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# -*- coding: utf-8 -*-
from io import BytesIO
import csv
import codecs
import importlib
from django.conf import settings
#
# Django compatibility
#
def load_tag_library(libname):
"""
Load a templatetag library on multiple Django versions.
Returns None if the library isn't loaded.
"""
from django.template.backends.django import get_installed_libraries
from django.template.library import InvalidTemplateLibrary
try:
lib = get_installed_libraries()[libname]
lib = importlib.import_module(lib).register
return lib
except (InvalidTemplateLibrary, KeyError):
return None
def get_template_setting(template_key, default=None):
"""Read template settings"""
templates_var = getattr(settings, "TEMPLATES", None)
if templates_var:
for tdict in templates_var:
if template_key in tdict:
return tdict[template_key]
return default
class UnicodeWriter:
"""
CSV writer which will write rows to CSV file "f",
which is encoded in the given encoding.
We are using this custom UnicodeWriter for python versions 2.x
"""
def __init__(self, f, dialect=csv.excel, encoding="utf-8", **kwds):
self.queue = BytesIO()
self.writer = csv.writer(self.queue, dialect=dialect, **kwds)
self.stream = f
self.encoder = codecs.getincrementalencoder(encoding)()
def writerow(self, row):
self.writer.writerow([s.encode("utf-8") for s in row])
# Fetch UTF-8 output from the queue ...
data = self.queue.getvalue()
data = data.decode("utf-8")
# ... and reencode it into the target encoding
data = self.encoder.encode(data)
# write to the target stream
self.stream.write(data)
# empty queue
self.queue.truncate(0)
def writerows(self, rows):
for row in rows:
self.writerow(row)
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