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
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
|
#include "cache.h"
#include "commit.h"
#include "tag.h"
#include "refs.h"
#define SEEN (1u << 0)
static const char describe_usage[] =
"git-describe [--all] [--tags] [--abbrev=<n>] <committish>*";
static int all; /* Default to annotated tags only */
static int tags; /* But allow any tags if --tags is specified */
static int abbrev = DEFAULT_ABBREV;
static int names, allocs;
static struct commit_name {
const struct commit *commit;
int prio; /* annotated tag = 2, tag = 1, head = 0 */
char path[FLEX_ARRAY]; /* more */
} **name_array = NULL;
static struct commit_name *match(struct commit *cmit)
{
int i = names;
struct commit_name **p = name_array;
while (i-- > 0) {
struct commit_name *n = *p++;
if (n->commit == cmit)
return n;
}
return NULL;
}
static void add_to_known_names(const char *path,
const struct commit *commit,
int prio)
{
int idx;
int len = strlen(path)+1;
struct commit_name *name = xmalloc(sizeof(struct commit_name) + len);
name->commit = commit;
name->prio = prio;
memcpy(name->path, path, len);
idx = names;
if (idx >= allocs) {
allocs = (idx + 50) * 3 / 2;
name_array = xrealloc(name_array, allocs*sizeof(*name_array));
}
name_array[idx] = name;
names = ++idx;
}
static int get_name(const char *path, const unsigned char *sha1, int flag, void *cb_data)
{
struct commit *commit = lookup_commit_reference_gently(sha1, 1);
struct object *object;
int prio;
if (!commit)
return 0;
object = parse_object(sha1);
/* If --all, then any refs are used.
* If --tags, then any tags are used.
* Otherwise only annotated tags are used.
*/
if (!strncmp(path, "refs/tags/", 10)) {
if (object->type == OBJ_TAG)
prio = 2;
else
prio = 1;
}
else
prio = 0;
if (!all) {
if (!prio)
return 0;
if (!tags && prio < 2)
return 0;
}
add_to_known_names(all ? path + 5 : path + 10, commit, prio);
return 0;
}
static int compare_names(const void *_a, const void *_b)
{
struct commit_name *a = *(struct commit_name **)_a;
struct commit_name *b = *(struct commit_name **)_b;
unsigned long a_date = a->commit->date;
unsigned long b_date = b->commit->date;
if (a->prio != b->prio)
return b->prio - a->prio;
return (a_date > b_date) ? -1 : (a_date == b_date) ? 0 : 1;
}
static void describe(const char *arg, int last_one)
{
unsigned char sha1[20];
struct commit *cmit;
struct commit_list *list;
static int initialized = 0;
struct commit_name *n;
if (get_sha1(arg, sha1))
die("Not a valid object name %s", arg);
cmit = lookup_commit_reference(sha1);
if (!cmit)
die("%s is not a valid '%s' object", arg, commit_type);
if (!initialized) {
initialized = 1;
for_each_ref(get_name, NULL);
qsort(name_array, names, sizeof(*name_array), compare_names);
}
n = match(cmit);
if (n) {
printf("%s\n", n->path);
return;
}
list = NULL;
commit_list_insert(cmit, &list);
while (list) {
struct commit *c = pop_most_recent_commit(&list, SEEN);
n = match(c);
if (n) {
printf("%s-g%s\n", n->path,
find_unique_abbrev(cmit->object.sha1, abbrev));
if (!last_one)
clear_commit_marks(cmit, SEEN);
return;
}
}
die("cannot describe '%s'", sha1_to_hex(cmit->object.sha1));
}
int main(int argc, char **argv)
{
int i;
for (i = 1; i < argc; i++) {
const char *arg = argv[i];
if (*arg != '-')
break;
else if (!strcmp(arg, "--all"))
all = 1;
else if (!strcmp(arg, "--tags"))
tags = 1;
else if (!strncmp(arg, "--abbrev=", 9)) {
abbrev = strtoul(arg + 9, NULL, 10);
if (abbrev < MINIMUM_ABBREV || 40 < abbrev)
abbrev = DEFAULT_ABBREV;
}
else
usage(describe_usage);
}
setup_git_directory();
if (argc <= i)
describe("HEAD", 1);
else
while (i < argc) {
describe(argv[i], (i == argc - 1));
i++;
}
return 0;
}
|
