filigree 0.4.1

//! Utilities for working with Maud

use maud::{Markup, Render};

/// A lazy renderer for Maud templates. Use with the [maud_lazy] macro.
pub struct Lazy<F>
where
    F: Fn() -> Markup,
{
    /// The function that will render the markup
    pub contents: F,
}

/// Render a maud template lazily
///
/// ```
/// # use maud::{PreEscaped, Render};
/// # use filigree::maud_lazy;
/// let value = "hello";
/// let lazy = maud_lazy! {
///     p { (value) " world" }
/// };
/// assert_eq!(lazy.render().0, "<p>hello world</p>");
/// ```
///
/// You can also create a move closure if you need to.
///
/// ```
/// # use maud::{PreEscaped, Render};
/// # use filigree::maud_lazy;
/// let value = "hello";
/// let lazy = maud_lazy! { move
///     p { (value) " world" }
/// };
/// assert_eq!(lazy.render().0, "<p>hello world</p>");
/// ```
#[macro_export]
macro_rules! maud_lazy {
    (move $($ex: tt)*) => {
        $crate::maud::Lazy {
            contents: move || maud::html! { $($ex)* },
        }
    };

    ($($ex: tt)*) => {
        $crate::maud::Lazy {
            contents: || maud::html! { $($ex)* },
        }
    };

}

impl<F> Render for Lazy<F>
where
    F: Fn() -> Markup,
{
    fn render_to(&self, buf: &mut String) {
        (self.contents)().render_to(buf);
    }
}