git.oblomov.eu Git - git/blob - blame.c

   1 /*
   2  * Copyright (C) 2006, Fredrik Kuivinen <freku045@student.liu.se>
   3  */
   4
   5 #include <assert.h>
   6 #include <time.h>
   7 #include <sys/time.h>
   8 #include <math.h>
   9
  10 #include "cache.h"
  11 #include "refs.h"
  12 #include "tag.h"
  13 #include "commit.h"
  14 #include "tree.h"
  15 #include "blob.h"
  16 #include "diff.h"
  17 #include "diffcore.h"
  18 #include "revision.h"
  19 #include "xdiff-interface.h"
  20
  21 #define DEBUG 0
  22
  23 static const char blame_usage[] = "git-blame [-c] [-l] [-t] [-S <revs-file>] [--] file [commit]\n"
  24         "  -c, --compatibility Use the same output mode as git-annotate (Default: off)\n"
  25         "  -l, --long          Show long commit SHA1 (Default: off)\n"
  26         "  -t, --time          Show raw timestamp (Default: off)\n"
  27         "  -S, --revs-file     Use revisions from revs-file instead of calling git-rev-list\n"
  28         "  -h, --help          This message";
  29
  30 static struct commit **blame_lines;
  31 static int num_blame_lines;
  32 static char* blame_contents;
  33 static int blame_len;
  34
  35 struct util_info {
  36         int *line_map;
  37         unsigned char sha1[20]; /* blob sha, not commit! */
  38         char *buf;
  39         unsigned long size;
  40         int num_lines;
  41         const char* pathname;
  42
  43         void* topo_data;
  44 };
  45
  46 struct chunk {
  47         int off1, len1; /* --- */
  48         int off2, len2; /* +++ */
  49 };
  50
  51 struct patch {
  52         struct chunk *chunks;
  53         int num;
  54 };
  55
  56 static void get_blob(struct commit *commit);
  57
  58 /* Only used for statistics */
  59 static int num_get_patch = 0;
  60 static int num_commits = 0;
  61 static int patch_time = 0;
  62
  63 struct blame_diff_state {
  64         struct xdiff_emit_state xm;
  65         struct patch *ret;
  66 };
  67
  68 static void process_u0_diff(void *state_, char *line, unsigned long len)
  69 {
  70         struct blame_diff_state *state = state_;
  71         struct chunk *chunk;
  72
  73         if (len < 4 || line[0] != '@' || line[1] != '@')
  74                 return;
  75
  76         if (DEBUG)
  77                 printf("chunk line: %.*s", (int)len, line);
  78         state->ret->num++;
  79         state->ret->chunks = xrealloc(state->ret->chunks,
  80                                       sizeof(struct chunk) * state->ret->num);
  81         chunk = &state->ret->chunks[state->ret->num - 1];
  82
  83         assert(!strncmp(line, "@@ -", 4));
  84
  85         if (parse_hunk_header(line, len,
  86                               &chunk->off1, &chunk->len1,
  87                               &chunk->off2, &chunk->len2)) {
  88                 state->ret->num--;
  89                 return;
  90         }
  91
  92         if (chunk->len1 == 0)
  93                 chunk->off1++;
  94         if (chunk->len2 == 0)
  95                 chunk->off2++;
  96
  97         if (chunk->off1 > 0)
  98                 chunk->off1--;
  99         if (chunk->off2 > 0)
 100                 chunk->off2--;
 101
 102         assert(chunk->off1 >= 0);
 103         assert(chunk->off2 >= 0);
 104 }
 105
 106 static struct patch *get_patch(struct commit *commit, struct commit *other)
 107 {
 108         struct blame_diff_state state;
 109         xpparam_t xpp;
 110         xdemitconf_t xecfg;
 111         mmfile_t file_c, file_o;
 112         xdemitcb_t ecb;
 113         struct util_info *info_c = (struct util_info *)commit->util;
 114         struct util_info *info_o = (struct util_info *)other->util;
 115         struct timeval tv_start, tv_end;
 116
 117         get_blob(commit);
 118         file_c.ptr = info_c->buf;
 119         file_c.size = info_c->size;
 120
 121         get_blob(other);
 122         file_o.ptr = info_o->buf;
 123         file_o.size = info_o->size;
 124
 125         gettimeofday(&tv_start, NULL);
 126
 127         xpp.flags = XDF_NEED_MINIMAL;
 128         xecfg.ctxlen = 0;
 129         xecfg.flags = 0;
 130         ecb.outf = xdiff_outf;
 131         ecb.priv = &state;
 132         memset(&state, 0, sizeof(state));
