git/builtin-merge-base.c

   1 #include "builtin.h"
   2 #include "cache.h"
   3 #include "commit.h"
   4
   5 static int show_merge_base(struct commit *rev1, struct commit *rev2, int show_all)
   6 {
   7         struct commit_list *result = get_merge_bases(rev1, rev2, 0);
   8
   9         if (!result)
  10                 return 1;
  11
  12         while (result) {
  13                 printf("%s\n", sha1_to_hex(result->item->object.sha1));
  14                 if (!show_all)
  15                         return 0;
  16                 result = result->next;
  17         }
  18
  19         return 0;
  20 }
  21
  22 static const char merge_base_usage[] =
  23 "git-merge-base [--all] <commit-id> <commit-id>";
  24
  25 int cmd_merge_base(int argc, const char **argv, const char *prefix)
  26 {
  27         struct commit *rev1, *rev2;
  28         unsigned char rev1key[20], rev2key[20];
  29         int show_all = 0;
  30
  31         git_config(git_default_config);
  32
  33         while (1 < argc && argv[1][0] == '-') {
  34                 const char *arg = argv[1];
  35                 if (!strcmp(arg, "-a") || !strcmp(arg, "--all"))
  36                         show_all = 1;
  37                 else
  38                         usage(merge_base_usage);
  39                 argc--; argv++;
  40         }
  41         if (argc != 3)
  42                 usage(merge_base_usage);
  43         if (get_sha1(argv[1], rev1key))
  44                 die("Not a valid object name %s", argv[1]);
  45         if (get_sha1(argv[2], rev2key))
  46                 die("Not a valid object name %s", argv[2]);
  47         rev1 = lookup_commit_reference(rev1key);
  48         rev2 = lookup_commit_reference(rev2key);
  49         if (!rev1 || !rev2)
  50                 return 1;
  51         return show_merge_base(rev1, rev2, show_all);
  52 }