migrate to nix for local dev

Author: ul

.envrc

@@ -0,0 +1 @@
+use_nix

Makefile

@@ -0,0 +1,31 @@
+{ pkgs ? import <nixpkgs> {} }:
+
+let
+  resilientVersion = builtins.replaceStrings [ "\n" " " ] [ "" "" ]
+    (builtins.readFile ./.resilient-version);
+
+  build = pkgs.writeShellScriptBin "build" ''
+    exec sile --luarocks-tree lua_modules -u inputters.silm ddd-reference.silm "$@"
+  '';
+in
+pkgs.mkShell {
+  buildInputs = with pkgs; [
+    sile
+    lua5_1
+    luarocks
+    gcc
+    gentium-plus
+    build
+  ];
+
+  FONTCONFIG_FILE = pkgs.makeFontsConf {
+    fontDirectories = [ pkgs.gentium-plus ];
+  };
+
+  shellHook = ''
+    echo "Installing resilient.sile ${resilientVersion}..."
+    luarocks --lua-version 5.1 --tree lua_modules install resilient.sile ${resilientVersion}
+
+    echo "Run 'build' to generate the PDF."
+  '';
+}