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use anyhow::Result;
use cached::Return;
use cached::SizedCache;
use cached::proc_macro::cached;
use syntect::highlighting::Theme;
use syntect::html::highlighted_html_for_string;
use syntect::parsing::SyntaxSet;
#[cached(
type = "SizedCache<String, Return<String>>",
create = "{ SizedCache::with_size(100) }",
convert = r#"{ s.to_string() }"#,
with_cached_flag = true,
result = true,
)]
pub fn highlight(s: &str, theme: &Theme, ext: Option<&str>) -> Result<cached::Return<String>> {
let syntax_set = SyntaxSet::load_defaults_newlines();
log::trace!("Finding syntax for {:?}", ext);
let syntax = match ext {
Some(ext) => {
log::trace!("Trying by extension ({:?})", ext);
syntax_set.find_syntax_by_extension(ext)
.or_else(|| {
log::trace!("Trying by first line...");
syntax_set.find_syntax_by_first_line(s)
})
},
None => {
log::trace!("Trying by first line...");
syntax_set.find_syntax_by_first_line(s)
},
}
.unwrap_or_else(|| {
log::trace!("Using plaintext");
syntax_set.find_syntax_plain_text()
});
log::trace!("Found syntax for {:?} = {:?}", ext, syntax);
Ok(Return::new(highlighted_html_for_string(s, &syntax_set, &syntax, theme)))
}
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