add .pde support

package.json

@@ -505,7 +505,8 @@
       {
         "id": "cpp",
         "extensions": [
-          ".ino"
+          ".ino",
+          ".pde"
         ]
       }
     ],

src/extension.ts

@@ -1,6 +1,7 @@
 // Copyright (c) Microsoft Corporation. All rights reserved.
 // Licensed under the MIT license.
 
+import * as fs from "fs";
 import * as path from "path";
 import * as Uuid from "uuid/v4";
 import * as vscode from "vscode";
@@ -326,6 +327,30 @@ export async function activate(context: vscode.ExtensionContext) {
             vscode.commands.executeCommand("setContext", "vscode-arduino:showExampleExplorer", true);
         }
     });
+
+    vscode.workspace.onDidOpenTextDocument(async (document) => {
+        if (/\.pde$/.test(document.uri.fsPath)) {
+            const newFsName = document.uri.fsPath.replace(/\.pde$/, ".ino");
+            await vscode.commands.executeCommand("workbench.action.closeActiveEditor");
+            fs.renameSync(document.uri.fsPath, newFsName);
+            await vscode.commands.executeCommand("vscode.open", vscode.Uri.file(newFsName));
+        }
+    });
+
+    vscode.window.onDidChangeActiveTextEditor(async (editor) => {
+        if (!editor) {
+            return;
+        }
+
+        const document = editor.document;
+        if (/\.pde$/.test(document.uri.fsPath)) {
+            const newFsName = document.uri.fsPath.replace(/\.pde$/, ".ino");
+            await vscode.commands.executeCommand("workbench.action.closeActiveEditor");
+            fs.renameSync(document.uri.fsPath, newFsName);
+            await vscode.commands.executeCommand("vscode.open", vscode.Uri.file(newFsName));
+        }
+    });
+
     Logger.traceUserData("end-activate-extension", { correlationId: activeGuid });
 }