From 6281eb123bcdefcaebbd973600f4d33772012025 Mon Sep 17 00:00:00 2001
From: Ryan Trinkle <ryan.trinkle@gmail.com>
Date: Sat, 2 Dec 2017 13:03:40 -0500
Subject: [PATCH] nixpkgs.lib: Add escapeNixString

---
 lib/strings.nix | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/lib/strings.nix b/lib/strings.nix
index aca9ef45e615..9cbd1494a2b5 100644
--- a/lib/strings.nix
+++ b/lib/strings.nix
@@ -219,6 +219,14 @@ rec {
   */
   escapeShellArgs = concatMapStringsSep " " escapeShellArg;
 
+  /* Turn a string into a Nix expression representing that string
+
+     Example:
+       escapeNixString "hello\${}\n"
+       => "\"hello\\\${}\\n\""
+  */
+  escapeNixString = s: escape ["$"] (builtins.toJSON s);
+
   /* Obsolete - use replaceStrings instead. */
   replaceChars = builtins.replaceStrings or (
     del: new: s: