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, 4 insertions, 4 deletions

diff --git a/cshared/blame_cshared.go b/cshared/blame_cshared.go
index 8cb55e8..0f31cea 100644
--- a/cshared/blame_cshared.go
+++ b/cshared/blame_cshared.go
@@ -13,7 +13,7 @@ func c_Blame_get_Path(b uint64) *C.char {
 	if !ok {
 		return nil
 	}
-	blame := obj.(*git.Blame)
+	blame := obj.(*git.BlameResult)
 	return C.CString(blame.Path)
 }
 
@@ -23,7 +23,7 @@ func c_Blame_get_Rev(b uint64) *C.char {
 	if !ok {
 		return nil
 	}
-	blame := obj.(*git.Blame)
+	blame := obj.(*git.BlameResult)
 	return CBytes(blame.Rev[:])
 }
 
@@ -33,7 +33,7 @@ func c_Blame_get_Lines_len(b uint64) int {
 	if !ok {
 		return 0
 	}
-	blame := obj.(*git.Blame)
+	blame := obj.(*git.BlameResult)
 	return len(blame.Lines)
 }
 
@@ -43,7 +43,7 @@ func c_Blame_get_Lines_item(b uint64, i int) {
 	if !ok {
 		return
 	}
-	blame := obj.(*git.Blame)
+	blame := obj.(*git.BlameResult)
 	line := blame.Lines[i]
 	_ = line
 }