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|
{
inputs = {
nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
flake-utils = {
url = "github:numtide/flake-utils";
inputs.nixpkgs.follows = "nixpkgs";
};
};
outputs = { flake-utils, nixpkgs, self }:
flake-utils.lib.eachDefaultSystem
(system:
let
config = {};
overlays = [
# This is an overlay we apply on top of Nixpkgs with some of our
# own packages defined.
(final: prev: {
# A Haskell package set with our own overrides and packages defined.
myHaskellPackages = final.haskellPackages.override {
overrides = hfinal: hprev: {
# This is our local Haskell package.
package =
hfinal.callCabal2nix "package" ./. {};
};
};
# This is just a convenient shortcut to our package from the
# top-level of Nixpkgs. We're also applying the
# justStaticExecutables function to our package in order to
# reduce the size of the output derivation.
package =
final.haskell.lib.compose.justStaticExecutables
final.myHaskellPackages.package;
# A Haskell development shell for our package that includes
# things like cabal and HLS.
myDevShell = final.myHaskellPackages.shellFor {
packages = p: [ p.package ];
nativeBuildInputs = [
final.cabal-install
final.haskellPackages.haskell-language-server
];
};
})
];
# Our full Nixpkgs with the above overlay applied.
pkgs = import nixpkgs { inherit config overlays system; };
in
{
packages.default = pkgs.package;
devShells.default = pkgs.myDevShell;
}
);
}
|
