From 32035af5a7a64af1476965b21a25c0276fee8899 Mon Sep 17 00:00:00 2001
From: Kim Wittenburg <5wittenb@informatik.uni-hamburg.de>
Date: Mon, 3 Sep 2018 22:25:54 +0200
Subject: [PATCH] Move configuration check to plugin initalization

---
 beetsplug/cleantags.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/beetsplug/cleantags.py b/beetsplug/cleantags.py
index d027978..0a42b05 100644
--- a/beetsplug/cleantags.py
+++ b/beetsplug/cleantags.py
@@ -11,6 +11,8 @@ class CleanTagsPlugin(BeetsPlugin):
             'keep': [], # Tags to write to files.
             'discard': [] # Tags to discard
         })
+        if self.keep_tags and self.discard_tags:
+            raise ConfigValueError('Cannot specify both "keep" and "discard" for cleantags plugin.')
         self.register_listener('write', self.clear_metadata)
             
     @property
@@ -26,8 +28,6 @@ class CleanTagsPlugin(BeetsPlugin):
         return self.config['discard'].as_str_seq()
     
     def clear_metadata(self, item, path, tags):
-        if self.keep_tags and self.discard_tags:
-            raise ConfigValueError('Cannot specify both "keep" and "discard" for cleantags plugin.')
         if self.clean:
             file = File(path)
             file.delete()