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import os
import json
import logging
import subprocess
from django.conf import settings
from django.core.exceptions import ImproperlyConfigured
from django.core.files.base import ContentFile
from django.template import Context
from django.utils.encoding import force_bytes
from sass_processor.utils import get_custom_functions
from .storage import SassFileStorage, find_file
from .apps import APPS_INCLUDE_DIRS
try:
import sass
except ImportError:
sass = None
logger = logging.getLogger('sass-processor')
class SassProcessor:
source_storage = SassFileStorage()
include_paths = [str(ip) for ip in getattr(settings, 'SASS_PROCESSOR_INCLUDE_DIRS', [])]
try:
sass_precision = int(settings.SASS_PRECISION)
except (AttributeError, TypeError, ValueError):
sass_precision = None
sass_output_style = getattr(
settings,
'SASS_OUTPUT_STYLE',
'nested' if settings.DEBUG else 'compressed')
processor_enabled = getattr(settings, 'SASS_PROCESSOR_ENABLED', settings.DEBUG)
fail_silently = getattr(settings, 'SASS_PROCESSOR_FAIL_SILENTLY', not settings.DEBUG)
sass_extensions = ('.scss', '.sass')
node_npx_path = getattr(settings, 'NODE_NPX_PATH', 'npx')
def __init__(self, path=None):
self._path = path
nmd = [d[1] for d in getattr(settings, 'STATICFILES_DIRS', [])
if isinstance(d, (list, tuple)) and d[0] == 'node_modules']
self.node_modules_dir = str(nmd[0]) if len(nmd) else None
def __call__(self, path):
basename, ext = os.path.splitext(path)
filename = find_file(path)
if filename is None:
raise FileNotFoundError("Unable to locate file {path}".format(path=path))
if ext not in self.sass_extensions:
# return the given path, since it ends neither in `.scss` nor in `.sass`
return path
# compare timestamp of sourcemap file with all its dependencies, and check if we must recompile
css_filename = basename + '.css'
if not self.processor_enabled:
return css_filename
sourcemap_filename = css_filename + '.map'
base = os.path.dirname(filename)
if self.source_storage.exists(css_filename) and self.is_latest(sourcemap_filename, base):
return css_filename
# with offline compilation, raise an error, if css file could not be found.
if sass is None:
msg = "Offline compiled file `{}` is missing and libsass has not been installed."
raise ImproperlyConfigured(msg.format(css_filename))
# otherwise compile the SASS/SCSS file into .css and store it
filename_map = filename.replace(ext, '.css.map')
compile_kwargs = {
'filename': filename,
'source_map_filename': filename_map,
'include_paths': self.include_paths + APPS_INCLUDE_DIRS,
'custom_functions': get_custom_functions(),
}
if self.sass_precision:
compile_kwargs['precision'] = self.sass_precision
if self.sass_output_style:
compile_kwargs['output_style'] = self.sass_output_style
try:
content, sourcemap = (force_bytes(output) for output in sass.compile(**compile_kwargs))
except sass.CompileError as exc:
if self.fail_silently:
content, sourcemap = force_bytes(exc), None
logger.error(exc)
else:
raise exc
# autoprefix CSS files using postcss in external JavaScript process
if self.node_npx_path and os.path.isdir(self.node_modules_dir or ''):
os.environ['NODE_PATH'] = self.node_modules_dir
try:
options = [self.node_npx_path, 'postcss', '--use', 'autoprefixer']
if not settings.DEBUG:
options.append('--no-map')
proc = subprocess.Popen(options, stdin=subprocess.PIPE, stdout=subprocess.PIPE)
proc.stdin.write(content)
proc.stdin.close()
autoprefixed_content = proc.stdout.read()
proc.wait()
except (FileNotFoundError, BrokenPipeError) as exc:
logger.warning("Unable to postcss {}. Reason: {}".format(filename, exc))
else:
if len(autoprefixed_content) >= len(content):
content = autoprefixed_content
if self.source_storage.exists(css_filename):
self.source_storage.delete(css_filename)
self.source_storage.save(css_filename, ContentFile(content))
if self.source_storage.exists(sourcemap_filename):
self.source_storage.delete(sourcemap_filename)
if sourcemap:
self.source_storage.save(sourcemap_filename, ContentFile(sourcemap))
return css_filename
def resolve_path(self, context=None):
if context is None:
context = Context()
return self._path.resolve(context)
def is_sass(self):
_, ext = os.path.splitext(self.resolve_path())
return ext in self.sass_extensions
def is_latest(self, sourcemap_file, base):
if not self.source_storage.exists(sourcemap_file):
return False
sourcemap_mtime = self.source_storage.get_modified_time(sourcemap_file).timestamp()
with self.source_storage.open(sourcemap_file, 'r') as fp:
sourcemap = json.load(fp)
for srcfilename in sourcemap.get('sources'):
srcfilename = os.path.join(base, srcfilename)
if not os.path.isfile(srcfilename) or os.stat(srcfilename).st_mtime > sourcemap_mtime:
# at least one of the source is younger that the sourcemap referring it
return False
return True
@classmethod
def handle_simple(cls, path):
return cls.source_storage.url(path)
_sass_processor = SassProcessor()
def sass_processor(filename):
path = _sass_processor(filename)
return SassProcessor.handle_simple(path)
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