add libs to flake

1 files changed, 32 insertions, 0 deletions

diff --git a/lib/lua.nix b/lib/lua.nix
new file mode 100644
index 0000000..704cdfa
--- /dev/null
+++ b/lib/lua.nix
@@ -0,0 +1,32 @@
+{lib, ...}: let
+  fmt = val:
+  # nil
+    if val == null
+    then "nil"
+    # boolean
+    else if builtins.isBool val
+    then
+      if val
+      then "true"
+      else "false"
+    # number
+    else if builtins.isInt val || builtins.isFloat val
+    then toString val
+    # string
+    else if builtins.isString val
+    then "'${val}'"
+    # table (array)
+    else if builtins.isList val
+    then "{ " + (lib.concatStringsSep ", " (map fmt val)) + " }"
+    # table (object)
+    else if builtins.isAttrs val
+    then
+      "{ "
+      + (lib.concatStringsSep ", "
+        (lib.mapAttrsToList (k: v: "${k} = ${fmt v}") val))
+      + " }"
+    # invalid
+    else throw "Unsupported value: ${toString val}";
+in {
+  fmt = fmt;
+}