Merge branch 'jc/bare'
[git/git.git] / builtin-describe.c
CommitLineData
908e5310
LT
1#include "cache.h"
2#include "commit.h"
635d4134 3#include "tag.h"
908e5310 4#include "refs.h"
9a0eaf83 5#include "builtin.h"
908e5310
LT
6
7#define SEEN (1u << 0)
8
2d9e7c9f
JH
9static const char describe_usage[] =
10"git-describe [--all] [--tags] [--abbrev=<n>] <committish>*";
908e5310 11
96f1e58f
DR
12static int all; /* Default to annotated tags only */
13static int tags; /* But allow any tags if --tags is specified */
2d9e7c9f 14
2d9e7c9f 15static int abbrev = DEFAULT_ABBREV;
908e5310 16
96f1e58f 17static int names, allocs;
908e5310
LT
18static struct commit_name {
19 const struct commit *commit;
64deb858 20 int prio; /* annotated tag = 2, tag = 1, head = 0 */
5a2282de 21 char path[FLEX_ARRAY]; /* more */
908e5310
LT
22} **name_array = NULL;
23
24static struct commit_name *match(struct commit *cmit)
25{
26 int i = names;
27 struct commit_name **p = name_array;
28
29 while (i-- > 0) {
30 struct commit_name *n = *p++;
31 if (n->commit == cmit)
32 return n;
33 }
34 return NULL;
35}
36
64deb858
JH
37static void add_to_known_names(const char *path,
38 const struct commit *commit,
39 int prio)
908e5310
LT
40{
41 int idx;
42 int len = strlen(path)+1;
43 struct commit_name *name = xmalloc(sizeof(struct commit_name) + len);
44
45 name->commit = commit;
f7122265 46 name->prio = prio;
908e5310
LT
47 memcpy(name->path, path, len);
48 idx = names;
49 if (idx >= allocs) {
50 allocs = (idx + 50) * 3 / 2;
51 name_array = xrealloc(name_array, allocs*sizeof(*name_array));
52 }
53 name_array[idx] = name;
54 names = ++idx;
55}
56
8da19775 57static int get_name(const char *path, const unsigned char *sha1, int flag, void *cb_data)
908e5310
LT
58{
59 struct commit *commit = lookup_commit_reference_gently(sha1, 1);
64deb858
JH
60 struct object *object;
61 int prio;
62
908e5310
LT
63 if (!commit)
64 return 0;
64deb858 65 object = parse_object(sha1);
2d9e7c9f
JH
66 /* If --all, then any refs are used.
67 * If --tags, then any tags are used.
68 * Otherwise only annotated tags are used.
69 */
64deb858 70 if (!strncmp(path, "refs/tags/", 10)) {
1974632c 71 if (object->type == OBJ_TAG)
64deb858
JH
72 prio = 2;
73 else
74 prio = 1;
75 }
76 else
77 prio = 0;
78
635d4134 79 if (!all) {
64deb858
JH
80 if (!prio)
81 return 0;
82 if (!tags && prio < 2)
635d4134 83 return 0;
635d4134 84 }
64deb858 85 add_to_known_names(all ? path + 5 : path + 10, commit, prio);
908e5310
LT
86 return 0;
87}
88
89static int compare_names(const void *_a, const void *_b)
90{
91 struct commit_name *a = *(struct commit_name **)_a;
92 struct commit_name *b = *(struct commit_name **)_b;
93 unsigned long a_date = a->commit->date;
94 unsigned long b_date = b->commit->date;
64deb858
JH
95
96 if (a->prio != b->prio)
97 return b->prio - a->prio;
908e5310
LT
98 return (a_date > b_date) ? -1 : (a_date == b_date) ? 0 : 1;
99}
100
554fe20d 101static void describe(const char *arg, int last_one)
908e5310 102{
4c34a2c5
JH
103 unsigned char sha1[20];
104 struct commit *cmit;
908e5310
LT
105 struct commit_list *list;
106 static int initialized = 0;
107 struct commit_name *n;
108
31fff305
DL
109 if (get_sha1(arg, sha1))
110 die("Not a valid object name %s", arg);
4c34a2c5
JH
111 cmit = lookup_commit_reference(sha1);
112 if (!cmit)
31fff305 113 die("%s is not a valid '%s' object", arg, commit_type);
4c34a2c5 114
908e5310
LT
115 if (!initialized) {
116 initialized = 1;
cb5d709f 117 for_each_ref(get_name, NULL);
908e5310
LT
118 qsort(name_array, names, sizeof(*name_array), compare_names);
119 }
120
121 n = match(cmit);
122 if (n) {
123 printf("%s\n", n->path);
124 return;
125 }
126
127 list = NULL;
128 commit_list_insert(cmit, &list);
129 while (list) {
130 struct commit *c = pop_most_recent_commit(&list, SEEN);
131 n = match(c);
132 if (n) {
4cdf78bf 133 printf("%s-g%s\n", n->path,
2d9e7c9f 134 find_unique_abbrev(cmit->object.sha1, abbrev));
181dc776
JH
135 if (!last_one)
136 clear_commit_marks(cmit, SEEN);
8c23b6fa 137 return;
908e5310
LT
138 }
139 }
8c23b6fa 140 die("cannot describe '%s'", sha1_to_hex(cmit->object.sha1));
908e5310
LT
141}
142
9a0eaf83 143int cmd_describe(int argc, const char **argv, const char *prefix)
908e5310
LT
144{
145 int i;
146
147 for (i = 1; i < argc; i++) {
148 const char *arg = argv[i];
908e5310 149
4c34a2c5
JH
150 if (*arg != '-')
151 break;
152 else if (!strcmp(arg, "--all"))
908e5310 153 all = 1;
4c34a2c5 154 else if (!strcmp(arg, "--tags"))
2d9e7c9f 155 tags = 1;
4c34a2c5 156 else if (!strncmp(arg, "--abbrev=", 9)) {
2d9e7c9f 157 abbrev = strtoul(arg + 9, NULL, 10);
f7122265 158 if (abbrev < MINIMUM_ABBREV || 40 < abbrev)
2d9e7c9f 159 abbrev = DEFAULT_ABBREV;
2d9e7c9f 160 }
4c34a2c5 161 else
908e5310 162 usage(describe_usage);
908e5310 163 }
4c34a2c5 164
8c599c74 165 save_commit_buffer = 0;
8112894d 166
5b6df8e4 167 if (argc <= i)
fec9ebf1 168 describe("HEAD", 1);
4c34a2c5 169 else
fec9ebf1
JH
170 while (i < argc) {
171 describe(argv[i], (i == argc - 1));
172 i++;
173 }
4c34a2c5 174
908e5310
LT
175 return 0;
176}