From 3003e5e190bb566a978062a63247d250ec5c1c28 Mon Sep 17 00:00:00 2001
From: David Calavera <david.calavera@gmail.com>
Date: Thu, 24 Jul 2014 15:37:59 -0700
Subject: [PATCH] Add Repository#RevParse.

---
 revparse.go      | 54 ++++++++++++++++++++++++++++++++++++++++++++++++
 revparse_test.go |  1 +
 2 files changed, 55 insertions(+)
 create mode 100644 revparse.go
 create mode 100644 revparse_test.go

diff --git a/revparse.go b/revparse.go
new file mode 100644
index 0000000..f78867f
--- /dev/null
+++ b/revparse.go
@@ -0,0 +1,54 @@
+package git
+
+/*
+#include <git2.h>
+#include <git2/errors.h>
+
+extern void _go_git_revspec_free(git_revspec *revspec);
+*/
+import "C"
+import (
+	"runtime"
+	"unsafe"
+)
+
+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() {
+	runtime.SetFinalizer(r, nil)
+	r.From.Free()
+	r.To.Free()
+}
+
+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 {
+		return nil, MakeGitError(ecode)
+	}
+
+	return newRevSpecFrom(ptr, r), nil
+}
diff --git a/revparse_test.go b/revparse_test.go
new file mode 100644
index 0000000..cd99cdb
--- /dev/null
+++ b/revparse_test.go
@@ -0,0 +1 @@
+package git