custom front matter parser for showing errors + make all extras configurable from the page side

src/frontmatter.rs

@@ -0,0 +1,32 @@
+use serde::de::DeserializeOwned;
+
+/// Very basic YAML front matter parser.
+#[derive(Debug)]
+pub struct FrontMatter<T> {
+	/// The content past the front matter.
+	pub content: String,
+	/// The front matter found, if any.
+	pub data: Option<T>,
+}
+
+impl<T> FrontMatter<T>
+where
+	T: DeserializeOwned,
+{
+	/// Parses the given input for front matter.
+	pub fn parse(input: String) -> eyre::Result<Self> {
+		if input.starts_with("---\n") {
+			if let Some((frontmatter, content)) = input[3..].split_once("---\n") {
+				let data = serde_yml::from_str(frontmatter)?;
+				return Ok(Self {
+					content: content.to_string(),
+					data,
+				});
+			}
+		}
+		Ok(Self {
+			content: input,
+			data: None,
+		})
+	}
+}