1 files changed, 29 insertions, 35 deletions
diff --git a/commit.go b/commit.go
index 559a1bd..52f7c01 100644
--- a/commit.go
+++ b/commit.go
@@ -9,7 +9,6 @@ import "C"
 
 import (
 	"runtime"
-	"time"
 	"unsafe"
 )
 
@@ -23,6 +22,10 @@ func (c Commit) Message() string {
 	return C.GoString(C.git_commit_message(c.cast_ptr))
 }
 
+func (c Commit) Summary() string {
+	return C.GoString(C.git_commit_summary(c.cast_ptr))
+}
+
 func (c Commit) Tree() (*Tree, error) {
 	var ptr *C.git_tree
 
@@ -69,48 +72,39 @@ func (c *Commit) ParentCount() uint {
 	return uint(C.git_commit_parentcount(c.cast_ptr))
 }
 
-// Signature
-
-type Signature struct {
-	Name  string
-	Email string
-	When  time.Time
-}
-
-func newSignatureFromC(sig *C.git_signature) *Signature {
-	// git stores minutes, go wants seconds
-	loc := time.FixedZone("", int(sig.when.offset)*60)
-	return &Signature{
-		C.GoString(sig.name),
-		C.GoString(sig.email),
-		time.Unix(int64(sig.when.time), 0).In(loc),
+func (c *Commit) Amend(refname string, author, committer *Signature, message string, tree *Tree) (*Oid, error) {
+	var cref *C.char
+	if refname == "" {
+		cref = nil
+	} else {
+		cref = C.CString(refname)
+		defer C.free(unsafe.Pointer(cref))
 	}
-}
 
-// the offset in mintes, which is what git wants
-func (v *Signature) Offset() int {
-	_, offset := v.When.Zone()
-	return offset / 60
-}
+	cmsg := C.CString(message)
+	defer C.free(unsafe.Pointer(cmsg))
 
-func (sig *Signature) toC() *C.git_signature {
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
 
-	if sig == nil {
-		return nil
+	authorSig, err := author.toC()
+	if err != nil {
+		return nil, err
 	}
+	defer C.git_signature_free(authorSig)
 
-	var out *C.git_signature
-
-	name := C.CString(sig.Name)
-	defer C.free(unsafe.Pointer(name))
+	committerSig, err := committer.toC()
+	if err != nil {
+		return nil, err
+	}
+	defer C.git_signature_free(committerSig)
 
-	email := C.CString(sig.Email)
-	defer C.free(unsafe.Pointer(email))
+	oid := new(Oid)
 
-	ret := C.git_signature_new(&out, name, email, C.git_time_t(sig.When.Unix()), C.int(sig.Offset()))
-	if ret < 0 {
-		return nil
+	cerr := C.git_commit_amend(oid.toC(), c.cast_ptr, cref, authorSig, committerSig, nil, cmsg, tree.cast_ptr)
+	if cerr < 0 {
+		return nil, MakeGitError(cerr)
 	}
 
-	return out
+	return oid, nil
 }