monitor-2

#!/bin/bash

# switch between 1-monitor- and 2-monitor-mode using screenlayouts
LAYOUT_NONE="$HOME/.screenlayout/none.sh"
LAYOUT_VGA="$HOME/.screenlayout/vga.sh"
LAYOUT_HDMI="$HOME/.screenlayout/hdmi.sh"

# get the number of available/active screens
AVAILABLE_COUNT=$(xrandr | grep -E -c '\bconnected')
ACTIVE_COUNT=$(xrandr | grep -c '\*')

if [ "$AVAILABLE_COUNT" -eq 1 ]; then
  # there's only one screen available
  bash -c "$LAYOUT_NONE"
elif [ "$ACTIVE_COUNT" -gt 1 ]; then
  # there's currently more than one screen active
  bash -c "$LAYOUT_NONE"
elif xrandr | grep 'VGA1 connected' > /dev/null; then
  # VGA monitor is connected but not active
  bash -c "$LAYOUT_VGA"
elif xrandr | grep 'HDMI1 connected' > /dev/null; then
  # HDMI monitor is connected but not active
  bash -c "$LAYOUT_HDMI"
else
  # must be some unknown monitor connected...
  UNKNOWN_MONITOR=$(xrandr | grep '\bconnected' | grep -v LVDS1 | cut -d ' ' -f 1 | tr '\n' ' ')
  notify-send "Unknown monitor connected: $UNKNOWN_MONITOR"
  bash -c "$LAYOUT_NONE"
fi