Use the new Buildkite setup and build with Nix

.buildkite/pipeline.yml

@@ -1,6 +1,5 @@
 steps:
-  - label: "Run tests"
+  - label: Build and test
     command: |
-      . /var/lib/buildkite-agent/.nix-profile/etc/profile.d/nix.sh
-      nix-shell --run 'stack build --pedantic --test'
+      nix-build -A distributed-closure --no-out-link
     timeout: 10

default.nix

@@ -0,0 +1,29 @@
+{ pkgs ? (import ./nix/nixpkgs) }:
+
+let
+  compiler = "ghc865";
+  source = pkgs.lib.sourceByRegex ./. [
+    "^.*\.md$"
+    "^distributed-closure\.cabal$"
+    "^examples.*$"
+    "^src.*$"
+    "^tests.*$"
+  ];
+  haskellPackages = pkgs.haskell.packages.${compiler}.override {
+    overrides = distributedClosureOverlay;
+  };
+  distributedClosureOverlay = self: super: {
+    "distributed-closure" = super.callCabal2nix "distributed-closure" source { };
+  };
+in {
+  distributed-closure = haskellPackages.distributed-closure;
+  shell = haskellPackages.shellFor {
+    packages = ps: [
+      ps.distributed-closure
+    ];
+    buildInputs = [
+      haskellPackages.cabal-install
+      haskellPackages.ghcid
+    ];
+  };
+}

distributed-closure.cabal

@@ -4,7 +4,7 @@ synopsis: Serializable closures for distributed programming.
 description: See README.
 homepage: https://github.com/tweag/distributed-closure
 license: BSD3
-license-file: LICENSE
+license-file: LICENSE.md
 author: Mathieu Boespflug
 maintainer: m@tweag.io
 copyright: © Tweag I/O Limited

nix/nixpkgs/default.nix

@@ -0,0 +1,9 @@
+let
+  rev = "19.09";
+  sha256 = "0mhqhq21y5vrr1f30qd2bvydv4bbbslvyzclhw0kdxmkgg3z4c92";
+  nixpkgs = builtins.fetchTarball {
+    url = "https://github.com/NixOS/nixpkgs/archive/${rev}.tar.gz";
+    inherit sha256;
+  };
+  pkgs = import nixpkgs { config.allowUnfree = true; };
+in pkgs

nixpkgs.nix

@@ -1 +0,0 @@
-import (fetchTarball "https://github.com/nixos/nixpkgs/archive/b41e2cf0c47e82fb851bc21e97551fc46186747b.tar.gz")

shell.nix

@@ -1,11 +1,3 @@
-{pkgs ? import ./nixpkgs.nix {}}:
+{ pkgs ? (import ./nix/nixpkgs) }:
 
-with pkgs;
-
-mkShell {
-  LANG="C.UTF-8";
-  buildInputs = [
-    ghc
-    stack
-  ];
-}
+(import ./default.nix { inherit pkgs; }).shell

stack.yaml

@@ -1,7 +0,0 @@
-resolver: lts-14.19
-packages:
-- '.'
-
-system-ghc: true
-nix:
-  enable: false

stack.yaml.lock

@@ -1,12 +0,0 @@
-# This file was autogenerated by Stack.
-# You should not edit this file by hand.
-# For more information, please see the documentation at:
-#   https://docs.haskellstack.org/en/stable/lock_files
-
-packages: []
-snapshots:
-- completed:
-    size: 524155
-    url: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/lts/14/19.yaml
-    sha256: 9f79f6494473c9b46911364b94c4b5ef19ca8d35ebf62e46697cf651f198ee19
-  original: lts-14.19