[PATCH] branch.c: Allow "-" as a short-hand for "@{-1}" in "git branch -d @{-1}"

[Dinesh Polathula <dpdineshp2@gmail.com>]

From: Dinesh <dpdineshp2@gmail.com>

The "-" shorthand can be used as a replacement for "@{-1}" to refer 
to the previous branch the user was on in the "git branch -d @{-1}" 
command.Replace "-" argument with "@{-1}" when the command line 
arguments are parsed.

Signed-off-by: Dinesh <dpdineshp2@gmail.com>
---
 builtin/branch.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/builtin/branch.c b/builtin/branch.c
index 7b45b6b..98d2c4b 100644
--- a/builtin/branch.c
+++ b/builtin/branch.c
@@ -24,7 +24,7 @@
 static const char * const builtin_branch_usage[] = {
 	N_("git branch [<options>] [-r | -a] [--merged | --no-merged]"),
 	N_("git branch [<options>] [-l] [-f] <branch-name> [<start-point>]"),
-	N_("git branch [<options>] [-r] (-d | -D) <branch-name>..."),
+	N_("git branch [<options>] [-r] (-d | -D) [-] <branch-name>..."),
 	N_("git branch [<options>] (-m | -M) [<old-branch>] <new-branch>"),
 	N_("git branch [<options>] [-r | -a] [--points-at]"),
 	NULL
@@ -658,8 +658,13 @@ int cmd_branch(int argc, const char **argv, const char *prefix)
 	filter.abbrev = -1;
 
 	if (argc == 2 && !strcmp(argv[1], "-h"))
-		usage_with_options(builtin_branch_usage, options);
-
+	{
+		usage_with_options(builtin_branch_usage, options);	
+	}
+	if (argc == 3 && !strcmp(argv[2], "-"))
+	{
+	    argv[2] = "@{-1}";	
+	}
 	git_config(git_branch_config, NULL);
 
 	track = git_branch_track;
-- 
2.8.0.rc0