Upgrade and clean macOS casks, the lazy way

cask.sh

#!/usr/bin/env bash

# forked from: https://gist.github.com/joshmanders/515d869a1fc059a1692c20ecdbaae2d3
# inspired by: https://gist.github.com/atais/9c72e469b1cbec35c7c430ce03de2a6b

# Installation
# $ ln -s /path/to/this/cask.sh /usr/local/bin/cask
#
# Usage
# $ cask upgrade (check newest release and download them)
# $ cask clean (keep only the latest release and remove the oldest)

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

red=`tput setaf 1`
green=`tput setaf 2`
orange=`tput setaf 3`
blue=`tput setaf 4`
reset=`tput sgr0`

upgrade() {
    # update brew before doing anything
    (set -x; brew update;)

    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 [[ "${current}" == "latest" ]]; then
            echo "${orange}Skip${reset} ${red}${cask}${reset} ${orange}tagged with${reset} ${blue}latest${reset} ${orange}version...${reset}"

        elif (! [[ " ${installed[@]} " == *" ${current} "* ]]); then
            echo "${red}${cask}${reset} requires ${red}update${reset}."
            echo "Upgrading ${red}${cask}${reset} to v${blue}${current}${reset}."
            (set -x; brew cask install ${cask} --force;)
        else
            echo "${red}${cask}${reset}@${blue}${current}${reset} is ${green}up-to-date${reset}."
        fi
    done
}

# won't work with version tag "latest"
# won't work with casks not following strict semantic versions (http://semver.org/)
clean() {
    casks=($(brew cask list))
    seems_cleaned=true
    for cask in ${casks[@]}
    do
        installed=($(ls ${caskroom}/${cask}))
        if [ ${#installed[@]} -gt 1 ]; then
            seems_cleaned=false
            echo "${red}${cask}${reset} has installed multiple ${red}versions${reset}."

            latest=$(ls -v1r ${caskroom}/${cask} | head -1)
            echo " -> ${green}keeping latest version:${reset} ${blue}$latest${reset}"
            outdated=$(ls -v1r ${caskroom}/${cask} | awk 'NR>1')
            for version in $outdated; do
                echo " -> ${orange}removing outdated version:${reset} ${blue}${version}${reset}"
                (set -x;rm -rf ${caskroom}/${cask}/${version};)
            done
        fi
    done

    if [[ seems_cleaned ]]; then
        echo "${green}All casks seems clean!${reset}"
    fi
}


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

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

main "$@"