90 lines
3.1 KiB
Nix
90 lines
3.1 KiB
Nix
{
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description = "haskell-template's description";
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inputs = {
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nixpkgs.url = "github:nixos/nixpkgs/nixpkgs-unstable";
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flake-utils.url = "github:numtide/flake-utils";
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flake-utils.inputs.nixpkgs.follows = "nixpkgs";
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flake-compat.url = "github:edolstra/flake-compat";
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flake-compat.flake = false;
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flake-compat.inputs.nixpkgs.follows = "nixpkgs";
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};
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outputs = inputs:
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let
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# Function that produces Flake outputs for the given system.
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outputsFor = system:
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let
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# Because: https://zimbatm.com/notes/1000-instances-of-nixpkgs
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pkgs = inputs.nixpkgs.legacyPackages.${system};
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inherit (pkgs.lib.trivial) pipe flip;
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inherit (pkgs.lib.lists) optionals;
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# Specify GHC version here. To get the appropriate value, run:
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# nix-env -f "<nixpkgs>" -qaP -A haskell.compiler
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hp = pkgs.haskellPackages; # Eg: pkgs.haskell.packages.ghc921;
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# Specify your build/dev dependencies here.
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shellDeps = with hp; [
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cabal-fmt
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cabal-install
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ghcid
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haskell-language-server
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fourmolu
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hlint
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pkgs.nixpkgs-fmt
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pkgs.treefmt
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];
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project = returnShellEnv:
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hp.developPackage {
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inherit returnShellEnv;
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name = "haskell-template";
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root = ./.;
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withHoogle = false;
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overrides = self: super: with pkgs.haskell.lib; {
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# Use callCabal2nix to override Haskell dependencies here
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# cf. https://tek.brick.do/K3VXJd8mEKO7
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# Example:
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# > NanoID = self.callCabal2nix "NanoID" inputs.NanoID { };
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# Assumes that you have the 'NanoID' flake input defined.
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};
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modifier = drv:
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let inherit (pkgs.haskell.lib) addBuildTools;
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in
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pipe drv
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[
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# Transform the Haskell derivation (`drv`) here.
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(flip addBuildTools
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(optionals returnShellEnv shellDeps))
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];
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};
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in
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{
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# Used by `nix build ...`
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packages = {
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default = project false;
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};
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# Used by `nix run ...`
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apps = {
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default = {
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type = "app";
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program = "${inputs.self.packages.${system}.default}/bin/haskell-template";
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};
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};
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# Used by `nix develop ...`
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devShells = {
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default = project true;
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};
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# For compatability with older Nix (eg in CI)
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devShell = inputs.self.devShells.${system}.default;
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defaultPackage = inputs.self.packages.${system}.default;
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defaultApp = inputs.self.apps.${system}.default;
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};
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in
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inputs.flake-utils.lib.eachDefaultSystem outputsFor
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// {
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# For hercules-CI support,
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# https://docs.hercules-ci.com/hercules-ci/guides/upgrade-to-agent-0.9/#_upgrade_your_repositories
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herculesCI.ciSystems = [ "x86_64-linux" ];
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};
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}
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