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Bryan O'Sullivan's blog
Monthly Archives: January 2007
Parsing a simple config file in Haskell
Even though I wrote my Haskell blog helper tool purely for my own use, I don’t want to store hard-coded strings in it, lest my username and password escape into the wild. This suggests that I need a small config…
Blogging with Emacs and Haskell, part Zero
Since I started using WordPress to host my blog, I’ve generally been fairly pleased with it. Its killer feature has to be Akismet, the built-in spam filter. Akismet has so far killed over 18,000 spam comments for me, or roughly…
Beautiful graphics manipulation (in Haskell, artistic flair required)
During my evening’s Haskell-related Googling, I came across a piece of software called Pancito, written by Andrew Cooke. Pancito is a Haskell package for manipulating images, and Andrew has a beautiful gallery of some of the work he’s done with…
Posted in haskell, open source
Playing fast and loose with Parsec for parsing in Haskell
For the past number of years, whenever I’ve needed to write a parser for a language, I’ve turned to Terence Parr’s ANTLR. It’s a wonderful piece of software, far more capable than the old standbys lex and yacc. Just as…
Posted in haskell
New Haskell packages for Fedora Extras
Rather than bemoan the state of prepackaged Haskell goodness for Fedora, I’ve started down the path of doing something about it. This morning, I put together new packages for Alex, a Haskell lexer, and Happy, a parser generator, and submitted…
Posted in haskell
Attention, the Soviet herring fleet!
From the department of microscopic obsessions of the bourgeoisie: I’ve subscribed to The New Yorker since I first came to the US, over a decade ago. On a mailing list, a correspondent alerts readers to this blog entry, which tickled…
Posted in reading
First impressions of darcs: not so hot
I’ve been using darcs recently for some Haskell-related revision control tasks, as it’s the revision control tool of choice for the Haskell community (no surprise; it’s the most widely used Haskell program in existence). However, I can’t say I’ve been…
Posted in scm
Two-dimensional spatial hashing with space-filling curves
The Hilbert curve is a fractal space-filling curve that is rather pretty to look at. A Hilbert curve of order n traces a single path over a square of side 2^n units, as you can see in the images from…
Haskell: bootstrapping into a clue about monads
As part of my remedial Haskell learning process, I’ve been getting my feet wet once more with monads. Here are a few notes on the techniques that I’ve tried, and how I’ve fared with them. Not surprisingly, my first step…
Posted in haskell
Getting started with installing third-party Haskell packages
Since I’ve been away from the Haskell world for a long time, it’s been interesting to return and observe some surprises about the practical side of working with the language. For me, an early gotcha has been the relative paucity…
