haskell-flake

A flake-parts Nix module for Haskell development.

Why?

To keep flake.nix smaller (see examples below) and declarative (what vs how) by bringing a NixOS-like module system to flakes (through flake-parts).

Usage

To use haskell-flake in your existing Haskell projects, run:

nix flake init -t github:srid/haskell-flake

To create a new Haskell project, run:

nix flake init -t github:srid/haskell-flake#example

Template

You may also use https://github.com/srid/haskell-template which already uses haskell-flake along with other opinionated defaults.

Documentation

Check out the list of options. haskell-flake uses callCabal2nix and shellFor under the hood.

Examples

• Simple
  • https://github.com/srid/haskell-template/blob/master/flake.nix
  • https://github.com/fpindia/fpindia-site/blob/master/flake.nix
  • https://github.com/srid/haskell-multi-nix/blob/master/flake.nix (Demonstrates multiple local packages)
• Complex:
  • https://github.com/srid/emanote/blob/master/flake.nix
  • https://github.com/srid/ema/blob/master/flake.nix

Recommendations

• Use treefmt-nix for providing linting features like auto-formatting and hlint checks. See haskell-template for example.