move plumbing from top level package to plumbing (#183)

* plumbing: rename Object -> EncodedObject.

* plumbing/storer: rename ObjectStorer -> EncodedObjectStorer.

* move difftree to plumbing/difftree.

* move diff -> utils/diff

* make Object/Tag/Blob/Tree/Commit/File depend on storer.

* Object and its implementations now depend only on
  storer.EncodedObjectStorer, not git.Repository.
* Tests are decoupled accordingly.

* move Object/Commit/File/Tag/Tree to plumbing/object.

* move Object/Commit/File/Tag/Tree to plumbing/object.
* move checkClose to utils/ioutil.

* move RevListObjects to plumbing/revlist.Objects.

* move DiffTree to plumbing/difftree package.

* rename files with plural nouns to singular

* plumbing/object: add GetBlob/GetCommit/GetTag/GetTree.

1 files changed, 0 insertions, 38 deletions

diff --git a/commit_walker_test.go b/commit_walker_test.go
deleted file mode 100644
index cf239bc..0000000
--- a/commit_walker_test.go
+++ /dev/null
@@ -1,38 +0,0 @@
-package git
-
-import . "gopkg.in/check.v1"
-
-type CommitWalkerSuite struct {
-	BaseSuite
-}
-
-var _ = Suite(&CommitWalkerSuite{})
-
-func (s *CommitWalkerSuite) TestWalkerNext(c *C) {
-	r, err := s.Repository.Head()
-	c.Assert(err, IsNil)
-
-	commit, err := s.Repository.Commit(r.Hash())
-	c.Assert(err, IsNil)
-
-	var commits []*Commit
-
-	WalkCommitHistory(commit, func(c *Commit) error {
-		commits = append(commits, c)
-		return nil
-	})
-
-	SortCommits(commits)
-	c.Assert(commits, HasLen, 8)
-
-	expected := []string{
-		"b029517f6300c2da0f4b651b8642506cd6aaf45d", "b8e471f58bcbca63b07bda20e428190409c2db47",
-		"35e85108805c84807bc66a02d91535e1e24b38b9", "a5b8b09e2f8fcb0bb99d3ccb0958157b40890d69",
-		"1669dce138d9b841a518c64b10914d88f5e488ea", "af2d6a6954d532f8ffb47615169c8fdf9d383a1a",
-		"918c48b83bd081e863dbe1b80f8998f058cd8294", "6ecf0ef2c2dffb796033e5a02219af86ec6584e5",
-	}
-
-	for i, commit := range commits {
-		c.Assert(commit.Hash.String(), Equals, expected[i])
-	}
-}