git.oblomov.eu Git - git/blob - 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 "commit.h"
  13 #include "diff.h"
  14 #include "revision.h"
  15 #include "quote.h"
  16 #include "string-list.h"
  17 #include "mailmap.h"
  18 #include "parse-options.h"
  19 #include "prio-queue.h"
  20 #include "utf8.h"
  21 #include "userdiff.h"
  22 #include "line-range.h"
  23 #include "line-log.h"
  24 #include "dir.h"
  25 #include "progress.h"
  26 #include "blame.h"
  27 #include "string-list.h"
  28
  29 static char blame_usage[] = N_("git blame [<options>] [<rev-opts>] [<rev>] [--] <file>");
  30
  31 static const char *blame_opt_usage[] = {
  32         blame_usage,
  33         "",
  34         N_("<rev-opts> are documented in git-rev-list(1)"),
  35         NULL
  36 };
  37
  38 static int longest_file;
  39 static int longest_author;
  40 static int max_orig_digits;
  41 static int max_digits;
  42 static int max_score_digits;
  43 static int show_root;
  44 static int reverse;
  45 static int blank_boundary;
  46 static int incremental;
  47 static int xdl_opts;
  48 static int abbrev = -1;
  49 static int no_whole_file_rename;
  50 static int show_progress;
  51 static char repeated_meta_color[COLOR_MAXLEN];
  52 static int coloring_mode;
  53
  54 static struct date_mode blame_date_mode = { DATE_ISO8601 };
  55 static size_t blame_date_width;
  56
  57 static struct string_list mailmap = STRING_LIST_INIT_NODUP;
  58
  59 #ifndef DEBUG
  60 #define DEBUG 0
  61 #endif
  62
  63 static unsigned blame_move_score;
  64 static unsigned blame_copy_score;
  65
  66 /* Remember to update object flag allocation in object.h */
  67 #define METAINFO_SHOWN          (1u<<12)
  68 #define MORE_THAN_ONE_PATH      (1u<<13)
  69
  70 struct progress_info {
  71         struct progress *progress;
  72         int blamed_lines;
  73 };
  74
  75 static const char *nth_line_cb(void *data, long lno)
  76 {
  77         return blame_nth_line((struct blame_scoreboard *)data, lno);
  78 }
  79
  80 /*
  81  * Information on commits, used for output.
  82  */
  83 struct commit_info {
  84         struct strbuf author;
  85         struct strbuf author_mail;
  86         timestamp_t author_time;
  87         struct strbuf author_tz;
  88
  89         /* filled only when asked for details */
  90         struct strbuf committer;
  91         struct strbuf committer_mail;
  92         timestamp_t committer_time;
  93         struct strbuf committer_tz;
  94
  95         struct strbuf summary;
  96 };
  97
  98 /*
  99  * Parse author/committer line in the commit object buffer
 100  */
 101 static void get_ac_line(const char *inbuf, const char *what,
 102         struct strbuf *name, struct strbuf *mail,
 103         timestamp_t *time, struct strbuf *tz)
 104 {
 105         struct ident_split ident;
 106         size_t len, maillen, namelen;
 107         char *tmp, *endp;
 108         const char *namebuf, *mailbuf;
 109
 110         tmp = strstr(inbuf, what);
 111         if (!tmp)
 112                 goto error_out;
 113         tmp += strlen(what);
 114         endp = strchr(tmp, '\n');
 115         if (!endp)
 116                 len = strlen(tmp);
 117         else
 118                 len = endp - tmp;
 119
 120         if (split_ident_line(&ident, tmp, len)) {
 121         error_out:
 122                 /* Ugh */
 123                 tmp = "(unknown)";
 124                 strbuf_addstr(name, tmp);
 125                 strbuf_addstr(mail, tmp);
 126                 strbuf_addstr(tz, tmp);
 127                 *time = 0;
 128                 return;
 129         }
 130
 131         namelen = ident.name_end - ident.name_begin;
 132         namebuf = ident.name_begin;
 133
 134         maillen = ident.mail_end - ident.mail_begin;
 135         mailbuf = ident.mail_begin;
 136
 137         if (ident.date_begin && ident.date_end)
 138                 *time = strtoul(ident.date_begin, NULL, 10);
 139         else
 140                 *time = 0;
 141
 142         if (ident.tz_begin && ident.tz_end)
 143                 strbuf_add(tz, ident.tz_begin, ident.tz_end - ident.tz_begin);
 144         else
 145                 strbuf_addstr(tz, "(unknown)");
 146
 147         /*
 148          * Now, convert both name and e-mail using mailmap
 149          */
 150         map_user(&mailmap, &mailbuf, &maillen,
 151                  &namebuf, &namelen);
 152
 153         strbuf_addf(mail, "<%.*s>", (int)maillen, mailbuf);
 154         strbuf_add(name, namebuf, namelen);
 155 }
 156
 157 static void commit_info_init(struct commit_info *ci)
 158 {
 159
 160         strbuf_init(&ci->author, 0);
 161         strbuf_init(&ci->author_mail, 0);
 162         strbuf_init(&ci->author_tz, 0);
 163         strbuf_init(&ci->committer, 0);
 164         strbuf_init(&ci->committer_mail, 0);
 165         strbuf_init(&ci->committer_tz, 0);
 166         strbuf_init(&ci->summary, 0);
 167 }
 168
 169 static void commit_info_destroy(struct commit_info *ci)
 170 {
 171
 172         strbuf_release(&ci->author);
 173         strbuf_release(&ci->author_mail);
 174         strbuf_release(&ci->author_tz);
 175         strbuf_release(&ci->committer);
 176         strbuf_release(&ci->committer_mail);
 177         strbuf_release(&ci->committer_tz);
 178         strbuf_release(&ci->summary);
 179 }
 180
 181 static void get_commit_info(struct commit *commit,
 182                             struct commit_info *ret,
 183                             int detailed)
 184 {
 185         int len;
 186         const char *subject, *encoding;
 187         const char *message;
 188
 189         commit_info_init(ret);
 190
 191         encoding = get_log_output_encoding();
 192         message = logmsg_reencode(commit, NULL, encoding);
 193         get_ac_line(message, "\nauthor ",
 194                     &ret->author, &ret->author_mail,
 195                     &ret->author_time, &ret->author_tz);
 196
 197         if (!detailed) {
 198                 unuse_commit_buffer(commit, message);
 199                 return;
 200         }
 201
 202         get_ac_line(message, "\ncommitter ",
 203                     &ret->committer, &ret->committer_mail,
 204                     &ret->committer_time, &ret->committer_tz);
 205
 206         len = find_commit_subject(message, &subject);
 207         if (len)
 208                 strbuf_add(&ret->summary, subject, len);
 209         else
 210                 strbuf_addf(&ret->summary, "(%s)", oid_to_hex(&commit->object.oid));
 211
 212         unuse_commit_buffer(commit, message);
 213 }
 214
 215 /*
 216  * Write out any suspect information which depends on the path. This must be
 217  * handled separately from emit_one_suspect_detail(), because a given commit
 218  * may have changes in multiple paths. So this needs to appear each time
 219  * we mention a new group.
