website/src/hilighting.rs

use syntect::{highlighting::ThemeSet, parsing::SyntaxSet};
use tracing::{error, instrument};

#[instrument(skip(content, lang, theme))]
pub fn hilight(content: &str, lang: &str, theme: Option<&str>) -> anyhow::Result<String> {
    let ss = SyntaxSet::load_defaults_newlines();
    let s = ss
        .find_syntax_by_extension(lang)
        .or_else(|| ss.find_syntax_by_name(lang))
        .unwrap_or_else(|| {
            error!("Syntax not found for language: {}", lang);
            ss.find_syntax_plain_text()
        });
    let ts = ThemeSet::load_defaults();
    let theme = if let Some(t) = theme {
        ts.themes
            .get(t)
            .unwrap_or_else(|| ts.themes.first_key_value().unwrap().1)
    } else {
        ts.themes.first_key_value().unwrap().1
    }; // TODO

    let res = syntect::html::highlighted_html_for_string(content, &ss, s, theme)?;
    Ok(res)
}