From 5908766e9dc415b0fb97dbba57e67dba918e88d0 Mon Sep 17 00:00:00 2001
From: Lars-Dominik Braun <lars@6xq.net>
Date: Thu, 21 Oct 2021 15:44:08 +0200
Subject: text: epub: Prevent memory leak

It looks like ebooklib creates non-GC-able references to ZipFile, which
must be cleaned up manually.
---
 lulua/text.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/lulua/text.py b/lulua/text.py
index 18e4dbf..ea91139 100644
--- a/lulua/text.py
+++ b/lulua/text.py
@@ -193,6 +193,10 @@ def filterEpub (item):
         stream = walker (document)
         s = HTMLSerializer()
         yield ''.join (s.serialize (stream))
+    # It looks like ebooklib is leaking ZipFile instances somewhere, which
+    # can be prevented by resetting the book before the GC grabs it.
+    book.reset ()
+    del book
 
 def filterText (fd):
     yield fd.read ().decode ('utf-8')
-- 
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