From: Niklas Frykholm <niklas@...>
Date: 2005-09-05T21:44:27+09:00
Subject: Re: Rake: multiple prerequisites in rule?

Martin Honermeyer wrote:

>desc "Make ERB templates from Kwartz html and plogic files"
>SRC = FileList['app/views/**/*.html']
>OBJ = SRC.ext('rhtml')
>task :templates => [OBJ]
>
>rule '.rhtml' => ['.html'] do |t|
>  sh "kwartz -Rails -e -p #{t.source.ext('plogic')} --extract=content
>#{t.source} > #{t.name}"
>end
>
>This works. The problem is that the .rhtml is only regenerated when
>the .html changes. I tried adding the .plogic file as another prerequisite:
>
>rule '.rhtml' => ['.html', '.plogic'] do |t|
>
>That makes Rake say
>
>Too many dependents specified in rule .rhtml: [".html", ".plogic"]
>
>Apparently, it's not possible to have multiple prerequisites for a rule.
>Does anyone have a hint on this?
>
Not as elegant as using a rule perhaps, but you could write

    SRC.each {|src|
       rhtml = src.ext('rhtml')
       plogic = src.ext('plogic')
       file src => [rhtml, plogic] do |t|

// Niklas