fixing compile for modern ghc; adding nix build method

.gitignore

@@ -1,3 +1,6 @@
 /.dist-buildwrapper
 /cabal.sandbox.config
 /.project
+
+# Editor related:
+*~

MazesOfMonad.cabal

@@ -11,7 +11,7 @@ Category:            Game
 Maintainer:          jpmoresmau@gmail.com
 Synopsis:            Console-based Role Playing Game
 Build-Type:          Simple
-tested-with:         GHC==7.0.2
+tested-with:         GHC==8.4.3
 data-files:          README.txt, WHATSNEW.txt, TODO.txt
 cabal-version:       >= 1.6
 

default.nix

@@ -0,0 +1,9 @@
+with import <nixpkgs> { };
+let
+  monadMaze = (haskellPackages.callPackage ./mmaze.nix {});
+in stdenv.mkDerivation {
+  name = "maze-monad-env";
+  buildInputs = [
+    monadMaze
+  ];
+}

mmaze.nix

@@ -0,0 +1,17 @@
+{ mkDerivation, array, base, containers, directory, filepath, HUnit
+, mtl, old-locale, pretty, random, regex-posix, stdenv, time
+}:
+mkDerivation {
+  pname = "MazesOfMonad";
+  version = "1.0.9";
+  src = ./.;
+  isLibrary = false;
+  isExecutable = true;
+  enableSeparateDataOutput = true;
+  executableHaskellDepends = [
+    array base containers directory filepath HUnit mtl old-locale
+    pretty random regex-posix time
+  ];
+  description = "Console-based Role Playing Game";
+  license = stdenv.lib.licenses.bsd3;
+}

src/MoresmauJP/Rpg/Save.hs

@@ -16,7 +16,6 @@ import MoresmauJP.Rpg.MazeObjects
 import System.Directory
 import System.FilePath
 import System.IO
-import System.Locale
 
 import Text.Printf
 import System.IO.Error (catchIOError)
@@ -261,4 +260,4 @@ readBackup s=do
 
 
 
-
+