cask-update.sh

#!/usr/bin/env bash
# ORIGIN: http://apple.stackexchange.com/a/231020
(set -x; brew upgrade;)
(set -x; brew cleanup;)
(set -x; brew cask cleanup;)
(set -x; brew prune;)
(set -x; brew doctor;)

red=$(tput setaf 1)
green=$(tput setaf 2)
reset=$(tput sgr0)

casks=( $(brew cask list) )

for cask in ${casks[@]}
do
    version=$(brew cask info $cask | sed -n "s/$cask:\ \(.*\)/\1/p")
    installed=$(find "/usr/local/Caskroom/$cask" -type d -maxdepth 1 -maxdepth 1 -name "$version")

    if [[ -z $installed ]]; then
        echo "${red}${cask}${reset} requires ${red}update${reset}."
        (set -x; brew cask uninstall $cask --force;)
        (set -x; brew cask install $cask --force;)
    else
        echo "${red}${cask}${reset} is ${green}up-to-date${reset}."
    fi
done