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import visit from 'unist-util-visit';

import hljs from 'highlight.js/lib/highlight';

import xml from 'highlight.js/lib/languages/xml';

import python from 'highlight.js/lib/languages/python';

import javascript from 'highlight.js/lib/languages/javascript';

import json from 'highlight.js/lib/languages/json';

import java from 'highlight.js/lib/languages/java';

import objectivec from 'highlight.js/lib/languages/objectivec';

import swift from 'highlight.js/lib/languages/swift';

import bash from 'highlight.js/lib/languages/bash';

hljs.registerLanguage('python', python);

hljs.registerLanguage('xml', xml);

hljs.registerLanguage('javascript', javascript);

hljs.registerLanguage('json', json);

hljs.registerLanguage('objc', objectivec);

hljs.registerLanguage('swift', swift);

hljs.registerLanguage('java', java);

hljs.registerLanguage('bash', bash);

/**

* Adapted from remark-highlight.js

* https://github.com/ben-eb/remark-highlight.js

*/

export default function attacher() {

function visitor(node) {

if (node.lang) {

node.type = 'html';

node.value = `<pre class='hljs'>${hljs.highlightAuto(node.value, [node.lang]).value}</pre>`;

}

}

return ast => visit(ast, 'code', visitor);

}