Merge branch 'eb/gitweb-more-trailers'
[git] / builtin / blame.c
1 /*
2  * Blame
3  *
4  * Copyright (c) 2006, 2014 by its authors
5  * See COPYING for licensing conditions
6  */
7
8 #include "cache.h"
9 #include "config.h"
10 #include "color.h"
11 #include "builtin.h"
12 #include "repository.h"
13 #include "commit.h"
14 #include "diff.h"
15 #include "revision.h"
16 #include "quote.h"
17 #include "string-list.h"
18 #include "mailmap.h"
19 #include "parse-options.h"
20 #include "prio-queue.h"
21 #include "utf8.h"
22 #include "userdiff.h"
23 #include "line-range.h"
24 #include "line-log.h"
25 #include "dir.h"
26 #include "progress.h"
27 #include "object-store.h"
28 #include "blame.h"
29 #include "refs.h"
30
31 static char blame_usage[] = N_("git blame [<options>] [<rev-opts>] [<rev>] [--] <file>");
32
33 static const char *blame_opt_usage[] = {
34         blame_usage,
35         "",
36         N_("<rev-opts> are documented in git-rev-list(1)"),
37         NULL
38 };
39
40 static int longest_file;
41 static int longest_author;
42 static int max_orig_digits;
43 static int max_digits;
44 static int max_score_digits;
45 static int show_root;
46 static int reverse;
47 static int blank_boundary;
48 static int incremental;
49 static int xdl_opts;
50 static int abbrev = -1;
51 static int no_whole_file_rename;
52 static int show_progress;
53 static char repeated_meta_color[COLOR_MAXLEN];
54 static int coloring_mode;
55 static struct string_list ignore_revs_file_list = STRING_LIST_INIT_NODUP;
56 static int mark_unblamable_lines;
57 static int mark_ignored_lines;
58
59 static struct date_mode blame_date_mode = { DATE_ISO8601 };
60 static size_t blame_date_width;
61
62 static struct string_list mailmap = STRING_LIST_INIT_NODUP;
63
64 #ifndef DEBUG_BLAME
65 #define DEBUG_BLAME 0
66 #endif
67
68 static unsigned blame_move_score;
69 static unsigned blame_copy_score;
70
71 /* Remember to update object flag allocation in object.h */
72 #define METAINFO_SHOWN          (1u<<12)
73 #define MORE_THAN_ONE_PATH      (1u<<13)
74
75 struct progress_info {
76         struct progress *progress;
77         int blamed_lines;
78 };
79
80 static const char *nth_line_cb(void *data, long lno)
81 {
82         return blame_nth_line((struct blame_scoreboard *)data, lno);
83 }
84
85 /*
86  * Information on commits, used for output.
87  */
88 struct commit_info {
89         struct strbuf author;
90         struct strbuf author_mail;
91         timestamp_t author_time;
92         struct strbuf author_tz;
93
94         /* filled only when asked for details */
95         struct strbuf committer;
96         struct strbuf committer_mail;
97         timestamp_t committer_time;
98         struct strbuf committer_tz;
99
100         struct strbuf summary;
101 };
102
103 /*
104  * Parse author/committer line in the commit object buffer
105  */
106 static void get_ac_line(const char *inbuf, const char *what,
107         struct strbuf *name, struct strbuf *mail,
108         timestamp_t *time, struct strbuf *tz)
109 {
110         struct ident_split ident;
111         size_t len, maillen, namelen;
112         char *tmp, *endp;
113         const char *namebuf, *mailbuf;
114
115         tmp = strstr(inbuf, what);
116         if (!tmp)
117                 goto error_out;
118         tmp += strlen(what);
119         endp = strchr(tmp, '\n');
120         if (!endp)
121                 len = strlen(tmp);
122         else
123                 len = endp - tmp;
124
125         if (split_ident_line(&ident, tmp, len)) {
126         error_out:
127                 /* Ugh */
128                 tmp = "(unknown)";
129                 strbuf_addstr(name, tmp);
130                 strbuf_addstr(mail, tmp);
131                 strbuf_addstr(tz, tmp);
132                 *time = 0;
133                 return;
134         }
135
136         namelen = ident.name_end - ident.name_begin;
137         namebuf = ident.name_begin;
138
139         maillen = ident.mail_end - ident.mail_begin;
140         mailbuf = ident.mail_begin;
141
142         if (ident.date_begin && ident.date_end)
143                 *time = strtoul(ident.date_begin, NULL, 10);
144         else
145                 *time = 0;
146
147         if (ident.tz_begin && ident.tz_end)
148                 strbuf_add(tz, ident.tz_begin, ident.tz_end - ident.tz_begin);
149         else
150                 strbuf_addstr(tz, "(unknown)");
151
152         /*
153          * Now, convert both name and e-mail using mailmap
154          */
155         map_user(&mailmap, &mailbuf, &maillen,
156                  &namebuf, &namelen);
157
158         strbuf_addf(mail, "<%.*s>", (int)maillen, mailbuf);
159         strbuf_add(name, namebuf, namelen);
160 }
161
162 static void commit_info_init(struct commit_info *ci)
163 {
164
165         strbuf_init(&ci->author, 0);
166         strbuf_init(&ci->author_mail, 0);
167         strbuf_init(&ci->author_tz, 0);
168         strbuf_init(&ci->committer, 0);
169         strbuf_init(&ci->committer_mail, 0);
170         strbuf_init(&ci->committer_tz, 0);
171         strbuf_init(&ci->summary, 0);
172 }
173
174 static void commit_info_destroy(struct commit_info *ci)
175 {
176
177         strbuf_release(&ci->author);
178         strbuf_release(&ci->author_mail);
179         strbuf_release(&ci->author_tz);
180         strbuf_release(&ci->committer);
181         strbuf_release(&ci->committer_mail);
182         strbuf_release(&ci->committer_tz);
183         strbuf_release(&ci->summary);
184 }
185
186 static void get_commit_info(struct commit *commit,
187                             struct commit_info *ret,
188                             int detailed)
189 {
190         int len;
191         const char *subject, *encoding;
192         const char *message;
193
194         commit_info_init(ret);
195
196         encoding = get_log_output_encoding();
197         message = logmsg_reencode(commit, NULL, encoding);
198         get_ac_line(message, "\nauthor ",
199                     &ret->author, &ret->author_mail,
200                     &ret->author_time, &ret->author_tz);
201
202         if (!detailed) {
203                 unuse_commit_buffer(commit, message);
204                 return;
205         }
206
207         get_ac_line(message, "\ncommitter ",
208                     &ret->committer, &ret->committer_mail,
209                     &ret->committer_time, &ret->committer_tz);
210
211         len = find_commit_subject(message, &subject);
212         if (len)
213                 strbuf_add(&ret->summary, subject, len);
214         else
215                 strbuf_addf(&ret->summary, "(%s)", oid_to_hex(&commit->object.oid));
216
217         unuse_commit_buffer(commit, message);
218 }
219
220 /*
221  * Write out any suspect information which depends on the path. This must be
222  * handled separately from emit_one_suspect_detail(), because a given commit
223  * may have changes in multiple paths. So this needs to appear each time
224  * we mention a new group.
