Merge pull request #59 from libgit2/cmn/refs

Add a few reference utility functions

1 files changed, 49 insertions, 0 deletions

diff --git a/repository.go b/repository.go
index 933bafc..bf6aee5 100644
--- a/repository.go
+++ b/repository.go
@@ -342,3 +342,52 @@ func (v *Repository) RevparseSingle(spec string) (Object, error) {
 
 	return allocObject(ptr), 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 {
+	cname := C.CString(name)
+	defer C.free(unsafe.Pointer(cname))
+
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+	if ret := C.git_reference_ensure_log(v.ptr, cname); ret < 0 {
+		return LastError()
+	}
+
+	return nil
+}
+
+// HasLog returns whether there is a reflog for the given reference
+// name
+func (v *Repository) HasLog(name string) (bool, error) {
+	cname := C.CString(name)
+	defer C.free(unsafe.Pointer(cname))
+
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+	ret := C.git_reference_has_log(v.ptr, cname)
+	if ret < 0 {
+		return false, LastError()
+	}
+
+	return ret == 1, nil
+}
+
+// DwimReference looks up a reference by DWIMing its short name
+func (v *Repository) DwimReference(name string) (*Reference, error) {
+	cname := C.CString(name)
+	defer C.free(unsafe.Pointer(cname))
+
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+	var ptr *C.git_reference
+	if ret := C.git_reference_dwim(&ptr, v.ptr, cname); ret < 0 {
+		return nil, LastError()
+	}
+
+	return newReferenceFromC(ptr), nil
+}