 220  *
 221  * To allow LF and other nonportable characters in pathnames,
 222  * they are c-style quoted as needed.
 223  */
 224 static void write_filename_info(struct blame_origin *suspect)
 225 {
 226         if (suspect->previous) {
 227                 struct blame_origin *prev = suspect->previous;
 228                 printf("previous %s ", oid_to_hex(&prev->commit->object.oid));
 229                 write_name_quoted(prev->path, stdout, '\n');
 230         }
 231         printf("filename ");
 232         write_name_quoted(suspect->path, stdout, '\n');
 233 }
 234
 235 /*
 236  * Porcelain/Incremental format wants to show a lot of details per
 237  * commit.  Instead of repeating this every line, emit it only once,
 238  * the first time each commit appears in the output (unless the
 239  * user has specifically asked for us to repeat).
 240  */
 241 static int emit_one_suspect_detail(struct blame_origin *suspect, int repeat)
 242 {
 243         struct commit_info ci;
 244
 245         if (!repeat && (suspect->commit->object.flags & METAINFO_SHOWN))
 246                 return 0;
 247
 248         suspect->commit->object.flags |= METAINFO_SHOWN;
 249         get_commit_info(suspect->commit, &ci, 1);
 250         printf("author %s\n", ci.author.buf);
 251         printf("author-mail %s\n", ci.author_mail.buf);
 252         printf("author-time %"PRItime"\n", ci.author_time);
 253         printf("author-tz %s\n", ci.author_tz.buf);
 254         printf("committer %s\n", ci.committer.buf);
 255         printf("committer-mail %s\n", ci.committer_mail.buf);
 256         printf("committer-time %"PRItime"\n", ci.committer_time);
 257         printf("committer-tz %s\n", ci.committer_tz.buf);
 258         printf("summary %s\n", ci.summary.buf);
 259         if (suspect->commit->object.flags & UNINTERESTING)
 260                 printf("boundary\n");
 261
 262         commit_info_destroy(&ci);
 263
 264         return 1;
 265 }
 266
 267 /*
 268  * The blame_entry is found to be guilty for the range.
 269  * Show it in incremental output.
 270  */
 271 static void found_guilty_entry(struct blame_entry *ent, void *data)
 272 {
 273         struct progress_info *pi = (struct progress_info *)data;
 274
 275         if (incremental) {
 276                 struct blame_origin *suspect = ent->suspect;
 277
 278                 printf("%s %d %d %d\n",
 279                        oid_to_hex(&suspect->commit->object.oid),
 280                        ent->s_lno + 1, ent->lno + 1, ent->num_lines);
 281                 emit_one_suspect_detail(suspect, 0);
 282                 write_filename_info(suspect);
 283                 maybe_flush_or_die(stdout, "stdout");
 284         }
 285         pi->blamed_lines += ent->num_lines;
 286         display_progress(pi->progress, pi->blamed_lines);
 287 }
 288
 289 static const char *format_time(timestamp_t time, const char *tz_str,
 290                                int show_raw_time)
 291 {
 292         static struct strbuf time_buf = STRBUF_INIT;
 293
 294         strbuf_reset(&time_buf);
 295         if (show_raw_time) {
 296                 strbuf_addf(&time_buf, "%"PRItime" %s", time, tz_str);
 297         }
 298         else {
 299                 const char *time_str;
 300                 size_t time_width;
 301                 int tz;
 302                 tz = atoi(tz_str);
 303                 time_str = show_date(time, tz, &blame_date_mode);
 304                 strbuf_addstr(&time_buf, time_str);
 305                 /*
 306                  * Add space paddings to time_buf to display a fixed width
 307                  * string, and use time_width for display width calibration.
