#!/bin/sh

exists() {
  xrandr | grep ' connected' | grep "${1}" | wc -l
}

# commands

[ "$1" = "big" ] && \
  xrandr --output LVDS1 --off && \
  exit 0 || exit 1

[ "$1" = "small" ] && \
  xrandr --output HDMI2 --off && \
  exit 0 || exit 1

# usual setup: thinkpad x220 on dock connected to external
# monitor

[ $(exists "HDMI2") -gt 0 ] && \
  [ $(exists "LVDS1") -gt 0 ] && \
  xrandr --output LVDS1 --below HDMI2 --auto && \
  exit 0 || exit 1

# thinkpad x220 connected to display on local port

[ $(exists "HDMI1") -gt 0 ] && \
  [ $(exists "LVDS1") -gt 0 ] && \
  xrandr --output LVDS1 --below HDMI1 --auto && \
  exit 0 || exit 1

# only the thinkpad

[ $(exists "HDMI2") -eq 0 ] && \
  [ $(exists "LVDS1") -gt 0 ] && \
  xrandr --output HDMI2 --off && \
  exit 0 || exit 1

exit 1