 133         state.xm.consume = process_u0_diff;
 134         state.ret = xmalloc(sizeof(struct patch));
 135         state.ret->chunks = NULL;
 136         state.ret->num = 0;
 137
 138         xdl_diff(&file_c, &file_o, &xpp, &xecfg, &ecb);
 139
 140         gettimeofday(&tv_end, NULL);
 141         patch_time += 1000000 * (tv_end.tv_sec - tv_start.tv_sec) +
 142                 tv_end.tv_usec - tv_start.tv_usec;
 143
 144         num_get_patch++;
 145         return state.ret;
 146 }
 147
 148 static void free_patch(struct patch *p)
 149 {
 150         free(p->chunks);
 151         free(p);
 152 }
 153
 154 static int get_blob_sha1_internal(const unsigned char *sha1, const char *base,
 155                                   int baselen, const char *pathname,
 156                                   unsigned mode, int stage);
 157
 158 static unsigned char blob_sha1[20];
 159 static const char* blame_file;
 160 static int get_blob_sha1(struct tree *t, const char *pathname,
 161                          unsigned char *sha1)
 162 {
 163         int i;
 164         const char *pathspec[2];
 165         blame_file = pathname;
 166         pathspec[0] = pathname;
 167         pathspec[1] = NULL;
 168         memset(blob_sha1, 0, sizeof(blob_sha1));
 169         read_tree_recursive(t, "", 0, 0, pathspec, get_blob_sha1_internal);
 170
 171         for (i = 0; i < 20; i++) {
 172                 if (blob_sha1[i] != 0)
 173                         break;
 174         }
 175
 176         if (i == 20)
 177                 return -1;
 178
 179         memcpy(sha1, blob_sha1, 20);
 180         return 0;
 181 }
 182
 183 static int get_blob_sha1_internal(const unsigned char *sha1, const char *base,
 184                                   int baselen, const char *pathname,
 185                                   unsigned mode, int stage)
 186 {
 187         if (S_ISDIR(mode))
 188                 return READ_TREE_RECURSIVE;
 189
 190         if (strncmp(blame_file, base, baselen) ||
 191             strcmp(blame_file + baselen, pathname))
 192                 return -1;
 193
 194         memcpy(blob_sha1, sha1, 20);
 195         return -1;
 196 }
 197
 198 static void get_blob(struct commit *commit)
 199 {
 200         struct util_info *info = commit->util;
 201         char type[20];
 202
 203         if (info->buf)
 204                 return;
 205
 206         info->buf = read_sha1_file(info->sha1, type, &info->size);
 207
 208         assert(!strcmp(type, blob_type));
 209 }
 210
 211 /* For debugging only */
 212 static void print_patch(struct patch *p)
 213 {
 214         int i;
 215         printf("Num chunks: %d\n", p->num);
 216         for (i = 0; i < p->num; i++) {
 217                 printf("%d,%d %d,%d\n", p->chunks[i].off1, p->chunks[i].len1,
 218                        p->chunks[i].off2, p->chunks[i].len2);
 219         }
 220 }
 221
 222 #if DEBUG
 223 /* For debugging only */
 224 static void print_map(struct commit *cmit, struct commit *other)
 225 {
 226         struct util_info *util = cmit->util;
 227         struct util_info *util2 = other->util;
 228
 229         int i;
 230         int max =
 231             util->num_lines >
 232             util2->num_lines ? util->num_lines : util2->num_lines;
 233         int num;
 234
 235         for (i = 0; i < max; i++) {
 236                 printf("i: %d ", i);
 237                 num = -1;
 238
 239                 if (i < util->num_lines) {
 240                         num = util->line_map[i];
 241                         printf("%d\t", num);
 242                 } else
 243                         printf("\t");
 244
 245                 if (i < util2->num_lines) {
 246                         int num2 = util2->line_map[i];
 247                         printf("%d\t", num2);
 248                         if (num != -1 && num2 != num)
 249                                 printf("---");
 250                 } else
 251                         printf("\t");
 252
 253                 printf("\n");
 254         }
 255 }
 256 #endif
 257
 258 /* p is a patch from commit to other. */
 259 static void fill_line_map(struct commit *commit, struct commit *other,
 260                           struct patch *p)
 261 {
