Wrap git_revparse_single

lib/geef/revparse.ex

@@ -0,0 +1,17 @@
+defmodule Geef.Revparse do
+  import Geef
+  use Geef
+
+  @spec single(pid, iolist) :: {:ok, Object.t} | {:error, term}
+  def single(repo, str) do
+    case :geef_revparse.single(repo, str) do
+      {:ok, obj} ->
+        {:ok, Object.from_erl(obj)}
+      error -> error
+    end
+  end
+
+  @spec single!(pid, iolist) :: {:ok, Object.t}
+  def single!(repo, str), do: single(repo, str) |> assert_ok
+
+end