From df47f19e86d2f6434fe20d37e2a98f96f2382ba7 Mon Sep 17 00:00:00 2001
From: Fabrice Laporte <kraymer@gmail.com>
Date: Sat, 28 Jun 2014 10:31:12 +0200
Subject: [PATCH] lastgenre: remove duplicate genres

---
 beetsplug/lastgenre/__init__.py | 9 +++++++++
 test/test_lastgenre.py          | 7 +++++++
 2 files changed, 16 insertions(+)

diff --git a/beetsplug/lastgenre/__init__.py b/beetsplug/lastgenre/__init__.py
index 364766f16..3981a4a3c 100644
--- a/beetsplug/lastgenre/__init__.py
+++ b/beetsplug/lastgenre/__init__.py
@@ -197,6 +197,15 @@ class LastGenrePlugin(plugins.BeetsPlugin):
                 if len(tags_all) >= count:
                     break
             tags = tags_all
+
+        def remove_duplicates(seq):
+            """Remove duplicates from sequence wile preserving order"""
+            seen = set()
+            seen_add = seen.add
+            return [ x for x in seq if x not in seen and not seen_add(x)]
+
+        tags = remove_duplicates(tags)
+
         # c14n only adds allowed genres but we may have had forbidden genres in
         # the original tags list
         tags = [x.title() for x in tags if self._is_allowed(x)]
diff --git a/test/test_lastgenre.py b/test/test_lastgenre.py
index 8fa5dc217..74ef402c7 100644
--- a/test/test_lastgenre.py
+++ b/test/test_lastgenre.py
@@ -129,6 +129,13 @@ class LastGenrePluginTest(unittest.TestCase, TestHelper):
         self.assertEqual(self.plugin._resolve_genres(['iota blues']),
                          '')
 
+    def test_no_duplicate(self):
+        """Remove duplicated genres.
+        """
+        self._setup_config(count=99)
+        self.assertEqual(self.plugin._resolve_genres(['blues', 'blues']),
+                         'Blues')
+
 
 def suite():
     return unittest.TestLoader().loadTestsFromName(__name__)