374 memcpy(options, &default_diff_options, sizeof(*options));
4375
4376 options->file = stdout;
4377
4378 options->abbrev = DEFAULT_ABBREV;
4379 options->line_termination = '\n';
4380 options->break_opt = -1;
4381 options->rename_limit = -1;
4382 options->dirstat_permille = diff_dirstat_permille_default;
4383 options->context = diff_context_default;
4384 options->interhunkcontext = diff_interhunk_context_default;
4385 options->ws_error_highlight = ws_error_highlight_default;
4386 options->flags.rename_empty = 1;
4387 options->objfind = NULL;
4388
4389 /* pathchange left =NULL by default */
4390 options->change = diff_change;
4391 options->add_remove = diff_addremove;
4392 options->use_color = diff_use_color_default;
4393 options->detect_rename = diff_detect_rename_default;
4394 options->xdl_opts |= diff_algorithm;
4395 if (diff_indent_heuristic)
4396 DIFF_XDL_SET(options, INDENT_HEURISTIC);
4397
4398 options->orderfile = diff_order_file_cfg;
4399
4400 if (diff_no_prefix) {
4401 options->a_prefix = options->b_prefix = "";
4402 } else if (!diff_mnemonic_prefix) {
4403 options->a_prefix = "a/";
4404 options->b_prefix = "b/";
4405 }
4406
4407 options->color_moved = diff_color_moved_default;
4408 options->color_moved_ws_handling = diff_color_moved_ws_default;
4409 }
4410
4411 void diff_setup_done(struct diff_options *options)
4412 {
4413 unsigned check_mask = DIFF_FORMAT_NAME |
4414 DIFF_FORMAT_NAME_STATUS |
4415 DIFF_FORMAT_CHECKDIFF |
4416 DIFF_FORMAT_NO_OUTPUT;
4417 /*
4418 * This must be signed because we're comparing against a potentially
4419 * negative value.
4420 */
4421 const int hexsz = the_hash_algo->hexsz;
4422
4423 if (options->set_default)
4424 options->set_default(options);
4425
4426 if (HAS_MULTI_BITS(options->output_format & check_mask))
4427 die(_("--name-only, --name-status, --check and -s are mutually exclusive"));
4428
4429 if (HAS_MULTI_BITS(options->pickaxe_opts & DIFF_PICKAXE_KINDS_MASK))
4430 die(_("-G, -S and --find-object are mutually exclusive"));
4431
4432 /*
4433 * Most of the time we can say "there are changes"
4434 * only by checking if there are changed paths, but
4435 * --ignore-whitespace* options force us to look
4436 * inside contents.
4437 */
4438
4439 if ((options->xdl_opts & XDF_WHITESPACE_FLAGS))
4440 options->flags.diff_from_contents = 1;
4441 else
4442 options->flags.diff_from_contents = 0;
4443
4444 if (options->flags.find_copies_harder)
4445 options->detect_rename = DIFF_DETECT_COPY;
4446
4447 if (!options->flags.relative_name)
4448 options->prefix = NULL;
4449 if (options->prefix)
4450 options->prefix_length = strlen(options->prefix);
4451 else
4452 options->prefix_length = 0;
4453
4454 if (options->output_format & (DIFF_FORMAT_NAME |
4455 DIFF_FORMAT_NAME_STATUS |
4456 DIFF_FORMAT_CHECKDIFF |
4457 DIFF_FORMAT_NO_OUTPUT))
4458 options->output_format &= ~(DIFF_FORMAT_RAW |
4459 DIFF_FORMAT_NUMSTAT |
4460 DIFF_FORMAT_DIFFSTAT |
4461 DIFF_FORMAT_SHORTSTAT |
4462 DIFF_FORMAT_DIRSTAT |
4463 DIFF_FORMAT_SUMMARY |
4464 DIFF_FORMAT_PATCH);
4465
4466 /*
4467 * These cases always need recursive; we do not drop caller-supplied
4468 * recursive bits for other formats here.
4469 */
4470 if (options->output_format & (DIFF_FORMAT_PATCH |
4471 DIFF_FORMAT_NUMSTAT |
4472 DIFF_FORMAT_DIFFSTAT |
4473 DIFF_FORMAT_SHORTSTAT |
4474 DIFF_FORMAT_DIRSTAT |
4475 DIFF_FORMAT_SUMMARY |
4476 DIFF_FORMAT_CHECKDIFF))
4477 options->flags.recursive = 1;
4478 /*
4479 * Also pickaxe would not work very well if you do not say recursive
4480 */
4481 if (options->pickaxe_opts & DIFF_PICKAXE_KINDS_MASK)
4482 options->flags.recursive = 1;
4483 /*
4484 * When patches are generated, submodules diffed against the work tree
4485 * must be checked for dirtiness too so it can be shown in the output
4486 */
4487 if (options->output_format & DIFF_FORMAT_PATCH)
4488 options->flags.dirty_submodules = 1;
4489
4490 if (options->detect_rename && options->rename_limit < 0)
4491 options->rename_limit = diff_rename_limit_default;
4492 if (hexsz < options->abbrev)
4493 options->abbrev = hexsz; /* full */
4494
4495 /*
4496 * It does not make sense to show the first hit we happened
4497 * to have found. It does not make sense not to return with
4498 * exit code in such a case either.
4499 */
4500 if (options->flags.quick) {
4501 options->output_format = DIFF_FORMAT_NO_OUTPUT;
4502 options->flags.exit_with_status = 1;
4503 }
4504
4505 options->diff_path_counter = 0;
4506
4507 if (options->flags.follow_renames && options->pathspec.nr != 1)
4508 die(_("--follow requires exactly one pathspec"));
4509
4510 if (!options->use_color || external_diff())
4511 options->color_moved = 0;
4512 }
4513
4514 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
4515 {
4516 char c, *eq;
4517 int len;
4518
4519 if (*arg != '-')
4520 return 0;
4521 c = *++arg;
4522 if (!c)
4523 return 0;
4524 if (c == arg_short) {
4525 c = *++arg;
4526 if (!c)
4527 return 1;
4528 if (val && isdigit(c)) {
4529 char *end;
4530 int n = strtoul(arg, &end, 10);
4531 if (*end)
4532 return 0;
4533 *val = n;
4534 return 1;
4535 }
4536 return 0;
4537 }
4538 if (c != '-')
4539 return 0;
4540 arg++;
4541 eq = strchrnul(arg, '=');
4542 len = eq - arg;
4543 if (!len || strncmp(arg, arg_long, len))
4544 return 0;
4545 if (*eq) {
4546 int n;
4547 char *end;
4548 if (!isdigit(*++eq))
4549 return 0;
4550 n = strtoul(eq, &end, 10);
4551 if (*end)
4552 return 0;
4553 *val = n;
4554 }
4555 return 1;
4556 }
4557
4558 static int diff_scoreopt_parse(const char *opt);
4559
4560 static inline int short_opt(char opt, const char **argv,
4561 const char **optarg)
4562 {
4563 const char *arg = argv[0];
4564 if (arg[0] != '-' || arg[1] != opt)
4565 return 0;
4566 if (arg[2] != '\0') {
4567 *optarg = arg + 2;
4568 return 1;
4569 }
4570 if (!argv[1])
4571 die("Option '%c' requires a value", opt);
4572 *optarg = argv[1];
4573 return 2;
4574 }
4575
4576 int parse_long_opt(const char *opt, const char **argv,
4577 const char **optarg)
4578 {
4579 const char *arg = argv[0];
4580 if (!skip_prefix(arg, "--", &arg))
4581 return 0;
4582 if (!skip_prefix(arg, opt, &arg))
4583 return 0;
4584 if (*arg == '=') { /* stuck form: --option=value */
4585 *optarg = arg + 1;
4586 return 1;
4587 }
4588 if (*arg != '\0')
4589 return 0;
4590 /* separate form: --option value */
4591 if (!argv[1])
4592 die("Option '--%s' requires a value", opt);
4593 *optarg = argv[1];
4594 return 2;
4595 }
4596
4597 static int stat_opt(struct diff_options *options, const char **av)
4598 {
4599 const char *arg = av[0];
4600 char *end;
4601 int width = options->stat_width;
4602 int name_width = options->stat_name_width;
4603 int graph_width = options->stat_graph_width;
4604 int count = options->stat_count;
4605 int argcount = 1;
4606
4607 if (!skip_prefix(arg, "--stat", &arg))
4608 BUG("stat option does not begin with --stat: %s", arg);
4609 end = (char *)arg;
4610
4611 switch (*arg) {
4612 case '-':
4613 if (skip_prefix(arg, "-width", &arg)) {
4614 if (*arg == '=')
4615 width = strtoul(arg + 1, &end, 10);
4616 else if (!*arg && !av[1])
4617 die_want_option("--stat-width");
4618 else if (!*arg) {
4619 width = strtoul(av[1], &end, 10);
4620 argcount = 2;
4621 }
4622 } else if (skip_prefix(arg, "-name-width", &arg)) {
4623 if (*arg == '=')
4624 name_width = strtoul(arg + 1, &end, 10);
4625 else if (!*arg && !av[1])
4626 die_want_option("--stat-name-width");
4627 else if (!*arg) {
4628 name_width = strtoul(av[1], &end, 10);
4629 argcount = 2;
4630 }
4631 } else if (skip_prefix(arg, "-graph-width", &arg)) {
4632 if (*arg == '=')
4633 graph_width = strtoul(arg + 1, &end, 10);
4634 else if (!*arg && !av[1])
4635 die_want_option("--stat-graph-width");
4636 else if (!*arg) {
4637 graph_width = strtoul(av[1], &end, 10);
4638 argcount = 2;
4639 }
4640 } else if (skip_prefix(arg, "-count", &arg)) {
4641 if (*arg == '=')
4642 count = strtoul(arg + 1, &end, 10);
4643 else if (!*arg && !av[1])
4644 die_want_option("--stat-count");
4645 else if (!*arg) {
4646 count = strtoul(av[1], &end, 10);
4647 argcount = 2;
4648 }
4649 }
4650 break;
4651 case '=':
4652 width = strtoul(arg+1, &end, 10);
4653 if (*end == ',')
4654 name_width = strtoul(end+1, &end, 10);
4655 if (*end == ',')
4656 count = strtoul(end+1, &end, 10);
4657 }
4658
4659 /* Important! This checks all the error cases! */
4660 if (*end)
4661 return 0;
4662 options->output_format |= DIFF_FORMAT_DIFFSTAT;
4663 options->stat_name_width = name_width;
4664 options->stat_graph_width = graph_width;
4665 options->stat_width = width;
4666 options->stat_count = count;
