const pandoc = require('node-pandoc'); const utils = require('../utils/utils.js'); const sql = require('../utils/sql'); const argsFull = '--from markdown-markdown_in_html_blocks+raw_html -S --base-header-level=1 --toc --toc-depth=3 -N --normalize -s --mathjax -t html5'; const argsPreview = '-S --normalize -s --mathjax -t html5'; module.exports= { /** * Renders the entire blog post based on the sql data pulled * from the database. * * @param post sql data which has title, date, and header img location * @param blocks number of blocks to display for a preview or -1 for * all the blocks * @returns {Promise} async call which renders the entire blog post. */ generateBlogPost: function(post, blocks) { return new Promise(function(resolve, reject) { Promise.all([module.exports.generateBlogPostHeader(post), module.exports.generateBlogPostBody(post, blocks)]) .then(function() { resolve(post); }).catch(function(error) { reject(error); }) }); }, /** * Renders the header of the blog post which contains the header image, and date * published. * * @param post sql data * @returns {string} */ generateBlogPostHeader: function(post) { if(post.picture_url !== "n/a") post. hasPicture = true; post.published = post.published.toDateString(); return; }, /** * Method which renders the body of the blog post. This is responsible for getting * the contents of the markdown/latex file and rendering it into beautiful html. * * @param post stuff from the SQL table * @param blocks * @returns {Promise} */ generateBlogPostBody: function(post, blocks) { return new Promise(function(resolve, reject) { sql.getCategory(post.category_id).then(function(category) { module.exports.generateBlogPostComponent(category[0].url, post.url, blocks).then(function(html) { post.blogBody = html; resolve(); }); }); }) }, /** * Decomposition from Generate Blog Post used for the * blog previewer. * * @param categoryURL * @param postURL * @param blocks * @returns {Promise} */ generateBlogPostComponent: function(categoryURL, postURL, blocks) { return new Promise(function(resolve, reject) { const pathName = "blogContent/posts/" + categoryURL + "/" + postURL + ".md"; var markDown = utils.getFileContents(pathName).toString(); markDown = markDown.split("(media/").join("(" + "../blogContent/posts/" + categoryURL + "/media/"); module.exports.convertToHTML(markDown, blocks).then(function(result) { result = result.split("
").join("
"); //this line prevents older versions of pandoc from including invalid cdm scripts result = result.split("").join(""); result = result.split("").join(""); //stuff for youtube videos var re = /\/; // while (result.search(re) != -1) { var ytid = result.substring(result.search(re) + 14, result.search(re)+ 11 + 14); var youtubeHTML = "
\n" + "\t
\n" + "\t\t
\n" + "\t
\n" + "
\n"; var original = ""; result = result.split(original).join(youtubeHTML); } var regExp = /\/; while (result.search(regExp) != -1) { const pathName = "blogContent/posts/" + categoryURL + "/html/" + postURL + ".html"; var htmlContent = utils.getFileContents(pathName).toString(); result = result.split("").join(htmlContent); } if(blocks == -1) resolve(result); const htmlBlocks = result.split("

"); var html = ""; for(var i = 0; i < blocks; i++) { html += "

" + htmlBlocks[i]; } html += "

\n" + "

\n" + "
\n"; resolve(html); }).catch(function(error) { reject(error); }) }) }, /** * Converts markdown into html. * * @param markdownContents * @param type * @returns {Promise} */ convertToHTML: function(markdownContents, type) { return new Promise(function(resolve, reject) { // Set your callback function callback = function (err, html) { if (err) { reject(err); } html = html.split("").join(""); resolve(html); }; if(type == -1) { pandoc(markdownContents, argsFull, callback); } else { pandoc(markdownContents, argsPreview, callback); } }); }, /** * Renders a bunch of blog post previews to the user * * @param baseURL-- url of the page * @param posts -- sql data about the blog to render * @param currentPage -- the current page to render * @param numOfPosts -- number of blog to render * @returns {Promise} renders the html of the blog */ renderBatchOfPosts: function(baseURL, posts, currentPage, numOfPosts, templateContext) { if(typeof currentPage == "undefined") { currentPage = 1; } else { currentPage = Number(currentPage); } return new Promise(function(resolve, reject) { const promises = []; for(var i = (currentPage-1) * numOfPosts; i < (currentPage-1) * numOfPosts + numOfPosts; i++) { if(i < posts.length) { promises.push(new Promise(function(res, rej) { module.exports.generateBlogPost(posts[i], posts.length === 1 ? -1: 3).then(function(tempContext) { res(tempContext); }).catch(function(error) { rej(); }) })); } } //promises.push(require('../blog/renderNextBar').main(baseURL, currentPage, numOfPosts, blog.length)); Promise.all(promises).then(function(posts) { templateContext.posts = posts; resolve(); }).catch(function(error) { reject(error); }); }); } };