From: Joel VanderWerf <vjoel@...>
Date: 2006-04-26T14:18:49+09:00
Subject: Re: Rake task dependeny vs. method call

Joel VanderWerf wrote:
> ara.t.howard@noaa.gov wrote:
>> On Wed, 26 Apr 2006, Trans wrote:
>>
>>> Just for fun I put together this simple demonstration.
>> check out tsort.  you need it to work if you have a diamond like
>>
>>   b => a
>>   c => a
>>   d => b
>>   d => c
>>
>> else you'll run 'a' twice.  tsort let's you build a dag of dependancies and
>> even detects cycles.
>>
>> cheers.
>>
>>
>> -a
> 
> He (OP) already did the t-sort, implicitly.
> 
> Here's a slightly modified version of T's code (#cache happens to be the
> name of #memoize in my libs). The output is:

It does the right thing on cycles, too:

task :a => :b do puts "a" end
task :b => :c do puts "b" end
task :c => :a do puts "c" end

Output:

c
b
a

-- 
      vjoel : Joel VanderWerf : path berkeley edu : 510 665 3407