How to use conditions in OpenAPI Generator's Mustache templates? - openapi

Question

I'm using OAS3 generator for Java as a Maven plugin to generate POJOs, controllers, delegates etc for my APIs with the Mustache templates from the openapi-generator repository: https://github.com/OpenAPITools/openapi-generator/blob/master/modules/openapi-generator/src/main/resources/JavaSpring/apiController.mustache
I'm trying to edit this template so that the "#Controller" annotation is generated only if a condition is met. I've searched for multiple solutions for this and one of them was using "vendorExtensions".
I've made the following contract with x-generateController vendorExtension:
openapi: 3.0.0
info:
title: User API
description: API for user changes
contact:
name: xxx
url: xxx
email: xxx
license:
name: xxx
url: xxx
version: 1.0.0
tags:
- name: user
x-generateController: True
paths:
/users:
...
And then in the Mustache template file I have put the following:
{{#vendorExtensions.x-generateController}}
#Controller("{{classname}}")
{{/vendorExtensions.x-generateController}}
The generator works just fine without this condition but it seems like it doesn't take into account x-generateController. In fact, if I try to just place it as a comment like this:
// {{vendorExtensions.x-generateController}}
I get only "// " and an empty space. I've also tried putting it at the "endpoint level" and not in the "info level" and the problem is the same.
Is there anything more that I should've done in the configuration? Is there any alternative for a condition in the Mustache template?