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69 lines
2.2 KiB
JavaScript
69 lines
2.2 KiB
JavaScript
/* global hexo */
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const Prism = require('prismjs')
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const entities = require('he')
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const { promisify } = require('util')
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const readFile = promisify(require('fs').readFile)
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const path = require('path')
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// oof
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// I think this is the way to add Prism components that it doesn't include
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// in the default build?
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global.Prism = Prism
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// the / is needed to force it to resolve to the directory
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require('prismjs/components/')()
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delete global.Prism
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const unhighlightedCodeRx = /<pre><code class="([^"]*)?">([\s\S]*?)<\/code><\/pre>/igm
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function highlight (lang, code) {
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const startTag = `<figure class="highlight ${lang}"><table><tr><td class="code"><pre>`
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const endTag = '</pre></td></tr></table></figure>'
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let parsedCode = ''
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if (Prism.languages[lang]) {
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parsedCode = Prism.highlight(code, Prism.languages[lang])
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} else {
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parsedCode = code
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}
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return startTag + parsedCode + endTag
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}
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function prismify (data) {
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data.content = data.content.replace(unhighlightedCodeRx,
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(_, lang, code) => highlight(lang, entities.decode(code)))
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data.excerpt = data.excerpt.replace(unhighlightedCodeRx,
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(_, lang, code) => highlight(lang, entities.decode(code)))
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return data
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}
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function code (args, content) {
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let lang = ''
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if (args[0].startsWith('lang:')) {
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lang = args.shift().replace(/^lang:/, '')
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}
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return highlight(lang, content)
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}
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async function includeCode (args) {
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let lang = ''
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if (args[0].startsWith('lang:')) {
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lang = args.shift().replace(/^lang:/, '')
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}
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const file = path.join(hexo.source_dir, hexo.config.code_dir, args.join(' '))
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const content = await readFile(file, 'utf8')
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return highlight(lang, content.trim())
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}
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// Highlight as many things as we possibly can
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hexo.extend.tag.register('code', code, true)
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hexo.extend.tag.register('codeblock', code, true)
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hexo.extend.tag.register('include_code', includeCode, { async: true })
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hexo.extend.tag.register('include-code', includeCode, { async: true })
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// Hexo includes its own code block handling by default which may
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// cause the above to miss some things, so do another pass when the page
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// is done rendering to pick up any code blocks we may have missed.
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hexo.extend.filter.register('after_post_render', prismify)
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