--- /dev/null
+/*
+ * Copyright (C) 2006, Fredrik Kuivinen <freku045@student.liu.se>
+ */
+
+#include <assert.h>
+#include <time.h>
+#include <sys/time.h>
+
+#include "cache.h"
+#include "refs.h"
+#include "tag.h"
+#include "commit.h"
+#include "tree.h"
+#include "blob.h"
+#include "diff.h"
+#include "revision.h"
+
+#define DEBUG 0
+
+struct commit **blame_lines;
+int num_blame_lines;
+
+struct util_info {
+ int *line_map;
+ unsigned char sha1[20]; /* blob sha, not commit! */
+ char *buf;
+ unsigned long size;
+ int num_lines;
+// const char* path;
+};
+
+struct chunk {
+ int off1, len1; // ---
+ int off2, len2; // +++
+};
+
+struct patch {
+ struct chunk *chunks;
+ int num;
+};
+
+static void get_blob(struct commit *commit);
+
+/* Only used for statistics */
+static int num_get_patch = 0;
+static int num_commits = 0;
+static int patch_time = 0;
+
+#define TEMPFILE_PATH_LEN 60
+static struct patch *get_patch(struct commit *commit, struct commit *other)
+{
+ struct patch *ret;
+ struct util_info *info_c = (struct util_info *)commit->object.util;
+ struct util_info *info_o = (struct util_info *)other->object.util;
+ char tmp_path1[TEMPFILE_PATH_LEN], tmp_path2[TEMPFILE_PATH_LEN];
+ char diff_cmd[TEMPFILE_PATH_LEN*2 + 20];
+ struct timeval tv_start, tv_end;
+ int fd;
+ FILE *fin;
+ char buf[1024];
+
+ ret = xmalloc(sizeof(struct patch));
+ ret->chunks = NULL;
+ ret->num = 0;
+
+ get_blob(commit);
+ get_blob(other);
+
+ gettimeofday(&tv_start, NULL);
+
+ fd = git_mkstemp(tmp_path1, TEMPFILE_PATH_LEN, "git-blame-XXXXXX");
+ if (fd < 0)
+ die("unable to create temp-file: %s", strerror(errno));
+
+ if (xwrite(fd, info_c->buf, info_c->size) != info_c->size)
+ die("write failed: %s", strerror(errno));
+ close(fd);
+
+ fd = git_mkstemp(tmp_path2, TEMPFILE_PATH_LEN, "git-blame-XXXXXX");
+ if (fd < 0)
+ die("unable to create temp-file: %s", strerror(errno));
+
+ if (xwrite(fd, info_o->buf, info_o->size) != info_o->size)
+ die("write failed: %s", strerror(errno));
+ close(fd);
+
+ sprintf(diff_cmd, "diff -u0 %s %s", tmp_path1, tmp_path2);
+ fin = popen(diff_cmd, "r");
+ if (!fin)
+ die("popen failed: %s", strerror(errno));
+
+ while (fgets(buf, sizeof(buf), fin)) {
+ struct chunk *chunk;
+ char *start, *sp;
+
+ if (buf[0] != '@' || buf[1] != '@')
+ continue;
+
+ if (DEBUG)
+ printf("chunk line: %s", buf);
+ ret->num++;
+ ret->chunks = xrealloc(ret->chunks,
+ sizeof(struct chunk) * ret->num);
+ chunk = &ret->chunks[ret->num - 1];
+
+ assert(!strncmp(buf, "@@ -", 4));
+
+ start = buf + 4;
+ sp = index(start, ' ');
+ *sp = '\0';
+ if (index(start, ',')) {
+ int ret =
+ sscanf(start, "%d,%d", &chunk->off1, &chunk->len1);
+ assert(ret == 2);
+ } else {
+ int ret = sscanf(start, "%d", &chunk->off1);
+ assert(ret == 1);
+ chunk->len1 = 1;
+ }
+ *sp = ' ';
+
+ start = sp + 1;
+ sp = index(start, ' ');
+ *sp = '\0';
