summaryrefslogtreecommitdiff
path: root/commit.c
blob: 911f6435a74b93f6d25c6852d1814fa8dbaf626e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
#include "commit.h"
#include "cache.h"
#include <string.h>
#include <limits.h>
 
const char *commit_type = "commit";
 
struct commit *lookup_commit(unsigned char *sha1)
{
	struct object *obj = lookup_object(sha1);
	if (!obj) {
		struct commit *ret = malloc(sizeof(struct commit));
		memset(ret, 0, sizeof(struct commit));
		created_object(sha1, &ret->object);
		return ret;
	}
	if (obj->parsed && obj->type != commit_type) {
		error("Object %s is a %s, not a commit", 
		      sha1_to_hex(sha1), obj->type);
		return NULL;
	}
	return (struct commit *) obj;
}
 
static unsigned long parse_commit_date(const char *buf)
{
	unsigned long date;
 
	if (memcmp(buf, "author", 6))
		return 0;
	while (*buf++ != '\n')
		/* nada */;
	if (memcmp(buf, "committer", 9))
		return 0;
	while (*buf++ != '>')
		/* nada */;
	date = strtoul(buf, NULL, 10);
	if (date == ULONG_MAX)
		date = 0;
	return date;
}
 
int parse_commit(struct commit *item)
{
	char type[20];
	void * buffer, *bufptr;
	unsigned long size;
	unsigned char parent[20];
	if (item->object.parsed)
		return 0;
	item->object.parsed = 1;
	buffer = bufptr = read_sha1_file(item->object.sha1, type, &size);
	if (!buffer)
		return error("Could not read %s",
			     sha1_to_hex(item->object.sha1));
	if (strcmp(type, commit_type))
		return error("Object %s not a commit",
			     sha1_to_hex(item->object.sha1));
	item->object.type = commit_type;
	get_sha1_hex(bufptr + 5, parent);
	item->tree = lookup_tree(parent);
	add_ref(&item->object, &item->tree->object);
	bufptr += 46; /* "tree " + "hex sha1" + "\n" */
	while (!memcmp(bufptr, "parent ", 7) &&
	       !get_sha1_hex(bufptr + 7, parent)) {
		struct commit *new_parent = lookup_commit(parent);
		commit_list_insert(new_parent, &item->parents);
		add_ref(&item->object, &new_parent->object);
		bufptr += 48;
	}
	item->date = parse_commit_date(bufptr);
	free(buffer);
	return 0;
}
 
void commit_list_insert(struct commit *item, struct commit_list **list_p)
{
	struct commit_list *new_list = malloc(sizeof(struct commit_list));
	new_list->item = item;
	new_list->next = *list_p;
	*list_p = new_list;
}
 
void free_commit_list(struct commit_list *list)
{
	while (list) {
		struct commit_list *temp = list;
		list = temp->next;
		free(temp);
	}
}
 
static void insert_by_date(struct commit_list **list, struct commit *item)
{
	struct commit_list **pp = list;
	struct commit_list *p;
	while ((p = *pp) != NULL) {
		if (p->item->date < item->date) {
			break;
		}
		pp = &p->next;
	}
	commit_list_insert(item, pp);
}
 
 
void sort_by_date(struct commit_list **list)
{
	struct commit_list *ret = NULL;
	while (*list) {
		insert_by_date(&ret, (*list)->item);
		*list = (*list)->next;
	}
	*list = ret;
}
 
struct commit *pop_most_recent_commit(struct commit_list **list)
{
	struct commit *ret = (*list)->item;
	struct commit_list *parents = ret->parents;
	struct commit_list *old = *list;
 
	*list = (*list)->next;
	free(old);
 
	while (parents) {
		parse_commit(parents->item);
		insert_by_date(list, parents->item);
		parents = parents->next;
	}
	return ret;
}