Rake task to strip whitespace

rake_strip_whitespace

require 'extlib/pathname'
require 'zlib'

desc 'Strip whitespace from source files'
task :strip do
  # files and extensions to process
  FILES      = %w[ capfile CHANGELOG LICENSE Manifest MIT-LICENSE README QUICKLINKS README_FOR_APP RUNNING_UNIT_TESTS Rakefile SPECS TODO USAGE .autotest .gitignore .htaccess ].freeze
  EXTENSIONS = %w[ builder cgi conf css deploy erb example fcgi feature gemspec haml htc htm html js key markdown opts php rake ratom rb rcsv rdf rhtml rjs rpdf ru rxml sake sass sh sql thor txt vcf xml yml ].freeze

  paths = Pathname.glob(Rails.root / '*') - [ Rails.root / 'vendor' ]

  paths.each do |path_in|
    start_path = path_in.directory? ? path_in + '**/*' : path_in

    Pathname.glob((start_path).to_s).each do |path|
      unless path.file? && path.size? && path.readable? && path.writable? && (FILES.include?(path.basename.to_s) || EXTENSIONS.include?(path.extname[1..-1]))
#        puts "Skipping #{path}" if path.file?
        next
      end

      # replace leading whitespace (including tabs) with spaces
      # replace trailing whitespace with a newline
      document = path.open('r') do |f|
        f.collect { |line| line.gsub(/\G\s/, ' ').rstrip + "\n" }.join.rstrip
      end + "\n"

      # skip it if the file was not modified
      next if Zlib.crc32(document) == Zlib.crc32(path.read)

      puts "Modifying #{path}"
      path.open('w') { |f| f.write document }
    end
  end
end