format/diff: unified diff encoder and public API

- Added Patch interface
- Added a Unified Diff encoder from Patches
- Added Change method to generate Patches
- Added Changes method to generate Patches
- Added Tree method to generate Patches
- Added Commit method to generate Patches

1 files changed, 12 insertions, 0 deletions

diff --git a/plumbing/object/change.go b/plumbing/object/change.go
index 2f702e4..729ff5a 100644
--- a/plumbing/object/change.go
+++ b/plumbing/object/change.go
@@ -78,6 +78,12 @@ func (c *Change) String() string {
 	return fmt.Sprintf("<Action: %s, Path: %s>", action, c.name())
 }
 
+// Patch returns a Patch with all the file changes in chunks. This
+// representation can be used to create several diff outputs.
+func (c *Change) Patch() (*Patch, error) {
+	return getPatch("", c)
+}
+
 func (c *Change) name() string {
 	if c.From != empty {
 		return c.From.Name
@@ -126,3 +132,9 @@ func (c Changes) String() string {
 
 	return buffer.String()
 }
+
+// Patch returns a Patch with all the changes in chunks. This
+// representation can be used to create several diff outputs.
+func (c Changes) Patch() (*Patch, error) {
+	return getPatch("", c...)
+}