Immediately apply the configuration when a new application is dropped.

app/controllers/PassengerPref.m

@@ -44,7 +44,9 @@ - (void) setupAuthorizationView {
 
 - (void) setupApplicationView {
   [self loadApplications];
-  [applicationsController setSelectedObjects:[NSArray arrayWithObjects:[applications objectAtIndex:0], nil]];
+  if ([applications count] > 0) {
+    [applicationsController setSelectedObjects:[NSArray arrayWithObjects:[applications objectAtIndex:0], nil]];
+  }
   [applicationsTableView registerForDraggedTypes:[NSArray arrayWithObject:NSFilenamesPboardType]];
   [applicationsTableView setDraggingSourceOperationMask:NSDragOperationGeneric forLocal:NO];
 }
@@ -100,7 +102,7 @@ - (BOOL) tableView:(NSTableView *)aTableView acceptDrop:(id)info row:(NSInteger)
     [droppedApplications addObject:application];
   }
   [applicationsController addObjects:droppedApplications];
-  [self checkForDirtyApplications];
+  [self apply:self];
 
   return YES;
 }
@@ -147,6 +149,7 @@ - (IBAction) remove:(id)sender {
     [[CLI sharedInstance] delete:application];
   }
   [applicationsController removeObject:application];
+  [self checkForDirtyApplications];
 }
 
 - (IBAction) browse:(id)sender {
@@ -189,6 +192,7 @@ - (IBAction) apply:(id)sender {
   } else {
     NSLog(@"Unable to apply because authorization failed.");
   }
+  [self checkForDirtyApplications];
 }
 - (IBAction) revert:(id)sender {
   Application *application;
@@ -239,7 +243,11 @@ - (void) reloadApplications {
 }
 
 - (Application *) selectedApplication {
-  return [[applicationsController selectedObjects] objectAtIndex:0];
+  if (applications && ([applications count] > 0)) {
+    return [[applicationsController selectedObjects] objectAtIndex:0];
+  } else {
+    return nil;
+  }
 }
 
 - (NSString *) pathForDirectoryBrowser {

app/utils/CLI.m

@@ -30,10 +30,12 @@ - (NSMutableArray *)listApplications {
   result = [self execute:[NSArray arrayWithObjects:@"list", @"-m", nil] elevated:NO];
   applications = [NSMutableArray arrayWithCapacity:[result count]];
 
-  for (attributes in result) {
-    application = [[Application alloc] initWithAttributes:attributes];
-    [application setDelegate:appDelegate];
-    [applications addObject:application];
+  if ([result count] > 0) {
+    for (attributes in result) {
+      application = [[Application alloc] initWithAttributes:attributes];
+      [application setDelegate:appDelegate];
+      [applications addObject:application];
+    }
   }
 
   return applications;

doc/TODO

@@ -1,4 +1,3 @@
-- Immediately apply the configuration when a new application is added. In most cases the default configuration is exactly what you want.
 - Prevent duplicate folders. When the user tries to add a duplicate folder, select the configuration for the application that uses this folder in the source list.
 - Do not accept characters in the Address and Aliases fields that can't be used for the domain name (including whitespace in the address field). 
 - Check for duplicate addresses and aliases after Apply has been clicked. Show a sheet with the following alert: