From: "Brian Schröder" <ruby@...>
Date: 2004-10-12T17:39:20+09:00
Subject: Re: How to get and compare file lists in directory?

nkb wrote:
> Hi.
> 
> I've a directory with a long list of files (e.g. *.rb, *.txt, etc.). All 
> my ruby files are named like 00001.rb, 00002.rb up to 05000.rb or so. 
> What I am really interested is to get the ruby file list and compare it 
> with an existing list. And if this new list has additional files, I 
> would invoke another program with just the integer part of the file as 
> the arugment. (i.e. runmyprogram (5000) instead of runmyprogram (05000.rb))

Please note, that in ruby you have to but the argument list with the 
method call. ie run_my_program(5000).
Also for methods snake case is used, so for better readablity enter "_" 
between the words.

> 
> My ruby knowledge allows me to write up to here:
> directory = Dir
> puts Dir.pwd
> puts Dir.entries(Dir.pwd)
> 
> Could anyone help or point me to how to get set the rest of my 
> requirement? Thanks!!
> 

Warning: Typed directly into the email:

oldfiles = (File.exist?'old_rb_files.lst') ? 
File.open('old_rb_files.lst'){|file|file.read.split("\n")} : []
new_files = Dir['*.rb'] - old_files
new_files.each do | new_file |
   puts "Do something with #{newfile}"
end

File.open('old_rb_files.lst', 'a+') do | file |
   if /(\d+).rb/ =~ file
   run_my_program($1.to_i)
end


regards,

Brian
-- 
Brian Schr�der
http://ruby.brian-schroeder.de/