GVM Grails/Griffon auto switch for zsh.

gistfile1.sh

__gvm_switch() {
    if [ -s "gradle.properties" ]; then
        local candidate current target
        candidate=grails
        target=$(cat gradle.properties | grep --color=never 'grailsVersion' | sed "s_grailsVersion=\(.*\)_\1_g")
        if [[ $target != '' ]]; then
            current=$(eval echo '$'$(echo $candidate | tr '[:lower:]' '[:upper:]')_HOME | sed -e "s_$GVM_DIR/$candidate/__g")
            if [[ $current != $target ]]; then
                echo "Switching to $candidate $target ..."
                gvm offline enable > /dev/null
                gvm use $candidate $target
                gvm offline disable > /dev/null
            fi
        fi
    fi
    if [ -s "application.properties" ]; then
        local arr candidate current target
        arr=($(cat application.properties | grep --color=never 'app.\(grails\|griffon\).version' | sed "s_app.\(.*\).version=\(.*\)_\1 \2_g"))
        candidate=${arr[1]}
        target=${arr[2]}
        current=$(eval echo '$'$(echo $candidate | tr '[:lower:]' '[:upper:]')_HOME | sed -e "s_$GVM_DIR/$candidate/__g")
        if [[ $current != $target ]]; then
            echo "Switching to $candidate $target ..."
            gvm offline enable > /dev/null
            gvm use $candidate $target
            gvm offline disable > /dev/null
        fi
    fi
}
chpwd() {
    __gvm_switch
}