Update nix setup, lets use nix.

nix/.nixpkgs/config.nix

@@ -1,12 +1,62 @@
-{
-  packageOverrides = super: let self = super.pkgs; in {
+{ pkgs }: {
+  packageOverrides = pkgs_: with pkgs_; {
+    default = with pkgs; buildEnv {
+      name = "default";
+      paths = [
+        ansible
+        ack
+        aria
+        iperf
+        curl
+        clang
+        git
+        gist
+        mercurial
+        docbook5
+        entr
+        emacs
+        gnupg1
+        gnutar
+        gnumake
+        sloccount
+        cloc
+        less
+        multitail
+        rlwrap
+        gdbm
+        mosh
+        htop
+        keychain
+        silver-searcher
+        aspell
+        aspellDicts.en
+        openssl
+        pigz
+        xz
+        pv
+        postgresql
+        python27Packages.youtube-dl
+        readline
+        rsync
+        sqlite
+        texLiveFull
+        tmux
+        tree
+        wget
+        wakelan
+        unzip
+        zip
+        upx
+      ];
+    };
     myHaskellEnv =
-      self.haskell.packages.ghc7102.ghcWithPackages
+      pkgs_.haskell.packages.ghc7102.ghcWithPackages
           (haskellPackages: with haskellPackages; [
               aeson
               arrows
               async
               bake
+              cabal-dependency-licenses
               cabal-install
               case-insensitive
               ghc-mod
@@ -17,12 +67,12 @@
               pandoc
               shake
               ShellCheck
-              Spock
               stack
               stylish-haskell
-              regex-posix
               wreq
               ]
           );
   };
+  allowUnfree = true;
+  allowBroken = true;
 }

nix/.profile.d/99-final-nix.sh

@@ -1,11 +1,25 @@
-# nix.profile.d/99-final-nix.sh
-
-# The nix installer put something like this into the .profile.
-# BAD INSTALLER NO COOKIE!
-if [ -e ${HOME}/.nix-profile/etc/profile.d/nix.sh ]; then
-  . ${HOME}/.nix-profile/etc/profile.d/nix.sh;
-  export NIX_PATH=${HOME}/src/github.com/NixOS/nixpkgs:nixpkgs=${HOME}/src/github.com/NixOS/nixpkgs
-  export NIX_CFLAGS_COMPILE="-idirafter /usr/include"
-  export NIX_CFLAGS_LINK="-L/usr/lib"
-  nix_env_setup
-fi
+# nix/profile.d/99-final-nix.sh
+
+nix_env_setup()
+{
+  # The nix installer put something like this into the .profile.
+  # BAD INSTALLER NO COOKIE!
+  if [ -e ${HOME}/.nix-profile/etc/profile.d/nix.sh ]; then
+      . ${HOME}/.nix-profile/etc/profile.d/nix.sh;
+      export NIX_PATH=${HOME}/src/github.com/NixOS/nixpkgs:nixpkgs=${HOME}/src/github.com/NixOS/nixpkgs
+      export NIX_CFLAGS_COMPILE="-idirafter /usr/include"
+      export NIX_CFLAGS_LINK="-L/usr/lib"
+
+      NIX_GHC=$(type -p ghc > /dev/null 2>&1)
+      if [ -n "$NIX_GHC" ]; then
+          eval $(grep export "$NIX_GHC")
+      fi
+  fi
+
+  nr()
+  {
+    nix-shell --run "$(echo $@)"
+  }
+}
+
+nix_env_setup