Fix splitting strings

Python does not specify how many _fields_ I want, but how many _splits_
to do.

markdownrunner.py

@@ -74,13 +74,13 @@ def parse_snippet(s: Tuple[str, str]) -> Sequence[Command]:
 			directory = parts[1]
 			continue
 		elif line.startswith('sudo -u'):
-			parts = line.split(maxsplit=5)
+			parts = line.split(maxsplit=4)
 			assert parts[3] == '-H', "Insecure sudo?"
 			user = parts[2]
 			directory = f'~{user}'	# This actually works with SSH. That is nice, since we don't need to know the target's /etc/passwd
 			cmd = parts[4]
 		elif line.startswith('sudo'):
-			parts = line.split(maxsplit=2)
+			parts = line.split(maxsplit=1)
 			assert not parts[1].startswith('-'), "Weird sudo"
 			user = 'root'
 			cmd = parts[1]
@@ -141,7 +141,7 @@ def user_action(hunk: Sequence[Command], context=None) -> Sequence[Command]:
 			# Read the file back
 			new_hunk = []
 			for line in tmpfile.file.readlines():
-				parts = line.split('\t', maxsplit=3)
+				parts = line.split('\t', maxsplit=2)
 				new_hunk.append(Command(user=parts[0],directory=parts[1],command=parts[2],context=None))
 		# Python has no goto for restarting, but we can recurse
 		return user_action(new_hunk, context)