def auto_widget(field):
    '''Return a list of widget names for the provided field.'''
    # Auto-detect
    info = {
        'widget': field.field.widget.__class__.__name__,
        'field': field.field.__class__.__name__,
        'name': field.name,
    }

    return [
        fmt.format(**info)
        for fmt in (
            '{field}_{widget}_{name}',
            '{field}_{name}',
            '{widget}_{name}',
            '{field}_{widget}',
            '{name}',
            '{widget}',
            '{field}',
        )
    ]
Return a list of widget names for the provided field.