From: bbense+comp.lang.ruby.Mar.15.02@...
Date: 2002-03-16T06:16:40+09:00
Subject: Re: Some potential RCRs

-----BEGIN PGP SIGNED MESSAGE-----

In article <99DD35F8BFC4D511A3C500508BEE03A23246C0@mail01>,
Morris, Chris <chris.morris@snelling.com> wrote:
>> > - - A much better solution would be added support for file "type"
>> > matching. I.e. give me all the "simple" files in this directory
>> > or give me all the symlinks, or all the subdirs... Something
>> > similar to the kind of knobs that unix find gives you.
>> 
>> Exactly what I was getting at.
>
>Something like ...
>
>  def Dir.files(dirname)
>    result = []
>    Dir.entries(dirname).each do |entry|
>      result << entry if File.stat(dirname + entry).file?
>    end
>    result
>  end
>
>As Guy posted, Dir[dirname + '*'] will do the same, except it includes the
>directory name in each entry.
>
>Maybe these sort of functions would be good additions to ftools.rb?
>

- - I did some more thinking about this and it seems to me that a 
good name would be Dir::slice. Somewhat similar in concept to 
Array::slice. Or perhaps Dir::collect. Hmm, does Dir implement
Emunerable? 

Here's a simple minded implementation. 

# This implements the method 
# Dir::slice(dirname,test, proc ) 
# It returns an array of names that pass the test and 
# if proc is available runs that on them and returns
# that resulting array.  

class Dir
  def Dir.slice (dirname,test)
    result = [] 
    Dir.entries(dirname).each do |entry|
      if test.call(dirname + "/" + entry) then 
        if ( block_given? ) then 
          result << yield(dirname + "/" + entry)
        else 
	  result << entry
	end 
      end 
    end
    result
  end

  def Dir.files (dirname)
    Dir.slice(dirname,Proc.new{ |a| FileTest.file?(a) })
  end
 
end


puts Dir.files( ".")

puts Dir.slice(".", Proc.new{ |a| FileTest.file?(a) }) { |a| a.upcase } 


- - Booker C. Bense 


-----BEGIN PGP SIGNATURE-----
Version: 2.6.2

iQCVAwUBPJJfbwD83u1ILnWNAQFDvwP/QoAphkFS76hYJilRsArWTYjEmBUwaok/
eYSMTkRDdS5qopzmFzs3IucT4EldotccQu+jw5aRiVqr/EjEWQLsaxEGMsWznN2g
50un4dR8xq87bSerQu5zLyC5theyHUbCLw9nxiazdjWx8u2pY+F7kOuC9SwZLDcf
GzjjJpBJA4A=
=9+d1
-----END PGP SIGNATURE-----
--