tvl-depot/users/wpcarro/buildHaskell/default.nix

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{ pkgs, ... }:
{
# Create a nix-shell for Haskell development.
shell = { deps }:
let
ghc = pkgs.haskellPackages.ghcWithPackages (hpkgs: deps hpkgs);
in
pkgs.mkShell {
buildInputs = [ ghc ];
};
# Build a Haskell executable. This assumes a project directory with a
# top-level Main.hs.
# - `name`: You can find the result at ./result/$name
# - `srcs`: Will be passed to `srcs` field of `pkgs.stdenv.mkDerivation`.
# - `deps`: A function that accepts `hpkgs` and returns a list of Haskell
# - `ghcExtensions`: A list of strings representing the language extensions to
# use.
program = { name, srcs, deps, ghcExtensions }:
let
ghc = pkgs.haskellPackages.ghcWithPackages (hpkgs: deps hpkgs);
in
pkgs.stdenv.mkDerivation {
name = name;
buildInputs = [ ];
srcs = srcs;
buildPhase = ''
${ghc}/bin/ghc -Wall Main.hs ${pkgs.lib.concatMapStrings (x: "-X${x} ") ghcExtensions}
'';
installPhase = ''
mkdir -p $out && mv Main $out/${name}
'';
};
}