with import <nixpkgs> {};

with pkgs.lib;

{
  generateKConf = exprs: let
    isNumber = c: elem c ["0" "1" "2" "3" "4" "5" "6" "7" "8" "9"];
    mkValue = val:
      if val == "" then "\"\""
      else if val == "y" || val == "m" || val == "n" then val
      else if all isNumber (stringToCharacters val) then val
      else if substring 0 2 val == "0x" then val
      else "\"${val}\"";
    mkConfigLine = key: val: "${key}=${mkValue val}";
    mkConf = cfg: concatStringsSep "\n" (mapAttrsToList mkConfigLine cfg);
  in pkgs.writeText "generated.kconf" (mkConf exprs);
}