Add basic ExtensionPoint support.

Shared/ExtensionPoints/ExtensionPoint.swift

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+//
+//  ExtensionPoint.swift
+//  NetNewsWire
+//
+//  Created by Maurice Parker on 4/7/20.
+//  Copyright © 2020 Ranchero Software. All rights reserved.
+//
+
+import Foundation
+import RSCore
+
+protocol ExtensionPoint {
+
+	/// The title of the command.
+	var title: String { get }
+
+	/// The template image for the command.
+	var templateImage: RSImage { get }
+
+}

Shared/ExtensionPoints/ExtensionPointManager.swift

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+//
+//  ExtensionPointManager.swift
+//  NetNewsWire
+//
+//  Created by Maurice Parker on 4/7/20.
+//  Copyright © 2020 Ranchero Software. All rights reserved.
+//
+
+import Foundation
+import FeedProvider
+import RSCore
+
+struct ExtensionPointManager {
+	
+	static let shared = ExtensionPointManager()
+	
+	let marsEdit = SendToMarsEditCommand()
+	let microblog = SendToMicroBlogCommand()
+	let twitter = TwitterFeedProvider()
+	
+	let availableExtensionPoints: [ExtensionPoint]
+	let activeSendToCommands: [SendToCommand]
+	let activeFeedProviders: [FeedProvider]
+	
+	init() {
+		#if os(macOS)
+		#if DEBUG
+		availableExtensionPoints = [marsEdit, microblog, twitter]
+		activeSendToCommands = [marsEdit, microblog]
+		activeFeedProviders = [twitter]
+		#else
+		availableExtensionPoints = [marsEdit, microblog, twitter]
+		activeSendToCommands = [marsEdit, microblog]
+		activeFeedProviders = [twitter]
+		#endif
+		#else
+		#if DEBUG
+		availableExtensionPoints = [twitter]
+		activeSendToCommands = []()
+		activeFeedProviders = [twitter]
+		#else
+		availableExtensionPoints = [twitter]
+		activeSendToCommands = []()
+		activeFeedProviders = [twitter]
+		#endif
+		#endif
+	}
+	
+}

Shared/ExtensionPoints/ExtensionPointType.swift

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+//
+//  ExtensionPointType.swift
+//  NetNewsWire
+//
+//  Created by Maurice Parker on 4/7/20.
+//  Copyright © 2020 Ranchero Software. All rights reserved.
+//
+
+import Foundation
+
+enum ExtensionPoint: Int, Codable {
+	case sentToCommand = 1
+	case feedProvider = 2
+}

Shared/ExtensionPoints/SendToMarsEditCommand.swift

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+//
+//  SendToMarsEditCommand.swift
+//  NetNewsWire
+//
+//  Created by Brent Simmons on 1/8/18.
+//  Copyright © 2018 Ranchero Software. All rights reserved.
+//
+
+import AppKit
+import RSCore
+import Articles
+
+final class SendToMarsEditCommand: ExtensionPoint, SendToCommand {
+
+	let title = NSLocalizedString("MarsEdit", comment: "MarsEdit")
+	let templateImage = AppAssets.extensionPointMarsEdit
+
+	var image: NSImage? {
+		return appToUse()?.icon ?? nil
+	}
+
+
+	private let marsEditApps = [UserApp(bundleID: "com.red-sweater.marsedit4"), UserApp(bundleID: "com.red-sweater.marsedit")]
+
+	func canSendObject(_ object: Any?, selectedText: String?) -> Bool {
+
+		if let _ = appToUse() {
+			return true
+		}
+		return false
+	}
+
+	func sendObject(_ object: Any?, selectedText: String?) {
+
+		guard canSendObject(object, selectedText: selectedText) else {
+			return
+		}
+		guard let article = (object as? ArticlePasteboardWriter)?.article else {
+			return
+		}
+		guard let app = appToUse(), app.launchIfNeeded(), app.bringToFront() else {
+			return
+		}
+
+		send(article, to: app)
+	}
+}
+
+private extension SendToMarsEditCommand {
+
+	func send(_ article: Article, to app: UserApp) {
+
+		// App has already been launched.
+
+		guard let targetDescriptor = app.targetDescriptor() else {
+			return
+		}
+
+		let body = article.contentHTML ?? article.contentText ?? article.summary
+		let authorName = article.authors?.first?.name
+
+		let sender = SendToBlogEditorApp(targetDescriptor: targetDescriptor, title: article.title, body: body, summary: article.summary, link: article.externalURL, permalink: article.url, subject: nil, creator: authorName, commentsURL: nil, guid: article.uniqueID, sourceName: article.webFeed?.nameForDisplay, sourceHomeURL: article.webFeed?.homePageURL, sourceFeedURL: article.webFeed?.url)
+		let _ = sender.send()
+	}
+	
+	func appToUse() -> UserApp? {
+
+		marsEditApps.forEach{ $0.updateStatus() }
+
+		for app in marsEditApps {
+			if app.isRunning {
+				return app
+			}
+		}
+
+		for app in marsEditApps {
+			if app.existsOnDisk {
+				return app
+			}
+		}
+
+		return nil
+	}
+}

