windows 下的 tree 命令

中午做了个小demo，实现windows下的tree命令。

require "pathname"

class Test1
  
  def initialize
  end
  
  def test_tree
    dir = "D:/amp/MySQL Server 5.0"
	puts dir
	@lasts = []
    trav_dirs dir,1
  end
  
  def trav_dirs(dir,deep)
	if File.directory?(dir) 
      subs = Pathname.new(dir).children
      0.upto(subs.size-1) { |i|
        @lasts << (i == subs.size-1)
        prt_node subs[i], deep
		trav_dirs subs[i], deep + 1
		@lasts.pop
      }
    end
  end
  
  def prt_node(dir,deep)
    line = ''
    0.upto(deep-2) { |i|
      line = line + (@lasts[i] ? ' ' : '│') + ' '
    }
    puts line + (@lasts[-1] ? '└' : '├' ) + '─ ' + File.basename(dir)
	
  end
  
end

Test1.new.test_tree

运行结果如下：