From 0b2f16665d14795047c56feb001d08a2d50fde50 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Carlos=20Mart=C3=ADn=20Nieto?= <cmn@dwim.me>
Date: Wed, 6 Mar 2013 18:29:43 +0100
Subject: [PATCH] Wrap immutable refs

---
 reference.go  | 113 ++++++++++++++++++++++++++++++++++++++++++++++++++
 repository.go |  41 ++++++++++++++++++
 2 files changed, 154 insertions(+)
 create mode 100644 reference.go

diff --git a/reference.go b/reference.go
new file mode 100644
index 0000000..820d166
--- /dev/null
+++ b/reference.go
@@ -0,0 +1,113 @@
+package git
+
+/*
+#cgo pkg-config: libgit2
+#include <git2.h>
+#include <git2/errors.h>
+*/
+import "C"
+import (
+	"runtime"
+	"unsafe"
+)
+
+var (
+	SYMBOLIC = C.GIT_REF_SYMBOLIC
+	OID      = C.GIT_REF_OID
+)
+
+type Reference struct {
+	ptr *C.git_reference
+}
+
+func newReferenceFromC(ptr *C.git_reference) *Reference {
+	ref := &Reference{ptr}
+	runtime.SetFinalizer(ref, (*Reference).Free)
+
+	return ref
+}
+
+func (v *Reference) SetSymbolicTarget(target string) (*Reference, error) {
+	var ptr *C.git_reference
+	ctarget := C.CString(target)
+	defer C.free(unsafe.Pointer(ctarget))
+
+	ret := C.git_reference_symbolic_set_target(&ptr, v.ptr, ctarget)
+	if ret < 0 {
+		return nil, LastError()
+	}
+
+	return newReferenceFromC(ptr), nil
+}
+
+func (v *Reference) SetTarget(target *Oid) (*Reference, error) {
+	var ptr *C.git_reference
+
+	ret := C.git_reference_set_target(&ptr, v.ptr, target.toC())
+	if ret < 0 {
+		return nil, LastError()
+	}
+
+	return newReferenceFromC(ptr), nil
+}
+
+func (v *Reference) Resolve() (*Reference, error) {
+	var ptr *C.git_reference
+
+	ret := C.git_reference_resolve(&ptr, v.ptr)
+	if ret < 0 {
+		return nil, LastError()
+	}
+
+	return newReferenceFromC(ptr), nil
+}
+
+func (v *Reference) Rename(name string, force bool) (*Reference, error) {
+	var ptr *C.git_reference
+	cname := C.CString(name)
+	defer C.free(unsafe.Pointer(cname))
+
+	ret := C.git_reference_rename(&ptr, v.ptr, cname, cbool(force))
+
+	if ret < 0 {
+		return nil, LastError()
+	}
+
+	return newReferenceFromC(ptr), nil
+}
+
+func (v *Reference) Target() *Oid {
+	return newOidFromC(C.git_reference_target(v.ptr))
+}
+
+func (v *Reference) SymbolicTarget() string {
+	cstr := C.git_reference_symbolic_target(v.ptr)
+	if cstr == nil {
+		return ""
+	}
+
+	return C.GoString(cstr)
+}
+
+func (v *Reference) Delete() error {
+	ret := C.git_reference_delete(v.ptr)
+
+	if ret < 0 {
+		return LastError()
+	}
+
+	return nil
+}
+
+func (v *Reference) Name() string {
+	return C.GoString(C.git_reference_name(v.ptr))
+}
+
+func (v *Reference) Type() int {
+	return int(C.git_reference_type(v.ptr))
+}
+
+func (v *Reference) Free() {
+	runtime.SetFinalizer(v, nil)
+	C.git_reference_free(v.ptr)
+}
diff --git a/repository.go b/repository.go
index 4cc8c5d..2e53a01 100644
--- a/repository.go
+++ b/repository.go
@@ -103,6 +103,47 @@ func (v *Repository) LookupBlob(o *Oid) (*Blob, error) {
 	return blob, nil
 }
 
+func (v *Repository) LookupReference(name string) (*Reference, error) {
+	cname := C.CString(name)
+	defer C.free(unsafe.Pointer(cname))
+	var ptr *C.git_reference
+
+	ecode := C.git_reference_lookup(&ptr, v.ptr, cname)
+	if ecode < 0 {
+		return nil, LastError()
+	}
+
+	return newReferenceFromC(ptr), nil
+}
+
+func (v *Repository) CreateReference(name string, oid *Oid, force bool) (*Reference, error) {
+	cname := C.CString(name)
+	defer C.free(unsafe.Pointer(cname))
+	var ptr *C.git_reference
+
+	ecode := C.git_reference_create(&ptr, v.ptr, cname, oid.toC(), cbool(force))
+	if ecode < 0 {
+		return nil, LastError()
+	}
+
+	return newReferenceFromC(ptr), nil
+}
+
+func (v *Repository) CreateSymbolicReference(name, target string, force bool) (*Reference, error) {
+	cname := C.CString(name)
+	defer C.free(unsafe.Pointer(cname))
+	ctarget := C.CString(target)
+	defer C.free(unsafe.Pointer(ctarget))
+	var ptr *C.git_reference
+
+	ecode := C.git_reference_symbolic_create(&ptr, v.ptr, cname, ctarget, cbool(force))
+	if ecode < 0 {
+		return nil, LastError()
+	}
+
+	return newReferenceFromC(ptr), nil
+}
+
 func (v *Repository) Walk() (*RevWalk, error) {
 	walk := new(RevWalk)
 	ecode := C.git_revwalk_new(&walk.ptr, v.ptr)