 308                  */
 309                 for (time_width = utf8_strwidth(time_str);
 310                      time_width < blame_date_width;
 311                      time_width++)
 312                         strbuf_addch(&time_buf, ' ');
 313         }
 314         return time_buf.buf;
 315 }
 316
 317 #define OUTPUT_ANNOTATE_COMPAT  001
 318 #define OUTPUT_LONG_OBJECT_NAME 002
 319 #define OUTPUT_RAW_TIMESTAMP    004
 320 #define OUTPUT_PORCELAIN        010
 321 #define OUTPUT_SHOW_NAME        020
 322 #define OUTPUT_SHOW_NUMBER      040
 323 #define OUTPUT_SHOW_SCORE       0100
 324 #define OUTPUT_NO_AUTHOR        0200
 325 #define OUTPUT_SHOW_EMAIL       0400
 326 #define OUTPUT_LINE_PORCELAIN   01000
 327 #define OUTPUT_COLOR_LINE       02000
 328 #define OUTPUT_SHOW_AGE_WITH_COLOR      04000
 329
 330 static void emit_porcelain_details(struct blame_origin *suspect, int repeat)
 331 {
 332         if (emit_one_suspect_detail(suspect, repeat) ||
 333             (suspect->commit->object.flags & MORE_THAN_ONE_PATH))
 334                 write_filename_info(suspect);
 335 }
 336
 337 static void emit_porcelain(struct blame_scoreboard *sb, struct blame_entry *ent,
 338                            int opt)
 339 {
 340         int repeat = opt & OUTPUT_LINE_PORCELAIN;
 341         int cnt;
 342         const char *cp;
 343         struct blame_origin *suspect = ent->suspect;
 344         char hex[GIT_MAX_HEXSZ + 1];
 345
 346         oid_to_hex_r(hex, &suspect->commit->object.oid);
 347         printf("%s %d %d %d\n",
 348                hex,
 349                ent->s_lno + 1,
 350                ent->lno + 1,
 351                ent->num_lines);
 352         emit_porcelain_details(suspect, repeat);
 353
 354         cp = blame_nth_line(sb, ent->lno);
 355         for (cnt = 0; cnt < ent->num_lines; cnt++) {
 356                 char ch;
 357                 if (cnt) {
 358                         printf("%s %d %d\n", hex,
 359                                ent->s_lno + 1 + cnt,
 360                                ent->lno + 1 + cnt);
 361                         if (repeat)
 362                                 emit_porcelain_details(suspect, 1);
 363                 }
 364                 putchar('\t');
 365                 do {
 366                         ch = *cp++;
 367                         putchar(ch);
 368                 } while (ch != '\n' &&
 369                          cp < sb->final_buf + sb->final_buf_size);
 370         }
 371
 372         if (sb->final_buf_size && cp[-1] != '\n')
 373                 putchar('\n');
 374 }
 375
 376 static struct color_field {
 377         timestamp_t hop;
 378         char col[COLOR_MAXLEN];
 379 } *colorfield;
 380 static int colorfield_nr, colorfield_alloc;
 381
 382 static void parse_color_fields(const char *s)
 383 {
 384         struct string_list l = STRING_LIST_INIT_DUP;
 385         struct string_list_item *item;
 386         enum { EXPECT_DATE, EXPECT_COLOR } next = EXPECT_COLOR;
 387
 388         colorfield_nr = 0;
 389
 390         /* Ideally this would be stripped and split at the same time? */
 391         string_list_split(&l, s, ',', -1);
 392         ALLOC_GROW(colorfield, colorfield_nr + 1, colorfield_alloc);
 393
 394         for_each_string_list_item(item, &l) {
 395                 switch (next) {
 396                 case EXPECT_DATE:
 397                         colorfield[colorfield_nr].hop = approxidate(item->string);
 398                         next = EXPECT_COLOR;
 399                         colorfield_nr++;
 400                         ALLOC_GROW(colorfield, colorfield_nr + 1, colorfield_alloc);
 401                         break;
 402                 case EXPECT_COLOR:
 403                         if (color_parse(item->string, colorfield[colorfield_nr].col))
 404                                 die(_("expecting a color: %s"), item->string);
 405                         next = EXPECT_DATE;
 406                         break;
 407                 }
 408         }
 409
 410         if (next == EXPECT_COLOR)
 411                 die (_("must end with a color"));
 412
 413         colorfield[colorfield_nr].hop = TIME_MAX;
 414         string_list_clear(&l, 0);
 415 }
 416
 417 static void setup_default_color_by_age(void)
 418 {
 419         parse_color_fields("blue,12 month ago,white,1 month ago,red");
 420 }
 421
 422 static void determine_line_heat(struct blame_entry *ent, const char **dest_color)
 423 {
 424         int i = 0;
 425         struct commit_info ci;
 426         get_commit_info(ent->suspect->commit, &ci, 1);
 427
 428         while (i < colorfield_nr && ci.author_time > colorfield[i].hop)
 429                 i++;
 430
 431         *dest_color = colorfield[i].col;
 432 }
 433
 434 static void emit_other(struct blame_scoreboard *sb, struct blame_entry *ent, int opt)
 435 {
 436         int cnt;
 437         const char *cp;
 438         struct blame_origin *suspect = ent->suspect;
 439         struct commit_info ci;
 440         char hex[GIT_MAX_HEXSZ + 1];
 441         int show_raw_time = !!(opt & OUTPUT_RAW_TIMESTAMP);
 442         const char *default_color = NULL, *color = NULL, *reset = NULL;
 443
 444         get_commit_info(suspect->commit, &ci, 1);
 445         oid_to_hex_r(hex, &suspect->commit->object.oid);
 446
 447         cp = blame_nth_line(sb, ent->lno);
 448
 449         if (opt & OUTPUT_SHOW_AGE_WITH_COLOR) {
 450                 determine_line_heat(ent, &default_color);
 451                 color = default_color;
 452                 reset = GIT_COLOR_RESET;
 453         }
 454
 455         for (cnt = 0; cnt < ent->num_lines; cnt++) {
 456                 char ch;
 457                 int length = (opt & OUTPUT_LONG_OBJECT_NAME) ? GIT_SHA1_HEXSZ : abbrev;
 458
 459                 if (opt & OUTPUT_COLOR_LINE) {
 460                         if (cnt > 0) {
 461                                 color = repeated_meta_color;
 462                                 reset = GIT_COLOR_RESET;
 463                         } else  {
