nix-community.nixvim/lib/to-lua.nix

{ lib }:
with lib;
rec {
  # Black functional magic that converts a bunch of different Nix types to their
  # lua equivalents!
  toLuaObject =
    args:
    if builtins.isAttrs args then
      if hasAttr "__raw" args then
        args.__raw
      else if hasAttr "__empty" args then
        "{ }"
      else
        "{"
        + (concatStringsSep "," (
          mapAttrsToList (
            n: v:
            let
              valueString = toLuaObject v;
            in
            if hasPrefix "__unkeyed" n then
              valueString
            else if hasPrefix "__rawKey__" n then
              ''[${removePrefix "__rawKey__" n}] = '' + valueString
            else if n == "__emptyString" then
              "[''] = " + valueString
            else
              "[${toLuaObject n}] = " + valueString
          ) (filterAttrs (n: v: v != null && (toLuaObject v != "{}")) args)
        ))
        + "}"
    else if builtins.isList args then
      "{" + concatMapStringsSep "," toLuaObject args + "}"
    else if builtins.isString args then
      # This should be enough!
      builtins.toJSON args
    else if builtins.isPath args then
      builtins.toJSON (toString args)
    else if builtins.isBool args then
      "${boolToString args}"
    else if builtins.isFloat args then
      "${toString args}"
    else if builtins.isInt args then
      "${toString args}"
    else if (args == null) then
      "nil"
    else
      "";
}