From f5390b8e639a8b4ded16302477fc27a32f59939e Mon Sep 17 00:00:00 2001
From: Steven Xu <stevenxxiu@gmail.com>
Date: Mon, 6 Jan 2020 22:53:12 +1100
Subject: [PATCH] We have to wrap gzip filse in `io.TextIOWrapper` if using
 text mode

---
 lib/cfv/fileutil.py | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/lib/cfv/fileutil.py b/lib/cfv/fileutil.py
index ecbd7eb..1d2ebd0 100644
--- a/lib/cfv/fileutil.py
+++ b/lib/cfv/fileutil.py
@@ -169,9 +169,14 @@ def open_write(filename, config):
 
     if config.gzip >= 2 or (config.gzip >= 0 and filename[-3:].lower() == '.gz'):
         import gzip
+        import io
         if filename == '-':
-            return gzip.GzipFile(filename=filename, mode=mode, fileobj=sys.stdout)
-        return gzip.open(filename, mode)
+            res = gzip.GzipFile(filename=filename, mode=mode, fileobj=sys.stdout)
+        else:
+            res = gzip.open(filename, mode)
+        if mode == 'w':
+            res = io.TextIOWrapper(res, encoding=encoding)
+        return res
     else:
         if filename == '-':
             return NoCloseFile(sys.stdout)