default cam + unsupported wayland

scan.sh

@@ -3,7 +3,13 @@
 # Debian: sudo apt-get install zbar-tools xdotool mpv
 # Arch: sudo pacman -S zbar xdotool mpv
 
-zbarcam /dev/video0 | while read line; do
+if [[ $XDG_SESSION_TYPE != "x11" ]]; then
+	echo "Unsupported session type: $XDG_SESSION_TYPE"
+	exit 1
+fi
+
+
+zbarcam $1 | while read line; do
     if [[ $line == *:* ]]; then
         code="${line#*:}"
         echo "$code"