haskell-silently: New package, v1.2.0.2.

Let's begin silently and add the first dependency in our ongoing roadmap of
butchering missing dependencies leading up to yesod-test:

         .---- yesod-test -------.
         |          |            |
         |          |            |
    .- hspec -.  wai-test    html-conduit -.
    |         |               |            |
    :         |               |  filesystem-conduit
    :    hspec-expectations   |
    :                         |
    :                tagstream-conduit
    :
    :
 silently <- Yay, our first victim, silently killed by a chainsaw:

  .,.,.,.,.,.,.||\      ,-. ROAWRR!
 ::::::::::::::   | o O `-'
  `'`'`'`'`'`'`---`

Signed-off-by: aszlig <aszlig@redmoonstudios.org>

pkgs/development/libraries/haskell/silently/default.nix

@@ -0,0 +1,14 @@
+{ cabal, deepseq }:
+
+cabal.mkDerivation (self: {
+  pname = "silently";
+  version = "1.2.0.2";
+  sha256 = "0qcprbjnh351hc9v12gww478qd4pw7wgpyjj1gmkx4mr80w0qmm1";
+  buildDepends = [ deepseq ];
+  meta = {
+    homepage = "https://github.com/trystan/silently";
+    description = "Prevent or capture writing to stdout and other handles";
+    license = self.stdenv.lib.licenses.bsd3;
+    platforms = self.ghc.meta.platforms;
+  };
+})

pkgs/top-level/haskell-packages.nix

@@ -1347,6 +1347,8 @@ let result = let callPackage = x : y : modifyPrio (newScope result.final x y);
 
   simpleSendfile = callPackage ../development/libraries/haskell/simple-sendfile {};
 
+  silently = callPackage ../development/libraries/haskell/silently {};
+
   skein = callPackage ../development/libraries/haskell/skein {};
 
   smallcheck = callPackage ../development/libraries/haskell/smallcheck {};