rake tasks to fix whitespace

source.rake

def find_and_replace_in_source_files(find, replace)
  extensions = %w[.rhtml .rxml .erb .builder .rb .css .js .rake]
  files = Dir["**/*"]

  files.each do |file_name|
    next if (file_name =~ /^vendor/) || !extensions.include?(File.extname(file_name))
    text = File.open(file_name, 'r'){ |file| file.read }
    changed = text.gsub!(find, replace)
    File.open(file_name, 'w'){|file| file.write(changed)} if changed
  end
end

namespace :source do

  desc "Replace all tabs in source code files with two spaces"
  task :detab do
    find_and_replace_in_source_files("\t", "  ")
  end

  desc "Remove trailing whitespace on the ends of lines"
  task :detrail do
    find_and_replace_in_source_files(/ +$/, '')
  end

end