more robust: fall-back for SyntaxUtilities.StyleExtender when Isabelle plugin is unloaded;
#!/usr/bin/env bash
#
# DESCRIPTION: start the main Isabelle cronjob
THIS="$(cd "$(dirname "$0")"; pwd)"
source "$HOME/.bashrc"
export ISABELLE_IDENTIFIER="cronjob"
"$THIS/../build" jars_fresh || exit $?
exec "$THIS/../../bin/isabelle_java" isabelle.Isabelle_Cronjob "$@"