#[derive (Debug, thiserror::Error, PartialEq)] pub enum Error { #[error ("File is too big to preview as Markdown")] TooBig, #[error ("File is not UTF-8")] NotUtf8, } fn render (bytes: &[u8], out: &mut String) -> Result <(), Error> { use pulldown_cmark::{Parser, Options, html}; let markdown_input = match std::str::from_utf8 (bytes) { Err (_) => return Err (Error::NotUtf8), Ok (x) => x, }; let mut options = Options::empty (); options.insert (Options::ENABLE_STRIKETHROUGH); let parser = Parser::new_ext (markdown_input, options); html::push_html (out, parser); Ok (()) } pub fn render_styled (bytes: &[u8]) -> Result { // Write to String buffer. let mut out = String::new (); out.push_str (""); render (bytes, &mut out)?; out.push_str (""); Ok (out) } #[cfg (test)] mod tests { #[test] fn markdown () { use super::*; for (input, expected) in vec! [ ("", ""), ( "Hello world, this is a ~~complicated~~ *very simple* example.", "

Hello world, this is a ~~complicated~~ very simple example.

\n" ), ].into_iter () { let mut out = String::default (); render (input.as_bytes (), &mut out).expect ("Markdown sample failed"); assert_eq! (expected, &out); } } }