checkout: implement "-" abbreviation, add docs and tests

diff --git a/builtin-checkout.c b/builtin-checkout.c
index dc1de06279e2fcdb945e3ec5bdcd0a6f7d06e51b..b0a101bac7432719d62c013d98bb0e6171e45406 100644 (file)
--- a/builtin-checkout.c
+++ b/builtin-checkout.c
@@ -679,6 +679,9 @@ int cmd_checkout(int argc, const char **argv, const char *prefix)
                arg = argv[0];
                has_dash_dash = (argc > 1) && !strcmp(argv[1], "--");
 
+               if (!strcmp(arg, "-"))
+                       arg = "@{-1}";
+
                if (get_sha1(arg, rev)) {
                        if (has_dash_dash)          /* case (1) */
                                die("invalid reference: %s", arg);