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, 45 deletions

diff --git a/diff/diff.go b/diff/diff.go
deleted file mode 100644
index b840ad6..0000000
--- a/diff/diff.go
+++ /dev/null
@@ -1,45 +0,0 @@
-// Package diff implements line oriented diffs, similar to the ancient
-// Unix diff command.
-//
-// The current implementation is just a wrapper around Sergi's
-// go-diff/diffmatchpatch library, which is a go port of Neil
-// Fraser's google-diff-match-patch code
-package diff
-
-import (
-	"bytes"
-
-	"github.com/sergi/go-diff/diffmatchpatch"
-)
-
-// Do computes the (line oriented) modifications needed to turn the src
-// string into the dst string.
-func Do(src, dst string) (diffs []diffmatchpatch.Diff) {
-	dmp := diffmatchpatch.New()
-	wSrc, wDst, warray := dmp.DiffLinesToChars(src, dst)
-	diffs = dmp.DiffMain(wSrc, wDst, false)
-	diffs = dmp.DiffCharsToLines(diffs, warray)
-	return diffs
-}
-
-// Dst computes and returns the destination text.
-func Dst(diffs []diffmatchpatch.Diff) string {
-	var text bytes.Buffer
-	for _, d := range diffs {
-		if d.Type != diffmatchpatch.DiffDelete {
-			text.WriteString(d.Text)
-		}
-	}
-	return text.String()
-}
-
-// Src computes and returns the source text
-func Src(diffs []diffmatchpatch.Diff) string {
-	var text bytes.Buffer
-	for _, d := range diffs {
-		if d.Type != diffmatchpatch.DiffInsert {
-			text.WriteString(d.Text)
-		}
-	}
-	return text.String()
-}