Added an helper to convert any value into a tag value

""" Some helpers for the TQL database.

"""

import time

from datetime import datetime, timedelta

def taggify(value):

    """ Transform any value into a tag value.

    """

    if isinstance(value, bool):

        value = 'yes' if value else 'no'

    elif isinstance(value, datetime):

        value = str(int(time.mktime(value.timetuple())))

    elif isinstance(value, timedelta):

        value = str(value.seconds + value.days * 86400)

    elif isinstance(value, (set, list, tuple)):

        value = ' '.join((str(x) for x in value))

    elif isinstance(value, dict):

        value = ' '.join((':'.join((str(k), str(v))) for k, v in value.iteritems()))

    elif value is None:

        pass

    else:

        value = str(value)

    return value

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