basic readonly scripting support for account, feed, folder

Evergreen/Scriptability/Feed+Scriptability.swift

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+//
+//  Feed+Scriptability.swift
+//  Evergreen
+//
+//  Created by Olof Hellman on 1/10/18.
+//  Copyright © 2018 Olof Hellman. All rights reserved.
+//
+
+import Foundation
+import Account
+import Data
+
+@objc(ScriptableFeed)
+class ScriptableFeed: NSObject, UniqueIdScriptingObject {
+
+    let feed:Feed
+    let container:ScriptingObjectContainer
+    
+    init (_ feed:Feed, container:ScriptingObjectContainer) {
+        self.feed = feed
+        self.container = container
+    }
+
+    @objc(objectSpecifier)
+    override var objectSpecifier: NSScriptObjectSpecifier? {
+        let scriptObjectSpecifier = self.container.makeFormUniqueIDScriptObjectSpecifier(forObject:self)
+        return (scriptObjectSpecifier)
+    }
+
+    // MARK: --- ScriptingObject protocol ---
+
+    var scriptingKey: String {
+        return "feeds"
+    }
+
+    // MARK: --- UniqueIdScriptingObject protocol ---
+
+    // I am not sure if account should prefer to be specified by name or by ID
+    // but in either case it seems like the accountID would be used as the keydata, so I chose ID
+
+    var scriptingUniqueId:Any {
+        return feed.feedID
+    }
+    
+    // MARK: --- Scriptable properties ---
+    
+    @objc(url)
+    var url:String  {
+        return self.feed.url
+    }
+    
+    @objc(uniqueId)
+    var uniqueId:String  {
+        return self.feed.feedID
+    }
+    
+    @objc(name)
+    var name:String  {
+        return self.feed.name ?? ""
+    }
+
+}