Shallow file finder

gistfile1.rb

require 'pathname'

# My answer to stackoverflow question posted here:
# http://stackoverflow.com/questions/12684736/a-twist-on-directory-walking-in-ruby
class ShallowFinder
  def initialize(root)
    @matches = {}
    @root = Pathname(root)
  end

  def matches
    while match = next_file
      @matches[match.parent.to_s] = match
    end

    @matches.values
  end

  private

  def next_file
    @root.find do |entry|
      Find.prune if previously_matched?(entry)
      return entry if entry.file?
    end
    nil
  end

  def previously_matched?(entry)
    return unless entry.directory?
    @matches.key?(entry.to_s)
  end
end

puts ShallowFinder.new('Root').matches