Better IO testing through Monads

:: haskell, monads, type classes, testing

Unit Testing is a great way to try to verify consistent functionality over the life of our code. Typically we design our tests to cover ranges and edge cases of our code making sure that we can handle all inputs. This is made easy when we write in Functional Languages as there (should be) no side effects. But when you want to deal with IO and side affect code in Haskell, this becomes much more difficult.

This problem has been fixed many times, but often with very complex solutions. Let’s see if we can make it really simple (even if the post is long).

Gitolite Public HTTP Access

:: tutorial, git

I’ve always liked self hosting as it gives you the most flexability. With projects like gitolite you can ditch the heavy database, the server side scripting languages and run a nicely configured and feature rich server on something as small as a Raspberry Pi.

Gitolite supports gitweb, but when running on Debian it required me to install apache2, and configure CGI. Other distros I’ve tried were even worse with dependencies. All I want to is give public, read-only access via http. Can’t be too difficult, right?

Haskell Project: Unit Testing with Hspec

:: haskell, tutorial, hspec, testing

Up to this point we have written some code, explained type classes, and done a little pattern matching. But we haven’t written anything that really does anything. Until we have some IO to perform, we will have to find another way to interact with our code. This is a perfect chance to introduce Unit Testing.

Haskell Project: Show, Compare, and Filter

:: haskell, tutorial

Now that we have a few basic types we should start working on making their interaction nicer. It is pretty important to be able to print and compare data types so we will start there. Once we are able to compare, we should be able to filter lists of data types.

Moving to Amazon Lightsail

:: Meta

For the past few years I’ve been running my websites, email, XMPP instance and other random services off of a few Raspberry Pi 2 sitting in my house. But after a long battle with our ISP and their inability to keep our service up I finally decided to move to a paid VPS. After searching around I decided to try Amazon Lightsail. So far its working nicely…unless you can’t see this post.

Haskell Project: Stack and Data Types

:: haskell, tutorial, stack

To work on my Haskell skills I decided to work on a little side project. I didn’t want something too complicated but I did want to try out some of the more fun and interesting tasks that Haskell does well.

As I work on the project I’ll go through the code, as a sort of tutorial on creating an actual application.

Blogging with a frog: I’m bad a themes

:: Meta

I’ve been busy with a ton of projects and a slump at work so I’ve been all over spectrum on wanting to do anything related to computers. I’ve moved my blog to a Raspberry Pi 2 and felt that I needed something that was static but yet functional. So I’m trying out Frog.