text: // ==UserScript==
  // @name           GitHub TOC Button
  // @name:ru        Кнопка оглавления для GitHub страницы
  // @namespace      https://spine3.org/gmscripts/
  // @description    Adds TOC button to GitHub page editor
  // @include        http://github.com/*/wiki/*/_edit*
  // @include        https://github.com/*/wiki/*/_edit*
  // @version        1.0.0
  // @author         Alexander Yevsyukov
  // @license        Creative Commons Attribution License
  // @grant          none
  // ==/UserScript==
  
  /*
   * This file is a Greasemonkey user script.
   *
   * To install it for Firefox, you need the "Greasemonkey" plugin
   * (URL: http://greasemonkey.mozdev.org/).
   *
   * After you installed the Greasemonkey extension, restart Firefox and revisit
   * this script. Now you will see a new menu item "Install User Script"
   * in your tools menu.
   *
   * To uninstall this script from Greasemonkey, go to your "Tools" menu and
   * select "Manage User Scripts", then select this script from the list
   * and click uninstall.
   *
   * To install it under Chrome, you need the "Tempermonkey" plugin:
   * (URL: http://tampermonkey.net/)
   *
   * To uninstall the script from Tempermonkey, click on the plug-in button in
   * the Chrome toolbar, then select "Dashboard" menu item. In the Dashbaord
   * check the item with the script and click on the trash icon on the left.
   *
   * This code is based on the script created by Tomancaklab.
   * See the original code at: http://tomancaklab.github.io/gfm-add-toc.user.js
   *
   * Creative Commons Attribution License:
   * http://creativecommons.org/licenses/by/2.5/
  */
  
  (function(){
    if (window.location.host != 'github.com' ||
        !window.location.pathname.match(/.*\/wiki\/.*\/_edit#?$/))
      return; // not editing a GitHub wiki page
  
    var textarea = document.getElementById('gollum-editor-body');
    var h1Button = document.getElementById('function-h1');
    if (!textarea || !h1Button) {
      console.log("Could not find text area or <h1> button");
      console.log(textarea);
      console.log(h1Button);
      return;
    }
  
    var self = this;
  
    var button = document.createElement('a');
    button.id = 'function-toc';
    button.href = '#';
    /* `button.className` changed according to StackOverflow advice:
       http://stackoverflow.com/questions/31844206/how-can-i-automatically-generate-tables-of-contents-in-a-github-wiki
       The original value was: 'minibutton function-button';
       Make sure the className value in `setTimeout()` is also the same.
     */
    button.className = 'btn btn-sm BtnGroup-item function-button';
    button.setAttribute('tabindex', '-1');
    button.setAttribute('title', 'Refresh table of contents');
    button.setAttribute('role', 'button');
    button.innerHTML = '<b>TOC</b>'
    button.onclick = function() {
      self.insertTOC(textarea);
    };
    h1Button.parentNode.insertBefore(button, h1Button);
  
    /* GitHub disables this button ;-) */
    /* Repeating the className with the same value as set above.
       The StackOverflow advice does not do this. */
    setTimeout(function() { button.className = 'btn btn-sm BtnGroup-item function-button'; }, 100);
  
    /* Helper to generate the Table of Contents entries */
    var toPlainText = function(list) {
      var result = '';
      list.forEach(function(el) {
        if (typeof(el) == 'string')
          result += el;
        else if (Array.isArray(el)) {
          if (el[0] == 'inlinecode' || el[0] == 'em')
            result += toPlainText(el.slice(1));
          else {
            console.log('Unhandled type: ' + el[0]);
            console.log(el);
          }
        }
      });
      return result;
    };
  
    this.insertTOC = function(textarea) {
      if (!textarea) {
        console.log('No markdown editor found!');
        return;
      }
  
      /* Obtain markdown from Edit box */
      var md = textarea.value;
  
      /* Strip out existing TOC, if any */
      // Value changed according to StackOverflow advice:
      //  http://stackoverflow.com/questions/31844206/how-can-i-automatically-generate-tables-of-contents-in-a-github-wiki
      var tocStart = '**Table of contents**\n\n';
      if (md.startsWith(tocStart))
        md = md.substring(tocStart.length).replace(/[^]*?\n\n/m, '');
  
      /* Generate the Table of Contents */
      var parsed = window.markdown.parse(md);
      var toc = tocStart;
      parsed.forEach(function(el) {
        if (Array.isArray(el) &&
            el[0] == 'header' &&
            !(    el.length > 2 &&
                  !!el[2].startsWith &&
                  el[2].startsWith('!/bin/'))
        ) {
          for (var i = 1; i < el[1].level; i++)
            toc += '\t';
          var plainText = toPlainText(el.slice(2));
          var anchor = plainText.toLowerCase()
            .replace(/ /g, '-')
            .replace(/[^-A-Za-z0-9]/g, '');
          toc += '* [' + plainText + '](#' + anchor + ')\n';
        }
      });
      toc += '\n';
  
      /* Insert the Table of Contents */
      textarea.value = toc + md;
    };
  
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e=a.match(/^\{:\s*((?:\\\}|[^\}])*)\s*\}/);if(!e)return[2,"{:"];var f=this.dialect.processMetaHash(e[1]),g=o(d);g||(g={},d.splice(1,0,g));for(var h in f)g[h]=f[h];return[e[0].length,""]},m.dialects.Maruku=u,m.dialects.Maruku.inline.__escape__=/^\\[\\`\*_{}\[\]()#\+.!\-|:]/,m.buildBlockOrder(m.dialects.Maruku.block),m.buildInlinePatterns(m.dialects.Maruku.inline),a.Markdown=m,a.parse=m.parse,a.toHTML=m.toHTML,a.toHTMLTree=m.toHTMLTree,a.renderJsonML=m.renderJsonML}(function(){return window.markdown={},window.markdown}());
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