20/05/2010
I’ve fixed a bug related to upgrading GHC to version 6.12 (thanks to Cale and the folks on haskell-cafe who helped me with the issue) and got my Befunge-93 interpreter up on hackage. The program is written in haskell (as usual). You should be able to get it soon with a:
$> cabal install Befunge93
If you want to read about how I designed it you can check out the source above, or take a look at my previous blog post.
Please report any bugs to me, and I’m also very interested in patches or suggestions for performance improvements if anyone ends up being interested in this program.
EDIT: Here is the package page: http://hackage.haskell.org/package/Befunge93
24/03/2010
We don’t usually give much thought to Numeric data types beyond whether we want to work with integers or decimal numbers. And that is a shame! In this post I’ll look at how we can actually do arithmetic operations lazily, and in the process hopefully reveal a bit about haskell’s numeric classes.
module LazyArithmetic
where
We will be using Lennart Augustsson’s numbers library which can be installed from hackage with cabal-install:
$> cabal install numbers
import Data.Number.Natural
import Data.List(genericLength)
Consider two functions: the Prelude function sum and genericLength from the List library:
genericLength :: (Num i) => [b] -> i
sum :: (Num a) => [a] -> a
…two simple functions that have the potential to be very expensive, depending on the length of the list and the values of the elements.
Read the rest of this article »
9/05/2009
I’ve released my first package, up now on hackage (haddock docs should be generated soon). The module provides a simple data structure that mirrors a directory tree, and some useful functions for doing IO on directories of files. You can read more about it here.
It’s very likely there are some bugs, especially related to cross platform issues with file names and paths. The module is also fairly bare, so please send me any requests for functionality that I haven’t thought of, as well as any bugs you might find.
You can install it with:
$ cabal install directory-tree
And get the source with:
$ darcs get http://coder.bsimmons.name/code/DirectoryTree/
I hope this is useful to someone!
