hexo.extend.filter.register('stylus:renderer', function (style) {
    const {config, theme} = this;
    const data = hexo.locals.get('data');

    style.define('$about', data && data.about ? Object.keys(data.about) : false);
    style.define('$link', !!(data && data.links) || !!(data && data.tlink))
    style.define('$equipment', !!(data && data.equipment))

    // highlight
    const {syntax_highlighter: syntaxHighlighter, highlight, prismjs} = hexo.config
    let {enable: highlightEnable, line_number: highlightLineNumber} = highlight
    let {enable: prismjsEnable, line_number: prismjsLineNumber} = prismjs

    // for hexo > 7.0
    if (syntaxHighlighter) {
        highlightEnable = syntaxHighlighter === 'highlight.js'
        prismjsEnable = syntaxHighlighter === 'prismjs'
    }

    style.define('$highlight_enable', highlightEnable)
    style.define('$highlight_line_number', highlightLineNumber)
    style.define('$prismjs_enable', prismjsEnable)
    style.define('$prismjs_line_number', prismjsLineNumber)
});