Add nix derivation

default.nix

@@ -0,0 +1,27 @@
+{
+  pkgs ? import (import ./pinned-nixpkgs.nix) {}
+}:
+
+let
+  script = ./time-ghc-modules;
+  process = ./scripts/process;
+  index = ./dist/index.html;
+
+in
+
+with pkgs;
+
+runCommand "time-ghc-modules" {
+  propagatedBuildInputs = [makeWrapper];
+  inherit script process index;
+} ''
+  mkdir -p $out/bin
+  cp $script $out/bin/time-ghc-modules
+  wrapProgram $out/bin/time-ghc-modules --prefix PATH : ${lib.makeBinPath [ sqlite ]}
+
+  mkdir -p $out/bin/scripts
+  ln -s $process $out/bin/scripts/process
+
+  mkdir -p $out/bin/dist
+  ln -s $index $out/bin/dist/index.html
+''

pinned-nixpkgs.nix

@@ -0,0 +1,6 @@
+
+builtins.fetchGit {
+  url = "https://github.com/NixOS/nixpkgs.git";
+  rev = "973910f5c31b9ba6c171c33a8bd7199990b14c72";
+  ref = "release-21.05";
+}

time-ghc-modules-nix

@@ -0,0 +1,6 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+SCRIPT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )"
+
+$(nix-build $SCRIPT_DIR)/bin/time-ghc-modules "$@"