225  *
226  * To allow LF and other nonportable characters in pathnames,
227  * they are c-style quoted as needed.
228  */
229 static void write_filename_info(struct blame_origin *suspect)
230 {
231         if (suspect->previous) {
232                 struct blame_origin *prev = suspect->previous;
233                 printf("previous %s ", oid_to_hex(&prev->commit->object.oid));
234                 write_name_quoted(prev->path, stdout, '\n');
235         }
236         printf("filename ");
237         write_name_quoted(suspect->path, stdout, '\n');
238 }
239
240 /*
241  * Porcelain/Incremental format wants to show a lot of details per
242  * commit.  Instead of repeating this every line, emit it only once,
243  * the first time each commit appears in the output (unless the
244  * user has specifically asked for us to repeat).
245  */
246 static int emit_one_suspect_detail(struct blame_origin *suspect, int repeat)
247 {
248         struct commit_info ci;
249
250         if (!repeat && (suspect->commit->object.flags & METAINFO_SHOWN))
251                 return 0;
252
253         suspect->commit->object.flags |= METAINFO_SHOWN;
254         get_commit_info(suspect->commit, &ci, 1);
255         printf("author %s\n", ci.author.buf);
256         printf("author-mail %s\n", ci.author_mail.buf);
257         printf("author-time %"PRItime"\n", ci.author_time);
258         printf("author-tz %s\n", ci.author_tz.buf);
259         printf("committer %s\n", ci.committer.buf);
260         printf("committer-mail %s\n", ci.committer_mail.buf);
261         printf("committer-time %"PRItime"\n", ci.committer_time);
262         printf("committer-tz %s\n", ci.committer_tz.buf);
263         printf("summary %s\n", ci.summary.buf);
264         if (suspect->commit->object.flags & UNINTERESTING)
265                 printf("boundary\n");
266
267         commit_info_destroy(&ci);
268
269         return 1;
270 }
271
272 /*
273  * The blame_entry is found to be guilty for the range.
274  * Show it in incremental output.
275  */
276 static void found_guilty_entry(struct blame_entry *ent, void *data)
277 {
278         struct progress_info *pi = (struct progress_info *)data;
279
280         if (incremental) {
281                 struct blame_origin *suspect = ent->suspect;
282
283                 printf("%s %d %d %d\n",
284                        oid_to_hex(&suspect->commit->object.oid),
285                        ent->s_lno + 1, ent->lno + 1, ent->num_lines);
286                 emit_one_suspect_detail(suspect, 0);
287                 write_filename_info(suspect);
288                 maybe_flush_or_die(stdout, "stdout");
289         }
290         pi->blamed_lines += ent->num_lines;
291         display_progress(pi->progress, pi->blamed_lines);
292 }
293
294 static const char *format_time(timestamp_t time, const char *tz_str,
295                                int show_raw_time)
296 {
297         static struct strbuf time_buf = STRBUF_INIT;
298
299         strbuf_reset(&time_buf);
300         if (show_raw_time) {
301                 strbuf_addf(&time_buf, "%"PRItime" %s", time, tz_str);
302         }
303         else {
304                 const char *time_str;
305                 size_t time_width;
306                 int tz;
307                 tz = atoi(tz_str);
308                 time_str = show_date(time, tz, &blame_date_mode);
309                 strbuf_addstr(&time_buf, time_str);
310                 /*
311                  * Add space paddings to time_buf to display a fixed width
312                  * string, and use time_width for display width calibration.
