From b7e57637ba8e6cb784dbe32b25acf17d44542871 Mon Sep 17 00:00:00 2001
From: Tim Pope <code@tpope.net>
Date: Sat, 21 Jul 2018 16:52:06 -0400
Subject: [PATCH] Add warning for editing invalid Fugitive URL

Closes https://github.com/tpope/vim-fugitive/issues/1060
---
 autoload/fugitive.vim | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/autoload/fugitive.vim b/autoload/fugitive.vim
index d37f932..0802adf 100644
--- a/autoload/fugitive.vim
+++ b/autoload/fugitive.vim
@@ -2841,6 +2841,9 @@ function! fugitive#BufReadCmd(...) abort
   let amatch = a:0 ? a:1 : expand('<amatch>')
   try
     let [dir, rev] = s:DirRev(amatch)
+    if empty(dir)
+      return 'echo "Invalid Fugitive URL"'
+    endif
     let b:fugitive_type = system(fugitive#Prepare(dir, 'cat-file', '-t', rev))[0:-2]
     if v:shell_error
       unlet b:fugitive_type