INTRO
One-level
app(App,["ebin",Module|_]) -> load_ebin(App,Module);
app(App,["priv"|_]) -> compile(App);
app(App,["src"|_]) -> compile(App);
app(_,_)-> ok.
Two-level
otp(["deps",App|Rest]) -> app(App,Rest);
otp(["apps",App|Rest]) -> app(App,Rest);
otp([Some|Path]) -> app(top(),[Some|Path]);
otp(_) -> ok.