From 57f0fbfe5e6b2fc8d516f147f1e39dc8a8d94062 Mon Sep 17 00:00:00 2001
From: midipix <writeonce@midipix.org>
Date: Nov 11 2016 05:22:31 +0000
Subject: driver: show usage information if no other action needs to be taken.


---

diff --git a/src/driver/mdso_driver_ctx.c b/src/driver/mdso_driver_ctx.c
index 61cd77f..1538d95 100644
--- a/src/driver/mdso_driver_ctx.c
+++ b/src/driver/mdso_driver_ctx.c
@@ -207,6 +207,9 @@ int mdso_get_driver_ctx(
 			nunits++;
 	}
 
+	if (!nunits && !(cctx.drvflags & MDSO_DRIVER_VERSION))
+		return mdso_driver_usage(program,0,options,meta);
+
 	if (pretty && !strcmp(pretty,"yaml"))
 		cctx.fmtflags |= MDSO_PRETTY_YAML;