Add plugin data

plugin.py

@@ -1,3 +1,4 @@
+import json, traceback
 cmds = {}
 help = {}
 listeners = {}
@@ -22,6 +23,33 @@ class CommandGroup:
 		else:
 			return self.subcmds[self.default](bot,channel,nick,subcmd,*args)
 
+class Data:
+	"""A class for plugin data."""
+	def __init__(self,value):
+		self.value = value
+	def serialize(self):
+		return self.value
+	def deserialize(self,value):
+		self.value = value
+	def save(self,filename):
+		with open(filename,"w") as f:
+			f.write(self.serialize())
+	def load(self,filename):
+		try:
+			with open(filename) as f:
+				self.deserialize(f.read())
+		except:
+			print("Error loading data from {!r}:".format(filename))
+			traceback.print_exc()
+			pass # You should've initialized this with a sane default, so just keep the default on error
+
+class JSONData(Data):
+	"""Data, but can be serialized to JSON (and should be)."""
+	def serialize(self):
+		return json.dumps(self.value)
+	def deserialize(self,value):
+		self.value = json.loads(value)
+
 def clear():
 	cmds.clear()
 	help.clear()