Method name_package_module

crates/wit-bindgen/src/lib.rs:315–354

If the package `id` is the only package with its namespace/name combo then pass through the name unmodified. If, however, there are multiple versions of this package then the package module is going to get version information.

(&self, resolve: &Resolve, id: PackageId)

    /// versions of this package then the package module is going to get version
    /// information.
    fn name_package_module(&self, resolve: &Resolve, id: PackageId) -> String {
        let pkg = &resolve.packages[id];
        let versions_with_same_name = resolve
            .packages
            .iter()
            .filter_map(|(_, p)| {
                if p.name.namespace == pkg.name.namespace && p.name.name == pkg.name.name {
                    Some(&p.name.version)
                } else {
                    None
                }
            })
            .collect::<Vec<_>>();
        let base = pkg.name.name.to_snake_case();
        if versions_with_same_name.len() == 1 {
            return base;
        }

        let version = match &pkg.name.version {
            Some(version) => version,
            // If this package didn't have a version then don't mangle its name
            // and other packages with the same name but with versions present
            // will have their names mangled.
            None => return base,
        };

        // Here there's multiple packages with the same name that differ only in
        // version, so the version needs to be mangled into the Rust module name
        // that we're generating. This in theory could look at all of
        // `versions_with_same_name` and produce a minimal diff, e.g. for 0.1.0
        // and 0.2.0 this could generate "foo1" and "foo2", but for now
        // a simpler path is chosen to generate "foo0_1_0" and "foo0_2_0".
        let version = version
            .to_string()
            .replace('.', "_")
            .replace('-', "_")
            .replace('+', "_")
            .to_snake_case();
        format!("{base}{version}")
    }

    fn generate(&mut self, resolve: &Resolve, id: WorldId) -> anyhow::Result<String> {
        self.types.analyze(resolve, id);