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