From: Sam Fent <asbestos999@...>
Date: 2007-03-15T02:27:00+09:00
Subject: Re: Copying files and changing their names

Sam Fent wrote:

> If I wanted to change example2.txt to example-final.txt, and test3.txt 
> to test-final.txt, how could I iterate throught the files to find the 
> file with the highest number?

Ok, so I worked it out myself, as I probably should have from the 
beginning.

This is almost certainly not the most efficient code, in that it 
iterates over the same directories several times, but here it is, in 
case any future person wants to do the same thing (or any present person 
wants to make it more efficient).

require 'find'
require 'fileutils'

usedNames = []

Find.find('.') do |f|
  if (File.file?(f) and f.match(/txt$/))
    name = f[/.*V/][0..-2]
    if (!usedNames.include?(name))
      usedNames += [name]
      versions = []

      # find the latest version number
      Find.find('.') do |f|
        if (File.file?(f) and f.match(/#{name}.*txt$/))
          versionNumber = f[name.length+1..-5]
          versions += [versionNumber]
        end
      end
      versions = versions.sort
      lastVersionNumber = versions[versions.length-1]

      # copy file and re-name it FINAL
      if (!lastVersionNumber.match(/.*FINAL.*/))
        Find.find(name+"V"+lastVersionNumber+".txt") do |g|
          puts "Changing file " + g + " to: " + 
g.sub(/#{lastVersionNumber}/,"_FINAL")
          FileUtils.cp(g,g.sub(/#{lastVersionNumber}/,"FINAL"))

        end
      end
    end
  end
end


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