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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'],
'theme_bundles': get_theme_bundles(self.site.THEMES),
}
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('cache', '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 = [os.path.join('output', dname, fname)
for fname in files]
task = {
'file_dep': file_dep,
'basename': self.name,
'name': 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_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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