rules for rake-pipeline of my blog

Assetfile

# vim: filetype=ruby
output "compiled/files"

class AsyFilter < Rake::Pipeline::Filter
    attr_accessor :config

    def initialize
        @output_name_generator = proc { |fn, wrap|
            @config = {'ext' => 'png', 'opt' => ''}

            /^---$(.*?)^---$/m.match(wrap.read) do 
                require 'yaml'
                config.merge!(YAML::load($1))
            end
            ext = config['ext']
            fn.sub(/\.[^.]+$/, '.' + ext)
        }
    end

    def generate_output(inputs, output)
        system("asy #{config['opt']} -f #{config['ext']} -o " +
               File.join(output.root,output.path) + " " +
               File.join(inputs[0].root, inputs[0].path))
    end
end

input "files" do
    match '**/*.asy' do
        filter AsyFilter
    end

    filter Rake::Pipeline::ConcatFilter
end