4667 return argcount;
4668 }
4669
4670 static int parse_dirstat_opt(struct diff_options *options, const char *params)
4671 {
4672 struct strbuf errmsg = STRBUF_INIT;
4673 if (parse_dirstat_params(options, params, &errmsg))
4674 die(_("Failed to parse --dirstat/-X option parameter:\n%s"),
4675 errmsg.buf);
4676 strbuf_release(&errmsg);
4677 /*
4678 * The caller knows a dirstat-related option is given from the command
4679 * line; allow it to say "return this_function();"
4680 */
4681 options->output_format |= DIFF_FORMAT_DIRSTAT;
4682 return 1;
4683 }
4684
4685 static int parse_submodule_opt(struct diff_options *options, const char *value)
4686 {
4687 if (parse_submodule_params(options, value))
4688 die(_("Failed to parse --submodule option parameter: '%s'"),
4689 value);
4690 return 1;
4691 }
4692
4693 static const char diff_status_letters[] = {
4694 DIFF_STATUS_ADDED,
4695 DIFF_STATUS_COPIED,
4696 DIFF_STATUS_DELETED,
4697 DIFF_STATUS_MODIFIED,
4698 DIFF_STATUS_RENAMED,
4699 DIFF_STATUS_TYPE_CHANGED,
4700 DIFF_STATUS_UNKNOWN,
4701 DIFF_STATUS_UNMERGED,
4702 DIFF_STATUS_FILTER_AON,
4703 DIFF_STATUS_FILTER_BROKEN,
4704 '\0',
4705 };
4706
4707 static unsigned int filter_bit['Z' + 1];
4708
4709 static void prepare_filter_bits(void)
4710 {
4711 int i;
4712
4713 if (!filter_bit[DIFF_STATUS_ADDED]) {
4714 for (i = 0; diff_status_letters[i]; i++)
4715 filter_bit[(int) diff_status_letters[i]] = (1 << i);
4716 }
4717 }
4718
4719 static unsigned filter_bit_tst(char status, const struct diff_options *opt)
4720 {
4721 return opt->filter & filter_bit[(int) status];
4722 }
4723
4724 static int parse_diff_filter_opt(const char *optarg, struct diff_options *opt)
4725 {
4726 int i, optch;
4727
4728 prepare_filter_bits();
4729
4730 /*
4731 * If there is a negation e.g. 'd' in the input, and we haven't
4732 * initialized the filter field with another --diff-filter, start
4733 * from full set of bits, except for AON.
4734 */
4735 if (!opt->filter) {
4736 for (i = 0; (optch = optarg[i]) != '\0'; i++) {
4737 if (optch < 'a' || 'z' < optch)
4738 continue;
4739 opt->filter = (1 << (ARRAY_SIZE(diff_status_letters) - 1)) - 1;
4740 opt->filter &= ~filter_bit[DIFF_STATUS_FILTER_AON];
4741 break;
4742 }
4743 }
4744
4745 for (i = 0; (optch = optarg[i]) != '\0'; i++) {
4746 unsigned int bit;
4747 int negate;
4748
4749 if ('a' <= optch && optch <= 'z') {
4750 negate = 1;
4751 optch = toupper(optch);
4752 } else {
4753 negate = 0;
4754 }
4755
4756 bit = (0 <= optch && optch <= 'Z') ? filter_bit[optch] : 0;
4757 if (!bit)
4758 return optarg[i];
4759 if (negate)
4760 opt->filter &= ~bit;
4761 else
4762 opt->filter |= bit;
4763 }
4764 return 0;
4765 }
4766
4767 static void enable_patch_output(int *fmt) {
4768 *fmt &= ~DIFF_FORMAT_NO_OUTPUT;
4769 *fmt |= DIFF_FORMAT_PATCH;
4770 }
4771
4772 static int parse_ws_error_highlight_opt(struct diff_options *opt, const char *arg)
4773 {
4774 int val = parse_ws_error_highlight(arg);
4775
4776 if (val < 0) {
4777 error("unknown value after ws-error-highlight=%.*s",
4778 -1 - val, arg);
4779 return 0;
4780 }
4781 opt->ws_error_highlight = val;
4782 return 1;
4783 }
4784
4785 static int parse_objfind_opt(struct diff_options *opt, const char *arg)
4786 {
4787 struct object_id oid;
4788
4789 if (get_oid(arg, &oid))
4790 return error("unable to resolve '%s'", arg);
4791
4792 if (!opt->objfind)
4793 opt->objfind = xcalloc(1, sizeof(*opt->objfind));
4794
4795 opt->pickaxe_opts |= DIFF_PICKAXE_KIND_OBJFIND;
4796 opt->flags.recursive = 1;
4797 opt->flags.tree_in_recursive = 1;
4798 oidset_insert(opt->objfind, &oid);
4799 return 1;
4800 }
4801
4802 int diff_opt_parse(struct diff_options *options,
4803 const char **av, int ac, const char *prefix)
4804 {
4805 const char *arg = av[0];
4806 const char *optarg;
4807 int argcount;
4808
4809 if (!prefix)
4810 prefix = "";
4811
4812 /* Output format options */
4813 if (!strcmp(arg, "-p") || !strcmp(arg, "-u") || !strcmp(arg, "--patch")
4814 || opt_arg(arg, 'U', "unified", &options->context))
4815 enable_patch_output(&options->output_format);
4816 else if (!strcmp(arg, "--raw"))
4817 options->output_format |= DIFF_FORMAT_RAW;
4818 else if (!strcmp(arg, "--patch-with-raw")) {
4819 enable_patch_output(&options->output_format);
4820 options->output_format |= DIFF_FORMAT_RAW;
4821 } else if (!strcmp(arg, "--numstat"))
4822 options->output_format |= DIFF_FORMAT_NUMSTAT;
4823 else if (!strcmp(arg, "--shortstat"))
4824 options->output_format |= DIFF_FORMAT_SHORTSTAT;
4825 else if (skip_prefix(arg, "-X", &arg) ||
4826 skip_to_optional_arg(arg, "--dirstat", &arg))
4827 return parse_dirstat_opt(options, arg);
4828 else if (!strcmp(arg, "--cumulative"))
4829 return parse_dirstat_opt(options, "cumulative");
4830 else if (skip_to_optional_arg(arg, "--dirstat-by-file", &arg)) {
4831 parse_dirstat_opt(options, "files");
4832 return parse_dirstat_opt(options, arg);
4833 }
4834 else if (!strcmp(arg, "--check"))
4835 options->output_format |= DIFF_FORMAT_CHECKDIFF;
4836 else if (!strcmp(arg, "--summary"))
4837 options->output_format |= DIFF_FORMAT_SUMMARY;
4838 else if (!strcmp(arg, "--patch-with-stat")) {
4839 enable_patch_output(&options->output_format);
4840 options->output_format |= DIFF_FORMAT_DIFFSTAT;
4841 } else if (!strcmp(arg, "--name-only"))
4842 options->output_format |= DIFF_FORMAT_NAME;
4843 else if (!strcmp(arg, "--name-status"))
4844 options->output_format |= DIFF_FORMAT_NAME_STATUS;
4845 else if (!strcmp(arg, "-s") || !strcmp(arg, "--no-patch"))
4846 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
4847 else if (starts_with(arg, "--stat"))
4848 /* --stat, --stat-width, --stat-name-width, or --stat-count */
4849 return stat_opt(options, av);
4850 else if (!strcmp(arg, "--compact-summary")) {
4851 options->flags.stat_with_summary = 1;
4852 options->output_format |= DIFF_FORMAT_DIFFSTAT;
4853 } else if (!strcmp(arg, "--no-compact-summary"))
4854 options->flags.stat_with_summary = 0;
4855
4856 /* renames options */
4857 else if (starts_with(arg, "-B") ||
4858 skip_to_optional_arg(arg, "--break-rewrites", NULL)) {
4859 if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
4860 return error("invalid argument to -B: %s", arg+2);
4861 }
4862 else if (starts_with(arg, "-M") ||
4863 skip_to_optional_arg(arg, "--find-renames", NULL)) {
4864 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
4865 return error("invalid argument to -M: %s", arg+2);
4866 options->detect_rename = DIFF_DETECT_RENAME;
4867 }
4868 else if (!strcmp(arg, "-D") || !strcmp(arg, "--irreversible-delete")) {
4869 options->irreversible_delete = 1;
4870 }
4871 else if (starts_with(arg, "-C") ||
4872 skip_to_optional_arg(arg, "--find-copies", NULL)) {
4873 if (options->detect_rename == DIFF_DETECT_COPY)
4874 options->flags.find_copies_harder = 1;
4875 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
4876 return error("invalid argument to -C: %s", arg+2);
4877 options->detect_rename = DIFF_DETECT_COPY;
4878 }
4879 else if (!strcmp(arg, "--no-renames"))
4880 options->detect_rename = 0;
4881 else if (!strcmp(arg, "--rename-empty"))
4882 options->flags.rename_empty = 1;
4883 else if (!strcmp(arg, "--no-rename-empty"))
4884 options->flags.rename_empty = 0;
4885 else if (skip_to_optional_arg_default(arg, "--relative", &arg, NULL)) {
4886 options->flags.relative_name = 1;
4887 if (arg)
4888 options->prefix = arg;
4889 }
4890
4891 /* xdiff options */
4892 else if (!strcmp(arg, "--minimal"))
4893 DIFF_XDL_SET(options, NEED_MINIMAL);
4894 else if (!strcmp(arg, "--no-minimal"))
4895 DIFF_XDL_CLR(options, NEED_MINIMAL);
4896 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
4897 DIFF_XDL_SET(options, IGNORE_WHITESPACE);
4898 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
4899 DIFF_XDL_SET(options, IGNORE_WHITESPACE_CHANGE);
4900 else if (!strcmp(arg, "--ignore-space-at-eol"))
4901 DIFF_XDL_SET(options, IGNORE_WHITESPACE_AT_EOL);
4902 else if (!strcmp(arg, "--ignore-cr-at-eol"))
4903 DIFF_XDL_SET(options, IGNORE_CR_AT_EOL);
4904 else if (!strcmp(arg, "--ignore-blank-lines"))
4905 DIFF_XDL_SET(options, IGNORE_BLANK_LINES);
4906 else if (!strcmp(arg, "--indent-heuristic"))
4907 DIFF_XDL_SET(options, INDENT_HEURISTIC);
4908 else if (!strcmp(arg, "--no-indent-heuristic"))
4909 DIFF_XDL_CLR(options, INDENT_HEURISTIC);
4910 else if (!strcmp(arg, "--patience")) {
4911 int i;
4912 options->xdl_opts = DIFF_WITH_ALG(options, PATIENCE_DIFF);
4913 /*
4914 * Both --patience and --anchored use PATIENCE_DIFF
4915 * internally, so remove any anchors previously
4916 * specified.
