A script for doing actions on windows

window-tools.sh

#!/usr/bin/env bash
#
## window-tools.sh - brings a window to the front
#

# Some bash stuff for safety, should work since the shebang uses bash
set -euo pipefail
IFS=$'\n\t'

# Usage string
_USAGE="
usage: $0 [OPTION]...
Actions:
  front <WIN>                           Bring a window to the front
  open <APPLICATION>                    Tell if an application is open or not
  list                                  List all open windows
"

# List of currently open windows, awk magic that I don't fully understand
_WINS=$(wmctrl -l | awk '{$3=""; $2=""; $1=""; print $0}')

# List of IDs of currently open windows, unused
#_WINID=$(wmctrl -l | awk '{$3=""; $2=""; print $1}')

# If no arguments are received
if [ $# -lt 1 ]
then
       printf "%s" "$_USAGE"                        # Print usage string
       else
           if [ "$1" = "front" ]                    # If first argument is "front"
           then
               wmctrl -a "$2"                       # Use wmctrl to jump to the window

           elif [ "$1" = "list" ]                   # If first argument is "list"
           then
               printf "%s\n" "$_WINS"               # Print list of currently open windows

           elif [ "$1" = "open" ]                   # If first argument is "open"
           then
               for _app in $_WINS                   # Iterate over currently open windows
               do
                   # This part is not POSIX compliant, sorry
                   if [[ "$_app" =~ $2 ]]           # If app $2 is in the list of apps
                   then
                       printf "%s is open!\n" "$2"  # Inform the user that application $2 is open
                   fi
               done
           fi
fi