Neil Mitchell's Blog (Haskell etc)

Summary: Shake 0.14 is now out. The *> operator became %> . If you are on Windows the FilePath operations work differently. I'm ...

Summary: I wrote a script to list all operators on Hackage, and which packages they are used by. In GHC 7.10 the *> operator will be mov...

Summary: I thought through the issue of upper bounds on Haskell package dependencies, and it turns out I don't agree with anyone :-) The...

Summary: I'll be talking at CodeMesh 2014 on 5th November and FP Days on 20th November. I am giving two talks in London this month: Code...

Summary: I've just released a new version of HLint that can spot an unsafePerformIO which should have NOINLINE but doesn't. I've...

Summary: A few weeks ago Hackage stopped generating docs. I have a script that generates the docs, and also fixes some Haddock bugs. Update:...

Summary: Shake is not like Make, it has different internal state, which leads to different behaviour. I also store the state in an optimised...

Summary: I've written a continuous integration system, in Haskell, designed for large projects. It works, but probably won't scale y...

Summary: Rewriting the Prelude should be done in a separate package and take a few years to complete, hopefully building a consensus and imp...

Summary: For GHC 7.10, Traversable and Foldable are going to be in the Prelude. I missed the original discussion, but I suspect it's a b...

Summary: I've just released ghcid , which interactively shows the errors in your project on each save. I'm please to announce ghcid ...

Summary: It's not obvious how to generate suitable Open 3D Viewer models, but with the right tools it isn't hard. The Open 3D Viewer...

Summary: I've just released a new version of Shake, with a --demo feature and an underlying continuation monad. I want to release v1.0 i...

Summary: I spotted a few things using Shake, which I had nothing to do with. In the past few days I have come across several things using th...

Summary: In moving Shake to continuations, exceptions were the biggest headache. I figured out how to somewhat integrate continuations and e...

Summary: The Safe library now has exact versions of take / drop , with twelve functions implemented on top of a generalised splitAt . The S...

Summary: I have converted over 10,000 lines from Make to Shake. Here are some tips I learnt along the way. Make is the de facto build system...

Summary: Shake is a monadic build system, and monadic build systems are more powerful than applicative ones. Several people have wondered ...

Summary: Continuations are confusing. Here we solve a simple problem (that is at the heart of the Shake build system) using continuations. I...

Summary: I've released ghc-make , which is an alternative to ghc --make . I've just released v0.2 of ghc-make ( on Hackage , on Git...