 262         struct util_info *util = commit->util;
 263         struct util_info *util2 = other->util;
 264         int *map = util->line_map;
 265         int *map2 = util2->line_map;
 266         int cur_chunk = 0;
 267         int i1, i2;
 268
 269         if (p->num && DEBUG)
 270                 print_patch(p);
 271
 272         if (DEBUG)
 273                 printf("num lines 1: %d num lines 2: %d\n", util->num_lines,
 274                        util2->num_lines);
 275
 276         for (i1 = 0, i2 = 0; i1 < util->num_lines; i1++, i2++) {
 277                 struct chunk *chunk = NULL;
 278                 if (cur_chunk < p->num)
 279                         chunk = &p->chunks[cur_chunk];
 280
 281                 if (chunk && chunk->off1 == i1) {
 282                         if (DEBUG && i2 != chunk->off2)
 283                                 printf("i2: %d off2: %d\n", i2, chunk->off2);
 284
 285                         assert(i2 == chunk->off2);
 286
 287                         i1--;
 288                         i2--;
 289                         if (chunk->len1 > 0)
 290                                 i1 += chunk->len1;
 291
 292                         if (chunk->len2 > 0)
 293                                 i2 += chunk->len2;
 294
 295                         cur_chunk++;
 296                 } else {
 297                         if (i2 >= util2->num_lines)
 298                                 break;
 299
 300                         if (map[i1] != map2[i2] && map[i1] != -1) {
 301                                 if (DEBUG)
 302                                         printf("map: i1: %d %d %p i2: %d %d %p\n",
 303                                                i1, map[i1],
 304                                                (void *) (i1 != -1 ? blame_lines[map[i1]] : NULL),
 305                                                i2, map2[i2],
 306                                                (void *) (i2 != -1 ? blame_lines[map2[i2]] : NULL));
 307                                 if (map2[i2] != -1 &&
 308                                     blame_lines[map[i1]] &&
 309                                     !blame_lines[map2[i2]])
 310                                         map[i1] = map2[i2];
 311                         }
 312
 313                         if (map[i1] == -1 && map2[i2] != -1)
 314                                 map[i1] = map2[i2];
 315                 }
 316
 317                 if (DEBUG > 1)
 318                         printf("l1: %d l2: %d i1: %d i2: %d\n",
 319                                map[i1], map2[i2], i1, i2);
 320         }
 321 }
 322
 323 static int map_line(struct commit *commit, int line)
 324 {
 325         struct util_info *info = commit->util;
 326         assert(line >= 0 && line < info->num_lines);
 327         return info->line_map[line];
 328 }
 329
 330 static struct util_info* get_util(struct commit *commit)
 331 {
 332         struct util_info *util = commit->util;
 333
 334         if (util)
 335                 return util;
 336
 337         util = xmalloc(sizeof(struct util_info));
 338         util->buf = NULL;
 339         util->size = 0;
 340         util->line_map = NULL;
 341         util->num_lines = -1;
 342         util->pathname = NULL;
 343         commit->util = util;
 344         return util;
 345 }
 346
 347 static int fill_util_info(struct commit *commit)
 348 {
 349         struct util_info *util = commit->util;
 350
 351         assert(util);
 352         assert(util->pathname);
 353
 354         if (get_blob_sha1(commit->tree, util->pathname, util->sha1))
 355                 return 1;
 356         else
 357                 return 0;
 358 }
 359
 360 static void alloc_line_map(struct commit *commit)
 361 {
 362         struct util_info *util = commit->util;
 363         int i;
 364
 365         if (util->line_map)
 366                 return;
 367
 368         get_blob(commit);
 369
 370         util->num_lines = 0;
 371         for (i = 0; i < util->size; i++) {
 372                 if (util->buf[i] == '\n')
 373                         util->num_lines++;
 374         }
 375         if(util->buf[util->size - 1] != '\n')
 376                 util->num_lines++;
 377
