From 201f59f0d12d6e2ba1122b9247d0d110cfdb3680 Mon Sep 17 00:00:00 2001
From: Thomas Tuegel <ttuegel@gmail.com>
Date: Mon, 4 Apr 2016 19:45:42 -0500
Subject: [PATCH] shell.nix: optional profiling

Run with `nix-shell -A env --arg profiling true` to enable profiling.
---
 shell-profiling.nix | 10 ----------
 shell.nix           | 10 +++++++++-
 2 files changed, 9 insertions(+), 11 deletions(-)
 delete mode 100644 shell-profiling.nix

diff --git a/shell-profiling.nix b/shell-profiling.nix
deleted file mode 100644
index e6ceb80..0000000
--- a/shell-profiling.nix
+++ /dev/null
@@ -1,10 +0,0 @@
-with (import <nixpkgs> {}).pkgs;
-let haskellPackages = pkgs.haskellPackages.override {
-      overrides = self: super: {
-        mkDerivation = args: super.mkDerivation (args // {
-          enableLibraryProfiling = true;
-        });
-      };
-    };
-in
-(haskellPackages.callPackage ./. {}).env
diff --git a/shell.nix b/shell.nix
index f945183..4614f3e 100644
--- a/shell.nix
+++ b/shell.nix
@@ -1,8 +1,16 @@
-with (import <nixpkgs> {});
+{ nixpkgs ? import <nixpkgs> {}, profiling ? false }:
+
+with nixpkgs;
+
 let
   inherit (pkgs.haskell) lib;
   haskellPackages = pkgs.haskell.packages.ghc7103.override {
     overrides = self: super: {
+
+      mkDerivation = args: super.mkDerivation (args // {
+        enableLibraryProfiling = profiling;
+      });
+
       aeson = self.aeson_0_11_1_4;
       bifunctors = lib.dontHaddock self.bifunctors_5_2_1;
       comonad = lib.doJailbreak (lib.dontCheck super.comonad);