From 4b7600f3a589b609016312c250f591668e85293d Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Fri, 25 Jun 2021 10:25:54 +0530
Subject: [PATCH] Nicer error message on unknown entry point

---
 __main__.py | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/__main__.py b/__main__.py
index 42805d92f..458b06506 100644
--- a/__main__.py
+++ b/__main__.py
@@ -80,8 +80,14 @@ def edit_config_file(args: List[str]) -> None:
 
 
 def namespaced(args: List[str]) -> None:
-    func = namespaced_entry_points[args[1]]
-    func(args[1:])
+    try:
+        func = namespaced_entry_points[args[1]]
+    except KeyError:
+        pass
+    else:
+        func(args[1:])
+        return
+    raise SystemExit(f'{args[1]} is not a known entry point. Choices are: ' + ', '.join(namespaced_entry_points))
 
 
 entry_points = {