Author Archives: Felipe Lessa

Announcing serversession

I’m pleased to announce the serversession family of packages. Background HTTP is a stateless protocol. Cookies are used to create sessions out of otherwise independent requests made by the browser to the server. There are many ways of managing sessions … Continue reading

Posted in Haskell | Leave a comment

Using stack on NixOS

I’ve got myself a new laptop recently and decided to try NixOS. It’s been a great experience so far, but there are some rough edges. One of them is stack not completely working out of the box for my projects.

Posted in Uncategorized | 4 Comments

Using Caps Lock as Menu/Apps keys on Emacs

I’m an ergoemacs-mode user, a mode that changes most key bindings so that they put less strain on your hands.  For example, it uses Alt instead of Ctrl most of the time, which is easier to press: use your curled … Continue reading

Posted in Uncategorized | 2 Comments

Changing NetworkManager route metrics

If you use NetworkManager with more than one interface, you probably want to control the metric of their routes. Here’s one way you can do it.

Posted in Uncategorized | 4 Comments

Sensors detective

I have an Asus M5A97 PRO motherboard, which includes the common set of sensors. The lm-sensors free software correctly detects two chips, k10temp-pci-00c3 and it8721-isa-0290, corresponding to my Phenom II and my motherboard, respectively. However, by default the output of … Continue reading

Posted in Hacking | Tagged , , , , | 7 Comments

Esqueleto now supports IN and EXISTS

Since version 0.2.9 that I’ve just released, esqueleto supports IN and EXISTS operators (and their negated counterparts). For example: select $ from $ \person -> do where_ $ exists $          from $ \post -> do   … Continue reading

Posted in Haskell | 3 Comments

Announcing esqueleto, a type-safe EDSL for SQL queries

I’m very pleased to announce a preview release of esqueleto, a bare bones, type-safe EDSL for SQL queries.

Posted in Haskell | Tagged , , , , , , | 7 Comments

Abstracting permissions with Yesod

Yesod is a terrific framework for web applications in Haskell.  It has many, many built-in features.  One of them is that there’s nice support for authentication and authorization.  In this post I’m interested in talking about how you could write … Continue reading

Posted in Uncategorized | Tagged , | 2 Comments