4917 */
4918 for (i = 0; i < options->anchors_nr; i++)
4919 free(options->anchors[i]);
4920 options->anchors_nr = 0;
4921 } else if (!strcmp(arg, "--histogram"))
4922 options->xdl_opts = DIFF_WITH_ALG(options, HISTOGRAM_DIFF);
4923 else if ((argcount = parse_long_opt("diff-algorithm", av, &optarg))) {
4924 long value = parse_algorithm_value(optarg);
4925 if (value < 0)
4926 return error("option diff-algorithm accepts \"myers\", "
4927 "\"minimal\", \"patience\" and \"histogram\"");
4928 /* clear out previous settings */
4929 DIFF_XDL_CLR(options, NEED_MINIMAL);
4930 options->xdl_opts &= ~XDF_DIFF_ALGORITHM_MASK;
4931 options->xdl_opts |= value;
4932 return argcount;
4933 } else if (skip_prefix(arg, "--anchored=", &arg)) {
4934 options->xdl_opts = DIFF_WITH_ALG(options, PATIENCE_DIFF);
4935 ALLOC_GROW(options->anchors, options->anchors_nr + 1,
4936 options->anchors_alloc);
4937 options->anchors[options->anchors_nr++] = xstrdup(arg);
4938 }
4939
4940 /* flags options */
4941 else if (!strcmp(arg, "--binary")) {
4942 enable_patch_output(&options->output_format);
4943 options->flags.binary = 1;
4944 }
4945 else if (!strcmp(arg, "--full-index"))
4946 options->flags.full_index = 1;
4947 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
4948 options->flags.text = 1;
4949 else if (!strcmp(arg, "-R"))
4950 options->flags.reverse_diff = 1;
4951 else if (!strcmp(arg, "--find-copies-harder"))
4952 options->flags.find_copies_harder = 1;
4953 else if (!strcmp(arg, "--follow"))
4954 options->flags.follow_renames = 1;
4955 else if (!strcmp(arg, "--no-follow")) {
4956 options->flags.follow_renames = 0;
4957 options->flags.default_follow_renames = 0;
4958 } else if (skip_to_optional_arg_default(arg, "--color", &arg, "always")) {
4959 int value = git_config_colorbool(NULL, arg);
4960 if (value < 0)
4961 return error("option `color' expects \"always\", \"auto\", or \"never\"");
4962 options->use_color = value;
4963 }
4964 else if (!strcmp(arg, "--no-color"))
4965 options->use_color = 0;
4966 else if (!strcmp(arg, "--color-moved")) {
4967 if (diff_color_moved_default)
4968 options->color_moved = diff_color_moved_default;
4969 if (options->color_moved == COLOR_MOVED_NO)
4970 options->color_moved = COLOR_MOVED_DEFAULT;
4971 } else if (!strcmp(arg, "--no-color-moved"))
4972 options->color_moved = COLOR_MOVED_NO;
4973 else if (skip_prefix(arg, "--color-moved=", &arg)) {
4974 int cm = parse_color_moved(arg);
4975 if (cm < 0)
4976 die("bad --color-moved argument: %s", arg);
4977 options->color_moved = cm;
4978 } else if (skip_prefix(arg, "--color-moved-ws=", &arg)) {
4979 options->color_moved_ws_handling = parse_color_moved_ws(arg);
4980 } else if (skip_to_optional_arg_default(arg, "--color-words", &options->word_regex, NULL)) {
4981 options->use_color = 1;
4982 options->word_diff = DIFF_WORDS_COLOR;
4983 }
4984 else if (!strcmp(arg, "--word-diff")) {
4985 if (options->word_diff == DIFF_WORDS_NONE)
4986 options->word_diff = DIFF_WORDS_PLAIN;
4987 }
4988 else if (skip_prefix(arg, "--word-diff=", &arg)) {
4989 if (!strcmp(arg, "plain"))
4990 options->word_diff = DIFF_WORDS_PLAIN;
4991 else if (!strcmp(arg, "color")) {
4992 options->use_color = 1;
4993 options->word_diff = DIFF_WORDS_COLOR;
4994 }
4995 else if (!strcmp(arg, "porcelain"))
4996 options->word_diff = DIFF_WORDS_PORCELAIN;
4997 else if (!strcmp(arg, "none"))
4998 options->word_diff = DIFF_WORDS_NONE;
4999 else
5000 die("bad --word-diff argument: %s", arg);
5001 }
5002 else if ((argcount = parse_long_opt("word-diff-regex", av, &optarg))) {
5003 if (options->word_diff == DIFF_WORDS_NONE)
5004 options->word_diff = DIFF_WORDS_PLAIN;
5005 options->word_regex = optarg;
5006 return argcount;
5007 }
5008 else if (!strcmp(arg, "--exit-code"))
5009 options->flags.exit_with_status = 1;
5010 else if (!strcmp(arg, "--quiet"))
5011 options->flags.quick = 1;
5012 else if (!strcmp(arg, "--ext-diff"))
5013 options->flags.allow_external = 1;
5014 else if (!strcmp(arg, "--no-ext-diff"))
5015 options->flags.allow_external = 0;
5016 else if (!strcmp(arg, "--textconv")) {
5017 options->flags.allow_textconv = 1;
5018 options->flags.textconv_set_via_cmdline = 1;
5019 } else if (!strcmp(arg, "--no-textconv"))
5020 options->flags.allow_textconv = 0;
5021 else if (skip_to_optional_arg_default(arg, "--ignore-submodules", &arg, "all")) {
5022 options->flags.override_submodule_config = 1;
5023 handle_ignore_submodules_arg(options, arg);
5024 } else if (skip_to_optional_arg_default(arg, "--submodule", &arg, "log"))
5025 return parse_submodule_opt(options, arg);
5026 else if (skip_prefix(arg, "--ws-error-highlight=", &arg))
5027 return parse_ws_error_highlight_opt(options, arg);
5028 else if (!strcmp(arg, "--ita-invisible-in-index"))
5029 options->ita_invisible_in_index = 1;
5030 else if (!strcmp(arg, "--ita-visible-in-index"))
5031 options->ita_invisible_in_index = 0;
5032
5033 /* misc options */
5034 else if (!strcmp(arg, "-z"))
5035 options->line_termination = 0;
5036 else if ((argcount = short_opt('l', av, &optarg))) {
5037 options->rename_limit = strtoul(optarg, NULL, 10);
5038 return argcount;
5039 }
5040 else if ((argcount = short_opt('S', av, &optarg))) {
5041 options->pickaxe = optarg;
5042 options->pickaxe_opts |= DIFF_PICKAXE_KIND_S;
5043 return argcount;
5044 } else if ((argcount = short_opt('G', av, &optarg))) {
5045 options->pickaxe = optarg;
5046 options->pickaxe_opts |= DIFF_PICKAXE_KIND_G;
5047 return argcount;
5048 }
5049 else if (!strcmp(arg, "--pickaxe-all"))
5050 options->pickaxe_opts |= DIFF_PICKAXE_ALL;
5051 else if (!strcmp(arg, "--pickaxe-regex"))
5052 options->pickaxe_opts |= DIFF_PICKAXE_REGEX;
5053 else if ((argcount = short_opt('O', av, &optarg))) {
5054 options->orderfile = prefix_filename(prefix, optarg);
5055 return argcount;
5056 } else if (skip_prefix(arg, "--find-object=", &arg))
5057 return parse_objfind_opt(options, arg);
5058 else if ((argcount = parse_long_opt("diff-filter", av, &optarg))) {
5059 int offending = parse_diff_filter_opt(optarg, options);
5060 if (offending)
5061 die("unknown change class '%c' in --diff-filter=%s",
5062 offending, optarg);
5063 return argcount;
5064 }
5065 else if (!strcmp(arg, "--no-abbrev"))
5066 options->abbrev = 0;
5067 else if (!strcmp(arg, "--abbrev"))
5068 options->abbrev = DEFAULT_ABBREV;
5069 else if (skip_prefix(arg, "--abbrev=", &arg)) {
5070 options->abbrev = strtoul(arg, NULL, 10);
5071 if (options->abbrev < MINIMUM_ABBREV)
5072 options->abbrev = MINIMUM_ABBREV;
5073 else if (the_hash_algo->hexsz < options->abbrev)
5074 options->abbrev = the_hash_algo->hexsz;
5075 }
5076 else if ((argcount = parse_long_opt("src-prefix", av, &optarg))) {
5077 options->a_prefix = optarg;
5078 return argcount;
5079 }
5080 else if ((argcount = parse_long_opt("line-prefix", av, &optarg))) {
5081 options->line_prefix = optarg;
5082 options->line_prefix_length = strlen(options->line_prefix);
5083 graph_setup_line_prefix(options);
5084 return argcount;
5085 }
5086 else if ((argcount = parse_long_opt("dst-prefix", av, &optarg))) {
5087 options->b_prefix = optarg;
5088 return argcount;
5089 }
5090 else if (!strcmp(arg, "--no-prefix"))
5091 options->a_prefix = options->b_prefix = "";
5092 else if (opt_arg(arg, '\0', "inter-hunk-context",
5093 &options->interhunkcontext))
