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
  20 #define DEBUG 0
  21
  22 static const char blame_usage[] = "[-c] [-l] [--] file [commit]\n"
  23         "  -c, --compability Use the same output mode as git-annotate (Default: off)\n"
  24         "  -l, --long        Show long commit SHA1 (Default: off)\n"
  25         "  -h, --help        This message";
  26
  27 static struct commit **blame_lines;
  28 static int num_blame_lines;
  29 static char* blame_contents;
  30 static int blame_len;
  31
  32 struct util_info {
  33         int *line_map;
  34         unsigned char sha1[20]; /* blob sha, not commit! */
  35         char *buf;
  36         unsigned long size;
  37         int num_lines;
  38         const char* pathname;
  39
  40         void* topo_data;
  41 };
  42
  43 struct chunk {
  44         int off1, len1; // ---
  45         int off2, len2; // +++
  46 };
  47
  48 struct patch {
  49         struct chunk *chunks;
  50         int num;
  51 };
  52
  53 static void get_blob(struct commit *commit);
  54
  55 /* Only used for statistics */
  56 static int num_get_patch = 0;
  57 static int num_commits = 0;
  58 static int patch_time = 0;
  59
  60 #define TEMPFILE_PATH_LEN 60
  61 static struct patch *get_patch(struct commit *commit, struct commit *other)
  62 {
  63         struct patch *ret;
  64         struct util_info *info_c = (struct util_info *)commit->object.util;
  65         struct util_info *info_o = (struct util_info *)other->object.util;
  66         char tmp_path1[TEMPFILE_PATH_LEN], tmp_path2[TEMPFILE_PATH_LEN];
  67         char diff_cmd[TEMPFILE_PATH_LEN*2 + 20];
  68         struct timeval tv_start, tv_end;
  69         int fd;
  70         FILE *fin;
  71         char buf[1024];
  72
  73         ret = xmalloc(sizeof(struct patch));
  74         ret->chunks = NULL;
  75         ret->num = 0;
  76
  77         get_blob(commit);
  78         get_blob(other);
  79
  80         gettimeofday(&tv_start, NULL);
  81
  82         fd = git_mkstemp(tmp_path1, TEMPFILE_PATH_LEN, "git-blame-XXXXXX");
  83         if (fd < 0)
  84                 die("unable to create temp-file: %s", strerror(errno));
  85
  86         if (xwrite(fd, info_c->buf, info_c->size) != info_c->size)
  87                 die("write failed: %s", strerror(errno));
  88         close(fd);
  89
  90         fd = git_mkstemp(tmp_path2, TEMPFILE_PATH_LEN, "git-blame-XXXXXX");
  91         if (fd < 0)
  92                 die("unable to create temp-file: %s", strerror(errno));
  93
  94         if (xwrite(fd, info_o->buf, info_o->size) != info_o->size)
  95                 die("write failed: %s", strerror(errno));
  96         close(fd);
  97
  98         sprintf(diff_cmd, "diff -U 0 %s %s", tmp_path1, tmp_path2);
  99         fin = popen(diff_cmd, "r");
 100         if (!fin)
 101                 die("popen failed: %s", strerror(errno));
 102
 103         while (fgets(buf, sizeof(buf), fin)) {
 104                 struct chunk *chunk;
 105                 char *start, *sp;
 106
 107                 if (buf[0] != '@' || buf[1] != '@')
 108                         continue;
 109
 110                 if (DEBUG)
 111                         printf("chunk line: %s", buf);
 112                 ret->num++;
 113                 ret->chunks = xrealloc(ret->chunks,
 114                                        sizeof(struct chunk) * ret->num);
 115                 chunk = &ret->chunks[ret->num - 1];
 116
 117                 assert(!strncmp(buf, "@@ -", 4));
 118
 119                 start = buf + 4;
 120                 sp = index(start, ' ');
 121                 *sp = '\0';
 122                 if (index(start, ',')) {
 123                         int ret =
 124                             sscanf(start, "%d,%d", &chunk->off1, &chunk->len1);
 125                         assert(ret == 2);
 126                 } else {
 127                         int ret = sscanf(start, "%d", &chunk->off1);
 128                         assert(ret == 1);
 129                         chunk->len1 = 1;
 130                 }
 131                 *sp = ' ';
 132
 133                 start = sp + 1;
 134                 sp = index(start, ' ');
 135                 *sp = '\0';
 136                 if (index(start, ',')) {
 137                         int ret =
 138                             sscanf(start, "%d,%d", &chunk->off2, &chunk->len2);
 139                         assert(ret == 2);
 140                 } else {
 141                         int ret = sscanf(start, "%d", &chunk->off2);