313                  */
314                 for (time_width = utf8_strwidth(time_str);
315                      time_width < blame_date_width;
316                      time_width++)
317                         strbuf_addch(&time_buf, ' ');
318         }
319         return time_buf.buf;
320 }
321
322 #define OUTPUT_ANNOTATE_COMPAT      (1U<<0)
323 #define OUTPUT_LONG_OBJECT_NAME     (1U<<1)
324 #define OUTPUT_RAW_TIMESTAMP        (1U<<2)
325 #define OUTPUT_PORCELAIN            (1U<<3)
326 #define OUTPUT_SHOW_NAME            (1U<<4)
327 #define OUTPUT_SHOW_NUMBER          (1U<<5)
328 #define OUTPUT_SHOW_SCORE           (1U<<6)
329 #define OUTPUT_NO_AUTHOR            (1U<<7)
330 #define OUTPUT_SHOW_EMAIL           (1U<<8)
331 #define OUTPUT_LINE_PORCELAIN       (1U<<9)
332 #define OUTPUT_COLOR_LINE           (1U<<10)
333 #define OUTPUT_SHOW_AGE_WITH_COLOR  (1U<<11)
334
335 static void emit_porcelain_details(struct blame_origin *suspect, int repeat)
336 {
337         if (emit_one_suspect_detail(suspect, repeat) ||
338             (suspect->commit->object.flags & MORE_THAN_ONE_PATH))
339                 write_filename_info(suspect);
340 }
341
342 static void emit_porcelain(struct blame_scoreboard *sb, struct blame_entry *ent,
343                            int opt)
344 {
345         int repeat = opt & OUTPUT_LINE_PORCELAIN;
346         int cnt;
347         const char *cp;
348         struct blame_origin *suspect = ent->suspect;
349         char hex[GIT_MAX_HEXSZ + 1];
350
351         oid_to_hex_r(hex, &suspect->commit->object.oid);
352         printf("%s %d %d %d\n",
353                hex,
354                ent->s_lno + 1,
355                ent->lno + 1,
356                ent->num_lines);
357         emit_porcelain_details(suspect, repeat);
358
359         cp = blame_nth_line(sb, ent->lno);
360         for (cnt = 0; cnt < ent->num_lines; cnt++) {
361                 char ch;
362                 if (cnt) {
363                         printf("%s %d %d\n", hex,
364                                ent->s_lno + 1 + cnt,
365                                ent->lno + 1 + cnt);
366                         if (repeat)
367                                 emit_porcelain_details(suspect, 1);
368                 }
369                 putchar('\t');
370                 do {
371                         ch = *cp++;
372                         putchar(ch);
373                 } while (ch != '\n' &&
374                          cp < sb->final_buf + sb->final_buf_size);
375         }
376
377         if (sb->final_buf_size && cp[-1] != '\n')
378                 putchar('\n');
379 }
380
381 static struct color_field {
382         timestamp_t hop;
383         char col[COLOR_MAXLEN];
384 } *colorfield;
385 static int colorfield_nr, colorfield_alloc;
386
387 static void parse_color_fields(const char *s)
388 {
389         struct string_list l = STRING_LIST_INIT_DUP;
390         struct string_list_item *item;
391         enum { EXPECT_DATE, EXPECT_COLOR } next = EXPECT_COLOR;
392
393         colorfield_nr = 0;
394
395         /* Ideally this would be stripped and split at the same time? */
396         string_list_split(&l, s, ',', -1);
397         ALLOC_GROW(colorfield, colorfield_nr + 1, colorfield_alloc);
398
399         for_each_string_list_item(item, &l) {
400                 switch (next) {
401                 case EXPECT_DATE:
402                         colorfield[colorfield_nr].hop = approxidate(item->string);
403                         next = EXPECT_COLOR;
404                         colorfield_nr++;
405                         ALLOC_GROW(colorfield, colorfield_nr + 1, colorfield_alloc);
406                         break;
407                 case EXPECT_COLOR:
408                         if (color_parse(item->string, colorfield[colorfield_nr].col))
409                                 die(_("expecting a color: %s"), item->string);
410                         next = EXPECT_DATE;
411                         break;
412                 }
413         }
414
415         if (next == EXPECT_COLOR)
416                 die(_("must end with a color"));
417
418         colorfield[colorfield_nr].hop = TIME_MAX;
419         string_list_clear(&l, 0);
420 }
421
422 static void setup_default_color_by_age(void)
423 {
424         parse_color_fields("blue,12 month ago,white,1 month ago,red");
425 }
426
427 static void determine_line_heat(struct blame_entry *ent, const char **dest_color)
428 {
429         int i = 0;
430         struct commit_info ci;
431         get_commit_info(ent->suspect->commit, &ci, 1);
432
433         while (i < colorfield_nr && ci.author_time > colorfield[i].hop)
434                 i++;
435
436         *dest_color = colorfield[i].col;
437 }
438
439 static void emit_other(struct blame_scoreboard *sb, struct blame_entry *ent, int opt)
440 {
441         int cnt;
442         const char *cp;
443         struct blame_origin *suspect = ent->suspect;
444         struct commit_info ci;
445         char hex[GIT_MAX_HEXSZ + 1];
446         int show_raw_time = !!(opt & OUTPUT_RAW_TIMESTAMP);
447         const char *default_color = NULL, *color = NULL, *reset = NULL;
448
449         get_commit_info(suspect->commit, &ci, 1);
450         oid_to_hex_r(hex, &suspect->commit->object.oid);
451
452         cp = blame_nth_line(sb, ent->lno);
453
454         if (opt & OUTPUT_SHOW_AGE_WITH_COLOR) {
455                 determine_line_heat(ent, &default_color);
456                 color = default_color;
457                 reset = GIT_COLOR_RESET;
458         }
459
460         for (cnt = 0; cnt < ent->num_lines; cnt++) {
461                 char ch;
462                 int length = (opt & OUTPUT_LONG_OBJECT_NAME) ? the_hash_algo->hexsz : abbrev;
463
464                 if (opt & OUTPUT_COLOR_LINE) {
465                         if (cnt > 0) {
466                                 color = repeated_meta_color;
467                                 reset = GIT_COLOR_RESET;
468                         } else  {
469                                 color = default_color ? default_color : NULL;
470                                 reset = default_color ? GIT_COLOR_RESET : NULL;