5094 ;
5095 else if (!strcmp(arg, "-W"))
5096 options->flags.funccontext = 1;
5097 else if (!strcmp(arg, "--function-context"))
5098 options->flags.funccontext = 1;
5099 else if (!strcmp(arg, "--no-function-context"))
5100 options->flags.funccontext = 0;
5101 else if ((argcount = parse_long_opt("output", av, &optarg))) {
5102 char *path = prefix_filename(prefix, optarg);
5103 options->file = xfopen(path, "w");
5104 options->close_file = 1;
5105 if (options->use_color != GIT_COLOR_ALWAYS)
5106 options->use_color = GIT_COLOR_NEVER;
5107 free(path);
5108 return argcount;
5109 } else
5110 return 0;
5111 return 1;
5112 }
5113
5114 int parse_rename_score(const char **cp_p)
5115 {
5116 unsigned long num, scale;
5117 int ch, dot;
5118 const char *cp = *cp_p;
5119
5120 num = 0;
5121 scale = 1;
5122 dot = 0;
5123 for (;;) {
5124 ch = *cp;
5125 if ( !dot && ch == '.' ) {
5126 scale = 1;
5127 dot = 1;
5128 } else if ( ch == '%' ) {
5129 scale = dot ? scale*100 : 100;
5130 cp++; /* % is always at the end */
5131 break;
5132 } else if ( ch >= '0' && ch <= '9' ) {
5133 if ( scale < 100000 ) {
5134 scale *= 10;
5135 num = (num*10) + (ch-'0');
5136 }
5137 } else {
5138 break;
5139 }
5140 cp++;
5141 }
5142 *cp_p = cp;
5143
5144 /* user says num divided by scale and we say internally that
5145 * is MAX_SCORE * num / scale.
5146 */
5147 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
5148 }
5149
5150 static int diff_scoreopt_parse(const char *opt)
5151 {
5152 int opt1, opt2, cmd;
5153
5154 if (*opt++ != '-')
5155 return -1;
5156 cmd = *opt++;
5157 if (cmd == '-') {
5158 /* convert the long-form arguments into short-form versions */
5159 if (skip_prefix(opt, "break-rewrites", &opt)) {
5160 if (*opt == 0 || *opt++ == '=')
5161 cmd = 'B';
5162 } else if (skip_prefix(opt, "find-copies", &opt)) {
5163 if (*opt == 0 || *opt++ == '=')
5164 cmd = 'C';
5165 } else if (skip_prefix(opt, "find-renames", &opt)) {
5166 if (*opt == 0 || *opt++ == '=')
5167 cmd = 'M';
5168 }
5169 }
5170 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
5171 return -1; /* that is not a -M, -C, or -B option */
5172
5173 opt1 = parse_rename_score(&opt);
5174 if (cmd != 'B')
5175 opt2 = 0;
5176 else {
5177 if (*opt == 0)
5178 opt2 = 0;
5179 else if (*opt != '/')
5180 return -1; /* we expect -B80/99 or -B80 */
5181 else {
5182 opt++;
5183 opt2 = parse_rename_score(&opt);
5184 }
5185 }
5186 if (*opt != 0)
5187 return -1;
5188 return opt1 | (opt2 << 16);
5189 }
5190
5191 struct diff_queue_struct diff_queued_diff;
5192
5193 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
5194 {
5195 ALLOC_GROW(queue->queue, queue->nr + 1, queue->alloc);
5196 queue->queue[queue->nr++] = dp;
5197 }
5198
5199 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
5200 struct diff_filespec *one,
5201 struct diff_filespec *two)
5202 {
5203 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
5204 dp->one = one;
5205 dp->two = two;
5206 if (queue)
5207 diff_q(queue, dp);
5208 return dp;
5209 }
5210
5211 void diff_free_filepair(struct diff_filepair *p)
5212 {
5213 free_filespec(p->one);
5214 free_filespec(p->two);
5215 free(p);
5216 }
5217
5218 const char *diff_aligned_abbrev(const struct object_id *oid, int len)
5219 {
5220 int abblen;
5221 const char *abbrev;
5222
5223 /* Do we want all 40 hex characters? */
5224 if (len == the_hash_algo->hexsz)
5225 return oid_to_hex(oid);
5226
5227 /* An abbreviated value is fine, possibly followed by an ellipsis. */
5228 abbrev = diff_abbrev_oid(oid, len);
5229
5230 if (!print_sha1_ellipsis())
5231 return abbrev;
5232
5233 abblen = strlen(abbrev);
5234
5235 /*
5236 * In well-behaved cases, where the abbreviated result is the
5237 * same as the requested length, append three dots after the
5238 * abbreviation (hence the whole logic is limited to the case
5239 * where abblen < 37); when the actual abbreviated result is a
5240 * bit longer than the requested length, we reduce the number
5241 * of dots so that they match the well-behaved ones. However,
5242 * if the actual abbreviation is longer than the requested
5243 * length by more than three, we give up on aligning, and add
5244 * three dots anyway, to indicate that the output is not the
5245 * full object name. Yes, this may be suboptimal, but this
5246 * appears only in "diff --raw --abbrev" output and it is not
5247 * worth the effort to change it now. Note that this would
5248 * likely to work fine when the automatic sizing of default
5249 * abbreviation length is used--we would be fed -1 in "len" in
5250 * that case, and will end up always appending three-dots, but
5251 * the automatic sizing is supposed to give abblen that ensures
5252 * uniqueness across all objects (statistically speaking).
5253 */
5254 if (abblen < the_hash_algo->hexsz - 3) {
5255 static char hex[GIT_MAX_HEXSZ + 1];
5256 if (len < abblen && abblen <= len + 2)
5257 xsnprintf(hex, sizeof(hex), "%s%.*s", abbrev, len+3-abblen, "..");
5258 else
5259 xsnprintf(hex, sizeof(hex), "%s...", abbrev);
5260 return hex;
5261 }
5262
5263 return oid_to_hex(oid);
5264 }
5265
5266 static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
5267 {
5268 int line_termination = opt->line_termination;
5269 int inter_name_termination = line_termination ? '\t' : '\0';
5270
5271 fprintf(opt->file, "%s", diff_line_prefix(opt));
5272 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
5273 fprintf(opt->file, ":%06o %06o %s ", p->one->mode, p->two->mode,
5274 diff_aligned_abbrev(&p->one->oid, opt->abbrev));
5275 fprintf(opt->file, "%s ",
5276 diff_aligned_abbrev(&p->two->oid, opt->abbrev));
5277 }
5278 if (p->score) {
5279 fprintf(opt->file, "%c%03d%c", p->status, similarity_index(p),
5280 inter_name_termination);
5281 } else {
5282 fprintf(opt->file, "%c%c", p->status, inter_name_termination);
5283 }
5284
5285 if (p->status == DIFF_STATUS_COPIED ||
5286 p->status == DIFF_STATUS_RENAMED) {
5287 const char *name_a, *name_b;
5288 name_a = p->one->path;
5289 name_b = p->two->path;
5290 strip_prefix(opt->prefix_length, &name_a, &name_b);
5291 write_name_quoted(name_a, opt->file, inter_name_termination);
5292 write_name_quoted(name_b, opt->file, line_termination);
5293 } else {
5294 const char *name_a, *name_b;
5295 name_a = p->one->mode ? p->one->path : p->two->path;
5296 name_b = NULL;
5297 strip_prefix(opt->prefix_length, &name_a, &name_b);
5298 write_name_quoted(name_a, opt->file, line_termination);
5299 }
5300 }
5301
5302 int diff_unmodified_pair(struct diff_filepair *p)
5303 {
5304 /* This function is written stricter than necessary to support
5305 * the currently implemented transformers, but the idea is to
5306 * let transformers to produce diff_filepairs any way they want,
5307 * and filter and clean them up here before producing the output.
5308 */
5309 struct diff_filespec *one = p->one, *two = p->two;
5310
5311 if (DIFF_PAIR_UNMERGED(p))
5312 return 0; /* unmerged is interesting */
5313
5314 /* deletion, addition, mode or type change
5315 * and rename are all interesting.
5316 */
5317 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
5318 DIFF_PAIR_MODE_CHANGED(p) ||
5319 strcmp(one->path, two->path))
5320 return 0;
5321
5322 /* both are valid and point at the same path. that is, we are
5323 * dealing with a change.
