def query_mode(term: Terminal, ui: UI) -> Iterator[str]:
r"""Display query mode title.
>>> from pgactivity.types import QueryMode, UI
>>> term = Terminal()
>>> ui = UI.make(query_mode=QueryMode.blocking)
>>> query_mode(term, ui)
BLOCKING QUERIES
>>> ui = UI.make(query_mode=QueryMode.activities, in_pause=True)
>>> query_mode(term, ui) # doctest: +NORMALIZE_WHITESPACE
PAUSE
"""
if ui.in_pause:
yield term.black_on_yellow(term.center("PAUSE", fillchar=" "))
else:
yield term.green_bold(
term.center(ui.query_mode.value.upper(), fillchar=" ").rstrip())
