Fix UNIX script for DirectoryDocument (fix #1705)

CHANGELOG.md

@@ -9,6 +9,11 @@
 - [beta] Add the Czech and Dutch localizations for strings newly added in CotEditor 5.0.0.
 
 
+### Fixes
+
+- [beta] Fix an issue that UNIX scripts could not get the document object displayed in a folder.
+
+
 ### Known Issues
 
 - Strings newly added are not yet localized in French and Portuguese.

CotEditor/Sources/DocumentController.swift

@@ -252,6 +252,20 @@ final class DocumentController: NSDocumentController {
 
     // MARK: Public Methods
 
+    /// The current `Document`.
+    var currentPlainTextDocument: Document? {
+
+        switch self.currentDocument {
+            case let document as Document:
+                document
+            case let document as DirectoryDocument:
+                document.currentDocument as? Document
+            default:
+                nil
+        }
+    }
+
+
     /// Opens an untitled document with the given contents or recycles the transient document if available.
     ///
     /// - Parameters:

CotEditor/Sources/UnixScript.swift

@@ -92,7 +92,7 @@ struct UnixScript: Script {
             throw ScriptFileError(.read, url: self.url)
         }
 
-        weak var document = await NSDocumentController.shared.currentDocument as? Document
+        weak var document = await (DocumentController.shared as! DocumentController).currentPlainTextDocument
 
         let input: String?
         if let inputType = InputType(scanning: script) {