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