From 44adf808ace6cb65a3353bd61fa585a2d8fe0db3 Mon Sep 17 00:00:00 2001
From: Lewis Russell <lewis6991@gmail.com>
Date: Thu, 31 Aug 2023 09:33:46 +0100
Subject: [PATCH] fix(actions.show): check buffer is attached

Fixes #865
---
 lua/gitsigns/actions.lua  | 7 ++++++-
 lua/gitsigns/diffthis.lua | 4 ++--
 2 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/lua/gitsigns/actions.lua b/lua/gitsigns/actions.lua
index c41a6a496..0843ac0b2 100644
--- a/lua/gitsigns/actions.lua
+++ b/lua/gitsigns/actions.lua
@@ -1079,8 +1079,13 @@ CP.diffthis = complete_heads
 --- Attributes: ~
 ---     {async}
 M.show = function(revision)
+  local bufnr = api.nvim_get_current_buf()
+  if not cache[bufnr] then
+    print('Error: Buffer is not attached.')
+    return
+  end
   local diffthis = require('gitsigns.diffthis')
-  diffthis.show(revision)
+  diffthis.show(bufnr, revision)
 end
 
 CP.show = complete_heads
diff --git a/lua/gitsigns/diffthis.lua b/lua/gitsigns/diffthis.lua
index f8b93e62e..e7e618466 100644
--- a/lua/gitsigns/diffthis.lua
+++ b/lua/gitsigns/diffthis.lua
@@ -160,9 +160,9 @@ M.diffthis = async.void(function(base, opts)
   api.nvim_set_current_win(cwin)
 end)
 
+--- @param bufnr integer
 --- @param base string
-M.show = async.void(function(base)
-  local bufnr = api.nvim_get_current_buf()
+M.show = async.void(function(bufnr, base)
   local bufname = create_show_buf(bufnr, base)
   if not bufname then
     return