🎬 The source for Point-Free, a video series on functional programming and the Swift programming language.
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🎬 www.pointfree.co

Swift 4.1 iOS/macOS CI Linux CI @pointfreeco

This repo contains the full source code for the Point-Free website, a video series exploring Swift and functional programming. The codebase is split into 3 pieces:

  • PointFree: This is the core application, and is responsible for routing requests, loading data and rendering HTML and CSS.
  • Styleguide: This library contains functions and data types for creating a consistent style across the entire website.
  • Server: This is the actual executable server. It uses NIO to handle the low-level server responsibilities, and hands everything else over to the PointFree package.

Point-Free Homepage

Getting Started

Interested in a video tour of the code base?

video poster image

The repo contains an extensive test suite and some playgrounds to explore. To get things running:

  • Make sure Xcode is installed!

  • Make sure cmark is installed. You can install it with Homebrew:

    brew install cmark # or your preferred installation method
  • Make sure Postgres is installed and running. It's our database of choice. You can install it with Homebrew:

    brew install postgres # or your preferred installation method
    brew services start postgresql # or your preferred launch method

    (If you use Postgres.app, EnterpriseDB, or another installation method, please follow some additional instructions in the CPostgreSQL README.)

  • Open up a terminal window and grab the code:

    git clone https://github.com/pointfreeco/pointfreeco.git
    cd pointfreeco
  • Bootstrap! If you want us to take care of the details for you, we need to install a few module maps in your SDK path to make sure CommonCrypto, Postgres, cmark, and other modules are available to our libraries, playgrounds, and tests. We also need to set up a pointfreeco user and database in Postgres. You can read our Makefile for more info, and run:

    make bootstrap-oss

With everything bootstrapped and the project open in Xcode, you can:

  • Run the server locally
    • Select the Server target
    • Run: Command+R
    • Visit http://localhost:8080
  • Explore our playgrounds
    • Select the PointFree-Package target
    • Build: Command+B
    • Open a playground!

Some fun things to explore

There're a lot of fun things to explore in this repo. For example:

  • We develop web pages in playgrounds for a continuous feedback loop. This is made possible by the fact that the entire server stack is composed of pure functions with side-effects pushed to the boundaries of the application. It allows us to load up any request in isolation, including POST requests, all without ever worrying about doing a side-effect. Server side Swift in a playground

  • We use snapshot testing to capture full data structures in order to verify their correctness. Not only do we do this in the traditional way of taking screenshots of web pages at various break points (e.g. on iPhone and desktop), but we can also snapshot any entire request-to-response lifecycle (e.g. the POST to a signup page does the correct redirect).

▿ Step

▿ Request
  POST http://localhost:8080/launch-signup


▿ Response
  Status 302 FOUND
  Location: /?success=true

Xcode Color Theme

Like the color theme we use in our episodes? Run make colortheme to install locally!

Related projects

Point-Free uses a bunch of interesting open-source software:

  • 🗺 swift-html: A Swift DSL for type-safe, extensible, and transformable HTML documents.
  • 🕸 swift-web: A collection of types and functions for dealing with common web server concerns, such as HTML render, CSS preprocessing, middleware and more.
  • 🎶 swift-prelude: Offers a standard library for experimental functional programming in Swift.
  • 🏷 swift-tagged: Helps us create strong contracts with our data boundaries, like JSON from GitHub and Stripe, and our PostgreSQL data.
  • 📸 swift-snapshot-testing: Powers our testing infrastructure by taking snapshots of various data structures to guarantee the correctness of their output. We use this on everything from middleware to ensure requests are correctly transformed into responses, and even entire web pages to make sure the site looks correct at a variety of sizes (e.g. on iPhone and desktop).

Explore more of our open-source on the Point-Free organization.

Learn More

Brandon gave a talk about most of the core ideas that went into this project at Swift Summit 2017.

The two sides of writing testable code

Find this interesting?

Then check out Point-Free!


The content of this project itself is licensed under the CC BY-NC-SA 4.0 license, and the underlying source code used to format and display that content is licensed under the MIT license.