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# -*- coding: utf-8 -*-
"""
Asset management plugin for Pelican
===================================
This plugin allows you to use the `webassets`_ module to manage assets such as
CSS and JS files.
The ASSET_URL is set to a relative url to honor Pelican's RELATIVE_URLS
setting. This requires the use of SITEURL in the templates::
<link rel="stylesheet" href="{{ SITEURL }}/{{ ASSET_URL }}">
.. _webassets: https://webassets.readthedocs.org/
"""
from __future__ import unicode_literals
import os
import logging
from pelican import signals
logger = logging.getLogger(__name__)
try:
import webassets
from webassets import Environment
from webassets.ext.jinja2 import AssetsExtension
except ImportError:
webassets = None
def add_jinja2_ext(pelican):
"""Add Webassets to Jinja2 extensions in Pelican settings."""
pelican.settings['JINJA_EXTENSIONS'].append(AssetsExtension)
def create_assets_env(generator):
"""Define the assets environment and pass it to the generator."""
theme_static_dir = generator.settings['THEME_STATIC_DIR']
assets_destination = os.path.join(generator.output_path, theme_static_dir)
generator.env.assets_environment = Environment(
assets_destination, theme_static_dir)
if 'ASSET_CONFIG' in generator.settings:
for item in generator.settings['ASSET_CONFIG']:
generator.env.assets_environment.config[item[0]] = item[1]
if 'ASSET_BUNDLES' in generator.settings:
for name, args, kwargs in generator.settings['ASSET_BUNDLES']:
generator.env.assets_environment.register(name, *args, **kwargs)
if 'ASSET_DEBUG' in generator.settings:
generator.env.assets_environment.debug = generator.settings['ASSET_DEBUG']
elif logging.getLevelName(logger.getEffectiveLevel()) == "DEBUG":
generator.env.assets_environment.debug = True
for path in (generator.settings['THEME_STATIC_PATHS'] +
generator.settings.get('ASSET_SOURCE_PATHS', [])):
full_path = os.path.join(generator.theme, path)
generator.env.assets_environment.append_path(full_path)
def register():
"""Plugin registration."""
if webassets:
signals.initialized.connect(add_jinja2_ext)
signals.generator_init.connect(create_assets_env)
else:
logger.warning('`assets` failed to load dependency `webassets`.'
'`assets` plugin not loaded.')
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