graph.rb

require 'rubygems'
require 'graphviz'

path, output = ARGV

regex = /render\W+:partial\W+=>\W+"([\w\/]+)"/

@nodes = {}
@graph = GraphViz.new( :structs, :type => :digraph )

def absolutize(container, partial)
  dir = File.dirname(container)
  unless partial.include? "/"
    partial = File.join(dir, "_#{partial}")
  else
    File.join(File.dirname(partial), "_#{File.basename(partial)}")
  end
end

def node(path)
  @nodes[path] ||= @graph.add_node(path)
end

Dir.chdir(path) do
  Dir.glob("**/*.*").each do |file|
    File.open(file, 'r').each_line do |line|
      if match = line.match(regex)
        partial = match[1]
      
        abs_partial = absolutize(file, partial)
        abs_file    = file.gsub(/\..*$/, '')
      
        partial_node = node(abs_partial)
        file_node    = node(abs_file)
    
        @graph.add_edge(partial_node, file_node)
      end
    end
  end
end

@graph.output( :png => output )