 464                                 color = default_color ? default_color : NULL;
 465                                 reset = default_color ? GIT_COLOR_RESET : NULL;
 466                         }
 467                 }
 468                 if (color)
 469                         fputs(color, stdout);
 470
 471                 if (suspect->commit->object.flags & UNINTERESTING) {
 472                         if (blank_boundary)
 473                                 memset(hex, ' ', length);
 474                         else if (!(opt & OUTPUT_ANNOTATE_COMPAT)) {
 475                                 length--;
 476                                 putchar('^');
 477                         }
 478                 }
 479
 480                 printf("%.*s", length, hex);
 481                 if (opt & OUTPUT_ANNOTATE_COMPAT) {
 482                         const char *name;
 483                         if (opt & OUTPUT_SHOW_EMAIL)
 484                                 name = ci.author_mail.buf;
 485                         else
 486                                 name = ci.author.buf;
 487                         printf("\t(%10s\t%10s\t%d)", name,
 488                                format_time(ci.author_time, ci.author_tz.buf,
 489                                            show_raw_time),
 490                                ent->lno + 1 + cnt);
 491                 } else {
 492                         if (opt & OUTPUT_SHOW_SCORE)
 493                                 printf(" %*d %02d",
 494                                        max_score_digits, ent->score,
 495                                        ent->suspect->refcnt);
 496                         if (opt & OUTPUT_SHOW_NAME)
 497                                 printf(" %-*.*s", longest_file, longest_file,
 498                                        suspect->path);
 499                         if (opt & OUTPUT_SHOW_NUMBER)
 500                                 printf(" %*d", max_orig_digits,
 501                                        ent->s_lno + 1 + cnt);
 502
 503                         if (!(opt & OUTPUT_NO_AUTHOR)) {
 504                                 const char *name;
 505                                 int pad;
 506                                 if (opt & OUTPUT_SHOW_EMAIL)
 507                                         name = ci.author_mail.buf;
 508                                 else
 509                                         name = ci.author.buf;
 510                                 pad = longest_author - utf8_strwidth(name);
 511                                 printf(" (%s%*s %10s",
 512                                        name, pad, "",
 513                                        format_time(ci.author_time,
 514                                                    ci.author_tz.buf,
 515                                                    show_raw_time));
 516                         }
 517                         printf(" %*d) ",
 518                                max_digits, ent->lno + 1 + cnt);
 519                 }
 520                 if (reset)
 521                         fputs(reset, stdout);
 522                 do {
 523                         ch = *cp++;
 524                         putchar(ch);
 525                 } while (ch != '\n' &&
 526                          cp < sb->final_buf + sb->final_buf_size);
 527         }
 528
 529         if (sb->final_buf_size && cp[-1] != '\n')
 530                 putchar('\n');
 531
 532         commit_info_destroy(&ci);
 533 }
 534
 535 static void output(struct blame_scoreboard *sb, int option)
 536 {
 537         struct blame_entry *ent;
 538
 539         if (option & OUTPUT_PORCELAIN) {
 540                 for (ent = sb->ent; ent; ent = ent->next) {
 541                         int count = 0;
 542                         struct blame_origin *suspect;
 543                         struct commit *commit = ent->suspect->commit;
 544                         if (commit->object.flags & MORE_THAN_ONE_PATH)
 545                                 continue;
 546                         for (suspect = get_blame_suspects(commit); suspect; suspect = suspect->next) {
 547                                 if (suspect->guilty && count++) {
 548                                         commit->object.flags |= MORE_THAN_ONE_PATH;
 549                                         break;
 550                                 }
 551                         }
 552                 }
 553         }
 554
 555         for (ent = sb->ent; ent; ent = ent->next) {
 556                 if (option & OUTPUT_PORCELAIN)
 557                         emit_porcelain(sb, ent, option);
 558                 else {
 559                         emit_other(sb, ent, option);
 560                 }
 561         }
 562 }
 563
 564 /*
 565  * Add phony grafts for use with -S; this is primarily to
 566  * support git's cvsserver that wants to give a linear history
 567  * to its clients.
 568  */
 569 static int read_ancestry(const char *graft_file)
 570 {
 571         FILE *fp = fopen_or_warn(graft_file, "r");
 572         struct strbuf buf = STRBUF_INIT;
 573         if (!fp)
 574                 return -1;
 575         while (!strbuf_getwholeline(&buf, fp, '\n')) {
 576                 /* The format is just "Commit Parent1 Parent2 ...\n" */
 577                 struct commit_graft *graft = read_graft_line(&buf);
 578                 if (graft)
 579                         register_commit_graft(graft, 0);
 580         }
 581         fclose(fp);
 582         strbuf_release(&buf);
 583         return 0;
 584 }
 585
 586 static int update_auto_abbrev(int auto_abbrev, struct blame_origin *suspect)
 587 {
 588         const char *uniq = find_unique_abbrev(&suspect->commit->object.oid,
 589                                               auto_abbrev);
 590         int len = strlen(uniq);
 591         if (auto_abbrev < len)
 592                 return len;
 593         return auto_abbrev;
 594 }
 595
 596 /*
 597  * How many columns do we need to show line numbers, authors,
 598  * and filenames?
