Haskell: Difference between revisions

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When using <code>cabal2nix</code>, Nix does not pull a cabal package by respecting the constraint specified in the cabal file (see [https://github.com/chrissound/Cabal2NixLimitationExample example]). Issue is discussed [https://stackoverflow.com/questions/57441156/pulling-in-specific-haskell-packages-cabal-dependencies-with-nix here]. You should be using `callCabal2nix` anyway.
When using <code>cabal2nix</code>, Nix does not pull a cabal package by respecting the constraint specified in the cabal file (see [https://github.com/chrissound/Cabal2NixLimitationExample example]). Issue is discussed [https://stackoverflow.com/questions/57441156/pulling-in-specific-haskell-packages-cabal-dependencies-with-nix here]. You should be using `callCabal2nix` anyway.
[[Category:Languages]]
[[Category:Applications]]

Revision as of 05:52, 20 September 2021

Introduction

Nix recipes for Haskellers aims to get a beginner comfortable managing simple Haskell programs and projects using Nix.

Scripting

Here's an example using nix-shell to get a redistributable Haskell script that you can run on any Nix system with `./my-script.hs`:

#!/usr/bin/env nix-shell
#!nix-shell --pure -i runghc -p "haskellPackages.ghcWithPackages (pkgs: [ pkgs.turtle ])"

main = do
  # do stuff
  putStrLn "Hello world from a distributable Haskell script!"

FAQ

Limitations

When using cabal2nix, Nix does not pull a cabal package by respecting the constraint specified in the cabal file (see example). Issue is discussed here. You should be using `callCabal2nix` anyway.