Move RevSpec#From and RevSpec#To to struct methods.

revparse.go

@@ -14,39 +14,45 @@ import (
 
 type RevSpec struct {
 	ptr  *C.git_revspec
-	From Object
-	To   Object
 	repo *Repository
 }
 
 func newRevSpecFrom(ptr *C.git_revspec, repo *Repository) *RevSpec {
 	rev := &RevSpec{
 		ptr:  ptr,
-		From: allocObject(ptr.from, repo),
-		To:   allocObject(ptr.to, repo),
 		repo: repo,
 	}
-	runtime.SetFinalizer(rev, (*RevSpec).Free)
 
 	return rev
 }
 
-func (r *RevSpec) Free() {
+func (r *RevSpec) From() Object {
-	runtime.SetFinalizer(r, nil)
+	if r.ptr.from == nil {
-	r.From.Free()
+		return nil
-	r.To.Free()
+	}
+
+	return allocObject(r.ptr.from, r.repo)
+}
+
+func (r *RevSpec) To() Object {
+	if r.ptr.to == nil {
+		return nil
+	}
+
+	return allocObject(r.ptr.to, r.repo)
 }
 
 func (r *Repository) RevParse(spec string) (*RevSpec, error) {
 	cspec := C.CString(spec)
 	defer C.free(unsafe.Pointer(cspec))
+
 	var ptr *C.git_revspec
 
 	runtime.LockOSThread()
 	defer runtime.UnlockOSThread()
 
 	ecode := C.git_revparse(ptr, r.ptr, cspec)
-	if ecode < 0 {
+	if ecode != 0 {
 		return nil, MakeGitError(ecode)
 	}