5324 */
5325 if (one->oid_valid && two->oid_valid &&
5326 !oidcmp(&one->oid, &two->oid) &&
5327 !one->dirty_submodule && !two->dirty_submodule)
5328 return 1; /* no change */
5329 if (!one->oid_valid && !two->oid_valid)
5330 return 1; /* both look at the same file on the filesystem. */
5331 return 0;
5332 }
5333
5334 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
5335 {
5336 if (diff_unmodified_pair(p))
5337 return;
5338
5339 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
5340 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
5341 return; /* no tree diffs in patch format */
5342
5343 run_diff(p, o);
5344 }
5345
5346 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
5347 struct diffstat_t *diffstat)
5348 {
5349 if (diff_unmodified_pair(p))
5350 return;
5351
5352 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
5353 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
5354 return; /* no useful stat for tree diffs */
5355
5356 run_diffstat(p, o, diffstat);
5357 }
5358
5359 static void diff_flush_checkdiff(struct diff_filepair *p,
5360 struct diff_options *o)
5361 {
5362 if (diff_unmodified_pair(p))
5363 return;
5364
5365 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
5366 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
5367 return; /* nothing to check in tree diffs */
5368
5369 run_checkdiff(p, o);
5370 }
5371
5372 int diff_queue_is_empty(void)
5373 {
5374 struct diff_queue_struct *q = &diff_queued_diff;
5375 int i;
5376 for (i = 0; i < q->nr; i++)
5377 if (!diff_unmodified_pair(q->queue[i]))
5378 return 0;
5379 return 1;
5380 }
5381
5382 #if DIFF_DEBUG
5383 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
5384 {
5385 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
5386 x, one ? one : "",
5387 s->path,
5388 DIFF_FILE_VALID(s) ? "valid" : "invalid",
5389 s->mode,
5390 s->oid_valid ? oid_to_hex(&s->oid) : "");
5391 fprintf(stderr, "queue[%d] %s size %lu\n",
5392 x, one ? one : "",
5393 s->size);
5394 }
5395
5396 void diff_debug_filepair(const struct diff_filepair *p, int i)
5397 {
5398 diff_debug_filespec(p->one, i, "one");
5399 diff_debug_filespec(p->two, i, "two");
5400 fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
5401 p->score, p->status ? p->status : '?',
5402 p->one->rename_used, p->broken_pair);
5403 }
5404
5405 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
5406 {
5407 int i;
5408 if (msg)
5409 fprintf(stderr, "%s\n", msg);
5410 fprintf(stderr, "q->nr = %d\n", q->nr);
5411 for (i = 0; i < q->nr; i++) {
5412 struct diff_filepair *p = q->queue[i];
5413 diff_debug_filepair(p, i);
5414 }
5415 }
5416 #endif
5417
5418 static void diff_resolve_rename_copy(void)
5419 {
5420 int i;
5421 struct diff_filepair *p;
5422 struct diff_queue_struct *q = &diff_queued_diff;
5423
5424 diff_debug_queue("resolve-rename-copy", q);
5425
5426 for (i = 0; i < q->nr; i++) {
5427 p = q->queue[i];
5428 p->status = 0; /* undecided */
5429 if (DIFF_PAIR_UNMERGED(p))
5430 p->status = DIFF_STATUS_UNMERGED;
5431 else if (!DIFF_FILE_VALID(p->one))
5432 p->status = DIFF_STATUS_ADDED;
5433 else if (!DIFF_FILE_VALID(p->two))
5434 p->status = DIFF_STATUS_DELETED;
5435 else if (DIFF_PAIR_TYPE_CHANGED(p))
5436 p->status = DIFF_STATUS_TYPE_CHANGED;
5437
5438 /* from this point on, we are dealing with a pair
5439 * whose both sides are valid and of the same type, i.e.
5440 * either in-place edit or rename/copy edit.
5441 */
5442 else if (DIFF_PAIR_RENAME(p)) {
5443 /*
5444 * A rename might have re-connected a broken
5445 * pair up, causing the pathnames to be the
5446 * same again. If so, that's not a rename at
5447 * all, just a modification..
5448 *
5449 * Otherwise, see if this source was used for
5450 * multiple renames, in which case we decrement
5451 * the count, and call it a copy.
5452 */
5453 if (!strcmp(p->one->path, p->two->path))
5454 p->status = DIFF_STATUS_MODIFIED;
5455 else if (--p->one->rename_used > 0)
5456 p->status = DIFF_STATUS_COPIED;
5457 else
5458 p->status = DIFF_STATUS_RENAMED;
5459 }
5460 else if (oidcmp(&p->one->oid, &p->two->oid) ||
5461 p->one->mode != p->two->mode ||
5462 p->one->dirty_submodule ||
5463 p->two->dirty_submodule ||
5464 is_null_oid(&p->one->oid))
5465 p->status = DIFF_STATUS_MODIFIED;
5466 else {
5467 /* This is a "no-change" entry and should not
5468 * happen anymore, but prepare for broken callers.
5469 */
5470 error("feeding unmodified %s to diffcore",
5471 p->one->path);
5472 p->status = DIFF_STATUS_UNKNOWN;
5473 }
5474 }
5475 diff_debug_queue("resolve-rename-copy done", q);
5476 }
5477
5478 static int check_pair_status(struct diff_filepair *p)
5479 {
5480 switch (p->status) {
5481 case DIFF_STATUS_UNKNOWN:
5482 return 0;
5483 case 0:
5484 die("internal error in diff-resolve-rename-copy");
5485 default:
5486 return 1;
5487 }
5488 }
5489
5490 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
5491 {
5492 int fmt = opt->output_format;
5493
5494 if (fmt & DIFF_FORMAT_CHECKDIFF)
5495 diff_flush_checkdiff(p, opt);
5496 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
5497 diff_flush_raw(p, opt);
5498 else if (fmt & DIFF_FORMAT_NAME) {
5499 const char *name_a, *name_b;
5500 name_a = p->two->path;
5501 name_b = NULL;
5502 strip_prefix(opt->prefix_length, &name_a, &name_b);
5503 fprintf(opt->file, "%s", diff_line_prefix(opt));
5504 write_name_quoted(name_a, opt->file, opt->line_termination);
5505 }
5506 }
5507
5508 static void show_file_mode_name(struct diff_options *opt, const char *newdelete, struct diff_filespec *fs)
5509 {
5510 struct strbuf sb = STRBUF_INIT;
5511 if (fs->mode)
5512 strbuf_addf(&sb, " %s mode %06o ", newdelete, fs->mode);
5513 else
5514 strbuf_addf(&sb, " %s ", newdelete);
5515
5516 quote_c_style(fs->path, &sb, NULL, 0);
5517 strbuf_addch(&sb, '\n');
5518 emit_diff_symbol(opt, DIFF_SYMBOL_SUMMARY,
5519 sb.buf, sb.len, 0);
5520 strbuf_release(&sb);
5521 }
5522
5523 static void show_mode_change(struct diff_options *opt, struct diff_filepair *p,
5524 int show_name)
5525 {
5526 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
5527 struct strbuf sb = STRBUF_INIT;
5528 strbuf_addf(&sb, " mode change %06o => %06o",
5529 p->one->mode, p->two->mode);
5530 if (show_name) {
5531 strbuf_addch(&sb, ' ');
5532 quote_c_style(p->two->path, &sb, NULL, 0);
5533 }
5534 strbuf_addch(&sb, '\n');
5535 emit_diff_symbol(opt, DIFF_SYMBOL_SUMMARY,
5536 sb.buf, sb.len, 0);
5537 strbuf_release(&sb);
5538 }
5539 }
5540
5541 static void show_rename_copy(struct diff_options *opt, const char *renamecopy,
5542 struct diff_filepair *p)
5543 {
5544 struct strbuf sb = STRBUF_INIT;
5545 struct strbuf names = STRBUF_INIT;
5546
5547 pprint_rename(&names, p->one->path, p->two->path);
5548 strbuf_addf(&sb, " %s %s (%d%%)\n",
5549 renamecopy, names.buf, similarity_index(p));
5550 strbuf_release(&names);
5551 emit_diff_symbol(opt, DIFF_SYMBOL_SUMMARY,
5552 sb.buf, sb.len, 0);
5553 show_mode_change(opt, p, 0);
5554 strbuf_release(&sb);
5555 }
5556
5557 static void diff_summary(struct diff_options *opt, struct diff_filepair *p)
5558 {
5559 switch(p->status) {
5560 case DIFF_STATUS_DELETED:
5561 show_file_mode_name(opt, "delete", p->one);
5562 break;
5563 case DIFF_STATUS_ADDED:
5564 show_file_mode_name(opt, "create", p->two);
5565 break;
5566 case DIFF_STATUS_COPIED:
5567 show_rename_copy(opt, "copy", p);
5568 break;
5569 case DIFF_STATUS_RENAMED:
5570 show_rename_copy(opt, "rename", p);
5571 break;
5572 default:
5573 if (p->score) {
5574 struct strbuf sb = STRBUF_INIT;
5575 strbuf_addstr(&sb, " rewrite ");
5576 quote_c_style(p->two->path, &sb, NULL, 0);
5577 strbuf_addf(&sb, " (%d%%)\n", similarity_index(p));
5578 emit_diff_symbol(opt, DIFF_SYMBOL_SUMMARY,
5579 sb.buf, sb.len, 0);
5580 strbuf_release(&sb);
5581 }
5582 show_mode_change(opt, p, !p->score);
5583 break;
5584 }
5585 }
5586
5587 struct patch_id_t {
5588 git_SHA_CTX *ctx;
5589 int patchlen;
5590 };
5591
5592 static int remove_space(char *line, int len)
5593 {
5594 int i;
5595 char *dst = line;
5596 unsigned char c;
5597
5598 for (i = 0; i < len; i++)
5599 if (!isspace((c = line[i])))
5600 *dst++ = c;
5601
5602 return dst - line;
5603 }
5604
5605 static void patch_id_consume(void *priv, char *line, unsigned long len)
5606 {
5607 struct patch_id_t *data = priv;
5608 int new_len;
5609
5610 /* Ignore line numbers when computing the SHA1 of the patch */
5611 if (starts_with(line, "@@ -"))
5612 return;
5613
5614 new_len = remove_space(line, len);
5615
5616 git_SHA1_Update(data->ctx, line, new_len);
5617 data->patchlen += new_len;
5618 }
5619
