in pelican/plugins/asfgenid.py [0:0]
def headingid_transform(ids, soup, tag, permalinks, perma_set):
new_string = tag.string
if not new_string:
# roll up strings if no immediate string
new_string = tag.find_all(
text=lambda t: not isinstance(t, Comment),
recursive=True)
new_string = ''.join(new_string)
# don't have an id create it from text
new_id = slugify(new_string, '-')
tag['id'] = unique(new_id, ids)
if permalinks:
permalink(soup, tag)
# inform if there is a duplicate permalink
unique(tag['id'], perma_set)