handle def file formatter

client/src/extension.ts

@@ -1,5 +1,10 @@
 import * as vscode from "vscode"
-import { formatCdlFile, completionHandlerCdl, hoverCdlHandler } from "./common/handlers"
+import {
+    formatCdlFile,
+    completionHandlerCdl,
+    hoverCdlHandler,
+    formatDefFile
+} from "./common/handlers"
 
 export function activate(context: vscode.ExtensionContext) {
     const formatCdlProvider = vscode.languages.registerDocumentFormattingEditProvider(
@@ -48,6 +53,23 @@ export function activate(context: vscode.ExtensionContext) {
         }
     )
     context.subscriptions.push(hoverCdlProvider)
+
+    const formatDefProvider = vscode.languages.registerDocumentFormattingEditProvider(
+        { scheme: "file", language: "def" },
+        {
+            provideDocumentFormattingEdits(document: vscode.TextDocument): vscode.TextEdit[] {
+                const text = document.getText()
+                const formattedText = formatDefFile(text)
+                const fullRange = new vscode.Range(
+                    document.positionAt(0),
+                    document.positionAt(text.length)
+                )
+                return [vscode.TextEdit.replace(fullRange, formattedText)]
+            }
+        }
+    )
+
+    context.subscriptions.push(formatDefProvider)
 }
 
 export function deactivate() {}