 599  */
 600 static void find_alignment(struct blame_scoreboard *sb, int *option)
 601 {
 602         int longest_src_lines = 0;
 603         int longest_dst_lines = 0;
 604         unsigned largest_score = 0;
 605         struct blame_entry *e;
 606         int compute_auto_abbrev = (abbrev < 0);
 607         int auto_abbrev = DEFAULT_ABBREV;
 608
 609         for (e = sb->ent; e; e = e->next) {
 610                 struct blame_origin *suspect = e->suspect;
 611                 int num;
 612
 613                 if (compute_auto_abbrev)
 614                         auto_abbrev = update_auto_abbrev(auto_abbrev, suspect);
 615                 if (strcmp(suspect->path, sb->path))
 616                         *option |= OUTPUT_SHOW_NAME;
 617                 num = strlen(suspect->path);
 618                 if (longest_file < num)
 619                         longest_file = num;
 620                 if (!(suspect->commit->object.flags & METAINFO_SHOWN)) {
 621                         struct commit_info ci;
 622                         suspect->commit->object.flags |= METAINFO_SHOWN;
 623                         get_commit_info(suspect->commit, &ci, 1);
 624                         if (*option & OUTPUT_SHOW_EMAIL)
 625                                 num = utf8_strwidth(ci.author_mail.buf);
 626                         else
 627                                 num = utf8_strwidth(ci.author.buf);
 628                         if (longest_author < num)
 629                                 longest_author = num;
 630                         commit_info_destroy(&ci);
 631                 }
 632                 num = e->s_lno + e->num_lines;
 633                 if (longest_src_lines < num)
 634                         longest_src_lines = num;
 635                 num = e->lno + e->num_lines;
 636                 if (longest_dst_lines < num)
 637                         longest_dst_lines = num;
 638                 if (largest_score < blame_entry_score(sb, e))
 639                         largest_score = blame_entry_score(sb, e);
 640         }
 641         max_orig_digits = decimal_width(longest_src_lines);
 642         max_digits = decimal_width(longest_dst_lines);
 643         max_score_digits = decimal_width(largest_score);
 644
 645         if (compute_auto_abbrev)
 646                 /* one more abbrev length is needed for the boundary commit */
 647                 abbrev = auto_abbrev + 1;
 648 }
 649
 650 static void sanity_check_on_fail(struct blame_scoreboard *sb, int baa)
 651 {
 652         int opt = OUTPUT_SHOW_SCORE | OUTPUT_SHOW_NUMBER | OUTPUT_SHOW_NAME;
 653         find_alignment(sb, &opt);
 654         output(sb, opt);
 655         die("Baa %d!", baa);
 656 }
 657
 658 static unsigned parse_score(const char *arg)
 659 {
 660         char *end;
 661         unsigned long score = strtoul(arg, &end, 10);
 662         if (*end)
 663                 return 0;
 664         return score;
 665 }
 666
 667 static const char *add_prefix(const char *prefix, const char *path)
 668 {
 669         return prefix_path(prefix, prefix ? strlen(prefix) : 0, path);
 670 }
 671
 672 static int git_blame_config(const char *var, const char *value, void *cb)
 673 {
 674         if (!strcmp(var, "blame.showroot")) {
 675                 show_root = git_config_bool(var, value);
 676                 return 0;
 677         }
 678         if (!strcmp(var, "blame.blankboundary")) {
 679                 blank_boundary = git_config_bool(var, value);
 680                 return 0;
 681         }
 682         if (!strcmp(var, "blame.showemail")) {
 683                 int *output_option = cb;
 684                 if (git_config_bool(var, value))
 685                         *output_option |= OUTPUT_SHOW_EMAIL;
 686                 else
 687                         *output_option &= ~OUTPUT_SHOW_EMAIL;
 688                 return 0;
 689         }
 690         if (!strcmp(var, "blame.date")) {
 691                 if (!value)
 692                         return config_error_nonbool(var);
 693                 parse_date_format(value, &blame_date_mode);
 694                 return 0;
 695         }
 696         if (!strcmp(var, "color.blame.repeatedlines")) {
 697                 if (color_parse_mem(value, strlen(value), repeated_meta_color))
 698                         warning(_("invalid color '%s' in color.blame.repeatedLines"),
 699                                 value);
 700                 return 0;
 701         }
 702         if (!strcmp(var, "color.blame.highlightrecent")) {
 703                 parse_color_fields(value);
 704                 return 0;
 705         }
 706
 707         if (!strcmp(var, "blame.coloring")) {
 708                 if (!strcmp(value, "repeatedLines")) {
 709                         coloring_mode |= OUTPUT_COLOR_LINE;
 710                 } else if (!strcmp(value, "highlightRecent")) {
 711                         coloring_mode |= OUTPUT_SHOW_AGE_WITH_COLOR;
 712                 } else if (!strcmp(value, "none")) {
 713                         coloring_mode &= ~(OUTPUT_COLOR_LINE |
 714                                             OUTPUT_SHOW_AGE_WITH_COLOR);
 715                 } else {
 716                         warning(_("invalid value for blame.coloring"));
 717                         return 0;
 718                 }
 719         }
 720
 721         if (git_diff_heuristic_config(var, value, cb) < 0)
 722                 return -1;
 723         if (userdiff_config(var, value) < 0)
 724                 return -1;
 725
 726         return git_default_config(var, value, cb);
 727 }
 728
