From 40e2dcba05635442d147394c2369c360c931bcfb Mon Sep 17 00:00:00 2001
From: Tim Pope <code@tpope.net>
Date: Mon, 6 Aug 2018 01:21:19 -0400
Subject: [PATCH] Delegate to other real filename implementations

---
 autoload/fugitive.vim | 13 +++++++++----
 plugin/fugitive.vim   |  4 ++--
 2 files changed, 11 insertions(+), 6 deletions(-)

diff --git a/autoload/fugitive.vim b/autoload/fugitive.vim
index bdc11ed..5e30096 100644
--- a/autoload/fugitive.vim
+++ b/autoload/fugitive.vim
@@ -488,16 +488,21 @@ function! s:DirRev(url) abort
 endfunction
 
 function! fugitive#Real(url) abort
+  if empty(a:url)
+    return ''
+  endif
   let [dir, commit, file] = s:DirCommitFile(a:url)
   if len(dir)
     let tree = s:Tree(dir)
     return s:PlatformSlash((len(tree) ? tree : dir) . file)
   endif
-  let url = len(a:url) ? fnamemodify(a:url, ':p' . (a:url =~# '[\/]$' ? '' : ':s?[\/]$??')) : ''
-  if url =~# '^[\\/]\|^\a:[\\/]'
-    return s:PlatformSlash(url)
+  let pre = substitute(matchstr(a:url, '^\a\a\+\ze:'), '^.', '\u&', '')
+  if len(pre) && pre !=? 'fugitive' && exists('*' . pre . 'Real')
+    let url = {pre}Real(a:url)
+  else
+    let url = fnamemodify(a:url, ':p' . (a:url =~# '[\/]$' ? '' : ':s?[\/]$??'))
   endif
-  return ''
+  return s:PlatformSlash(empty(url) ? a:url : url)
 endfunction
 
 function! fugitive#Path(url, ...) abort
diff --git a/plugin/fugitive.vim b/plugin/fugitive.vim
index 1b18393..11b9fe1 100644
--- a/plugin/fugitive.vim
+++ b/plugin/fugitive.vim
@@ -34,9 +34,9 @@ endfunction
 
 function! FugitiveReal(...) abort
   let file = a:0 ? a:1 : @%
-  if file =~? '^fugitive:' || a:0 > 1
+  if file =~# '^\a\a\+:' || a:0 > 1
     return call('fugitive#Real', [file] + a:000[1:-1])
-  elseif file =~# '^/\|^\a\+:\|^$'
+  elseif file =~# '^/\|^\a:\|^$'
     return file
   else
     return fnamemodify(file, ':p' . (file =~# '[\/]$' ? '' : ':s?[\/]$??'))