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Refactor flake.nix

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This commit is contained in:
Sridhar Ratnakumar 2022-04-27 18:55:51 -04:00
parent 916b9023d8
commit 5dad24283f
1 changed files with 42 additions and 24 deletions
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66
flake.nix
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@ -15,16 +15,31 @@
inputs.nixpkgs.follows = "nixpkgs"; inputs.nixpkgs.follows = "nixpkgs";
}; };
}; };
outputs = inputs@{ self, nixpkgs, flake-utils, ... }:
flake-utils.lib.eachDefaultSystem outputs = inputs:
(system: let
# Function that produces Flake outputs for the given system.
outputsFor = system:
let let
# Because: https://zimbatm.com/notes/1000-instances-of-nixpkgs # Because: https://zimbatm.com/notes/1000-instances-of-nixpkgs
pkgs = nixpkgs.legacyPackages.${system}; pkgs = inputs.nixpkgs.legacyPackages.${system};
inherit (pkgs.lib.trivial) pipe flip;
inherit (pkgs.lib.lists) optionals;
# Change GHC version here. To get the appropriate value, run: # Specify GHC version here. To get the appropriate value, run:
# nix-env -f "<nixpkgs>" -qaP -A haskell.compiler # nix-env -f "<nixpkgs>" -qaP -A haskell.compiler
hp = pkgs.haskellPackages; # pkgs.haskell.packages.ghc921; hp = pkgs.haskellPackages; # Eg: pkgs.haskell.packages.ghc921;
# Specify your build/dev dependencies here.
shellDeps = with hp; [
cabal-fmt
cabal-install
ghcid
haskell-language-server
fourmolu
hlint
pkgs.nixpkgs-fmt
];
project = returnShellEnv: project = returnShellEnv:
hp.developPackage { hp.developPackage {
@ -40,16 +55,14 @@
# Assumes that you have the 'NanoID' flake input defined. # Assumes that you have the 'NanoID' flake input defined.
}; };
modifier = drv: modifier = drv:
pkgs.haskell.lib.addBuildTools drv (with hp; pkgs.lib.lists.optionals returnShellEnv [ let inherit (pkgs.haskell.lib) addBuildTools;
# Specify your build/dev dependencies here. in
cabal-fmt pipe drv
cabal-install [
ghcid # Transform the Haskell derivation (`drv`) here.
haskell-language-server (flip addBuildTools
fourmolu (optionals returnShellEnv shellDeps))
hlint ];
pkgs.nixpkgs-fmt
]);
}; };
lintSpec = { lintSpec = {
@ -60,24 +73,29 @@
ghcOpts = "-o-XTypeApplications -o-XImportQualifiedPost"; ghcOpts = "-o-XTypeApplications -o-XImportQualifiedPost";
}; };
}; };
in in
{ {
# Used by `nix build` & `nix run` (prod exe) # Used by `nix build ...`
defaultPackage = project false; packages = {
# Used by `nix develop` (dev shell) default = project false;
devShell = project true; };
# Used by `nix run ...` # Used by `nix run ...`
apps = { apps = {
default = { default = {
type = "app"; type = "app";
program = "${self.defaultPackage.${system}}/bin/haskell-template"; program = "${inputs.self.packages.${system}.default}/bin/haskell-template";
}; };
format = inputs.lint-utils.mkApp.${system} lintSpec; format = inputs.lint-utils.mkApp.${system} lintSpec;
}; };
# Used by `nix develop ...`
devShells = {
default = project false;
};
}) // { };
in
inputs.flake-utils.lib.eachDefaultSystem outputsFor
// {
# For hercules-CI support, # For hercules-CI support,
# https://docs.hercules-ci.com/hercules-ci/guides/upgrade-to-agent-0.9/#_upgrade_your_repositories # https://docs.hercules-ci.com/hercules-ci/guides/upgrade-to-agent-0.9/#_upgrade_your_repositories
herculesCI.ciSystems = [ "x86_64-linux" ]; herculesCI.ciSystems = [ "x86_64-linux" ];