1 files changed, 114 insertions, 0 deletions
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
+}