From: Logan Capaldo <logancapaldo@...>
Date: 2006-06-03T03:39:24+09:00
Subject: Re: Tasks with Parameters: Can it be done?


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).