 729 static int blame_copy_callback(const struct option *option, const char *arg, int unset)
 730 {
 731         int *opt = option->value;
 732
 733         /*
 734          * -C enables copy from removed files;
 735          * -C -C enables copy from existing files, but only
 736          *       when blaming a new file;
 737          * -C -C -C enables copy from existing files for
 738          *          everybody
 739          */
 740         if (*opt & PICKAXE_BLAME_COPY_HARDER)
 741                 *opt |= PICKAXE_BLAME_COPY_HARDEST;
 742         if (*opt & PICKAXE_BLAME_COPY)
 743                 *opt |= PICKAXE_BLAME_COPY_HARDER;
 744         *opt |= PICKAXE_BLAME_COPY | PICKAXE_BLAME_MOVE;
 745
 746         if (arg)
 747                 blame_copy_score = parse_score(arg);
 748         return 0;
 749 }
 750
 751 static int blame_move_callback(const struct option *option, const char *arg, int unset)
 752 {
 753         int *opt = option->value;
 754
 755         *opt |= PICKAXE_BLAME_MOVE;
 756
 757         if (arg)
 758                 blame_move_score = parse_score(arg);
 759         return 0;
 760 }
 761
 762 static int is_a_rev(const char *name)
 763 {
 764         struct object_id oid;
 765
 766         if (get_oid(name, &oid))
 767                 return 0;
 768         return OBJ_NONE < oid_object_info(the_repository, &oid, NULL);
 769 }
 770
 771 int cmd_blame(int argc, const char **argv, const char *prefix)
 772 {
 773         struct rev_info revs;
 774         const char *path;
 775         struct blame_scoreboard sb;
 776         struct blame_origin *o;
 777         struct blame_entry *ent = NULL;
 778         long dashdash_pos, lno;
 779         struct progress_info pi = { NULL, 0 };
 780
 781         struct string_list range_list = STRING_LIST_INIT_NODUP;
 782         int output_option = 0, opt = 0;
 783         int show_stats = 0;
 784         const char *revs_file = NULL;
 785         const char *contents_from = NULL;
 786         const struct option options[] = {
 787                 OPT_BOOL(0, "incremental", &incremental, N_("Show blame entries as we find them, incrementally")),
 788                 OPT_BOOL('b', NULL, &blank_boundary, N_("Show blank SHA-1 for boundary commits (Default: off)")),
 789                 OPT_BOOL(0, "root", &show_root, N_("Do not treat root commits as boundaries (Default: off)")),
 790                 OPT_BOOL(0, "show-stats", &show_stats, N_("Show work cost statistics")),
 791                 OPT_BOOL(0, "progress", &show_progress, N_("Force progress reporting")),
 792                 OPT_BIT(0, "score-debug", &output_option, N_("Show output score for blame entries"), OUTPUT_SHOW_SCORE),
 793                 OPT_BIT('f', "show-name", &output_option, N_("Show original filename (Default: auto)"), OUTPUT_SHOW_NAME),
 794                 OPT_BIT('n', "show-number", &output_option, N_("Show original linenumber (Default: off)"), OUTPUT_SHOW_NUMBER),
 795                 OPT_BIT('p', "porcelain", &output_option, N_("Show in a format designed for machine consumption"), OUTPUT_PORCELAIN),
 796                 OPT_BIT(0, "line-porcelain", &output_option, N_("Show porcelain format with per-line commit information"), OUTPUT_PORCELAIN|OUTPUT_LINE_PORCELAIN),
 797                 OPT_BIT('c', NULL, &output_option, N_("Use the same output mode as git-annotate (Default: off)"), OUTPUT_ANNOTATE_COMPAT),
 798                 OPT_BIT('t', NULL, &output_option, N_("Show raw timestamp (Default: off)"), OUTPUT_RAW_TIMESTAMP),
 799                 OPT_BIT('l', NULL, &output_option, N_("Show long commit SHA1 (Default: off)"), OUTPUT_LONG_OBJECT_NAME),
 800                 OPT_BIT('s', NULL, &output_option, N_("Suppress author name and timestamp (Default: off)"), OUTPUT_NO_AUTHOR),
 801                 OPT_BIT('e', "show-email", &output_option, N_("Show author email instead of name (Default: off)"), OUTPUT_SHOW_EMAIL),
 802                 OPT_BIT('w', NULL, &xdl_opts, N_("Ignore whitespace differences"), XDF_IGNORE_WHITESPACE),
 803                 OPT_BIT(0, "color-lines", &output_option, N_("color redundant metadata from previous line differently"), OUTPUT_COLOR_LINE),
 804                 OPT_BIT(0, "color-by-age", &output_option, N_("color lines by age"), OUTPUT_SHOW_AGE_WITH_COLOR),
 805
 806                 /*
 807                  * The following two options are parsed by parse_revision_opt()
 808                  * and are only included here to get included in the "-h"
 809                  * output:
 810                  */
 811                 { OPTION_LOWLEVEL_CALLBACK, 0, "indent-heuristic", NULL, NULL, N_("Use an experimental heuristic to improve diffs"), PARSE_OPT_NOARG, parse_opt_unknown_cb },
 812
 813                 OPT_BIT(0, "minimal", &xdl_opts, N_("Spend extra cycles to find better match"), XDF_NEED_MINIMAL),
 814                 OPT_STRING('S', NULL, &revs_file, N_("file"), N_("Use revisions from <file> instead of calling git-rev-list")),
 815                 OPT_STRING(0, "contents", &contents_from, N_("file"), N_("Use <file>'s contents as the final image")),
 816                 { OPTION_CALLBACK, 'C', NULL, &opt, N_("score"), N_("Find line copies within and across files"), PARSE_OPT_OPTARG, blame_copy_callback },
 817                 { OPTION_CALLBACK, 'M', NULL, &opt, N_("score"), N_("Find line movements within and across files"), PARSE_OPT_OPTARG, blame_move_callback },
 818                 OPT_STRING_LIST('L', NULL, &range_list, N_("n,m"), N_("Process only line range n,m, counting from 1")),
 819                 OPT__ABBREV(&abbrev),
 820                 OPT_END()
 821         };
 822
 823         struct parse_opt_ctx_t ctx;
