{ config, pkgs, contacts, addressbook, ... }:

let
  shell = "${pkgs.dash}/bin/dash";
  vdirsyncer = "${pkgs.vdirsyncer}/bin/vdirsyncer";
  mkdir = "${pkgs.coreutils}/bin/mkdir";
  cat = "${pkgs.coreutils}/bin/cat";
  abook = "${pkgs.abook}/bin/abook";
  dirname = "${pkgs.coreutils}/bin/dirname";
in
  pkgs.writeScriptBin "davsync" ''
    #!${shell}
    ${vdirsyncer} discover && \
        ${vdirsyncer} sync && \
        ${mkdir} -p "$(${dirname} ${addressbook})" && \
        ${cat} "${contacts}"/*/*/* | \
            ${abook} \
                --convert \
                --informat vcard \
                --outformat abook > \
            "${config.home.homeDirectory}/.abook/adressbook"
  ''