From 524cc7967be53176108e5c703818ccdd18882100 Mon Sep 17 00:00:00 2001
From: Mark Probst <mark.probst@gmail.com>
Date: Wed, 11 Mar 2015 16:12:39 -0700
Subject: [PATCH] Add DiffIndexToWorkdir

---
 diff.go | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/diff.go b/diff.go
index 54e4a92..23469f2 100644
--- a/diff.go
+++ b/diff.go
@@ -620,3 +620,28 @@ func (v *Repository) DiffTreeToWorkdirWithIndex(oldTree *Tree, opts *DiffOptions
 	}
 	return newDiffFromC(diffPtr), nil
 }
+
+func (v *Repository) DiffIndexToWorkdir(index *Index, opts *DiffOptions) (*Diff, error) {
+	var diffPtr *C.git_diff
+	var indexPtr *C.git_index
+
+	if index != nil {
+		indexPtr = index.ptr
+	}
+
+	copts, notifyData := diffOptionsToC(opts)
+	defer freeDiffOptions(copts)
+
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+	ecode := C.git_diff_index_to_workdir(&diffPtr, v.ptr, indexPtr, copts)
+	if ecode < 0 {
+		return nil, MakeGitError(ecode)
+	}
+
+	if notifyData != nil && notifyData.Diff != nil {
+		return notifyData.Diff, nil
+	}
+	return newDiffFromC(diffPtr), nil
+}