 824         int cmd_is_annotate = !strcmp(argv[0], "annotate");
 825         struct range_set ranges;
 826         unsigned int range_i;
 827         long anchor;
 828
 829         setup_default_color_by_age();
 830         git_config(git_blame_config, &output_option);
 831         init_revisions(&revs, NULL);
 832         revs.date_mode = blame_date_mode;
 833         revs.diffopt.flags.allow_textconv = 1;
 834         revs.diffopt.flags.follow_renames = 1;
 835
 836         save_commit_buffer = 0;
 837         dashdash_pos = 0;
 838         show_progress = -1;
 839
 840         parse_options_start(&ctx, argc, argv, prefix, options,
 841                             PARSE_OPT_KEEP_DASHDASH | PARSE_OPT_KEEP_ARGV0);
 842         for (;;) {
 843                 switch (parse_options_step(&ctx, options, blame_opt_usage)) {
 844                 case PARSE_OPT_HELP:
 845                 case PARSE_OPT_ERROR:
 846                         exit(129);
 847                 case PARSE_OPT_DONE:
 848                         if (ctx.argv[0])
 849                                 dashdash_pos = ctx.cpidx;
 850                         goto parse_done;
 851                 }
 852
 853                 if (!strcmp(ctx.argv[0], "--reverse")) {
 854                         ctx.argv[0] = "--children";
 855                         reverse = 1;
 856                 }
 857                 parse_revision_opt(&revs, &ctx, options, blame_opt_usage);
 858         }
 859 parse_done:
 860         no_whole_file_rename = !revs.diffopt.flags.follow_renames;
 861         xdl_opts |= revs.diffopt.xdl_opts & XDF_INDENT_HEURISTIC;
 862         revs.diffopt.flags.follow_renames = 0;
 863         argc = parse_options_end(&ctx);
 864
 865         if (incremental || (output_option & OUTPUT_PORCELAIN)) {
 866                 if (show_progress > 0)
 867                         die(_("--progress can't be used with --incremental or porcelain formats"));
 868                 show_progress = 0;
 869         } else if (show_progress < 0)
 870                 show_progress = isatty(2);
 871
 872         if (0 < abbrev && abbrev < GIT_SHA1_HEXSZ)
 873                 /* one more abbrev length is needed for the boundary commit */
 874                 abbrev++;
 875         else if (!abbrev)
 876                 abbrev = GIT_SHA1_HEXSZ;
 877
 878         if (revs_file && read_ancestry(revs_file))
 879                 die_errno("reading graft file '%s' failed", revs_file);
 880
 881         if (cmd_is_annotate) {
 882                 output_option |= OUTPUT_ANNOTATE_COMPAT;
 883                 blame_date_mode.type = DATE_ISO8601;
 884         } else {
 885                 blame_date_mode = revs.date_mode;
 886         }
 887
 888         /* The maximum width used to show the dates */
 889         switch (blame_date_mode.type) {
 890         case DATE_RFC2822:
 891                 blame_date_width = sizeof("Thu, 19 Oct 2006 16:00:04 -0700");
 892                 break;
 893         case DATE_ISO8601_STRICT:
 894                 blame_date_width = sizeof("2006-10-19T16:00:04-07:00");
 895                 break;
 896         case DATE_ISO8601:
 897                 blame_date_width = sizeof("2006-10-19 16:00:04 -0700");
 898                 break;
 899         case DATE_RAW:
 900                 blame_date_width = sizeof("1161298804 -0700");
 901                 break;
 902         case DATE_UNIX:
 903                 blame_date_width = sizeof("1161298804");
 904                 break;
 905         case DATE_SHORT:
 906                 blame_date_width = sizeof("2006-10-19");
 907                 break;
 908         case DATE_RELATIVE:
 909                 /*
 910                  * TRANSLATORS: This string is used to tell us the
 911                  * maximum display width for a relative timestamp in
 912                  * "git blame" output.  For C locale, "4 years, 11
 913                  * months ago", which takes 22 places, is the longest
 914                  * among various forms of relative timestamps, but
 915                  * your language may need more or fewer display
 916                  * columns.
 917                  */
 918                 blame_date_width = utf8_strwidth(_("4 years, 11 months ago")) + 1; /* add the null */
 919                 break;
 920         case DATE_NORMAL:
 921                 blame_date_width = sizeof("Thu Oct 19 16:00:04 2006 -0700");
 922                 break;
 923         case DATE_STRFTIME:
 924                 blame_date_width = strlen(show_date(0, 0, &blame_date_mode)) + 1; /* add the null */
 925                 break;
 926         }
 927         blame_date_width -= 1; /* strip the null */
 928
 929         if (revs.diffopt.flags.find_copies_harder)
 930                 opt |= (PICKAXE_BLAME_COPY | PICKAXE_BLAME_MOVE |
 931                         PICKAXE_BLAME_COPY_HARDER);
 932
 933         /*
 934          * We have collected options unknown to us in argv[1..unk]
 935          * which are to be passed to revision machinery if we are
 936          * going to do the "bottom" processing.
 937          *
 938          * The remaining are:
 939          *
 940          * (1) if dashdash_pos != 0, it is either
 941          *     "blame [revisions] -- <path>" or
 942          *     "blame -- <path> <rev>"
 943          *
 944          * (2) otherwise, it is one of the two:
 945          *     "blame [revisions] <path>"
 946          *     "blame <path> <rev>"
 947          *
 948          * Note that we must strip out <path> from the arguments: we do not
 949          * want the path pruning but we may want "bottom" processing.
