A script that will attempt to show you which of your brew casks are outdated compared to current versions

brew-cask-outdated

#!/bin/bash

vercomp () {
    if [[ $1 == $2 ]]
    then
        return 0
    fi
    local IFS=.
    local i ver1=($1) ver2=($2)
    # fill empty fields in ver1 with zeros
    for ((i=${#ver1[@]}; i<${#ver2[@]}; i++))
    do
        ver1[i]=0
    done
    for ((i=0; i<${#ver1[@]}; i++))
    do
        if [[ -z ${ver2[i]} ]]
        then
            # fill empty fields in ver2 with zeros
            ver2[i]=0
        fi
        if ((10#${ver1[i]} > 10#${ver2[i]}))
        then
            return 1
        fi
        if ((10#${ver1[i]} < 10#${ver2[i]}))
        then
            return 2
        fi
    done
    return 0
}

RED='\033[0;31m'
GREEN='\033[0;32m'
BLUE='\033[0;33m'
NC='\033[0m' # No Color

warn () {
    lapp=$1
    lmsg=$2
    printf "%-20s: %-47s %b%s%b\n" $lapp "" $RED "$lmsg" $NC
}

applist=$@
if [ -z "$applist" ]; then
    applist=$(brew cask list)
fi
for app in $applist; do
    latest=$(brew cask info $app | grep "$app: " | sed -e 's/^.*: //')
    if [[ "$latest" == "latest" ]]; then
        warn "$app" "no version info found in brew cask info"
        continue
    fi
    appname=$(brew cask info $app | egrep '\((app|prefpane)\)' | sed -e 's/(app)//' -e 's/(prefpane)//' -e 's/.app//' -e 's/.prefPane//' -e 's/^[[:space:]]*//' -e 's/[[:space:]]*$//' -e 's/.*\///')
    while read -r subapp; do
        if [[ -z "$subapp" ]]; then
            warn "$app" "didn't find any actual apps in brew cask info"
            continue
        fi
        installed=$(osascript -e "version of app \"$subapp\"")
        new=""
        if [[ -z "$installed" ]]; then
            warn "$app" "no installed version found :(" 
            continue
        fi
        ./version-compare "$installed" "$latest"
        case $? in
            0) new="";;
            1) new="${BLUE}cask outdated, consider PR?${NC}";;
            2) new="${GREEN}new version in cask${NC}";;
        esac
        printf "%-20s: %-20s (%10s vs %10s) %b\n" "$app" "$subapp" "$installed" "$latest" "$new"
    done <<< "$appname"
done