#!/usr/bin/env ruby

# print paths read from standard input as an indented tree structure.

root = {}

ARGF.each_line do |line|
  path = line.strip
  next if path.empty?
  node = root
  path.split("/").each do |part|
    node[part] ||= {}
    node = node[part]
  end
end

def print_tree node, depth = 0
  node.each_key do |name|
    puts "  " * depth + name
    print_tree node[name], depth + 1
  end
end

print_tree root