Andrew's git / gitweb.git / blame.c
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blame.con commit use do() instead of require() to include configuration (4b5dc98)
   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
  23static 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
  30static struct commit **blame_lines;
  31static int num_blame_lines;
  32static char* blame_contents;
  33static int blame_len;
  34
  35struct 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
  46struct chunk {
  47        int off1, len1; /* --- */
  48        int off2, len2; /* +++ */
  49};
  50
  51struct patch {
  52        struct chunk *chunks;
  53        int num;
  54};
  55
  56static void get_blob(struct commit *commit);
  57
  58/* Only used for statistics */
  59static int num_get_patch;
  60static int num_commits;
  61static int patch_time;
  62
  63struct blame_diff_state {
  64        struct xdiff_emit_state xm;
  65        struct patch *ret;
  66};
  67
  68static 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
 106static 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
 148static void free_patch(struct patch *p)
 149{
 150        free(p->chunks);
 151        free(p);
 152}
 153
 154static int get_blob_sha1_internal(const unsigned char *sha1, const char *base,
 155                                  int baselen, const char *pathname,
 156                                  unsigned mode, int stage);
 157
 158static unsigned char blob_sha1[20];
 159static const char* blame_file;
 160static 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        hashclr(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        hashcpy(sha1, blob_sha1);
 180        return 0;
 181}
 182
 183static 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        hashcpy(blob_sha1, sha1);
 195        return -1;
 196}
 197
 198static 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 */
 212static 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 */
 224static 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. */
 259static 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
 323static 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
 330static 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
 347static 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        return !!get_blob_sha1(commit->tree, util->pathname, util->sha1);
 355}
 356
 357static void alloc_line_map(struct commit *commit)
 358{
 359        struct util_info *util = commit->util;
 360        int i;
 361
 362        if (util->line_map)
 363                return;
 364
 365        get_blob(commit);
 366
 367        util->num_lines = 0;
 368        for (i = 0; i < util->size; i++) {
 369                if (util->buf[i] == '\n')
 370                        util->num_lines++;
 371        }
 372        if(util->buf[util->size - 1] != '\n')
 373                util->num_lines++;
 374
 375        util->line_map = xmalloc(sizeof(int) * util->num_lines);
 376
 377        for (i = 0; i < util->num_lines; i++)
 378                util->line_map[i] = -1;
 379}
 380
 381static void init_first_commit(struct commit* commit, const char* filename)
 382{
 383        struct util_info* util = commit->util;
 384        int i;
 385
 386        util->pathname = filename;
 387        if (fill_util_info(commit))
 388                die("fill_util_info failed");
 389
 390        alloc_line_map(commit);
 391
 392        util = commit->util;
 393
 394        for (i = 0; i < util->num_lines; i++)
 395                util->line_map[i] = i;
 396}
 397
 398
 399static void process_commits(struct rev_info *rev, const char *path,
 400                            struct commit** initial)
 401{
 402        int i;
 403        struct util_info* util;
 404        int lines_left;
 405        int *blame_p;
 406        int *new_lines;
 407        int new_lines_len;
 408
 409        struct commit* commit = get_revision(rev);
 410        assert(commit);
 411        init_first_commit(commit, path);
 412
 413        util = commit->util;
 414        num_blame_lines = util->num_lines;
 415        blame_lines = xmalloc(sizeof(struct commit *) * num_blame_lines);
 416        blame_contents = util->buf;
 417        blame_len = util->size;
 418
 419        for (i = 0; i < num_blame_lines; i++)
 420                blame_lines[i] = NULL;
 421
 422        lines_left = num_blame_lines;
 423        blame_p = xmalloc(sizeof(int) * num_blame_lines);
 424        new_lines = xmalloc(sizeof(int) * num_blame_lines);
 425        do {
 426                struct commit_list *parents;
 427                int num_parents;
 428                struct util_info *util;
 429
 430                if (DEBUG)
