#!/bin/bash

# name: switch_desktop.sh
# version: 0.1
# author: david@socialnerds.org
# description: switch to next, previous, specific desktop.
#              you can also toggle between first and second desktop.
#
# usage: ./switch_desktop.sh next|prev|<int>|toggle

num=$(wmctrl -d | grep "*" | awk '{print $1}')
lockfile="/tmp/switch_desktop.lock"

if [ ! -f $lockfile ]; then
  echo "creating lockfile [$lockfile]"
  touch $lockfile

  if [[ "$1" =~ ^[0-9]+$ ]]; then
    echo "switching to specific desktop [$1]"
    wmctrl -s $1
  elif [ "$1" == "next" ]; then
    echo "switching to next desktop [$next]"
    next=$((num+1))
    wmctrl -s $next
  elif [ "$1" == "prev" ]; then
    if [ $num -ne 0 ]; then
      echo "switching to previous desktop [$prev]"
      prev=$((num-1))
      wmctrl -s $prev
    fi
  elif [ "$1" == "toggle" ]; then
    if [ $num -eq 0 ]; then
      echo "switching to second desktop"
      wmctrl -s 1
    else
      echo "switching back to first desktop"
      wmctrl -s 0
    fi
  fi
  echo "waiting for 0.5 seconds"
  sleep 0.5
  echo "cleaning up lockfile [$lockfile]"
  rm $lockfile
fi