Generate GitHub wiki table of contents

generate github wiki page toc.js

/**
 * This script generates a Markdown table of contents for a GitHub wiki page.
 * The end result is a block like this:
 * 
 *     ## Contents
 *     * [Header](#header)
 *       * [Subheader](#subheader)
 *         * [Sub-subheader](#sub-subheader)
 *         * [Sub-subheader 2](#sub-subheader-2)
 *     * [Header 2](#header-2)
 * 
 */

// find article headers
var headers = $('#wiki-body, .preview-content').find('h1, h2, h3, h4, h5');
var isPreview = !!$('.preview-content').length;

// find top header level (e.g., 2 if there are <h2> but no <h1> headers)
var minLevel = Math.min.apply(Math, headers.map(function() { return this.tagName.match(/\d/)[0]; }));

// build table of contents
var toc = '## Contents\n';
headers.map(function() {
	var header = $(this);
	var text = $.trim(header.text());
	var anchor = header.find('a:first').attr('id');
	if(isPreview)
		anchor = anchor.replace(/^user-content-/, '');
	var level = this.tagName.match(/\d/)[0] - minLevel + 1;

    for(var i = 1; i < level; i++)
       toc += '  ';
    toc += '* [' + text + '](#' + anchor + ')\n';
});

console.log(toc);