From abfc51a2af8d606583450068745e726436a65877 Mon Sep 17 00:00:00 2001
From: Vignesh Rajagopalan <me@aarvay.com>
Date: Fri, 27 Nov 2015 04:36:13 +0530
Subject: [PATCH] Add a hacky os x build solution

---
 mix.exs | 57 ++++++++++++++++++++++++++++++++++++++++++++++++---------
 1 file changed, 48 insertions(+), 9 deletions(-)

diff --git a/mix.exs b/mix.exs
index faf09a1..5c04fd7 100644
--- a/mix.exs
+++ b/mix.exs
@@ -5,7 +5,7 @@ defmodule GraphQL.Parser.Mixfile do
     [app: :graphql_parser,
      version: "0.0.1",
      elixir: "~> 1.1",
-     compilers: [:libgraphqlparser, :elixir, :app],
+     compilers: [:libgraphqlparser, :graphqlparsernif, :elixir, :app],
      build_embedded: Mix.env == :prod,
      start_permanent: Mix.env == :prod,
      deps: deps]
@@ -20,8 +20,22 @@ defmodule GraphQL.Parser.Mixfile do
   end
 end
 
+defmodule GraphQL.Parser.MixHelper do
+  def check_exit_status({res, exit_status_code}) do
+    if exit_status_code != 0 do
+      raise Mix.Error, message: """
+        Build command exited with status code: #{exit_status_code}.
+        Make sure you're running `mix compile` from project's root.
+      """
+    end
+
+    IO.binwrite res # verbose
+  end
+end
+
 defmodule Mix.Tasks.Compile.Libgraphqlparser do
   use Mix.Task
+  import GraphQL.Parser.MixHelper
 
   @shortdoc "Compiles libgraphqlparser"
 
@@ -49,15 +63,40 @@ defmodule Mix.Tasks.Compile.Libgraphqlparser do
         end
     end
   end
+end
 
-  defp check_exit_status({res, exit_status_code}) do
-    if exit_status_code != 0 do
-      raise Mix.Error, message: """
-        Build command exited with status code: #{exit_status_code}.
-        Make sure you're running `mix compile` from project's root.
-      """
-    end
+defmodule Mix.Tasks.Compile.Graphqlparsernif do
+  use Mix.Task
+  import GraphQL.Parser.MixHelper
 
-    IO.binwrite res # verbose
+  @shortdoc "Compiles the GraphQL.Parser NIF library"
+
+  def run(_) do
+
+    compiler_inputs = [
+      "-undefined", "dynamic_lookup", "-dynamiclib",
+      "-I", "/usr/local/include/graphqlparser",
+      "-I", "#{:code.root_dir ++ '/erts-' ++ :erlang.system_info(:version) ++ '/include' |> to_string}",
+      "-L", "/usr/local/lib",
+      "-l", "graphqlparser",
+      "src/graphqlparser_nif.c",
+      "-o", "graphqlparser.so"
+    ]
+
+    try do
+      System.cmd("gcc", compiler_inputs, stderr_to_stdout: true)
+        |> check_exit_status
+
+    rescue
+      e in Mix.Error ->
+        raise e
+      e in ErlangError ->
+        case e.original do
+          :enoent ->
+            raise Mix.Error, message: """
+              Please check if `cmake` and `make` are installed
+            """
+        end
+    end
   end
 end