def popover_ellipsis(source, length=0):
''' return the plain text representation of markdown encoded text. That
is the texted without any html tags. If ``length`` is 0 then it
will not be truncated.'''
try:
length = int(length)
except ValueError: # invalid literal for int()
return source # Fail silently.
ellipsis = ('<a href rel="popover" data-content="{0}" '
'data-trigger="hover" data-container="body">...</a>').format(escape(source))
truncated = Truncator(strip_tags(source)).chars(length)
nb_words = len(truncated.split(' '))
html_truncated = Truncator(source).words(nb_words, html=True, truncate='{...}')
return mark_safe(html_truncated.replace('{...}', ellipsis))