 378         util->line_map = xmalloc(sizeof(int) * util->num_lines);
 379
 380         for (i = 0; i < util->num_lines; i++)
 381                 util->line_map[i] = -1;
 382 }
 383
 384 static void init_first_commit(struct commit* commit, const char* filename)
 385 {
 386         struct util_info* util = commit->util;
 387         int i;
 388
 389         util->pathname = filename;
 390         if (fill_util_info(commit))
 391                 die("fill_util_info failed");
 392
 393         alloc_line_map(commit);
 394
 395         util = commit->util;
 396
 397         for (i = 0; i < util->num_lines; i++)
 398                 util->line_map[i] = i;
 399 }
 400
 401
 402 static void process_commits(struct rev_info *rev, const char *path,
 403                             struct commit** initial)
 404 {
 405         int i;
 406         struct util_info* util;
 407         int lines_left;
 408         int *blame_p;
 409         int *new_lines;
 410         int new_lines_len;
 411
 412         struct commit* commit = get_revision(rev);
 413         assert(commit);
 414         init_first_commit(commit, path);
 415
 416         util = commit->util;
 417         num_blame_lines = util->num_lines;
 418         blame_lines = xmalloc(sizeof(struct commit *) * num_blame_lines);
 419         blame_contents = util->buf;
 420         blame_len = util->size;
 421
 422         for (i = 0; i < num_blame_lines; i++)
 423                 blame_lines[i] = NULL;
 424
 425         lines_left = num_blame_lines;
 426         blame_p = xmalloc(sizeof(int) * num_blame_lines);
 427         new_lines = xmalloc(sizeof(int) * num_blame_lines);
 428         do {
 429                 struct commit_list *parents;
 430                 int num_parents;
 431                 struct util_info *util;
 432
 433                 if (DEBUG)
 434                         printf("\nProcessing commit: %d %s\n", num_commits,
 435                                sha1_to_hex(commit->object.sha1));
 436
 437                 if (lines_left == 0)
 438                         return;
 439
 440                 num_commits++;
 441                 memset(blame_p, 0, sizeof(int) * num_blame_lines);
 442                 new_lines_len = 0;
 443                 num_parents = 0;
 444                 for (parents = commit->parents;
 445                      parents != NULL; parents = parents->next)
 446                         num_parents++;
 447
 448                 if(num_parents == 0)
 449                         *initial = commit;
 450
 451                 if (fill_util_info(commit))
 452                         continue;
 453
 454                 alloc_line_map(commit);
 455                 util = commit->util;
 456
 457                 for (parents = commit->parents;
 458                      parents != NULL; parents = parents->next) {
 459                         struct commit *parent = parents->item;
 460                         struct patch *patch;
 461
 462                         if (parse_commit(parent) < 0)
 463                                 die("parse_commit error");
 464
 465                         if (DEBUG)
 466                                 printf("parent: %s\n",
 467                                        sha1_to_hex(parent->object.sha1));
 468
 469                         if (fill_util_info(parent)) {
 470                                 num_parents--;
 471                                 continue;
 472                         }
 473
 474                         patch = get_patch(parent, commit);
 475                         alloc_line_map(parent);
 476                         fill_line_map(parent, commit, patch);
 477
 478                         for (i = 0; i < patch->num; i++) {
 479                             int l;
 480                             for (l = 0; l < patch->chunks[i].len2; l++) {
 481                                 int mapped_line =
 482                                     map_line(commit, patch->chunks[i].off2 + l);
 483                                 if (mapped_line != -1) {
 484                                     blame_p[mapped_line]++;
 485                                     if (blame_p[mapped_line] == num_parents)
 486                                         new_lines[new_lines_len++] = mapped_line;
