Freeze in rails 2.0.2 (Am I going to regret having this beast in CVS?)

2 files changed, 228 insertions, 0 deletions

diff --git a/vendor/rails-2.0.2/railties/lib/rails/plugin/loader.rb b/vendor/rails-2.0.2/railties/lib/rails/plugin/loader.rb
new file mode 100644
index 000000000..438afa4d3
--- /dev/null
+++ b/vendor/rails-2.0.2/railties/lib/rails/plugin/loader.rb
@@ -0,0 +1,150 @@
+require "rails/plugin"
+
+module Rails
+  class Plugin
+    class Loader
+      attr_reader :initializer
+
+      # Creates a new Plugin::Loader instance, associated with the given
+      # Rails::Initializer. This default implementation automatically locates
+      # all plugins, and adds all plugin load paths, when it is created. The plugins
+      # are then fully loaded (init.rb is evaluated) when load_plugins is called.
+      #
+      # It is the loader's responsibility to ensure that only the plugins specified
+      # in the configuration are actually loaded, and that the order defined
+      # is respected.
+      def initialize(initializer)
+        @initializer = initializer
+      end
+      
+      # Returns the plugins to be loaded, in the order they should be loaded.
+      def plugins
+        @plugins ||= all_plugins.select { |plugin| should_load?(plugin) }.sort { |p1, p2| order_plugins(p1, p2) }
+      end
+
+      # Returns all the plugins that could be found by the current locators.
+      def all_plugins
+        @all_plugins ||= locate_plugins
+        @all_plugins
+      end
+    
+      def load_plugins
+        plugins.each do |plugin| 
+          plugin.load(initializer)
+          register_plugin_as_loaded(plugin)
+        end
+        ensure_all_registered_plugins_are_loaded!
+      end
+      
+      # Adds the load paths for every plugin into the $LOAD_PATH. Plugin load paths are
+      # added *after* the application's <tt>lib</tt> directory, to ensure that an application
+      # can always override code within a plugin.
+      #
+      # Plugin load paths are also added to Dependencies.load_paths, and Dependencies.load_once_paths.  
+      def add_plugin_load_paths
+        plugins.each do |plugin|
+          plugin.load_paths.each do |path|
+            $LOAD_PATH.insert(application_lib_index + 1, path)
+            Dependencies.load_paths      << path
+            Dependencies.load_once_paths << path
+          end
+        end
+        $LOAD_PATH.uniq!
+      end      
+      
+      protected
+      
+        # The locate_plugins method uses each class in config.plugin_locators to
+        # find the set of all plugins available to this Rails application.
+        def locate_plugins
+          configuration.plugin_locators.map { |locator|
+            locator.new(initializer).plugins
+          }.flatten
+          # TODO: sorting based on config.plugins
+        end
+
+        def register_plugin_as_loaded(plugin)
+          initializer.loaded_plugins << plugin
+        end
+
+        def configuration
+          initializer.configuration
+        end
+        
+        def should_load?(plugin)
+          # uses Plugin#name and Plugin#valid?
+          enabled?(plugin) && plugin.valid?
+        end
+
+        def order_plugins(plugin_a, plugin_b)
+          if !explicit_plugin_loading_order?
+            plugin_a <=> plugin_b
+          else
+            if !explicitly_enabled?(plugin_a) && !explicitly_enabled?(plugin_b)
+              plugin_a <=> plugin_b
+            else
+              effective_order_of(plugin_a) <=> effective_order_of(plugin_b)
+            end            
+          end
+        end
+        
+        def effective_order_of(plugin)
+          if explicitly_enabled?(plugin)
+            registered_plugin_names.index(plugin.name) 
+          else
+            registered_plugin_names.index('all')
+          end        
+        end
+
+        def application_lib_index
+          $LOAD_PATH.index(File.join(RAILS_ROOT, 'lib')) || 0
+        end      
+
+        def enabled?(plugin)
+          !explicit_plugin_loading_order? || registered?(plugin)
+        end
+
+        def explicit_plugin_loading_order?
+          !registered_plugin_names.nil?
