Use jeweler for gem management.

Rakefile

@@ -2,7 +2,7 @@ require 'rubygems'
 require 'rake/gempackagetask'
 require 'rake/testtask'
 require 'rake/rdoctask'
- 
+
 task :default => :test
 
 desc "Run All Tests"
@@ -11,32 +11,16 @@ Rake::TestTask.new :test do |test|
   test.verbose = true
 end
 
-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
-
-  if File.exist?('.gitignore')
-    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
-  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 }
+begin
+  require 'jeweler'
+  Jeweler::Tasks.new do |gemspec|
+    gemspec.name = "test_benchmarker"
+    gemspec.summary = "A tool for benchmarking ruby Test::Unit tests."
+    gemspec.email = "myron.marston@gmail.com"
+    gemspec.homepage = "http://github.com/myronmarston/test_benchmarker/"
+    gemspec.description = "A tool for benchmarking ruby Test::Unit tests."
+    gemspec.authors = ["Myron Marston"]
   end
-  File.open('manifest.txt', 'w') {|f| f << list.join("\n") }
+rescue LoadError
+  puts "Jeweler not available. Install it with: sudo gem install technicalpickles-jeweler -s http://gems.github.com"
 end