plumbing/object: move difftree to object package

- To avoid ciclic dependency errors, we move all the difftree files to object package.
- Added Diff method to Tree object.

1 files changed, 0 insertions, 121 deletions

diff --git a/plumbing/difftree/change.go b/plumbing/difftree/change.go
deleted file mode 100644
index c636577..0000000
--- a/plumbing/difftree/change.go
+++ /dev/null
@@ -1,121 +0,0 @@
-package difftree
-
-import (
-	"bytes"
-	"fmt"
-	"strings"
-
-	"srcd.works/go-git.v4/plumbing/object"
-	"srcd.works/go-git.v4/utils/merkletrie"
-)
-
-// Change values represent a detected change between two git trees.  For
-// modifications, From is the original status of the node and To is its
-// final status.  For insertions, From is the zero value and for
-// deletions To is the zero value.
-type Change struct {
-	From ChangeEntry
-	To   ChangeEntry
-}
-
-var empty = ChangeEntry{}
-
-// Action returns the kind of action represented by the change, an
-// insertion, a deletion or a modification.
-func (c *Change) Action() (merkletrie.Action, error) {
-	if c.From == empty && c.To == empty {
-		return merkletrie.Action(0),
-			fmt.Errorf("malformed change: empty from and to")
-	}
-	if c.From == empty {
-		return merkletrie.Insert, nil
-	}
-	if c.To == empty {
-		return merkletrie.Delete, nil
-	}
-
-	return merkletrie.Modify, nil
-}
-
-// Files return the files before and after a change.
-// For insertions from will be nil. For deletions to will be nil.
-func (c *Change) Files() (from, to *object.File, err error) {
-	action, err := c.Action()
-	if err != nil {
-		return
-	}
-
-	if action == merkletrie.Insert || action == merkletrie.Modify {
-		to, err = c.To.Tree.TreeEntryFile(&c.To.TreeEntry)
-		if err != nil {
-			return
-		}
-	}
-
-	if action == merkletrie.Delete || action == merkletrie.Modify {
-		from, err = c.From.Tree.TreeEntryFile(&c.From.TreeEntry)
-		if err != nil {
-			return
-		}
-	}
-
-	return
-}
-
-func (c *Change) String() string {
-	action, err := c.Action()
-	if err != nil {
-		return fmt.Sprintf("malformed change")
-	}
-
-	return fmt.Sprintf("<Action: %s, Path: %s>", action, c.name())
-}
-
-func (c *Change) name() string {
-	if c.From != empty {
-		return c.From.Name
-	}
-
-	return c.To.Name
-}
-
-// ChangeEntry values represent a node that has suffered a change.
-type ChangeEntry struct {
-	// Full path of the node using "/" as separator.
-	Name string
-	// Parent tree of the node that has changed.
-	Tree *object.Tree
-	// The entry of the node.
-	TreeEntry object.TreeEntry
-}
-
-// Changes represents a collection of changes between two git trees.
-// Implements sort.Interface lexicographically over the path of the
-// changed files.
-type Changes []*Change
-
-func (c Changes) Len() int {
-	return len(c)
-}
-
-func (c Changes) Swap(i, j int) {
-	c[i], c[j] = c[j], c[i]
-}
-
-func (c Changes) Less(i, j int) bool {
-	return strings.Compare(c[i].name(), c[j].name()) < 0
-}
-
-func (c Changes) String() string {
-	var buffer bytes.Buffer
-	buffer.WriteString("[")
-	comma := ""
-	for _, v := range c {
-		buffer.WriteString(comma)
-		buffer.WriteString(v.String())
-		comma = ", "
-	}
-	buffer.WriteString("]")
-
-	return buffer.String()
-}