Rakefile in googlecharts-1.3.1 vs Rakefile in googlecharts-1.3.4

@@ -1,4 +1,32 @@
 require 'config/requirements'
 require 'config/hoe' # setup Hoe + all gem configuration
 
-Dir['tasks/**/*.rake'].each { |rake| load rake }
+Dir['tasks/**/*.rake'].each { |rake| load rake }
+
+desc %{Update ".manifest" with the latest list of project filenames. Respect\
+.gitignore by excluding everything that git ignores. Update `files` and\
+`test_files` arrays in "*.gemspec" file if it's present.}
+task :manifest do
+  list = Dir['**/*'].sort
+  spec_file = Dir['*.gemspec'].first
+  list -= [spec_file] if spec_file
+  
+  File.read('.gitignore').each_line do |glob|
+    glob = glob.chomp.sub(/^\//, '')
+    list -= Dir[glob]
+    list -= Dir["#{glob}/**/*"] if File.directory?(glob) and !File.symlink?(glob)
+    puts "excluding #{glob}"
+  end
+ 
+  if spec_file
+    spec = File.read spec_file
+    spec.gsub! /^(\s* s.(test_)?files \s* = \s* )( \[ [^\]]* \] | %w\( [^)]* \) )/mx do
+      assignment = $1
+      bunch = $2 ? list.grep(/^test\//) : list
+      '%s%%w(%s)' % [assignment, bunch.join(' ')]
+    end
+      
+    File.open(spec_file, 'w') {|f| f << spec }
+  end
+  File.open('.manifest', 'w') {|f| f << list.join("\n") }
+end
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