Add basic ExtensionPoint support.

Shared/ExtensionPoints/SendToMarsEditCommand.swift

@@ -0,0 +1,84 @@
+//
+//  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
+	}
+}