 950          */
 951         if (dashdash_pos) {
 952                 switch (argc - dashdash_pos - 1) {
 953                 case 2: /* (1b) */
 954                         if (argc != 4)
 955                                 usage_with_options(blame_opt_usage, options);
 956                         /* reorder for the new way: <rev> -- <path> */
 957                         argv[1] = argv[3];
 958                         argv[3] = argv[2];
 959                         argv[2] = "--";
 960                         /* FALLTHROUGH */
 961                 case 1: /* (1a) */
 962                         path = add_prefix(prefix, argv[--argc]);
 963                         argv[argc] = NULL;
 964                         break;
 965                 default:
 966                         usage_with_options(blame_opt_usage, options);
 967                 }
 968         } else {
 969                 if (argc < 2)
 970                         usage_with_options(blame_opt_usage, options);
 971                 if (argc == 3 && is_a_rev(argv[argc - 1])) { /* (2b) */
 972                         path = add_prefix(prefix, argv[1]);
 973                         argv[1] = argv[2];
 974                 } else {        /* (2a) */
 975                         if (argc == 2 && is_a_rev(argv[1]) && !get_git_work_tree())
 976                                 die("missing <path> to blame");
 977                         path = add_prefix(prefix, argv[argc - 1]);
 978                 }
 979                 argv[argc - 1] = "--";
 980         }
 981
 982         revs.disable_stdin = 1;
 983         setup_revisions(argc, argv, &revs, NULL);
 984
 985         init_scoreboard(&sb);
 986         sb.revs = &revs;
 987         sb.contents_from = contents_from;
 988         sb.reverse = reverse;
 989         setup_scoreboard(&sb, path, &o);
 990         lno = sb.num_lines;
 991
 992         if (lno && !range_list.nr)
 993                 string_list_append(&range_list, "1");
 994
 995         anchor = 1;
 996         range_set_init(&ranges, range_list.nr);
 997         for (range_i = 0; range_i < range_list.nr; ++range_i) {
 998                 long bottom, top;
 999                 if (parse_range_arg(range_list.items[range_i].string,
1000                                     nth_line_cb, &sb, lno, anchor,
1001                                     &bottom, &top, sb.path))
1002                         usage(blame_usage);
1003                 if (lno < top || ((lno || bottom) && lno < bottom))
1004                         die(Q_("file %s has only %lu line",
1005                                "file %s has only %lu lines",
1006                                lno), path, lno);
1007                 if (bottom < 1)
1008                         bottom = 1;
1009                 if (top < 1)
1010                         top = lno;
1011                 bottom--;
1012                 range_set_append_unsafe(&ranges, bottom, top);
1013                 anchor = top + 1;
1014         }
1015         sort_and_merge_range_set(&ranges);
1016
1017         for (range_i = ranges.nr; range_i > 0; --range_i) {
1018                 const struct range *r = &ranges.ranges[range_i - 1];
1019                 ent = blame_entry_prepend(ent, r->start, r->end, o);
1020         }
1021
1022         o->suspects = ent;
1023         prio_queue_put(&sb.commits, o->commit);
1024
1025         blame_origin_decref(o);
1026
1027         range_set_release(&ranges);
1028         string_list_clear(&range_list, 0);
1029
1030         sb.ent = NULL;
1031         sb.path = path;
1032
1033         if (blame_move_score)
1034                 sb.move_score = blame_move_score;
1035         if (blame_copy_score)
1036                 sb.copy_score = blame_copy_score;
1037
1038         sb.debug = DEBUG;
1039         sb.on_sanity_fail = &sanity_check_on_fail;
1040
1041         sb.show_root = show_root;
1042         sb.xdl_opts = xdl_opts;
1043         sb.no_whole_file_rename = no_whole_file_rename;
1044
1045         read_mailmap(&mailmap, NULL);
1046
1047         sb.found_guilty_entry = &found_guilty_entry;
1048         sb.found_guilty_entry_data = &pi;
1049         if (show_progress)
1050                 pi.progress = start_delayed_progress(_("Blaming lines"), sb.num_lines);
1051
1052         assign_blame(&sb, opt);
1053
1054         stop_progress(&pi.progress);
1055
1056         if (!incremental)
1057                 setup_pager();
1058         else
1059                 return 0;
1060
1061         blame_sort_final(&sb);
1062
1063         blame_coalesce(&sb);
1064
1065         if (!(output_option & (OUTPUT_COLOR_LINE | OUTPUT_SHOW_AGE_WITH_COLOR)))
1066                 output_option |= coloring_mode;
1067
1068         if (!(output_option & OUTPUT_PORCELAIN)) {
1069                 find_alignment(&sb, &output_option);
1070                 if (!*repeated_meta_color &&
1071                     (output_option & OUTPUT_COLOR_LINE))
1072                         strcpy(repeated_meta_color, GIT_COLOR_CYAN);
1073         }
1074         if (output_option & OUTPUT_ANNOTATE_COMPAT)
1075                 output_option &= ~(OUTPUT_COLOR_LINE | OUTPUT_SHOW_AGE_WITH_COLOR);
1076
1077         output(&sb, output_option);
1078         free((void *)sb.final_buf);
1079         for (ent = sb.ent; ent; ) {
1080                 struct blame_entry *e = ent->next;
1081                 free(ent);
1082                 ent = e;
1083         }
1084
1085         if (show_stats) {
1086                 printf("num read blob: %d\n", sb.num_read_blob);
1087                 printf("num get patch: %d\n", sb.num_get_patch);
1088                 printf("num commits: %d\n", sb.num_commits);
1089         }
1090         return 0;
1091 }