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Commit | Line | Data |
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175785e5 DB |
1 | #include "commit.h" |
2 | #include "cache.h" | |
3 | #include <string.h> | |
b2c00718 | 4 | #include <limits.h> |
175785e5 DB |
5 | |
6 | const char *commit_type = "commit"; | |
7 | ||
8 | struct commit *lookup_commit(unsigned char *sha1) | |
9 | { | |
10 | struct object *obj = lookup_object(sha1); | |
11 | if (!obj) { | |
12 | struct commit *ret = malloc(sizeof(struct commit)); | |
13 | memset(ret, 0, sizeof(struct commit)); | |
14 | created_object(sha1, &ret->object); | |
15 | return ret; | |
16 | } | |
17 | if (obj->parsed && obj->type != commit_type) { | |
18 | error("Object %s is a %s, not a commit", | |
19 | sha1_to_hex(sha1), obj->type); | |
20 | return NULL; | |
21 | } | |
22 | return (struct commit *) obj; | |
23 | } | |
24 | ||
25 | static unsigned long parse_commit_date(const char *buf) | |
26 | { | |
27 | unsigned long date; | |
28 | ||
29 | if (memcmp(buf, "author", 6)) | |
30 | return 0; | |
31 | while (*buf++ != '\n') | |
32 | /* nada */; | |
33 | if (memcmp(buf, "committer", 9)) | |
34 | return 0; | |
35 | while (*buf++ != '>') | |
36 | /* nada */; | |
37 | date = strtoul(buf, NULL, 10); | |
38 | if (date == ULONG_MAX) | |
39 | date = 0; | |
40 | return date; | |
41 | } | |
42 | ||
43 | int parse_commit(struct commit *item) | |
44 | { | |
45 | char type[20]; | |
46 | void * buffer, *bufptr; | |
47 | unsigned long size; | |
48 | unsigned char parent[20]; | |
49 | if (item->object.parsed) | |
50 | return 0; | |
51 | item->object.parsed = 1; | |
52 | buffer = bufptr = read_sha1_file(item->object.sha1, type, &size); | |
53 | if (!buffer) | |
54 | return error("Could not read %s", | |
55 | sha1_to_hex(item->object.sha1)); | |
56 | if (strcmp(type, commit_type)) | |
57 | return error("Object %s not a commit", | |
58 | sha1_to_hex(item->object.sha1)); | |
59 | item->object.type = commit_type; | |
60 | get_sha1_hex(bufptr + 5, parent); | |
61 | item->tree = lookup_tree(parent); | |
62 | add_ref(&item->object, &item->tree->object); | |
63 | bufptr += 46; /* "tree " + "hex sha1" + "\n" */ | |
64 | while (!memcmp(bufptr, "parent ", 7) && | |
65 | !get_sha1_hex(bufptr + 7, parent)) { | |
dd97f850 DB |
66 | struct commit *new_parent = lookup_commit(parent); |
67 | commit_list_insert(new_parent, &item->parents); | |
68 | add_ref(&item->object, &new_parent->object); | |
175785e5 DB |
69 | bufptr += 48; |
70 | } | |
71 | item->date = parse_commit_date(bufptr); | |
72 | free(buffer); | |
73 | return 0; | |
74 | } | |
75 | ||
dd97f850 DB |
76 | void commit_list_insert(struct commit *item, struct commit_list **list_p) |
77 | { | |
78 | struct commit_list *new_list = malloc(sizeof(struct commit_list)); | |
79 | new_list->item = item; | |
80 | new_list->next = *list_p; | |
81 | *list_p = new_list; | |
82 | } | |
83 | ||
175785e5 DB |
84 | void free_commit_list(struct commit_list *list) |
85 | { | |
86 | while (list) { | |
87 | struct commit_list *temp = list; | |
88 | list = temp->next; | |
89 | free(temp); | |
90 | } | |
91 | } | |
dd97f850 DB |
92 | |
93 | static void insert_by_date(struct commit_list **list, struct commit *item) | |
94 | { | |
95 | struct commit_list **pp = list; | |
96 | struct commit_list *p; | |
97 | while ((p = *pp) != NULL) { | |
98 | if (p->item->date < item->date) { | |
99 | break; | |
100 | } | |
101 | pp = &p->next; | |
102 | } | |
103 | commit_list_insert(item, pp); | |
104 | } | |
105 | ||
106 | ||
107 | void sort_by_date(struct commit_list **list) | |
108 | { | |
109 | struct commit_list *ret = NULL; | |
110 | while (*list) { | |
111 | insert_by_date(&ret, (*list)->item); | |
112 | *list = (*list)->next; | |
113 | } | |
114 | *list = ret; | |
115 | } | |
116 | ||
117 | struct commit *pop_most_recent_commit(struct commit_list **list) | |
118 | { | |
119 | struct commit *ret = (*list)->item; | |
120 | struct commit_list *parents = ret->parents; | |
121 | struct commit_list *old = *list; | |
122 | ||
123 | *list = (*list)->next; | |
124 | free(old); | |
125 | ||
126 | while (parents) { | |
127 | parse_commit(parents->item); | |
128 | insert_by_date(list, parents->item); | |
129 | parents = parents->next; | |
130 | } | |
131 | return ret; | |
132 | } |