Generate excerpts for Lektor

lektor_excerpt.py

from html.parser import HTMLParser

from lektor.pluginsystem import Plugin


class HTMLTagStripper(HTMLParser):

    def __init__(self):
        self.reset()
        self.strict = False
        self.convert_charrefs = True
        self.fed = []

    def handle_data(self, d):
        self.fed.append(d)

    def get_data(self):
        return ''.join(self.fed)


def strip_tags(html):

    s = HTMLTagStripper()
    s.feed(html)
    return s.get_data()


def get_excerpt(md, length=256):

    html = md.html
    plain = strip_tags(html)
    excerpt = plain[:length]

    return excerpt


class ExcerptPlugin(Plugin):
    name = 'excerpt'
    description = 'Generate excerpts for blog posts'

    def on_setup_env(self, **kwargs):
        self.env.jinja_env.filters['excerpt'] = get_excerpt