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