 142                         assert(ret == 1);
 143                         chunk->len2 = 1;
 144                 }
 145                 *sp = ' ';
 146
 147                 if (chunk->len1 == 0)
 148                         chunk->off1++;
 149                 if (chunk->len2 == 0)
 150                         chunk->off2++;
 151
 152                 if (chunk->off1 > 0)
 153                         chunk->off1--;
 154                 if (chunk->off2 > 0)
 155                         chunk->off2--;
 156
 157                 assert(chunk->off1 >= 0);
 158                 assert(chunk->off2 >= 0);
 159         }
 160         pclose(fin);
 161         unlink(tmp_path1);
 162         unlink(tmp_path2);
 163
 164         gettimeofday(&tv_end, NULL);
 165         patch_time += 1000000 * (tv_end.tv_sec - tv_start.tv_sec) +
 166                 tv_end.tv_usec - tv_start.tv_usec;
 167
 168         num_get_patch++;
 169         return ret;
 170 }
 171
 172 static void free_patch(struct patch *p)
 173 {
 174         free(p->chunks);
 175         free(p);
 176 }
 177
 178 static int get_blob_sha1_internal(unsigned char *sha1, const char *base,
 179                                   int baselen, const char *pathname,
 180                                   unsigned mode, int stage);
 181
 182 static unsigned char blob_sha1[20];
 183 static const char* blame_file;
 184 static int get_blob_sha1(struct tree *t, const char *pathname,
 185                          unsigned char *sha1)
 186 {
 187         int i;
 188         const char *pathspec[2];
 189         blame_file = pathname;
 190         pathspec[0] = pathname;
 191         pathspec[1] = NULL;
 192         memset(blob_sha1, 0, sizeof(blob_sha1));
 193         read_tree_recursive(t, "", 0, 0, pathspec, get_blob_sha1_internal);
 194
 195         for (i = 0; i < 20; i++) {
 196                 if (blob_sha1[i] != 0)
 197                         break;
 198         }
 199
 200         if (i == 20)
 201                 return -1;
 202
 203         memcpy(sha1, blob_sha1, 20);
 204         return 0;
 205 }
 206
 207 static int get_blob_sha1_internal(unsigned char *sha1, const char *base,
 208                                   int baselen, const char *pathname,
 209                                   unsigned mode, int stage)
 210 {
 211         if (S_ISDIR(mode))
 212                 return READ_TREE_RECURSIVE;
 213
 214         if (strncmp(blame_file, base, baselen) ||
 215             strcmp(blame_file + baselen, pathname))
 216                 return -1;
 217
 218         memcpy(blob_sha1, sha1, 20);
 219         return -1;
 220 }
 221
 222 static void get_blob(struct commit *commit)
 223 {
 224         struct util_info *info = commit->object.util;
 225         char type[20];
 226
 227         if (info->buf)
 228                 return;
 229
 230         info->buf = read_sha1_file(info->sha1, type, &info->size);
 231
 232         assert(!strcmp(type, "blob"));
 233 }
 234
 235 /* For debugging only */
 236 static void print_patch(struct patch *p)
 237 {
 238         int i;
 239         printf("Num chunks: %d\n", p->num);
 240         for (i = 0; i < p->num; i++) {
 241                 printf("%d,%d %d,%d\n", p->chunks[i].off1, p->chunks[i].len1,
 242                        p->chunks[i].off2, p->chunks[i].len2);
 243         }
 244 }
 245
 246 #if DEBUG
 247 /* For debugging only */
 248 static void print_map(struct commit *cmit, struct commit *other)
 249 {
 250         struct util_info *util = cmit->object.util;
 251         struct util_info *util2 = other->object.util;
 252
 253         int i;
 254         int max =
 255             util->num_lines >
 256             util2->num_lines ? util->num_lines : util2->num_lines;
 257         int num;
 258
 259         for (i = 0; i < max; i++) {
 260                 printf("i: %d ", i);
 261                 num = -1;
 262
 263                 if (i < util->num_lines) {
 264                         num = util->line_map[i];
 265                         printf("%d\t", num);
 266                 } else
 267                         printf("\t");
 268
 269                 if (i < util2->num_lines) {
 270                         int num2 = util2->line_map[i];
 271                         printf("%d\t", num2);
 272                         if (num != -1 && num2 != num)
 273                                 printf("---");
 274                 } else
 275                         printf("\t");
 276
 277                 printf("\n");
 278         }
 279 }
 280 #endif
 281
 282 // p is a patch from commit to other.
