463 lines
17 KiB
Python
463 lines
17 KiB
Python
"""i18n_subsites plugin creates i18n-ized subsites of the default site
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This plugin is designed for Pelican 3.4 and later
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"""
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import os
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import six
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import logging
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import posixpath
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from copy import copy
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from itertools import chain
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from operator import attrgetter
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try:
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from collections.abc import OrderedDict
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except ImportError:
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from collections import OrderedDict
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from contextlib import contextmanager
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from six.moves.urllib.parse import urlparse
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import gettext
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import locale
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from pelican import signals
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from pelican.generators import ArticlesGenerator, PagesGenerator
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from pelican.settings import configure_settings
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try:
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from pelican.contents import Draft
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except ImportError:
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from pelican.contents import Article as Draft
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# Global vars
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_MAIN_SETTINGS = None # settings dict of the main Pelican instance
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_MAIN_LANG = None # lang of the main Pelican instance
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_MAIN_SITEURL = None # siteurl of the main Pelican instance
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_MAIN_STATIC_FILES = None # list of Static instances the main Pelican instance
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_SUBSITE_QUEUE = {} # map: lang -> settings overrides
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_SITE_DB = OrderedDict() # OrderedDict: lang -> siteurl
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_SITES_RELPATH_DB = {} # map: (lang, base_lang) -> relpath
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# map: generator -> list of removed contents that need interlinking
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_GENERATOR_DB = {}
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_NATIVE_CONTENT_URL_DB = {} # map: source_path -> content in its native lang
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_LOGGER = logging.getLogger(__name__)
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@contextmanager
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def temporary_locale(temp_locale=None):
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'''Enable code to run in a context with a temporary locale
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Resets the locale back when exiting context.
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Can set a temporary locale if provided
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'''
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orig_locale = locale.setlocale(locale.LC_ALL)
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if temp_locale is not None:
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locale.setlocale(locale.LC_ALL, temp_locale)
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yield
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locale.setlocale(locale.LC_ALL, orig_locale)
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def initialize_dbs(settings):
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'''Initialize internal DBs using the Pelican settings dict
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This clears the DBs for e.g. autoreload mode to work
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'''
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global _MAIN_SETTINGS, _MAIN_SITEURL, _MAIN_LANG, _SUBSITE_QUEUE
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_MAIN_SETTINGS = settings
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_MAIN_LANG = settings['DEFAULT_LANG']
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_MAIN_SITEURL = settings['SITEURL']
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_SUBSITE_QUEUE = settings.get('I18N_SUBSITES', {}).copy()
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prepare_site_db_and_overrides()
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# clear databases in case of autoreload mode
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_SITES_RELPATH_DB.clear()
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_NATIVE_CONTENT_URL_DB.clear()
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_GENERATOR_DB.clear()
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def prepare_site_db_and_overrides():
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'''Prepare overrides and create _SITE_DB
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_SITE_DB.keys() need to be ready for filter_translations
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'''
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_SITE_DB.clear()
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_SITE_DB[_MAIN_LANG] = _MAIN_SITEURL
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# make sure it works for both root-relative and absolute
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main_siteurl = '/' if _MAIN_SITEURL == '' else _MAIN_SITEURL
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for lang, overrides in _SUBSITE_QUEUE.items():
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if 'SITEURL' not in overrides:
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overrides['SITEURL'] = posixpath.join(main_siteurl, lang)
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_SITE_DB[lang] = overrides['SITEURL']
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# default subsite hierarchy
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if 'OUTPUT_PATH' not in overrides:
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overrides['OUTPUT_PATH'] = os.path.join(
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_MAIN_SETTINGS['OUTPUT_PATH'], lang)
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if 'CACHE_PATH' not in overrides:
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overrides['CACHE_PATH'] = os.path.join(
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_MAIN_SETTINGS['CACHE_PATH'], lang)
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if 'STATIC_PATHS' not in overrides:
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overrides['STATIC_PATHS'] = []
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if ('THEME' not in overrides and 'THEME_STATIC_DIR' not in overrides and
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'THEME_STATIC_PATHS' not in overrides):
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relpath = relpath_to_site(lang, _MAIN_LANG)
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overrides['THEME_STATIC_DIR'] = posixpath.join(
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relpath, _MAIN_SETTINGS['THEME_STATIC_DIR'])
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overrides['THEME_STATIC_PATHS'] = []
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# to change what is perceived as translations
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overrides['DEFAULT_LANG'] = lang
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def subscribe_filter_to_signals(settings):
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'''Subscribe content filter to requested signals'''
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for sig in settings.get('I18N_FILTER_SIGNALS', []):
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sig.connect(filter_contents_translations)
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def initialize_plugin(pelican_obj):
