Rune scripting

Rune is the scripting language. A script is one object per node, and every component on the node is a field it calls.

• update(this, dt) runs every frame, and fixed_update on the fixed step, before physics.
• exports() returns the defaults. A scene overrides only what it changes, and the inspector lists them per node.
• Each component is a field on the node with every function that drives it, plus get(), set(), has() and remove().
• The modules, components and assets references are read out of a running engine, and CI fails when they drift.

pub fn exports() {
    #{ speed: 2.0 }
}

pub fn fixed_update(this, dt) {
    this.node.body2d.apply_impulse(this.speed * dt, 0.0);
}

Tooling

• After physics2d:: completion lists that module, and after node.body2d. what acts on that component.
• ⌘B goes to a definition, ⌘⇧R renames across files, and ⌥⇧F formats.
• The Problems dock checks on save for a missing script, prefab or asset, and for a shader that will not link.
• A VS Code extension spawns balaur lsp, which runs the same checks.

• balaur check resolves every component method a script calls against the scene it runs on, and a misspelled one names its file and line.
• Findings are warnings, and --strict makes them errors for CI.

Docs

• Scripting
• Tooling
• balaur check