add Geef.Revwalk module for Elixir

lib/geef.ex

@@ -12,6 +12,7 @@ defmodule Geef do
       alias Geef.Oid
       alias Geef.Reference
       alias Geef.Repository
+      alias Geef.Revwalk
       alias Geef.Signature
       alias Geef.Tree
       alias Geef.Tag

lib/geef/repository.ex

@@ -18,6 +18,7 @@ defmodule Geef.Repository do
   def gitdir(repo), do: :geef_repo.path(repo)
   def workdir(repo), do: :geef_repo.workdir(repo)
   def config(repo), do: :geef_repo.config(repo)
+  def revwalk(repo), do: :geef_repo.revwalk(repo)
 
   def reference_names(repo), do: :geef_repo.references(repo)
 end

lib/geef/revwalk.ex

@@ -0,0 +1,32 @@
+defmodule Geef.Revwalk do
+  import Geef
+  alias Geef.Object
+
+  def stop(walk), do: :geef_revwalk.stop(walk)
+
+  def open(repo) when is_pid(repo), do: Repository.revwalk(repo)
+  def open!(arg), do: open(arg) |> assert_ok
+
+  def push(walk, %Object{type: :commit, id: commit}), do: push(walk, commit)
+  def push(walk, commit), do: :geef_revwalk.push(walk, commit)
+
+  def hide(walk, %Object{type: :commit, id: commit}), do: hide(walk, commit)
+  def hide(walk, commit), do: :geef_revwalk.hide(walk, commit)
+
+  def simplify_first_parent(walk), do: :geef_revwalk.simplify_first_parent(walk)
+
+  def sorting(walk, flags \\ [])
+  def sorting(walk, flags) when is_list(flags) do
+    flags = Enum.map(flags, &compile_sorting_flag/1)
+    :geef_revwalk.sorting(walk, flags)
+  end
+  def sorting(walk, flag), do: sorting(walk, [flag])
+
+  def next(walk), do: :geef_revwalk.next(walk)
+
+  def reset(walk), do: :geef_revwalk.reset(walk)
+
+  defp compile_sorting_flag(:topological_sort), do: :toposort
+  defp compile_sorting_flag(:time_sort), do: :timesort
+  defp compile_sorting_flag(:reverse_sort), do: :reversesort
+end