471                         }
472                 }
473                 if (color)
474                         fputs(color, stdout);
475
476                 if (suspect->commit->object.flags & UNINTERESTING) {
477                         if (blank_boundary)
478                                 memset(hex, ' ', length);
479                         else if (!(opt & OUTPUT_ANNOTATE_COMPAT)) {
480                                 length--;
481                                 putchar('^');
482                         }
483                 }
484
485                 if (mark_unblamable_lines && ent->unblamable) {
486                         length--;
487                         putchar('*');
488                 }
489                 if (mark_ignored_lines && ent->ignored) {
490                         length--;
491                         putchar('?');
492                 }
493                 printf("%.*s", length, hex);
494                 if (opt & OUTPUT_ANNOTATE_COMPAT) {
495                         const char *name;
496                         if (opt & OUTPUT_SHOW_EMAIL)
497                                 name = ci.author_mail.buf;
498                         else
499                                 name = ci.author.buf;
500                         printf("\t(%10s\t%10s\t%d)", name,
501                                format_time(ci.author_time, ci.author_tz.buf,
502                                            show_raw_time),
503                                ent->lno + 1 + cnt);
504                 } else {
505                         if (opt & OUTPUT_SHOW_SCORE)
506                                 printf(" %*d %02d",
507                                        max_score_digits, ent->score,
508                                        ent->suspect->refcnt);
509                         if (opt & OUTPUT_SHOW_NAME)
510                                 printf(" %-*.*s", longest_file, longest_file,
511                                        suspect->path);
512                         if (opt & OUTPUT_SHOW_NUMBER)
513                                 printf(" %*d", max_orig_digits,
514                                        ent->s_lno + 1 + cnt);
515
516                         if (!(opt & OUTPUT_NO_AUTHOR)) {
517                                 const char *name;
518                                 int pad;
519                                 if (opt & OUTPUT_SHOW_EMAIL)
520                                         name = ci.author_mail.buf;
521                                 else
522                                         name = ci.author.buf;
523                                 pad = longest_author - utf8_strwidth(name);
524                                 printf(" (%s%*s %10s",
525                                        name, pad, "",
526                                        format_time(ci.author_time,
527                                                    ci.author_tz.buf,
528                                                    show_raw_time));
529                         }
530                         printf(" %*d) ",
531                                max_digits, ent->lno + 1 + cnt);
532                 }
533                 if (reset)
534                         fputs(reset, stdout);
535                 do {
536                         ch = *cp++;
537                         putchar(ch);
538                 } while (ch != '\n' &&
539                          cp < sb->final_buf + sb->final_buf_size);
540         }
541
542         if (sb->final_buf_size && cp[-1] != '\n')
543                 putchar('\n');
544
545         commit_info_destroy(&ci);
546 }
547
548 static void output(struct blame_scoreboard *sb, int option)
549 {
550         struct blame_entry *ent;
551
552         if (option & OUTPUT_PORCELAIN) {
553                 for (ent = sb->ent; ent; ent = ent->next) {
554                         int count = 0;
555                         struct blame_origin *suspect;
556                         struct commit *commit = ent->suspect->commit;
557                         if (commit->object.flags & MORE_THAN_ONE_PATH)
558                                 continue;
559                         for (suspect = get_blame_suspects(commit); suspect; suspect = suspect->next) {
560                                 if (suspect->guilty && count++) {
561                                         commit->object.flags |= MORE_THAN_ONE_PATH;
562                                         break;
563                                 }
564                         }
565                 }
566         }
567
568         for (ent = sb->ent; ent; ent = ent->next) {
569                 if (option & OUTPUT_PORCELAIN)
570                         emit_porcelain(sb, ent, option);
571                 else {
572                         emit_other(sb, ent, option);
573                 }
574         }
575 }
576
577 /*
578  * Add phony grafts for use with -S; this is primarily to
579  * support git's cvsserver that wants to give a linear history
580  * to its clients.
581  */
582 static int read_ancestry(const char *graft_file)
583 {
584         FILE *fp = fopen_or_warn(graft_file, "r");
585         struct strbuf buf = STRBUF_INIT;
586         if (!fp)
587                 return -1;
588         while (!strbuf_getwholeline(&buf, fp, '\n')) {
589                 /* The format is just "Commit Parent1 Parent2 ...\n" */
590                 struct commit_graft *graft = read_graft_line(&buf);
591                 if (graft)
592                         register_commit_graft(the_repository, graft, 0);
593         }
594         fclose(fp);
595         strbuf_release(&buf);
596         return 0;
597 }
598
599 static int update_auto_abbrev(int auto_abbrev, struct blame_origin *suspect)
600 {
601         const char *uniq = find_unique_abbrev(&suspect->commit->object.oid,
602                                               auto_abbrev);
603         int len = strlen(uniq);
604         if (auto_abbrev < len)
605                 return len;
606         return auto_abbrev;
607 }
608
609 /*
610  * How many columns do we need to show line numbers, authors,
611  * and filenames?
