From a59c2b3e03c651bda205de432a074debbf126300 Mon Sep 17 00:00:00 2001
From: tv <tv@shackspace.de>
Date: Tue, 17 Mar 2015 07:47:09 +0100
Subject: [PATCH] lib shell-escape: use builtins.match

---
 lib/default.nix | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/lib/default.nix b/lib/default.nix
index c1663a7b8..995e3dbcd 100644
--- a/lib/default.nix
+++ b/lib/default.nix
@@ -40,5 +40,12 @@ in
   #setToList = setMap (_: v: v);
 
   shell-escape =
-    stringAsChars (c: if c == "\n" then ''"${c}"'' else "\\${c}");
+    let
+      isSafeChar = c: match "[-./0-9_a-zA-Z]" c != null;
+    in
+    stringAsChars (c:
+      if isSafeChar c then c
+      else if c == "\n" then "'\n'"
+      else "\\${c}");
+
 }