Shared/ExtensionPoints/SendToMicroBlogCommand.swift

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+//
+//  SendToMicroBlogCommand.swift
+//  NetNewsWire
+//
+//  Created by Brent Simmons on 1/8/18.
+//  Copyright © 2018 Ranchero Software. All rights reserved.
+//
+
+import AppKit
+import Articles
+import RSCore
+
+// Not undoable.
+
+final class SendToMicroBlogCommand: ExtensionPoint, SendToCommand {
+
+	let title = NSLocalizedString("Micro.blog", comment: "Micro.blog")
+	let templateImage = AppAssets.extensionPointMicroblog
+
+	var image: NSImage? {
+		return microBlogApp.icon
+	}
+
+	private let microBlogApp = UserApp(bundleID: "blog.micro.mac")
+
+	func canSendObject(_ object: Any?, selectedText: String?) -> Bool {
+
+		microBlogApp.updateStatus()
+		guard microBlogApp.existsOnDisk, let article = (object as? ArticlePasteboardWriter)?.article, let _ = article.preferredLink else {
+			return false
+		}
+
+		return true
+	}
+	
+	func sendObject(_ object: Any?, selectedText: String?) {
+
+		guard canSendObject(object, selectedText: selectedText) else {
+			return
+		}
+		guard let article = (object as? ArticlePasteboardWriter)?.article else {
+			return
+		}
+		guard microBlogApp.launchIfNeeded(), microBlogApp.bringToFront() else {
+			return
+		}
+
+		// TODO: get text from contentHTML or contentText if no title and no selectedText.
+		// TODO: consider selectedText.
+
+		let s = article.attributionString + article.linkString
+
+		let urlQueryDictionary = ["text": s]
+		guard let urlQueryString = urlQueryDictionary.urlQueryString else {
+			return
+		}
+		guard let url = URL(string: "microblog://post?" + urlQueryString) else {
+			return
+		}
+
+		let _ = try? NSWorkspace.shared.open(url, options: [], configuration: [:])
+	}
+}
+
+private extension Article {
+
+	var attributionString: String {
+
+		// Feed name, or feed name + author name (if author is specified per-article).
+		// Includes trailing space.
+
+		if let feedName = webFeed?.nameForDisplay, let authorName = authors?.first?.name {
+			return feedName + ", " + authorName + ": "
+		}
+		if let feedName = webFeed?.nameForDisplay {
+			return feedName + ": "
+		}
+		return ""
+	}
+
+	var linkString: String {
+
+		// Title + link or just title (if no link) or just link if no title
+
+		if let title = title, let link = preferredLink {
+			return "[" + title + "](" + link + ")"
+		}
+		if let preferredLink = preferredLink {
+			return preferredLink
+		}
+		if let title = title {
+			return title
+		}
+		return ""
+	}
+
+}

Shared/ExtensionPoints/TwitterFeedProvider+Extensions.swift

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+//
+//  TwitterFeedProvider+Extensions.swift
+//  NetNewsWire
+//
+//  Created by Maurice Parker on 4/7/20.
+//  Copyright © 2020 Ranchero Software. All rights reserved.
+//
+
+import Foundation
+import FeedProvider
+import RSCore
+
+extension TwitterFeedProvider: ExtensionPoint {
+	
+	var title: String {
+		return NSLocalizedString("Twitter", comment: "Twitter")
+	}
+
+	var templateImage: RSImage {
+		return AppAssets.extensionPointTwitter
+	}
+
+}