612  */
613 static void find_alignment(struct blame_scoreboard *sb, int *option)
614 {
615         int longest_src_lines = 0;
616         int longest_dst_lines = 0;
617         unsigned largest_score = 0;
618         struct blame_entry *e;
619         int compute_auto_abbrev = (abbrev < 0);
620         int auto_abbrev = DEFAULT_ABBREV;
621
622         for (e = sb->ent; e; e = e->next) {
623                 struct blame_origin *suspect = e->suspect;
624                 int num;
625
626                 if (compute_auto_abbrev)
627                         auto_abbrev = update_auto_abbrev(auto_abbrev, suspect);
628                 if (strcmp(suspect->path, sb->path))
629                         *option |= OUTPUT_SHOW_NAME;
630                 num = strlen(suspect->path);
631                 if (longest_file < num)
632                         longest_file = num;
633                 if (!(suspect->commit->object.flags & METAINFO_SHOWN)) {
634                         struct commit_info ci;
635                         suspect->commit->object.flags |= METAINFO_SHOWN;
636                         get_commit_info(suspect->commit, &ci, 1);
637                         if (*option & OUTPUT_SHOW_EMAIL)
638                                 num = utf8_strwidth(ci.author_mail.buf);
639                         else
640                                 num = utf8_strwidth(ci.author.buf);
641                         if (longest_author < num)
642                                 longest_author = num;
643                         commit_info_destroy(&ci);
644                 }
645                 num = e->s_lno + e->num_lines;
646                 if (longest_src_lines < num)
647                         longest_src_lines = num;
648                 num = e->lno + e->num_lines;
649                 if (longest_dst_lines < num)
650                         longest_dst_lines = num;
651                 if (largest_score < blame_entry_score(sb, e))
652                         largest_score = blame_entry_score(sb, e);
653         }
654         max_orig_digits = decimal_width(longest_src_lines);
655         max_digits = decimal_width(longest_dst_lines);
656         max_score_digits = decimal_width(largest_score);
657
658         if (compute_auto_abbrev)
659                 /* one more abbrev length is needed for the boundary commit */
660                 abbrev = auto_abbrev + 1;
661 }
662
663 static void sanity_check_on_fail(struct blame_scoreboard *sb, int baa)
664 {
665         int opt = OUTPUT_SHOW_SCORE | OUTPUT_SHOW_NUMBER | OUTPUT_SHOW_NAME;
666         find_alignment(sb, &opt);
667         output(sb, opt);
668         die("Baa %d!", baa);
669 }
670
671 static unsigned parse_score(const char *arg)
672 {
673         char *end;
674         unsigned long score = strtoul(arg, &end, 10);
675         if (*end)
676                 return 0;
677         return score;
678 }
679
680 static const char *add_prefix(const char *prefix, const char *path)
681 {
682         return prefix_path(prefix, prefix ? strlen(prefix) : 0, path);
683 }
684
685 static int git_blame_config(const char *var, const char *value, void *cb)
686 {
687         if (!strcmp(var, "blame.showroot")) {
688                 show_root = git_config_bool(var, value);
689                 return 0;
690         }
691         if (!strcmp(var, "blame.blankboundary")) {
692                 blank_boundary = git_config_bool(var, value);
693                 return 0;
694         }
695         if (!strcmp(var, "blame.showemail")) {
696                 int *output_option = cb;
697                 if (git_config_bool(var, value))
698                         *output_option |= OUTPUT_SHOW_EMAIL;
699                 else
700                         *output_option &= ~OUTPUT_SHOW_EMAIL;
701                 return 0;
702         }
703         if (!strcmp(var, "blame.date")) {
704                 if (!value)
705                         return config_error_nonbool(var);
706                 parse_date_format(value, &blame_date_mode);
707                 return 0;
708         }
709         if (!strcmp(var, "blame.ignorerevsfile")) {
710                 const char *str;
711                 int ret;
712
713                 ret = git_config_pathname(&str, var, value);
714                 if (ret)
715                         return ret;
716                 string_list_insert(&ignore_revs_file_list, str);
717                 return 0;
718         }
719         if (!strcmp(var, "blame.markunblamablelines")) {
720                 mark_unblamable_lines = git_config_bool(var, value);
721                 return 0;
722         }
723         if (!strcmp(var, "blame.markignoredlines")) {
724                 mark_ignored_lines = git_config_bool(var, value);
725                 return 0;
726         }
727         if (!strcmp(var, "color.blame.repeatedlines")) {
728                 if (color_parse_mem(value, strlen(value), repeated_meta_color))
729                         warning(_("invalid color '%s' in color.blame.repeatedLines"),
730                                 value);
731                 return 0;
732         }
733         if (!strcmp(var, "color.blame.highlightrecent")) {
734                 parse_color_fields(value);
735                 return 0;
736         }
737
738         if (!strcmp(var, "blame.coloring")) {
739                 if (!strcmp(value, "repeatedLines")) {
740                         coloring_mode |= OUTPUT_COLOR_LINE;
741                 } else if (!strcmp(value, "highlightRecent")) {
742                         coloring_mode |= OUTPUT_SHOW_AGE_WITH_COLOR;
743                 } else if (!strcmp(value, "none")) {
744                         coloring_mode &= ~(OUTPUT_COLOR_LINE |
745                                             OUTPUT_SHOW_AGE_WITH_COLOR);
746                 } else {
747                         warning(_("invalid value for blame.coloring"));
748                         return 0;
749                 }
750         }
751
752         if (git_diff_heuristic_config(var, value, cb) < 0)
753                 return -1;
754         if (userdiff_config(var, value) < 0)
755                 return -1;
756
757         return git_default_config(var, value, cb);
758 }
759
760 static int blame_copy_callback(const struct option *option, const char *arg, int unset)
761 {
762         int *opt = option->value;
763
764         BUG_ON_OPT_NEG(unset);
765
766         /*
767          * -C enables copy from removed files;
768          * -C -C enables copy from existing files, but only
769          *       when blaming a new file;
770          * -C -C -C enables copy from existing files for
771          *          everybody
772          */
773         if (*opt & PICKAXE_BLAME_COPY_HARDER)
774                 *opt |= PICKAXE_BLAME_COPY_HARDEST;
775         if (*opt & PICKAXE_BLAME_COPY)
776                 *opt |= PICKAXE_BLAME_COPY_HARDER;
777         *opt |= PICKAXE_BLAME_COPY | PICKAXE_BLAME_MOVE;
778
779         if (arg)
780                 blame_copy_score = parse_score(arg);
781         return 0;
782 }
783
784 static int blame_move_callback(const struct option *option, const char *arg, int unset)
785 {
786         int *opt = option->value;
787
788         BUG_ON_OPT_NEG(unset);
789
790         *opt |= PICKAXE_BLAME_MOVE;
791
792         if (arg)
793                 blame_move_score = parse_score(arg);
794         return 0;
795 }
796
797 static int is_a_rev(const char *name)
798 {
799         struct object_id oid;
800
801         if (get_oid(name, &oid))
802                 return 0;
803         return OBJ_NONE < oid_object_info(the_repository, &oid, NULL);
804 }
805
806 static void build_ignorelist(struct blame_scoreboard *sb,
807                              struct string_list *ignore_revs_file_list,
808                              struct string_list *ignore_rev_list)
809 {
810         struct string_list_item *i;
811         struct object_id oid;
812
813         oidset_init(&sb->ignore_list, 0);
814         for_each_string_list_item(i, ignore_revs_file_list) {
815                 if (!strcmp(i->string, ""))
816                         oidset_clear(&sb->ignore_list);
817                 else
818                         oidset_parse_file(&sb->ignore_list, i->string);
819         }
820         for_each_string_list_item(i, ignore_rev_list) {
821                 if (get_oid_committish(i->string, &oid))
822                         die(_("cannot find revision %s to ignore"), i->string);
823                 oidset_insert(&sb->ignore_list, &oid);
824         }
825 }
826
827 int cmd_blame(int argc, const char **argv, const char *prefix)
828 {
829         struct rev_info revs;
830         const char *path;
831         struct blame_scoreboard sb;
832         struct blame_origin *o;
833         struct blame_entry *ent = NULL;
834         long dashdash_pos, lno;
835         struct progress_info pi = { NULL, 0 };
836
837         struct string_list range_list = STRING_LIST_INIT_NODUP;
838         struct string_list ignore_rev_list = STRING_LIST_INIT_NODUP;
839         int output_option = 0, opt = 0;
840         int show_stats = 0;
841         const char *revs_file = NULL;
842         const char *contents_from = NULL;
843         const struct option options[] = {
844                 OPT_BOOL(0, "incremental", &incremental, N_("Show blame entries as we find them, incrementally")),
845                 OPT_BOOL('b', NULL, &blank_boundary, N_("Show blank SHA-1 for boundary commits (Default: off)")),
846                 OPT_BOOL(0, "root", &show_root, N_("Do not treat root commits as boundaries (Default: off)")),
847                 OPT_BOOL(0, "show-stats", &show_stats, N_("Show work cost statistics")),
848                 OPT_BOOL(0, "progress", &show_progress, N_("Force progress reporting")),
849                 OPT_BIT(0, "score-debug", &output_option, N_("Show output score for blame entries"), OUTPUT_SHOW_SCORE),
850                 OPT_BIT('f', "show-name", &output_option, N_("Show original filename (Default: auto)"), OUTPUT_SHOW_NAME),
851                 OPT_BIT('n', "show-number", &output_option, N_("Show original linenumber (Default: off)"), OUTPUT_SHOW_NUMBER),
852                 OPT_BIT('p', "porcelain", &output_option, N_("Show in a format designed for machine consumption"), OUTPUT_PORCELAIN),
853                 OPT_BIT(0, "line-porcelain", &output_option, N_("Show porcelain format with per-line commit information"), OUTPUT_PORCELAIN|OUTPUT_LINE_PORCELAIN),
854                 OPT_BIT('c', NULL, &output_option, N_("Use the same output mode as git-annotate (Default: off)"), OUTPUT_ANNOTATE_COMPAT),
855                 OPT_BIT('t', NULL, &output_option, N_("Show raw timestamp (Default: off)"), OUTPUT_RAW_TIMESTAMP),
856                 OPT_BIT('l', NULL, &output_option, N_("Show long commit SHA1 (Default: off)"), OUTPUT_LONG_OBJECT_NAME),
857                 OPT_BIT('s', NULL, &output_option, N_("Suppress author name and timestamp (Default: off)"), OUTPUT_NO_AUTHOR),
858                 OPT_BIT('e', "show-email", &output_option, N_("Show author email instead of name (Default: off)"), OUTPUT_SHOW_EMAIL),
859                 OPT_BIT('w', NULL, &xdl_opts, N_("Ignore whitespace differences"), XDF_IGNORE_WHITESPACE),
860                 OPT_STRING_LIST(0, "ignore-rev", &ignore_rev_list, N_("rev"), N_("Ignore <rev> when blaming")),
861                 OPT_STRING_LIST(0, "ignore-revs-file", &ignore_revs_file_list, N_("file"), N_("Ignore revisions from <file>")),
862                 OPT_BIT(0, "color-lines", &output_option, N_("color redundant metadata from previous line differently"), OUTPUT_COLOR_LINE),
863                 OPT_BIT(0, "color-by-age", &output_option, N_("color lines by age"), OUTPUT_SHOW_AGE_WITH_COLOR),
864                 OPT_BIT(0, "minimal", &xdl_opts, N_("Spend extra cycles to find better match"), XDF_NEED_MINIMAL),
865                 OPT_STRING('S', NULL, &revs_file, N_("file"), N_("Use revisions from <file> instead of calling git-rev-list")),
866                 OPT_STRING(0, "contents", &contents_from, N_("file"), N_("Use <file>'s contents as the final image")),
867                 { OPTION_CALLBACK, 'C', NULL, &opt, N_("score"), N_("Find line copies within and across files"), PARSE_OPT_OPTARG, blame_copy_callback },
868                 { OPTION_CALLBACK, 'M', NULL, &opt, N_("score"), N_("Find line movements within and across files"), PARSE_OPT_OPTARG, blame_move_callback },
