[PATCH v3 1/2] reset: enable '-' short-hand for previous branch

[Sudhanshu Shekhar <sudshekhar02@gmail.com>]

'git reset -' will reset to the previous branch. It will behave similar
to @{-1} except when a file named '@{-1}' is present. To refer to a file
named '-', use ./- or the -- flag.

Helped-by: Junio C Hamano <gitster@pobox.com>
Helped-by: Eric Sunshine <sunshine@sunshineco.com>
Helped-by: Matthieu Moy <Matthieu.Moy@grenoble-inp.fr>
Signed-off-by: Sudhanshu Shekhar <sudshekhar02@gmail.com>
---
Thank you all for your feedback. I have made changes and I hope this patch meets community standards. Please let me know if any further changes are required.

Regards,
Sudhanshu

 builtin/reset.c | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/builtin/reset.c b/builtin/reset.c
index 4c08ddc..8abd300 100644
--- a/builtin/reset.c
+++ b/builtin/reset.c
@@ -192,6 +192,7 @@ static void parse_args(struct pathspec *pathspec,
 {
 	const char *rev = "HEAD";
 	unsigned char unused[20];
+	int substituted_minus = 0;
 	/*
 	 * Possible arguments are:
 	 *
@@ -205,6 +206,10 @@ static void parse_args(struct pathspec *pathspec,
 	 */
 
 	if (argv[0]) {
+		if (!strcmp(argv[0], "-")) {
+			argv[0] = "@{-1}";
+			substituted_minus = 1;
+		}
 		if (!strcmp(argv[0], "--")) {
 			argv++; /* reset to HEAD, possibly with paths */
 		} else if (argv[1] && !strcmp(argv[1], "--")) {
@@ -222,15 +227,21 @@ static void parse_args(struct pathspec *pathspec,
 			 * Ok, argv[0] looks like a commit/tree; it should not
 			 * be a filename.
 			 */
+			if (substituted_minus)
+				argv[0] = "-";
 			verify_non_filename(prefix, argv[0]);
+			if (substituted_minus)
+				argv[0] = "@{-1}";
 			rev = *argv++;
 		} else {
+			/* We were treating "-" as a commit and not a file */
+			if (substituted_minus)
+				argv[0] = "-";
 			/* Otherwise we treat this as a filename */
 			verify_filename(prefix, argv[0], 1);
 		}
 	}
 	*rev_ret = rev;
-
 	if (read_cache() < 0)
 		die(_("index file corrupt"));
 
-- 
2.3.1.279.gd534259