{"id":4124,"date":"2016-08-27T15:30:16","date_gmt":"2016-08-27T23:30:16","guid":{"rendered":"https:\/\/blog.mozilla.org\/webdev\/?p=4124"},"modified":"2016-08-27T15:30:16","modified_gmt":"2016-08-27T23:30:16","slug":"beer-and-tell-august-2016","status":"publish","type":"post","link":"https:\/\/blog.mozilla.org\/webdev\/2016\/08\/27\/beer-and-tell-august-2016\/","title":{"rendered":"Beer and Tell – August 2016"},"content":{"rendered":"

Once a month, web developers from across the Mozilla Project get together to talk about our side projects and drink, an occurrence we like to call “Beer and
\nTell”.<\/p>\n

There’s a wiki page available<\/a> with a list of the presenters, as well as links to their presentation materials. There’s also a recording available<\/a> courtesy of Air Mozilla.<\/p>\n

Osmose: PyJEXL<\/h2>\n

First up was Osmose<\/a> (that’s me!), who shared PyJEXL<\/a>, an implementation of JEXL<\/a> in Python. JEXL is an expression language based on JavaScript that computes the value of an expression when applied to a given context. For example, the statement 2 + foo<\/code>, when applied to a context where foo<\/code> is 7, evaluates to 9. JEXL also allows for defining custom functions and operators to be used in expressions.<\/p>\n

JEXL is implemented as a JavaScript library; PyJEXL allows you to parse and evaluate JEXL expressions in Python, as well as analyze and validate expressions.<\/p>\n

pmac: rtoot.org<\/h2>\n

Next up was pmac<\/a>, who shared rtoot.org<\/a>, the website for “The Really Terrible Orchestra of the Triangle”. It’s a static site for pmac’s local orchestra built using lektor<\/a>, an easy-to-use static site generator. One of the more interesting features pmac highlighted was lektor’s data model<\/a>. He showed a lektor plugin<\/a> he wrote that added support for CSV fields as part of the data model, and used it to describe the orchestra’s rehearsal schedule.<\/p>\n

The site is deployed as a Docker<\/a> container on a Dokku<\/a> instance. Dokku replicates the Heroku<\/a> style of deployments by accepting Git pushes to trigger deploys. Dokku also has a great Let’s Encrypt<\/a> plugin for setting up and renewing HTTPS certificates for your apps.<\/p>\n

groovecoder: Scary\/Tracky JS<\/h2>\n

Next was groovecoder<\/a>, who previewed a lightning talk he’s been working on called “Scary JavaScript (and other Tech) that Tracks You Online”. The talk gives an overview of various methods that sites can use to track what sites you’ve visited without your consent. Some examples given include:<\/p>\n