Neil Mitchell's Blog (Haskell etc)

Summary: HLint --cross was accidentally quadratic in the number of files. One of my favourite blogs is Accidentally Quadratic , so when th...

Summary: A performance investigation uncovered a memory leak in unordered-containers and performance issues with Ghcide. Over the bank holid...

Summary: The new version of Shake has some tweaks to how stdin works with cmd . I've just released Shake 0.19 , see the full change log ...

Summary: Four improvements to Haskell I'm not going to raise as GHC proposals. Writing a GHC proposal is a lot of hard work. It require...

Summary: It is useful to trace files accessed by a command. Shake and FSATrace provide some tools to do that. When writing a build system, i...

Summary: HLint 3.0 uses the GHC parser. In June 2019 I posted about our intention to move HLint to the GHC parser. Since then a small group...

Summary: Interpretation by closure is a lot faster than I expected. Let's imagine we have an imperative language (expressions, assignmen...

Summary: Sometimes <- pure makes a lot of sense, avoiding some common bugs. In Haskell, in a monadic do block, you can use either <-...

Summary: There are four things I recommend to get a Haskell job. Applies to most technologies. I was recently emailed by someone who asked f...

Summary: The Haskell IDE Engine and Ghcide teams are joining forces on a single IDE. This weekend many of the Haskell IDE Engine (HIE) and ...

Summary: Rebindable syntax is powerful, but sometimes too flexible. I had some ideas on how to improve it. In Haskell, when you write 1 , GH...

Summary: You can describe type classes like monads by the graphs they allow. In the Build Systems a la Carte paper we described build syste...

Summary: We have been working on pieces for a Haskell IDE at Digital Asset. At Digital Asset , we wrote the DAML programming language . The ...

Summary: The rough rule I use for teams I'm on is make at least one PR per day. One of the principles I've used quite successfully i...

Summary: A very high-level view of the engineering aspects of Shake. The theory behind Shake is now well documented in the Build Systems a l...

Summary: HLint is going to switch to the GHC parser over the next few months. The plan is below. For some time, HLint has been accumulating ...