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# -*- coding: utf-8 -*-
"""
Read More Link
===========================
This plugin inserts an inline "read more" or "continue" link into the last html element of the object summary.
For more information, please visit: http://vuongnguyen.com/creating-inline-read-more-link-python-pelican-lxml.html
"""
from pelican import signals, contents
from pelican.utils import truncate_html_words
from pelican.generators import ArticlesGenerator
try:
from lxml.html import fragment_fromstring, fragments_fromstring, tostring
from lxml.etree import ParserError
except ImportError:
raise Exception("Unable to find lxml. To use READ_MORE_LINK, you need lxml")
def insert_into_last_element(html, element):
"""
function to insert an html element into another html fragment
example:
html = '<p>paragraph1</p><p>paragraph2...</p>'
element = '<a href="/read-more/">read more</a>'
---> '<p>paragraph1</p><p>paragraph2...<a href="/read-more/">read more</a></p>'
"""
try:
item = fragment_fromstring(element)
except (ParserError, TypeError) as e:
item = fragment_fromstring('<span></span>')
try:
doc = fragments_fromstring(html)
doc[-1].append(item)
return ''.join(tostring(e) for e in doc)
except (ParserError, TypeError) as e:
return ''
def insert_read_more_link(instance):
"""
Insert an inline "read more" link into the last element of the summary
:param instance:
:return:
"""
# only deals with Article type
if type(instance) != contents.Article: return
SUMMARY_MAX_LENGTH = instance.settings.get('SUMMARY_MAX_LENGTH')
READ_MORE_LINK = instance.settings.get('READ_MORE_LINK', None)
READ_MORE_LINK_FORMAT = instance.settings.get('READ_MORE_LINK_FORMAT',
'<a class="read-more" href="/{url}">{text}</a>')
if not (SUMMARY_MAX_LENGTH and READ_MORE_LINK and READ_MORE_LINK_FORMAT): return
if hasattr(instance, '_summary') and instance._summary:
summary = instance._summary
else:
summary = truncate_html_words(instance.content, SUMMARY_MAX_LENGTH)
if summary != instance.content:
read_more_link = READ_MORE_LINK_FORMAT.format(url=instance.url, text=READ_MORE_LINK)
instance._summary = insert_into_last_element(summary, read_more_link)
def run_plugin(generators):
for generator in generators:
if isinstance(generator, ArticlesGenerator):
for article in generator.articles:
insert_read_more_link(article)
def register():
try:
signals.all_generators_finalized.connect(run_plugin)
except AttributeError:
# NOTE: This may result in #314 so shouldn't really be relied on
# https://github.com/getpelican/pelican-plugins/issues/314
signals.content_object_init.connect(insert_read_more_link)