block_dsl.rb

class Context
  def self.path(fname)
    puts "Creating file #{fname}"
  end
end

def template(filename, &block)
  context = Class.new(Context)
  context.class_eval(&block)
  context
end


template("/tmp/foo") do
  path "/tmp/foo.txt"
end

# output:
# Creating file /tmp/foo.txt