[tools] tools

Ghcid for multi package projects []

GHCID magic

When I tried Ghcidfor a reflex, it wouldn’t rebuild on file change. This is because reflex has a multi package project setup by default. Recently I found that it is possible to use Ghcid for multi package project builds. The trick is to create an executable that includes …

Pinning nixops builds []

Pinned nixops

On one machine my Nixops builds and deploys, but on the other one it fails. Why? Isn’t nix supposed to deliver reproducible builds? Turns out nixops uses by default your system configurations’ channels rather then a pinned nix packages. Which is not why you’re using nix. You want …

Reflex server side html rendering []

Reflex is a single page app framework written in Haskell compiled to JavaScript. A major concern with reflex is the slow loading times, this can be mediated however by doing server side rendering1. This blog post will discuss how to do that2.

Bob doing SSR

The main idea is that we …

Nixos notes []

This is a post of things I wanted to do in nixos but isn’t described anywhere. I had to read source code to figure these things out. By explaining here what is going on I make things easier for other people.

Nixos notes

Nix custom image

It’s possible to bypass …

Authentication in Reflex & Servant []

In the previous blog post we saw interaction with servant in reflex. Although that covers the basics, there are several more hurdles to overcome to get comfortable with Reflex. I think most of these are encountered by building a simple login system. So let’s build something like:

                       +------------------+
   +-----------+       |    .      -      |
   | +--------+|       | .    -  .. .     |
   | +--------+|       | . .-- - + m..-.  |
   | +--------+|    \  |   m …

Fullstack Haskell: Reflex and Servant []

In the pragmatic haskell series, we saw how to setup a simple webserver with database. But at some point you still need a frontend. If it were 2005 you may have been able to get away with just blaze. But we are in 2018+, and JavaScript is a problem. In …

Nixos on encrypted btrfs []

Nixos is heroin for tinkerers. Paradise can be tinkered together and be freely shared among peers because it’s fully reproducible! Jappie wanted more, he wanted a secure disk and a BTRFS. There used to be no guides for this, now there is.

Locked btrfs on nixos

The bullet was bitten, BTRFS was made …

Pragmatic Haskell III: Beam Postgres DB []

No need to read a book to use Haskell! This post will get you going with a serious web application while only sticking to the concepts that are encountered. This is a Haskell safari with as end goal a working webapp with database.

  1. Pragmatic Haskell: Simple servant web server
  2. Pragmatic …

Pragmatic Haskell II: IO Webservant []

  1. Pragmatic Haskell: Simple servant web server
  2. Pragmatic Haskell II: IO Webservant
  3. Pragmatic Haskell III: Beam Postgres DB

Most Haskell language guides will leave IOuntillater. This guide is different, this guide is about using Haskell. Our focus is different: We build first, then learn trough delight.

Fancy intro image

The previous blog …

Pragmatic Haskell: Simple servant web server []

  1. Pragmatic Haskell: Simple servant web server
  2. Pragmatic Haskell II: IO Webservant
  3. Pragmatic Haskell III: Beam Postgres DB

There are many guides available for learning Haskell. Setting up a something simple like a web server isn’t so straight forward. Perhaps choosing one of the 14 libraries is a bit much …

Fun with stack: Haskell dependency management []

Haskel stack logo

Working at Daisee, Jappie uses a lot of Haskell programming. Although Haskell is obviously as amazing as the stereotype asserts, the tooling can be a bit challenging. In this blogpost we explore these challenges.

One’s understanding start with the fact that there is not one unified Haskell package manager …

Reddit poster plugin for pelican []

Yesterday the Reddit Poster plugin for pelican was finished. This is an initial step towards providing Reddit integration with pelican.

What this plugin does is look a predefined list of subreddits names in an article, then it posts the article to all those subreddits. Aside from the subreddits in the …

Flask, docker and the backend []

Jappie Klooster is working with friends on a react native app. It was attempted to do this completely without server-side with help of Firebase. This post describes the thought process behind not using Firebase for everything, and setting up a custom backend instead.

The first major issue, for this use …

Plan prediction []

For the raster project a main selling point will be the automatic prediction of future scheduling. There are two major schools of thoughts to go with that I know of. Constraint satisfaction solving and data driven approaches (use statistics).

First of all the most straight forward approach is to use …

Tool survey []

Some time ago I made a blog post about thesis writing tips. However while writing that a large part started to be about text editing tools and version control. To keep the thesis writing tips post more focused I postponed writing about that. This post treats my tools of choice …

Optimus time! []

Using gentoo is a bliss most of the time. The package manager portage is one of the most advanced managers that I’ve ever used. Last week I encountered how much better it is than for example apt, when my old laptops power supply burned out and I had to …