.profile bridge with .conf/environment.d/*.conf

.profile

for conf in "$HOME/.config/environment.d"/*.conf
do
    if [ -r "$conf" ]
    then
        substituted="/tmp/${LOGNAME}.envs.systemd.blows.$$.txt"
        envsubst < "$conf" > "$substituted"
        while read -r line
        do
            new_cleaned_up="${line%#*}"
            cleaned_up=""
            while [ "$new_cleaned_up" != "$cleaned_up" ]
            do
                cleaned_up="$new_cleaned_up"
                new_cleaned_up="${cleaned_up%%[[:space:]]}"
            done
            cleaned_up="$new_cleaned_up"
            unset new_cleaned_up

            if [ "$cleaned_up" != "${cleaned_up%%=*}" ]
            then
                var="${cleaned_up%%=*}"
                val="${cleaned_up#*=}"
                eval "${var}='${val}'"
                export "$var"
                unset var val
            fi
            unset cleaned_up
        done < "$substituted"
        unset line

        rm -f "$substituted"
        unset substituted
    fi
done
unset conf