[V3] Start work on fuzzy command search (#1600)

* [V3] Start work on fuzzy command search

* Implement in command error handler

* Something isn't working here, try fixing

* Style compliance

* Add fuzzywuzzy to pipfile

* Dump the short doc part if there is no short doc

* Add fuzzy command search on command not found in help

* Move things around, implement for use of default d.py help formatter

* Formatting compliance

* Undo pipfile changes

redbot/core/events.py

@@ -15,7 +15,8 @@ from discord.ext import commands
 
 from . import __version__
 from .data_manager import storage_type
-from .utils.chat_formatting import inline, bordered
+from .utils.chat_formatting import inline, bordered, pagify, box
+from .utils import fuzzy_command_search
 from colorama import Fore, Style, init
 
 log = logging.getLogger("red")
@@ -221,7 +222,10 @@ def init_events(bot, cli_flags):
             if not hasattr(ctx.cog, "_{0.command.cog_name}__error".format(ctx)):
                 await ctx.send(inline(message))
         elif isinstance(error, commands.CommandNotFound):
-            pass
+            term = ctx.invoked_with + " "
+            if len(ctx.args) > 1:
+                term += " ".join(ctx.args[1:])
+            await ctx.maybe_send_embed(fuzzy_command_search(ctx, ctx.invoked_with))
         elif isinstance(error, commands.CheckFailure):
             await ctx.send("⛔ You are not authorized to issue that command.")
         elif isinstance(error, commands.NoPrivateMessage):