From 112ff7833d4f3a233755b2fe856b2eb2b3723254 Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <edolstra@gmail.com>
Date: Fri, 14 Jul 2017 13:44:45 +0200
Subject: nix: Show help when no arguments are given

Fixes #1464.
---
 src/libutil/args.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'src/libutil/args.cc')

diff --git a/src/libutil/args.cc b/src/libutil/args.cc
index df7e040875d6..0eed4945418d 100644
--- a/src/libutil/args.cc
+++ b/src/libutil/args.cc
@@ -146,7 +146,7 @@ bool Args::processArgs(const Strings & args, bool finish)
         res = true;
     }
 
-    if (finish && !expectedArgs.empty())
+    if (finish && !expectedArgs.empty() && !expectedArgs.front().optional)
         throw UsageError("more arguments are required");
 
     return res;
-- 
cgit 1.4.1