 283 static void fill_line_map(struct commit *commit, struct commit *other,
 284                           struct patch *p)
 285 {
 286         struct util_info *util = commit->object.util;
 287         struct util_info *util2 = other->object.util;
 288         int *map = util->line_map;
 289         int *map2 = util2->line_map;
 290         int cur_chunk = 0;
 291         int i1, i2;
 292
 293         if (p->num && DEBUG)
 294                 print_patch(p);
 295
 296         if (DEBUG)
 297                 printf("num lines 1: %d num lines 2: %d\n", util->num_lines,
 298                        util2->num_lines);
 299
 300         for (i1 = 0, i2 = 0; i1 < util->num_lines; i1++, i2++) {
 301                 struct chunk *chunk = NULL;
 302                 if (cur_chunk < p->num)
 303                         chunk = &p->chunks[cur_chunk];
 304
 305                 if (chunk && chunk->off1 == i1) {
 306                         if (DEBUG && i2 != chunk->off2)
 307                                 printf("i2: %d off2: %d\n", i2, chunk->off2);
 308
 309                         assert(i2 == chunk->off2);
 310
 311                         i1--;
 312                         i2--;
 313                         if (chunk->len1 > 0)
 314                                 i1 += chunk->len1;
 315
 316                         if (chunk->len2 > 0)
 317                                 i2 += chunk->len2;
 318
 319                         cur_chunk++;
 320                 } else {
 321                         if (i2 >= util2->num_lines)
 322                                 break;
 323
 324                         if (map[i1] != map2[i2] && map[i1] != -1) {
 325                                 if (DEBUG)
 326                                         printf("map: i1: %d %d %p i2: %d %d %p\n",
 327                                                i1, map[i1],
 328                                                i1 != -1 ? blame_lines[map[i1]] : NULL,
 329                                                i2, map2[i2],
 330                                                i2 != -1 ? blame_lines[map2[i2]] : NULL);
 331                                 if (map2[i2] != -1 &&
 332                                     blame_lines[map[i1]] &&
 333                                     !blame_lines[map2[i2]])
 334                                         map[i1] = map2[i2];
 335                         }
 336
 337                         if (map[i1] == -1 && map2[i2] != -1)
 338                                 map[i1] = map2[i2];
 339                 }
 340
 341                 if (DEBUG > 1)
 342                         printf("l1: %d l2: %d i1: %d i2: %d\n",
 343                                map[i1], map2[i2], i1, i2);
 344         }
 345 }
 346
 347 static int map_line(struct commit *commit, int line)
 348 {
 349         struct util_info *info = commit->object.util;
 350         assert(line >= 0 && line < info->num_lines);
 351         return info->line_map[line];
 352 }
 353
 354 static struct util_info* get_util(struct commit *commit)
 355 {
 356         struct util_info *util = commit->object.util;
 357
 358         if (util)
 359                 return util;
 360
 361         util = xmalloc(sizeof(struct util_info));
 362         util->buf = NULL;
 363         util->size = 0;
 364         util->line_map = NULL;
 365         util->num_lines = -1;
 366         util->pathname = NULL;
 367         commit->object.util = util;
 368         return util;
 369 }
 370
 371 static int fill_util_info(struct commit *commit)
 372 {
 373         struct util_info *util = commit->object.util;
 374
 375         assert(util);
 376         assert(util->pathname);
 377
 378         if (get_blob_sha1(commit->tree, util->pathname, util->sha1))
 379                 return 1;
 380         else
 381                 return 0;
 382 }
 383
 384 static void alloc_line_map(struct commit *commit)
 385 {
 386         struct util_info *util = commit->object.util;
 387         int i;
 388
 389         if (util->line_map)
 390                 return;
 391
 392         get_blob(commit);
 393
 394         util->num_lines = 0;
 395         for (i = 0; i < util->size; i++) {
 396                 if (util->buf[i] == '\n')
 397                         util->num_lines++;
 398         }
 399         if(util->buf[util->size - 1] != '\n')
 400                 util->num_lines++;
 401
 402         util->line_map = xmalloc(sizeof(int) * util->num_lines);
 403
 404         for (i = 0; i < util->num_lines; i++)
 405                 util->line_map[i] = -1;
 406 }
 407
 408 static void init_first_commit(struct commit* commit, const char* filename)
