111 lines
4.3 KiB
Nix
111 lines
4.3 KiB
Nix
{
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description = "haskell-template's description";
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inputs = {
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# To find a suitable nixpkgs hash, pick one from https://status.nixos.org/ (these are cached)
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nixpkgs.url = "github:nixos/nixpkgs/d9e593ed5889f3906dc72811c45bf684be8865cf";
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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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lint-utils = {
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type = "git";
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url = "https://gitlab.homotopic.tech/nix/lint-utils.git";
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ref = "overengineered"; # https://gitlab.homotopic.tech/nix/lint-utils/-/merge_requests/4
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inputs.nixpkgs.follows = "nixpkgs";
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};
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};
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outputs = inputs@{ self, nixpkgs, flake-utils, ... }:
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flake-utils.lib.eachDefaultSystem
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(system:
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let
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# Because: https://zimbatm.com/notes/1000-instances-of-nixpkgs
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pkgs = nixpkgs.legacyPackages.${system};
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# Change 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; # pkgs.haskell.packages.ghc921;
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# Paths to ignore when building the cabal package.
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# FIXME: Why does changing any of this this retrigger Nix builds anyway?
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ignorePatterns = [ "*.nix" "flake.lock" "*.md" "fourmolu.yaml" "hie.yaml" "bin" ".envrc" ".ghcid" ".gitattributes" ".github" ".gitignore" ".vscode" ];
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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 = pkgs.nix-gitignore.gitignoreSource ignorePatterns ./.;
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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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pkgs.haskell.lib.addBuildTools drv (with hp; pkgs.lib.lists.optionals returnShellEnv [
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# Specify your build/dev dependencies here.
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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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]);
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};
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lintSpec = {
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nixpkgs-fmt = { };
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cabal-fmt = { };
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# hlint = { };
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fourmolu = {
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ghcOpts = "-o-XTypeApplications -o-XImportQualifiedPost";
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};
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};
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# Checks the shell script using ShellCheck
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checkedShellScript = name: text:
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(pkgs.writeShellApplication {
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inherit name text;
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}) + "/bin/${name}";
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in
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{
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# Used by `nix build` & `nix run` (prod exe)
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defaultPackage = project false;
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# Used by `nix develop` (dev shell)
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devShell = project true;
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# Used by `nix run ...`
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apps = {
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format = inputs.lint-utils.mkApp.${system} lintSpec;
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};
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# Used by `nix flake check` (but see next attribute)
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checks =
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inputs.lint-utils.mkChecks.${system} lintSpec ./.
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// {
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hls = checkedShellScript "hls" "${hp.haskell-language-server}/bin/haskell-language-server";
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};
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# We need this hack because `nix flake check` won't work for Haskell
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# projects: https://nixos.wiki/wiki/Import_From_Derivation#IFD_and_Haskell
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#
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# Instead, run: `nix build .#check.x86_64-linux` (replace with your system)
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check =
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pkgs.runCommand "combined-checks"
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{
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checksss = builtins.attrValues self.checks.${system};
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} ''
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echo $checksss
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touch $out
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'';
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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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