"rust file is not part of the scripts crate"

[atollk]

Hey. I tried to setup the library but I am struggling with attaching the scripts to existing nodes. I can select "RustScript" as a language in Godot and I can find the file in the "Path" field, but I always get the error "rust file is not part of the scripts crate".

From what I can tell, I did everything right according to the setup guide, so I am lost here.

Could it be because I had to symlink the src directory to res://? (I am using the recommended directory setup)

// lib.rs

pub mod example_script;

godot_rust_script::define_script_root!();

#[gdextension]
unsafe impl ExtensionLibrary for DropDefense {
    fn on_stage_init(stage: InitStage) {
        if stage == InitStage::Scene {
            godot_rust_script::init!(crate);
        }
    }

    fn on_stage_deinit(stage: InitStage) {
        if stage == InitStage::Scene {
            godot_rust_script::deinit!();
        }
    }
}

// example_script.rs

#[derive(Debug, GodotScript)]
struct ExampleScript {
    #[export]
    pub flag: bool,
    pub path: GString,
    property: Option<Gd<Object>>,
    base: Gd<Node3D>,
}

#[godot_script_impl]
impl ExampleScript {
    pub fn perform_action(&self, value: i32) -> bool {
        value > 0
    }

    pub fn _process(&mut self, delta: f64) {
        godot_print!(
            "example script doing process stuff: {}, {}",
            delta,
            self.base
        );
    }
}

[lunar-me]

I reckon that error comes from validate_path in RustScriptLanguage, which rejects any script whose path does not start with the directory the library registered as its script root. The registered root is not the whole crate, it is computed by the define_script_root! macro as CARGO_MANIFEST_DIR, then "/src", then the crate's module path with "::" turned into "/" and the crate name's dashes turned into underscores.
So if your crate is named my-game and your init! macro is invoked from the module my_game::scripts, the accepted root is /src/scripts, and a .rs file anywhere else in the crate fails that starts_with check and produces exactly this message. Two conditions therefore have to hold.

1. Rust file must live under <crate_root>/src/<module_path_after_the_crate_name>, not merely somewhere inside the crate, and not in src directory of a different crate. 2) crate itself has to sit inside the Godot project, because the registered root is passed through ProjectSettings.localize_path() and is compared against the res:// path the editor reports; a crate outside the project tree cannot localise to a matching res:// path, so the comparison fails even when the file layout is otherwise correct.
   Both the error and the root constant are compile-time/macro-derived, so the quickest way to see what the library actually expects is to print __GODOT_RUST_SCRIPT_SRC_ROOT from your crate - that tells you the exact prefix your script's res:// path must start with.

Sorry if I explained it way too clumsy :)

Good luck!

[atollk]

Thanks, that makes sense. I created #102 to improve that behavior.