From 237e4a94550d5ca47223cea70e925e3488ba39f6 Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Mon, 26 Sep 2016 11:28:25 +0530
Subject: [PATCH] Edit Book: Auto-add file extension when using the Save a Copy
 dialog if it is missing. Fixes #1627482 [save a copy as EPUB does not add
 automatically .epub extension to
 file](https://bugs.launchpad.net/calibre/+bug/1627482)

---
 src/calibre/gui2/tweak_book/boss.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/calibre/gui2/tweak_book/boss.py b/src/calibre/gui2/tweak_book/boss.py
index fa6144f300..58366e6793 100644
--- a/src/calibre/gui2/tweak_book/boss.py
+++ b/src/calibre/gui2/tweak_book/boss.py
@@ -1065,6 +1065,8 @@ class Boss(QObject):
             filters=[(_('Book (%s)') % ext.upper(), [ext.lower()])], all_files=False)
         if not path:
             return
+        if '.' not in os.path.basename(path):
+            path += '.' + ext.lower()
         tdir = self.mkdtemp(prefix='save-copy-')
         container = clone_container(c, tdir)
         for name, ed in editors.iteritems():