adding taskwarrior

pkgs/tools/misc/task/default.nix

@@ -0,0 +1,22 @@
+{stdenv, fetchurl, cmake}:
+
+stdenv.mkDerivation {
+  name = "task-2.1.2";
+
+  enableParallelBuilding = true;
+
+  src = fetchurl {
+    url = http://www.taskwarrior.org/download/task-2.1.2.tar.gz;
+    sha256 = "0diy72sgiyvfl6bdy7k3qwv3ijx2z1y477smkk6jsbbd9fsp2lfg";
+  };
+
+  buildInputs = [ cmake ];
+
+  meta = {
+    description = "GTD (getting things done) implementation";
+    homepage = http://taskwarrior.org;
+    license = stdenv.lib.licenses.mit;
+    maintainers = [stdenv.lib.maintainers.marcweber];
+    platforms = stdenv.lib.platforms.linux;
+  };
+}

pkgs/top-level/all-packages.nix

@@ -1525,6 +1525,8 @@ let
     autoconf = autoconf213;
   };
 
+  task = callPackage ../tools/misc/task { };
+
   tcpdump = callPackage ../tools/networking/tcpdump { };
 
   /*