describe: when failing, tell the user about options that work

diff --git a/builtin-merge-base.c b/builtin-merge-base.c
index 03fc1c211453f1ed09ee2c6b71d438b0bfbf474f..54e7ec22370ce63150ddc93ebe252bea09f5064a 100644 (file)
--- a/builtin-merge-base.c
+++ b/builtin-merge-base.c
@@ -23,7 +23,7 @@ static int show_merge_base(struct commit **rev, int rev_nr, int show_all)
 }
 
 static const char * const merge_base_usage[] = {
-       "git merge-base [--all] <commit-id> <commit-id>...",
+       "git merge-base [-a|--all] <commit> <commit>...",
        NULL
 };
 
@@ -53,7 +53,7 @@ int cmd_merge_base(int argc, const char **argv, const char *prefix)
        };
 
        git_config(git_default_config, NULL);
-       argc = parse_options(argc, argv, options, merge_base_usage, 0);
+       argc = parse_options(argc, argv, prefix, options, merge_base_usage, 0);
        if (argc < 2)
                usage_with_options(merge_base_usage, options);
        rev = xmalloc(argc * sizeof(*rev));