From 3294dd5ae6af61ec34de44ea5f8d8bd4904d74dc Mon Sep 17 00:00:00 2001
From: Tristan Sloughter <t@crashfast.com>
Date: Sat, 16 May 2015 13:03:04 -0500
Subject: don't return value as string if not a printable string

---
 src/rlx_util.erl | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/rlx_util.erl b/src/rlx_util.erl
index 2251b4f..8a54ae6 100644
--- a/src/rlx_util.erl
+++ b/src/rlx_util.erl
@@ -133,7 +133,12 @@ is_error(_) ->
 optional_to_string(undefined) ->
     "";
 optional_to_string(Value) when is_list(Value) ->
-    Value.
+    case io_lib:printable_list(Value) of
+        true ->
+            Value;
+        false ->
+            ""
+    end.
 
 %% @doc expand wildcards and names in the given paths
 -spec wildcard_paths([file:filename_all()]) -> [string()].
-- 
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