3 files changed, 172 insertions, 17 deletions
diff --git a/repository.go b/repository.go
index 8cc966c..5b4e806 100644
--- a/repository.go
+++ b/repository.go
@@ -469,23 +469,6 @@ func (v *Repository) TreeBuilderFromTree(tree *Tree) (*TreeBuilder, error) {
 	return bld, nil
 }
 
-func (v *Repository) RevparseSingle(spec string) (Object, error) {
-	cspec := C.CString(spec)
-	defer C.free(unsafe.Pointer(cspec))
-
-	var ptr *C.git_object
-
-	runtime.LockOSThread()
-	defer runtime.UnlockOSThread()
-
-	ecode := C.git_revparse_single(&ptr, v.ptr, cspec)
-	if ecode < 0 {
-		return nil, MakeGitError(ecode)
-	}
-
-	return allocObject(ptr, v), nil
-}
-
 // EnsureLog ensures that there is a reflog for the given reference
 // name and creates an empty one if necessary.
 func (v *Repository) EnsureLog(name string) error {
diff --git a/revparse.go b/revparse.go
new file mode 100644
index 0000000..9e0070e
--- /dev/null
+++ b/revparse.go
@@ -0,0 +1,114 @@
+package git
+
+/*
+#include <git2.h>
+#include <git2/errors.h>
+
+extern void _go_git_revspec_free(git_revspec *revspec);
+*/
+import "C"
+import (
+	"runtime"
+	"unsafe"
+)
+
+type RevparseFlag int
+
+const (
+	RevparseSingle    RevparseFlag = C.GIT_REVPARSE_SINGLE
+	RevparseRange                  = C.GIT_REVPARSE_RANGE
+	RevparseMergeBase              = C.GIT_REVPARSE_MERGE_BASE
+)
+
+type Revspec struct {
+	to    Object
+	from  Object
+	flags RevparseFlag
+}
+
+func (rs *Revspec) To() Object {
+	return rs.to
+}
+
+func (rs *Revspec) From() Object {
+	return rs.from
+}
+
+func (rs *Revspec) Flags() RevparseFlag {
+	return rs.flags
+}
+
+func newRevspecFromC(ptr *C.git_revspec, repo *Repository) *Revspec {
+	var to Object
+	var from Object
+
+	if ptr.to != nil {
+		to = allocObject(ptr.to, repo)
+	}
+
+	if ptr.from != nil {
+		from = allocObject(ptr.from, repo)
+	}
+
+	return &Revspec{
+		to:    to,
+		from:  from,
+		flags: RevparseFlag(ptr.flags),
+	}
+}
+
+func (r *Repository) Revparse(spec string) (*Revspec, error) {
+	cspec := C.CString(spec)
+	defer C.free(unsafe.Pointer(cspec))
+
+	var crevspec C.git_revspec
+
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+	ecode := C.git_revparse(&crevspec, r.ptr, cspec)
+	if ecode != 0 {
+		return nil, MakeGitError(ecode)
+	}
+
+	return newRevspecFromC(&crevspec, r), nil
+}
+
+func (v *Repository) RevparseSingle(spec string) (Object, error) {
+	cspec := C.CString(spec)
+	defer C.free(unsafe.Pointer(cspec))
+
+	var ptr *C.git_object
+
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+	ecode := C.git_revparse_single(&ptr, v.ptr, cspec)
+	if ecode < 0 {
+		return nil, MakeGitError(ecode)
+	}
+
+	return allocObject(ptr, v), nil
+}
+
+func (r *Repository) RevparseExt(spec string) (Object, *Reference, error) {
+	cspec := C.CString(spec)
+	defer C.free(unsafe.Pointer(cspec))
+
+	var obj *C.git_object
+	var ref *C.git_reference
+
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+	ecode := C.git_revparse_ext(&obj, &ref, r.ptr, cspec)
+	if ecode != 0 {
+		return nil, nil, MakeGitError(ecode)
+	}
+
+	if ref == nil {
+		return allocObject(obj, r), nil, nil
+	}
+
+	return allocObject(obj, r), newReferenceFromC(ref, r), nil
+}
diff --git a/revparse_test.go b/revparse_test.go
new file mode 100644
index 0000000..c046a20
--- /dev/null
+++ b/revparse_test.go
@@ -0,0 +1,58 @@
+package git
+
+import (
+	"os"
+	"testing"
+)
+
+func TestRevparse(t *testing.T) {
+	repo := createTestRepo(t)
+	defer os.RemoveAll(repo.Workdir())
+
+	commitId, _ := seedTestRepo(t, repo)
+
+	revSpec, err := repo.Revparse("HEAD")
+	checkFatal(t, err)
+
+	checkObject(t, revSpec.From(), commitId)
+}
+
+func TestRevparseSingle(t *testing.T) {
+	repo := createTestRepo(t)
+	defer os.RemoveAll(repo.Workdir())
+
+	commitId, _ := seedTestRepo(t, repo)
+
+	obj, err := repo.RevparseSingle("HEAD")
+	checkFatal(t, err)
+
+	checkObject(t, obj, commitId)
+}
+
+func TestRevparseExt(t *testing.T) {
+	repo := createTestRepo(t)
+	defer os.RemoveAll(repo.Workdir())
+
+	_, treeId := seedTestRepo(t, repo)
+
+	ref, err := repo.CreateReference("refs/heads/master", treeId, true, nil, "")
+	checkFatal(t, err)
+
+	obj, ref, err := repo.RevparseExt("master")
+	checkFatal(t, err)
+
+	checkObject(t, obj, treeId)
+	if ref == nil {
+		t.Fatalf("bad reference")
+	}
+}
+
+func checkObject(t *testing.T, obj Object, id *Oid) {
+	if obj == nil {
+		t.Fatalf("bad object")
+	}
+
+	if !obj.Id().Equal(id) {
+		t.Fatalf("bad object, expected %s, got %s", id.String(), obj.Id().String())
+	}
+}