+ if (index(start, ',')) {
+ int ret =
+ sscanf(start, "%d,%d", &chunk->off2, &chunk->len2);
+ assert(ret == 2);
+ } else {
+ int ret = sscanf(start, "%d", &chunk->off2);
+ assert(ret == 1);
+ chunk->len2 = 1;
+ }
+ *sp = ' ';
+
+ if (chunk->len1 == 0)
+ chunk->off1++;
+ if (chunk->len2 == 0)
+ chunk->off2++;
+
+ if (chunk->off1 > 0)
+ chunk->off1--;
+ if (chunk->off2 > 0)
+ chunk->off2--;
+
+ assert(chunk->off1 >= 0);
+ assert(chunk->off2 >= 0);
+ }
+ pclose(fin);
+ unlink(tmp_path1);
+ unlink(tmp_path2);
+
+ gettimeofday(&tv_end, NULL);
+ patch_time += 1000000 * (tv_end.tv_sec - tv_start.tv_sec) +
+ tv_end.tv_usec - tv_start.tv_usec;
+
+ num_get_patch++;
+ return ret;
+}
+
+static void free_patch(struct patch *p)
+{
+ free(p->chunks);
+ free(p);
+}
+
+static int get_blob_sha1_internal(unsigned char *sha1, const char *base,
+ int baselen, const char *pathname,
+ unsigned mode, int stage);
+
+static unsigned char blob_sha1[20];
+static int get_blob_sha1(struct tree *t, const char *pathname,
+ unsigned char *sha1)
+{
+ int i;
+ const char *pathspec[2];
+ pathspec[0] = pathname;
+ pathspec[1] = NULL;
+ memset(blob_sha1, 0, sizeof(blob_sha1));
+ read_tree_recursive(t, "", 0, 0, pathspec, get_blob_sha1_internal);
+
+ for (i = 0; i < 20; i++) {
+ if (blob_sha1[i] != 0)
+ break;
+ }
+
+ if (i == 20)
+ return -1;
+
+ memcpy(sha1, blob_sha1, 20);
+ return 0;
+}
+
+static int get_blob_sha1_internal(unsigned char *sha1, const char *base,
+ int baselen, const char *pathname,
+ unsigned mode, int stage)
+{
+ if (S_ISDIR(mode))
+ return READ_TREE_RECURSIVE;
+
+ memcpy(blob_sha1, sha1, 20);
+ return -1;
+}
+
+static void get_blob(struct commit *commit)
+{
+ struct util_info *info = commit->object.util;
+ char type[20];
+
+ if (info->buf)
+ return;
+
+ info->buf = read_sha1_file(info->sha1, type, &info->size);
+
+ assert(!strcmp(type, "blob"));
+}
+
+/* For debugging only */
+static void print_patch(struct patch *p)
+{
+ int i;
+ printf("Num chunks: %d\n", p->num);
+ for (i = 0; i < p->num; i++) {
+ printf("%d,%d %d,%d\n", p->chunks[i].off1, p->chunks[i].len1,
+ p->chunks[i].off2, p->chunks[i].len2);
+ }
+}
+
+/* For debugging only */
+static void print_map(struct commit *cmit, struct commit *other)
+{
+ struct util_info *util = cmit->object.util;
+ struct util_info *util2 = other->object.util;
+
+ int i;
+ int max =
+ util->num_lines >
+ util2->num_lines ? util->num_lines : util2->num_lines;
+ int num;
+
+ for (i = 0; i < max; i++) {
+ printf("i: %d ", i);
+ num = -1;
+
+ if (i < util->num_lines) {
+ num = util->line_map[i];
+ printf("%d\t", num);
+ } else
+ printf("\t");
+
+ if (i < util2->num_lines) {
+ int num2 = util2->line_map[i];
+ printf("%d\t", num2);
+ if (num != -1 && num2 != num)
+ printf("---");
+ } else
+ printf("\t");
+
+ printf("\n");
+ }
+}
+
+// p is a patch from commit to other.
