Clean up builtin-update-ref's option parsing

builtin-update-ref's option parsing was somewhat tricky to follow,
especially if the -d option was given. This patch cleans it upp a bit,
at the expense of making it a bit longer.

Signed-off-by: Karl Hasselström <kha@treskal.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/builtin-update-ref.c b/builtin-update-ref.c
index 93c127196d272d99d8af24a5fbc7ac89efdbb3d4..1e714a3c93416a081cb8d83c7a3d33b7dd265c88 100644 (file)
--- a/builtin-update-ref.c
+++ b/builtin-update-ref.c
@@ -11,7 +11,7 @@ static const char * const git_update_ref_usage[] = {
 
 int cmd_update_ref(int argc, const char **argv, const char *prefix)
 {
-       const char *refname, *value, *oldval, *msg=NULL;
+       const char *refname, *oldval, *msg=NULL;
        unsigned char sha1[20], oldsha1[20];
        int delete = 0, no_deref = 0;
        struct option options[] = {
@@ -27,25 +27,29 @@ int cmd_update_ref(int argc, const char **argv, const char *prefix)
        if (msg && !*msg)
                die("Refusing to perform update with empty message.");
 
-       if (argc < 2 || argc > 3)
-               usage_with_options(git_update_ref_usage, options);
-       refname = argv[0];
-       value   = argv[1];
-       oldval  = argv[2];
-
-       if (get_sha1(value, sha1))
-               die("%s: not a valid SHA1", value);
-
        if (delete) {
-               if (oldval)
+               if (argc != 2)
+                       usage_with_options(git_update_ref_usage, options);
+               refname = argv[0];
+               oldval = argv[1];
+       } else {
+               const char *value;
+               if (argc < 2 || argc > 3)
                        usage_with_options(git_update_ref_usage, options);
-               return delete_ref(refname, sha1);
+               refname = argv[0];
+               value = argv[1];
+               oldval = argv[2];
+               if (get_sha1(value, sha1))
+                       die("%s: not a valid SHA1", value);
        }
 
-       hashclr(oldsha1);
+       hashclr(oldsha1); /* all-zero hash in case oldval is the empty string */
        if (oldval && *oldval && get_sha1(oldval, oldsha1))
                die("%s: not a valid old SHA1", oldval);
 
-       return update_ref(msg, refname, sha1, oldval ? oldsha1 : NULL,
-                         no_deref ? REF_NODEREF : 0, DIE_ON_ERR);
+       if (delete)
+               return delete_ref(refname, oldsha1);
+       else
+               return update_ref(msg, refname, sha1, oldval ? oldsha1 : NULL,
+                                 no_deref ? REF_NODEREF : 0, DIE_ON_ERR);
 }