From 015720ef89b81d3d17b3aa7dcaa1e1489c0f87a8 Mon Sep 17 00:00:00 2001
From: tv <tv@shackspace.de>
Date: Fri, 28 Aug 2015 20:09:54 +0200
Subject: {tv/4lib shell-escape,krebs/4lib/shell.nix escape}

---
 krebs/4lib/default.nix |  1 +
 krebs/4lib/shell.nix   | 15 +++++++++++++++
 2 files changed, 16 insertions(+)
 create mode 100644 krebs/4lib/shell.nix

(limited to 'krebs')

diff --git a/krebs/4lib/default.nix b/krebs/4lib/default.nix
index b6758533..8b587dfb 100644
--- a/krebs/4lib/default.nix
+++ b/krebs/4lib/default.nix
@@ -14,5 +14,6 @@ builtins // lib // rec {
 
   dns = import ./dns.nix { inherit lib; };
   listset = import ./listset.nix { inherit lib; };
+  shell = import ./shell.nix { inherit lib; };
   tree = import ./tree.nix { inherit lib; };
 }
diff --git a/krebs/4lib/shell.nix b/krebs/4lib/shell.nix
new file mode 100644
index 00000000..48b220f8
--- /dev/null
+++ b/krebs/4lib/shell.nix
@@ -0,0 +1,15 @@
+{ lib, ... }:
+
+with builtins;
+with lib;
+
+rec {
+  escape =
+    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}");
+}
-- 
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