use nested if statements to enable displaymanager

aif

@@ -2181,49 +2181,49 @@ install_manjaro_de_wm() {
         target_desktop="/tmp/profiles/manjaro/xfce/Packages-Desktop"
         overlay="/tmp/profiles/manjaro/xfce/desktop-overlay/"
         profile="/tmp/profiles/manjaro/xfce/profile.conf"
-        display-manager="lightdm"
+        echo "lightdm" > /tmp/.display-manager
         ;;
       kde)
         target_desktop="/tmp/profiles/manjaro/kde/Packages-Desktop"
         overlay="/tmp/profiles/manjaro/kde/desktop-overlay/"
         profile="/tmp/profiles/manjaro/kde/profile.conf"
-        display-manager="sddm"
+        echo "sddm" > /tmp/.display-manager
         ;;
       deepin)
         target_desktop="/tmp/profiles/community/deepin/Packages-Desktop"
         overlay="/tmp/profiles/community/deepin/desktop-overlay/"
         profile="/tmp/profiles/community/deepin/profile.conf"
-        display-manager="lightdm"
+        echo "lightdm" > /tmp/.display-manager
         ;;
       gnome)
         target_desktop="/tmp/profiles/manjaro/gnome/Packages-Desktop"
         overlay="/tmp/profiles/manjaro/gnome/desktop-overlay/"
         profile="/tmp/profiles/manjaro/gnome/profile.conf"
-        display-manager="gdm"
+        echo "gdm" > /tmp/.display-manager
         ;;
       lxqt)
         target_desktop="/tmp/profiles/manjaro/lxqt/Packages-Desktop"
         overlay="/tmp/profiles/manjaro/lxqt/desktop-overlay/"
         profile="/tmp/profiles/manjaro/lxqt/profile.conf"
-        display-manager="sddm"
+        echo "sddm" > /tmp/.display-manager
         ;;
       i3)
         target_desktop="/tmp/profiles/community/i3/Packages-Desktop"
         overlay="/tmp/profiles/community/i3/desktop-overlay/"
         profile="/tmp/profiles/community/i3/profile.conf"
-        display-manager="lightdm"
+        echo "lightdm" > /tmp/.display-manager
         ;;
       bspwm)
         target_desktop="/tmp/profiles/community/bspwm/Packages-Desktop"
         overlay="/tmp/profiles/community/bspwm/desktop-overlay/"
         profile="/tmp/profiles/community/bspwm/profile.conf"
-        display-manager=""
+        echo "" > /tmp/.display-manager
         ;;
       budgie)
         target_desktop="/tmp/profiles/community/budgie/Packages-Desktop"
         overlay="/tmp/profiles/community/budgie/desktop-overlay/"
         profile="/tmp/profiles/community/budgie/profile.conf"
-        display-manager="lightdm"
+        echo "lightdm" > /tmp/.display-manager
         ;;
       cinnamon)
         target_desktop="/tmp/profiles/community/cinnamon/Packages-Desktop"
@@ -2300,18 +2300,18 @@ install_manjaro_de_wm() {
       check_for_error
       done
       # enable display manager for openrc
-      case $display-manager in
-        lightdm) sed -i "s/$(grep "DISPLAYMANAGER=" /mnt/etc/conf.d/xdm)/DISPLAYMANAGER=\"lightdm\"/g" /mnt/etc/conf.d/xdm
-              arch_chroot "rc-update add xdm default" 2>/tmp/.errlog
-              check_for_error
-          ;;
-        sdddm) sed -i "s/$(grep "DISPLAYMANAGER=" /mnt/etc/conf.d/xdm)/DISPLAYMANAGER=\"sddm\"/g" /mnt/etc/conf.d/xdm
-              arch_chroot "rc-update add xdm default" 2>/tmp/.errlog
-              check_for_error
-          ;;
-        *) echo "No display-manager needed"
-          ;;        
-      esac
+      if [[ "$(cat /tmp/.display-manager)" == sddm ]]; then
+            sed -i "s/$(grep "DISPLAYMANAGER=" /mnt/etc/conf.d/xdm)/DISPLAYMANAGER=\"sddm\"/g" /mnt/etc/conf.d/xdm
+            arch_chroot "rc-update add xdm default" 2>/tmp/.errlog
+            check_for_error
+      elif [[ "$(cat /tmp/.display-manager)" == sddm ]]; then
+            sed -i "s/$(grep "DISPLAYMANAGER=" /mnt/etc/conf.d/xdm)/DISPLAYMANAGER=\"lightdm\"/g" /mnt/etc/conf.d/xdm
+            arch_chroot "rc-update add xdm default" 2>/tmp/.errlog
+            check_for_error
+      else
+            echo "no display manager was installed"
+            sleep 2
+      fi
     else
       eval $(grep -e "enable_systemd=" $profile | sed 's/# //g')
       echo "${enable_systemd[@]}" > /tmp/.services
@@ -2322,19 +2322,19 @@ install_manjaro_de_wm() {
       arch_chroot "systemctl disable pacman-init" 2>/tmp/.errlog
       check_for_error
       # enable display manager for systemd
-      case $display-manager in
-        lightdm) arch_chroot "systemctl enable lightdm" 2>/tmp/.errlog
-              check_for_error
-          ;;
-        sdddm) arch_chroot "systemctl enable sdddm" 2>/tmp/.errlog
-              check_for_error
-          ;;
-        gdm) arch_chroot "systemctl enable gdm" 2>/tmp/.errlog
-              check_for_error
-          ;;
-        *) echo "No display-manager needed"
-          ;;        
-      esac
+      if [[ "$(cat /tmp/.display-manager)" == lightdm ]]; then
+          arch_chroot "systemctl enable lightdm" 2>/tmp/.errlog
+          check_for_error
+      elif [[ "$(cat /tmp/.display-manager)" == sddm ]]; then
+          arch_chroot "systemctl enable sdddm" 2>/tmp/.errlog
+          check_for_error
+      elif [[ "$(cat /tmp/.display-manager)" == gdm ]]; then
+          arch_chroot "systemctl enable gdm" 2>/tmp/.errlog
+          check_for_error
+      else 
+            echo "no display manager was installed"
+            sleep 2
+      fi
     fi
     # Clear the packages file for installation of "common" packages
     echo "" > ${PACKAGES}