touchpad enable/disable with autocomplete

bashfiles

# ~/.bash.d/touchpad.sh
touchpad () 
{ 
    echo "WARNING: This script is currently hardware-specific.";
    echo "         You should only use this on the Dell XPS 13.";
    local arg=$1;
    local touchpad_id=$(xinput list | grep Trackpad | sed 's/^.*id=//' | sed -re 's/[[:space:]]+.*//');
    case $arg in 
        info)
            xinput list | grep --line-buffered Trackpad
        ;;
        enable)
            xinput set-prop ${touchpad_id} "Device Enabled" 1
        ;;
        disable)
            xinput set-prop ${touchpad_id} "Device Enabled" 0
        ;;
    esac
}

# ~/.bash.d/completions/touchpad.sh
_touchpad() {
  local cur prev opts
  COMPREPLY=()
  cur="${COMP_WORDS[COMP_CWORD]}"
  prev="${COMP_WORDS[COMP_CWORD-1]}"
  opts="info enable disable"

  case "${prev}" in
    file)
      COMPREPLY=( $(compgen -f ${cur}) )
      return 0
      ;;
    hostname)
      COMPREPLY=( $(compgen -A hostname ${cur}) )
      return 0
      ;;
    *)
      ;;
  esac

  COMPREPLY=( $(compgen -W "${opts}" -- ${cur}) )
}
complete -F _touchpad touchpad