allow the tag cache count to be modified...

ui/medashare/tags.py

@@ -13,6 +13,22 @@ class TagCache:
 		self._count = count
 		self._modified = False
 
+	def _limit_count(self):
+		while len(self._cache) > self._count:
+			del self._cache[next(iter(self._cache.keys()))]
+
+	@property
+	def count(self):
+		'''The number of items allowed in the cache.'''
+
+		return self._count
+
+	@count.setter
+	def count(self, v):
+		self._count = v
+
+		self._limit_count()
+
 	@property
 	def modified(self):
 		'''Return if the cache has been modified since the last
@@ -33,8 +49,7 @@ class TagCache:
 
 		self._cache[tag] = None
 
-		while len(self._cache) > self._count:
-			del self._cache[next(iter(self._cache.keys()))]
+		self._limit_count()
 
 	def tags(self):
 		'''Returns the sorted list of tags in the cache.'''
@@ -119,3 +134,16 @@ class _TestTagCache(unittest.TestCase):
 
 		self.assertEqual(ntc.tags(), [ ('foo', 'foo'), ('whee', 'whee') ])
 
+		ntc.count = 3
+
+		ntc.add(('a', 'a'))
+
+		ntc.add(('b', 'b'))
+
+		self.assertEqual(ntc.tags(), [ ('a', 'a'), ('b', 'b'), ('whee', 'whee') ])
+
+		ntc.add(('whee', 'whee'))
+
+		ntc.count = 2
+
+		self.assertEqual(ntc.tags(), [ ('b', 'b'), ('whee', 'whee') ])