 409 {
 410         struct util_info* util = commit->object.util;
 411         int i;
 412
 413         util->pathname = filename;
 414         if (fill_util_info(commit))
 415                 die("fill_util_info failed");
 416
 417         alloc_line_map(commit);
 418
 419         util = commit->object.util;
 420
 421         for (i = 0; i < util->num_lines; i++)
 422                 util->line_map[i] = i;
 423 }
 424
 425
 426 static void process_commits(struct rev_info *rev, const char *path,
 427                             struct commit** initial)
 428 {
 429         int i;
 430         struct util_info* util;
 431         int lines_left;
 432         int *blame_p;
 433         int *new_lines;
 434         int new_lines_len;
 435
 436         struct commit* commit = get_revision(rev);
 437         assert(commit);
 438         init_first_commit(commit, path);
 439
 440         util = commit->object.util;
 441         num_blame_lines = util->num_lines;
 442         blame_lines = xmalloc(sizeof(struct commit *) * num_blame_lines);
 443         blame_contents = util->buf;
 444         blame_len = util->size;
 445
 446         for (i = 0; i < num_blame_lines; i++)
 447                 blame_lines[i] = NULL;
 448
 449         lines_left = num_blame_lines;
 450         blame_p = xmalloc(sizeof(int) * num_blame_lines);
 451         new_lines = xmalloc(sizeof(int) * num_blame_lines);
 452         do {
 453                 struct commit_list *parents;
 454                 int num_parents;
 455                 struct util_info *util;
 456
 457                 if (DEBUG)
 458                         printf("\nProcessing commit: %d %s\n", num_commits,
 459                                sha1_to_hex(commit->object.sha1));
 460
 461                 if (lines_left == 0)
 462                         return;
 463
 464                 num_commits++;
 465                 memset(blame_p, 0, sizeof(int) * num_blame_lines);
 466                 new_lines_len = 0;
 467                 num_parents = 0;
 468                 for (parents = commit->parents;
 469                      parents != NULL; parents = parents->next)
 470                         num_parents++;
 471
 472                 if(num_parents == 0)
 473                         *initial = commit;
 474
 475                 if (fill_util_info(commit))
 476                         continue;
 477
 478                 alloc_line_map(commit);
 479                 util = commit->object.util;
 480
 481                 for (parents = commit->parents;
 482                      parents != NULL; parents = parents->next) {
 483                         struct commit *parent = parents->item;
 484                         struct patch *patch;
 485
 486                         if (parse_commit(parent) < 0)
 487                                 die("parse_commit error");
 488
 489                         if (DEBUG)
 490                                 printf("parent: %s\n",
 491                                        sha1_to_hex(parent->object.sha1));
 492
 493                         if (fill_util_info(parent)) {
 494                                 num_parents--;
 495                                 continue;
 496                         }
 497
 498                         patch = get_patch(parent, commit);
 499                         alloc_line_map(parent);
 500                         fill_line_map(parent, commit, patch);
 501
 502                         for (i = 0; i < patch->num; i++) {
 503                             int l;
 504                             for (l = 0; l < patch->chunks[i].len2; l++) {
 505                                 int mapped_line =
 506                                     map_line(commit, patch->chunks[i].off2 + l);
 507                                 if (mapped_line != -1) {
 508                                     blame_p[mapped_line]++;
 509                                     if (blame_p[mapped_line] == num_parents)
 510                                         new_lines[new_lines_len++] = mapped_line;
 511                                 }
 512                             }
 513                         }
 514                         free_patch(patch);
 515                 }
 516
 517                 if (DEBUG)
 518                         printf("parents: %d\n", num_parents);
 519
 520                 for (i = 0; i < new_lines_len; i++) {
 521                         int mapped_line = new_lines[i];
 522                         if (blame_lines[mapped_line] == NULL) {
 523                                 blame_lines[mapped_line] = commit;
 524                                 lines_left--;
