refactor: integrate DirectoryExtension for directory recreation in generate script

scripts/docs/directory_extension.dart

@@ -0,0 +1,50 @@
+import "dart:io";
+import "dart:typed_data";
+
+import "package:path/path.dart";
+
+extension DirectoryExtension on Directory {
+  Future<void> recreate({
+    Iterable<String> filenamesToPreserve = const [],
+    bool recursive = true,
+  }) async {
+    final filesToPreserveContents = <File, Uint8List>{};
+
+    for (final filename in filenamesToPreserve) {
+      final filePath = joinAll([path, filename]);
+
+      switch (await FileSystemEntity.type(filePath)) {
+        case .directory:
+          if (!recursive) break;
+
+          final Directory dir = .new(filePath);
+
+          await for (final file in dir.list(recursive: recursive)) {
+            if (file is! File) continue;
+            filesToPreserveContents[file] = await file.readAsBytes();
+          }
+
+          break;
+        case .file:
+          final File file = .new(filePath);
+
+          filesToPreserveContents[file] = await file.readAsBytes();
+
+          break;
+        default:
+          break;
+      }
+    }
+
+    await delete(recursive: true);
+    await create();
+
+    for (final entry in filesToPreserveContents.entries) {
+      if (!await entry.key.parent.exists()) {
+        await entry.key.parent.create(recursive: true);
+      }
+
+      await entry.key.writeAsBytes(entry.value, flush: true);
+    }
+  }
+}

scripts/docs/generate.dart

@@ -1,38 +1,23 @@
 // dart scripts/docs/generate.dart
 
 import "dart:io";
-import "dart:typed_data";
 
 import "package:args/command_runner.dart";
 import "package:discloud/cli/runner.dart";
 import "package:discloud/version.dart";
-import "package:path/path.dart";
 
+import "directory_extension.dart";
 import "generate/commands.dart";
 import "generate/index.dart";
 import "markdown_to_html_converter.dart";
 
 const _docsRootPath = "docs";
+const _filenamesToPreserve = {"_config.yml"};
 
 void main() async {
   final docRootDir = Directory(_docsRootPath);
 
-  const filesToPreserve = {"_config.yml"};
-  final filesToPreserveContents = <File, Uint8List>{};
-
-  for (final filename in filesToPreserve) {
-    final File file = .new(joinAll([_docsRootPath, filename]));
-    if (!await file.exists()) continue;
-
-    filesToPreserveContents[file] = await file.readAsBytes();
-  }
-
-  await docRootDir.delete(recursive: true);
-  await docRootDir.create(recursive: true);
-
-  for (final entry in filesToPreserveContents.entries) {
-    await entry.key.writeAsBytes(entry.value, flush: true);
-  }
+  await docRootDir.recreate(filenamesToPreserve: _filenamesToPreserve);
 
   const version = packageVersion == "0.0.0" ? "" : " v$packageVersion";