{ lib, stdenv, fetchurl, pkg-config, perl
, openssl, db, cyrus_sasl, zlib
, Security
# Disabled by default as XOAUTH2 is an "OBSOLETE" SASL mechanism and this relies
# on a package that isn't really maintained anymore:
, withCyrusSaslXoauth2 ? false, cyrus-sasl-xoauth2, makeWrapper
}:

stdenv.mkDerivation (finalAttrs: {
  pname = "isync";
  version = "1.5.0";

  src = fetchurl {
    url = "mirror://sourceforge/isync/isync-${finalAttrs.version}.tar.gz";
    hash = "sha256-oMgeEJOHvyedoWFFMQM5nneUav7PXFH5QTxedzVX940=";
  };

  # Fixes "Fatal: buffer too small" error
  # see https://sourceforge.net/p/isync/mailman/isync-devel/thread/87fsevvebj.fsf%40steelpick.2x.cz/
  env.NIX_CFLAGS_COMPILE = "-DQPRINTF_BUFF=4000";

  nativeBuildInputs = [ pkg-config perl ]
    ++ lib.optionals withCyrusSaslXoauth2 [ makeWrapper ];
  buildInputs = [ openssl db cyrus_sasl zlib ]
    ++ lib.optionals stdenv.hostPlatform.isDarwin [ Security ];

  postInstall = lib.optionalString withCyrusSaslXoauth2 ''
    wrapProgram "$out/bin/mbsync" \
        --prefix SASL_PATH : "${lib.makeSearchPath "lib/sasl2" [ cyrus-sasl-xoauth2 cyrus_sasl.out ]}"
  '';

  meta = with lib; {
    homepage = "http://isync.sourceforge.net/";
    # https://sourceforge.net/projects/isync/
    changelog = "https://sourceforge.net/p/isync/isync/ci/v${version}/tree/NEWS";
    description = "Free IMAP and MailDir mailbox synchronizer";
    longDescription = ''
      mbsync (formerly isync) is a command line application which synchronizes
      mailboxes. Currently Maildir and IMAP4 mailboxes are supported. New
      messages, message deletions and flag changes can be propagated both ways.
    '';
    license = licenses.gpl2Plus;
    platforms = platforms.unix;
    maintainers = with maintainers; [ primeos ];
    mainProgram = "mbsync";
  };
})