 487                                 }
 488                             }
 489                         }
 490                         free_patch(patch);
 491                 }
 492
 493                 if (DEBUG)
 494                         printf("parents: %d\n", num_parents);
 495
 496                 for (i = 0; i < new_lines_len; i++) {
 497                         int mapped_line = new_lines[i];
 498                         if (blame_lines[mapped_line] == NULL) {
 499                                 blame_lines[mapped_line] = commit;
 500                                 lines_left--;
 501                                 if (DEBUG)
 502                                         printf("blame: mapped: %d i: %d\n",
 503                                                mapped_line, i);
 504                         }
 505                 }
 506         } while ((commit = get_revision(rev)) != NULL);
 507 }
 508
 509
 510 static int compare_tree_path(struct rev_info* revs,
 511                              struct commit* c1, struct commit* c2)
 512 {
 513         int ret;
 514         const char* paths[2];
 515         struct util_info* util = c2->util;
 516         paths[0] = util->pathname;
 517         paths[1] = NULL;
 518
 519         diff_tree_setup_paths(get_pathspec(revs->prefix, paths),
 520                               &revs->pruning);
 521         ret = rev_compare_tree(revs, c1->tree, c2->tree);
 522         diff_tree_release_paths(&revs->pruning);
 523         return ret;
 524 }
 525
 526
 527 static int same_tree_as_empty_path(struct rev_info *revs, struct tree* t1,
 528                                    const char* path)
 529 {
 530         int ret;
 531         const char* paths[2];
 532         paths[0] = path;
 533         paths[1] = NULL;
 534
 535         diff_tree_setup_paths(get_pathspec(revs->prefix, paths),
 536                               &revs->pruning);
 537         ret = rev_same_tree_as_empty(revs, t1);
 538         diff_tree_release_paths(&revs->pruning);
 539         return ret;
 540 }
 541
 542 static const char* find_rename(struct commit* commit, struct commit* parent)
 543 {
 544         struct util_info* cutil = commit->util;
 545         struct diff_options diff_opts;
 546         const char *paths[1];
 547         int i;
 548
 549         if (DEBUG) {
 550                 printf("find_rename commit: %s ",
 551                        sha1_to_hex(commit->object.sha1));
 552                 puts(sha1_to_hex(parent->object.sha1));
 553         }
 554
 555         diff_setup(&diff_opts);
 556         diff_opts.recursive = 1;
 557         diff_opts.detect_rename = DIFF_DETECT_RENAME;
 558         paths[0] = NULL;
 559         diff_tree_setup_paths(paths, &diff_opts);
 560         if (diff_setup_done(&diff_opts) < 0)
 561                 die("diff_setup_done failed");
 562
 563         diff_tree_sha1(commit->tree->object.sha1, parent->tree->object.sha1,
 564                        "", &diff_opts);
 565         diffcore_std(&diff_opts);
 566
 567         for (i = 0; i < diff_queued_diff.nr; i++) {
 568                 struct diff_filepair *p = diff_queued_diff.queue[i];
 569
 570                 if (p->status == 'R' && !strcmp(p->one->path, cutil->pathname)) {
 571                         if (DEBUG)
 572                                 printf("rename %s -> %s\n", p->one->path, p->two->path);
 573                         return p->two->path;
 574                 }
 575         }
 576
 577         return 0;
 578 }
 579
 580 static void simplify_commit(struct rev_info *revs, struct commit *commit)
 581 {
 582         struct commit_list **pp, *parent;
 583
 584         if (!commit->tree)
 585                 return;
 586
 587         if (!commit->parents) {
 588                 struct util_info* util = commit->util;
 589                 if (!same_tree_as_empty_path(revs, commit->tree,
 590                                              util->pathname))
 591                         commit->object.flags |= TREECHANGE;
 592                 return;
 593         }
 594
 595         pp = &commit->parents;
 596         while ((parent = *pp) != NULL) {
 597                 struct commit *p = parent->item;
 598
