partial implementation of system rakefiles

lib/rake.rb

@@ -2213,9 +2213,6 @@ def handle_options
 
       options.rakelib = ['rakelib']
 
-      # opts = GetoptLong.new(*command_line_options)
-      # opts.each { |opt, value| do_option(opt, value) }
-
       parsed_argv = nil
       opts = OptionParser.new do |opts|
         opts.banner = "rake [-f rakefile] {options} targets..."
@@ -2277,17 +2274,50 @@ def find_rakefile_location
 
     def raw_load_rakefile # :nodoc:
       rakefile, location = find_rakefile_location
-      @rakefile = rakefile
-      Dir.chdir(location)
-      puts "(in #{Dir.pwd})" unless options.silent
-      $rakefile = @rakefile
-      load File.expand_path(@rakefile) if @rakefile != ''
+      if (! options.ignore_system) && (options.load_system || rakefile.nil?)
+        puts "(in #{Dir.pwd})" unless options.silent
+        puts "NO SYSTEM HERE"
+      else
+        @rakefile = rakefile
+        Dir.chdir(location)
+        puts "(in #{Dir.pwd})" unless options.silent
+        $rakefile = @rakefile
+        load File.expand_path(@rakefile) if @rakefile && @rakefile != ''
+      end
       options.rakelib.each do |rlib|
         Dir["#{rlib}/*.rake"].each do |name| add_import name end
       end
       load_imports
     end
 
+    # The directory path containing the system wide rakefiles.
+    def system_dir
+      if ENV['RAKE_SYSTEM']
+        ENV['RAKE_SYSTEM']
+      elsif windows?
+        win32_system_dir
+      else
+        standard_system_dir
+      end
+    end
+
+    # The standard directory containing system wide rake files.
+    def standard_system_dir #:nodoc:
+      File.join(File.expand_path('~'), '.rake')
+    end
+    private :standard_system_dir
+
+    # The standard directory containing system wide rake files on Win
+    # 32 systems.
+    def win32_system_dir #:nodoc:
+      unless File.exists?(win32home = File.join(ENV['APPDATA'], 'Rake'))
+        raise Win32HomeError, "# Unable to determine home path environment variable."
+      else
+        win32home
+      end
+    end
+    private :win32_system_dir
+
     # Collect the list of tasks on the command line.  If no tasks are
     # given, return a list containing only the default task.
     # Environmental assignments are processed at this time as well.

test/data/sys/sys1.rake

@@ -0,0 +1,3 @@
+task "sys1" do
+  puts "SYS1"
+end

test/test_application.rb

@@ -153,6 +153,20 @@ def test_load_rakefile_not_found
     end
   end
 
+  def test_load_from_system_rakefile
+    in_environment('RAKE_SYSTEM' => 'test/data/sys') do
+      @app.options.rakelib = []
+      @app.instance_eval do
+        handle_options
+        options.silent = true
+        options.load_system = true
+        load_rakefile
+      end
+      assert_equal "test/data/sys", @app.system_dir
+      assert_nil @app.rakefile
+    end
+  end
+
   def test_loading_imports
     mock = flexmock("loader")
     mock.should_receive(:load).with("x.dummy").once