add DiffTreeToIndex
This is equivalent to `git diff --cached <treeish` or `diff --cached`.
diff --git a/diff.go b/diff.go
index 565fcee..9a7ac78 100644
--- a/diff.go
+++ b/diff.go
@@ -622,6 +622,36 @@
return newDiffFromC(diffPtr), nil
}
+func (v *Repository) DiffTreeToIndex(oldTree *Tree, index *Index, opts *DiffOptions) (*Diff, error) {
+ var diffPtr *C.git_diff
+ var oldPtr *C.git_tree
+ var indexPtr *C.git_index
+
+ if oldTree != nil {
+ oldPtr = oldTree.cast_ptr
+ }
+
+ if index != nil {
+ indexPtr = index.ptr
+ }
+
+ copts, notifyData := diffOptionsToC(opts)
+ defer freeDiffOptions(copts)
+
+ runtime.LockOSThread()
+ defer runtime.UnlockOSThread()
+
+ ecode := C.git_diff_tree_to_index(&diffPtr, v.ptr, oldPtr, indexPtr, copts)
+ if ecode < 0 {
+ return nil, MakeGitError(ecode)
+ }
+
+ if notifyData != nil && notifyData.Diff != nil {
+ return notifyData.Diff, nil
+ }
+ return newDiffFromC(diffPtr), nil
+}
+
func (v *Repository) DiffTreeToWorkdirWithIndex(oldTree *Tree, opts *DiffOptions) (*Diff, error) {
var diffPtr *C.git_diff
var oldPtr *C.git_tree