object.h: Add OBJECT_ARRAY_INIT macro and make use of it.
[git/git.git] / builtin / name-rev.c
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d6b64ed0 1#include "builtin.h"
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2#include "cache.h"
3#include "commit.h"
4#include "tag.h"
5#include "refs.h"
edefb1a2 6#include "parse-options.h"
bd321bcc 7
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8#define CUTOFF_DATE_SLOP 86400 /* one day */
9
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10typedef struct rev_name {
11 const char *tip_name;
bd321bcc 12 int generation;
ac076c29 13 int distance;
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14} rev_name;
15
16static long cutoff = LONG_MAX;
17
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18/* How many generations are maximally preferred over _one_ merge traversal? */
19#define MERGE_TRAVERSAL_WEIGHT 65535
20
bd321bcc 21static void name_rev(struct commit *commit,
ac076c29 22 const char *tip_name, int generation, int distance,
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23 int deref)
24{
d3ff6f55 25 struct rev_name *name = (struct rev_name *)commit->util;
bd321bcc 26 struct commit_list *parents;
f2e6f1c9 27 int parent_number = 1;
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28
29 if (!commit->object.parsed)
30 parse_commit(commit);
31
32 if (commit->date < cutoff)
33 return;
34
35 if (deref) {
36 char *new_name = xmalloc(strlen(tip_name)+3);
37 strcpy(new_name, tip_name);
38 strcat(new_name, "^0");
39 tip_name = new_name;
40
41 if (generation)
42 die("generation: %d, but deref?", generation);
43 }
44
45 if (name == NULL) {
46 name = xmalloc(sizeof(rev_name));
d3ff6f55 47 commit->util = name;
bd321bcc 48 goto copy_data;
ac076c29 49 } else if (name->distance > distance) {
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50copy_data:
51 name->tip_name = tip_name;
bd321bcc 52 name->generation = generation;
ac076c29 53 name->distance = distance;
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54 } else
55 return;
56
57 for (parents = commit->parents;
58 parents;
59 parents = parents->next, parent_number++) {
f2e6f1c9 60 if (parent_number > 1) {
59d3f541 61 int len = strlen(tip_name);
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62 char *new_name = xmalloc(len +
63 1 + decimal_length(generation) + /* ~<n> */
64 1 + 2 + /* ^NN */
65 1);
bd321bcc 66
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67 if (len > 2 && !strcmp(tip_name + len - 2, "^0"))
68 len -= 2;
bd321bcc 69 if (generation > 0)
59d3f541 70 sprintf(new_name, "%.*s~%d^%d", len, tip_name,
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71 generation, parent_number);
72 else
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73 sprintf(new_name, "%.*s^%d", len, tip_name,
74 parent_number);
bd321bcc 75
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76 name_rev(parents->item, new_name, 0,
77 distance + MERGE_TRAVERSAL_WEIGHT, 0);
bd321bcc 78 } else {
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79 name_rev(parents->item, tip_name, generation + 1,
80 distance + 1, 0);
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81 }
82 }
83}
84
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85struct name_ref_data {
86 int tags_only;
23615708 87 int name_only;
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88 const char *ref_filter;
89};
90
8da19775 91static int name_ref(const char *path, const unsigned char *sha1, int flags, void *cb_data)
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92{
93 struct object *o = parse_object(sha1);
2afc29aa 94 struct name_ref_data *data = cb_data;
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95 int deref = 0;
96
cc44c765 97 if (data->tags_only && prefixcmp(path, "refs/tags/"))
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98 return 0;
99
100 if (data->ref_filter && fnmatch(data->ref_filter, path, 0))
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101 return 0;
102
1974632c 103 while (o && o->type == OBJ_TAG) {
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104 struct tag *t = (struct tag *) o;
105 if (!t->tagged)
106 break; /* broken repository */
107 o = parse_object(t->tagged->sha1);
108 deref = 1;
109 }
1974632c 110 if (o && o->type == OBJ_COMMIT) {
bd321bcc 111 struct commit *commit = (struct commit *)o;
bd321bcc 112
cc44c765 113 if (!prefixcmp(path, "refs/heads/"))
2c817df2 114 path = path + 11;
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115 else if (data->tags_only
116 && data->name_only
117 && !prefixcmp(path, "refs/tags/"))
118 path = path + 10;
cc44c765 119 else if (!prefixcmp(path, "refs/"))
2c817df2 120 path = path + 5;
bd321bcc 121
9befac47 122 name_rev(commit, xstrdup(path), 0, 0, deref);
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123 }
124 return 0;
125}
126
127/* returns a static buffer */
da2478db 128static const char *get_rev_name(const struct object *o)
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129{
130 static char buffer[1024];
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131 struct rev_name *n;
132 struct commit *c;
133
1974632c 134 if (o->type != OBJ_COMMIT)
a2cf9f44 135 return NULL;
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136 c = (struct commit *) o;
137 n = c->util;
bd321bcc 138 if (!n)
a2cf9f44 139 return NULL;
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140
141 if (!n->generation)
142 return n->tip_name;
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143 else {
144 int len = strlen(n->tip_name);
145 if (len > 2 && !strcmp(n->tip_name + len - 2, "^0"))
146 len -= 2;
147 snprintf(buffer, sizeof(buffer), "%.*s~%d", len, n->tip_name,
