1 files changed, 6 insertions, 4 deletions

diff --git a/main.go b/main.go
index 28c2d0d..db41eab 100644
--- a/main.go
+++ b/main.go
@@ -46,13 +46,15 @@ func main() {
 		log.Fatalf("Invalid -depth argument: %d", *maxDepth)
 	}
 
-	shortcodePresent := hamlet.New(*shortcode)
-	urlArgPresent := hamlet.New(*urlArg)
-	if hamlet.Iff(urlArgPresent, shortcodePresent).Assert() {
+	// Use hamlet to vet the validity of the given command-line
+	// argument configuration provided by the user.
+	shortcodePresent := hamlet.Present(*shortcode)
+	urlArgPresent := hamlet.Present(*urlArg)
+	if hamlet.Xor(urlArgPresent, shortcodePresent).Deny() {
 		log.Fatal("Need exactly one of -url or -shortcode")
 	}
 
-	if !hamlet.If(hamlet.New(*shortcodeFilename), shortcodePresent).Assert() {
+	if hamlet.If(hamlet.Present(*shortcodeFilename), shortcodePresent).Deny() {
 		log.Fatal("-scfile implies use of -shortcode")
 	}