Haskell: Difference between revisions

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== Introduction ==

[https://www.srid.ca/haskell-nix '''Nix recipes for Haskellers'''] aims to get a beginner comfortable managing simple Haskell programs and projects using Nix.

== FAQ and resources ==

* [https://haskell4nix.readthedocs.io/ The official documentation] (the [https://nixos.org/manual/nixpkgs/stable/#haskell manual] directly points to this ressource)

* [https://discourse.nixos.org/t/haskellpackages-stm-containers-fails-to-build/5416/4?u=srid '''How are Haskell packages managed in nixpkgs?''']

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There are multiples ways to develop in Haskell on Nix depending on the simplicity of the project and on whether one want to benefit from the reproducibility offered by nix or not.

Note that in the following, <code>haskellPackages</code> is a synonym of <code>haskell.packages.ghcXYZ</code> where <code>XYZ</code> is the current default version of GHC in nixpkgs. However you can use a different version by replacing <code>haskellPackages</code> with the wanted package, for instance use <code>haskell.packages.ghc884</code> to use GHC 8.8.4. You can get the full list of available GHC versions using:

$ nix-env -f "<nixpkgs>" -qaP -A haskell.compiler

haskell.compiler.ghc8107 ghc-8.10.7

haskell.compiler.ghc884 ghc-8.8.4

haskell.compiler.ghc902 ghc-9.0.2

haskell.compiler.ghc924 ghc-9.2.4

haskell.compiler.ghcHEAD ghc-9.3.20220406

haskell.compiler.ghc942 ghc-9.4.2

…

</syntaxhighlight>

=== Scripting ===