{ pkgs, ... }:

let
  addressbook = "$HOME/.abook/addressbook";
  contacts = "$HOME/Contacts";
in
pkgs.writeShellApplication {
  name = "dav-sync";
  runtimeInputs = [ "vdirsyncer" "coreutils" "abook" ];
  text = ''
    vdirsyncer discover && \
        vdirsyncer sync && \
        mkdir -p "$(dirname "${addressbook}")" && \
        cat "${contacts}"/*/*/* | \
            abook \
                --convert \
                --informat vcard \
                --outformat abook > \
            "${addressbook}"
  '';
}