// ==UserScript==
// @name         Go.dev Code Highlight
// @namespace    GolangDevNamespace
// @version      1.0
// @description  Golang code highlighter
// @author       Anton Vi
// @match        https://*.go.dev/*
// @require      https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.9.0/highlight.min.js
// @require      https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.9.0/languages/go.min.js
// @grant        GM_getResourceURL
// @license      GNU GPLv3
// @downloadURL none
// ==/UserScript==

(function() {
    'use strict';

    start();


})();


function start() {

    let css = 'pre code.hljs{display:block;overflow-x:auto;padding:1em}code.hljs{padding:3px 5px}.hljs{color:#abb2bf!important;background:#282c34}.hljs-comment,.hljs-quote{color:#5c6370;font-style:italic}.hljs-doctag,.hljs-formula,.hljs-keyword{color:#c678dd}.hljs-deletion,.hljs-name,.hljs-section,.hljs-selector-tag,.hljs-subst{color:#e06c75}.hljs-literal{color:#56b6c2}.hljs-addition,.hljs-attribute,.hljs-meta .hljs-string,.hljs-regexp,.hljs-string{color:#98c379}.hljs-attr,.hljs-number,.hljs-selector-attr,.hljs-selector-class,.hljs-selector-pseudo,.hljs-template-variable,.hljs-type,.hljs-variable{color:#d19a66}.hljs-bullet,.hljs-link,.hljs-meta,.hljs-selector-id,.hljs-symbol,.hljs-title{color:#61aeee}.hljs-built_in,.hljs-class .hljs-title,.hljs-title.class_{color:#e6c07b}.hljs-emphasis{font-style:italic}.hljs-strong{font-weight:700}.hljs-link{text-decoration:underline}';

    let style = document.createElement('style');
    let cssText = document.createTextNode(css);
    style.appendChild(cssText);
    document.head.appendChild(style);

    // loop pre-s
    let pre_s = document.getElementsByTagName('pre');
    for (let el of pre_s) {
        let text = el.innerHTML;

        el.innerHTML = '';

        let code = document.createElement('code');
        code.className = 'language-go';
        code.innerHTML = text;
        el.appendChild(code);
    }


    // load scripts with timeout
    setTimeout(() => {
        hljs.highlightAll();
    }, 100)
}