Inside 736-131

Existential Pontification and Generalized Abstract Digressions

Haskell

What Template Haskell gets wrong and Racket gets right

Why are macros in Haskell terrible, but macros in Racket great? There are certainly many small problems with GHC's Template Haskell support, but I would say that there is one fundamental design point which Racket got right and Haskell got wrong: Template Haskell does not sufficiently distinguish between compile-time and run-time phases. Confusion between these […]

  • July 18, 2016

Announcing cabal new-build: Nix-style local builds

cabal new-build, also known as “Nix-style local builds”, is a new command inspired by Nix that comes with cabal-install 1.24. Nix-style local builds combine the best of non-sandboxed and sandboxed Cabal: Like sandboxed Cabal today, we build sets of independent local packages deterministically and independent of any global state. new-build will never tell you that […]

  • May 2, 2016

ghc-shake: Reimplementing ghc -​-make

ghc --make is a useful mode in GHC which automatically determines what modules need to be compiled and compiles them for you. Not only is it a convenient way of building Haskell projects, its single-threaded performance is good too, by reusing the work of reading and deserializing external interface files. However, the are a number […]

  • January 7, 2016

What is Stateless User Interface?

The essence of stateless user interface is that actions you take with a program should not depend on implicit state. Stateless interfaces are easier to understand, because an invocation of a command with some arguments will always do the same thing, whereas in a stateful interface, the command may do some different than it did […]

  • November 27, 2015

Is no-reinstall Cabal coming to GHC 8.0?

You might be wondering: with the beta release of no-reinstall Cabal, is this functionality be coming to GHC 8.0? (Or even a new release of Cabal, since the no-reinstall feature works with GHC 7.10). Unfortunately, there is a split among the Cabal developers over whether or not the actual no-reinstall behavior should go into Cabal […]

  • September 18, 2015

Help us beta test “no-reinstall Cabal”

Over this summer, Vishal Agrawal has been working on a GSoC project to move Cabal to more Nix-like package management system. More simply, he is working to make it so that you'll never get one of these errors from cabal-install again: Resolving dependencies... In order, the following would be installed: directory-1.2.1.0 (reinstall) changes: time-1.4.2 -> […]

  • August 29, 2015

Width-adaptive XMonad layout

My usual laptop setup is I have a wide monitor, and then I use my laptop screen as a secondary monitor. For a long time, I had two XMonad layouts: one full screen layout for my laptop monitor (I use big fonts to go easy on the eyes) and a two-column layout when I'm on […]

  • May 2, 2015

Haskell Implementor’s Workshop ’14

This year at ICFP, we had some blockbuster attendance to the Haskell Implementor's Workshop (at times, it was standing room only). I had the pleasure of presenting the work I had done over the summer on Backpack. You can grab the slides or view the presentation itself (thank you ICFP organizers for being incredibly on-the-ball […]

  • September 7, 2014

Open type families are not modular

One of the major open problems for building a module system in Haskell is the treatment of type classes, which I have discussed previously on this blog. I've noted how the current mode of use in type classes in Haskell assume “global uniqueness”, which is inherently anti-modular; breaking this assumption risks violating the encapsulation of […]

  • September 4, 2014

A taste of Cabalized Backpack

So perhaps you've bought into modules and modularity and want to get to using Backpack straightaway. How can you do it? In this blog post, I want to give a tutorial-style taste of how to program Cabal in the Backpack style. None of these examples are executable, because only some of this system is in […]

  • August 26, 2014