Godot Rust Helper

A simple CLI tool to help you create and update Rust components for your Godot projects.

Install

bash $ cargo install godot_rust_helper

To upgrade:

bash $ cargo install --force godot_rust_helper

Note: This documentation is for version 2.x. Documentation for versions 1.x can be found here.

Step 1: Creating the Project's Library

For each game you create in Godot you will have to create a new library. The library itself is a cargo library and it holds all of the components used in your game.

To create the project's library, navigate to where you would like to store the components (outside of your Godot project directory) and use the new command:

bash $ godot_rust_helper new <destination> <path_to_godot_project> [options]

Let's go over the arguments and options in detail with some examples.

Arguments:

• library_name The name of the library that will contain your Rust components. The name of the library is recommended to be the same or similar in name to your game. Also keep in mind that the library is created using cargo new so you should abide by the cargo project naming standards.
• pathtogodot_project This is the path to the root directory of the Godot project that the components will belong to.

Options: - --targets Native components in Godot can target multiple platforms and godotrusthelper needs to know ahead of time what platforms you plan to target your components for with the available options currently being: windows, linux, and osx. For example if you are targeting Windows and OSX, you need to have have cargo set to build a dll and a dylib file and you would pass --targets=windows,osx as the targets. By default if no targets are passed then just --targets=windows will be set. ---output-path godotrusthelper has to place a gdnlib file and the build files in the game's directory. By default these files are placed at the root of the game directory but you can specify a directory in the game (existing or not) where these files go instead using this option.

examples:

Creating a default library for Windows only builds:

bash $ godot_rust_helper new breakout_components ~/Documents/projects/breakout

Creating an library for Windows, Linux, and OSX builds:

bash $ godot_rust_helper new breakout_components ~/Documents/projects/breakout --targets=windows,linux,osx

Creating a library and having the files output to build-output:

bash $ godot_rust_helper new breakout_components ~/Documents/projects/breakout --output-path ~/Documents/projects/breakout/build-output

Note: The src/lib.rs file is completely managed by godotrusthelper and should not be modified. Any modifications to the file will result in the components not functioning properly or they will be overwritten when a module is created/destroyed. Custom mods can be added to the file (coming soon).

Note: Each instance of the library comes with godot_rust_helper_extensions as a dependency which is going to contain methods to make things easier (such as getting typed nodes) and include methods that are not a part of gdnative but are in gdscript. You do not have to use any extensions if you don't want to but if you are interested in them, check out the extensions here.

If you are getting an error that says that the crate doesn't exist it's because the name of the extension was not right the first time around and it was fixed 1.0.2. To fix it you can update and create the library again or simply go to your Cargo.toml and change godot_rust_helper_extensions to godot_rust_helper_ext.

Step 2: Creating Components

Now that you've created the library, you can go into the newly created folder and see the config file. This config file contains the path to the Godot project directory and the targets passed from the new command. This config file should not be modified manually as godotrusthelper depends on it heavily.

From this directory, we can now begin to make components with the create command like so:

bash $ godot_rust_helper create <class_name>

• name The name passed to this command should be the class name of the component. Class names must start with capital letters. Examples include 'Player', 'Princess', 'Mob', 'HUD', etc.

What this does is create a src/<name>.rs file for the component and adds an entry for it in the src/lib.rs file. If you attach this component as it is to a Node and run the game then "hello, world" will print to the godot console.

Note: This command has to be run from the library's directory.

examples:

bash $ godot_rust_helper create Player

bash $ godot_rust_helper create HUD

Step 3: Building the Library

After you have created your component (or you can do this with the default contents to try it out) you're ready to run a build using:

bash $ godot_rust_helper build

What this does is first run cargo build and then it moves the build files into the Godot project directory.

Note: This command has to be run from the library's directory.

Note: The first time you run this it will take a while as it have to reach out and download the necessary dependencies, every build after that will be much quicker.

The build command also supports the --watch option which will watch the src directory of your component for changes and re-build it automatically.

examples:

Running the build command:

bash $ godot_rust_helper build

Running the build command and watching for changes to any components in the library.

bash $ godot_rust_helper build --watch

Step 4: Using the Components in Godot

The last step that has to be done to use your component in your Godot project is creating the component and attaching it to the node that needs to use it.

After you have created a component and run a build, you can attach the component to a node like so:

1. Choose the node to add the component to and in the inspector go to the script dropdown and choose to add a new script.
2. In the Attach Node Script modal, set the following options:
   • Language: NativeScript
   • Class Name: The name you passed to godot_rust_helper create which is the class name of the Rust component you created.
3. Change the name of the script to match the class name.
4. Click on the newly created .gdns file (or after the steps above it should be active in the inspector already) and in the Library dropdown choose load and select the "library_name.gdnlib" file in the root folder (or the folder you specified with --output-path). This library name is the same name passed to godot_rust_helper new.

Now if you run your game you will see your component's functionality up and running!

Note: If you update your Rust component and run a build you do not have to update the corresponding .gdnlib file in Godot, it will be updated automatically.

Other Commands

The following are commands are situational but are not needed for the basic setup.

destroy

Removes a Rust component from the library. You will still need to remove the component reference from your node in Godot as it will throw an error if you attempt to run the game since the component no longer exists.

bash $ godot_rust_helper destroy <class_name>

• class_name The name of the class to destroy. This should be the same name that was used when it was created with godot_rust_helper create.

examples:

bash $ godot_rust_helper destroy Player

bash $ godot_rust_helper destroy HUD

rebase

Changes the path of the project, godot project directory, and optionally the targets in the config if you cloned/downlaoded the project from elsewhere.

This command has to be used from inside the project you want to rebase.

bash $ godot_rust_helper rebase <path_to_game> [targets]

• pathtogame The path to godot game on your file system.
• targets Optionally change the targets.

examples:

bash $ godot_rust_helper rebase ../path/to/game

bash $ godot_rust_helper rebase ../path/to/game --targets=linux,osx

Tests

bash $ cargo test -- --test-threads=1

License

MIT