 599                 if (p->object.flags & UNINTERESTING) {
 600                         pp = &parent->next;
 601                         continue;
 602                 }
 603
 604                 parse_commit(p);
 605                 switch (compare_tree_path(revs, p, commit)) {
 606                 case REV_TREE_SAME:
 607                         parent->next = NULL;
 608                         commit->parents = parent;
 609                         get_util(p)->pathname = get_util(commit)->pathname;
 610                         return;
 611
 612                 case REV_TREE_NEW:
 613                 {
 614
 615                         struct util_info* util = commit->util;
 616                         if (revs->remove_empty_trees &&
 617                             same_tree_as_empty_path(revs, p->tree,
 618                                                     util->pathname)) {
 619                                 const char* new_name = find_rename(commit, p);
 620                                 if (new_name) {
 621                                         struct util_info* putil = get_util(p);
 622                                         if (!putil->pathname)
 623                                                 putil->pathname = strdup(new_name);
 624                                 } else {
 625                                         *pp = parent->next;
 626                                         continue;
 627                                 }
 628                         }
 629                 }
 630
 631                 /* fallthrough */
 632                 case REV_TREE_DIFFERENT:
 633                         pp = &parent->next;
 634                         if (!get_util(p)->pathname)
 635                                 get_util(p)->pathname =
 636                                         get_util(commit)->pathname;
 637                         continue;
 638                 }
 639                 die("bad tree compare for commit %s",
 640                     sha1_to_hex(commit->object.sha1));
 641         }
 642         commit->object.flags |= TREECHANGE;
 643 }
 644
 645
 646 struct commit_info
 647 {
 648         char* author;
 649         char* author_mail;
 650         unsigned long author_time;
 651         char* author_tz;
 652 };
 653
 654 static void get_commit_info(struct commit* commit, struct commit_info* ret)
 655 {
 656         int len;
 657         char* tmp;
 658         static char author_buf[1024];
 659
 660         tmp = strstr(commit->buffer, "\nauthor ") + 8;
 661         len = strchr(tmp, '\n') - tmp;
 662         ret->author = author_buf;
 663         memcpy(ret->author, tmp, len);
 664
 665         tmp = ret->author;
 666         tmp += len;
 667         *tmp = 0;
 668         while(*tmp != ' ')
 669                 tmp--;
 670         ret->author_tz = tmp+1;
 671
 672         *tmp = 0;
 673         while(*tmp != ' ')
 674                 tmp--;
 675         ret->author_time = strtoul(tmp, NULL, 10);
 676
 677         *tmp = 0;
 678         while(*tmp != ' ')
 679                 tmp--;
 680         ret->author_mail = tmp + 1;
 681
 682         *tmp = 0;
 683 }
 684
 685 static const char* format_time(unsigned long time, const char* tz_str,
 686                                int show_raw_time)
 687 {
 688         static char time_buf[128];
 689         time_t t = time;
 690         int minutes, tz;
 691         struct tm *tm;
 692
 693         if (show_raw_time) {
 694                 sprintf(time_buf, "%lu %s", time, tz_str);
 695                 return time_buf;
 696         }
 697
 698         tz = atoi(tz_str);
 699         minutes = tz < 0 ? -tz : tz;
 700         minutes = (minutes / 100)*60 + (minutes % 100);
 701         minutes = tz < 0 ? -minutes : minutes;
 702         t = time + minutes * 60;
 703         tm = gmtime(&t);
 704
 705         strftime(time_buf, sizeof(time_buf), "%Y-%m-%d %H:%M:%S ", tm);
 706         strcat(time_buf, tz_str);
 707         return time_buf;
 708 }
 709
 710 static void topo_setter(struct commit* c, void* data)
 711 {
 712         struct util_info* util = c->util;
 713         util->topo_data = data;
 714 }
 715
 716 static void* topo_getter(struct commit* c)
 717 {
 718         struct util_info* util = c->util;
