Added Alias cog (#780)

cogs/alias/alias_entry.py

@@ -0,0 +1,63 @@
+from typing import Tuple
+from discord.ext import commands
+
+import discord
+
+
+class AliasEntry:
+    def __init__(self, name: str, command: Tuple[str],
+                 creator: discord.Member, global_: bool=False):
+        super().__init__()
+        self.has_real_data = False
+        self.name = name
+        self.command = command
+        self.creator = creator
+
+        self.global_ = global_
+
+        self.guild = None
+        if hasattr(creator, "guild"):
+            self.guild = creator.guild
+
+        self.uses = 0
+
+    def inc(self):
+        """
+        Increases the `uses` stat by 1.
+        :return: new use count
+        """
+        self.uses += 1
+        return self.uses
+
+    def to_json(self) -> dict:
+        try:
+            creator = str(self.creator.id)
+            guild = str(self.guild.id)
+        except AttributeError:
+            creator = self.creator
+            guild = self.guild
+
+        return {
+            "name": self.name,
+            "command": self.command,
+            "creator": creator,
+            "guild": guild,
+            "global": self.global_,
+            "uses": self.uses
+        }
+
+    @classmethod
+    def from_json(cls, data: dict, bot: commands.Bot=None):
+        ret = cls(data["name"], data["command"],
+                  data["creator"], global_=data["global"])
+
+        if bot:
+            ret.has_real_data = True
+            ret.creator = bot.get_user(int(data["creator"]))
+            guild = bot.get_guild(int(data["guild"]))
+            ret.guild = guild
+        else:
+            ret.guild = data["guild"]
+
+        ret.uses = data.get("uses", 0)
+        return ret