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# Copyright (c) 2012 Roberto Alsina y otros.
# Permission is hereby granted, free of charge, to any
# person obtaining a copy of this software and associated
# documentation files (the "Software"), to deal in the
# Software without restriction, including without limitation
# the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the
# Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice
# shall be included in all copies or substantial portions of
# the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
# KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
# WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
# PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS
# OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
# OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
# OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
# SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
import os
try:
import webassets
except ImportError:
webassets = None # NOQA
from nikola.plugin_categories import LateTask
from nikola import utils
class BuildBundles(LateTask):
"""Bundle assets using WebAssets."""
name = "build_bundles"
def set_site(self, site):
super(BuildBundles, self).set_site(site)
if webassets is None:
self.site.config['USE_BUNDLES'] = False
def gen_tasks(self):
"""Bundle assets using WebAssets."""
kw = {
'filters': self.site.config['FILTERS'],
'output_folder': self.site.config['OUTPUT_FOLDER'],
'cache_folder': self.site.config['CACHE_FOLDER'],
'theme_bundles': get_theme_bundles(self.site.THEMES),
'themes': self.site.THEMES,
'files_folders': self.site.config['FILES_FOLDERS'],
}
def build_bundle(output, inputs):
out_dir = os.path.join(kw['output_folder'],
os.path.dirname(output))
inputs = [i for i in inputs if os.path.isfile(
os.path.join(out_dir, i))]
cache_dir = os.path.join(kw['cache_folder'], 'webassets')
if not os.path.isdir(cache_dir):
os.makedirs(cache_dir)
env = webassets.Environment(out_dir, os.path.dirname(output),
cache=cache_dir)
bundle = webassets.Bundle(*inputs, output=os.path.basename(output))
env.register(output, bundle)
# This generates the file
env[output].urls()
flag = False
if (webassets is not None and self.site.config['USE_BUNDLES'] is not
False):
for name, files in kw['theme_bundles'].items():
output_path = os.path.join(kw['output_folder'], name)
dname = os.path.dirname(name)
file_dep = [get_asset_path(
os.path.join(dname, fname), kw['themes'], kw['files_folders'])
for fname in files
]
file_dep = filter(None, file_dep) # removes missing files
task = {
'file_dep': file_dep,
'basename': str(self.name),
'name': str(output_path),
'actions': [(build_bundle, (name, files))],
'targets': [output_path],
'uptodate': [utils.config_changed(kw)]
}
flag = True
yield utils.apply_filters(task, kw['filters'])
if flag is False: # No page rendered, yield a dummy task
yield {
'basename': self.name,
'uptodate': [True],
'name': 'None',
'actions': [],
}
def get_asset_path(path, themes, files_folders={'files': ''}):
"""Checks which theme provides the path with the given asset,
and returns the "real" path to the asset, relative to the
current directory.
If the asset is not provided by a theme, then it will be checked for
in the FILES_FOLDERS
>>> get_asset_path('assets/css/rst.css', ['site','default'])
'nikola/data/themes/default/assets/css/rst.css'
>>> get_asset_path('assets/css/theme.css', ['site','default'])
'nikola/data/themes/site/assets/css/theme.css'
>>> get_asset_path('nikola.py',['site','default'],{'nikola':''})
'nikola/nikola.py'
>>> get_asset_path('nikola/nikola.py',['site','default'],{'nikola':'nikola'})
'nikola/nikola.py'
"""
for theme_name in themes:
candidate = os.path.join(
utils.get_theme_path(theme_name),
path
)
if os.path.isfile(candidate):
return os.path.relpath(candidate, os.getcwd())
for src, rel_dst in files_folders.items():
candidate = os.path.join(
src,
os.path.relpath(path, rel_dst)
)
if os.path.isfile(candidate):
return os.path.relpath(candidate, os.getcwd())
# whatever!
return None
def get_theme_bundles(themes):
"""Given a theme chain, return the bundle definitions."""
bundles = {}
for theme_name in themes:
bundles_path = os.path.join(
utils.get_theme_path(theme_name), 'bundles')
if os.path.isfile(bundles_path):
with open(bundles_path) as fd:
for line in fd:
name, files = line.split('=')
files = [f.strip() for f in files.split(',')]
bundles[name.strip()] = files
break
return bundles
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