alef 0.83.0

use minijinja::Environment;

static TEMPLATES: &[(&str, &str)] = &[
    (
        "enum_variant_constructor.rs.jinja",
        include_str!("templates/enum_variant_constructor.rs.jinja"),
    ),
    (
        "unregistration_fn.jinja",
        include_str!("templates/unregistration_fn.jinja"),
    ),
    ("clear_fn.jinja", include_str!("templates/clear_fn.jinja")),
    ("registration_fn.jinja", include_str!("templates/registration_fn.jinja")),
    (
        "sync_method_unit_return.jinja",
        include_str!("templates/sync_method_unit_return.jinja"),
    ),
    (
        "sync_method_string_return.jinja",
        include_str!("templates/sync_method_string_return.jinja"),
    ),
    (
        "sync_method_complex_return.jinja",
        include_str!("templates/sync_method_complex_return.jinja"),
    ),
    (
        "async_method_unit_return.jinja",
        include_str!("templates/async_method_unit_return.jinja"),
    ),
    (
        "async_method_string_return.jinja",
        include_str!("templates/async_method_string_return.jinja"),
    ),
    (
        "async_method_complex_return.jinja",
        include_str!("templates/async_method_complex_return.jinja"),
    ),
    (
        "bridge_constructor.jinja",
        include_str!("templates/bridge_constructor.jinja"),
    ),
    ("visitor_bridge.jinja", include_str!("templates/visitor_bridge.jinja")),
    (
        "conversion_options.jinja",
        include_str!("templates/conversion_options.jinja"),
    ),
    ("bridge_function.jinja", include_str!("templates/bridge_function.jinja")),
    (
        "sync_method_non_unit_return.jinja",
        include_str!("templates/sync_method_non_unit_return.jinja"),
    ),
    ("visitor_method.jinja", include_str!("templates/visitor_method.jinja")),
    (
        "r_free_function_wrapper.jinja",
        include_str!("templates/r_free_function_wrapper.jinja"),
    ),
    (
        "r_type_class_env.jinja",
        include_str!("templates/r_type_class_env.jinja"),
    ),
    (
        "r_method_binding.jinja",
        include_str!("templates/r_method_binding.jinja"),
    ),
    (
        "r_from_json_factory.jinja",
        include_str!("templates/r_from_json_factory.jinja"),
    ),
    (
        "r_dollar_dispatch.jinja",
        include_str!("templates/r_dollar_dispatch.jinja"),
    ),
    (
        "r_bracket_dispatch.jinja",
        include_str!("templates/r_bracket_dispatch.jinja"),
    ),
    (
        "r_namespace_export.jinja",
        include_str!("templates/r_namespace_export.jinja"),
    ),
    (
        "r_namespace_s3method.jinja",
        include_str!("templates/r_namespace_s3method.jinja"),
    ),
    ("r_s3_generic.jinja", include_str!("templates/r_s3_generic.jinja")),
    ("r_s3_method.jinja", include_str!("templates/r_s3_method.jinja")),
    (
        "r_namespace_s3method_named.jinja",
        include_str!("templates/r_namespace_s3method_named.jinja"),
    ),
    ("r_use_dyn_lib.jinja", include_str!("templates/r_use_dyn_lib.jinja")),
    (
        "r_namespace_use_dyn_lib.jinja",
        include_str!("templates/r_namespace_use_dyn_lib.jinja"),
    ),
    (
        "flat_enum_derive.jinja",
        include_str!("templates/flat_enum_derive.jinja"),
    ),
    (
        "flat_enum_struct_header.jinja",
        include_str!("templates/flat_enum_struct_header.jinja"),
    ),
    (
        "flat_enum_discriminator_field.jinja",
        include_str!("templates/flat_enum_discriminator_field.jinja"),
    ),
    (
        "flat_enum_variant_field.jinja",
        include_str!("templates/flat_enum_variant_field.jinja"),
    ),
    (
        "flat_enum_struct_footer.jinja",
        include_str!("templates/flat_enum_struct_footer.jinja"),
    ),
    (
        "flat_enum_from_core_impl.jinja",
        include_str!("templates/flat_enum_from_core_impl.jinja"),
    ),
    (
        "flat_enum_from_core_variant_unit.jinja",
        include_str!("templates/flat_enum_from_core_variant_unit.jinja"),
    ),
    (
        "flat_enum_from_core_variant_tuple.jinja",
        include_str!("templates/flat_enum_from_core_variant_tuple.jinja"),
    ),
    (
        "flat_enum_from_core_variant_struct.jinja",
        include_str!("templates/flat_enum_from_core_variant_struct.jinja"),
    ),
    (
        "flat_enum_from_core_impl_footer.jinja",
        include_str!("templates/flat_enum_from_core_impl_footer.jinja"),
    ),
    (
        "flat_enum_from_core_impl_catch_all.jinja",
        include_str!("templates/flat_enum_from_core_impl_catch_all.jinja"),
    ),
    (
        "flat_enum_from_binding_impl.jinja",
        include_str!("templates/flat_enum_from_binding_impl.jinja"),
