Make temporary dir creation asynchronous

Author: mgsium

extensions/ql-vscode/src/extension.ts

@@ -500,20 +500,24 @@ async function activateWithInstalledDistribution(
     const pathToQhelp = selectedQuery ? selectedQuery.path : window.activeTextEditor!.document.uri.fsPath;
     if(pathToQhelp) {
       // Create temporary directory
-      const tmpDir = tmp.dirSync();
-      const relativePathToMd = path.basename(pathToQhelp, '.qhelp') + '.md';
-      const absolutePathToMd = path.join(tmpDir.name, relativePathToMd);
-      const uri = Uri.file(absolutePathToMd);
-      try {
-        await cliServer.generateQueryHelp(pathToQhelp , absolutePathToMd);
-        await commands.executeCommand('markdown.showPreviewToSide', uri);
-      } catch (err) {
-        const errorMessage =  err.message.includes('Generating qhelp in markdown') ? (
-          `Could not generate markdown from ${pathToQhelp}: Bad formatting in .qhelp file.`
-        ) : `Could not open a preview of the generated file (${absolutePathToMd}).`;
-        void helpers.showAndLogErrorMessage(errorMessage);
-      }
+      return tmp.dir().then(async o => {
+        const relativePathToMd = path.basename(pathToQhelp, '.qhelp') + '.md';
+        const absolutePathToMd = path.join(o.path, relativePathToMd);
+        const uri = Uri.file(absolutePathToMd);
+        try {
+          await cliServer.generateQueryHelp(pathToQhelp , absolutePathToMd);
+          await commands.executeCommand('markdown.showPreviewToSide', uri);
+        } catch (err) {
+          const errorMessage =  err.message.includes('Generating qhelp in markdown') ? (
+            `Could not generate markdown from ${pathToQhelp}: Bad formatting in .qhelp file.`
+          ) : `Could not open a preview of the generated file (${absolutePathToMd}).`;
+          void helpers.showAndLogErrorMessage(errorMessage);
+        }
+        // Manual cleanup
+        void o.cleanup();
+      });
     }
+    
   }
 
   async function openReferencedFile(