Add a whole ton more code.

Evergreen/ProgressWindow/IndeterminateProgressWindowController.swift

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+//
+//  IndeterminateProgressWindowController.swift
+//  Evergreen
+//
+//  Created by Brent Simmons on 8/28/16.
+//  Copyright © 2016 Ranchero Software. All rights reserved.
+//
+
+import Cocoa
+
+class IndeterminateProgressWindowController: NSWindowController {
+
+	@IBOutlet var messageLabel: NSTextField!
+	@IBOutlet var progressIndicator: NSProgressIndicator!
+	dynamic var message = ""
+
+	convenience init(message: String) {
+
+		self.init(windowNibName: "IndeterminateProgressWindow")
+		self.message = message
+	}
+
+	override func windowDidLoad() {
+
+		progressIndicator.startAnimation(self)
+	}
+}
+
+func runIndeterminateProgressWithMessage(_ message: String) {
+
+	let windowController = IndeterminateProgressWindowController(message: message)
+	NSApplication.shared().runModal(for: windowController.window!)
+}
+
+func stopIndeterminateProgress() {
+
+	NSApplication.shared().stopModal()
+}