From d7f0c3d171eec868a8c13bed2e076c65cbfbaabe Mon Sep 17 00:00:00 2001
From: tv <tv@shackspace.de>
Date: Sat, 17 Oct 2015 07:35:21 +0200
Subject: move maybe to krebs lib

---
 krebs/4lib/maybe.nix | 10 ++++++++++
 1 file changed, 10 insertions(+)
 create mode 100644 krebs/4lib/maybe.nix

(limited to 'krebs/4lib')

diff --git a/krebs/4lib/maybe.nix b/krebs/4lib/maybe.nix
new file mode 100644
index 00000000..5189c99a
--- /dev/null
+++ b/krebs/4lib/maybe.nix
@@ -0,0 +1,10 @@
+{ ... }:
+
+rec {
+  Just = x: { type = "maybe"; value = x; };
+  Nothing = { type = "maybe"; };
+  isMaybe = x: builtins.typeOf x == "set" && x.type or false == "maybe";
+  isJust = x: isMaybe x && builtins.hasAttr "value" x;
+  fromJust = x: assert isJust x; x.value;
+  catMaybes = xs: map fromJust (builtins.filter isJust xs);
+}
-- 
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