def define_env(env):
    """
    This is the hook function for the variables, macros and filters.
    """

    @env.macro
    def ScheduleTableHead():
        code = '''| <div style="width:110px">**Time**</div> | **Machine State** | **Description** | <div style="width:90px"> **Contact**</div> | 
        | :- | :- |:- |:- |'''
        return code
    
    @env.macro
    def ElogOP(nr):
        code = '[OP-Log {:}](https://elog-gfa.psi.ch/SLS/{:})'.format(nr, nr)
        return code
    
    @env.macro
    def ElogDEV(nr):
        code = '[Dev-Log {:}](https://elog-gfa.psi.ch/SLS+Development/{:})'.format(nr, nr)
        return code