merge-base.c

   1 #include <stdlib.h>
   2 #include "cache.h"
   3 #include "commit.h"
   4
   5 static int show_all = 0;
   6
   7 static int merge_base(struct commit *rev1, struct commit *rev2)
   8 {
   9         struct commit_list *result = get_merge_bases(rev1, rev2);
  10
  11         if (!result)
  12                 return 1;
  13
  14         while (result) {
  15                 printf("%s\n", sha1_to_hex(result->item->object.sha1));
  16                 if (!show_all)
  17                         return 0;
  18                 result = result->next;
  19         }
  20
  21         return 0;
  22 }
  23
  24 static const char merge_base_usage[] =
  25 "git-merge-base [--all] <commit-id> <commit-id>";
  26
  27 int main(int argc, char **argv)
  28 {
  29         struct commit *rev1, *rev2;
  30         unsigned char rev1key[20], rev2key[20];
  31
  32         setup_git_directory();
  33         git_config(git_default_config);
  34
  35         while (1 < argc && argv[1][0] == '-') {
  36                 char *arg = argv[1];
  37                 if (!strcmp(arg, "-a") || !strcmp(arg, "--all"))
  38                         show_all = 1;
  39                 else
  40                         usage(merge_base_usage);
  41                 argc--; argv++;
  42         }
  43         if (argc != 3)
  44                 usage(merge_base_usage);
  45         if (get_sha1(argv[1], rev1key))
  46                 die("Not a valid object name %s", argv[1]);
  47         if (get_sha1(argv[2], rev2key))
  48                 die("Not a valid object name %s", argv[2]);
  49         rev1 = lookup_commit_reference(rev1key);
  50         rev2 = lookup_commit_reference(rev2key);
  51         if (!rev1 || !rev2)
  52                 return 1;
  53         return merge_base(rev1, rev2);
  54 }