[Omake] Testing whether a target has been defined

[Jason Hickey]

malc wrote:
> rule(p1, p2, p3, p4, p5, p6) =
>     new-body =
>         append-body()
>             apply($(fun $(p6)))
>     old-rule($(p1), $(p2), $(p3), $(p4), $(p5), $(new-body))
>     export
...
> Now this will only work if we substitute $(new-body) with $(p6), why?

Well...  In the end I would say that is all not very well worked out:/ 
I do feel that the ability to add rule-wrappers is a reasonable idea, 
but it should be very clearly defined (unlike now).

BTW, I tried your example.  The reason it doesn't work centers around 
binding.  Basically, in $(fun $(p6)), "$(p6)" is the function body--not 
the value of p6, but the literal expression "$(p6)".  So all of these 
functions have the same body, which is of course crazy.

I like your example, I think it can help clarify the scoping issue. 
For now I can't offer any help, but I think you've given us something to 
work with.

Jason

-- 
Jason Hickey                  http://www.cs.caltech.edu/~jyh
Caltech Computer Science      Tel: 626-395-6568 FAX: 626-792-4257