2014-04-28

Create a graph of all defined Classes

#!/usr/bin/env ruby

Author : Emad Elsaid (https://github.com/blazeeboy)

Output example : http://imgur.com/Z1LfLn1

install ruby-graphviz then install graphviz from http://graphviz.org/

require 'graphviz' # gem install ruby-graphviz --no-document

get all constants in namespace then convert them from symbols to their objects and select the classes out of them, you may include modules if you wish

classes = Class.constants
                      .map { |c| Class.const_get c }
                      .select { |c| c.is_a? Class }
g = GraphViz.new( :G, :type => :digraph )

Create nodes

nodes = Hash[classes.map {|c| [c, g.add_nodes( c.to_s )] }]
nodes.each do |klass,node|
  begin
    g.add_edges node, nodes[klass.superclass]
  rescue # do nothing
  end
end

Generate output image

g.output( :png => "/Users/blaze/Desktop/classes_graph.png" )

you can output PDF with small modification

g.output( :pdf => "/Users/blaze/Desktop/classes_graph.pdf" )```