Issue 2440 - implement Source.get_cache_dir() to be used by custom filters/globals

cms/sources.py

 # coding: utf-8
 
 # This file is part of the Adblock Plus web scripts,
 # Copyright (C) 2006-2015 Eyeo GmbH
 #
 # Adblock Plus is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License version 3 as
 # published by the Free Software Foundation.
 #
 # Adblock Plus is distributed in the hope that it will be useful,
@@ skipping 193 matching lines @@
 class MercurialSource(Source):
   def __init__(self, repo):
     command = ["hg", "-R", repo, "archive", "-r", "default",
         "-t", "uzip", "-p", ".", "-"]
     data = subprocess.check_output(command)
     self._archive = zipfile.ZipFile(StringIO(data), mode="r")
 
     command = ["hg", "-R", repo, "id", "-n", "-r", "default"]
     self.version = subprocess.check_output(command).strip()
 
+    self._origin = urlparse.urlsplit(repo).path.strip('/')
+
   def __enter__(self):
     return self
 
   def __exit__(self, type, value, traceback):
     self.close()
     return False
 
   def close(self):
     self._archive.close()
 
   def has_file(self, filename):
     try:
       self._archive.getinfo("./%s" % filename)
     except KeyError:
       return False
     return True
 
   def read_file(self, filename, binary=False):
     result = self._archive.read("./%s" % filename)
     if not binary:
       result = result.decode("utf-8")
     return result
 
   def list_files(self, subdir):
     prefix = "./%s/" % subdir
     for filename in self._archive.namelist():
       if filename.startswith(prefix):
         yield filename[len(prefix):]
 
+  if os.name == "posix":
+    def get_cache_dir(self):
+      return "/var/cache/" + self._origin
+
 class FileSource(Source):
   def __init__(self, dir):
     self._dir = dir
 
   def __enter__(self):
     return self
 
   def __exit__(self, type, value, traceback):
     return False
 
@@ skipping 20 matching lines @@
         return
 
       for filename in files:
         path = os.path.join(dir, filename)
         if os.path.isfile(path):
           result.append(relpath + filename)
         elif os.path.isdir(path):
           do_list(path, relpath + filename + "/")
     do_list(self.get_path(subdir), "")
     return result
+
+  def get_cache_dir(self):
+    return os.path.join(self._dir, "cache")