def walk_method(name)
      method_choice  = /#{Regexp.escape name}/
      invalid_choice = false

      # Continue walking up and down the stack until the users selects "exit"
      while method_choice != :exit
        print_method method_choice unless invalid_choice
        STDOUT.puts "\n\n"

        # Determine callers and callees for the current frame
        new_frames  = frames.select  {|_, info| info[:name] =~ method_choice }
        new_choices = new_frames.map {|frame, info| [
          callers_for(frame).sort_by(&:last).reverse.map(&:first),
          (info[:edges] || []).map{ |k, w| [data[:frames][k][:name], w] }.sort_by{ |k,v| -v }.map(&:first)
        ]}.flatten + [:exit]

        # Print callers and callees for selection
        STDOUT.puts "Select next method:"
        new_choices.each_with_index do |method, index|
          STDOUT.printf "%2d)  %s\n", index + 1, method.to_s
        end

        # Pick selection
        STDOUT.printf "> "
        selection = STDIN.gets.chomp.to_i - 1
        STDOUT.puts "\n\n\n"

        # Determine if it was a valid choice
        # (if not, don't re-run .print_method)
        if new_choice = new_choices[selection]
          invalid_choice = false
          method_choice = new_choice == :exit ? :exit : %r/^#{Regexp.escape new_choice}$/
        else
          invalid_choice = true
          STDOUT.puts "Invalid choice.  Please select again..."
        end
      end
    end
Walk up and down the stack from a given starting point (name).  Loops
until `:exit` is selected