test.rb

require "rubygems"
require "grit"
include Grit

def transversal_path(node, level)
  node.contents.each do |child|
    if child.class == Grit::Blob
      puts " "*level*2+" "+child.name
    else
      puts " "*level*2+" "+"[#{child.name}]"
      transversal_path(child, level+1)
    end
  end
  return nil
end

repo = Repo.new(Dir.pwd)

root = repo.commits.first.tree
transversal_path(root, 1)