Auto update feeds. Menu rebuild so far only after close.

baRSS/Preferences/FeedConfig+Ext.h

@@ -42,8 +42,11 @@ typedef BOOL (^FeedConfigRecursiveItemsBlock) (FeedConfig *parent, FeedItem *ite
 
 @property (getter=typ, setter=setTyp:) FeedConfigType typ;
 @property (readonly) NSArray<FeedConfig*> *sortedChildren;
+@property (readonly) NSIndexPath *indexPath;
 
 - (BOOL)descendantFeedItems:(FeedConfigRecursiveItemsBlock)block;
+- (void)calculateAndSetScheduled;
+- (void)mergeChangesAndSave;
 - (NSString*)readableRefreshString;
 - (NSString*)readableDescription;
 @end

baRSS/Preferences/FeedConfig+Ext.m

@@ -40,6 +40,12 @@
 	return [self.children sortedArrayUsingDescriptors:@[[NSSortDescriptor sortDescriptorWithKey:@"sortIndex" ascending:YES]]];
 }
 
+- (NSIndexPath *)indexPath {
+	if (self.parent == nil)
+		return [NSIndexPath indexPathWithIndex:(NSUInteger)self.sortIndex];
+	return [self.parent.indexPath indexPathByAddingIndex:(NSUInteger)self.sortIndex];
+}
+
 /**
  Iterate over all descendant @c FeedItems in sub groups
  
@@ -61,6 +67,25 @@
 	return YES;
 }
 
+/// @return Time interval respecting the selected unit. E.g., returns @c 180 for @c '3m'
+- (NSTimeInterval)timeInterval {
+	static const int unit[] = {1, 60, 3600, 86400, 604800}; // smhdw
+	return self.refreshNum * unit[self.refreshUnit % 5];
+}
+
+/// Calculate date from @c refreshNum and @c refreshUnit and set as next scheduled feed update.
+- (void)calculateAndSetScheduled {
+	self.scheduled = [[NSDate date] dateByAddingTimeInterval:[self timeInterval]];
+}
+
+/// Update item with @c mergeChanges:YES and save the context
+- (void)mergeChangesAndSave {
+	[self.managedObjectContext performBlockAndWait:^{
+		[self.managedObjectContext refreshObject:self mergeChanges:YES];
+		[self.managedObjectContext save:nil];
+	}];
+}
+
 /// @return Formatted string for update interval ( e.g., @c 30m or @c 12h )
 - (NSString*)readableRefreshString {
 	return [NSString stringWithFormat:@"%d%c", self.refreshNum, [@"smhdw" characterAtIndex:self.refreshUnit % 5]];

baRSS/Preferences/Feeds Tab/ModalFeedEdit.m

@@ -35,6 +35,8 @@
 @property (weak) IBOutlet NSPopover *warningPopover;
 
 @property (copy) NSString *previousURL;
+@property (copy) NSString *httpDate;
+@property (copy) NSString *httpEtag;
 @property (strong) NSError *feedError;
 @property (strong) RSParsedFeed *feedResult;
 
@@ -107,15 +109,19 @@
 		item.refreshUnit = (int16_t)self.refreshUnit.indexOfSelectedItem;
 	
 	if (self.shouldDeletePrevArticles) {
+		[StoreCoordinator overwriteConfig:item withFeed:self.feedResult];
 		[item.managedObjectContext performBlockAndWait:^{
-			if (item.feed)
-				[item.managedObjectContext deleteObject:(NSManagedObject*)item.feed];
-			if (self.feedResult)
-				item.feed = [StoreCoordinator createFeedFrom:self.feedResult inContext:item.managedObjectContext];
+			// TODO: move to separate function and add icon download
+			if (!item.meta) {
+				item.meta = [[FeedMeta alloc] initWithEntity:FeedMeta.entity insertIntoManagedObjectContext:item.managedObjectContext];
+			}
+			item.meta.httpEtag = self.httpEtag;
+			item.meta.httpModified = self.httpDate;
 		}];
 	}
 	if ([item.managedObjectContext hasChanges]) {
 		self.objectIsModified = YES;
+		[item calculateAndSetScheduled];
 		[item.managedObjectContext performBlockAndWait:^{
 			[item.managedObjectContext refreshObject:item mergeChanges:YES];
 		}];
@@ -146,11 +152,16 @@
 		self.feedError = nil;
 		[self.spinnerURL startAnimation:nil];
 		[self.spinnerName startAnimation:nil];
-		[FeedDownload getFeed:self.previousURL block:^(RSParsedFeed *result, NSError *error, NSHTTPURLResponse* response) {
+		[FeedDownload newFeed:self.previousURL block:^(RSParsedFeed *result, NSError *error, NSHTTPURLResponse* response) {
 			self.feedResult = result;
-//			[httpResponse allHeaderFields][@"Date"]; // @"Expires", @"Last-Modified"
-//			[httpResponse allHeaderFields][@"Etag"];
+			self.httpDate = [response allHeaderFields][@"Date"]; // @"Expires", @"Last-Modified"
+			self.httpEtag = [response allHeaderFields][@"Etag"];
 			dispatch_async(dispatch_get_main_queue(), ^{
+				if (response && ![response.URL.absoluteString isEqualToString:self.url.stringValue]) {
+					// URL was redirected, so replace original text field value with new one
+					self.url.stringValue = response.URL.absoluteString;
+					self.previousURL = self.url.stringValue;
+				}
 				// TODO: play error sound?
 				self.feedError = error; // warning indicator .hidden is bound to feedError
 				self.objectNeedsSaving = YES; // stays YES if this block runs after updateRepresentedObject: