strip_spaces.rake

#taken and modified from http://github.com/dkubb/dm-dev/tree/master

desc 'Strip trailing whitespace from source files'
task :strip do
  require 'pathname'
  require 'zlib'
 
  # files and extensions to process
  files      = %w[ capfile CHANGELOG MIT-LICENSE README README_FOR_APP RUNNING_UNIT_TESTS Rakefile TODO USAGE .autotest .gitignore ].freeze
  extensions = %w[ builder cgi conf css deploy erb example fcgi haml htc htm html js java key opts php properties rake ratom rb rcsv rdf rhtml rjs rpdf rxml sake sass sh sql txt vcf xml yml ].freeze
 
  Pathname.getwd.find do |path|
    # skip unreadable, unwritable, .git and .svn directories
    Find.prune if (path.directory? && (!path.readable? || !path.writable?)) || %w[ .git .svn ].include?(path.basename.to_s)
 
    # skip non-files, zero-sized files, files not matching specific names, or files without the matching extensions
    next unless path.file? && path.size? && (files.include?(path.basename.to_s) || extensions.include?(path.extname[1..-1]))
 
    # 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 the file if it was not modified
    next if Zlib.crc32(document) == Zlib.crc32(path.read)
 
    puts "Stripping whitepsace from #{path}"
    path.open('w') { |f| f.write document }
  end
end