Made revert work.

English.lproj/PassengerPref.xib

@@ -8,7 +8,7 @@
 		<string key="IBDocument.HIToolboxVersion">352.00</string>
 		<object class="NSMutableArray" key="IBDocument.EditedObjectIDs">
 			<bool key="EncodedWithXMLCoder">YES</bool>
-			<integer value="230"/>
+			<integer value="6"/>
 		</object>
 		<object class="NSArray" key="IBDocument.PluginDependencies">
 			<bool key="EncodedWithXMLCoder">YES</bool>
@@ -1366,6 +1366,26 @@ dHRwOi8vd3d3Lm1vZHJhaWxzLmNvbSBmb3IgaW5zdGFsbGF0aW9uIGluc3RydWN0aW9ucy4</string>
 					</object>
 					<int key="connectionID">375</int>
 				</object>
+				<object class="IBConnectionRecord">
+					<object class="IBBindingConnection" key="connection">
+						<string key="label">target: selection</string>
+						<reference key="source" ref="615078570"/>
+						<reference key="destination" ref="467003467"/>
+						<object class="NSNibBindingConnector" key="connector">
+							<reference key="NSSource" ref="615078570"/>
+							<reference key="NSDestination" ref="467003467"/>
+							<string key="NSLabel">target: selection</string>
+							<string key="NSBinding">target</string>
+							<string key="NSKeyPath">selection</string>
+							<object class="NSDictionary" key="NSOptions">
+								<string key="NS.key.0">NSSelectorName</string>
+								<string key="NS.object.0">revert</string>
+							</object>
+							<int key="NSNibBindingConnectorVersion">2</int>
+						</object>
+					</object>
+					<int key="connectionID">377</int>
+				</object>
 			</object>
 			<object class="IBMutableOrderedSet" key="objectRecords">
 				<object class="NSArray" key="orderedObjects">
@@ -2004,7 +2024,7 @@ dHRwOi8vd3d3Lm1vZHJhaWxzLmNvbSBmb3IgaW5zdGFsbGF0aW9uIGluc3RydWN0aW9ucy4</string>
 				</object>
 			</object>
 			<nil key="sourceID"/>
-			<int key="maxID">375</int>
+			<int key="maxID">377</int>
 		</object>
 		<object class="IBClassDescriber" key="IBDocument.Classes">
 			<object class="NSMutableArray" key="referencedPartialClassDescriptions">

PassengerApplication.rb

@@ -41,6 +41,8 @@ def init
       @new_app = true
       @dirty = @valid = false
       @host, @path = '', ''
+
+      @original_values = { 'host' => @host, 'path' => @path, 'environment' => @environment, 'allow_mod_rewrite' => @allow_mod_rewrite }
       self
     end
   end
@@ -54,6 +56,8 @@ def initWithFile(file)
       @path = data.match(/DocumentRoot\s+"(.+)\/public"\n/)[1]
       @environment = (data.match(/RailsEnv\s+(development|production)\n/)[1] == 'development' ? DEVELOPMENT : PRODUCTION)
       @allow_mod_rewrite = (data.match(/RailsAllowModRewrite\s+(off|on)\n/)[1] == 'on')
+
+      @original_values = { 'host' => @host, 'path' => @path, 'environment' => @environment, 'allow_mod_rewrite' => @allow_mod_rewrite }
       self
     end
   end
@@ -63,6 +67,8 @@ def initWithPath(path)
       @dirty = true
       @path = path
       set_default_host_from_path(path)
+
+      @original_values = { 'host' => @host, 'path' => @path, 'environment' => @environment, 'allow_mod_rewrite' => @allow_mod_rewrite }
       self
     end
   end
@@ -75,6 +81,10 @@ def dirty?
     @dirty
   end
 
+  def valid?
+    @valid
+  end
+
   def apply(sender = nil)
     p "apply"
     @new_app ? start : restart
@@ -119,6 +129,13 @@ def to_hash
     }
   end
 
+  def revert(sender = nil)
+    @original_values.each do |key, value|
+      send "#{key}=", value
+    end
+    self.valid = self.dirty = false
+  end
+
   private
 
   def set_default_host_from_path(path)

test/passenger_application_test.rb

@@ -1,6 +1,14 @@
 require File.expand_path('../test_helper', __FILE__)
 require 'PassengerApplication'
 
+class Hash
+  def except(key)
+    copy = dup
+    copy.delete(key)
+    copy
+  end
+end
+
 describe "PassengerApplication, with a new application" do
   tests PassengerApplication
 
@@ -95,8 +103,6 @@ def after_setup
   end
 
   it "should mark the application as dirty if a value has changed" do
-    passenger_app.stubs(:restart)
-
     assigns(:dirty).should.be false
     passenger_app.setValue_forKey('het-manfreds-blog.local', 'host')
     assigns(:dirty).should.be true
@@ -169,4 +175,21 @@ def after_setup
 
     PassengerApplication.startApplications [app1, app2].to_ns
   end
+
+  it "should remember all the original values for the case that the user wants to revert" do
+    passenger_app.setValue_forKey('foo.local', 'host')
+    passenger_app.setValue_forKey('/some/path', 'path')
+    passenger_app.setValue_forKey('production', 'environment')
+    passenger_app.setValue_forKey(true, 'allow_mod_rewrite')
+
+    passenger_app.should.be.dirty
+    passenger_app.should.be.valid
+    passenger_app.to_hash.except('config_path').should == { 'host' => 'foo.local', 'path' => '/some/path', 'environment' => 'production', 'allow_mod_rewrite' => true }
+
+    passenger_app.revert
+
+    passenger_app.should.not.be.dirty
+    passenger_app.should.not.be.valid
+    passenger_app.to_hash.except('config_path').should == { 'host' => 'het-manfreds-blog.local', 'path' => '/Users/het-manfred/rails code/blog', 'environment' => 'development', 'allow_mod_rewrite' => false }
+  end
 end