 525                                 if (DEBUG)
 526                                         printf("blame: mapped: %d i: %d\n",
 527                                                mapped_line, i);
 528                         }
 529                 }
 530         } while ((commit = get_revision(rev)) != NULL);
 531 }
 532
 533
 534 static int compare_tree_path(struct rev_info* revs,
 535                              struct commit* c1, struct commit* c2)
 536 {
 537         const char* paths[2];
 538         struct util_info* util = c2->object.util;
 539         paths[0] = util->pathname;
 540         paths[1] = NULL;
 541
 542         diff_tree_setup_paths(get_pathspec(revs->prefix, paths));
 543         return rev_compare_tree(c1->tree, c2->tree);
 544 }
 545
 546
 547 static int same_tree_as_empty_path(struct rev_info *revs, struct tree* t1,
 548                                    const char* path)
 549 {
 550         const char* paths[2];
 551         paths[0] = path;
 552         paths[1] = NULL;
 553
 554         diff_tree_setup_paths(get_pathspec(revs->prefix, paths));
 555         return rev_same_tree_as_empty(t1);
 556 }
 557
 558 static const char* find_rename(struct commit* commit, struct commit* parent)
 559 {
 560         struct util_info* cutil = commit->object.util;
 561         struct diff_options diff_opts;
 562         const char *paths[1];
 563         int i;
 564
 565         if (DEBUG) {
 566                 printf("find_rename commit: %s ",
 567                        sha1_to_hex(commit->object.sha1));
 568                 puts(sha1_to_hex(parent->object.sha1));
 569         }
 570
 571         diff_setup(&diff_opts);
 572         diff_opts.recursive = 1;
 573         diff_opts.detect_rename = DIFF_DETECT_RENAME;
 574         paths[0] = NULL;
 575         diff_tree_setup_paths(paths);
 576         if (diff_setup_done(&diff_opts) < 0)
 577                 die("diff_setup_done failed");
 578
 579         diff_tree_sha1(commit->tree->object.sha1, parent->tree->object.sha1,
 580                        "", &diff_opts);
 581         diffcore_std(&diff_opts);
 582
 583         for (i = 0; i < diff_queued_diff.nr; i++) {
 584                 struct diff_filepair *p = diff_queued_diff.queue[i];
 585
 586                 if (p->status == 'R' && !strcmp(p->one->path, cutil->pathname)) {
 587                         if (DEBUG)
 588                                 printf("rename %s -> %s\n", p->one->path, p->two->path);
 589                         return p->two->path;
 590                 }
 591         }
 592
 593         return 0;
 594 }
 595
 596 static void simplify_commit(struct rev_info *revs, struct commit *commit)
 597 {
 598         struct commit_list **pp, *parent;
 599
 600         if (!commit->tree)
 601                 return;
 602
 603         if (!commit->parents) {
 604                 struct util_info* util = commit->object.util;
 605                 if (!same_tree_as_empty_path(revs, commit->tree,
 606                                              util->pathname))
 607                         commit->object.flags |= TREECHANGE;
 608                 return;
 609         }
 610
 611         pp = &commit->parents;
 612         while ((parent = *pp) != NULL) {
 613                 struct commit *p = parent->item;
 614
 615                 if (p->object.flags & UNINTERESTING) {
 616                         pp = &parent->next;
 617                         continue;
 618                 }
 619
 620                 parse_commit(p);
 621                 switch (compare_tree_path(revs, p, commit)) {
 622                 case REV_TREE_SAME:
 623                         parent->next = NULL;
 624                         commit->parents = parent;
 625                         get_util(p)->pathname = get_util(commit)->pathname;
 626                         return;
 627
 628                 case REV_TREE_NEW:
 629                 {
 630
 631                         struct util_info* util = commit->object.util;
 632                         if (revs->remove_empty_trees &&
 633                             same_tree_as_empty_path(revs, p->tree,
 634                                                     util->pathname)) {
 635                                 const char* new_name = find_rename(commit, p);
 636                                 if (new_name) {
 637                                         struct util_info* putil = get_util(p);
 638                                         if (!putil->pathname)
 639                                                 putil->pathname = strdup(new_name);
 640                                 } else {
