From a09e49d2bba074a4cc37ed850a556b3604837ff8 Mon Sep 17 00:00:00 2001
From: Tim Pope <code@tpope.net>
Date: Thu, 8 Aug 2019 20:20:45 -0400
Subject: [PATCH] Support :Gblame --reverse

Closes https://github.com/tpope/vim-fugitive/issues/1305
---
 autoload/fugitive.vim | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/autoload/fugitive.vim b/autoload/fugitive.vim
index e703693..bb429ad 100644
--- a/autoload/fugitive.vim
+++ b/autoload/fugitive.vim
@@ -4615,18 +4615,19 @@ function! s:BlameCommand(line1, line2, range, count, bang, mods, reg, arg, args)
     if empty(s:Relative('/'))
       call s:throw('file or blob required')
     endif
+    let commit = matchstr(s:DirCommitFile(@%)[1], '^\x\x\+$')
     if filter(copy(a:args),'v:val !~# "^-"') != []
       call s:throw("'-' required for all options")
-    elseif filter(copy(a:args),'v:val !~# "^\\%(--abbrev=\\d*\\|--relative-date\\|--first-parent\\|--root\\|--show-name\\|-\\%([ltfnsew]\\|[MC]\\d*\\)\\+\\)$"') != []
-      call s:throw('unsupported option')
+    elseif filter(copy(a:args),'v:val !~# "^\\%(--abbrev=\\d*\\|--relative-date\\|--first-parent\\|--root\\|--show-name' . (len(commit) ? '\\|--reverse' : '') . '\\|-\\%([ltfnsew]\\|[MC]\\d*\\)\\+\\)$"') != []
+      call s:throw('unsupported option' . commit)
     endif
     let cmd = ['--no-pager', '-c', 'blame.coloring=none', 'blame', '--show-number']
     if a:count > 0
       let cmd += ['-L', (a:line1 ? a:line1 : line('.')) . ',' . (a:line1 ? a:line1 : line('.'))]
     endif
     let cmd += a:args
-    if s:DirCommitFile(@%)[1] =~# '\D\|..'
-      let cmd += [s:DirCommitFile(@%)[1]]
+    if len(commit)
+      let cmd += [commit]
     else
       let cmd += ['--contents', '-']
     endif