    ),
    (
        "flat_enum_from_binding_variant.jinja",
        include_str!("templates/flat_enum_from_binding_variant.jinja"),
    ),
    (
        "flat_enum_from_binding_impl_footer.jinja",
        include_str!("templates/flat_enum_from_binding_impl_footer.jinja"),
    ),
    (
        "flat_enum_from_binding_variant_unit.jinja",
        include_str!("templates/flat_enum_from_binding_variant_unit.jinja"),
    ),
    (
        "flat_enum_from_binding_variant_tuple.jinja",
        include_str!("templates/flat_enum_from_binding_variant_tuple.jinja"),
    ),
    (
        "enum_from_core_to_binding_impl.jinja",
        include_str!("templates/enum_from_core_to_binding_impl.jinja"),
    ),
    (
        "enum_from_core_to_binding_arm.jinja",
        include_str!("templates/enum_from_core_to_binding_arm.jinja"),
    ),
    (
        "enum_from_core_to_binding_catch_all.jinja",
        include_str!("templates/enum_from_core_to_binding_catch_all.jinja"),
    ),
    (
        "enum_from_binding_to_core_impl.jinja",
        include_str!("templates/enum_from_binding_to_core_impl.jinja"),
    ),
    (
        "enum_from_binding_to_core_arm.jinja",
        include_str!("templates/enum_from_binding_to_core_arm.jinja"),
    ),
    (
        "enum_from_binding_to_core_catch_all.jinja",
        include_str!("templates/enum_from_binding_to_core_catch_all.jinja"),
    ),
    (
        "json_vec_optional_preamble.jinja",
        include_str!("templates/json_vec_optional_preamble.jinja"),
    ),
    (
        "json_vec_required_preamble.jinja",
        include_str!("templates/json_vec_required_preamble.jinja"),
    ),
    (
        "named_let_optional_binding.jinja",
        include_str!("templates/named_let_optional_binding.jinja"),
    ),
    (
        "named_let_required_binding.jinja",
        include_str!("templates/named_let_required_binding.jinja"),
    ),
    (
        "serde_named_optional_binding.jinja",
        include_str!("templates/serde_named_optional_binding.jinja"),
    ),
    (
        "serde_named_required_binding.jinja",
        include_str!("templates/serde_named_required_binding.jinja"),
    ),
    (
        "async_param_clone_bytes_ref.jinja",
        include_str!("templates/async_param_clone_bytes_ref.jinja"),
    ),
    (
        "async_param_clone_path_ref.jinja",
        include_str!("templates/async_param_clone_path_ref.jinja"),
    ),
    (
        "async_param_clone_named_ref.jinja",
        include_str!("templates/async_param_clone_named_ref.jinja"),
    ),
    (
        "async_param_clone_native_struct_ref.jinja",
        include_str!("templates/async_param_clone_native_struct_ref.jinja"),
    ),
    (
        "async_param_clone_ref.jinja",
        include_str!("templates/async_param_clone_ref.jinja"),
    ),
    (
        "async_param_clone_value.jinja",
        include_str!("templates/async_param_clone_value.jinja"),
    ),
    (
        "registration_variant.rs.jinja",
        include_str!("templates/registration_variant.rs.jinja"),
    ),
    (
        "service_r_constructor.jinja",
        include_str!("templates/service_r_constructor.jinja"),
    ),
    (
        "service_r_configurator.jinja",
        include_str!("templates/service_r_configurator.jinja"),
    ),
    (
        "service_r_entrypoint.jinja",
        include_str!("templates/service_r_entrypoint.jinja"),
    ),
    (
        "service_r_registration.jinja",
        include_str!("templates/service_r_registration.jinja"),
    ),
    (
        "service_rs_handler_bridge.jinja",
        include_str!("templates/service_rs_handler_bridge.jinja"),
    ),
    (
        "service_rs_run_function_header.jinja",
        include_str!("templates/service_rs_run_function_header.jinja"),
    ),
    (
        "service_rs_registration_match_arm.jinja",
        include_str!("templates/service_rs_registration_match_arm.jinja"),
    ),
    (
        "service_rs_run_function_footer.jinja",
        include_str!("templates/service_rs_run_function_footer.jinja"),
    ),
    (
        "bridge_field_function.jinja",
        include_str!("templates/bridge_field_function.jinja"),
    ),
    (
        "json_struct_optional_preamble.jinja",
        include_str!("templates/json_struct_optional_preamble.jinja"),
    ),
    (
        "json_struct_required_preamble.jinja",
        include_str!("templates/json_struct_required_preamble.jinja"),
    ),
    (
        "r_unit_enum_wrapper.jinja",
        include_str!("templates/r_unit_enum_wrapper.jinja"),
    ),
    (
        "r_trait_bridge_roxygen.jinja",
        include_str!("templates/r_trait_bridge_roxygen.jinja"),
    ),
];