 431                        printf("\nProcessing commit: %d %s\n", num_commits,
 432                               sha1_to_hex(commit->object.sha1));
 433
 434                if (lines_left == 0)
 435                        return;
 436
 437                num_commits++;
 438                memset(blame_p, 0, sizeof(int) * num_blame_lines);
 439                new_lines_len = 0;
 440                num_parents = 0;
 441                for (parents = commit->parents;
 442                     parents != NULL; parents = parents->next)
 443                        num_parents++;
 444
 445                if(num_parents == 0)
 446                        *initial = commit;
 447
 448                if (fill_util_info(commit))
 449                        continue;
 450
 451                alloc_line_map(commit);
 452                util = commit->util;
 453
 454                for (parents = commit->parents;
 455                     parents != NULL; parents = parents->next) {
 456                        struct commit *parent = parents->item;
 457                        struct patch *patch;
 458
 459                        if (parse_commit(parent) < 0)
 460                                die("parse_commit error");
 461
 462                        if (DEBUG)
 463                                printf("parent: %s\n",
 464                                       sha1_to_hex(parent->object.sha1));
 465
 466                        if (fill_util_info(parent)) {
 467                                num_parents--;
 468                                continue;
 469                        }
 470
 471                        patch = get_patch(parent, commit);
 472                        alloc_line_map(parent);
 473                        fill_line_map(parent, commit, patch);
 474
 475                        for (i = 0; i < patch->num; i++) {
 476                            int l;
 477                            for (l = 0; l < patch->chunks[i].len2; l++) {
 478                                int mapped_line =
 479                                    map_line(commit, patch->chunks[i].off2 + l);
 480                                if (mapped_line != -1) {
 481                                    blame_p[mapped_line]++;
 482                                    if (blame_p[mapped_line] == num_parents)
 483                                        new_lines[new_lines_len++] = mapped_line;
 484                                }
 485                            }
 486                        }
 487                        free_patch(patch);
 488                }
 489
 490                if (DEBUG)
 491                        printf("parents: %d\n", num_parents);
 492
 493                for (i = 0; i < new_lines_len; i++) {
 494                        int mapped_line = new_lines[i];
 495                        if (blame_lines[mapped_line] == NULL) {
 496                                blame_lines[mapped_line] = commit;
 497                                lines_left--;
 498                                if (DEBUG)
 499                                        printf("blame: mapped: %d i: %d\n",
 500                                               mapped_line, i);
 501                        }
 502                }
 503        } while ((commit = get_revision(rev)) != NULL);
 504}
 505
 506
 507static int compare_tree_path(struct rev_info* revs,
 508                             struct commit* c1, struct commit* c2)
 509{
 510        int ret;
 511        const char* paths[2];
 512        struct util_info* util = c2->util;
 513        paths[0] = util->pathname;
 514        paths[1] = NULL;
 515
 516        diff_tree_setup_paths(get_pathspec(revs->prefix, paths),
 517                              &revs->pruning);
 518        ret = rev_compare_tree(revs, c1->tree, c2->tree);
 519        diff_tree_release_paths(&revs->pruning);
 520        return ret;
 521}
 522
 523
 524static int same_tree_as_empty_path(struct rev_info *revs, struct tree* t1,
 525                                   const char* path)
 526{
 527        int ret;
 528        const char* paths[2];
 529        paths[0] = path;
 530        paths[1] = NULL;
 531
 532        diff_tree_setup_paths(get_pathspec(revs->prefix, paths),
 533                              &revs->pruning);
 534        ret = rev_same_tree_as_empty(revs, t1);
 535        diff_tree_release_paths(&revs->pruning);
 536        return ret;
 537}
 538
 539static const char* find_rename(struct commit* commit, struct commit* parent)
 540{
 541        struct util_info* cutil = commit->util;
 542        struct diff_options diff_opts;
 543        const char *paths[1];
 544        int i;
 545
 546        if (DEBUG) {
 547                printf("find_rename commit: %s ",
 548                       sha1_to_hex(commit->object.sha1));
 549                puts(sha1_to_hex(parent->object.sha1));
 550        }
 551
 552        diff_setup(&diff_opts);
 553        diff_opts.recursive = 1;
 554        diff_opts.detect_rename = DIFF_DETECT_RENAME;
 555        paths[0] = NULL;
 556        diff_tree_setup_paths(paths, &diff_opts);
 557        if (diff_setup_done(&diff_opts) < 0)
 558                die("diff_setup_done failed");
 559
 560        diff_tree_sha1(commit->tree->object.sha1, parent->tree->object.sha1,
 561                       "", &diff_opts);
 562        diffcore_std(&diff_opts);
 563
 564        for (i = 0; i < diff_queued_diff.nr; i++) {
 565                struct diff_filepair *p = diff_queued_diff.queue[i];
 566
 567                if (p->status == 'R' && !strcmp(p->one->path, cutil->pathname)) {
 568                        if (DEBUG)
 569                                printf("rename %s -> %s\n", p->one->path, p->two->path);
 570                        return p->two->path;
 571                }
 572        }
 573
 574        return 0;
 575}
 576
 577static void simplify_commit(struct rev_info *revs, struct commit *commit)
 578{
 579        struct commit_list **pp, *parent;
 580
 581        if (!commit->tree)
 582                return;
 583
 584        if (!commit->parents) {
 585                struct util_info* util = commit->util;
 586                if (!same_tree_as_empty_path(revs, commit->tree,
 587                                             util->pathname))
 588                        commit->object.flags |= TREECHANGE;
 589                return;
 590        }
 591
 592        pp = &commit->parents;
 593        while ((parent = *pp) != NULL) {
 594                struct commit *p = parent->item;
 595
 596                if (p->object.flags & UNINTERESTING) {
 597                        pp = &parent->next;
 598                        continue;
 599                }
 600
 601                parse_commit(p);
 602                switch (compare_tree_path(revs, p, commit)) {
 603                case REV_TREE_SAME:
 604                        parent->next = NULL;
 605                        commit->parents = parent;
 606                        get_util(p)->pathname = get_util(commit)->pathname;
 607                        return;
 608
 609                case REV_TREE_NEW:
 610                {
 611
 612                        struct util_info* util = commit->util;
 613                        if (revs->remove_empty_trees &&
 614                            same_tree_as_empty_path(revs, p->tree,
 615                                                    util->pathname)) {
 616                                const char* new_name = find_rename(commit, p);
 617                                if (new_name) {
 618                                        struct util_info* putil = get_util(p);
 619                                        if (!putil->pathname)
 620                                                putil->pathname = strdup(new_name);
 621                                } else {
 622                                        *pp = parent->next;
 623                                        continue;
 624                                }
 625                        }
 626                }
 627
 628                /* fallthrough */
 629                case REV_TREE_DIFFERENT:
 630                        pp = &parent->next;
 631                        if (!get_util(p)->pathname)
 632                                get_util(p)->pathname =
 633                                        get_util(commit)->pathname;
 634                        continue;
 635                }
 636                die("bad tree compare for commit %s",
 637                    sha1_to_hex(commit->object.sha1));
 638        }
 639        commit->object.flags |= TREECHANGE;
 640}
 641
 642
 643struct commit_info
 644{
 645        char* author;
 646        char* author_mail;
 647        unsigned long author_time;
 648        char* author_tz;
 649};
 650
 651static void get_commit_info(struct commit* commit, struct commit_info* ret)
 652{
 653        int len;
 654        char* tmp;
 655        static char author_buf[1024];
 656
 657        tmp = strstr(commit->buffer, "\nauthor ") + 8;
 658        len = strchr(tmp, '\n') - tmp;
 659        ret->author = author_buf;
 660        memcpy(ret->author, tmp, len);
 661
 662        tmp = ret->author;
 663        tmp += len;
 664        *tmp = 0;
 665        while(*tmp != ' ')
 666                tmp--;
 667        ret->author_tz = tmp+1;
 668
 669        *tmp = 0;
 670        while(*tmp != ' ')
 671                tmp--;
 672        ret->author_time = strtoul(tmp, NULL, 10);
 673
 674        *tmp = 0;
 675        while(*tmp != ' ')
