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 | commitish [commitish...] )\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->object.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->object.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 == tag_type) {
  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 == commit_type) {
  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 = (struct rev_name *)o->util;
 112         if (!n)
 113                 return "undefined";
 114
 115         if (!n->generation)
 116                 return n->tip_name;
 117
 118         snprintf(buffer, sizeof(buffer), "%s~%d", n->tip_name, n->generation);
 119
 120         return buffer;
 121 }
 122
 123 int main(int argc, char **argv)
 124 {
 125         struct object_list *revs = NULL;
 126         struct object_list **walker = &revs;
 127         int as_is = 0, all = 0, transform_stdin = 0;
 128
 129         setup_git_directory();
 130
 131         if (argc < 2)
 132                 usage(name_rev_usage);
 133
 134         for (--argc, ++argv; argc; --argc, ++argv) {
 135                 unsigned char sha1[20];
 136                 struct object *o;
 137                 struct commit *commit;
 138
 139                 if (!as_is && (*argv)[0] == '-') {
 140                         if (!strcmp(*argv, "--")) {
 141                                 as_is = 1;
 142                                 continue;
 143                         } else if (!strcmp(*argv, "--tags")) {
 144                                 tags_only = 1;
 145                                 continue;
 146                         } else if (!strcmp(*argv, "--all")) {
 147                                 if (argc > 1)
 148                                         die("Specify either a list, or --all, not both!");
 149                                 all = 1;
 150                                 cutoff = 0;
 151                                 continue;
 152                         } else if (!strcmp(*argv, "--stdin")) {
 153                                 if (argc > 1)
 154                                         die("Specify either a list, or --stdin, not both!");
 155                                 transform_stdin = 1;
 156                                 cutoff = 0;
 157                                 continue;
 158                         }
 159                         usage(name_rev_usage);
 160                 }
 161
 162                 if (get_sha1(*argv, sha1)) {
 163                         fprintf(stderr, "Could not get sha1 for %s. Skipping.\n",
 164                                         *argv);
 165                         continue;
 166                 }
 167
 168                 o = deref_tag(parse_object(sha1), *argv, 0);
 169                 if (!o || o->type != commit_type) {
 170                         fprintf(stderr, "Could not get commit for %s. Skipping.\n",
 171                                         *argv);
 172                         continue;
 173                 }
 174
 175                 commit = (struct commit *)o;
 176
 177                 if (cutoff > commit->date)
 178                         cutoff = commit->date;
 179
 180                 object_list_append((struct object *)commit, walker);
 181                 (*walker)->name = *argv;
 182                 walker = &((*walker)->next);
 183         }
 184
 185         for_each_ref(name_ref);
 186
 187         if (transform_stdin) {
 188                 char buffer[2048];
 189                 char *p, *p_start;
 190
 191                 while (!feof(stdin)) {
 192                         int forty = 0;
 193                         p = fgets(buffer, sizeof(buffer), stdin);
 194                         if (!p)
 195                                 break;
 196
 197                         for (p_start = p; *p; p++) {
 198 #define ishex(x) (isdigit((x)) || ((x) >= 'a' && (x) <= 'f'))
 199                                 if (!ishex(*p))
 200                                         forty = 0;
 201                                 else if (++forty == 40 &&
 202                                                 !ishex(*(p+1))) {
 203                                         unsigned char sha1[40];
 204                                         const char *name = "undefined";
 205                                         char c = *(p+1);
 206
 207                                         forty = 0;
 208
 209                                         *(p+1) = 0;
 210                                         if (!get_sha1(p - 39, sha1)) {
 211                                                 struct object *o =
 212                                                         lookup_object(sha1);
 213                                                 if (o)
 214                                                         name = get_rev_name(o);
 215                                         }
 216                                         *(p+1) = c;
 217
 218                                         if (!strcmp(name, "undefined"))
 219                                                 continue;
 220
 221                                         fwrite(p_start, p - p_start + 1, 1,
 222                                                stdout);
 223                                         printf(" (%s)", name);
 224                                         p_start = p + 1;
 225                                 }
 226                         }
 227
 228                         /* flush */
 229                         if (p_start != p)
 230                                 fwrite(p_start, p - p_start, 1, stdout);
 231                 }
 232         } else if (all) {
 233                 int i;
 234
 235                 for (i = 0; i < nr_objs; i++)
 236                         printf("%s %s\n", sha1_to_hex(objs[i]->sha1),
 237                                         get_rev_name(objs[i]));
 238         } else
 239                 for ( ; revs; revs = revs->next)
 240                         printf("%s %s\n", revs->name, get_rev_name(revs->item));
 241
 242         return 0;
 243 }
 244