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# -*- coding: utf-8 -*-
# Copyright © 2012-2014 Roberto Alsina and others.
# 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.
from __future__ import unicode_literals
import codecs
import glob
import os
import sys
import subprocess
from nikola.plugin_categories import Task
from nikola import utils
class BuildSass(Task):
"""Generate CSS out of Sass sources."""
name = "build_sass"
sources_folder = "sass"
sources_ext = (".sass", ".scss")
def gen_tasks(self):
"""Generate CSS out of Sass sources."""
self.logger = utils.get_logger('build_sass', self.site.loghandlers)
self.compiler_name = self.site.config['SASS_COMPILER']
kw = {
'cache_folder': self.site.config['CACHE_FOLDER'],
'themes': self.site.THEMES,
}
# Find where in the theme chain we define the Sass targets
# There can be many *.sass/*.scss in the folder, but we only
# will build the ones listed in sass/targets
targets_path = utils.get_asset_path(os.path.join(self.sources_folder, "targets"), self.site.THEMES)
try:
with codecs.open(targets_path, "rb", "utf-8") as inf:
targets = [x.strip() for x in inf.readlines()]
except Exception:
targets = []
for theme_name in kw['themes']:
src = os.path.join(utils.get_theme_path(theme_name), self.sources_folder)
for task in utils.copy_tree(src, os.path.join(kw['cache_folder'], self.sources_folder)):
task['basename'] = 'prepare_sass_sources'
yield task
# Build targets and write CSS files
base_path = utils.get_theme_path(self.site.THEMES[0])
dst_dir = os.path.join(self.site.config['OUTPUT_FOLDER'], 'assets', 'css')
# Make everything depend on all sources, rough but enough
deps = glob.glob(os.path.join(
base_path,
self.sources_folder,
*("*{0}".format(ext) for ext in self.sources_ext)))
def compile_target(target, dst):
utils.makedirs(dst_dir)
run_in_shell = sys.platform == 'win32'
src = os.path.join(kw['cache_folder'], self.sources_folder, target)
try:
compiled = subprocess.check_output([self.compiler_name, src], shell=run_in_shell)
except OSError:
utils.req_missing([self.compiler_name],
'build Sass files (and use this theme)',
False, False)
with open(dst, "wb+") as outf:
outf.write(compiled)
yield self.group_task()
# We can have file conflicts. This is a way to prevent them.
# I orignally wanted to use sets and their cannot-have-duplicates
# magic, but I decided not to do this so we can show the user
# what files were problematic.
# If we didn’t do this, there would be a cryptic message from doit
# instead.
seennames = {}
for target in targets:
base = os.path.splitext(target)[0]
dst = os.path.join(dst_dir, base + ".css")
if base in seennames:
self.logger.error(
'Duplicate filenames for Sass compiled files: {0} and '
'{1} (both compile to {2})'.format(
seennames[base], target, base + ".css"))
else:
seennames.update({base: target})
yield {
'basename': self.name,
'name': dst,
'targets': [dst],
'file_dep': deps,
'task_dep': ['prepare_sass_sources'],
'actions': ((compile_target, [target, dst]), ),
'uptodate': [utils.config_changed(kw)],
'clean': True
}
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