Add parameters to setup ?

[ThomasCartier]

Hi,

How may I add a parameter to the setup function ?

 App::new()
                        .add_plugins(MinimalPlugins)
                        .add_systems(Startup, setup )
                        .add_systems(Update, animate)
                        .run();

 fn setup(mut commands: Commands /*, path_to_load : &str <- this one here*/) {

                // ------------------------------------------------
                // Place the model from the given path
                // ------------------------------------------------
                ...
 }

Or alternatively the best way to access it if it's not passed directly.

I could't find an example that needs some external info for its setup.

Thanks!

[rlidwka]

Add a resource, then request it:

 App::new()
      .add_plugins(MinimalPlugins)
      .add_systems(Startup, setup)
      .add_resource(PathToLoad("..."))

fn setup(mut commands: Commands, path: Res<PathToLoad>) {...}

Alternatively, you can make a higher-order function, but that's pretty advanced:

 App::new()
      .add_plugins(MinimalPlugins)
      .add_systems(Startup, setup("path_to_load"))

fn setup(path: &str) -> impl SomeBlackMagic {
  return move |commands: &Commands| {
    todo!()
  }
}

[ThomasCartier]

Thanks a lot 👍

[ThomasCartier]

hmm,
just tried and I get the following error :

  #[derive(Resource)]

  struct PathToLoad<'a>(&'a String);


  fn launch(s: &String) {

          App::new()
                  .add_plugins(MinimalPlugins)
                  .add_systems(Startup, setup)
                  .add_systems(Update, animate)
                  .add_resource(PathToLoad(s))
                  .run();
  }

->no method namedadd_resourcefound for mutable reference&mut App in the current scope
-> there is a method with a similar name: init_resource``

but the suggestion is not what we want, right ?

[ThomasCartier]

insert_resource did the trick 👍

Thanks a lot