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'''Initialize plugin variables and Pelican settings'''
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if _MAIN_SETTINGS is None:
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initialize_dbs(pelican_obj.settings)
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subscribe_filter_to_signals(pelican_obj.settings)
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def get_site_path(url):
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'''Get the path component of an url, excludes siteurl
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also normalizes '' to '/' for relpath to work,
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otherwise it could be interpreted as a relative filesystem path
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'''
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path = urlparse(url).path
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if path == '':
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path = '/'
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return path
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def relpath_to_site(lang, target_lang):
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'''Get relative path from siteurl of lang to siteurl of base_lang
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the output is cached in _SITES_RELPATH_DB
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'''
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path = _SITES_RELPATH_DB.get((lang, target_lang), None)
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if path is None:
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siteurl = _SITE_DB.get(lang, _MAIN_SITEURL)
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target_siteurl = _SITE_DB.get(target_lang, _MAIN_SITEURL)
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path = posixpath.relpath(get_site_path(target_siteurl),
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get_site_path(siteurl))
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_SITES_RELPATH_DB[(lang, target_lang)] = path
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return path
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def save_generator(generator):
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'''Save the generator for later use
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initialize the removed content list
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'''
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_GENERATOR_DB[generator] = []
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def article2draft(article):
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'''Transform an Article to Draft'''
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draft = Draft(article._content, article.metadata, article.settings,
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article.source_path, article._context)
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draft.status = 'draft'
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return draft
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def page2hidden_page(page):
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'''Transform a Page to a hidden Page'''
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page.status = 'hidden'
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return page
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class GeneratorInspector(object):
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'''Inspector of generator instances'''
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generators_info = {
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ArticlesGenerator: {
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'translations_lists': ['translations', 'drafts_translations'],
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'contents_lists': [('articles', 'drafts')],
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'hiding_func': article2draft,
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'policy': 'I18N_UNTRANSLATED_ARTICLES',
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},
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PagesGenerator: {
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'translations_lists': ['translations', 'hidden_translations'],
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'contents_lists': [('pages', 'hidden_pages')],
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'hiding_func': page2hidden_page,
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'policy': 'I18N_UNTRANSLATED_PAGES',
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},
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}
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def __init__(self, generator):
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'''Identify the best known class of the generator instance
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The class '''
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self.generator = generator
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self.generators_info.update(generator.settings.get(
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'I18N_GENERATORS_INFO', {}))
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for cls in generator.__class__.__mro__:
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if cls in self.generators_info:
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self.info = self.generators_info[cls]
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break
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else:
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self.info = {}
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def translations_lists(self):
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'''Iterator over lists of content translations'''
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return (getattr(self.generator, name) for name in
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self.info.get('translations_lists', []))
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def contents_list_pairs(self):
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'''Iterator over pairs of normal and hidden contents'''
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return (tuple(getattr(self.generator, name) for name in names)
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for names in self.info.get('contents_lists', []))
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def hiding_function(self):
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'''Function for transforming content to a hidden version'''
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hiding_func = self.info.get('hiding_func', lambda x: x)
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return hiding_func
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def untranslated_policy(self, default):
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'''Get the policy for untranslated content'''
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return self.generator.settings.get(self.info.get('policy', None),
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default)
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def all_contents(self):
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'''Iterator over all contents'''
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translations_iterator = chain(*self.translations_lists())
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return chain(translations_iterator,
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*(pair[i] for pair in self.contents_list_pairs()
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for i in (0, 1)))
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def filter_contents_translations(generator):
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'''Filter the content and translations lists of a generator
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Filters out
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1) translations which will be generated in a different site
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2) content that is not in the language of the currently
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generated site but in that of a different site, content in a
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language which has no site is generated always. The filtering
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method bay be modified by the respective untranslated policy
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'''
