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