+static void fill_line_map(struct commit *commit, struct commit *other,
+ struct patch *p)
+{
+ struct util_info *util = commit->object.util;
+ struct util_info *util2 = other->object.util;
+ int *map = util->line_map;
+ int *map2 = util2->line_map;
+ int cur_chunk = 0;
+ int i1, i2;
+
+ if (p->num && DEBUG)
+ print_patch(p);
+
+ if (DEBUG)
+ printf("num lines 1: %d num lines 2: %d\n", util->num_lines,
+ util2->num_lines);
+
+ for (i1 = 0, i2 = 0; i1 < util->num_lines; i1++, i2++) {
+ struct chunk *chunk = NULL;
+ if (cur_chunk < p->num)
+ chunk = &p->chunks[cur_chunk];
+
+ if (chunk && chunk->off1 == i1) {
+ if (DEBUG && i2 != chunk->off2)
+ printf("i2: %d off2: %d\n", i2, chunk->off2);
+
+ assert(i2 == chunk->off2);
+
+ i1--;
+ i2--;
+ if (chunk->len1 > 0)
+ i1 += chunk->len1;
+
+ if (chunk->len2 > 0)
+ i2 += chunk->len2;
+
+ cur_chunk++;
+ } else {
+ if (i2 >= util2->num_lines)
+ break;
+
+ if (map[i1] != map2[i2] && map[i1] != -1) {
+ if (DEBUG)
+ printf("map: i1: %d %d %p i2: %d %d %p\n",
+ i1, map[i1],
+ i1 != -1 ? blame_lines[map[i1]] : NULL,
+ i2, map2[i2],
+ i2 != -1 ? blame_lines[map2[i2]] : NULL);
+ if (map2[i2] != -1 &&
+ blame_lines[map[i1]] &&
+ !blame_lines[map2[i2]])
+ map[i1] = map2[i2];
+ }
+
+ if (map[i1] == -1 && map2[i2] != -1)
+ map[i1] = map2[i2];
+ }
+
+ if (DEBUG > 1)
+ printf("l1: %d l2: %d i1: %d i2: %d\n",
+ map[i1], map2[i2], i1, i2);
+ }
+}
+
+static int map_line(struct commit *commit, int line)
+{
+ struct util_info *info = commit->object.util;
+ assert(line >= 0 && line < info->num_lines);
+ return info->line_map[line];
+}
+
+static int fill_util_info(struct commit *commit, const char *path)
+{
+ struct util_info *util;
+ if (commit->object.util)
+ return 0;
+
+ util = xmalloc(sizeof(struct util_info));
+
+ if (get_blob_sha1(commit->tree, path, util->sha1)) {
+ free(util);
+ return 1;
+ } else {
+ util->buf = NULL;
+ util->size = 0;
+ util->line_map = NULL;
+ util->num_lines = -1;
+ commit->object.util = util;
+ return 0;
+ }
+}
+
+static void alloc_line_map(struct commit *commit)
+{
+ struct util_info *util = commit->object.util;
+ int i;
+
+ if (util->line_map)
+ return;
+
+ get_blob(commit);
+
+ util->num_lines = 0;
+ for (i = 0; i < util->size; i++) {
+ if (util->buf[i] == '\n')
+ util->num_lines++;
+ }
+ if(util->buf[util->size - 1] != '\n')
+ util->num_lines++;
+
+ util->line_map = xmalloc(sizeof(int) * util->num_lines);
+
+ for (i = 0; i < util->num_lines; i++)
+ util->line_map[i] = -1;
+}
+
+static void init_first_commit(struct commit* commit, const char* filename)
+{
+ struct util_info* util;
+ int i;
+
+ if (fill_util_info(commit, filename))
+ die("fill_util_info failed");
+
+ alloc_line_map(commit);
+
+ util = commit->object.util;
+ num_blame_lines = util->num_lines;
+
+ for (i = 0; i < num_blame_lines; i++)
+ util->line_map[i] = i;
+}
+
+
+static void process_commits(struct rev_info *rev, const char *path,
+ struct commit** initial)
+{
+ int i;
+ struct util_info* util;
+ int lines_left;
+ int *blame_p;
+ int *new_lines;
+ int new_lines_len;
+
+ struct commit* commit = get_revision(rev);
+ assert(commit);
+ init_first_commit(commit, path);
+
+ util = commit->object.util;
+ num_blame_lines = util->num_lines;
+ blame_lines = xmalloc(sizeof(struct commit *) * num_blame_lines);
+ for (i = 0; i < num_blame_lines; i++)
+ blame_lines[i] = NULL;
