47 lines
1.3 KiB
Nix
47 lines
1.3 KiB
Nix
{
|
|
# Builds a tiny Haskell executable from a local Cabal package, and
|
|
# provides a matching dev shell for editing and running it.
|
|
description = "A minimal Haskell project with Cabal and flakes";
|
|
|
|
inputs = {
|
|
nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
|
|
};
|
|
|
|
outputs =
|
|
{ self, nixpkgs, ... }:
|
|
let
|
|
system = "x86_64-linux";
|
|
pkgs = import nixpkgs { inherit system; };
|
|
inherit (pkgs) haskellPackages;
|
|
project = haskellPackages.callCabal2nix "mini-haskell" ./. { };
|
|
in
|
|
{
|
|
packages.${system}.default = project;
|
|
|
|
apps.${system}.default = {
|
|
type = "app";
|
|
program = "${self.packages.${system}.default}/bin/mini-haskell";
|
|
meta.description = "Run the minimal Haskell example.";
|
|
};
|
|
|
|
devShells.${system}.default = pkgs.mkShell {
|
|
packages = [
|
|
haskellPackages.ghc
|
|
pkgs.cabal-install
|
|
pkgs.haskell-language-server
|
|
];
|
|
};
|
|
|
|
checks.${system}.greeting = pkgs.runCommand "mini-haskell-greeting" { } ''
|
|
output="$(${self.packages.${system}.default}/bin/mini-haskell flakes)"
|
|
|
|
if [ "$output" = "hello, flakes, from Haskell and Nix" ]; then
|
|
echo ok > "$out"
|
|
else
|
|
echo "unexpected output: $output" >&2
|
|
exit 1
|
|
fi
|
|
'';
|
|
};
|
|
}
|