14 struct commit** blame_lines;
21 unsigned char sha1[20]; /* blob sha, not commit! */
29 int off1, len1; // ---
30 int off2, len2; // +++
39 static void get_blob(struct commit* commit);
41 int num_get_patch = 0;
44 struct patch* get_patch(struct commit* commit, struct commit* other)
46 struct patch* ret = xmalloc(sizeof(struct patch));
50 struct util_info* info_c = (struct util_info*) commit->object.util;
51 struct util_info* info_o = (struct util_info*) other->object.util;
53 if(!memcmp(info_c->sha1, info_o->sha1, 20))
59 FILE* fout = fopen("/tmp/git-blame-tmp1", "w");
61 die("fopen tmp1 failed: %s", strerror(errno));
63 if(fwrite(info_c->buf, info_c->size, 1, fout) != 1)
64 die("fwrite 1 failed: %s", strerror(errno));
67 fout = fopen("/tmp/git-blame-tmp2", "w");
69 die("fopen tmp2 failed: %s", strerror(errno));
71 if(fwrite(info_o->buf, info_o->size, 1, fout) != 1)
72 die("fwrite 2 failed: %s", strerror(errno));
75 FILE* fin = popen("diff -u0 /tmp/git-blame-tmp1 /tmp/git-blame-tmp2", "r");
77 die("popen failed: %s", strerror(errno));
80 while(fgets(buf, sizeof(buf), fin)) {
81 if(buf[0] != '@' || buf[1] != '@')
85 printf("chunk line: %s", buf);
87 ret->chunks = xrealloc(ret->chunks, sizeof(struct chunk)*ret->num);
88 struct chunk* chunk = &ret->chunks[ret->num-1];
90 assert(!strncmp(buf, "@@ -", 4));
93 char* sp = index(start, ' ');
95 if(index(start, ',')) {
96 int ret = sscanf(start, "%d,%d", &chunk->off1, &chunk->len1);
99 int ret = sscanf(start, "%d", &chunk->off1);
106 sp = index(start, ' ');
108 if(index(start, ',')) {
109 int ret = sscanf(start, "%d,%d", &chunk->off2, &chunk->len2);
112 int ret = sscanf(start, "%d", &chunk->off2);
123 assert(chunk->off1 >= 0);
124 assert(chunk->off2 >= 0);
132 void free_patch(struct patch* p)
138 static int get_blob_sha1_internal(unsigned char *sha1, const char *base, int baselen,
139 const char *pathname, unsigned mode, int stage);
142 static unsigned char blob_sha1[20];
143 static int get_blob_sha1(struct tree* t, const char* pathname, unsigned char* sha1)
145 const char *pathspec[2];
146 pathspec[0] = pathname;
148 memset(blob_sha1, 0, sizeof(blob_sha1));
149 read_tree_recursive(t, "", 0, 0, pathspec, get_blob_sha1_internal);
152 for(i = 0; i < 20; i++) {
153 if(blob_sha1[i] != 0)
160 memcpy(sha1, blob_sha1, 20);
164 static int get_blob_sha1_internal(unsigned char *sha1, const char *base, int baselen,
165 const char *pathname, unsigned mode, int stage)
167 // printf("Got blob: %s base: '%s' baselen: %d pathname: '%s' mode: %o stage: %d\n",
168 // sha1_to_hex(sha1), base, baselen, pathname, mode, stage);
171 return READ_TREE_RECURSIVE;
173 memcpy(blob_sha1, sha1, 20);
177 static void get_blob(struct commit* commit)
179 struct util_info* info = commit->object.util;
185 info->buf = read_sha1_file(info->sha1, type, &info->size);
186 assert(!strcmp(type, "blob"));
189 void print_patch(struct patch* p)
191 printf("Num chunks: %d\n", p->num);
193 for(i = 0; i < p->num; i++) {
194 printf("%d,%d %d,%d\n", p->chunks[i].off1, p->chunks[i].len1, p->chunks[i].off2, p->chunks[i].len2);
199 // p is a patch from commit to other.
