Dual Monitors configuration from command line

mon

#!/usr/bin/env bash

# Summary: Enables and disables monitors.
# Usage: mon <command:|e|i|l|r|m>
# Help:
#   Params:
#   <command>
#   - e|external - Enable only external. Default.
#   - i|internal - Enable only internal (built-in).
#   - l|left - Enable both but left is primary.
#   - r|right - Enable both but right is primary.
#   - m|irror - Enable both and show the same on both.
#
#   Installation:
#   1. Add script 'mon' to the PATH.
#   2. Update section 'Settings'.
#
#   WARNING: Update names of internal and external monitors:
#   To get names of monitors run: xrandr;
configure_monitors() {
  local command=${1:-e};

  # Settings.
  # Position of the external monitor.
  local position="right";
  # Machine name of the monitors.
  local internal="eDP-1";
  local external="DP-1";
  # Should terminal window be closes when configuration completed.
  local do_close_terminal="no";

  # Do the magic.
  xrandr --auto;
  if [[ $command =~ ^(external|ext|e)$ ]]; then :;
    xrandr --output $internal --off --output $external --auto;

  elif [[ $command =~ ^(internal|int|i)$ ]]; then :;
    xrandr --output $internal --auto --output $external --off;

  elif [[ $command =~ ^(right|r)$ ]]; then :;
    xrandr --output $external --primary "--${position}-of" $internal;

  elif [[ $command =~ ^(left|l)$ ]]; then :;
    #Built-in is primary on left:
    xrandr --output $external "--${position}-of" $internal;
    xrandr --output $internal --primary;

  elif [[ $command =~ ^(mirror|m)$ ]]; then :;
    xrandr --auto;
  fi;

  # Close terminal window.
  if [[ $do_close_terminal == "yes" ]]; then :;
    # Delay required to browser have time to start process.
    sleep 1;
    # Get process id ($$) and kill parent process to close terminal.
    PPPID=$(awk '{print $4}' "/proc/$$/stat");
    kill -9 $PPPID;
  fi;
}

configure_monitors "$@";