Fix compile project concurrency

Possible fix for #14

Signed-off-by: William Vinnicombe <william.vinnicombe@raspberrypi.com>

src/commands/compileProject.mts

@@ -1,4 +1,5 @@
 import { commands, tasks, window } from "vscode";
+import { EventEmitter } from 'events';
 import { Command } from "./command.mjs";
 import Logger from "../logger.mjs";
 import Settings, { SettingsKey } from "../settings.mjs";
@@ -34,7 +35,25 @@ export default class CompileProjectCommand extends Command {
 
     if (task) {
       // Execute the task
+      var emitter = new EventEmitter();
+
+      // add callbacks for task completion
+      var end = tasks.onDidEndTaskProcess(e => {
+        emitter.emit("terminated", e.exitCode);
+      });
+      var end2 = tasks.onDidEndTask(e => {
+        emitter.emit("terminated", -1);
+      });
+
       await tasks.executeTask(task);
+      var code = await new Promise<Number>((resolve, reject) => {
+        emitter.on("terminated", code => resolve(code));
+      });
+
+      // dispose of callbacks
+      end.dispose();
+      end2.dispose();
+      this._logger.debug("Task 'Compile Project' completed with code " + code);
     } else {
       // Task not found
       this._logger.error("Task 'Compile Project' not found.");