require 'erb'

##
# Caches compiled ERB templates.
#
# Usage:
# 
#   c = ERB::Cached.new
#   c.add_erb :test, "The value of x is <%= x %>"
#   p c.test(:x => 5)

class ERB::Cached

  ##
  # Add cached ERB +template+ as +name+.
  #
  # You can call it later with class.+name+(:arg1 => val1, ...)

  def add_erb(name, template)
    ERB.new(template).def_method self.class, "run_#{name}"
  end

  ##
  # Dispatches to the compiled ERB template +action+, setting variables from
  # +options+.

  def method_missing(action, options = {})
    super unless self.respond_to? "run_#{action}"

    options.each do |attr, value|
      self.class.send :attr_accessor, attr unless self.respond_to? attr
      self.send "#{attr}=", value
    end

    return self.send("run_#{action}")
  end

end

if __FILE__ == $0 then
  c = ERB::Cached.new
  c.add_erb :test, "The value of x is <%= x %>"
  p c.test(:x => 5)
end