switch-to-wayland

#!/bin/bash

usage() {
  printf '%s\n' "Usage: switch-to-wayland [-h]
switch-to-wayland switches to a specific window using gdbus.
Only works with GNOME Shell, but does work with Wayland display
server.

where:
  -h, --help  - show this help text
  -c, --class - set the window class to switch to"
}

main() {
  # Pass a message to the window manager to activate the window with the
  # provided WM_CLASS.
  result="$(gdbus call \
    --session \
    --dest org.gnome.Shell \
    --object-path /org/gnome/Shell \
    --method org.gnome.Shell.Eval "
global
  .get_window_actors()
  .map(a=>a.meta_window)
  .find((w) => {
    return w.get_wm_class() === '${WM_CLASS}'
  })
  .activate(0)")"

  # If the window was not found, open the application using the provided
  # command
  if ! grep -q '^(true,' <<< "${result}" ; then
    "${OPEN_CMD}"
  fi
}

# Option parsing
declare PARAMS=''
declare WM_CLASS=''
declare OPEN_CMD=''
while (( "$#" )); do
  case $1 in
    -h|--help)  # display help message
      usage
      exit 1
      ;;
    -c|--class) # set the window class
      WM_CLASS=$2
      shift 2
      ;;
    --)  # End argument parsing
      shift
      break
      ;;
    -*|--*)  # unsupported flags
      echo "Unsupported flag: $1" >&2
      usage
      exit 1
      ;;
    *)  # preserve positional arguments
      PARAMS="${PARAMS} $1"
      shift
      ;;
  esac
done

# set positional arguments in their proper place
eval set -- "${PARAMS}"

# parse positional arguments
OPEN_CMD="$1"

# validate parameters
if [[ -z "${OPEN_CMD}" ]]; then
  echo "Missing required argument: OPEN_CMD" >&2
  usage
  exit 1
fi

# Freeze configuration flags
readonly WM_CLASS OPEN_CMD

main "$@"