aaa/lib/include.sh

#!/bin/sh

if ! [ $A3_INCLUDE ]; then
    A3_INCLUDE=1
    A3_INCLUDED=""
    A3_LIB=${A3_LIB:-/usr/lib/a3}
    is_included() {
        echo "$A3_INCLUDED" | grep -q "$1"
    }

    include() {
        [ -z "$1" ] && return 0
        is_included $1 && return 0
        . $1
        A3_INCLUDED="$A3_INCLUDED $1"
    }

    a3include_lib() {
        include $A3_LIB/$1.sh
    }
fi