more changes to make future porting to ARC easier

macosx/Controller.h

@@ -105,7 +105,9 @@ typedef enum
     NSMutableDictionary             * fPendingTorrentDownloads;
     
     NSMutableSet                    * fAddingTransfers;
+    
     NSMutableSet                    * fAddWindows;
+    URLSheetWindowController        * fUrlSheetController;
     
     BOOL                            fGlobalPopoverShown;
     BOOL                            fSoundPlaying;
@@ -128,7 +130,6 @@ typedef enum
 
 - (void) openURL: (NSString *) urlString;
 - (void) openURLShowSheet: (id) sender;
-- (void) urlSheetDidEnd: (URLSheetWindowController *) controller url: (NSString *) urlString returnCode: (NSInteger) returnCode;
 
 - (void) quitSheetDidEnd: (NSWindow *) sheet returnCode: (NSInteger) returnCode contextInfo: (void *) contextInfo;
 

macosx/Controller.m

@@ -752,6 +752,13 @@ static void sleepCallback(void * controller, io_service_t y, natural_t messageTy
     {
         [download cancel];
         
+        [fPendingTorrentDownloads removeObjectForKey: [[download request] URL]];
+        if ([fPendingTorrentDownloads count] == 0)
+        {
+            [fPendingTorrentDownloads release];
+            fPendingTorrentDownloads = nil;
+        }
+        
         NSRunAlertPanel(NSLocalizedString(@"Torrent download failed", "Download not a torrent -> title"),
             [NSString stringWithFormat: NSLocalizedString(@"It appears that the file \"%@\" from %@ is not a torrent file.",
             "Download not a torrent -> message"), suggestedName,
@@ -767,11 +774,7 @@ static void sleepCallback(void * controller, io_service_t y, natural_t messageTy
 
 -(void) download: (NSURLDownload *) download didCreateDestination: (NSString *) path
 {
-    if (!fPendingTorrentDownloads)
-        fPendingTorrentDownloads = [[NSMutableDictionary alloc] init];
-    
-    [fPendingTorrentDownloads setObject: [NSDictionary dictionaryWithObjectsAndKeys:
-                    path, @"Path", download, @"Download", nil] forKey: [[download request] URL]];
+    [(NSMutableDictionary *)[fPendingTorrentDownloads objectForKey: [[download request] URL]] setObject: path forKey: @"Path"];
 }
 
 - (void) download: (NSURLDownload *) download didFailWithError: (NSError *) error
@@ -1203,21 +1206,41 @@ static void sleepCallback(void * controller, io_service_t y, natural_t messageTy
         
         NSURLRequest * request = [NSURLRequest requestWithURL: [NSURL URLWithString: urlString]
                                     cachePolicy: NSURLRequestReloadIgnoringLocalAndRemoteCacheData timeoutInterval: 60];
-        [[NSURLDownload alloc] initWithRequest: request delegate: self];
+        
+        if ([fPendingTorrentDownloads objectForKey: [request URL]])
+        {
+            NSLog(@"Already downloading %@", [request URL]);
+            return;
+        }
+        
+        NSURLDownload * download = [[NSURLDownload alloc] initWithRequest: request delegate: self];
+        
+        if (!fPendingTorrentDownloads)
+            fPendingTorrentDownloads = [[NSMutableDictionary alloc] init];
+        [fPendingTorrentDownloads setObject: [NSMutableDictionary dictionaryWithObject: download forKey: @"Download"] forKey: [request URL]];
     }
 }
 
 - (void) openURLShowSheet: (id) sender
 {
-    [[[URLSheetWindowController alloc] initWithController: self] beginSheetForWindow: fWindow];
+    if (!fUrlSheetController)
+    {
+        fUrlSheetController = [[URLSheetWindowController alloc] initWithController: self];
+    
+        [NSApp beginSheet: [fUrlSheetController window] modalForWindow: fWindow modalDelegate: self didEndSelector: @selector(urlSheetDidEnd:returnCode:contextInfo:) contextInfo: nil];
+    }
 }
 
-- (void) urlSheetDidEnd: (URLSheetWindowController *) controller url: (NSString *) urlString returnCode: (NSInteger) returnCode
+- (void) urlSheetDidEnd: (NSWindow *) sheet returnCode: (NSInteger) returnCode contextInfo: (void *) contextInfo
 {
     if (returnCode == 1)
+    {
+        NSString * urlString = [fUrlSheetController urlString];
         [self performSelectorOnMainThread: @selector(openURL:) withObject: urlString waitUntilDone: NO];
+    }
     
-    [controller release];
+    [fUrlSheetController release];
+    fUrlSheetController = nil;
 }
 
 - (void) createFile: (id) sender

macosx/URLSheetWindowController.h

@@ -36,9 +36,10 @@
 }
 
 - (id) initWithController: (Controller *) controller;
-- (void) beginSheetForWindow: (NSWindow *) window;
 
 - (void) openURLEndSheet: (id) sender;
 - (void) openURLCancelEndSheet: (id) sender;
 
+- (NSString *) urlString;
+
 @end

macosx/URLSheetWindowController.m

@@ -80,12 +80,6 @@ NSString * urlString = nil;
     [fCancelButton setFrame: cancelFrame];
 }
 
-- (IBAction) beginSheetForWindow: (NSWindow *) window
-{
-    [NSApp beginSheet: [self window] modalForWindow: window modalDelegate: self
-        didEndSelector: @selector(sheetDidEnd:returnCode:contextInfo:) contextInfo: nil];
-}
-
 - (void) openURLEndSheet: (id) sender
 {
     [[self window] orderOut: sender];
@@ -98,11 +92,9 @@ NSString * urlString = nil;
     [NSApp endSheet: [self window] returnCode: 0];
 }
 
-- (void) sheetDidEnd: (NSWindow *) sheet returnCode: (NSInteger) returnCode contextInfo: (void *) contextInfo
+- (NSString *) urlString
 {
-    [urlString release];
-    urlString = [[fTextField stringValue] retain];
-    [fController urlSheetDidEnd: self url: urlString returnCode: returnCode];
+    return [[[fTextField stringValue] retain] autorelease];
 }
 
 - (void) controlTextDidChange: (NSNotification *) notification