+
+ lines_left = num_blame_lines;
+ blame_p = xmalloc(sizeof(int) * num_blame_lines);
+ new_lines = xmalloc(sizeof(int) * num_blame_lines);
+ do {
+ struct commit_list *parents;
+ int num_parents;
+ struct util_info *util;
+
+ if (DEBUG)
+ printf("\nProcessing commit: %d %s\n", num_commits,
+ sha1_to_hex(commit->object.sha1));
+
+ if (lines_left == 0)
+ return;
+
+ num_commits++;
+ memset(blame_p, 0, sizeof(int) * num_blame_lines);
+ new_lines_len = 0;
+ num_parents = 0;
+ for (parents = commit->parents;
+ parents != NULL; parents = parents->next)
+ num_parents++;
+
+ if(num_parents == 0)
+ *initial = commit;
+
+ if(fill_util_info(commit, path))
+ continue;
+
+ alloc_line_map(commit);
+ util = commit->object.util;
+
+ for (parents = commit->parents;
+ parents != NULL; parents = parents->next) {
+ struct commit *parent = parents->item;
+ struct patch *patch;
+
+ if (parse_commit(parent) < 0)
+ die("parse_commit error");
+
+ if (DEBUG)
+ printf("parent: %s\n",
+ sha1_to_hex(parent->object.sha1));
+
+ if(fill_util_info(parent, path)) {
+ num_parents--;
+ continue;
+ }
+
+ patch = get_patch(parent, commit);
+ alloc_line_map(parent);
+ fill_line_map(parent, commit, patch);
+
+ for (i = 0; i < patch->num; i++) {
+ int l;
+ for (l = 0; l < patch->chunks[i].len2; l++) {
+ int mapped_line =
+ map_line(commit, patch->chunks[i].off2 + l);
+ if (mapped_line != -1) {
+ blame_p[mapped_line]++;
+ if (blame_p[mapped_line] == num_parents)
+ new_lines[new_lines_len++] = mapped_line;
+ }
+ }
+ }
+ free_patch(patch);
+ }
+
+ if (DEBUG)
+ printf("parents: %d\n", num_parents);
+
+ for (i = 0; i < new_lines_len; i++) {
+ int mapped_line = new_lines[i];
+ if (blame_lines[mapped_line] == NULL) {
+ blame_lines[mapped_line] = commit;
+ lines_left--;
+ if (DEBUG)
+ printf("blame: mapped: %d i: %d\n",
+ mapped_line, i);
+ }
+ }
+ } while ((commit = get_revision(rev)) != NULL);
+}
+
+int main(int argc, const char **argv)
+{
+ int i;
+ struct commit *initial = NULL;
+ unsigned char sha1[20];
+ const char* filename;
+ int num_args;
+ const char* args[10];
+ struct rev_info rev;
+
+ setup_git_directory();
+
+ if (argc != 3)
+ die("Usage: blame commit-ish file");
+
+
+ filename = argv[2];
+
+ {
+ struct commit* commit;
+ if (get_sha1(argv[1], sha1))
+ die("get_sha1 failed");
+ commit = lookup_commit_reference(sha1);
+
+ if (fill_util_info(commit, filename)) {
+ printf("%s not found in %s\n", filename, argv[1]);
+ return 1;
+ }
+ }
+
+ num_args = 0;
+ args[num_args++] = NULL;
+ args[num_args++] = "--topo-order";
+ args[num_args++] = "--remove-empty";
+ args[num_args++] = argv[1];
+ args[num_args++] = "--";
+ args[num_args++] = filename;
+ args[num_args] = NULL;
+
+ setup_revisions(num_args, args, &rev, "HEAD");
+ prepare_revision_walk(&rev);
+ process_commits(&rev, filename, &initial);
+
+ for (i = 0; i < num_blame_lines; i++) {
+ struct commit *c = blame_lines[i];
+ if (!c)
+ c = initial;
+
+ printf("%d %.8s\n", i, sha1_to_hex(c->object.sha1));
+// printf("%d %s\n", i, find_unique_abbrev(blame_lines[i]->object.sha1, 6));
+ }
+
+ if (DEBUG) {
+ printf("num get patch: %d\n", num_get_patch);
+ printf("num commits: %d\n", num_commits);
+ printf("patch time: %f\n", patch_time / 1000000.0);
+ printf("initial: %s\n", sha1_to_hex(initial->object.sha1));
+ }
+
+ return 0;
+}
projects / git.git / commitdiff