WikiCalendarMacros uses undefined function format_datetime if babel library is not importable

[nick.piper@…]

There is some fallback code in source:wikicalendarmacro/trunk/wikicalendar/macros.py@13798​

has_babel = True
try:
    from babel import Locale, UnknownLocaleError
    from babel.core import LOCALE_ALIASES
    from babel.dates import format_datetime, get_day_names
except ImportError:
    has_babel = False
    def get_day_names(*args):
        """Cheap replacement for the identically named Babel function."""
        names = dict()
        for day in range(0, 7):
            dt = datetime(2001, 1, day + 1)
            names[day] = dt.strftime('%a')[:2]
        return names

but this is incomplete, as no alternative for format_datetime() is provided, and format_datetime() is called in the implementation.

I'll attach a patch which shows how we resolved this for our own project.

[nick.piper@…]

Candidate patch for #12133, against revision 13798

[Steffen Hoffmann]

In 14364:

WikiCalendarMacro: Add missing import-fallback for format_datetime, refs #12133.

This issue on Trac installations without Babel as well as the patch have been
kindly contributed by Nick Piper, thank you.