200 void fill_line_map(struct commit* commit, struct commit* other, struct patch* p)
202 int num_lines = ((struct util_info*) commit->object.util)->num_lines;
203 int* line_map = ((struct util_info*) commit->object.util)->line_map;
204 int num_lines2 = ((struct util_info*) other->object.util)->num_lines;
205 int* line_map2 = ((struct util_info*) other->object.util)->line_map;
212 for(i1 = 0; i1 < num_lines; i1++)
216 printf("num lines 1: %d num lines 2: %d\n", num_lines, num_lines2);
218 for(i1 = 0, i2 = 0; i1 < num_lines; i1++, i2++) {
220 printf("%d %d\n", i1, i2);
225 line_map[i1] = line_map2[i2];
227 struct chunk* chunk = NULL;
228 if(cur_chunk < p->num)
229 chunk = &p->chunks[cur_chunk];
231 if(chunk && chunk->off1 == i1) {
243 int map_line(struct commit* commit, int line)
245 struct util_info* info = commit->object.util;
246 assert(line >= 0 && line < info->num_lines);
247 return info->line_map[line];
250 int fill_util_info(struct commit* commit, const char* path)
252 if(commit->object.util)
255 struct util_info* util = xmalloc(sizeof(struct util_info));
258 util->num_lines = -1;
259 util->line_map = NULL;
261 commit->object.util = util;
263 if(get_blob_sha1(commit->tree, path, util->sha1))
269 void alloc_line_map(struct commit* commit)
271 struct util_info* util = commit->object.util;
280 for(i = 0; i < util->size; i++) {
281 if(util->buf[i] == '\n')
284 util->line_map = xmalloc(sizeof(int)*util->num_lines);
287 void copy_line_map(struct commit* dst, struct commit* src)
289 struct util_info* u_dst = dst->object.util;
290 struct util_info* u_src = src->object.util;
292 u_dst->line_map = u_src->line_map;
293 u_dst->num_lines = u_src->num_lines;
294 u_dst->buf = u_src->buf;
295 u_dst->size = u_src->size;
298 void process_commits(struct commit_list* list, const char* path)
303 struct commit* commit = pop_commit(&list);
304 struct commit_list* parents;
305 struct util_info* info;
307 info = commit->object.util;
310 printf("\nProcessing commit: %d %s\n", num_commits, sha1_to_hex(commit->object.sha1));
311 for(parents = commit->parents;
312 parents != NULL; parents = parents->next) {
313 struct commit* parent = parents->item;
315 if(parse_commit(parent) < 0)
316 die("parse_commit error");
319 printf("parent: %s\n", sha1_to_hex(parent->object.sha1));
321 if(fill_util_info(parent, path))
324 // Temporarily assign everything to the parent.
326 for(i = 0; i < num_blame_lines; i++) {
327 if(blame_lines[i] == commit) {
329 blame_lines[i] = parent;
336 struct patch* patch = get_patch(parent, commit);
337 if(patch->num == 0) {
338 copy_line_map(parent, commit);
340 alloc_line_map(parent);
341 fill_line_map(parent, commit, patch);
344 for(i = 0; i < patch->num; i++) {
346 for(l = 0; l < patch->chunks[i].len2; l++) {
347 int mapped_line = map_line(commit, patch->chunks[i].off2 + l);
348 if(mapped_line != -1 && blame_lines[mapped_line] == parent)
349 blame_lines[mapped_line] = commit;
358 struct commit_list* get_commit_list(struct commit* commit, const char* pathname)
360 struct commit_list* ret = NULL;
361 struct commit_list* process = NULL;
362 unsigned char sha1[20];
364 commit_list_insert(commit, &process);
367 struct commit* com = pop_commit(&process);
368 if(com->object.flags & SEEN)
371 com->object.flags |= SEEN;
372 commit_list_insert(com, &ret);
373 struct commit_list* parents;
377 for(parents = com->parents;
378 parents != NULL; parents = parents->next) {
379 struct commit* parent = parents->item;
381 parse_commit(parent);
383 if(!get_blob_sha1(parent->tree, pathname, sha1))
384 commit_list_insert(parent, &process);
391 int main(int argc, const char **argv)
393 unsigned char sha1[20];
394 struct commit *commit;
395 const char* filename;
398 setup_git_directory();
401 die("Usage: blame commit-ish file");
403 if (get_sha1(argv[1], sha1))
404 die("get_sha1 failed");
406 commit = lookup_commit_reference(sha1);
410 struct commit_list* list = get_commit_list(commit, filename);
411 sort_in_topological_order(&list, 1);
413 if(fill_util_info(commit, filename)) {
414 printf("%s not found in %s\n", filename, argv[1]);
417 alloc_line_map(commit);
419 struct util_info* util = commit->object.util;
420 num_blame_lines = util->num_lines;
421 blame_lines = xmalloc(sizeof(struct commit*)*num_blame_lines);
424 for(i = 0; i < num_blame_lines; i++) {
425 blame_lines[i] = commit;
427 ((struct util_info*) commit->object.util)->line_map[i] = i;
430 process_commits(list, filename);
432 for(i = 0; i < num_blame_lines; i++) {
433 printf("%d %s\n", i+1-1, sha1_to_hex(blame_lines[i]->object.sha1));
434 // printf("%d %s\n", i+1-1, find_unique_abbrev(blame_lines[i]->object.sha1, 6));
438 printf("num get patch: %d\n", num_get_patch);
439 printf("num commits: %d\n", num_commits);