7 const char *commit_type = "commit";
9 static struct commit *check_commit(struct object *obj, unsigned char *sha1)
11 if (obj->type != commit_type) {
12 error("Object %s is a %s, not a commit",
13 sha1_to_hex(sha1), obj->type);
16 return (struct commit *) obj;
19 struct commit *lookup_commit_reference(unsigned char *sha1)
21 struct object *obj = parse_object(sha1);
25 if (obj->type == tag_type)
26 obj = ((struct tag *)obj)->tagged;
27 return check_commit(obj, sha1);
30 struct commit *lookup_commit(unsigned char *sha1)
32 struct object *obj = lookup_object(sha1);
34 struct commit *ret = xmalloc(sizeof(struct commit));
35 memset(ret, 0, sizeof(struct commit));
36 created_object(sha1, &ret->object);
37 ret->object.type = commit_type;
41 obj->type = commit_type;
42 return check_commit(obj, sha1);
45 static unsigned long parse_commit_date(const char *buf)
49 if (memcmp(buf, "author", 6))
51 while (*buf++ != '\n')
53 if (memcmp(buf, "committer", 9))
57 date = strtoul(buf, NULL, 10);
58 if (date == ULONG_MAX)
63 int parse_commit_buffer(struct commit *item, void *buffer, unsigned long size)
65 void *bufptr = buffer;
66 unsigned char parent[20];
68 if (item->object.parsed)
70 item->object.parsed = 1;
71 get_sha1_hex(bufptr + 5, parent);
72 item->tree = lookup_tree(parent);
74 add_ref(&item->object, &item->tree->object);
75 bufptr += 46; /* "tree " + "hex sha1" + "\n" */
76 while (!memcmp(bufptr, "parent ", 7) &&
77 !get_sha1_hex(bufptr + 7, parent)) {
78 struct commit *new_parent = lookup_commit(parent);
80 commit_list_insert(new_parent, &item->parents);
81 add_ref(&item->object, &new_parent->object);
85 item->date = parse_commit_date(bufptr);
89 int parse_commit(struct commit *item)
96 if (item->object.parsed)
98 buffer = read_sha1_file(item->object.sha1, type, &size);
100 return error("Could not read %s",
101 sha1_to_hex(item->object.sha1));
102 if (strcmp(type, commit_type)) {
104 return error("Object %s not a commit",
105 sha1_to_hex(item->object.sha1));
107 ret = parse_commit_buffer(item, buffer, size);
112 void commit_list_insert(struct commit *item, struct commit_list **list_p)
114 struct commit_list *new_list = xmalloc(sizeof(struct commit_list));
115 new_list->item = item;
116 new_list->next = *list_p;
120 void free_commit_list(struct commit_list *list)
123 struct commit_list *temp = list;
129 static void insert_by_date(struct commit_list **list, struct commit *item)
131 struct commit_list **pp = list;
132 struct commit_list *p;
133 while ((p = *pp) != NULL) {
134 if (p->item->date < item->date) {
139 commit_list_insert(item, pp);
143 void sort_by_date(struct commit_list **list)
145 struct commit_list *ret = NULL;
147 insert_by_date(&ret, (*list)->item);
148 *list = (*list)->next;
153 struct commit *pop_most_recent_commit(struct commit_list **list,
156 struct commit *ret = (*list)->item;
157 struct commit_list *parents = ret->parents;
158 struct commit_list *old = *list;
160 *list = (*list)->next;
164 struct commit *commit = parents->item;
165 parse_commit(commit);
166 if (!(commit->object.flags & mark)) {
167 commit->object.flags |= mark;
168 insert_by_date(list, commit);
170 parents = parents->next;