pub(crate) fn make_env() -> Environment<'static> {
    let mut env = Environment::new();
    env.set_trim_blocks(true);
    env.set_lstrip_blocks(true);
    env.set_keep_trailing_newline(true);
    for (name, src) in TEMPLATES {
        env.add_template(name, src).expect("built-in template is valid");
    }
    env
}

pub(crate) fn render(template_name: &str, ctx: minijinja::Value) -> String {
    let rendered = make_env()
        .get_template(template_name)
        .unwrap_or_else(|_| panic!("template {template_name} not found"))
        .render(ctx)
        .unwrap_or_else(|e| panic!("template {template_name} failed to render: {e}"));
    crate::core::keep_marker::strip_keep_markers(&rendered)
}

#[cfg(test)]
mod template_registration_tests {
    use super::TEMPLATES;
    use std::collections::HashSet;
    use std::path::Path;

    /// `render()` resolves names against `TEMPLATES`, not the filesystem, so a
    /// `.jinja` file added to `templates/` but never wired into this array compiles fine
    /// (`include_str!` only runs for entries that are listed) and panics only once an
    /// emitter reaches it at generation time. Compare by content rather than by
    /// registered key: some backends register a file under a shortened or aliased name,
    /// which is fine, but every file's bytes must appear in `TEMPLATES` somewhere. ~keep
    #[test]
    fn every_template_file_is_registered() {
        let templates_dir = Path::new(concat!(env!("CARGO_MANIFEST_DIR"), "/src/backends/extendr/templates"));
        let registered_contents: HashSet<&str> = TEMPLATES.iter().map(|(_, content)| *content).collect();

        let mut unregistered = Vec::new();
        collect_unregistered(templates_dir, templates_dir, &registered_contents, &mut unregistered);
        unregistered.sort();
        assert!(
            unregistered.is_empty(),
            "found .jinja file(s) in templates/ whose content is not registered in TEMPLATES: {unregistered:?}"
        );
    }

    fn collect_unregistered(
        root: &Path,
        dir: &Path,
        registered_contents: &HashSet<&str>,
        unregistered: &mut Vec<String>,
    ) {
        for entry in std::fs::read_dir(dir).expect("read templates directory") {
            let entry = entry.expect("read templates directory entry");
            let path = entry.path();
            if path.is_dir() {
                collect_unregistered(root, &path, registered_contents, unregistered);
                continue;
            }
            if path.extension().and_then(|ext| ext.to_str()) != Some("jinja") {
                continue;
            }
            let content = std::fs::read_to_string(&path).expect("read template file");
            if !registered_contents.contains(content.as_str()) {
                let relative = path
                    .strip_prefix(root)
                    .expect("template path under templates root")
                    .to_str()
                    .expect("template path is valid UTF-8")
                    .replace('\\', "/");
                unregistered.push(relative);
            }
        }
    }
}