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