From: Brian Green <gallagherjb@...>
Date: 2008-09-05T10:51:28+09:00
Subject: How do I quickly search the end of a huge text file?

I am trying to create a ruby script that will search a maya ascii file
for specific text. The problem I'm running into is that it's running to
slow for the system at work. I know that all the information I need is
in the last 5% of the text file - but I haven't been able to figure out
a way to either jump to near the end, and then start search through
lines or even better iterating backwards through the file till I find
what I'm looking for... here is the code I'm currently using - which
works but slowly - any suggestions for how to speed this up would be
greatly appreciated! :D

require "FileUtils"
require "ftools"

def FindRenderLayers (root)
layersFile = []
dirLocation = root.gsub(/(\\)$/, '')
list = Dir.entries(dirLocation)

  list.each do |file|
    if file =~ /\.ma$/
       fileName = root + file
       layersFile.push file
       File.open(fileName) do |file|
        while line = file.gets
          if line =~ /connectAttr
(\"renderLayerManager.rlmi\[[0-9]\]\")/
            if $1 != "defaultRenderLayer"
              editedLine = "-" + $1
              layersFile.push editedLine
            end
          end
        end
      end
    end
  end
  return layersFile
end

root = "C:\\Users\\Brian\\Documents\\Ruby\\"
puts FindRenderLayers(root)
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