 719         return util->topo_data;
 720 }
 721
 722 static int read_ancestry(const char *graft_file,
 723                          unsigned char **start_sha1)
 724 {
 725         FILE *fp = fopen(graft_file, "r");
 726         char buf[1024];
 727         if (!fp)
 728                 return -1;
 729         while (fgets(buf, sizeof(buf), fp)) {
 730                 /* The format is just "Commit Parent1 Parent2 ...\n" */
 731                 int len = strlen(buf);
 732                 struct commit_graft *graft = read_graft_line(buf, len);
 733                 register_commit_graft(graft, 0);
 734                 if (!*start_sha1)
 735                         *start_sha1 = graft->sha1;
 736         }
 737         fclose(fp);
 738         return 0;
 739 }
 740
 741 int main(int argc, const char **argv)
 742 {
 743         int i;
 744         struct commit *initial = NULL;
 745         unsigned char sha1[20], *sha1_p = NULL;
 746
 747         const char *filename = NULL, *commit = NULL;
 748         char filename_buf[256];
 749         int sha1_len = 8;
 750         int compatibility = 0;
 751         int show_raw_time = 0;
 752         int options = 1;
 753         struct commit* start_commit;
 754
 755         const char* args[10];
 756         struct rev_info rev;
 757
 758         struct commit_info ci;
 759         const char *buf;
 760         int max_digits;
 761         int longest_file, longest_author;
 762         int found_rename;
 763
 764         const char* prefix = setup_git_directory();
 765         git_config(git_default_config);
 766
 767         for(i = 1; i < argc; i++) {
 768                 if(options) {
 769                         if(!strcmp(argv[i], "-h") ||
 770                            !strcmp(argv[i], "--help"))
 771                                 usage(blame_usage);
 772                         else if(!strcmp(argv[i], "-l") ||
 773                                 !strcmp(argv[i], "--long")) {
 774                                 sha1_len = 40;
 775                                 continue;
 776                         } else if(!strcmp(argv[i], "-c") ||
 777                                   !strcmp(argv[i], "--compatibility")) {
 778                                 compatibility = 1;
 779                                 continue;
 780                         } else if(!strcmp(argv[i], "-t") ||
 781                                   !strcmp(argv[i], "--time")) {
 782                                 show_raw_time = 1;
 783                                 continue;
 784                         } else if(!strcmp(argv[i], "-S")) {
 785                                 if (i + 1 < argc &&
 786                                     !read_ancestry(argv[i + 1], &sha1_p)) {
 787                                         compatibility = 1;
 788                                         i++;
 789                                         continue;
 790                                 }
 791                                 usage(blame_usage);
 792                         } else if(!strcmp(argv[i], "--")) {
 793                                 options = 0;
 794                                 continue;
 795                         } else if(argv[i][0] == '-')
 796                                 usage(blame_usage);
 797                         else
 798                                 options = 0;
 799                 }
 800
 801                 if(!options) {
 802                         if(!filename)
 803                                 filename = argv[i];
 804                         else if(!commit)
 805                                 commit = argv[i];
 806                         else
 807                                 usage(blame_usage);
 808                 }
 809         }
 810
 811         if(!filename)
 812                 usage(blame_usage);
 813         if (commit && sha1_p)
 814                 usage(blame_usage);
 815         else if(!commit)
 816                 commit = "HEAD";
 817
 818         if(prefix)
 819                 sprintf(filename_buf, "%s%s", prefix, filename);
 820         else
 821                 strcpy(filename_buf, filename);
 822         filename = filename_buf;
 823
 824         if (!sha1_p) {
