monitors

#!/usr/bin/env ruby
# frozen_string_literal: true

require 'open3'

def get_serial edid
  stdin, stdout, wait_thr = Open3.popen2 'edid-decode'

  edid.each do |line|
    stdin.puts line[/\S+/]
  end
  stdin.close

  serial = nil
  stdout.each do |line|
    # puts "Decoded: #{line}"
    case line
    when /^\s*Serial Number:\s*(.*)/
      serial = $1
    end
  end

  return serial
end

def serial2output
  edid = nil
  output = nil
  monitors = {}
  IO.popen('xrandr --properties').each do |line|
    case line
    when /^(\w+-\d+)/
      output = $1
    when /^\s+EDID:/
      edid = []
    when /:/
      if edid
        serial = get_serial edid
        monitors[serial] = output if serial

        edid = nil
      end
    else
      edid << line if edid
    end
  end

  monitors
end

def position2name
  mapping = serial2output

  {
    builtin: 'eDP-1',
    top: mapping['204796'],
    bottom: mapping['435'], # mapping['8706'],
  }
end

monitors = position2name

def run cmd
  p cmd
  system cmd
end


width = 3840
height = 2400
scale = 0.6
run "xrandr --output #{monitors[:builtin]} --mode #{width}x#{height} --pos 0x#{( (2160 * 2 - height * scale)/2 ).to_int} --rotate normal --scale #{scale}"

left = (width * scale).to_int
if monitors[:top]
  run "xrandr --output #{monitors[:top]} --mode 3840x2160 --pos #{left}x0 --rotate inverted"
end

if monitors[:bottom]
  run "xrandr --output #{monitors[:bottom]} --primary --mode 3840x2160 --pos #{left}x2160 --rotate normal"
end