Andrew's git - gitweb.git/blob - builtin-merge-base.c

   1#include "builtin.h"
   2#include "cache.h"
   3#include "commit.h"
   4#include "parse-options.h"
   5
   6static int show_merge_base(struct commit **rev, int rev_nr, int show_all)
   7{
   8        struct commit_list *result;
   9
  10        result = get_merge_bases_many(rev[0], rev_nr - 1, rev + 1, 0);
  11
  12        if (!result)
  13                return 1;
  14
  15        while (result) {
  16                printf("%s\n", sha1_to_hex(result->item->object.sha1));
  17                if (!show_all)
  18                        return 0;
  19                result = result->next;
  20        }
  21
  22        return 0;
  23}
  24
  25static const char * const merge_base_usage[] = {
  26        "git merge-base [-a|--all] <commit> <commit>...",
  27        NULL
  28};
  29
  30static struct commit *get_commit_reference(const char *arg)
  31{
  32        unsigned char revkey[20];
  33        struct commit *r;
  34
  35        if (get_sha1(arg, revkey))
  36                die("Not a valid object name %s", arg);
  37        r = lookup_commit_reference(revkey);
  38        if (!r)
  39                die("Not a valid commit name %s", arg);
  40
  41        return r;
  42}
  43
  44int cmd_merge_base(int argc, const char **argv, const char *prefix)
  45{
  46        struct commit **rev;
  47        int rev_nr = 0;
  48        int show_all = 0;
  49
  50        struct option options[] = {
  51                OPT_BOOLEAN('a', "all", &show_all, "outputs all common ancestors"),
  52                OPT_END()
  53        };
  54
  55        git_config(git_default_config, NULL);
  56        argc = parse_options(argc, argv, prefix, options, merge_base_usage, 0);
  57        if (argc < 2)
  58                usage_with_options(merge_base_usage, options);
  59        rev = xmalloc(argc * sizeof(*rev));
  60        while (argc-- > 0)
  61                rev[rev_nr++] = get_commit_reference(*argv++);
  62        return show_merge_base(rev, rev_nr, show_all);
  63}