Personal blog written from scratch using Node.js, Bootstrap, and MySQL.
https://jrtechs.net
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210 lines
7.2 KiB
210 lines
7.2 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 = '-S --base-header-level=1 --toc --toc-depth=3 -N --normalize -s --mathjax -t html5';
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const argsPreview = '-S --normalize -s --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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module.exports.generateBlogPostFooter()]).then(function(content)
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{
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resolve(content.join(''));
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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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var htmlHead = "<div class=\"blogPost\">";
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//image
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if(!(post.picture_url === "n/a"))
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{
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htmlHead +="<img src=\"/blogContent/headerImages/" + post.picture_url +
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"\" alt=\"\" style=\"width:100%; height:10%\">";
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}
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htmlHead += "<div class=\"p-4\"><div class=\"\">";
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//title
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htmlHead += "<h3><b>" + post.name + "</b></h3>";
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//date
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htmlHead += "<h5><span class=\"w3-opacity\">" +
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post.published.toDateString() + "</span></h5>";
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htmlHead +="</div>" + "<div class=\"\">";
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return htmlHead;
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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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resolve(module.exports.generateBlogPostComponent(category[0].url, post.url, blocks));
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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 = "blogContent/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("(" + "../blogContent/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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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 = "<div class=\"wrapper\">\n" +
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"\t<div class=\"youtube\" data-embed=\"" +
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ytid +
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"\" />\n" +
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"\t\t<div class=\"play-button\"></div>\n" +
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"\t</div>\n" +
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"</div>\n";
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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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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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html += " <div style=\"\">\n" +
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" <p class='text-center'><button class=\"btn btn-secondary btn-lg " +
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"w3-padding-large w3-white w3-border\" onclick=\"location.href='" +
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"http://jrtechs.net/" + categoryURL + "/" + postURL +
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"'\"><b>READ MORE »</b></button></p>\n" +
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" </div>\n";
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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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/** Method to return the footer of the html blog post.
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*
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* @returns {string}
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*/
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generateBlogPostFooter: function()
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{
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return "</div></div></div><br><br>";
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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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return new Promise(function(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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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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if(type == -1)
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{
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pandoc(markdownContents, argsFull, callback);
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}
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else
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{
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pandoc(markdownContents, argsPreview, callback);
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}
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});
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},
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}
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