From: transfire@...
Date: 2006-06-03T21:42:51+09:00
Subject: Re: Tasks with Parameters: Can it be done?


Logan Capaldo wrote:
> On Jun 1, 2006, at 8:47 PM, transfire@gmail.com wrote:
>
> >
> > Logan Capaldo wrote:
> >> On May 31, 2006, at 4:03 PM, transfire@gmail.com wrote:
> >>
> >> This may be the Lisp I just ate talking but...
> >>
> >> task :t1 => [ [:t2, arg1, arg2, argetc], [ :t3 ] ] do
> >>     ...
> >> end
> >>
> >> task :t2 do |a1, a2, *aetc|
> >>    ...
> >> end
> >>
> >> You can even do is_a? Symbol (I know, not ducktype-y enough) and not
> >> have to use a nested-array for tasks with no args
> >> e.g.
> >>
> >> task :t7 => [ :t1, :t3, [:t4, "one", "two"], :t6 ] do
> >>   ...
> >> end
> >
> > Oh right. A clear solution that didn;t even occur to me (duh). But
> > that's probably b/c you are right. At that point it gets too Lispy. I
> > really would like a way to do it in the code of the method somehow
> > though. As I mentioned, using memoize get very close to such a
> > solution, but the trick is it has to be a sort of "relative cache"
> > i.e.
> > cacheing in a sort of namespace relative to the initiating task. And I
> > don't know if that's possible. I imagine trying to control it with
> > something lije this:
> >
> >   task :t7 do
> >     preq { t1; t2; t4("one", "two"); t6 }
> >     ...
> >   end
> >
> > But how would one monitor which methods have been executed?
> >
> > T.
> >
> >
>
> Maybe make tasks objects....
>
> task :t7 do
>    preq t1, t2, t4['one', 'two'], t6
> end
>
>
> def preq(*args)
>    args.each do |task|
>     if task.executed?
>         ...
>      else
>         task.call
>         ...
>      end
> end
>
>
>
> #[] can set some sort of @args var that gets nil-ed on execution. (Or
> maybe it returns a new object with references to the task and list of
> args).

Hmm... Yea I suppose one could do something like that. You particuklar
syntax wouldn't work tough, but it could be done with something like:

  task :t7 do
     task_send :t1
     task_send :t2
     task_send :t4, 'one', 'two'
     task_send :t6
  end

T.