srid/haskell-flake

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# haskell-flake - Ergonomic Nix module for Haskell development <img src="./doc/haskell-flake.webp" width=100 /> There are [several ways](https://nixos.asia/en/haskell) to manage Haskell packages using [Nix](https://nixos.asia/en/nix) with varying degrees of integration. `haskell-flake` makes Haskell development, packaging and deployment with Nix a lot [simpler](https://haskell.nixos.asia/start#under-the-hood) than other existing approaches. It works with plain Nix (no flakes), Nix flakes, or as a [`flake-parts`](https://flake.parts/) module—choose whichever fits your project. To see more background information, guides and best practices, visit https://haskell.nixos.asia Caveat: `haskell-flake` only supports the Haskell package manager [Cabal](https://www.haskell.org/cabal/), so your project must have a top-level `.cabal` file (single package project) or a `cabal.project` file (multi-package project). ## Getting started The guide below uses [flake-parts](https://flake.parts/); for other approaches see [standalone usage](https://haskell.nixos.asia/standalone). The minimal changes to your `flake.nix` to introduce `haskell-flake` with flake-parts will look similar to: ```nix # file: flake.nix { inputs = { ... flake-parts.url = "github:hercules-ci/flake-parts"; haskell-flake.url = "github:srid/haskell-flake"; }; outputs = inputs: inputs.flake-parts.lib.mkFlake { inherit inputs; } { systems = [ "x86_64-linux", ... ]; imports = [ ... inputs.haskell-flake.flakeModule ]; perSystem = { self', system, lib, config, pkgs, ... }: { haskellProjects.default = { # basePackages = pkgs.haskellPackages; # Packages to add on top of `basePackages`, e.g. from Hackage packages = { aeson.source = "1.5.0.0"; # Hackage version }; # my-haskell-package development shell configuration devShell = { hlsCheck.enable = false; }; # What should haskell-flake add to flake outputs? autoWire = [ "packages" "apps" "checks" ]; # Wire all but the devShell }; devShells.default = pkgs.mkShell { name = "my-haskell-package custom development shell"; inputsFrom = [ ... config.haskellProjects.default.outputs.devShell ]; nativeBuildInputs = with pkgs; [ # other development tools. ]; }; }; }; } ``` `haskell-flake` scans your folder automatically for a `.cabal` or `cabal.project` file. In this example an imaginary `my-haskell-package.cabal` project is used. To see in more detail how to use `haskell-flake` in a realistic Haskell project with several other development tools, take a look at the corresponding [Haskell single-package project Nix template](https://github.com/srid/haskell-template) and this [Haskell multi-package project Nix example](https://github.com/srid/haskell-multi-nix). ## Documentation https://haskell.nixos.asia ## Discussion Please post questions & ideas in [Github Discussions](https://github.com/srid/haskell-flake/discussions).

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