869                 OPT_STRING_LIST('L', NULL, &range_list, N_("n,m"), N_("Process only line range n,m, counting from 1")),
870                 OPT__ABBREV(&abbrev),
871                 OPT_END()
872         };
873
874         struct parse_opt_ctx_t ctx;
875         int cmd_is_annotate = !strcmp(argv[0], "annotate");
876         struct range_set ranges;
877         unsigned int range_i;
878         long anchor;
879         const int hexsz = the_hash_algo->hexsz;
880
881         setup_default_color_by_age();
882         git_config(git_blame_config, &output_option);
883         repo_init_revisions(the_repository, &revs, NULL);
884         revs.date_mode = blame_date_mode;
885         revs.diffopt.flags.allow_textconv = 1;
886         revs.diffopt.flags.follow_renames = 1;
887
888         save_commit_buffer = 0;
889         dashdash_pos = 0;
890         show_progress = -1;
891
892         parse_options_start(&ctx, argc, argv, prefix, options,
893                             PARSE_OPT_KEEP_DASHDASH | PARSE_OPT_KEEP_ARGV0);
894         for (;;) {
895                 switch (parse_options_step(&ctx, options, blame_opt_usage)) {
896                 case PARSE_OPT_HELP:
897                 case PARSE_OPT_ERROR:
898                         exit(129);
899                 case PARSE_OPT_COMPLETE:
900                         exit(0);
901                 case PARSE_OPT_DONE:
902                         if (ctx.argv[0])
903                                 dashdash_pos = ctx.cpidx;
904                         goto parse_done;
905                 }
906
907                 if (!strcmp(ctx.argv[0], "--reverse")) {
908                         ctx.argv[0] = "--children";
909                         reverse = 1;
910                 }
911                 parse_revision_opt(&revs, &ctx, options, blame_opt_usage);
912         }
913 parse_done:
914         no_whole_file_rename = !revs.diffopt.flags.follow_renames;
915         xdl_opts |= revs.diffopt.xdl_opts & XDF_INDENT_HEURISTIC;
916         revs.diffopt.flags.follow_renames = 0;
917         argc = parse_options_end(&ctx);
918
919         if (incremental || (output_option & OUTPUT_PORCELAIN)) {
920                 if (show_progress > 0)
921                         die(_("--progress can't be used with --incremental or porcelain formats"));
922                 show_progress = 0;
923         } else if (show_progress < 0)
924                 show_progress = isatty(2);
925
926         if (0 < abbrev && abbrev < hexsz)
927                 /* one more abbrev length is needed for the boundary commit */
928                 abbrev++;
929         else if (!abbrev)
930                 abbrev = hexsz;
931
932         if (revs_file && read_ancestry(revs_file))
933                 die_errno("reading graft file '%s' failed", revs_file);
934
935         if (cmd_is_annotate) {
936                 output_option |= OUTPUT_ANNOTATE_COMPAT;
937                 blame_date_mode.type = DATE_ISO8601;
938         } else {
939                 blame_date_mode = revs.date_mode;
940         }
941
942         /* The maximum width used to show the dates */
943         switch (blame_date_mode.type) {
944         case DATE_RFC2822:
945                 blame_date_width = sizeof("Thu, 19 Oct 2006 16:00:04 -0700");
946                 break;
947         case DATE_ISO8601_STRICT:
948                 blame_date_width = sizeof("2006-10-19T16:00:04-07:00");
949                 break;
950         case DATE_ISO8601:
951                 blame_date_width = sizeof("2006-10-19 16:00:04 -0700");
952                 break;
953         case DATE_RAW:
954                 blame_date_width = sizeof("1161298804 -0700");
955                 break;
956         case DATE_UNIX:
957                 blame_date_width = sizeof("1161298804");
958                 break;
959         case DATE_SHORT:
960                 blame_date_width = sizeof("2006-10-19");
961                 break;
962         case DATE_RELATIVE:
963                 /*
964                  * TRANSLATORS: This string is used to tell us the
965                  * maximum display width for a relative timestamp in
966                  * "git blame" output.  For C locale, "4 years, 11
967                  * months ago", which takes 22 places, is the longest
968                  * among various forms of relative timestamps, but
969                  * your language may need more or fewer display
970                  * columns.
971                  */
972                 blame_date_width = utf8_strwidth(_("4 years, 11 months ago")) + 1; /* add the null */
973                 break;
974         case DATE_HUMAN:
975                 /* If the year is shown, no time is shown */
976                 blame_date_width = sizeof("Thu Oct 19 16:00");
977                 break;
978         case DATE_NORMAL:
979                 blame_date_width = sizeof("Thu Oct 19 16:00:04 2006 -0700");
980                 break;
981         case DATE_STRFTIME:
982                 blame_date_width = strlen(show_date(0, 0, &blame_date_mode)) + 1; /* add the null */
983                 break;
984         }
985         blame_date_width -= 1; /* strip the null */
986
987         if (revs.diffopt.flags.find_copies_harder)
988                 opt |= (PICKAXE_BLAME_COPY | PICKAXE_BLAME_MOVE |
989                         PICKAXE_BLAME_COPY_HARDER);
990
991         /*
992          * We have collected options unknown to us in argv[1..unk]
993          * which are to be passed to revision machinery if we are
994          * going to do the "bottom" processing.
995          *
996          * The remaining are:
997          *
998          * (1) if dashdash_pos != 0, it is either
999          *     "blame [revisions] -- <path>" or
1000          *     "blame -- <path> <rev>"
1001          *
1002          * (2) otherwise, it is one of the two:
1003          *     "blame [revisions] <path>"
1004          *     "blame <path> <rev>"
1005          *
1006          * Note that we must strip out <path> from the arguments: we do not
1007          * want the path pruning but we may want "bottom" processing.