148 n->generation);
149
150 return buffer;
151 }
bd321bcc 152}
1f1e895f 153
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154static void show_name(const struct object *obj,
155 const char *caller_name,
156 int always, int allow_undefined, int name_only)
157{
158 const char *name;
159 const unsigned char *sha1 = obj->sha1;
160
161 if (!name_only)
162 printf("%s ", caller_name ? caller_name : sha1_to_hex(sha1));
163 name = get_rev_name(obj);
164 if (name)
165 printf("%s\n", name);
166 else if (allow_undefined)
167 printf("undefined\n");
168 else if (always)
169 printf("%s\n", find_unique_abbrev(sha1, DEFAULT_ABBREV));
170 else
171 die("cannot describe '%s'", sha1_to_hex(sha1));
172}
173
edefb1a2 174static char const * const name_rev_usage[] = {
1b1dd23f 175 "git name-rev [options] ( --all | --stdin | <commit>... )",
edefb1a2
PH
176 NULL
177};
178
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179static void name_rev_line(char *p, struct name_ref_data *data)
180{
181 int forty = 0;
182 char *p_start;
183 for (p_start = p; *p; p++) {
184#define ishex(x) (isdigit((x)) || ((x) >= 'a' && (x) <= 'f'))
185 if (!ishex(*p))
186 forty = 0;
187 else if (++forty == 40 &&
188 !ishex(*(p+1))) {
189 unsigned char sha1[40];
190 const char *name = NULL;
191 char c = *(p+1);
7c5b1675 192 int p_len = p - p_start + 1;
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193
194 forty = 0;
195
196 *(p+1) = 0;
197 if (!get_sha1(p - 39, sha1)) {
198 struct object *o =
199 lookup_object(sha1);
200 if (o)
201 name = get_rev_name(o);
202 }
203 *(p+1) = c;
204
205 if (!name)
206 continue;
207
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208 if (data->name_only)
209 printf("%.*s%s", p_len - 40, p_start, name);
210 else
211 printf("%.*s (%s)", p_len, p_start, name);
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212 p_start = p + 1;
213 }
214 }
215
216 /* flush */
217 if (p_start != p)
218 fwrite(p_start, p - p_start, 1, stdout);
219}
220
d6b64ed0 221int cmd_name_rev(int argc, const char **argv, const char *prefix)
bd321bcc 222{
3cd47459 223 struct object_array revs = OBJECT_ARRAY_INIT;
da2478db 224 int all = 0, transform_stdin = 0, allow_undefined = 1, always = 0;
23615708 225 struct name_ref_data data = { 0, 0, NULL };
edefb1a2
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226 struct option opts[] = {
227 OPT_BOOLEAN(0, "name-only", &data.name_only, "print only names (no SHA-1)"),
228 OPT_BOOLEAN(0, "tags", &data.tags_only, "only use tags to name the commits"),
229 OPT_STRING(0, "refs", &data.ref_filter, "pattern",
230 "only use refs matching <pattern>"),
231 OPT_GROUP(""),
232 OPT_BOOLEAN(0, "all", &all, "list all commits reachable from all refs"),
233 OPT_BOOLEAN(0, "stdin", &transform_stdin, "read from stdin"),
a2cf9f44 234 OPT_BOOLEAN(0, "undefined", &allow_undefined, "allow to print `undefined` names"),
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235 OPT_BOOLEAN(0, "always", &always,
236 "show abbreviated commit object as fallback"),
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237 OPT_END(),
238 };
bd321bcc 239
ef90d6d4 240 git_config(git_default_config, NULL);
37782920 241 argc = parse_options(argc, argv, prefix, opts, name_rev_usage, 0);
edefb1a2
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242 if (!!all + !!transform_stdin + !!argc > 1) {
243 error("Specify either a list, or --all, not both!");
244 usage_with_options(name_rev_usage, opts);
245 }
246 if (all || transform_stdin)
247 cutoff = 0;
bd321bcc 248
edefb1a2 249 for (; argc; argc--, argv++) {
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250 unsigned char sha1[20];
251 struct object *o;
252 struct commit *commit;
253
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254 if (get_sha1(*argv, sha1)) {
255 fprintf(stderr, "Could not get sha1 for %s. Skipping.\n",
256 *argv);
257 continue;
258 }
259
9534f40b 260 o = deref_tag(parse_object(sha1), *argv, 0);
1974632c 261 if (!o || o->type != OBJ_COMMIT) {
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262 fprintf(stderr, "Could not get commit for %s. Skipping.\n",
263 *argv);
264 continue;
265 }
266
267 commit = (struct commit *)o;
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268 if (cutoff > commit->date)
269 cutoff = commit->date;
1f1e895f 270 add_object_array((struct object *)commit, *argv, &revs);
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271 }
272
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273 if (cutoff)
274 cutoff = cutoff - CUTOFF_DATE_SLOP;
2afc29aa 275 for_each_ref(name_ref, &data);
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276
277 if (transform_stdin) {
278 char buffer[2048];
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279
280 while (!feof(stdin)) {
e8b55fab 281 char *p = fgets(buffer, sizeof(buffer), stdin);
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282 if (!p)
283 break;
e8b55fab 284 name_rev_line(p, &data);
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285 }
286 } else if (all) {
fc046a75 287 int i, max;
bd321bcc 288
fc046a75 289 max = get_max_object_index();
a83123de
BS
290 for (i = 0; i < max; i++) {
291 struct object *obj = get_indexed_object(i);
292 if (!obj)
293 continue;
294 show_name(obj, NULL,
da2478db 295 always, allow_undefined, data.name_only);
a83123de 296 }
1f1e895f
LT
297 } else {
298 int i;
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JH
299 for (i = 0; i < revs.nr; i++)
300 show_name(revs.objects[i].item, revs.objects[i].name,
301 always, allow_undefined, data.name_only);
1f1e895f 302 }
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303
304 return 0;
305}