accel: Add enum to string helper

src/accel-attributes.c

@@ -117,3 +117,16 @@ get_accel_scale (GUdevDevice *device,
 	reset_accel_scale (scale_vec);
 	return TRUE;
 }
+
+const char *
+accel_location_to_string (AccelLocation location)
+{
+	switch (location) {
+	case ACCEL_LOCATION_DISPLAY:
+		return "display";
+	case ACCEL_LOCATION_BASE:
+		return "base";
+	default:
+		g_assert_not_reached ();
+	}
+}

src/accel-attributes.h

@@ -24,5 +24,6 @@ gboolean parse_accel_location (const char    *location,
                                AccelLocation *value);
 gboolean parse_accel_label (const char    *location,
                             AccelLocation *value);
+const char *accel_location_to_string (AccelLocation location);
 
 gboolean get_accel_scale (GUdevDevice *device, AccelScale *scale_vec);