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