New: XcodeCapp preference to set maximum recent projects.

Previously the number of recent projects was unbounded, which made the recent menu unwieldy.

Now the recent projects list is pruned to the maximum set in the preferences, which defaults to 20.

Tools/XcodeCapp/XcodeCapp/AppController.m

@@ -100,10 +100,18 @@ AppController *SharedAppControllerInstance = nil;
         kDefaultXCCReactMode: 			@YES,
         kDefaultXCCReopenLastProject: 	@YES,
         kDefaultXCCAutoOpenErrorsPanel:	@YES,
-        kDefaultXCCProjectHistory:		[NSArray new]
+        kDefaultXCCProjectHistory:		[NSArray new],
+        kDefaultMaxRecentProjects:		@20
     };
     
-    [[NSUserDefaults standardUserDefaults] registerDefaults:appDefaults];
+    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
+
+	[defaults registerDefaults:appDefaults];
+
+	[defaults addObserver:self
+               forKeyPath:kDefaultMaxRecentProjects
+                  options:NSKeyValueObservingOptionNew
+                  context:NULL];
 }
 
 - (void)pruneProjectHistory
@@ -118,11 +126,15 @@ AppController *SharedAppControllerInstance = nil;
 			[projectHistory removeObjectAtIndex:i];
     }
 
+    NSInteger maxProjects = [defaults integerForKey:kDefaultMaxRecentProjects];
+
+    if (projectHistory.count > maxProjects)
+        [projectHistory removeObjectsAtIndexes:[NSIndexSet indexSetWithIndexesInRange:NSMakeRange(maxProjects, projectHistory.count - maxProjects)]];
+
     [defaults setObject:projectHistory forKey:kDefaultXCCProjectHistory];
 }
 
-#pragma mark -
-#pragma mark Properties
+#pragma mark - Properties
 
 - (NSImage *)iconActive
 {
@@ -160,8 +172,8 @@ AppController *SharedAppControllerInstance = nil;
     return _menuHistory;
 }
 
-#pragma mark -
-#pragma mark Notification handlers
+
+#pragma mark - Notification handlers
 
 /*!
 	Clean up when the application stops.
@@ -196,9 +208,13 @@ AppController *SharedAppControllerInstance = nil;
     self.menuItemListen.action = @selector(stopListening:);
 }
 
+- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context
+{
+	if ([keyPath isEqualToString:kDefaultMaxRecentProjects])
+        [self pruneProjectHistory];
+}
 
-#pragma mark -
-#pragma mark Utilities
+#pragma mark - Utilities
 
 - (void)updateHistoryMenu
 {
@@ -219,8 +235,7 @@ AppController *SharedAppControllerInstance = nil;
 }
 
 
-#pragma mark -
-#pragma mark Actions
+#pragma mark - Actions
 
 - (IBAction)listenToProject:(id)aSender
 {
@@ -250,6 +265,7 @@ AppController *SharedAppControllerInstance = nil;
     [projectHistory insertObject:path atIndex:0];
 
     [defaults setObject:projectHistory forKey:kDefaultXCCProjectHistory];
+    [self pruneProjectHistory];
     [self updateHistoryMenu];
 
     [self stopListening:self];