src/components/async_fetch.rs


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macro_rules! AsyncResource {
    (
        (
            $(
                $input_name:ident : $input_type:ty = $input:expr
            ),*
        ) -> $output:ty $fetcher:block
    ) => {{
        async fn fetcher($($input_name : $input_type),*) -> $output $fetcher

        leptos::prelude::LocalResource::new(move || fetcher($($input),*))
    }}
}
pub(crate) use AsyncResource;

macro_rules! AsyncFetch {
    (
        @map_error_in_producer
        fetcher = $fetcher:expr,
        producer = $producer:expr $(,)?
    ) => {{
        AsyncFetch! {
            @map_error_in_producer
            from_resource = leptos::prelude::LocalResource::new(move || $fetcher),
            producer = $producer
        }
    }};

    (
        @map_error_in_producer
        from_resource = $resource:expr,
        producer = $producer:expr $(,)?
    ) => {{
        use leptos::prelude::{ElementChild, Suspend, Transition};

        leptos::view! {
            <Transition fallback=|| {
                view! { <p>"Loading..."</p> }
            }>
                {move || Suspend::new(async move {
                    $resource
                        .await
                        .map($producer)
                })}
            </Transition>
        }
    }};
}
pub(crate) use AsyncFetch;