Personal blog written from scratch using Node.js, Bootstrap, and MySQL.
https://jrtechs.net
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278 lines
9.9 KiB
278 lines
9.9 KiB
const pandoc = require('node-pandoc');
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const utils = require('../utils/utils.js');
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const sql = require('../utils/sql');
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const argsFull = '--from markdown-markdown_in_html_blocks+raw_html --toc --toc-depth=3 -N --mathjax -t html5 --no-highlight';
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const argsPreview = '--mathjax -t html5';
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module.exports=
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{
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/**
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* Renders the entire blog post based on the sql data pulled
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* from the database.
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*
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* @param post sql data which has title, date, and header img location
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* @param blocks number of blocks to display for a preview or -1 for
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* all the blocks
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* @returns {Promise} async call which renders the entire blog post.
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*/
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generateBlogPost: function(post, blocks)
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{
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return new Promise(function(resolve, reject)
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{
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Promise.all([module.exports.generateBlogPostHeader(post),
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module.exports.generateBlogPostBody(post, blocks)])
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.then(function()
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{
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resolve(post);
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}).catch(function(error)
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{
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reject(error);
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})
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});
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},
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/**
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* Renders the header of the blog post which contains the header image, and date
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* published.
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*
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* @param post sql data
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* @returns {string}
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*/
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generateBlogPostHeader: function(post)
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{
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if(post.picture_url !== "n/a")
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post.hasPicture = true;
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post.published = post.published.toDateString();
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return;
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},
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/**
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* Method which renders the body of the blog post. This is responsible for getting
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* the contents of the markdown/latex file and rendering it into beautiful html.
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*
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* @param post stuff from the SQL table
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* @param blocks
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* @returns {Promise}
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*/
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generateBlogPostBody: function(post, blocks)
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{
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return new Promise(function(resolve, reject)
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{
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sql.getCategory(post.category_id).then(function(category)
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{
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module.exports.generateBlogPostComponent(category[0].url, post.url, blocks).then(function(html)
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{
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post.categoryURL = category[0].url;
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post.blogBody = html;
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resolve();
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});
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});
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})
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},
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/**
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* Decomposition from Generate Blog Post used for the
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* blog previewer.
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*
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* @param categoryURL
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* @param postURL
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* @param blocks
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* @returns {Promise}
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*/
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generateBlogPostComponent: function(categoryURL, postURL, blocks)
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{
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return new Promise(function(resolve, reject)
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{
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const pathName = "content/posts/" + categoryURL + "/"
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+ postURL + ".md";
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var markDown = utils.getFileContents(pathName).toString();
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markDown = markDown.split("(media/").join("(" + "../content/posts/"
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+ categoryURL + "/media/");
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module.exports.convertToHTML(markDown, blocks).then(function(result)
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{
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// hackey stuff to fix this open issue on pandoc https://github.com/jgm/pandoc/issues/3858
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//search for pattern <pre class="LANG"><code> and replace with <code class="language-LANG">
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var re = /\<pre class=".*?"><code>/;
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while (result.search(re) != -1)
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{
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var preTag = result.match(/\<pre class=".*?"><code>/g)[0];
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var finishIndex = preTag.split('"', 2).join('"').length;
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lang = preTag.substring(12, finishIndex);
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var newHTML = `<pre><code class="language-${lang}">`
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var original = `<pre class="${lang}"><code>`;
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result = result.split(original).join(newHTML);
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}
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result = result.split("<figcaption>").join("<figcaption style=\"visibility: hidden;\">");
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//this line prevents older versions of pandoc from including invalid cdm scripts
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result = result.split("<script src=\"https://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS_CHTML-full\" type=\"text/javascript\"></script>").join("");
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result = result.split("<script src=\"https://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML\" type=\"text/javascript\"></script>").join("");
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//stuff for youtube videos
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var re = /\<youtube .*?>/;
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//<youtube src="" />
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while (result.search(re) != -1)
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{
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var ytid = result.substring(result.search(re) + 14, result.search(re)+ 11 + 14);
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var youtubeHTML = `
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<div class="wrapper">
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<div class="youtube" data-embed="${ytid}">
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<div class="play-button"></div>
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</div>
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</div>`;
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var original = `<youtube src="${ytid}" />`;
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result = result.split(original).join(youtubeHTML);
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}
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var regExp = /\<customHTML .*?>/;
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while (result.search(regExp) != -1)
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{
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const pathName = "content/posts/" + categoryURL + "/html/"
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+ postURL + ".html";
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var htmlContent = utils.getFileContents(pathName).toString();
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result = result.split("<customHTML />").join(htmlContent);
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}
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if(blocks == -1)
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resolve(result);
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const htmlBlocks = result.split("<p>");
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var html = "";
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for(var i = 0; i < blocks; i++)
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{
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html += "<p>" + htmlBlocks[i];
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}
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resolve(html);
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}).catch(function(error)
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{
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reject(error);
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})
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})
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},
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/**
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* Converts markdown into html.
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*
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* @param markdownContents
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* @param type
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* @returns {Promise}
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*/
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convertToHTML: function(markdownContents, type)
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{
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if(type == -1)
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{
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return module.exports.pandocWrapper(markdownContents, argsFull);
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}
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else
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{
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return module.exports.pandocWrapper(markdownContents, argsFull);
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}
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},
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pandocWrapper: function(markdownContents, pandocArgs)
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{
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return new Promise((resolve, reject)=>
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{
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// Set your callback function
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callback = function (err, html)
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{
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if (err)
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{
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reject(err);
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}
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if(html === undefined)
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{
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resolve("");
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}
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else
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{
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html = html.split("<img").join("<img style=\"max-width: 100%;\" ");
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// html = html.split("<code>").join("<code class='hljs cpp'>");
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resolve(html);
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}
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};
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pandoc(markdownContents, pandocArgs, callback);
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});
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},
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/**
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* Renders a bunch of blog post previews to the user
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*
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* @param baseURL-- url of the page
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* @param posts -- sql data about the blog to render
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* @param currentPage -- the current page to render
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* @param numOfPosts -- number of blog to render
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* @returns {Promise} renders the html of the blog
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*/
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renderBatchOfPosts: function(baseURL, posts, currentPage, numOfPosts, templateContext)
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{
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if(typeof currentPage == "undefined")
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{
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currentPage = 1;
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}
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else
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{
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currentPage = Number(currentPage);
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}
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return new Promise(function(resolve, reject)
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{
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const promises = [];
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for(var i = (currentPage-1) * numOfPosts; i < (currentPage-1) * numOfPosts + numOfPosts; i++)
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{
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if(i < posts.length)
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{
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promises.push(new Promise(function(res, rej)
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{
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module.exports.generateBlogPost(posts[i], posts.length === 1 ? -1: 3).then(function(tempContext)
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{
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if(posts.length != 1)
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{
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templateContext.preview = true
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}
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res(tempContext);
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}).catch(function(error)
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{
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rej();
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})
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}));
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}
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}
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Promise.all(promises).then(function(posts)
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{
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templateContext.posts = posts;
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if(posts.length == 1)
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templateContext.title = posts[0].name;
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else if(currentPage != 1 && baseURL === "/")
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templateContext.title = "page " + currentPage;
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resolve();
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}).catch(function(error)
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{
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reject(error);
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});
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});
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}
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};
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