From 08db22eaf1d7a85788e9a35b2651f044c0e70cfa Mon Sep 17 00:00:00 2001
From: mitchell <70453897+667e-11@users.noreply.github.com>
Date: Mon, 10 Feb 2014 12:29:28 -0500
Subject: Improved compatibility of experimental winapi `os.execute()`;
 core/file_io.lua

---
 core/file_io.lua | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'core')

diff --git a/core/file_io.lua b/core/file_io.lua
index 73b70f3f..257eb5ef 100644
--- a/core/file_io.lua
+++ b/core/file_io.lua
@@ -460,7 +460,8 @@ if WIN32 then
     return file
   end
   os.execute = function(prog)
+    if not prog then return true end -- shell is available
     local code = winapi.execute(prog)
-    if code then return code == 0 and true or nil, 'exit', code end
+    return code == 0 and true or nil, 'exit', code
   end
 end
-- 
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