use open as a context manager instead of oneline open().read()

While open().read() is nice for its terseness it has the problem that it
causes an fd to leak until the gc collects it. For short lived scripts
this isn't a big deal, but for a program like alot that run for long
periods of time it's better to be correct and ensure that the fd is
closed.

1 files changed, 2 insertions, 1 deletions

diff --git a/alot/helper.py b/alot/helper.py
index f968306d..ba68bd45 100644
--- a/alot/helper.py
+++ b/alot/helper.py
@@ -465,7 +465,8 @@ def libmagic_version_at_least(version):
 
 # TODO: make this work on blobs, not paths
 def mimewrap(path, filename=None, ctype=None):
-    content = open(path, 'rb').read()
+    with open(path, 'rb') as f:
+        content = f.read()
     if not ctype:
         ctype = guess_mimetype(content)
         # libmagic < 5.12 incorrectly detects excel/powerpoint files as