Improve UI for selecting the URI of a new local class created via command

src/commands/newFile.ts

@@ -838,11 +838,50 @@ ClassMethod %OnDashboardAction(pAction As %String, pContext As %ZEN.proxyObject)
       clsUri = DocumentContentProvider.getUri(`${cls}.cls`, undefined, undefined, undefined, wsFolder.uri);
     } else {
       // Ask the user for the URI
-      clsUri = await vscode.window.showSaveDialog({
-        defaultUri: getLocalUri(cls, wsFolder), // Use the export settings to determine the default URI
-        filters: {
-          Classes: ["cls"],
-        },
+      const localUri = getLocalUri(cls, wsFolder);
+      clsUri = await new Promise<vscode.Uri>((resolve) => {
+        const inputBox = vscode.window.createInputBox();
+        inputBox.ignoreFocusOut = true;
+        inputBox.buttons = [{ iconPath: new vscode.ThemeIcon("save-as"), tooltip: "Show 'Save As' dialog" }];
+        inputBox.prompt = `The path is relative to the workspace folder root (${wsFolder.uri.toString(true)}). Intermediate folders that do not exist will be created. Click the 'Save As' icon to open the standard save dialog instead.`;
+        inputBox.title = "Enter a file path for the new class";
+        inputBox.value = localUri.path.slice(wsFolder.uri.path.length);
+        inputBox.valueSelection = [inputBox.value.length, inputBox.value.length];
+        let showingSave = false;
+        inputBox.onDidTriggerButton(() => {
+          // User wants to use the save dialog
+          showingSave = true;
+          inputBox.hide();
+          vscode.window
+            .showSaveDialog({
+              defaultUri: localUri,
+              filters: {
+                Classes: ["cls"],
+              },
+            })
+            .then(
+              (u) => resolve(u),
+              () => resolve(undefined)
+            );
+        });
+        inputBox.onDidAccept(() => {
+          if (typeof inputBox.validationMessage != "string") {
+            resolve(
+              wsFolder.uri.with({
+                path: `${wsFolder.uri.path}${!wsFolder.uri.path.endsWith("/") ? "/" : ""}${inputBox.value.replace(/^\/+/, "")}`,
+              })
+            );
+            inputBox.hide();
+          }
+        });
+        inputBox.onDidHide(() => {
+          if (!showingSave) resolve(undefined);
+          inputBox.dispose();
+        });
+        inputBox.onDidChangeValue((value) => {
+          inputBox.validationMessage = value.endsWith(".cls") ? undefined : "File extension must be .cls";
+        });
+        inputBox.show();
       });
     }