From acfcb068ed210ce013a726da950b44be41391b90 Mon Sep 17 00:00:00 2001
From: Tim Pope <code@tpope.net>
Date: Sun, 29 Aug 2021 11:15:11 -0400
Subject: [PATCH] Don't append another filename when expanding ">commit:file"

This opens up the possibility of using ">" to navigate to a renamed
version of a file, for example.
---
 autoload/fugitive.vim | 18 ++++++++++++------
 1 file changed, 12 insertions(+), 6 deletions(-)

diff --git a/autoload/fugitive.vim b/autoload/fugitive.vim
index 79c01b6..d1c04ac 100644
--- a/autoload/fugitive.vim
+++ b/autoload/fugitive.vim
@@ -1804,14 +1804,20 @@ function! s:ExpandVar(other, var, flags, esc, ...) abort
 endfunction
 
 function! s:Expand(rev, ...) abort
-  if a:rev =~# '^:[0-3]$'
-    let file = len(expand('%')) ? a:rev . ':%' : '%'
+  if a:rev =~# '^>\=:[0-3]$'
+    let file = len(expand('%')) ? a:rev[-2:-1] . ':%' : '%'
   elseif a:rev ==# '>'
     let file = '%'
-  elseif a:rev =~# '^>[~^]'
-    let file = len(expand('%')) ? '!' . a:rev[1:-1] . ':%' : '%'
+  elseif a:rev ==# '>:'
+    let file = empty(s:DirCommitFile(@%)[0]) ? ':0:%' : '%'
   elseif a:rev =~# '^>[> ]\@!'
-    let file = len(expand('%')) ? a:rev[1:-1] . ':%' : '%'
+    let rev = (a:rev =~# '^>[~^]' ? '!' : '') . a:rev[1:-1]
+    let prefix = matchstr(rev, '^\%(\\.\|{[^{}]*}\|[^:]\)*')
+    if prefix !=# rev
+      let file = rev
+    else
+      let file = len(expand('%')) ? rev . ':%' : '%'
+    endif
   else
     let file = a:rev
   endif
@@ -5676,7 +5682,7 @@ function! s:OpenParse(string, wants_cmd) abort
       break
     endif
   endwhile
-  if len(args)
+  if len(args) && args !=# ['>:']
     let file = join(args)
     if file ==# '-'
       let result = fugitive#Result()