1008          */
1009         if (dashdash_pos) {
1010                 switch (argc - dashdash_pos - 1) {
1011                 case 2: /* (1b) */
1012                         if (argc != 4)
1013                                 usage_with_options(blame_opt_usage, options);
1014                         /* reorder for the new way: <rev> -- <path> */
1015                         argv[1] = argv[3];
1016                         argv[3] = argv[2];
1017                         argv[2] = "--";
1018                         /* FALLTHROUGH */
1019                 case 1: /* (1a) */
1020                         path = add_prefix(prefix, argv[--argc]);
1021                         argv[argc] = NULL;
1022                         break;
1023                 default:
1024                         usage_with_options(blame_opt_usage, options);
1025                 }
1026         } else {
1027                 if (argc < 2)
1028                         usage_with_options(blame_opt_usage, options);
1029                 if (argc == 3 && is_a_rev(argv[argc - 1])) { /* (2b) */
1030                         path = add_prefix(prefix, argv[1]);
1031                         argv[1] = argv[2];
1032                 } else {        /* (2a) */
1033                         if (argc == 2 && is_a_rev(argv[1]) && !get_git_work_tree())
1034                                 die("missing <path> to blame");
1035                         path = add_prefix(prefix, argv[argc - 1]);
1036                 }
1037                 argv[argc - 1] = "--";
1038         }
1039
1040         revs.disable_stdin = 1;
1041         setup_revisions(argc, argv, &revs, NULL);
1042         if (!revs.pending.nr && is_bare_repository()) {
1043                 struct commit *head_commit;
1044                 struct object_id head_oid;
1045
1046                 if (!resolve_ref_unsafe("HEAD", RESOLVE_REF_READING,
1047                                         &head_oid, NULL) ||
1048                     !(head_commit = lookup_commit_reference_gently(revs.repo,
1049                                                              &head_oid, 1)))
1050                         die("no such ref: HEAD");
1051
1052                 add_pending_object(&revs, &head_commit->object, "HEAD");
1053         }
1054
1055         init_scoreboard(&sb);
1056         sb.revs = &revs;
1057         sb.contents_from = contents_from;
1058         sb.reverse = reverse;
1059         sb.repo = the_repository;
1060         build_ignorelist(&sb, &ignore_revs_file_list, &ignore_rev_list);
1061         string_list_clear(&ignore_revs_file_list, 0);
1062         string_list_clear(&ignore_rev_list, 0);
1063         setup_scoreboard(&sb, path, &o);
1064
1065         /*
1066          * Changed-path Bloom filters are disabled when looking
1067          * for copies.
1068          */
1069         if (!(opt & PICKAXE_BLAME_COPY))
1070                 setup_blame_bloom_data(&sb, path);
1071
1072         lno = sb.num_lines;
1073
1074         if (lno && !range_list.nr)
1075                 string_list_append(&range_list, "1");
1076
1077         anchor = 1;
1078         range_set_init(&ranges, range_list.nr);
1079         for (range_i = 0; range_i < range_list.nr; ++range_i) {
1080                 long bottom, top;
1081                 if (parse_range_arg(range_list.items[range_i].string,
1082                                     nth_line_cb, &sb, lno, anchor,
1083                                     &bottom, &top, sb.path,
1084                                     the_repository->index))
1085                         usage(blame_usage);
1086                 if ((!lno && (top || bottom)) || lno < bottom)
1087                         die(Q_("file %s has only %lu line",
1088                                "file %s has only %lu lines",
1089                                lno), path, lno);
1090                 if (bottom < 1)
1091                         bottom = 1;
1092                 if (top < 1 || lno < top)
1093                         top = lno;
1094                 bottom--;
1095                 range_set_append_unsafe(&ranges, bottom, top);
1096                 anchor = top + 1;
1097         }
1098         sort_and_merge_range_set(&ranges);
1099
1100         for (range_i = ranges.nr; range_i > 0; --range_i) {
1101                 const struct range *r = &ranges.ranges[range_i - 1];
1102                 ent = blame_entry_prepend(ent, r->start, r->end, o);
1103         }
1104
1105         o->suspects = ent;
1106         prio_queue_put(&sb.commits, o->commit);
1107
1108         blame_origin_decref(o);
1109
1110         range_set_release(&ranges);
1111         string_list_clear(&range_list, 0);
1112
1113         sb.ent = NULL;
1114         sb.path = path;
1115
1116         if (blame_move_score)
1117                 sb.move_score = blame_move_score;
1118         if (blame_copy_score)
1119                 sb.copy_score = blame_copy_score;
1120
1121         sb.debug = DEBUG_BLAME;
1122         sb.on_sanity_fail = &sanity_check_on_fail;
1123
1124         sb.show_root = show_root;
1125         sb.xdl_opts = xdl_opts;
1126         sb.no_whole_file_rename = no_whole_file_rename;
1127
1128         read_mailmap(&mailmap, NULL);
1129
1130         sb.found_guilty_entry = &found_guilty_entry;
1131         sb.found_guilty_entry_data = &pi;
1132         if (show_progress)
1133                 pi.progress = start_delayed_progress(_("Blaming lines"), sb.num_lines);
1134
1135         assign_blame(&sb, opt);
1136
1137         stop_progress(&pi.progress);
1138
1139         if (!incremental)
1140                 setup_pager();
1141         else
1142                 return 0;
1143
1144         blame_sort_final(&sb);
1145
1146         blame_coalesce(&sb);
1147
1148         if (!(output_option & (OUTPUT_COLOR_LINE | OUTPUT_SHOW_AGE_WITH_COLOR)))
1149                 output_option |= coloring_mode;
1150
1151         if (!(output_option & OUTPUT_PORCELAIN)) {
1152                 find_alignment(&sb, &output_option);
1153                 if (!*repeated_meta_color &&
1154                     (output_option & OUTPUT_COLOR_LINE))
1155                         xsnprintf(repeated_meta_color,
1156                                   sizeof(repeated_meta_color),
1157                                   "%s", GIT_COLOR_CYAN);
1158         }
1159         if (output_option & OUTPUT_ANNOTATE_COMPAT)
1160                 output_option &= ~(OUTPUT_COLOR_LINE | OUTPUT_SHOW_AGE_WITH_COLOR);
1161
1162         output(&sb, output_option);
1163         free((void *)sb.final_buf);
1164         for (ent = sb.ent; ent; ) {
1165                 struct blame_entry *e = ent->next;
1166                 free(ent);
1167                 ent = e;
1168         }
1169
1170         if (show_stats) {
1171                 printf("num read blob: %d\n", sb.num_read_blob);
1172                 printf("num get patch: %d\n", sb.num_get_patch);
1173                 printf("num commits: %d\n", sb.num_commits);
1174         }
1175
1176         cleanup_scoreboard(&sb);
1177         return 0;
1178 }