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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
- 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 register():
- signals.content_object_init.connect(insert_read_more_link)
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