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inspector = GeneratorInspector(generator)
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current_lang = generator.settings['DEFAULT_LANG']
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langs_with_sites = _SITE_DB.keys()
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removed_contents = _GENERATOR_DB[generator]
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for translations in inspector.translations_lists():
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for translation in translations[:]: # copy to be able to remove
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if translation.lang in langs_with_sites:
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translations.remove(translation)
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removed_contents.append(translation)
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hiding_func = inspector.hiding_function()
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untrans_policy = inspector.untranslated_policy(default='hide')
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for (contents, other_contents) in inspector.contents_list_pairs():
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for content in other_contents: # save any hidden native content first
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if content.lang == current_lang: # in native lang
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# save the native URL attr formatted in the current locale
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_NATIVE_CONTENT_URL_DB[content.source_path] = content.url
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for content in contents[:]: # copy for removing in loop
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if content.lang == current_lang: # in native lang
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# save the native URL attr formatted in the current locale
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_NATIVE_CONTENT_URL_DB[content.source_path] = content.url
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elif content.lang in langs_with_sites and untrans_policy != 'keep':
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contents.remove(content)
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if untrans_policy == 'hide':
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other_contents.append(hiding_func(content))
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elif untrans_policy == 'remove':
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removed_contents.append(content)
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def install_templates_translations(generator):
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'''Install gettext translations in the jinja2.Environment
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Only if the 'jinja2.ext.i18n' jinja2 extension is enabled
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the translations for the current DEFAULT_LANG are installed.
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'''
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if 'JINJA_ENVIRONMENT' in generator.settings: # pelican 3.7+
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jinja_extensions = generator.settings['JINJA_ENVIRONMENT'].get(
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'extensions', [])
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else:
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jinja_extensions = generator.settings['JINJA_EXTENSIONS']
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if 'jinja2.ext.i18n' in jinja_extensions:
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domain = generator.settings.get('I18N_GETTEXT_DOMAIN', 'messages')
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localedir = generator.settings.get('I18N_GETTEXT_LOCALEDIR')
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if localedir is None:
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localedir = os.path.join(generator.theme, 'translations')
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current_lang = generator.settings['DEFAULT_LANG']
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if current_lang == generator.settings.get('I18N_TEMPLATES_LANG',
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_MAIN_LANG):
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translations = gettext.NullTranslations()
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else:
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langs = [current_lang]
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try:
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translations = gettext.translation(domain, localedir, langs)
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except (IOError, OSError):
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_LOGGER.error((
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"Cannot find translations for language '{}' in '{}' with "
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"domain '{}'. Installing NullTranslations.").format(
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langs[0], localedir, domain))
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translations = gettext.NullTranslations()
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newstyle = generator.settings.get('I18N_GETTEXT_NEWSTYLE', True)
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generator.env.install_gettext_translations(translations, newstyle)
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def add_variables_to_context(generator):
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'''Adds useful iterable variables to template context'''
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context = generator.context # minimize attr lookup
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context['relpath_to_site'] = relpath_to_site
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context['main_siteurl'] = _MAIN_SITEURL
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context['main_lang'] = _MAIN_LANG
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context['lang_siteurls'] = _SITE_DB
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current_lang = generator.settings['DEFAULT_LANG']
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extra_siteurls = _SITE_DB.copy()
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extra_siteurls.pop(current_lang)
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context['extra_siteurls'] = extra_siteurls
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def interlink_translations(content):
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'''Link content to translations in their main language
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so the URL (including localized month names) of the different subsites
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will be honored
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'''
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lang = content.lang
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# sort translations by lang
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content.translations.sort(key=attrgetter('lang'))
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for translation in content.translations:
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relpath = relpath_to_site(lang, translation.lang)
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url = _NATIVE_CONTENT_URL_DB[translation.source_path]
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translation.override_url = posixpath.join(relpath, url)
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def interlink_translated_content(generator):
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'''Make translations link to the native locations
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for generators that may contain translated content
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'''
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inspector = GeneratorInspector(generator)
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for content in inspector.all_contents():
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interlink_translations(content)
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def interlink_removed_content(generator):
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'''For all contents removed from generation queue update interlinks
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link to the native location
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'''
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current_lang = generator.settings['DEFAULT_LANG']
