A script to switch between two monitors and a TV for a Plasma Desktop

switch.rb

#!/bin/ruby

require 'json'

LG = "DP-1"
BENQ = "DP-2"
TV = 'HDMI-A-1'

def switch_monitor(name, state) = `kscreen-doctor output.#{name}.#{state ? 'enable' : 'disable'}`

active = JSON.parse(`kscreen-doctor -j`, symbolize_names: true)[:outputs].find{ _1[:enabled] }[:name]

if active == TV
  switch_monitor(LG, true)
  switch_monitor(BENQ, true)
  switch_monitor(TV, false)
else
  switch_monitor(TV, true)
  switch_monitor(LG, false)
  switch_monitor(BENQ, false)
end