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#include "builtin.h"
#include "cache.h"
#include "commit.h"

static int show_merge_base(struct commit *rev1, struct commit *rev2, int show_all)
{
struct commit_list *result = get_merge_bases(rev1, rev2, 0);

if (!result)
return 1;

while (result) {
printf("%s\n", sha1_to_hex(result->item->object.sha1));
if (!show_all)
return 0;
result = result->next;
}

return 0;
}

static const char merge_base_usage[] =
"git-merge-base [--all] <commit-id> <commit-id>";

int cmd_merge_base(int argc, const char **argv, const char *prefix)
{
struct commit *rev1, *rev2;
unsigned char rev1key[20], rev2key[20];
int show_all = 0;

git_config(git_default_config);

while (1 < argc && argv[1][0] == '-') {
const char *arg = argv[1];
if (!strcmp(arg, "-a") || !strcmp(arg, "--all"))
show_all = 1;
else
usage(merge_base_usage);
argc--; argv++;
}
if (argc != 3)
usage(merge_base_usage);
if (get_sha1(argv[1], rev1key))
die("Not a valid object name %s", argv[1]);
if (get_sha1(argv[2], rev2key))
die("Not a valid object name %s", argv[2]);
rev1 = lookup_commit_reference(rev1key);
rev2 = lookup_commit_reference(rev2key);
if (!rev1 || !rev2)
return 1;
return show_merge_base(rev1, rev2, show_all);
}
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