initial commit

.gitignore

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+# direnv
+.envrc
+.direnv

flake.lock

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+{
+  "nodes": {
+    "flake-utils": {
+      "locked": {
+        "lastModified": 1667395993,
+        "narHash": "sha256-nuEHfE/LcWyuSWnS8t12N1wc105Qtau+/OdUAjtQ0rA=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "5aed5285a952e0b949eb3ba02c12fa4fcfef535f",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1668650906,
+        "narHash": "sha256-JuiYfDO23O8oxUUOmhQflmOoJovyC5G4RjcYQMQjrRE=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "3a86856a13c88c8c64ea32082a851fefc79aa700",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

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+{
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs = { self, nixpkgs, flake-utils }:
+    flake-utils.lib.eachDefaultSystem (system:
+      let
+        pkgs = import nixpkgs { inherit system; };
+
+        runTests = pkgs.writeShellScript "runTests" ''
+          nix eval --impure --expr 'import ./lib.test.nix {}'
+        '';
+      in
+      {
+        apps.tests = {
+          type = "app";
+          program = toString runTests;
+        };
+
+      });
+}

lib.nix

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+let
+  inherit (builtins) isString isFloat isInt isBool isList concatStringsSep;
+
+  toLua = val:
+    if isList val then toLuaList val
+    else if isString val then toLuaStr val
+    else if isFloat val || isInt val then toString val
+    else if isBool val then toLuaBool val
+    else "";
+
+  toLuaList = val: "{ ${concatStringsSep ", " (map toLua val)} }";
+
+  toLuaStr = val: "'${val}'";
+
+  toLuaBool = val: if val then "true" else "false";
+in
+{
+  inherit toLua;
+}

lib.test.nix

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+{ pkgs ? import <nixpkgs> { } }:
+
+let
+  nix2lua = import ./lib.nix;
+  inherit (nix2lua) toLua;
+in
+pkgs.lib.runTests {
+  "test returns an empty string" = {
+    expr = toLua null;
+    expected = "";
+  };
+  "test returns a lua string" = {
+    expr = toLua "hello world";
+    expected = "'hello world'";
+  };
+  "test returns an integer number" = {
+    expr = toLua 10;
+    expected = "10";
+  };
+  "test returns a float number" = {
+    expr = toLua 10.1;
+    expected = "10.100000";
+  };
+  "test returns true" = {
+    expr = toLua true;
+    expected = "true";
+  };
+  "test returns false" = {
+    expr = toLua false;
+    expected = "false";
+  };
+  "test returns array with all primitive types" = {
+    expr = toLua [ "hello" 10 10.1 true ];
+    expected = "{ 'hello', 10, 10.100000, true }";
+  };
+}