From c1704a2de0e3d963714ab462aa34b24f40b492f4 Mon Sep 17 00:00:00 2001
From: Christian Brabandt <cb@256bit.org>
Date: Fri, 23 Sep 2016 16:11:53 +0200
Subject: [PATCH] Do not overwrite v:shell_overwrite after ShellCmdPost

Prevents resetting v:shell_error from the followin system() call in
get_git_untracked.

Fixes #1266
---
 autoload/airline/extensions/branch.vim | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/autoload/airline/extensions/branch.vim b/autoload/airline/extensions/branch.vim
index 0618a44..6228bd6 100644
--- a/autoload/airline/extensions/branch.vim
+++ b/autoload/airline/extensions/branch.vim
@@ -203,7 +203,16 @@ function! s:check_in_path()
   return b:airline_file_in_root
 endfunction
 
-function! s:reset_untracked_cache()
+function! s:reset_untracked_cache(shellcmdpost)
+  if a:shellcmdpost
+    " function called after executing a shell command,
+    " only clear cache, if there was no error, else the
+    " system() command from get_git_untracked() would
+    " overwrite the v:shell_error status
+    if v:shell_error
+      return
+    endif
+  endif
   if exists("s:untracked_git")
     let s:untracked_git={}
   endif
@@ -218,5 +227,6 @@ function! airline#extensions#branch#init(ext)
   autocmd BufReadPost * unlet! b:airline_file_in_root
   autocmd CursorHold,ShellCmdPost,CmdwinLeave * unlet! b:airline_head
   autocmd User AirlineBeforeRefresh unlet! b:airline_head
-  autocmd BufWritePost,ShellCmdPost * call s:reset_untracked_cache()
+  autocmd BufWritePost * call s:reset_untracked_cache(0)
+  autocmd ShellCmdPost * call s:reset_untracked_cache(1)
 endfunction