builtin-name-rev.c

   1 #include "builtin.h"
   2 #include "cache.h"
   3 #include "commit.h"
   4 #include "tag.h"
   5 #include "refs.h"
   6
   7 static const char name_rev_usage[] =
   8         "git-name-rev [--tags] ( --all | --stdin | committish [committish...] )\n";
   9
  10 typedef struct rev_name {
  11         const char *tip_name;
  12         int merge_traversals;
  13         int generation;
  14 } rev_name;
  15
  16 static long cutoff = LONG_MAX;
  17
  18 static void name_rev(struct commit *commit,
  19                 const char *tip_name, int merge_traversals, int generation,
  20                 int deref)
  21 {
  22         struct rev_name *name = (struct rev_name *)commit->util;
  23         struct commit_list *parents;
  24         int parent_number = 1;
  25
  26         if (!commit->object.parsed)
  27                 parse_commit(commit);
  28
  29         if (commit->date < cutoff)
  30                 return;
  31
  32         if (deref) {
  33                 char *new_name = xmalloc(strlen(tip_name)+3);
  34                 strcpy(new_name, tip_name);
  35                 strcat(new_name, "^0");
  36                 tip_name = new_name;
  37
  38                 if (generation)
  39                         die("generation: %d, but deref?", generation);
  40         }
  41
  42         if (name == NULL) {
  43                 name = xmalloc(sizeof(rev_name));
  44                 commit->util = name;
  45                 goto copy_data;
  46         } else if (name->merge_traversals > merge_traversals ||
  47                         (name->merge_traversals == merge_traversals &&
  48                          name->generation > generation)) {
  49 copy_data:
  50                 name->tip_name = tip_name;
  51                 name->merge_traversals = merge_traversals;
  52                 name->generation = generation;
  53         } else
  54                 return;
  55
  56         for (parents = commit->parents;
  57                         parents;
  58                         parents = parents->next, parent_number++) {
  59                 if (parent_number > 1) {
  60                         int len = strlen(tip_name);
  61                         char *new_name = xmalloc(len + 8);
  62
  63                         if (len > 2 && !strcmp(tip_name + len - 2, "^0"))
  64                                 len -= 2;
  65                         if (generation > 0)
  66                                 sprintf(new_name, "%.*s~%d^%d", len, tip_name,
  67                                                 generation, parent_number);
  68                         else
  69                                 sprintf(new_name, "%.*s^%d", len, tip_name,
  70                                                 parent_number);
  71
  72                         name_rev(parents->item, new_name,
  73                                 merge_traversals + 1 , 0, 0);
  74                 } else {
  75                         name_rev(parents->item, tip_name, merge_traversals,
  76                                 generation + 1, 0);
  77                 }
  78         }
  79 }
  80
  81 static int name_ref(const char *path, const unsigned char *sha1, int flags, void *cb_data)
  82 {
  83         struct object *o = parse_object(sha1);
  84         int tags_only = *(int*)cb_data;
  85         int deref = 0;
  86
  87         if (tags_only && strncmp(path, "refs/tags/", 10))
  88                 return 0;
  89
  90         while (o && o->type == OBJ_TAG) {
  91                 struct tag *t = (struct tag *) o;
  92                 if (!t->tagged)
  93                         break; /* broken repository */
  94                 o = parse_object(t->tagged->sha1);
  95                 deref = 1;
  96         }
  97         if (o && o->type == OBJ_COMMIT) {
  98                 struct commit *commit = (struct commit *)o;
  99
 100                 if (!strncmp(path, "refs/heads/", 11))
 101                         path = path + 11;
 102                 else if (!strncmp(path, "refs/", 5))
 103                         path = path + 5;
 104
 105                 name_rev(commit, xstrdup(path), 0, 0, deref);
 106         }
 107         return 0;
 108 }
 109
 110 /* returns a static buffer */
 111 static const char* get_rev_name(struct object *o)
 112 {
 113         static char buffer[1024];
 114         struct rev_name *n;
 115         struct commit *c;
 116
 117         if (o->type != OBJ_COMMIT)
 118                 return "undefined";
 119         c = (struct commit *) o;
 120         n = c->util;
 121         if (!n)
 122                 return "undefined";
 123
 124         if (!n->generation)
 125                 return n->tip_name;
 126         else {
 127                 int len = strlen(n->tip_name);
 128                 if (len > 2 && !strcmp(n->tip_name + len - 2, "^0"))
 129                         len -= 2;
 130                 snprintf(buffer, sizeof(buffer), "%.*s~%d", len, n->tip_name,
 131                                 n->generation);
 132
 133                 return buffer;
 134         }
 135 }
 136
 137 int cmd_name_rev(int argc, const char **argv, const char *prefix)
 138 {
 139         struct object_array revs = { 0, 0, NULL };
 140         int as_is = 0, all = 0, transform_stdin = 0;
 141         int tags_only = 0;
 142
 143         git_config(git_default_config);
 144
 145         if (argc < 2)
 146                 usage(name_rev_usage);
 147
 148         for (--argc, ++argv; argc; --argc, ++argv) {
 149                 unsigned char sha1[20];
 150                 struct object *o;
 151                 struct commit *commit;
 152
 153                 if (!as_is && (*argv)[0] == '-') {
 154                         if (!strcmp(*argv, "--")) {
 155                                 as_is = 1;
 156                                 continue;
 157                         } else if (!strcmp(*argv, "--tags")) {
 158                                 tags_only = 1;
 159                                 continue;
 160                         } else if (!strcmp(*argv, "--all")) {
 161                                 if (argc > 1)
 162                                         die("Specify either a list, or --all, not both!");
 163                                 all = 1;
 164                                 cutoff = 0;
 165                                 continue;
 166                         } else if (!strcmp(*argv, "--stdin")) {
 167                                 if (argc > 1)
 168                                         die("Specify either a list, or --stdin, not both!");
 169                                 transform_stdin = 1;
 170                                 cutoff = 0;
 171                                 continue;
 172                         }
 173                         usage(name_rev_usage);
 174                 }
 175
 176                 if (get_sha1(*argv, sha1)) {
 177                         fprintf(stderr, "Could not get sha1 for %s. Skipping.\n",
 178                                         *argv);
 179                         continue;
 180                 }
 181
 182                 o = deref_tag(parse_object(sha1), *argv, 0);
 183                 if (!o || o->type != OBJ_COMMIT) {
 184                         fprintf(stderr, "Could not get commit for %s. Skipping.\n",
 185                                         *argv);
 186                         continue;
 187                 }
 188
 189                 commit = (struct commit *)o;
 190
 191                 if (cutoff > commit->date)
 192                         cutoff = commit->date;
 193
 194                 add_object_array((struct object *)commit, *argv, &revs);
 195         }
 196
 197         for_each_ref(name_ref, &tags_only);
 198
 199         if (transform_stdin) {
 200                 char buffer[2048];
 201                 char *p, *p_start;
 202
 203                 while (!feof(stdin)) {
 204                         int forty = 0;
 205                         p = fgets(buffer, sizeof(buffer), stdin);
 206                         if (!p)
 207                                 break;
 208
 209                         for (p_start = p; *p; p++) {
 210 #define ishex(x) (isdigit((x)) || ((x) >= 'a' && (x) <= 'f'))
 211                                 if (!ishex(*p))
 212                                         forty = 0;
 213                                 else if (++forty == 40 &&
 214                                                 !ishex(*(p+1))) {
 215                                         unsigned char sha1[40];
 216                                         const char *name = "undefined";
 217                                         char c = *(p+1);
 218
 219                                         forty = 0;
 220
 221                                         *(p+1) = 0;
 222                                         if (!get_sha1(p - 39, sha1)) {
 223                                                 struct object *o =
 224                                                         lookup_object(sha1);
 225                                                 if (o)
 226                                                         name = get_rev_name(o);
 227                                         }
 228                                         *(p+1) = c;
 229
 230                                         if (!strcmp(name, "undefined"))
 231                                                 continue;
 232
 233                                         fwrite(p_start, p - p_start + 1, 1,
 234                                                stdout);
 235                                         printf(" (%s)", name);
 236                                         p_start = p + 1;
 237                                 }
 238                         }
 239
 240                         /* flush */
 241                         if (p_start != p)
 242                                 fwrite(p_start, p - p_start, 1, stdout);
 243                 }
 244         } else if (all) {
 245                 int i, max;
 246
 247                 max = get_max_object_index();
 248                 for (i = 0; i < max; i++) {
 249                         struct object * obj = get_indexed_object(i);
 250                         if (!obj)
 251                                 continue;
 252                         printf("%s %s\n", sha1_to_hex(obj->sha1), get_rev_name(obj));
 253                 }
 254         } else {
 255                 int i;
 256                 for (i = 0; i < revs.nr; i++)
 257                         printf("%s %s\n",
 258                                 revs.objects[i].name,
 259                                 get_rev_name(revs.objects[i].item));
 260         }
 261
 262         return 0;
 263 }
 264