From fb7a5b1cd220e7dc7356652c3de0f5cf7f2b111d Mon Sep 17 00:00:00 2001
From: Dmitriy Pleshevskiy <dmitriy@ideascup.me>
Date: Fri, 18 Nov 2022 02:36:55 +0300
Subject: [PATCH] initial commit

---
 .gitignore   |  3 +++
 flake.lock   | 43 +++++++++++++++++++++++++++++++++++++++++++
 flake.nix    | 23 +++++++++++++++++++++++
 lib.nix      | 19 +++++++++++++++++++
 lib.test.nix | 36 ++++++++++++++++++++++++++++++++++++
 5 files changed, 124 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 flake.lock
 create mode 100644 flake.nix
 create mode 100644 lib.nix
 create mode 100644 lib.test.nix

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..f26b10a
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,3 @@
+# direnv
+.envrc
+.direnv
diff --git a/flake.lock b/flake.lock
new file mode 100644
index 0000000..2be96df
--- /dev/null
+++ b/flake.lock
@@ -0,0 +1,43 @@
+{
+  "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
+}
diff --git a/flake.nix b/flake.nix
new file mode 100644
index 0000000..1b37178
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,23 @@
+{
+  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;
+        };
+
+      });
+}
diff --git a/lib.nix b/lib.nix
new file mode 100644
index 0000000..9058db1
--- /dev/null
+++ b/lib.nix
@@ -0,0 +1,19 @@
+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;
+}
diff --git a/lib.test.nix b/lib.test.nix
new file mode 100644
index 0000000..28d31eb
--- /dev/null
+++ b/lib.test.nix
@@ -0,0 +1,36 @@
+{ 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 }";
+  };
+}