 641                                         *pp = parent->next;
 642                                         continue;
 643                                 }
 644                         }
 645                 }
 646
 647                 /* fallthrough */
 648                 case REV_TREE_DIFFERENT:
 649                         pp = &parent->next;
 650                         if (!get_util(p)->pathname)
 651                                 get_util(p)->pathname =
 652                                         get_util(commit)->pathname;
 653                         continue;
 654                 }
 655                 die("bad tree compare for commit %s",
 656                     sha1_to_hex(commit->object.sha1));
 657         }
 658         commit->object.flags |= TREECHANGE;
 659 }
 660
 661
 662 struct commit_info
 663 {
 664         char* author;
 665         char* author_mail;
 666         unsigned long author_time;
 667         char* author_tz;
 668 };
 669
 670 static void get_commit_info(struct commit* commit, struct commit_info* ret)
 671 {
 672         int len;
 673         char* tmp;
 674         static char author_buf[1024];
 675
 676         tmp = strstr(commit->buffer, "\nauthor ") + 8;
 677         len = index(tmp, '\n') - tmp;
 678         ret->author = author_buf;
 679         memcpy(ret->author, tmp, len);
 680
 681         tmp = ret->author;
 682         tmp += len;
 683         *tmp = 0;
 684         while(*tmp != ' ')
 685                 tmp--;
 686         ret->author_tz = tmp+1;
 687
 688         *tmp = 0;
 689         while(*tmp != ' ')
 690                 tmp--;
 691         ret->author_time = strtoul(tmp, NULL, 10);
 692
 693         *tmp = 0;
 694         while(*tmp != ' ')
 695                 tmp--;
 696         ret->author_mail = tmp + 1;
 697
 698         *tmp = 0;
 699 }
 700
 701 static const char* format_time(unsigned long time, const char* tz_str)
 702 {
 703         static char time_buf[128];
 704         time_t t = time;
 705         int minutes, tz;
 706         struct tm *tm;
 707
 708         tz = atoi(tz_str);
 709         minutes = tz < 0 ? -tz : tz;
 710         minutes = (minutes / 100)*60 + (minutes % 100);
 711         minutes = tz < 0 ? -minutes : minutes;
 712         t = time + minutes * 60;
 713         tm = gmtime(&t);
 714
 715         strftime(time_buf, sizeof(time_buf), "%Y-%m-%d %H:%M:%S ", tm);
 716         strcat(time_buf, tz_str);
 717         return time_buf;
 718 }
 719
 720 static void topo_setter(struct commit* c, void* data)
 721 {
 722         struct util_info* util = c->object.util;
 723         util->topo_data = data;
 724 }
 725
 726 static void* topo_getter(struct commit* c)
 727 {
 728         struct util_info* util = c->object.util;
 729         return util->topo_data;
 730 }
 731
 732 int main(int argc, const char **argv)
 733 {
 734         int i;
 735         struct commit *initial = NULL;
 736         unsigned char sha1[20];
 737
 738         const char *filename = NULL, *commit = NULL;
 739         char filename_buf[256];
 740         int sha1_len = 8;
 741         int compability = 0;
 742         int options = 1;
 743         struct commit* start_commit;
 744
 745         const char* args[10];
 746         struct rev_info rev;
 747
 748         struct commit_info ci;
 749         const char *buf;
 750         int max_digits;
 751         int longest_file, longest_author;
 752         int found_rename;
 753
 754         const char* prefix = setup_git_directory();
 755
 756         for(i = 1; i < argc; i++) {
 757                 if(options) {
 758                         if(!strcmp(argv[i], "-h") ||
 759                            !strcmp(argv[i], "--help"))
 760                                 usage(blame_usage);
 761                         else if(!strcmp(argv[i], "-l") ||
 762                                 !strcmp(argv[i], "--long")) {
 763                                 sha1_len = 40;
 764                                 continue;
 765                         } else if(!strcmp(argv[i], "-c") ||
 766                                   !strcmp(argv[i], "--compability")) {
 767                                 compability = 1;
 768                                 continue;
 769                         } else if(!strcmp(argv[i], "--")) {
 770                                 options = 0;
 771                                 continue;
 772                         } else if(argv[i][0] == '-')
 773                                 usage(blame_usage);
 774                         else
 775                                 options = 0;
 776                 }
 777
