Refactor

crates/service/service-webpage/src/components/md.rs

@@ -3,11 +3,13 @@ use markdown_it::parser::block::{BlockRule, BlockState};
 use markdown_it::parser::core::Root;
 use markdown_it::parser::inline::{InlineRule, InlineState};
 use markdown_it::{MarkdownIt, Node, NodeValue, Renderer};
-use maud::{Markup, PreEscaped, Render};
+use maud::{Markup, PreEscaped, Render, html};
+use page::{Page, PageMetadata};
 use std::str::FromStr;
 
 use crate::components::fa::FAIcon;
 use crate::components::mangle::{MangledBetaEmail, MangledGoogleEmail};
+use crate::components::misc::Backlinks;
 
 lazy_static! {
 	static ref MdParser: MarkdownIt = {
@@ -38,6 +40,58 @@ impl Markdown<'_> {
 	}
 }
 
+//
+// MARK: helpers
+//
+
+/// Try to read page metadata from a markdown file's frontmatter.
+/// - returns `none` if there is no frontmatter
+/// - returns an error if we fail to parse frontmatter
+pub fn meta_from_markdown(root_node: &Node) -> Result<Option<PageMetadata>, serde_yaml::Error> {
+	root_node
+		.children
+		.first()
+		.and_then(|x| x.cast::<FrontMatter>())
+		.map(|x| serde_yaml::from_str::<PageMetadata>(&x.content))
+		.map_or(Ok(None), |v| v.map(Some))
+}
+
+pub fn page_from_markdown(md: impl Into<String>, default_image: Option<String>) -> Page {
+	let md: String = md.into();
+	let md = Markdown::parse(&md);
+
+	let mut meta = meta_from_markdown(&md)
+		.unwrap_or(Some(PageMetadata {
+			title: "Invalid frontmatter!".into(),
+			..Default::default()
+		}))
+		.unwrap_or_default();
+
+	if meta.image.is_none() {
+		meta.image = default_image
+	}
+
+	let html = PreEscaped(md.render());
+
+	Page {
+		meta,
+		generate_html: Box::new(move |page, _| {
+			let html = html.clone();
+			Box::pin(async move {
+				html! {
+					@if let Some(slug) = &page.meta.slug {
+						(Backlinks(&[("/", "home")], slug))
+					}
+
+					(html)
+				}
+			})
+		}),
+
+		..Default::default()
+	}
+}
+
 //
 // MARK: extensions
 //