Handle document names better

Now it's possible for the document title to be
null, just like an author name. Also, the
document title is used for the default filename
when exporting.

SilicaViewer/AppDelegate.swift

@@ -71,6 +71,8 @@ class AppDelegate: NSObject, NSApplicationDelegate, NSUserInterfaceValidations {
         let savePanel = NSSavePanel()
         savePanel.title = "Save Timelapse"
         savePanel.allowedFileTypes = ["public.mpeg-4"]
+        savePanel.nameFieldStringValue = (document?.getIdealFilename())!
+
         savePanel.begin { (result) in
             if result.rawValue == NSApplication.ModalResponse.OK.rawValue {
                 guard let archive = Archive(data: (document?.data)!, accessMode: Archive.AccessMode.read) else  {

SilicaViewer/Document.swift

@@ -113,6 +113,14 @@ class Document: NSDocument {
         return ofType == "com.procreate"
     }
     
+    func getIdealFilename() -> String {
+        if (!(info.name.isEmpty)) {
+            return info.name
+        } else {
+            return fileURL!.deletingPathExtension().lastPathComponent
+        }
+    }
+    
     /*
      Pass in an object from the $object array, which always contains a $class key.
      */

SilicaViewer/InfoViewController.swift

@@ -13,7 +13,11 @@ class InfoViewController: NSViewController {
     override func viewWillAppear() {
         super.viewDidAppear()
         
-        nameLabel.stringValue = "Name: " + document!.info.name
+        if document!.info.authorName.isEmpty {
+            nameLabel.stringValue = "Name is not set."
+        } else {
+            nameLabel.stringValue = "Name: " + document!.info.name
+        }
         
         if document!.info.authorName.isEmpty {
             authorNameField.stringValue = "Author name is not set."