Add the ability to import themes on iOS

iOS/SceneCoordinator.swift

@@ -1282,6 +1282,72 @@ class SceneCoordinator: NSObject, UndoableCommandRunner, UnreadCountProvider {
 			self.selectArticle(article)
 		}
 	}
+	
+	func importTheme(filename: String) {
+		let theme = ArticleTheme(path: filename)
+		
+		let localizedTitleText = NSLocalizedString("Install theme “%@” by %@?", comment: "Theme message text")
+		let title = NSString.localizedStringWithFormat(localizedTitleText as NSString, theme.name, theme.creatorName) as String
+
+		let localizedMessageText = NSLocalizedString("Author's Website:\n%@", comment: "Authors website")
+		let message = NSString.localizedStringWithFormat(localizedMessageText as NSString, theme.creatorHomePage) as String
+
+		let alertController = UIAlertController(title: title, message: message, preferredStyle: .alert)
+		
+		let cancelTitle = NSLocalizedString("Cancel", comment: "Cancel")
+		alertController.addAction(UIAlertAction(title: cancelTitle, style: .cancel))
+		
+		if let url = URL(string: theme.creatorHomePage) {
+			let visitSiteTitle = NSLocalizedString("Show Website", comment: "Show Website")
+			let visitSiteAction = UIAlertAction(title: visitSiteTitle, style: .default) { [weak self] action in
+				UIApplication.shared.open(url)
+				self?.importTheme(filename: filename)
+			}
+			alertController.addAction(visitSiteAction)
+		}
+
+		func importTheme() {
+			do {
+				try ArticleThemesManager.shared.importTheme(filename: filename)
+				confirmImportSuccess(themeName: theme.name)
+			} catch {
+				rootSplitViewController.presentError(error)
+			}
+		}
+
+		let installThemeTitle = NSLocalizedString("Install Theme", comment: "Install Theme")
+		let installThemeAction = UIAlertAction(title: installThemeTitle, style: .default) { [weak self] action in
+
+			if ArticleThemesManager.shared.themeExists(filename: filename) {
+				let title = NSLocalizedString("Duplicate Theme", comment: "Duplicate Theme")
+				let localizedMessageText = NSLocalizedString("The theme “%@” already exists. Overwrite it?", comment: "Overwrite theme")
+				let message = NSString.localizedStringWithFormat(localizedMessageText as NSString, theme.name) as String
+
+				let alertController = UIAlertController(title: title, message: message, preferredStyle: .alert)
+
+				let cancelTitle = NSLocalizedString("Cancel", comment: "Cancel")
+				alertController.addAction(UIAlertAction(title: cancelTitle, style: .cancel))
+
+				let overwriteAction = UIAlertAction(title: NSLocalizedString("Overwrite", comment: "Overwrite"), style: .default) { action in
+					importTheme()
+				}
+				alertController.addAction(overwriteAction)
+				alertController.preferredAction = overwriteAction
+
+				self?.rootSplitViewController.present(alertController, animated: true)
+			} else {
+				importTheme()
+			}
+			
+		}
+		
+		alertController.addAction(installThemeAction)
+		alertController.preferredAction = installThemeAction
+
+		rootSplitViewController.present(alertController, animated: true)
+
+	}
+	
 }
 
 // MARK: UISplitViewControllerDelegate
@@ -2296,4 +2362,18 @@ private extension SceneCoordinator {
 		return false
 	}
 	
+	func confirmImportSuccess(themeName: String) {
+		let title = NSLocalizedString("Theme installed", comment: "Theme installed")
+		
+		let localizedMessageText = NSLocalizedString("The theme “%@” has been installed.", comment: "Theme installed")
+		let message = NSString.localizedStringWithFormat(localizedMessageText as NSString, themeName) as String
+
+		let alertController = UIAlertController(title: title, message: message, preferredStyle: .alert)
+		
+		let cancelTitle = NSLocalizedString("Done", comment: "Done")
+		alertController.addAction(UIAlertAction(title: cancelTitle, style: .default))
+		
+		rootSplitViewController.present(alertController, animated: true)
+	}
+	
 }

iOS/SceneDelegate.swift

@@ -162,6 +162,11 @@ class SceneDelegate: UIResponder, UIWindowSceneDelegate {
 				}
 			}
 			
+			let filename = context.url.standardizedFileURL.path
+			if filename.hasSuffix(ArticleTheme.nnwThemeSuffix) {
+				self.coordinator.importTheme(filename: filename)
+			}
+			
 		}
 	}