branch: factor out check_branch_commit()

Move the code to perform checks on the tip commit of a branch
to its own function.

Signed-off-by: Rene Scharfe <rene.scharfe@lsrfire.ath.cx>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin/branch.c

@@ -154,10 +154,28 @@ static int branch_merged(int kind, const char *name,
 	return merged;
 }
 
+static int check_branch_commit(const char *branchname, const char *refname,
+			       unsigned char *sha1, struct commit *head_rev,
+			       int kinds, int force)
+{
+	struct commit *rev = lookup_commit_reference(sha1);
+	if (!rev) {
+		error(_("Couldn't look up commit object for '%s'"), refname);
+		return -1;
+	}
+	if (!force && !branch_merged(kinds, branchname, rev, head_rev)) {
+		error(_("The branch '%s' is not fully merged.\n"
+		      "If you are sure you want to delete it, "
+		      "run 'git branch -D %s'."), branchname, branchname);
+		return -1;
+	}
+	return 0;
+}
+
 static int delete_branches(int argc, const char **argv, int force, int kinds,
 			   int quiet)
 {
-	struct commit *rev, *head_rev = NULL;
+	struct commit *head_rev = NULL;
 	unsigned char sha1[20];
 	char *name = NULL;
 	const char *fmt;
@@ -206,17 +224,8 @@ static int delete_branches(int argc, const char **argv, int force, int kinds,
 			continue;
 		}
 
-		rev = lookup_commit_reference(sha1);
-		if (!rev) {
-			error(_("Couldn't look up commit object for '%s'"), name);
-			ret = 1;
-			continue;
-		}
-
-		if (!force && !branch_merged(kinds, bname.buf, rev, head_rev)) {
-			error(_("The branch '%s' is not fully merged.\n"
-			      "If you are sure you want to delete it, "
-			      "run 'git branch -D %s'."), bname.buf, bname.buf);
+		if (check_branch_commit(bname.buf, name, sha1, head_rev, kinds,
+					force)) {
 			ret = 1;
 			continue;
 		}