def make_preamble(dolidoc, issue, date):
assert isinstance(dolidoc, Document)
assert isinstance(issue, int)
assert isinstance(date, datetime.datetime)
# packages
dolidoc.packages.pop() # to remove stupid package lastpage added by pylatex
# preamble itself
dolidoc.preamble.append(Command("currentissue", issue)) # substitute correct values
dolidoc.preamble.append(Command("currentyear", date.year))
dolidoc.preamble.append(Command("currentmonth", date.month))
dolidoc.preamble.append(Command("currentday", date.day))
dolidoc.preamble.append(Command("titleformat", options='block', arguments=Command("section"), extra_arguments=Arguments(NoEscape(r"\large\bfseries\filcenter"), Command("thesection"), Command("1em"), Command("MakeUppercase"))))
dolidoc.preamble.append(Command('title', 'Diário Oficial (preview)'))
return dolidoc
