feat(moonraker.sh): custom instance names

Signed-off-by: Dominik Willner th33xitus@gmail.com

scripts/utilities.sh

@@ -607,4 +607,14 @@ function set_hostname(){
   echo "127.0.0.1       ${new_hostname}" | sudo tee -a /etc/hosts &>/dev/null
   ok_msg "New hostname successfully configured!"
   ok_msg "Remember to reboot for the changes to take effect!"
+}
+
+function get_instance_name() {
+  ### this function takes in the full path of a systemd service file and returns
+  ### either the instance index or the custom name
+  ### input: /etc/systemd/system/klipper-name.service
+  ### returns: name
+  local instance=${1} name
+  name=$(echo "${instance}" | rev | cut -d"/" -f1 | rev | cut -d"-" -f2 | cut -d"." -f1)
+  echo "${name}"
 }