gistfile1.txt

===================================================================================================
originally i was passing languages as a list of 
===================================================================================================

de_DE_language = pkgs.stdenv.mkDerivation rec {
      version = "4.2";
      name = "wp_de_DE-${version}";
      src = pkgs.fetchurl {
        url = "https://downloads.wordpress.org/translation/core/${version}/${language}.zip";
        sha256 = "...2342342340fs9d02390fsfsf...";
      };
      buildInputs = [ pkgs.unzip ];
      unpackPhase = ''
        unzip $src
        export sourceRoot=.
      '';
      installPhase = "mkdir -p $out; cp -R * $out/";
    };

and this mkOption was passed to the service expression: 
  languages = [ de_DE_language ];

and during the installation for each given language-path i created symlinks:
  ${concatMapStrings (language: "ln -s ${language}/*.mo ${language}/*.po $out/wp-content/languages/\n") (languages) }

    languages = mkOption {
          default = [];
          type = types.listOf types.path;
     };


===================================================================================================
  now i want to generalize this pattern
===================================================================================================

 supportedLanguages = {
    en_GB = "1yf1sb6ji3l4lg8nkkjhckbwl81jly8z93jf06pvk6a1p6bsr6l6";
    de_DE = "3881221f337799b88f9562df8b3f1560f2c49a8f662297561a5b25ce77f22e17";
  };

  downloadLanguagePack = language: sha256:
    ${language}_language = pkgs.stdenv.mkDerivation rec {
      version = "4.2";
      name = "wp_${language}-${version}";
      src = pkgs.fetchurl {
        url = "https://downloads.wordpress.org/translation/core/${version}/${language}.zip";
        sha256 = "${sha256}";
      };
      buildInputs = [ pkgs.unzip ];
      unpackPhase = ''
        unzip $src
        export sourceRoot=.
      '';
      installPhase = "mkdir -p $out; cp -R * $out/";
    };

to in theory languages will be populated with procedurally generated attributes: 
  languages = map (lang: downloadLanguagePack ${lang} supportedLanguages.${lang}) (selectedLanguages);

and the config.language would then look something like this:
  languages = [ "de_DE" "en_EN" ];

however, this does not work because i don't know how to create the downloadLanguagePack function correctly. how to solve this?







later use it like this:

      # install language files
      mkdir -p $out/wp-content/languages
      ${concatMapStrings (language: "ln -s ${language}/*.mo ${language}/*.po $out/wp-content/languages/\n") (languages) }