5620 static void patch_id_add_string(git_SHA_CTX *ctx, const char *str)
5621 {
5622 git_SHA1_Update(ctx, str, strlen(str));
5623 }
5624
5625 static void patch_id_add_mode(git_SHA_CTX *ctx, unsigned mode)
5626 {
5627 /* large enough for 2^32 in octal */
5628 char buf[12];
5629 int len = xsnprintf(buf, sizeof(buf), "%06o", mode);
5630 git_SHA1_Update(ctx, buf, len);
5631 }
5632
5633 /* returns 0 upon success, and writes result into sha1 */
5634 static int diff_get_patch_id(struct diff_options *options, struct object_id *oid, int diff_header_only)
5635 {
5636 struct diff_queue_struct *q = &diff_queued_diff;
5637 int i;
5638 git_SHA_CTX ctx;
5639 struct patch_id_t data;
5640
5641 git_SHA1_Init(&ctx);
5642 memset(&data, 0, sizeof(struct patch_id_t));
5643 data.ctx = &ctx;
5644
5645 for (i = 0; i < q->nr; i++) {
5646 xpparam_t xpp;
5647 xdemitconf_t xecfg;
5648 mmfile_t mf1, mf2;
5649 struct diff_filepair *p = q->queue[i];
5650 int len1, len2;
5651
5652 memset(&xpp, 0, sizeof(xpp));
5653 memset(&xecfg, 0, sizeof(xecfg));
5654 if (p->status == 0)
5655 return error("internal diff status error");
5656 if (p->status == DIFF_STATUS_UNKNOWN)
5657 continue;
5658 if (diff_unmodified_pair(p))
5659 continue;
5660 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
5661 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
5662 continue;
5663 if (DIFF_PAIR_UNMERGED(p))
5664 continue;
5665
5666 diff_fill_oid_info(p->one);
5667 diff_fill_oid_info(p->two);
5668
5669 len1 = remove_space(p->one->path, strlen(p->one->path));
5670 len2 = remove_space(p->two->path, strlen(p->two->path));
5671 patch_id_add_string(&ctx, "diff--git");
5672 patch_id_add_string(&ctx, "a/");
5673 git_SHA1_Update(&ctx, p->one->path, len1);
5674 patch_id_add_string(&ctx, "b/");
5675 git_SHA1_Update(&ctx, p->two->path, len2);
5676
5677 if (p->one->mode == 0) {
5678 patch_id_add_string(&ctx, "newfilemode");
5679 patch_id_add_mode(&ctx, p->two->mode);
5680 patch_id_add_string(&ctx, "---/dev/null");
5681 patch_id_add_string(&ctx, "+++b/");
5682 git_SHA1_Update(&ctx, p->two->path, len2);
5683 } else if (p->two->mode == 0) {
5684 patch_id_add_string(&ctx, "deletedfilemode");
5685 patch_id_add_mode(&ctx, p->one->mode);
5686 patch_id_add_string(&ctx, "---a/");
5687 git_SHA1_Update(&ctx, p->one->path, len1);
5688 patch_id_add_string(&ctx, "+++/dev/null");
5689 } else {
5690 patch_id_add_string(&ctx, "---a/");
5691 git_SHA1_Update(&ctx, p->one->path, len1);
5692 patch_id_add_string(&ctx, "+++b/");
5693 git_SHA1_Update(&ctx, p->two->path, len2);
5694 }
5695
5696 if (diff_header_only)
5697 continue;
5698
5699 if (fill_mmfile(&mf1, p->one) < 0 ||
5700 fill_mmfile(&mf2, p->two) < 0)
5701 return error("unable to read files to diff");
5702
5703 if (diff_filespec_is_binary(p->one) ||
5704 diff_filespec_is_binary(p->two)) {
5705 git_SHA1_Update(&ctx, oid_to_hex(&p->one->oid),
5706 GIT_SHA1_HEXSZ);
5707 git_SHA1_Update(&ctx, oid_to_hex(&p->two->oid),
5708 GIT_SHA1_HEXSZ);
5709 continue;
5710 }
5711
5712 xpp.flags = 0;
5713 xecfg.ctxlen = 3;
5714 xecfg.flags = 0;
5715 if (xdi_diff_outf(&mf1, &mf2, patch_id_consume, &data,
5716 &xpp, &xecfg))
5717 return error("unable to generate patch-id diff for %s",
5718 p->one->path);
5719 }
5720
5721 git_SHA1_Final(oid->hash, &ctx);
5722 return 0;
5723 }
5724
5725 int diff_flush_patch_id(struct diff_options *options, struct object_id *oid, int diff_header_only)
5726 {
5727 struct diff_queue_struct *q = &diff_queued_diff;
5728 int i;
5729 int result = diff_get_patch_id(options, oid, diff_header_only);
5730
5731 for (i = 0; i < q->nr; i++)
5732 diff_free_filepair(q->queue[i]);
5733
5734 free(q->queue);
5735 DIFF_QUEUE_CLEAR(q);
5736
5737 return result;
5738 }
5739
5740 static int is_summary_empty(const struct diff_queue_struct *q)
5741 {
5742 int i;
5743
5744 for (i = 0; i < q->nr; i++) {
5745 const struct diff_filepair *p = q->queue[i];
5746
5747 switch (p->status) {
5748 case DIFF_STATUS_DELETED:
5749 case DIFF_STATUS_ADDED:
5750 case DIFF_STATUS_COPIED:
5751 case DIFF_STATUS_RENAMED:
5752 return 0;
5753 default:
5754 if (p->score)
5755 return 0;
5756 if (p->one->mode && p->two->mode &&
5757 p->one->mode != p->two->mode)
5758 return 0;
5759 break;
5760 }
5761 }
5762 return 1;
5763 }
5764
5765 static const char rename_limit_warning[] =
5766 N_("inexact rename detection was skipped due to too many files.");
5767
5768 static const char degrade_cc_to_c_warning[] =
5769 N_("only found copies from modified paths due to too many files.");
5770
5771 static const char rename_limit_advice[] =
5772 N_("you may want to set your %s variable to at least "
5773 "%d and retry the command.");
5774
5775 void diff_warn_rename_limit(const char *varname, int needed, int degraded_cc)
5776 {
5777 fflush(stdout);
5778 if (degraded_cc)
5779 warning(_(degrade_cc_to_c_warning));
5780 else if (needed)
5781 warning(_(rename_limit_warning));
5782 else
5783 return;
5784 if (0 < needed)
5785 warning(_(rename_limit_advice), varname, needed);
5786 }
5787
5788 static void diff_flush_patch_all_file_pairs(struct diff_options *o)
5789 {
5790 int i;
5791 static struct emitted_diff_symbols esm = EMITTED_DIFF_SYMBOLS_INIT;
5792 struct diff_queue_struct *q = &diff_queued_diff;
5793
5794 if (WSEH_NEW & WS_RULE_MASK)
5795 BUG("WS rules bit mask overlaps with diff symbol flags");
5796
5797 if (o->color_moved)
5798 o->emitted_symbols = &esm;
5799
5800 for (i = 0; i < q->nr; i++) {
5801 struct diff_filepair *p = q->queue[i];
5802 if (check_pair_status(p))
5803 diff_flush_patch(p, o);
5804 }
5805
5806 if (o->emitted_symbols) {
5807 if (o->color_moved) {
5808 struct hashmap add_lines, del_lines;
5809
5810 if (o->color_moved_ws_handling &
5811 COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE)
5812 o->color_moved_ws_handling |= XDF_IGNORE_WHITESPACE;
5813
5814 hashmap_init(&del_lines, moved_entry_cmp, o, 0);
5815 hashmap_init(&add_lines, moved_entry_cmp, o, 0);
5816
5817 add_lines_to_move_detection(o, &add_lines, &del_lines);
5818 mark_color_as_moved(o, &add_lines, &del_lines);
5819 if (o->color_moved == COLOR_MOVED_ZEBRA_DIM)
5820 dim_moved_lines(o);
5821
5822 hashmap_free(&add_lines, 0);
5823 hashmap_free(&del_lines, 0);
5824 }
5825
5826 for (i = 0; i < esm.nr; i++)
5827 emit_diff_symbol_from_struct(o, &esm.buf[i]);
5828
5829 for (i = 0; i < esm.nr; i++)
5830 free((void *)esm.buf[i].line);
5831 }
5832 esm.nr = 0;
5833 }
5834
5835 void diff_flush(struct diff_options *options)
5836 {
5837 struct diff_queue_struct *q = &diff_queued_diff;
5838 int i, output_format = options->output_format;
5839 int separator = 0;
5840 int dirstat_by_line = 0;
5841
5842 /*
5843 * Order: raw, stat, summary, patch
5844 * or: name/name-status/checkdiff (other bits clear)
5845 */
5846 if (!q->nr)
5847 goto free_queue;
5848
5849 if (output_format & (DIFF_FORMAT_RAW |
5850 DIFF_FORMAT_NAME |
5851 DIFF_FORMAT_NAME_STATUS |
5852 DIFF_FORMAT_CHECKDIFF)) {
5853 for (i = 0; i < q->nr; i++) {
5854 struct diff_filepair *p = q->queue[i];
5855 if (check_pair_status(p))
5856 flush_one_pair(p, options);
5857 }
5858 separator++;
5859 }
5860
5861 if (output_format & DIFF_FORMAT_DIRSTAT && options->flags.dirstat_by_line)
5862 dirstat_by_line = 1;
5863
5864 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT) ||
5865 dirstat_by_line) {
5866 struct diffstat_t diffstat;
5867
5868 memset(&diffstat, 0, sizeof(struct diffstat_t));
5869 for (i = 0; i < q->nr; i++) {
5870 struct diff_filepair *p = q->queue[i];
5871 if (check_pair_status(p))
5872 diff_flush_stat(p, options, &diffstat);
5873 }
5874 if (output_format & DIFF_FORMAT_NUMSTAT)
5875 show_numstat(&diffstat, options);
5876 if (output_format & DIFF_FORMAT_DIFFSTAT)
5877 show_stats(&diffstat, options);
5878 if (output_format & DIFF_FORMAT_SHORTSTAT)
5879 show_shortstats(&diffstat, options);
5880 if (output_format & DIFF_FORMAT_DIRSTAT && dirstat_by_line)
5881 show_dirstat_by_line(&diffstat, options);
5882 free_diffstat_info(&diffstat);
5883 separator++;
5884 }
5885 if ((output_format & DIFF_FORMAT_DIRSTAT) && !dirstat_by_line)
5886 show_dirstat(options);
5887
5888 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
5889 for (i = 0; i < q->nr; i++) {
5890 diff_summary(options, q->queue[i]);
5891 }
5892 separator++;
5893 }
5894
5895 if (output_format & DIFF_FORMAT_NO_OUTPUT &&
5896 options->flags.exit_with_status &&
5897 options->flags.diff_from_contents) {
5898 /*
5899 * run diff_flush_patch for the exit status. setting
5900 * options->file to /dev/null should be safe, because we
5901 * aren't supposed to produce any output anyway.
