add Geef.Revwalk module for Elixir

test/revwalk_test.erl

@@ -4,10 +4,10 @@
 
 repo_test_() ->
     case os:getenv("GEEF_RESOURCES") of
-	false ->
-	    [];
-	_ ->
-	    {foreach, fun start/0, fun stop/1, [fun amount_test/1]}
+    false ->
+        [];
+    _ ->
+        {foreach, fun start/0, fun stop/1, [fun amount_test/1]}
     end.
 
 start() ->
@@ -18,10 +18,10 @@ start() ->
 
 count_walk(Walk, Acc) ->
     case geef_revwalk:next(Walk) of
-	{ok, _} ->
-	    count_walk(Walk, Acc + 1);
-	{error, iterover} ->
-	    Acc
+    {ok, _} ->
+        count_walk(Walk, Acc + 1);
+    {error, iterover} ->
+        Acc
     end.
 
 amount_test(Repo) ->

test/revwalk_test.exs

@@ -0,0 +1,29 @@
+defmodule RevwalkTest do
+  use ExUnit.Case
+  use Geef
+  import RepoHelpers
+
+
+  setup do
+    {repo, path, head, boring_ancestor} = tmp_commit_line
+    Process.link(repo)
+    {:ok, walk} = Repository.revwalk(repo)
+    on_exit(fn -> File.rm_rf!(path) end)
+    {:ok, [walk: walk, head: head, boring_ancestor: boring_ancestor]}
+  end
+
+  test "walk and count", meta do
+    walk = meta[:walk]
+    Revwalk.push(walk, meta[:head])
+    Revwalk.hide(walk, meta[:boring_ancestor])
+    assert 3 = count_walk(walk)
+  end
+
+  defp count_walk walk, acc \\ 0
+  defp count_walk walk, acc do
+    case Revwalk.next(walk) do
+      {:ok, _} -> count_walk(walk, acc + 1)
+      {:error, :iterover} -> acc
+    end
+  end
+end

test/test_helper.exs

@@ -1,12 +1,33 @@
 ExUnit.start
 
 defmodule RepoHelpers do
+  use Geef
+
   def tmp_bare do
     {a, b, c} = :erlang.timestamp()
     n = node()
     dir = :io_lib.format("geef-~p~p~p~p.git", [n, a, b, c])
     path = Path.join(System.tmp_dir!, dir)
-    {:ok, repo} = Geef.Repository.init(path, true)
+    {:ok, repo} = Repository.init(path, true)
     {repo, path}
   end
+
+  def tmp_commit_line do
+    {repo, path} = tmp_bare()
+    sig = Signature.now("Geef Test", "test@geef")
+    message = "commit message"
+    {:ok, idx} = Index.new()
+    {:ok, empty_index} = Index.write_tree(idx, repo)
+
+    {:ok, c} = Commit.create(repo, sig, sig, message, empty_index, [])
+    {:ok, c} = Commit.create(repo, sig, sig, message, empty_index, [c])
+    {:ok, c} = Commit.create(repo, sig, sig, message, empty_index, [c])
+    boring_ancestor = c
+    {:ok, c} = Commit.create(repo, sig, sig, message, empty_index, [c])
+    {:ok, c} = Commit.create(repo, sig, sig, message, empty_index, [c])
+    {:ok, c} = Commit.create(repo, sig, sig, message, empty_index, [c])
+    head = c
+
+    {repo, path, head, boring_ancestor}
+  end
 end