From: "Marc H." <mphoeppner@...>
Date: 2011-12-07T17:46:54+09:00
Subject: Rake question

Hi,
I have a general question regarding rake:

Say I have a list of files (based on file extension), that all need to
be processed in the same way. The output of this processing is required
by a downstream task. How do I run this in rake?

My approach was:

my_files.each do |file|

 target_file = '#{file}.transformed'
 file target_file => file do
   # transform here
 end

 task :transform => target_file
end

next_file = 'transformed_files.txt'
file next_file => :transform do
 # Do something with all transformed files to produce 1 output file
end

And this fails, complaining that it does not know how to build
:transform

Is this a syntactic issue? The workflow above correctly iterates over
the input files, creates transformed files and then complains that it
doesn't know how to build :transform. I am at a loss...
Any 'better' ways of doing this?

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