5902 */
5903 if (options->close_file)
5904 fclose(options->file);
5905 options->file = xfopen("/dev/null", "w");
5906 options->close_file = 1;
5907 options->color_moved = 0;
5908 for (i = 0; i < q->nr; i++) {
5909 struct diff_filepair *p = q->queue[i];
5910 if (check_pair_status(p))
5911 diff_flush_patch(p, options);
5912 if (options->found_changes)
5913 break;
5914 }
5915 }
5916
5917 if (output_format & DIFF_FORMAT_PATCH) {
5918 if (separator) {
5919 emit_diff_symbol(options, DIFF_SYMBOL_SEPARATOR, NULL, 0, 0);
5920 if (options->stat_sep)
5921 /* attach patch instead of inline */
5922 emit_diff_symbol(options, DIFF_SYMBOL_STAT_SEP,
5923 NULL, 0, 0);
5924 }
5925
5926 diff_flush_patch_all_file_pairs(options);
5927 }
5928
5929 if (output_format & DIFF_FORMAT_CALLBACK)
5930 options->format_callback(q, options, options->format_callback_data);
5931
5932 for (i = 0; i < q->nr; i++)
5933 diff_free_filepair(q->queue[i]);
5934 free_queue:
5935 free(q->queue);
5936 DIFF_QUEUE_CLEAR(q);
5937 if (options->close_file)
5938 fclose(options->file);
5939
5940 /*
5941 * Report the content-level differences with HAS_CHANGES;
5942 * diff_addremove/diff_change does not set the bit when
5943 * DIFF_FROM_CONTENTS is in effect (e.g. with -w).
5944 */
5945 if (options->flags.diff_from_contents) {
5946 if (options->found_changes)
5947 options->flags.has_changes = 1;
5948 else
5949 options->flags.has_changes = 0;
5950 }
5951 }
5952
5953 static int match_filter(const struct diff_options *options, const struct diff_filepair *p)
5954 {
5955 return (((p->status == DIFF_STATUS_MODIFIED) &&
5956 ((p->score &&
5957 filter_bit_tst(DIFF_STATUS_FILTER_BROKEN, options)) ||
5958 (!p->score &&
5959 filter_bit_tst(DIFF_STATUS_MODIFIED, options)))) ||
5960 ((p->status != DIFF_STATUS_MODIFIED) &&
5961 filter_bit_tst(p->status, options)));
5962 }
5963
5964 static void diffcore_apply_filter(struct diff_options *options)
5965 {
5966 int i;
5967 struct diff_queue_struct *q = &diff_queued_diff;
5968 struct diff_queue_struct outq;
5969
5970 DIFF_QUEUE_CLEAR(&outq);
5971
5972 if (!options->filter)
5973 return;
5974
5975 if (filter_bit_tst(DIFF_STATUS_FILTER_AON, options)) {
5976 int found;
5977 for (i = found = 0; !found && i < q->nr; i++) {
5978 if (match_filter(options, q->queue[i]))
5979 found++;
5980 }
5981 if (found)
5982 return;
5983
5984 /* otherwise we will clear the whole queue
5985 * by copying the empty outq at the end of this
5986 * function, but first clear the current entries
5987 * in the queue.
5988 */
5989 for (i = 0; i < q->nr; i++)
5990 diff_free_filepair(q->queue[i]);
5991 }
5992 else {
5993 /* Only the matching ones */
5994 for (i = 0; i < q->nr; i++) {
5995 struct diff_filepair *p = q->queue[i];
5996 if (match_filter(options, p))
5997 diff_q(&outq, p);
5998 else
5999 diff_free_filepair(p);
6000 }
6001 }
6002 free(q->queue);
6003 *q = outq;
6004 }
6005
6006 /* Check whether two filespecs with the same mode and size are identical */
6007 static int diff_filespec_is_identical(struct diff_filespec *one,
6008 struct diff_filespec *two)
6009 {
6010 if (S_ISGITLINK(one->mode))
6011 return 0;
6012 if (diff_populate_filespec(one, 0))
6013 return 0;
6014 if (diff_populate_filespec(two, 0))
6015 return 0;
6016 return !memcmp(one->data, two->data, one->size);
6017 }
6018
6019 static int diff_filespec_check_stat_unmatch(struct diff_filepair *p)
6020 {
6021 if (p->done_skip_stat_unmatch)
6022 return p->skip_stat_unmatch_result;
6023
6024 p->done_skip_stat_unmatch = 1;
6025 p->skip_stat_unmatch_result = 0;
6026 /*
6027 * 1. Entries that come from stat info dirtiness
6028 * always have both sides (iow, not create/delete),
6029 * one side of the object name is unknown, with
6030 * the same mode and size. Keep the ones that
6031 * do not match these criteria. They have real
6032 * differences.
6033 *
6034 * 2. At this point, the file is known to be modified,
6035 * with the same mode and size, and the object
6036 * name of one side is unknown. Need to inspect
6037 * the identical contents.
6038 */
6039 if (!DIFF_FILE_VALID(p->one) || /* (1) */
6040 !DIFF_FILE_VALID(p->two) ||
6041 (p->one->oid_valid && p->two->oid_valid) ||
6042 (p->one->mode != p->two->mode) ||
6043 diff_populate_filespec(p->one, CHECK_SIZE_ONLY) ||
6044 diff_populate_filespec(p->two, CHECK_SIZE_ONLY) ||
6045 (p->one->size != p->two->size) ||
6046 !diff_filespec_is_identical(p->one, p->two)) /* (2) */
6047 p->skip_stat_unmatch_result = 1;
6048 return p->skip_stat_unmatch_result;
6049 }
6050
6051 static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
6052 {
6053 int i;
6054 struct diff_queue_struct *q = &diff_queued_diff;
6055 struct diff_queue_struct outq;
6056 DIFF_QUEUE_CLEAR(&outq);
6057
6058 for (i = 0; i < q->nr; i++) {
6059 struct diff_filepair *p = q->queue[i];
6060
6061 if (diff_filespec_check_stat_unmatch(p))
6062 diff_q(&outq, p);
6063 else {
6064 /*
6065 * The caller can subtract 1 from skip_stat_unmatch
6066 * to determine how many paths were dirty only
6067 * due to stat info mismatch.
6068 */
6069 if (!diffopt->flags.no_index)
6070 diffopt->skip_stat_unmatch++;
6071 diff_free_filepair(p);
6072 }
6073 }
6074 free(q->queue);
6075 *q = outq;
6076 }
6077
6078 static int diffnamecmp(const void *a_, const void *b_)
6079 {
6080 const struct diff_filepair *a = *((const struct diff_filepair **)a_);
6081 const struct diff_filepair *b = *((const struct diff_filepair **)b_);
6082 const char *name_a, *name_b;
6083
6084 name_a = a->one ? a->one->path : a->two->path;
6085 name_b = b->one ? b->one->path : b->two->path;
6086 return strcmp(name_a, name_b);
6087 }
6088
6089 void diffcore_fix_diff_index(struct diff_options *options)
6090 {
6091 struct diff_queue_struct *q = &diff_queued_diff;
6092 QSORT(q->queue, q->nr, diffnamecmp);
6093 }
6094
6095 void diffcore_std(struct diff_options *options)
6096 {
6097 /* NOTE please keep the following in sync with diff_tree_combined() */
6098 if (options->skip_stat_unmatch)
6099 diffcore_skip_stat_unmatch(options);
6100 if (!options->found_follow) {
6101 /* See try_to_follow_renames() in tree-diff.c */
6102 if (options->break_opt != -1)
6103 diffcore_break(options->break_opt);
6104 if (options->detect_rename)
6105 diffcore_rename(options);
6106 if (options->break_opt != -1)
6107 diffcore_merge_broken();
6108 }
6109 if (options->pickaxe_opts & DIFF_PICKAXE_KINDS_MASK)
6110 diffcore_pickaxe(options);
6111 if (options->orderfile)
6112 diffcore_order(options->orderfile);
6113 if (!options->found_follow)
6114 /* See try_to_follow_renames() in tree-diff.c */
6115 diff_resolve_rename_copy();
6116 diffcore_apply_filter(options);
6117
6118 if (diff_queued_diff.nr && !options->flags.diff_from_contents)
6119 options->flags.has_changes = 1;
6120 else
6121 options->flags.has_changes = 0;
6122
6123 options->found_follow = 0;
6124 }
6125
6126 int diff_result_code(struct diff_options *opt, int status)
6127 {
6128 int result = 0;
6129
6130 diff_warn_rename_limit("diff.renameLimit",
6131 opt->needed_rename_limit,
6132 opt->degraded_cc_to_c);
6133 if (!opt->flags.exit_with_status &&
6134 !(opt->output_format & DIFF_FORMAT_CHECKDIFF))
6135 return status;
6136 if (opt->flags.exit_with_status &&
6137 opt->flags.has_changes)
6138 result |= 01;
6139 if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) &&
6140 opt->flags.check_failed)
6141 result |= 02;
6142 return result;
6143 }
6144
6145 int diff_can_quit_early(struct diff_options *opt)
6146 {
6147 return (opt->flags.quick &&
6148 !opt->filter &&
6149 opt->flags.has_changes);
6150 }
6151
6152 /*
6153 * Shall changes to this submodule be ignored?
