From: Massimiliano Mirra <list@...>
Date: 2002-01-13T10:00:07+09:00
Subject: Re: Dir.entries have no home

On Sun, Jan 13, 2002 at 02:43:33AM +0900, Massimiliano Mirra wrote:
> > I'd like to be able to ask questions of directory entries, like are
> > you a directory, what is your last-written date, and so on.
> Does this help you?  Should be pretty portable, too.

Some afterthoughts...

> class XDir
>   def XDir.entries(dir)
>     dir = File.expand_path(dir)
>     Dir.entries(dir).collect {|name| FileDesc.new(dir, name)}
>   end
> end

This could more simply be:

class Dir
  def Dir.desc_entries(dir)
    dir = File.expand_path(dir)
    Dir.entries(dir).collect {|entry| FileDesc.new(dir, name)}
  end
end

> class FileDesc
>   def initialize(location, name)
>     @location, @name, @path = location, name, File.join(location, name)
>     @stat = File.stat(@path)
>   end
>   attr_reader :location, :name, :path, :stat
> 
>   def method_missing(method_id, *args, &block)
>     if @stat.respond_to? method_id
>       @stat.send(method_id, *args, &block)
>     else
>       super
>     end
>   end

I wonder (and would like opinions on) whether there is any hidden
trouble, beyond synchronization issues, in the otherwise useful idea
to go from a FileDescription object to a FileHandle object.  With a
FileHandle, things like the following could be possible:



log = FileHandle.new('/home/joe', 'program.log')

log.location		=> "/home/joe"
log.name		=> "program.log"
log.path		=> "/home/joe/program.log"

log.location = '/home/joe/subdir'

log.location		=> "/home/joe"
log.commit		=> true
log.location		=> "/home/joe/subdir"

log.path = '/home/joe/otherdir/othername'
log.commit		=> true

log.location		=> "/home/joe/otherdir"
log.name		=> "othername"

log.location = '/file_in_root_dir'
log.commit		=> false

log.location		=> "/home/joe/otherdir"



Massimiliano