[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/utils/__init__.py

@@ -1,8 +1,11 @@
-__all__ = ["TYPE_CHECKING", "NewType", "safe_delete"]
+__all__ = ["TYPE_CHECKING", "NewType", "safe_delete", "fuzzy_command_search"]
 
 from pathlib import Path
 import os
 import shutil
+from redbot.core import commands
+from fuzzywuzzy import process
+from .chat_formatting import box
 
 try:
     from typing import TYPE_CHECKING
@@ -26,3 +29,15 @@ def safe_delete(pth: Path):
             for f in files:
                 os.chmod(os.path.join(root, f), 0o755)
         shutil.rmtree(str(pth), ignore_errors=True)
+
+
+def fuzzy_command_search(ctx: commands.Context, term: str):
+    out = ""
+    for pos, extracted in enumerate(process.extract(term, ctx.bot.walk_commands(), limit=5), 1):
+        out += "{0}. {1.prefix}{2.qualified_name}{3}\n".format(
+            pos,
+            ctx,
+            extracted[0],
+            " - {}".format(extracted[0].short_doc) if extracted[0].short_doc else "",
+        )
+    return box(out, lang="Perhaps you wanted one of these?")