Disable Reader View

This commit:
- adds a `isFeedProvider: Bool` property to `WebFeed`
- if `isFeedProvider` is `true`, the article extractor is disabled on the inspector, hidden from the context menu, and the toolbar button is disabled. Additionally, if `isFeedProvider` is `true`, `isArticleExtractorAlwaysOn` returns `false` and cannot be set to `true`.

Account/Sources/Account/WebFeed.swift

@@ -152,9 +152,14 @@ public final class WebFeed: Feed, Renamable, Hashable {
 	
 	public var isArticleExtractorAlwaysOn: Bool? {
 		get {
+            if isFeedProvider == true { return false } // not an option for FeedProviders
 			return metadata.isArticleExtractorAlwaysOn
 		}
 		set {
+            if isFeedProvider == true {
+                metadata.isArticleExtractorAlwaysOn = false
+                return
+            }
 			metadata.isArticleExtractorAlwaysOn = newValue
 		}
 	}
@@ -220,6 +225,16 @@ public final class WebFeed: Feed, Renamable, Hashable {
 			postUnreadCountDidChangeNotification()
 		}
 	}
+    
+    // MARK: - Feed Provider
+    public var isFeedProvider: Bool {
+        get {            
+            if FeedProviderManager.shared.best(for: URLComponents(url: URL(string: url)!, resolvingAgainstBaseURL: false)!) == nil {
+                return false
+            }
+            return true
+        }
+    }
 
 	var metadata: WebFeedMetadata
 

Mac/Inspector/WebFeedInspectorViewController.swift

@@ -140,6 +140,9 @@ private extension WebFeedInspectorViewController {
 		updateIsReaderViewAlwaysOn()
 		windowTitle = feed?.nameForDisplay ?? NSLocalizedString("Feed Inspector", comment: "Feed Inspector window title")
 		view.needsLayout = true
+		if let webfeed = feed {
+			webfeed.isFeedProvider ? (isReaderViewAlwaysOnCheckBox?.isEnabled = false) : (isReaderViewAlwaysOnCheckBox?.isEnabled = true)
+		}
 	}
 
 	func updateImage() {

Mac/MainWindow/MainWindowController.swift

@@ -1061,6 +1061,7 @@ private extension MainWindowController {
 			return false
 		}
 		
+
 		if #available(macOS 11.0, *) {
 
 			guard let toolbarItem = item as? NSToolbarItem, let toolbarButton = toolbarItem.view as? ArticleExtractorButton else {
@@ -1069,6 +1070,15 @@ private extension MainWindowController {
 				}
 				return currentLink != nil
 			}
+			
+			if let webfeed = currentTimelineViewController?.selectedArticles.first?.webFeed {
+				if webfeed.isFeedProvider {
+					toolbarButton.isEnabled = false
+					return false
+				} else {
+					toolbarButton.isEnabled = true
+				}
+			}
 
 			guard let state = articleExtractor?.state else {
 				toolbarButton.buttonState = .off
@@ -1093,6 +1103,15 @@ private extension MainWindowController {
 				return currentLink != nil
 			}
 			
+			if let webfeed = currentTimelineViewController?.selectedArticles.first?.webFeed {
+				if webfeed.isFeedProvider {
+					toolbarButton.isEnabled = false
+					return false
+				} else {
+					toolbarButton.isEnabled = true
+				}
+			}
+			
 			toolbarButton.state = isShowingExtractedArticle ? .on : .off
 
 			guard let state = articleExtractor?.state else {

Mac/MainWindow/Sidebar/SidebarViewController+ContextualMenus.swift

@@ -240,15 +240,20 @@ private extension SidebarViewController {
 		}
 		menu.addItem(notificationMenuItem)
 		
-		let articleExtractorText = NSLocalizedString("Always Use Reader View", comment: "Always Use Reader View")
-		let articleExtractorMenuItem = menuItem(articleExtractorText, #selector(toggleArticleExtractorFromContextMenu(_:)), webFeed)
 		
-		if webFeed.isArticleExtractorAlwaysOn == nil || webFeed.isArticleExtractorAlwaysOn! == false {
-			articleExtractorMenuItem.state = .off
-		} else {
-			articleExtractorMenuItem.state = .on
+		if !webFeed.isFeedProvider {
+			let articleExtractorText = NSLocalizedString("Always Use Reader View", comment: "Always Use Reader View")
+			let articleExtractorMenuItem = menuItem(articleExtractorText, #selector(toggleArticleExtractorFromContextMenu(_:)), webFeed)
+			
+			if webFeed.isArticleExtractorAlwaysOn == nil || webFeed.isArticleExtractorAlwaysOn! == false {
+				articleExtractorMenuItem.state = .off
+			} else {
+				articleExtractorMenuItem.state = .on
+			}
+			menu.addItem(articleExtractorMenuItem)
 		}
-		menu.addItem(articleExtractorMenuItem)
+		
+		
 		menu.addItem(NSMenuItem.separator())
 		
 		menu.addItem(renameMenuItem(webFeed))