name-rev.c

   1 #include <stdlib.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                         char *new_name = xmalloc(strlen(tip_name)+8);
  61
  62                         if (generation > 0)
  63                                 sprintf(new_name, "%s~%d^%d", tip_name,
  64                                                 generation, parent_number);
  65                         else
  66                                 sprintf(new_name, "%s^%d", tip_name, parent_number);
  67
  68                         name_rev(parents->item, new_name,
  69                                 merge_traversals + 1 , 0, 0);
  70                 } else {
  71                         name_rev(parents->item, tip_name, merge_traversals,
  72                                 generation + 1, 0);
  73                 }
  74         }
  75 }
  76
  77 static int tags_only = 0;
  78
  79 static int name_ref(const char *path, const unsigned char *sha1)
  80 {
  81         struct object *o = parse_object(sha1);
  82         int deref = 0;
  83
  84         if (tags_only && strncmp(path, "refs/tags/", 10))
  85                 return 0;
  86
  87         while (o && o->type == TYPE_TAG) {
  88                 struct tag *t = (struct tag *) o;
  89                 if (!t->tagged)
  90                         break; /* broken repository */
  91                 o = parse_object(t->tagged->sha1);
  92                 deref = 1;
  93         }
  94         if (o && o->type == TYPE_COMMIT) {
  95                 struct commit *commit = (struct commit *)o;
  96
  97                 if (!strncmp(path, "refs/heads/", 11))
  98                         path = path + 11;
  99                 else if (!strncmp(path, "refs/", 5))
 100                         path = path + 5;
 101
 102                 name_rev(commit, strdup(path), 0, 0, deref);
 103         }
 104         return 0;
 105 }
 106
 107 /* returns a static buffer */
 108 static const char* get_rev_name(struct object *o)
 109 {
 110         static char buffer[1024];
 111         struct rev_name *n;
 112         struct commit *c;
 113
 114         if (o->type != TYPE_COMMIT)
 115                 return "undefined";
 116         c = (struct commit *) o;
 117         n = c->util;
 118         if (!n)
 119                 return "undefined";
 120
 121         if (!n->generation)
 122                 return n->tip_name;
 123
 124         snprintf(buffer, sizeof(buffer), "%s~%d", n->tip_name, n->generation);
 125
 126         return buffer;
 127 }
 128
 129 int main(int argc, char **argv)
 130 {
 131         struct object_array revs = { 0, 0, NULL };
 132         int as_is = 0, all = 0, transform_stdin = 0;
 133
 134         setup_git_directory();
 135         git_config(git_default_config);
 136
 137         if (argc < 2)
 138                 usage(name_rev_usage);
 139
 140         for (--argc, ++argv; argc; --argc, ++argv) {
 141                 unsigned char sha1[20];
 142                 struct object *o;
 143                 struct commit *commit;
 144
 145                 if (!as_is && (*argv)[0] == '-') {
 146                         if (!strcmp(*argv, "--")) {
 147                                 as_is = 1;
 148                                 continue;
 149                         } else if (!strcmp(*argv, "--tags")) {
 150                                 tags_only = 1;
 151                                 continue;
 152                         } else if (!strcmp(*argv, "--all")) {
 153                                 if (argc > 1)
 154                                         die("Specify either a list, or --all, not both!");
 155                                 all = 1;
 156                                 cutoff = 0;
 157                                 continue;
 158                         } else if (!strcmp(*argv, "--stdin")) {
 159                                 if (argc > 1)
 160                                         die("Specify either a list, or --stdin, not both!");
 161                                 transform_stdin = 1;
 162                                 cutoff = 0;
 163                                 continue;
 164                         }
 165                         usage(name_rev_usage);
 166                 }
 167
 168                 if (get_sha1(*argv, sha1)) {
 169                         fprintf(stderr, "Could not get sha1 for %s. Skipping.\n",
 170                                         *argv);
 171                         continue;
 172                 }
 173
 174                 o = deref_tag(parse_object(sha1), *argv, 0);
 175                 if (!o || o->type != TYPE_COMMIT) {
 176                         fprintf(stderr, "Could not get commit for %s. Skipping.\n",
 177                                         *argv);
 178                         continue;
 179                 }
 180
 181                 commit = (struct commit *)o;
 182
 183                 if (cutoff > commit->date)
 184                         cutoff = commit->date;
 185
 186                 add_object_array((struct object *)commit, *argv, &revs);
 187         }
 188
 189         for_each_ref(name_ref);
 190
 191         if (transform_stdin) {
 192                 char buffer[2048];
 193                 char *p, *p_start;
 194
 195                 while (!feof(stdin)) {
 196                         int forty = 0;
 197                         p = fgets(buffer, sizeof(buffer), stdin);
 198                         if (!p)
 199                                 break;
 200
 201                         for (p_start = p; *p; p++) {
 202 #define ishex(x) (isdigit((x)) || ((x) >= 'a' && (x) <= 'f'))
 203                                 if (!ishex(*p))
 204                                         forty = 0;
 205                                 else if (++forty == 40 &&
 206                                                 !ishex(*(p+1))) {
 207                                         unsigned char sha1[40];
 208                                         const char *name = "undefined";
 209                                         char c = *(p+1);
 210
 211                                         forty = 0;
 212
 213                                         *(p+1) = 0;
 214                                         if (!get_sha1(p - 39, sha1)) {
 215                                                 struct object *o =
 216                                                         lookup_object(sha1);
 217                                                 if (o)
 218                                                         name = get_rev_name(o);
 219                                         }
 220                                         *(p+1) = c;
 221
 222                                         if (!strcmp(name, "undefined"))
 223                                                 continue;
 224
 225                                         fwrite(p_start, p - p_start + 1, 1,
 226                                                stdout);
 227                                         printf(" (%s)", name);
 228                                         p_start = p + 1;
 229                                 }
 230                         }
 231
 232                         /* flush */
 233                         if (p_start != p)
 234                                 fwrite(p_start, p - p_start, 1, stdout);
 235                 }
 236         } else if (all) {
 237                 int i, max;
 238
 239                 max = get_max_object_index();
 240                 for (i = 0; i < max; i++) {
 241                         struct object * obj = get_indexed_object(i);
 242                         if (!obj)
 243                                 continue;
 244                         printf("%s %s\n", sha1_to_hex(obj->sha1), get_rev_name(obj));
 245                 }
 246         } else {
 247                 int i;
 248                 for (i = 0; i < revs.nr; i++)
 249                         printf("%s %s\n",
 250                                 revs.objects[i].name,
 251                                 get_rev_name(revs.objects[i].item));
 252         }
 253
 254         return 0;
 255 }
 256