From f3c19ba7fa437a2512db5261742a494769f46b56 Mon Sep 17 00:00:00 2001
From: Maxime Coste <mawww@kakoune.org>
Date: Sun, 11 Feb 2018 20:35:21 +1100
Subject: [PATCH] Prevent whitespaces in command names

Fixes #1843
---
 src/commands.cc | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/commands.cc b/src/commands.cc
index de7d0c98a..8e58a7e6e 100644
--- a/src/commands.cc
+++ b/src/commands.cc
@@ -842,6 +842,9 @@ void define_command(const ParametersParser& parser, Context& context, const Shel
     const String& cmd_name = parser[0];
     auto& cm = CommandManager::instance();
 
+    if (contains_that(cmd_name, is_blank))
+        throw runtime_error(format("invalid command name: '{}'", cmd_name));
+
     if (cm.command_defined(cmd_name) and not parser.get_switch("allow-override"))
         throw runtime_error(format("command '{}' already defined", cmd_name));