User script to fix missing examples on Apache Camel Docs - use with e.g. Tampermonkey

Fix Apache Camel Docs Snippets.user.js

// ==UserScript==
// @name         Fix Apache Camel Docs Snippets
// @namespace    http://netresearch.de/
// @version      0.1
// @description  Fix missing examples on Apache Camel Docs
// @author       Christian Opitz
// @include      http://camel.apache.org/*
// @include      https://raw.githubusercontent.com/apache/camel/master/*
// @require      http://camel.apache.org/styles/highlighter/scripts/shCore.js
// @require      http://camel.apache.org/styles/highlighter/scripts/shBrushJava.js
// @require      http://camel.apache.org/styles/highlighter/scripts/shBrushXml.js
// @require      http://camel.apache.org/styles/highlighter/scripts/shBrushPlain.js
// @resource     shCoreCamel http://camel.apache.org/styles/highlighter/styles/shCoreCamel.css
// @resource     shThemeCamel http://camel.apache.org/styles/highlighter/styles/shThemeCamel.css
// @grant        GM_addStyle
// @grant        GM_getResourceText
// @grant        GM_xmlhttpRequest
// ==/UserScript==

(function() {
    'use strict';
    GM_addStyle(GM_getResourceText("shCoreCamel"));
    GM_addStyle(GM_getResourceText("shThemeCamel"));
    GM_addStyle(
        '.camel-snippet { border: 1px dashed #3c78b5; margin: 1em 0; position: relative; } ' +
        '.camel-snippet .syntaxhighlighter { padding: 10px 5px; box-sizing: border-box; margin: 0 !important; } ' +
        '.camel-snippet > a { position: absolute; top: 0; right: 5px; }'
    );

    var urls = {};
    var remaining = 0;
    function resolveSnippet(element, config, source) {
        var regexp = new RegExp('START SNIPPET:\\s+' + config.id + '(\\n|.)+END SNIPPET:\\s+' + config.id);
        var match = regexp.exec(source);
        var href = "https://github.com/apache/camel/blob/master/" + config.path;
        var wrapper = document.createElement('div');
        wrapper.classList.add('camel-snippet');
        if (match) {
            href += "#L" + ((source.substring(0, match.index).match(/\n/g) || []).length + 2);
            var lines = match[0].split("\n");
            lines.shift();
            lines.pop();
            var indention;
            for (var l = 0; l < lines.length; l++) {
                var line = lines[l].replace(/\t/, '    ');
                if (l === 0) {
                    var indentionMatch = /^(\s+)/.exec(line);
                    if (indentionMatch) {
                        indention = new RegExp('^' + indentionMatch[1]);
                    }
                }
                if (indention) {
                    lines[l] = line.replace(indention, '');
                }
            }

            var code = document.createElement('pre');
            wrapper.appendChild(code);
            code.setAttribute('class', 'gutter: false toolbar: false brush: ' + config.lang);
            code.innerText = lines.join("\n");
            code.innerHTML = code.innerHTML.replace(/<br\s*\/?>/g, "\n");
        } else {
            var error = document.createElement('div');
            error.innerText = "Could not find snippet " + config.id + " on " + config.url;
            error.classList.add('camel-snippet-error');
            wrapper.appendChild(innerText);
        }
        var link = document.createElement('a');
        link.setAttribute('href', href);
        link.setAttribute('target', '_blank');
        link.setAttribute('title', 'Open source file');
        link.innerText = '↗';
        wrapper.appendChild(link);
        element.parentNode.insertBefore(wrapper, element);
        element.parentNode.removeChild(element);
    }
    function loadSnippet(element, config) {
        if (!config.url || config.url.substr(0, 12) !== 'camel/trunk/' || !config.id) {
            return;
        }
        config.path = config.url.substr(12);
        remaining++;
        if (urls[config.url]) {
            urls[config.url].push({element: element, config: config});
            return;
        }
        urls[config.url] = [{element: element, config: config}];

        GM_xmlhttpRequest({
            method: "GET",
            url: "https://raw.githubusercontent.com/apache/camel/master/" + config.path,
            onload: function(response) {
                if (response.status === 200) {
                    for (var i = 0; i < urls[config.url].length; i++) {
                        remaining--;
                        resolveSnippet(urls[config.url][i].element, urls[config.url][i].config, response.responseText);
                    }
                } else {
                    console.log("Error", response);
                }
                if (!remaining) {
                    SyntaxHighlighter.all();
                }
            }
        });
    }

    var codeElements = document.querySelectorAll('plain-text-body');
    for (var i = 0; i < codeElements.length; i++) {
        var codeElement = codeElements[i];
        var snippet = codeElement.innerText;
        if (snippet.substr(0, 9) === '{snippet:') {
            var config = {};
            var parts = snippet.substring(9, snippet.length - 1).split('|');
            for (var j = 0; j < parts.length; j++) {
                var part = parts[j];
                var equalsPos = part.indexOf('=');
                if (equalsPos > 0) {
                    config[part.substr(0, equalsPos)] = part.substr(equalsPos + 1);
                }
            }
            loadSnippet(codeElement, config);
        }
    }
})();