 676                tmp--;
 677        ret->author_mail = tmp + 1;
 678
 679        *tmp = 0;
 680}
 681
 682static const char* format_time(unsigned long time, const char* tz_str,
 683                               int show_raw_time)
 684{
 685        static char time_buf[128];
 686        time_t t = time;
 687        int minutes, tz;
 688        struct tm *tm;
 689
 690        if (show_raw_time) {
 691                sprintf(time_buf, "%lu %s", time, tz_str);
 692                return time_buf;
 693        }
 694
 695        tz = atoi(tz_str);
 696        minutes = tz < 0 ? -tz : tz;
 697        minutes = (minutes / 100)*60 + (minutes % 100);
 698        minutes = tz < 0 ? -minutes : minutes;
 699        t = time + minutes * 60;
 700        tm = gmtime(&t);
 701
 702        strftime(time_buf, sizeof(time_buf), "%Y-%m-%d %H:%M:%S ", tm);
 703        strcat(time_buf, tz_str);
 704        return time_buf;
 705}
 706
 707static void topo_setter(struct commit* c, void* data)
 708{
 709        struct util_info* util = c->util;
 710        util->topo_data = data;
 711}
 712
 713static void* topo_getter(struct commit* c)
 714{
 715        struct util_info* util = c->util;
 716        return util->topo_data;
 717}
 718
 719static int read_ancestry(const char *graft_file,
 720                         unsigned char **start_sha1)
 721{
 722        FILE *fp = fopen(graft_file, "r");
 723        char buf[1024];
 724        if (!fp)
 725                return -1;
 726        while (fgets(buf, sizeof(buf), fp)) {
 727                /* The format is just "Commit Parent1 Parent2 ...\n" */
 728                int len = strlen(buf);
 729                struct commit_graft *graft = read_graft_line(buf, len);
 730                register_commit_graft(graft, 0);
 731                if (!*start_sha1)
 732                        *start_sha1 = graft->sha1;
 733        }
 734        fclose(fp);
 735        return 0;
 736}
 737
 738int main(int argc, const char **argv)
 739{
 740        int i;
 741        struct commit *initial = NULL;
 742        unsigned char sha1[20], *sha1_p = NULL;
 743
 744        const char *filename = NULL, *commit = NULL;
 745        char filename_buf[256];
 746        int sha1_len = 8;
 747        int compatibility = 0;
 748        int show_raw_time = 0;
 749        int options = 1;
 750        struct commit* start_commit;
 751
 752        const char* args[10];
 753        struct rev_info rev;
 754
 755        struct commit_info ci;
 756        const char *buf;
 757        int max_digits;
 758        int longest_file, longest_author;
 759        int found_rename;
 760
 761        const char* prefix = setup_git_directory();
 762        git_config(git_default_config);
 763
 764        for(i = 1; i < argc; i++) {
 765                if(options) {
 766                        if(!strcmp(argv[i], "-h") ||
 767                           !strcmp(argv[i], "--help"))
 768                                usage(blame_usage);
 769                        else if(!strcmp(argv[i], "-l") ||
 770                                !strcmp(argv[i], "--long")) {
 771                                sha1_len = 40;
 772                                continue;
 773                        } else if(!strcmp(argv[i], "-c") ||
 774                                  !strcmp(argv[i], "--compatibility")) {
 775                                compatibility = 1;
 776                                continue;
 777                        } else if(!strcmp(argv[i], "-t") ||
 778                                  !strcmp(argv[i], "--time")) {
 779                                show_raw_time = 1;
 780                                continue;
 781                        } else if(!strcmp(argv[i], "-S")) {
 782                                if (i + 1 < argc &&
 783                                    !read_ancestry(argv[i + 1], &sha1_p)) {
 784                                        compatibility = 1;
 785                                        i++;
 786                                        continue;
 787                                }
 788                                usage(blame_usage);
 789                        } else if(!strcmp(argv[i], "--")) {
 790                                options = 0;
 791                                continue;
 792                        } else if(argv[i][0] == '-')
 793                                usage(blame_usage);
 794                        else
 795                                options = 0;
 796                }
 797
 798                if(!options) {
 799                        if(!filename)
 800                                filename = argv[i];
 801                        else if(!commit)
 802                                commit = argv[i];
