A ruby script for whitespace clean-up

whitespace.rb

#!/usr/bin/env ruby

# Take a file_name
# If there are any "bad" lines:
# => Print out the file name
# => Print out the offending line numbers
# => Overwrite the file with "good" lines
# You might want to make sure *everything* is in source control first
# It's "good form" to have mass white-space clean-up be a single check-in, too
def clean_whitespace(file_name)
  lines = []
  File.open(file_name) do |file|
    file.each_line do |line|
      lines << line
    end
  end

  clean = true
  lines.each_index do |index|
    line = lines[index]
    #match one or more spaces/tabs at the end of the line -> nothing
    new_line = line.gsub(/[ \t]+$/, "")
    #match all tabs and replace with two spaces
    new_line = new_line.gsub(/\t/, "  ")

    if(new_line != line)

      if(clean)
        puts "Cleaning '#{file_name}'"
        clean = false
      end

      puts "#{index+1}"

      lines[index] = new_line
    end
  end

  if(!clean)
    File.open(file_name, 'w') do |file|
      lines.each { |line| file.write(line) }
    end
  end
end

# All as, mxml, rb, sass, and haml files in this and all subdirectories
source_files_pattern = File.join("**", "{*.{as,mxml,rb,sass,haml},Rakefile}")
# create an array of all files that patch the above file pattern
source_files = Dir.glob(source_files_pattern)
# Exclude files in a a directory -> /site/vendor
source_files = source_files.select { |file| !(file =~ /site\/vendor\/.*/) }

source_files.each { |file| clean_whitespace(file) }