Homebrew Cask Upgrade

cask

#!/usr/bin/env bash

readonly local caskroom="/usr/local/Caskroom"

upgrade () {
  casks=($(brew cask list))

  for cask in ${casks[@]}; do
    current="$(brew cask info ${cask} | sed -n '1p' | sed -n 's/^.*: \(.*\)$/\1/p')"
    installed=($(ls ${caskroom}/${cask}))
    if (! [[ " ${installed[@]} " == *" ${current} "* ]]); then
      echo "Upgrading ${cask} to v${current}."
      (set -x; brew cask install ${cask} --force; rm -rf ${caskroom}/${cask}/${installed[@]})
    else
      echo "${cask}@${current} already installed."
    fi
  done
}


main () {
  local args=("$@")

  case "$1" in
    upgrade) upgrade "${args[@]}" ;;
    *) brew cask "${args[@]}" ;;
  esac
}

main "$@"

does this support upgrading a single cask supplied as an arg?

@ibrokemypie sorry I missed this comment, no it doesn't. It just loops through and updates all casks like brew upgrade does.