brew_cask_install() {
  if ! brew_cask_is_installed "$1"; then
    brew cask install "$@"
  fi
}

brew_cask_is_installed() {
  local NAME=$(brew_cask_expand_alias "$1")
  brew cask list -1 | grep -Fqx "$NAME"
}

brew_cask_expand_alias() {
  brew cask info "$1" 2>/dev/null | head -1 | awk '{gsub(/:/, ""); print $1}'
}