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for content in _GENERATOR_DB[generator]:
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url = _NATIVE_CONTENT_URL_DB[content.source_path]
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relpath = relpath_to_site(current_lang, content.lang)
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content.override_url = posixpath.join(relpath, url)
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def interlink_static_files(generator):
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'''Add links to static files in the main site if necessary'''
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if generator.settings['STATIC_PATHS'] != []:
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return # customized STATIC_PATHS
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try: # minimize attr lookup
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static_content = generator.context['static_content']
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except KeyError:
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static_content = generator.context['filenames']
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relpath = relpath_to_site(generator.settings['DEFAULT_LANG'], _MAIN_LANG)
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for staticfile in _MAIN_STATIC_FILES:
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if staticfile.get_relative_source_path() not in static_content:
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staticfile = copy(staticfile) # prevent override in main site
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staticfile.override_url = posixpath.join(relpath, staticfile.url)
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try:
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generator.add_source_path(staticfile, static=True)
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except TypeError:
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generator.add_source_path(staticfile)
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def save_main_static_files(static_generator):
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'''Save the static files generated for the main site'''
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global _MAIN_STATIC_FILES
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# test just for current lang as settings change in autoreload mode
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if static_generator.settings['DEFAULT_LANG'] == _MAIN_LANG:
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_MAIN_STATIC_FILES = static_generator.staticfiles
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def update_generators():
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'''Update the context of all generators
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Ads useful variables and translations into the template context
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and interlink translations
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'''
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for generator in _GENERATOR_DB.keys():
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install_templates_translations(generator)
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add_variables_to_context(generator)
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interlink_static_files(generator)
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interlink_removed_content(generator)
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interlink_translated_content(generator)
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def get_pelican_cls(settings):
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'''Get the Pelican class requested in settings'''
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cls = settings['PELICAN_CLASS']
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if isinstance(cls, six.string_types):
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module, cls_name = cls.rsplit('.', 1)
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module = __import__(module)
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cls = getattr(module, cls_name)
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return cls
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def create_next_subsite(pelican_obj):
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'''Create the next subsite using the lang-specific config
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If there are no more subsites in the generation queue, update all
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the generators (interlink translations and removed content, add
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variables and translations to template context). Otherwise get the
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language and overrides for next the subsite in the queue and apply
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overrides. Then generate the subsite using a PELICAN_CLASS
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instance and its run method. Finally, restore the previous locale.
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'''
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global _MAIN_SETTINGS
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if len(_SUBSITE_QUEUE) == 0:
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_LOGGER.debug(
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'i18n: Updating cross-site links and context of all generators.')
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update_generators()
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_MAIN_SETTINGS = None # to initialize next time
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else:
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with temporary_locale():
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settings = _MAIN_SETTINGS.copy()
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lang, overrides = _SUBSITE_QUEUE.popitem()
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settings.update(overrides)
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settings = configure_settings(settings) # to set LOCALE, etc.
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cls = get_pelican_cls(settings)
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new_pelican_obj = cls(settings)
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_LOGGER.debug(("Generating i18n subsite for language '{}' "
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"using class {}").format(lang, cls))
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new_pelican_obj.run()
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# map: signal name -> function name
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_SIGNAL_HANDLERS_DB = {
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'get_generators': initialize_plugin,
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'article_generator_pretaxonomy': filter_contents_translations,
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'page_generator_finalized': filter_contents_translations,
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'get_writer': create_next_subsite,
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'static_generator_finalized': save_main_static_files,
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'generator_init': save_generator,
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}
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def register():
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'''Register the plugin only if required signals are available'''
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for sig_name in _SIGNAL_HANDLERS_DB.keys():
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if not hasattr(signals, sig_name):
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_LOGGER.error((
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'The i18n_subsites plugin requires the {} '
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'signal available for sure in Pelican 3.4.0 and later, '
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'plugin will not be used.').format(sig_name))
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return
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for sig_name, handler in _SIGNAL_HANDLERS_DB.items():
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sig = getattr(signals, sig_name)
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sig.connect(handler)
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