+        end
+
+        def registered?(plugin)
+          explicit_plugin_loading_order? && registered_plugins_names_plugin?(plugin)
+        end
+
+        def explicitly_enabled?(plugin)
+          !explicit_plugin_loading_order? || explicitly_registered?(plugin)
+        end
+
+        def explicitly_registered?(plugin)
+          explicit_plugin_loading_order? && registered_plugin_names.include?(plugin.name)
+        end
+      
+        def registered_plugins_names_plugin?(plugin)
+          registered_plugin_names.include?(plugin.name) || registered_plugin_names.include?('all')
+        end
+        
+        # The plugins that have been explicitly listed with config.plugins. If this list is nil
+        # then it means the client does not care which plugins or in what order they are loaded, 
+        # so we load all in alphabetical order. If it is an empty array, we load no plugins, if it is
+        # non empty, we load the named plugins in the order specified.
+        def registered_plugin_names
+          configuration.plugins ? configuration.plugins.map(&:to_s) : nil
+        end
+        
+        def loaded?(plugin_name)
+          initializer.loaded_plugins.detect { |plugin| plugin.name == plugin_name.to_s }
+        end
+        
+        def ensure_all_registered_plugins_are_loaded!
+          if explicit_plugin_loading_order?
+            if configuration.plugins.detect {|plugin| plugin != :all && !loaded?(plugin) }
+              missing_plugins = configuration.plugins - (plugins + [:all])
+              raise LoadError, "Could not locate the following plugins: #{missing_plugins.to_sentence}"
+            end
+          end
+        end
+  
+    end
+  end
+end
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diff --git a/vendor/rails-2.0.2/railties/lib/rails/plugin/locator.rb b/vendor/rails-2.0.2/railties/lib/rails/plugin/locator.rb
new file mode 100644
index 000000000..b27e904b1
--- /dev/null
+++ b/vendor/rails-2.0.2/railties/lib/rails/plugin/locator.rb
@@ -0,0 +1,78 @@
+module Rails
+  class Plugin
+    
+    # The Plugin::Locator class should be subclasses to provide custom plugin-finding
+    # abilities to Rails (i.e. loading plugins from Gems, etc). Each subclass should implement
+    # the <tt>located_plugins</tt> method, which return an array of Plugin objects that have been found.
+    class Locator
+      include Enumerable
+      
+      attr_reader :initializer
+      
+      def initialize(initializer)
+        @initializer = initializer
+      end
+      
+      # This method should return all the plugins which this Plugin::Locator can find
+      # These will then be used by the current Plugin::Loader, which is responsible for actually
+      # loading the plugins themselves
+      def plugins
+        raise "The `plugins' method must be defined by concrete subclasses of #{self.class}"
+      end
+      
+      def each(&block)
+        plugins.each(&block)
+      end
+      
+      def plugin_names
+        plugins.map(&:name)
+      end
+    end
+    
+    # The Rails::Plugin::FileSystemLocator will try to locate plugins by examining the directories
+    # the the paths given in configuration.plugin_paths. Any plugins that can be found are returned
+    # in a list. 
+    #
+    # The criteria for a valid plugin in this case is found in Rails::Plugin#valid?, although
+    # other subclasses of Rails::Plugin::Locator can of course use different conditions.
+    class FileSystemLocator < Locator
+      
+      # Returns all the plugins which can be loaded in the filesystem, under the paths given
+      # by configuration.plugin_paths.
+      def plugins
+        initializer.configuration.plugin_paths.flatten.inject([]) do |plugins, path|
+          plugins.concat locate_plugins_under(path)
+          plugins
+        end.flatten
+      end
+          
+      private
+      
+        # Attempts to create a plugin from the given path. If the created plugin is valid?
+        # (see Rails::Plugin#valid?) then the plugin instance is returned; otherwise nil.
+        def create_plugin(path)
+          plugin = Rails::Plugin.new(path)
+          plugin.valid? ? plugin : nil
+        end
+
+        # This starts at the base path looking for valid plugins (see Rails::Plugin#valid?).
+        # Since plugins can be nested arbitrarily deep within an unspecified number of intermediary 
+        # directories, this method runs recursively until it finds a plugin directory, e.g.
+        #
+        #     locate_plugins_under('vendor/plugins/acts/acts_as_chunky_bacon')
+        #     => <Rails::Plugin name: 'acts_as_chunky_bacon' ... >
+        #
+        def locate_plugins_under(base_path)
+           Dir.glob(File.join(base_path, '*')).inject([]) do |plugins, path|
+            if plugin = create_plugin(path)
+              plugins << plugin
+            elsif File.directory?(path)
+              plugins.concat locate_plugins_under(path)
+            end
+            plugins
+          end
+        end
+        
+    end
+  end
+end
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