Lost in Technopolis

by John Wiegley

Emacs: Pattern Matching with pcase

This is a tutorial on how to use the pcase macro in modern flavors of GNU Emacs. Exact matches All data fits into some kind of pattern. The most explicit pattern is a description of the data itself. Let’s consider the following value as a running example: Explicitly stated, this is a list of four elements, where [...]

Posted on January 21, 2016 | read more

Simpler conduit library based on monadic folds

Recently I was playing around with the core types in the conduit library (attempting to change leftovers so you could only unget values you had read), when I stumbled across a formulation of those types that lead to some interesting simplifications. [...]

Posted on June 6, 2014 | read more

Using monad-control with monad transformers

This article assumes familiarity with monads and monad transformers. If you’ve never had an occasion to use lift yet, you may want to come back to it later. It is also available on the School of Haskell: https://www.fpcomplete.com/user/jwiegley/monad-control. The Problem What is the problem that monad-control aims to solve? To answer that, let’s back up a bit. We know that [...]

Posted on September 21, 2013 | read more

A whirlwind tour of conduits

Posted a very brief overview of the conduit library on the School of Haskell: https://www.fpcomplete.com/user/jwiegley/conduit-tour I hope it makes it clear just how easy and simple conduits are to use. If not, comments welcome! [...]

Posted on July 16, 2013 | read more

Update of gitlib libraries on Hackage, plus git-monitor

I’ve decided after many months of active development to release version 1.0.1 of gitlib and its related libraries to Hackage. There is still more code review to done, and much documentation to be written, but this gets the code out there, which has been working very nicely at FP Complete for about six months now. The more exciting tool for [...]

Posted on June 30, 2013 | read more

Nightly builds of GHC HEAD for Ubuntu 12.04.2 LTS

Chatting with merijn on #haskell, I realized I have a file server running Ubuntu in a VM that’s idle most of the time, so I decided to set up a jenkins user there and make use of it as a build slave in the evenings. This means that at http://ghc.newartisans.com, you’ll now find nightly builds of GHC HEAD for Ubuntu [...]

Posted on June 19, 2013 | read more

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