From: Mark Wilson <mwilson13@...>
Date: 2003-02-08T06:32:41+09:00
Subject: Re: Dir.pushdir and Dir.popdir


On Friday, February 7, 2003, at 04:10 PM, Wesley J Landaker wrote:

> [snip]
> I don't know if this functionality is included somewhere else and I 
> just
> missed it, but it sure is handy to have Dir be able to push and pop
> directories as well as just chdir. I often use something like this:
>
> [snip]

The standard library includes this functionality in shell.rb.

pushdir(path = nil) {|| ...}

# File lib/shell.rb, line 163
   def pushdir(path = nil)
     if iterator?
       pushdir(path)
       begin
	yield
       ensure
	popdir
       end
     elsif path
       @dir_stack.push @cwd
       chdir path
       notify "dir stack: [#{@dir_stack.join ', '}]"
       self
     else
       if pop = @dir_stack.pop
	@dir_stack.push @cwd
	chdir pop
	notify "dir stack: [#{@dir_stack.join ', '}]"
	self
       else
	Shell.Fail DirStackEmpty
       end
     end
   end

popdir()

# File lib/shell.rb, line 189
   def popdir
     if pop = @dir_stack.pop
       chdir pop
       notify "dir stack: [#{@dir_stack.join ', '}]"
       self
     else
       Shell.Fail DirStackEmpty
     end
   end