Bash autoload

autoload.sh

# autoload bash scripts. Much faster than `source script.sh`
# usage: autoload script.sh        
autoload() {
    [ -f "$1" ] || { echo "Usage ${FUNCNAME[0]} <filename>"; return 1;}
    filename="$1"
    loadname="$(sed 's:\..*::' <<< $(basename $filename))"
    if [ -z "$(eval echo \${${loadname}_loaded})" ]; then
        functions=$(command grep -o "^[a-zA-Z0-9_:]* *()" $filename | sed 's/()//')
        for f in $functions; do
            eval "
                $f() {
                    if [ \"$(eval echo \${${loadname}_loaded})\" != 2 ]; then
                        . $filename
                        eval ${loadname}_loaded=2
                        eval $f \$@
                    fi
                }"
        done
        eval ${loadname}_loaded=1
    fi
    unset loadname filename
}