 825                 if (get_sha1(commit, sha1))
 826                         die("get_sha1 failed, commit '%s' not found", commit);
 827                 sha1_p = sha1;
 828         }
 829         start_commit = lookup_commit_reference(sha1_p);
 830         get_util(start_commit)->pathname = filename;
 831         if (fill_util_info(start_commit)) {
 832                 printf("%s not found in %s\n", filename, commit);
 833                 return 1;
 834         }
 835
 836
 837         init_revisions(&rev, setup_git_directory());
 838         rev.remove_empty_trees = 1;
 839         rev.topo_order = 1;
 840         rev.prune_fn = simplify_commit;
 841         rev.topo_setter = topo_setter;
 842         rev.topo_getter = topo_getter;
 843         rev.parents = 1;
 844         rev.limited = 1;
 845
 846         commit_list_insert(start_commit, &rev.commits);
 847
 848         args[0] = filename;
 849         args[1] = NULL;
 850         diff_tree_setup_paths(args, &rev.pruning);
 851         prepare_revision_walk(&rev);
 852         process_commits(&rev, filename, &initial);
 853
 854         buf = blame_contents;
 855         for (max_digits = 1, i = 10; i <= num_blame_lines + 1; max_digits++)
 856                 i *= 10;
 857
 858         longest_file = 0;
 859         longest_author = 0;
 860         found_rename = 0;
 861         for (i = 0; i < num_blame_lines; i++) {
 862                 struct commit *c = blame_lines[i];
 863                 struct util_info* u;
 864                 if (!c)
 865                         c = initial;
 866                 u = c->util;
 867
 868                 if (!found_rename && strcmp(filename, u->pathname))
 869                         found_rename = 1;
 870                 if (longest_file < strlen(u->pathname))
 871                         longest_file = strlen(u->pathname);
 872                 get_commit_info(c, &ci);
 873                 if (longest_author < strlen(ci.author))
 874                         longest_author = strlen(ci.author);
 875         }
 876
 877         for (i = 0; i < num_blame_lines; i++) {
 878                 struct commit *c = blame_lines[i];
 879                 struct util_info* u;
 880
 881                 if (!c)
 882                         c = initial;
 883
 884                 u = c->util;
 885                 get_commit_info(c, &ci);
 886                 fwrite(sha1_to_hex(c->object.sha1), sha1_len, 1, stdout);
 887                 if(compatibility) {
 888                         printf("\t(%10s\t%10s\t%d)", ci.author,
 889                                format_time(ci.author_time, ci.author_tz,
 890                                            show_raw_time),
 891                                i+1);
 892                 } else {
 893                         if (found_rename)
 894                                 printf(" %-*.*s", longest_file, longest_file,
 895                                        u->pathname);
 896                         printf(" (%-*.*s %10s %*d) ",
 897                                longest_author, longest_author, ci.author,
 898                                format_time(ci.author_time, ci.author_tz,
 899                                            show_raw_time),
 900                                max_digits, i+1);
 901                 }
 902
 903                 if(i == num_blame_lines - 1) {
 904                         fwrite(buf, blame_len - (buf - blame_contents),
 905                                1, stdout);
 906                         if(blame_contents[blame_len-1] != '\n')
 907                                 putc('\n', stdout);
 908                 } else {
 909                         char* next_buf = strchr(buf, '\n') + 1;
 910                         fwrite(buf, next_buf - buf, 1, stdout);
 911                         buf = next_buf;
 912                 }
 913         }
 914
 915         if (DEBUG) {
 916                 printf("num get patch: %d\n", num_get_patch);
 917                 printf("num commits: %d\n", num_commits);
 918                 printf("patch time: %f\n", patch_time / 1000000.0);
 919                 printf("initial: %s\n", sha1_to_hex(initial->object.sha1));
 920         }
 921
 922         return 0;
 923 }