example.png

module_graph.rb

require 'graphviz'

def add_module(g, parent, m, visited, depth = 0)
  return if depth > 100
  if visited[m]
    g.add_edges(parent, visited[m])
    return
  end
  visited[m] = current = g.add_nodes(m.to_s)

  if parent
    g.add_edges(parent, current)
  end

  m.constants.each do |c|
    if m.const_get(c).is_a?(Module) || m.const_get(c).is_a?(Class)
      add_module(g, current, m.const_get(c), visited, depth.succ)
    end
  end
end

# Create a new graph
g = GraphViz.new( :G, :type => :digraph )
visited = {}
add_module(g, nil, SomeModule, visited)
g.output( :png => "#{visited.keys.first.name}.png" )