Coding style.

- Let PagedList open func be specified outside.

eris/paged_list.py

@@ -3,7 +3,6 @@
 
 
 import functools
-import gzip
 import os
 import pickle
 import shutil
@@ -11,10 +10,12 @@ import shutil
 
 class PagedList:
 
-    def __init__(self, list_, pages_dir, page_size, cache_size, exist_ok=False):
+    def __init__(self, list_, pages_dir, page_size, cache_size, exist_ok=False,
+                 open_func=open):
         self.pages_dir = pages_dir  # An empty or non-existant directory.
         self.page_size = page_size
         self.cache_size = cache_size
+        self.open_func = open_func
         self._len = len(list_)
         tmp_dir = pages_dir + ".tmp"
         if exist_ok:
@@ -26,7 +27,7 @@ class PagedList:
                   for start in range(0, len(list_), self.page_size)))
         for index, page in enumerate(pages):
             pickle_path = os.path.join(tmp_dir, str(index))
-            with gzip.open(pickle_path, "wb") as file_:
+            with self.open_func(pickle_path, "wb") as file_:
                 pickle.dump(page, file_, protocol=pickle.HIGHEST_PROTOCOL)
         self.page_count = index + 1
         os.rename(tmp_dir, self.pages_dir)
@@ -37,7 +38,7 @@ class PagedList:
 
     def _get_page(self, index):  # This is cached, see setup_page_cache.
         pickle_path = os.path.join(self.pages_dir, str(index))
-        with gzip.open(pickle_path, "rb") as file_:
+        with self.open_func(pickle_path, "rb") as file_:
             return pickle.load(file_)
 
     def __getitem__(self, index):

eris/worker.py

@@ -4,6 +4,7 @@
 # Licensed under the Artistic License 2.0.
 
 import asyncio
+import gzip
 import os
 import shutil
 import signal
@@ -88,7 +89,7 @@ def make_result_widget(text, result):
     if len(appearance) > page_size:
         appearance = eris.paged_list.PagedList(
             appearance, result.get_pages_dir(), page_size, cache_size=2,
-            exist_ok=True)
+            exist_ok=True, open_func=gzip.open)
     return fill3.Fixed(appearance)