Add some nix tooling for easier dev

Author: mjrussell

.envrc

@@ -0,0 +1 @@
+use flake

.gitignore

@@ -11,3 +11,4 @@
 /.spago/
 /output-pulp/
 .psc-*
+/.direnv

flake.lock

@@ -0,0 +1,34 @@
+{
+  description = "Provide an environment for working in this repo";
+
+  # to handle mac and linux
+  inputs.flake-utils.url = "github:numtide/flake-utils";
+
+  # we want to use a consistent nixpkgs across developers.
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+
+  outputs = all@{ self, nixpkgs, flake-utils, ... }:
+    flake-utils.lib.eachDefaultSystem (system:
+      let
+        pkgs = import nixpkgs {
+          inherit system;
+        };
+        packages =
+          let
+            # everything we want available in our development environment that isn't managed by
+            # npm, spago
+            # we do not differentiate between libraries needed for building and tools at the moment.
+            sharedPackages = with pkgs; [
+              nodejs-16_x
+            ];
+          in
+            sharedPackages;
+      in {
+        # produce our actual shell
+        devShell = pkgs.mkShell rec {
+          # make our packages available
+          buildInputs = packages;
+        };
+      }
+    );
+}

flake.nix

@@ -0,0 +1,32 @@
+# Universal shell for PureScript repos
+{ pkgs ? import (builtins.fetchGit {
+  # https://github.com/NixOS/nixpkgs/releases/tag/21.11
+  url = "https://github.com/nixos/nixpkgs/";
+  ref = "refs/tags/21.11";
+  rev = "a7ecde854aee5c4c7cd6177f54a99d2c1ff28a31";
+  }) {}
+}:
+let
+  easy-ps-src = builtins.fetchGit {
+    url = "https://github.com/justinwoo/easy-purescript-nix.git";
+    ref = "master";
+    rev = "0ad5775c1e80cdd952527db2da969982e39ff592";
+  };
+  easy-ps = import easy-ps-src { inherit pkgs; };
+in
+pkgs.mkShell {
+  nativeBuildInputs = [
+    easy-ps.purs-0_15_0
+    easy-ps.spago
+    easy-ps.pulp-16_0_0-0
+    easy-ps.psc-package
+    easy-ps.purs-tidy
+    pkgs.nodejs-16_x
+    pkgs.nodePackages.bower
+  ];
+  LC_ALL = "C.UTF-8"; # https://github.com/purescript/spago/issues/507
+  # https://github.com/purescript/spago#install-autocompletions-for-bash
+  shellHook = ''
+    source <(spago --bash-completion-script `which spago`)
+  '';
+}