# -*- ruby -*-

begin

require 'rgl/dot'
require 'rgl/implicit'

rescue Exception

nil

end

# Example usage: # # rake -R/home/hd/src/rgl/rakelib -f /usr/lib/ruby/gems/1.8/gems/rails-1.0.0/Rakefile dep_graph desc “Generate dependency graph of rake tasks” task :dep_graph do |task|

this_task = task.name

dep = RGL::ImplicitGraph.new do |g|
  # vertices of the graph are all defined tasks without this task
  g.vertex_iterator do |b|
    Rake::Task.tasks.each do |t|
      b.call(t) unless t.name == this_task
    end
  end
  # neighbors of task t are its prerequisites
  g.adjacent_iterator { |t, b| t.prerequisites.each(&b) }
  g.directed = true
end

dep.write_to_graphic_file('png', this_task)
puts "Wrote dependency graph to #{this_task}.png."

end