 778                 if(!options) {
 779                         if(!filename)
 780                                 filename = argv[i];
 781                         else if(!commit)
 782                                 commit = argv[i];
 783                         else
 784                                 usage(blame_usage);
 785                 }
 786         }
 787
 788         if(!filename)
 789                 usage(blame_usage);
 790         if(!commit)
 791                 commit = "HEAD";
 792
 793         if(prefix)
 794                 sprintf(filename_buf, "%s%s", prefix, filename);
 795         else
 796                 strcpy(filename_buf, filename);
 797         filename = filename_buf;
 798
 799         if (get_sha1(commit, sha1))
 800                 die("get_sha1 failed, commit '%s' not found", commit);
 801         start_commit = lookup_commit_reference(sha1);
 802         get_util(start_commit)->pathname = filename;
 803         if (fill_util_info(start_commit)) {
 804                 printf("%s not found in %s\n", filename, commit);
 805                 return 1;
 806         }
 807
 808
 809         init_revisions(&rev);
 810         rev.remove_empty_trees = 1;
 811         rev.topo_order = 1;
 812         rev.prune_fn = simplify_commit;
 813         rev.topo_setter = topo_setter;
 814         rev.topo_getter = topo_getter;
 815         rev.limited = 1;
 816
 817         commit_list_insert(start_commit, &rev.commits);
 818
 819         args[0] = filename;
 820         args[1] = NULL;
 821         diff_tree_setup_paths(args);
 822         prepare_revision_walk(&rev);
 823         process_commits(&rev, filename, &initial);
 824
 825         buf = blame_contents;
 826         for (max_digits = 1, i = 10; i <= num_blame_lines + 1; max_digits++)
 827                 i *= 10;
 828
 829         longest_file = 0;
 830         longest_author = 0;
 831         found_rename = 0;
 832         for (i = 0; i < num_blame_lines; i++) {
 833                 struct commit *c = blame_lines[i];
 834                 struct util_info* u;
 835                 if (!c)
 836                         c = initial;
 837                 u = c->object.util;
 838
 839                 if (!found_rename && strcmp(filename, u->pathname))
 840                         found_rename = 1;
 841                 if (longest_file < strlen(u->pathname))
 842                         longest_file = strlen(u->pathname);
 843                 get_commit_info(c, &ci);
 844                 if (longest_author < strlen(ci.author))
 845                         longest_author = strlen(ci.author);
 846         }
 847
 848         for (i = 0; i < num_blame_lines; i++) {
 849                 struct commit *c = blame_lines[i];
 850                 struct util_info* u;
 851
 852                 if (!c)
 853                         c = initial;
 854
 855                 u = c->object.util;
 856                 get_commit_info(c, &ci);
 857                 fwrite(sha1_to_hex(c->object.sha1), sha1_len, 1, stdout);
 858                 if(compability) {
 859                         printf("\t(%10s\t%10s\t%d)", ci.author,
 860                                format_time(ci.author_time, ci.author_tz), i+1);
 861                 } else {
 862                         if (found_rename)
 863                                 printf(" %-*.*s", longest_file, longest_file,
 864                                        u->pathname);
 865                         printf(" (%-*.*s %10s %*d) ",
 866                                longest_author, longest_author, ci.author,
 867                                format_time(ci.author_time, ci.author_tz),
 868                                max_digits, i+1);
 869                 }
 870
 871                 if(i == num_blame_lines - 1) {
 872                         fwrite(buf, blame_len - (buf - blame_contents),
 873                                1, stdout);
 874                         if(blame_contents[blame_len-1] != '\n')
 875                                 putc('\n', stdout);
 876                 } else {
 877                         char* next_buf = index(buf, '\n') + 1;
 878                         fwrite(buf, next_buf - buf, 1, stdout);
 879                         buf = next_buf;
 880                 }
 881         }
 882
 883         if (DEBUG) {
 884                 printf("num get patch: %d\n", num_get_patch);
 885                 printf("num commits: %d\n", num_commits);
 886                 printf("patch time: %f\n", patch_time / 1000000.0);
 887                 printf("initial: %s\n", sha1_to_hex(initial->object.sha1));
 888         }
 889
 890         return 0;
 891 }