diff --git a/.envrc b/.envrc
new file mode 100644
index 0000000..051d09d
--- /dev/null
+++ b/.envrc
@@ -0,0 +1 @@
+eval "$(lorri direnv)"
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..b2be92b
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+result
diff --git a/.within/test.moon b/.within/test.moon
new file mode 100644
index 0000000..78ef385
--- /dev/null
+++ b/.within/test.moon
@@ -0,0 +1,6 @@
+run = (cmd) ->
+  with io.popen cmd, "r"
+    print \read "*a"
+    \close!
+
+run "./test.sh"
diff --git a/default.nix b/default.nix
new file mode 100644
index 0000000..24558d9
--- /dev/null
+++ b/default.nix
@@ -0,0 +1,23 @@
+{ pkgs ? import <nixpkgs> { }, lua ? pkgs.lua5_3
+, luaPackages ? pkgs.lua53Packages }:
+
+with pkgs;
+with luaPackages;
+
+buildLuarocksPackage {
+  pname = "ln";
+  version = "0.2.0-1";
+
+  src = fetchurl {
+    url = "https://luarocks.org/ln-0.2.0-1.src.rock";
+    sha256 = "0ff0139d8fkyp35csfs75b1jn9q37v5y35wzml82ff35k0sgwkam";
+  };
+  propagatedBuildInputs = [ lua dkjson ];
+
+  meta = with lib; {
+    homepage = "https://tulpa.dev/cadey/lua-ln";
+    description = "The natural log function";
+    license.fullName = "0bsd";
+  };
+}
+
diff --git a/ln-0.2.1-1.rockspec b/ln-0.2.1-1.rockspec
new file mode 100644
index 0000000..326ab56
--- /dev/null
+++ b/ln-0.2.1-1.rockspec
@@ -0,0 +1,20 @@
+package = "ln"
+version = "scm-1"
+source = {
+   url = "git+https://tulpa.dev/cadey/lua-ln"
+}
+description = {
+   homepage = "https://tulpa.dev/cadey/lua-ln",
+   license = "0bsd",
+   summary = "The natural log function"
+}
+dependencies = {
+   "lua ~> 5.1",
+   "dkjson"
+}
+build = {
+   type = "builtin",
+   modules = {
+      ln = "src/ln.lua"
+   }
+}
diff --git a/ln-scm-1.rockspec b/ln-scm-1.rockspec
index 2da6d08..326ab56 100644
--- a/ln-scm-1.rockspec
+++ b/ln-scm-1.rockspec
@@ -9,7 +9,7 @@ description = {
    summary = "The natural log function"
 }
 dependencies = {
-   "lua ~> 5.3",
+   "lua ~> 5.1",
    "dkjson"
 }
 build = {
diff --git a/shell.nix b/shell.nix
new file mode 100644
index 0000000..efe0a28
--- /dev/null
+++ b/shell.nix
@@ -0,0 +1,13 @@
+{ pkgs ? import <nixpkgs> { } }:
+
+let lua = pkgs.lua5_3.withPackages (ps: with ps; [ dkjson ]);
+
+in pkgs.mkShell {
+  buildInputs = with pkgs;
+    with lua53Packages; [
+      luarocks-nix
+      lua
+      busted
+      moonscript
+    ];
+}
diff --git a/spec/ln_spec.moon b/spec/ln_spec.moon
new file mode 100644
index 0000000..9287ad4
--- /dev/null
+++ b/spec/ln_spec.moon
@@ -0,0 +1,12 @@
+ln = require "ln"
+
+describe "moonscript tests", ->
+  lgr = ln.default_logger
+  msg = ""
+  lgr.filters = {
+      (message) -> msg = message,
+    }
+
+  it "can log", ->
+    ln.log {foo: "bar"}
+    assert.truthy string.find msg, "foo=bar"
diff --git a/test.sh b/test.sh
index 465d7de..6b033cb 100755
--- a/test.sh
+++ b/test.sh
@@ -1,3 +1,10 @@
-#!/bin/sh
+#!/usr/bin/env bash
+
+set -e
+set -x
+
+nix-shell -p lua5_1 -p lua51Packages.busted -p lua51Packages.moonscript --run "busted"
+nix-shell -p lua5_2 -p lua52Packages.busted -p lua52Packages.moonscript --run "busted"
+nix-shell -p lua5_3 -p lua53Packages.busted -p lua53Packages.moonscript --run "busted"
+nix-shell -p luajit -p luajitPackages.busted -p luajitPackages.moonscript --run "busted"
 
-busted --defer-print