#!/bin/sh

# this is a simple script to both give some semblance of eye-candy for a tint2 executor
# and to switch virtual desktops programmatically, to be invoked by button click/scroll
# on said executor.
# copyleft 2020 Derek Stevens <drkste@zoho.com>
# MIT License - do whatever you want

# if we're feeling spartan, just print a simple string for the executor
if [ -z $1 ]; then
  echo " >>"

# if we pass '-x', spit a few hexadecimal bytes into the executor for eye-candy
elif [ "$1" = "-x" ]; then
  od -vAn -N2 -x < /dev/urandom

# otherwise switch desks
else
  currentDeskNum=$(wmctrl -d | grep -n [*] | awk '{print $1}' | awk -F : '{print $1}')
  numDesks=$(wmctrl -d | wc -l)

  case $1 in
    "-n")
      if [ ${currentDeskNum} -eq ${numDesks} ]; then
        newDesk=$(wmctrl -d | head -n 1 | awk '{print $1}')
      else
        newDesk=$(wmctrl -d | head -n $((currentDeskNum + 1)) | tail -n 1 | awk '{print $1}')
      fi
      ;;
    "-p")
      if [ ${currentDeskNum} -eq 1 ]; then
        newDesk=$(wmctrl -d | tail -n 1 | awk '{print $1}')
      else
        newDesk=$(wmctrl -d | head -n $((currentDeskNum - 1)) | tail -n 1 | awk '{print $1}')
      fi
      ;;
  esac

    wmctrl -s ${newDesk}
fi