Tags - john mcparland

Just another little update to the site. Added tags to posts! Check them out in the head of each post.

There’s also some more polish all around.

A 404 page
A link back to the top of the page
Image labels

Put a label on this cat.

You do it with this syntax which is apparently part of Markdown.

![](/static/embeds/2023-08-22_tags/cat.webp 'Put a label on this cat.')

This required hooking into how pulldown-cmark handles tags, which is only a little awkward. There’s no built-in way to do so, but working with Rust iterators makes it easy to turn image tags into raw html tags. Note how the match turns all Event::Start(Tag::Image) into Event::Html.

fn parse_markdown_custom<'a, I: Iterator<Item = pulldown_cmark::Event<'a>>>(
	iter: I,
) -> impl Iterator<Item = pulldown_cmark::Event<'a>> {
	use pulldown_cmark::{CowStr, Event, Tag};
	iter.map(|event| match event {
		Event::Start(Tag::Image(_link_type, url, title)) => {
			let v = html! {
				img src=(url) title=(title);
				@if title.as_ref().trim().len() > 0 {
					p class="markdown-image-title" { (title) }
				}
			};
			Event::Html(CowStr::from(v.0))
		}
		v => v,
	})
}