rewrite: Initial rewrite skeleton.

Remove modules that will no longer be required.
Move pending modules to pending-rewrite folders.

bot/modules/pending-rewrite/sysadmin/guild_log.py

@@ -0,0 +1,83 @@
+import datetime
+import discord
+
+from meta import client, conf
+from utils.lib import mail
+
+
+@client.add_after_event("guild_remove")
+async def log_left_guild(client, guild):
+    # Build embed
+    embed = discord.Embed(title="`{0.name} (ID: {0.id})`".format(guild),
+                          colour=discord.Colour.red(),
+                          timestamp=datetime.datetime.utcnow())
+    embed.set_author(name="Left guild!")
+    embed.set_thumbnail(url=guild.icon_url)
+
+    # Add more specific information about the guild
+    embed.add_field(name="Owner", value="{0.name} (ID: {0.id})".format(guild.owner), inline=False)
+    embed.add_field(name="Members (cached)", value="{}".format(len(guild.members)), inline=False)
+    embed.add_field(name="Now studying in", value="{} guilds".format(len(client.guilds)), inline=False)
+
+    # Retrieve the guild log channel and log the event
+    log_chid = conf.bot.get("guild_log_channel")
+    if log_chid:
+        await mail(client, log_chid, embed=embed)
+
+
+@client.add_after_event("guild_join")
+async def log_joined_guild(client, guild):
+    owner = guild.owner
+    icon = guild.icon_url
+
+    bots = 0
+    known = 0
+    unknown = 0
+    other_members = set(mem.id for mem in client.get_all_members() if mem.guild != guild)
+
+    for member in guild.members:
+        if member.bot:
+            bots += 1
+        elif member.id in other_members:
+            known += 1
+        else:
+            unknown += 1
+
+    mem1 = "people I know" if known != 1 else "person I know"
+    mem2 = "new friends" if unknown != 1 else "new friend"
+    mem3 = "bots" if bots != 1 else "bot"
+    mem4 = "total members"
+    known = "`{}`".format(known)
+    unknown = "`{}`".format(unknown)
+    bots = "`{}`".format(bots)
+    total = "`{}`".format(guild.member_count)
+    mem_str = "{0:<5}\t{4},\n{1:<5}\t{5},\n{2:<5}\t{6}, and\n{3:<5}\t{7}.".format(
+        known,
+        unknown,
+        bots,
+        total,
+        mem1,
+        mem2,
+        mem3,
+        mem4
+    )
+    region = str(guild.region)
+    created = "<t:{}>".format(int(guild.created_at.timestamp()))
+
+    embed = discord.Embed(
+        title="`{0.name} (ID: {0.id})`".format(guild),
+        colour=discord.Colour.green(),
+        timestamp=datetime.datetime.utcnow()
+    )
+    embed.set_author(name="Joined guild!")
+
+    embed.add_field(name="Owner", value="{0} (ID: {0.id})".format(owner), inline=False)
+    embed.add_field(name="Region", value=region, inline=False)
+    embed.add_field(name="Created at", value=created, inline=False)
+    embed.add_field(name="Members", value=mem_str, inline=False)
+    embed.add_field(name="Now studying in", value="{} guilds".format(len(client.guilds)), inline=False)
+
+    # Retrieve the guild log channel and log the event
+    log_chid = conf.bot.get("guild_log_channel")
+    if log_chid:
+        await mail(client, log_chid, embed=embed)