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Fast and extensible Markdown for Elixir

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mdex native comrak_nif src autumnus_adapter.rs
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native/comrak_nif/src/autumnus_adapter.rs 

use autumnus::formatter::HtmlFormatterBuilder;

use autumnus::languages::Language;

use autumnus::FormatterOption;

use comrak::adapters::SyntaxHighlighterAdapter;

use std::collections::HashMap;

use std::io::{self, Write};



#[derive(Default)]

pub struct AutumnusAdapter<'a> {

    formatter: FormatterOption<'a>,

}



impl<'a> AutumnusAdapter<'a> {

    pub fn new(formatter: FormatterOption<'a>) -> Self {

        Self { formatter }

    }

}



impl SyntaxHighlighterAdapter for AutumnusAdapter<'_> {

    fn write_pre_tag(

        &self,

        output: &mut dyn Write,

        _attributes: HashMap<String, String>,

    ) -> io::Result<()> {

        let html_formatter = HtmlFormatterBuilder::new()

            .with_formatter(self.formatter)

            .build();



        html_formatter.open_pre_tag(output)?;



        Ok(())

    }



    fn write_code_tag(

        &self,

        output: &mut dyn Write,

        attributes: HashMap<String, String>,

    ) -> io::Result<()> {

        let plaintext = "language-plaintext".to_string();

        let language = attributes.get("class").unwrap_or(&plaintext);

        let split: Vec<&str> = language.split('-').collect();

        let language = split.get(1).unwrap_or(&"plaintext");

        let lang: Language = Language::guess(language, "");



        let html_formatter = HtmlFormatterBuilder::new()

            .with_formatter(self.formatter)

            .with_lang(lang)

            .build();



        html_formatter.open_code_tag(output)?;



        Ok(())

    }



    fn write_highlighted(

        &self,

        output: &mut dyn Write,

        lang: Option<&str>,

        source: &str,

    ) -> io::Result<()> {

        let lang: Language = Language::guess(lang.unwrap_or("plaintext"), source);



        let html_formatter = HtmlFormatterBuilder::new()

            .with_formatter(self.formatter)

            .with_lang(lang)

            .with_source(source)

            .build();



        html_formatter.highlights(output)?;



        Ok(())

    }

}