#! /bin/sh

cmd=${1%% *}
[ "$cmd" = "$1" ] || args=${1#* }
case $cmd in
    calc)
        printf "%s = " "$args"
        echo "$args" | bc -l
        ;;
    units)
        src=$(printf "%s" "$args" | sed 's/ ->.*//')
        dst=$(printf "%s" "$args" | sed 's/.*-> //')
        units -1 -v -- "$src" "$dst"
        ;;
    *)
        exit 1
        ;;
esac