 803                        else
 804                                usage(blame_usage);
 805                }
 806        }
 807
 808        if(!filename)
 809                usage(blame_usage);
 810        if (commit && sha1_p)
 811                usage(blame_usage);
 812        else if(!commit)
 813                commit = "HEAD";
 814
 815        if(prefix)
 816                sprintf(filename_buf, "%s%s", prefix, filename);
 817        else
 818                strcpy(filename_buf, filename);
 819        filename = filename_buf;
 820
 821        if (!sha1_p) {
 822                if (get_sha1(commit, sha1))
 823                        die("get_sha1 failed, commit '%s' not found", commit);
 824                sha1_p = sha1;
 825        }
 826        start_commit = lookup_commit_reference(sha1_p);
 827        get_util(start_commit)->pathname = filename;
 828        if (fill_util_info(start_commit)) {
 829                printf("%s not found in %s\n", filename, commit);
 830                return 1;
 831        }
 832
 833
 834        init_revisions(&rev, setup_git_directory());
 835        rev.remove_empty_trees = 1;
 836        rev.topo_order = 1;
 837        rev.prune_fn = simplify_commit;
 838        rev.topo_setter = topo_setter;
 839        rev.topo_getter = topo_getter;
 840        rev.parents = 1;
 841        rev.limited = 1;
 842
 843        commit_list_insert(start_commit, &rev.commits);
 844
 845        args[0] = filename;
 846        args[1] = NULL;
 847        diff_tree_setup_paths(args, &rev.pruning);
 848        prepare_revision_walk(&rev);
 849        process_commits(&rev, filename, &initial);
 850
 851        buf = blame_contents;
 852        for (max_digits = 1, i = 10; i <= num_blame_lines + 1; max_digits++)
 853                i *= 10;
 854
 855        longest_file = 0;
 856        longest_author = 0;
 857        found_rename = 0;
 858        for (i = 0; i < num_blame_lines; i++) {
 859                struct commit *c = blame_lines[i];
 860                struct util_info* u;
 861                if (!c)
 862                        c = initial;
 863                u = c->util;
 864
 865                if (!found_rename && strcmp(filename, u->pathname))
 866                        found_rename = 1;
 867                if (longest_file < strlen(u->pathname))
 868                        longest_file = strlen(u->pathname);
 869                get_commit_info(c, &ci);
 870                if (longest_author < strlen(ci.author))
 871                        longest_author = strlen(ci.author);
 872        }
 873
 874        for (i = 0; i < num_blame_lines; i++) {
 875                struct commit *c = blame_lines[i];
 876                struct util_info* u;
 877
 878                if (!c)
 879                        c = initial;
 880
 881                u = c->util;
 882                get_commit_info(c, &ci);
 883                fwrite(sha1_to_hex(c->object.sha1), sha1_len, 1, stdout);
 884                if(compatibility) {
 885                        printf("\t(%10s\t%10s\t%d)", ci.author,
 886                               format_time(ci.author_time, ci.author_tz,
 887                                           show_raw_time),
 888                               i+1);
 889                } else {
 890                        if (found_rename)
 891                                printf(" %-*.*s", longest_file, longest_file,
 892                                       u->pathname);
 893                        printf(" (%-*.*s %10s %*d) ",
 894                               longest_author, longest_author, ci.author,
 895                               format_time(ci.author_time, ci.author_tz,
 896                                           show_raw_time),
 897                               max_digits, i+1);
 898                }
 899
 900                if(i == num_blame_lines - 1) {
 901                        fwrite(buf, blame_len - (buf - blame_contents),
 902                               1, stdout);
 903                        if(blame_contents[blame_len-1] != '\n')
 904                                putc('\n', stdout);
 905                } else {
 906                        char* next_buf = strchr(buf, '\n') + 1;
 907                        fwrite(buf, next_buf - buf, 1, stdout);
 908                        buf = next_buf;
 909                }
 910        }
 911
 912        if (DEBUG) {
 913                printf("num get patch: %d\n", num_get_patch);
 914                printf("num commits: %d\n", num_commits);
 915                printf("patch time: %f\n", patch_time / 1000000.0);
 916                printf("initial: %s\n", sha1_to_hex(initial->object.sha1));
 917        }
 918
 919        return 0;
 920}