Personal blog written from scratch using Node.js, Bootstrap, and MySQL. https://jrtechs.net
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const pandoc = require('node-pandoc');
const utils = require('../utils/utils.js');
const sql = require('../utils/sql');
const argsFull = '-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),
module.exports.generateBlogPostFooter()]).then(function(content)
{
resolve(content.join(''));
}).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)
{
var htmlHead = "<div class=\"blogPost\">";
//image
if(!(post.picture_url === "n/a"))
{
htmlHead +="<img src=\"/blogContent/headerImages/" + post.picture_url +
"\" alt=\"\" style=\"width:100%; height:10%\">";
}
htmlHead += "<div class=\"p-4\"><div class=\"\">";
//title
htmlHead += "<h3><b>" + post.name + "</b></h3>";
//date
htmlHead += "<h5><span class=\"w3-opacity\">" +
post.published.toDateString() + "</span></h5>";
htmlHead +="</div>" + "<div class=\"\">";
return htmlHead;
},
/**
* 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)
{
resolve(module.exports.generateBlogPostComponent(category[0].url, post.url, blocks));
});
})
},
/**
* 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("<figcaption>").join("<figcaption style=\"visibility: hidden;\">");
//this line prevents older versions of pandoc from including invalid cdm scripts
result = result.split("<script src=\"https://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS_CHTML-full\" type=\"text/javascript\"></script>").join("");
result = result.split("<script src=\"https://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML\" type=\"text/javascript\"></script>").join("");
//stuff for youtube videos
var re = /\<youtube .*?>/;
//<youtube src="" />
while (result.search(re) != -1)
{
var ytid = result.substring(result.search(re) + 14, result.search(re)+ 11 + 14);
var youtubeHTML = "<div class=\"wrapper\">\n" +
"\t<div class=\"youtube\" data-embed=\"" +
ytid +
"\" />\n" +
"\t\t<div class=\"play-button\"></div>\n" +
"\t</div>\n" +
"</div>\n";
var original = "<youtube src=\"" + ytid + "\" />";
result = result.split(original).join(youtubeHTML);
}
if(blocks == -1)
resolve(result);
const htmlBlocks = result.split("<p>");
var html = "";
for(var i = 0; i < blocks; i++)
{
html += "<p>" + htmlBlocks[i];
}
html += " <div style=\"\">\n" +
" <p class='text-center'><button class=\"btn btn-secondary btn-lg " +
"w3-padding-large w3-white w3-border\" onclick=\"location.href='" +
"http://jrtechs.net/" + categoryURL + "/" + postURL +
"'\"><b>READ MORE &raquo;</b></button></p>\n" +
" </div>\n";
resolve(html);
}).catch(function(error)
{
reject(error);
})
})
},
/** Method to return the footer of the html blog post.
*
* @returns {string}
*/
generateBlogPostFooter: function()
{
return "</div></div></div><br><br>";
},
/**
* 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("<img").join("<img style=\"max-width: 100%;\" ");
html = html.split("<code>").join("<code class='hljs cpp'>");
resolve(html);
};
if(type == -1)
{
pandoc(markdownContents, argsFull, callback);
}
else
{
pandoc(markdownContents, argsPreview, callback);
}
});
},
}