6154 *
6155 * Submodule changes can be configured to be ignored separately for each path,
6156 * but that configuration can be overridden from the command line.
6157 */
6158 static int is_submodule_ignored(const char *path, struct diff_options *options)
6159 {
6160 int ignored = 0;
6161 struct diff_flags orig_flags = options->flags;
6162 if (!options->flags.override_submodule_config)
6163 set_diffopt_flags_from_submodule_config(options, path);
6164 if (options->flags.ignore_submodules)
6165 ignored = 1;
6166 options->flags = orig_flags;
6167 return ignored;
6168 }
6169
6170 void diff_addremove(struct diff_options *options,
6171 int addremove, unsigned mode,
6172 const struct object_id *oid,
6173 int oid_valid,
6174 const char *concatpath, unsigned dirty_submodule)
6175 {
6176 struct diff_filespec *one, *two;
6177
6178 if (S_ISGITLINK(mode) && is_submodule_ignored(concatpath, options))
6179 return;
6180
6181 /* This may look odd, but it is a preparation for
6182 * feeding "there are unchanged files which should
6183 * not produce diffs, but when you are doing copy
6184 * detection you would need them, so here they are"
6185 * entries to the diff-core. They will be prefixed
6186 * with something like '=' or '*' (I haven't decided
6187 * which but should not make any difference).
6188 * Feeding the same new and old to diff_change()
6189 * also has the same effect.
6190 * Before the final output happens, they are pruned after
6191 * merged into rename/copy pairs as appropriate.
6192 */
6193 if (options->flags.reverse_diff)
6194 addremove = (addremove == '+' ? '-' :
6195 addremove == '-' ? '+' : addremove);
6196
6197 if (options->prefix &&
6198 strncmp(concatpath, options->prefix, options->prefix_length))
6199 return;
6200
6201 one = alloc_filespec(concatpath);
6202 two = alloc_filespec(concatpath);
6203
6204 if (addremove != '+')
6205 fill_filespec(one, oid, oid_valid, mode);
6206 if (addremove != '-') {
6207 fill_filespec(two, oid, oid_valid, mode);
6208 two->dirty_submodule = dirty_submodule;
6209 }
6210
6211 diff_queue(&diff_queued_diff, one, two);
6212 if (!options->flags.diff_from_contents)
6213 options->flags.has_changes = 1;
6214 }
6215
6216 void diff_change(struct diff_options *options,
6217 unsigned old_mode, unsigned new_mode,
6218 const struct object_id *old_oid,
6219 const struct object_id *new_oid,
6220 int old_oid_valid, int new_oid_valid,
6221 const char *concatpath,
6222 unsigned old_dirty_submodule, unsigned new_dirty_submodule)
6223 {
6224 struct diff_filespec *one, *two;
6225 struct diff_filepair *p;
6226
6227 if (S_ISGITLINK(old_mode) && S_ISGITLINK(new_mode) &&
6228 is_submodule_ignored(concatpath, options))
6229 return;
6230
6231 if (options->flags.reverse_diff) {
6232 SWAP(old_mode, new_mode);
6233 SWAP(old_oid, new_oid);
6234 SWAP(old_oid_valid, new_oid_valid);
6235 SWAP(old_dirty_submodule, new_dirty_submodule);
6236 }
6237
6238 if (options->prefix &&
6239 strncmp(concatpath, options->prefix, options->prefix_length))
6240 return;
6241
6242 one = alloc_filespec(concatpath);
6243 two = alloc_filespec(concatpath);
6244 fill_filespec(one, old_oid, old_oid_valid, old_mode);
6245 fill_filespec(two, new_oid, new_oid_valid, new_mode);
6246 one->dirty_submodule = old_dirty_submodule;
6247 two->dirty_submodule = new_dirty_submodule;
6248 p = diff_queue(&diff_queued_diff, one, two);
6249
6250 if (options->flags.diff_from_contents)
6251 return;
6252
6253 if (options->flags.quick && options->skip_stat_unmatch &&
6254 !diff_filespec_check_stat_unmatch(p))
6255 return;
6256
6257 options->flags.has_changes = 1;
6258 }
6259
6260 struct diff_filepair *diff_unmerge(struct diff_options *options, const char *path)
6261 {
6262 struct diff_filepair *pair;
6263 struct diff_filespec *one, *two;
6264
6265 if (options->prefix &&
6266 strncmp(path, options->prefix, options->prefix_length))
6267 return NULL;
6268
6269 one = alloc_filespec(path);
6270 two = alloc_filespec(path);
6271 pair = diff_queue(&diff_queued_diff, one, two);
6272 pair->is_unmerged = 1;
6273 return pair;
6274 }
6275
6276 static char *run_textconv(const char *pgm, struct diff_filespec *spec,
6277 size_t *outsize)
6278 {
6279 struct diff_tempfile *temp;
6280 const char *argv[3];
6281 const char **arg = argv;
6282 struct child_process child = CHILD_PROCESS_INIT;
6283 struct strbuf buf = STRBUF_INIT;
6284 int err = 0;
6285
6286 temp = prepare_temp_file(spec->path, spec);
6287 *arg++ = pgm;
6288 *arg++ = temp->name;
6289 *arg = NULL;
6290
6291 child.use_shell = 1;
6292 child.argv = argv;
6293 child.out = -1;
6294 if (start_command(&child)) {
6295 remove_tempfile();
6296 return NULL;
6297 }
6298
6299 if (strbuf_read(&buf, child.out, 0) < 0)
6300 err = error("error reading from textconv command '%s'", pgm);
6301 close(child.out);
6302
6303 if (finish_command(&child) || err) {
6304 strbuf_release(&buf);
6305 remove_tempfile();
6306 return NULL;
6307 }
6308 remove_tempfile();
6309
6310 return strbuf_detach(&buf, outsize);
6311 }
6312
6313 size_t fill_textconv(struct userdiff_driver *driver,
6314 struct diff_filespec *df,
6315 char **outbuf)
6316 {
6317 size_t size;
6318
6319 if (!driver) {
6320 if (!DIFF_FILE_VALID(df)) {
6321 *outbuf = "";
6322 return 0;
6323 }
6324 if (diff_populate_filespec(df, 0))
6325 die("unable to read files to diff");
6326 *outbuf = df->data;
6327 return df->size;
6328 }
6329
6330 if (!driver->textconv)
6331 BUG("fill_textconv called with non-textconv driver");
6332
6333 if (driver->textconv_cache && df->oid_valid) {
6334 *outbuf = notes_cache_get(driver->textconv_cache,
6335 &df->oid,
6336 &size);
6337 if (*outbuf)
6338 return size;
6339 }
6340
6341 *outbuf = run_textconv(driver->textconv, df, &size);
6342 if (!*outbuf)
6343 die("unable to read files to diff");
6344
6345 if (driver->textconv_cache && df->oid_valid) {
6346 /* ignore errors, as we might be in a readonly repository */
6347 notes_cache_put(driver->textconv_cache, &df->oid, *outbuf,
6348 size);
6349 /*
6350 * we could save up changes and flush them all at the end,
6351 * but we would need an extra call after all diffing is done.
6352 * Since generating a cache entry is the slow path anyway,
6353 * this extra overhead probably isn't a big deal.
6354 */
6355 notes_cache_write(driver->textconv_cache);
6356 }
6357
6358 return size;
6359 }
6360
6361 int textconv_object(const char *path,
6362 unsigned mode,
6363 const struct object_id *oid,
6364 int oid_valid,
6365 char **buf,
6366 unsigned long *buf_size)
6367 {
6368 struct diff_filespec *df;
6369 struct userdiff_driver *textconv;
6370
6371 df = alloc_filespec(path);
6372 fill_filespec(df, oid, oid_valid, mode);
6373 textconv = get_textconv(df);
6374 if (!textconv) {
6375 free_filespec(df);
6376 return 0;
6377 }
6378
6379 *buf_size = fill_textconv(textconv, df, buf);
6380 free_filespec(df);
6381 return 1;
6382 }
6383
6384 void setup_diff_pager(struct diff_options *opt)
6385 {
6386 /*
6387 * If the user asked for our exit code, then either they want --quiet
6388 * or --exit-code. We should definitely not bother with a pager in the
6389 * former case, as we will generate no output. Since we still properly
6390 * report our exit code even when a pager is run, we _could_ run a
6391 * pager with --exit-code. But since we have not done so historically,
6392 * and because it is easy to find people oneline advising "git diff
6393 * --exit-code" in hooks and other scripts, we do not do so.
6394 */
6395 if (!opt->flags.exit_with_status &&
6396 check_pager_config("diff") != 0)
6397 setup_pager();
6398 }
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