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Add Default trait impl for Lazy to enable struct field defaults #167

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7 changes: 7 additions & 0 deletions hypertext/src/alloc/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -312,6 +312,13 @@ impl<F: Fn(&mut Buffer<C>), C: Context> Debug for Lazy<F, C> {
}
}

impl<C: Context> Default for Lazy<fn(&mut Buffer<C>), C> {
#[inline]
fn default() -> Lazy<fn(&mut Buffer<C>), C> {
Lazy::dangerously_create(|_| ())
}
}

/// A value rendered via its [`Display`] implementation.
///
/// This will handle escaping special characters for you.
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45 changes: 44 additions & 1 deletion hypertext/tests/main.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -3,7 +3,7 @@

use std::fmt::{self, Display, Formatter};

use hypertext::{Buffer, Raw, maud_borrow, maud_static, prelude::*, rsx_borrow, rsx_static};
use hypertext::{Buffer, Lazy, Raw, maud_borrow, maud_static, prelude::*, rsx_borrow, rsx_static};

#[test]
fn readme() {
Expand Down Expand Up @@ -749,3 +749,46 @@ fn toggles() {
);
assert_eq!(rsx_result.as_inner(), r#"<input type="checkbox" checked>"#);
}

#[test]
fn derive_default() {
#[derive(Default)]
struct Element<'a> {
pub id: &'a str,
pub tabindex: u32,
pub children: Lazy<fn(&mut Buffer)>,
}

impl<'a> Renderable for Element<'a> {
fn render_to(&self, buf: &mut Buffer) {
rsx! {
<div id=(self.id) tabindex=(self.tabindex)>
(self.children)
</div>
}
.render_to(buf)
}
}

let with_children = rsx! {
<Element ..>
<h1>hello</h1>
</Element>
}
.render();

assert_eq!(
with_children.as_inner(),
r#"<div id="" tabindex="0"><h1>hello</h1></div>"#
);

let without_children = rsx! {
<Element ../>
}
.render();

assert_eq!(
without_children.as_inner(),
r#"<div id="" tabindex="0"></div>"#
);
}
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