From 5fc9eab788608fb4adcb07a8d79354dcafefaa6a Mon Sep 17 00:00:00 2001
From: Junegunn Choi <junegunn.c@gmail.com>
Date: Wed, 4 Jan 2017 01:57:09 +0900
Subject: [PATCH] Add --sync flag to Plug{Install,Update}

Installer is not synchronous when started on VimEnter since
has('vim_starting') returns 0 in that case. We needed a way to make the
installer synchronous.

Related: #574
---
 plug.vim | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/plug.vim b/plug.vim
index ca0c3e2..95d8eab 100644
--- a/plug.vim
+++ b/plug.vim
@@ -61,7 +61,7 @@
 " More information: https://github.com/junegunn/vim-plug
 "
 "
-" Copyright (c) 2016 Junegunn Choi
+" Copyright (c) 2017 Junegunn Choi
 "
 " MIT License
 "
@@ -919,7 +919,8 @@ function! s:check_ruby()
 endfunction
 
 function! s:update_impl(pull, force, args) abort
-  let args = copy(a:args)
+  let sync = index(a:args, '--sync') >= 0 || has('vim_starting')
+  let args = filter(copy(a:args), 'v:val != "--sync"')
   let threads = (len(args) > 0 && args[-1] =~ '^[1-9][0-9]*$') ?
                   \ remove(args, -1) : get(g:, 'plug_threads', 16)
 
@@ -1020,7 +1021,7 @@ function! s:update_impl(pull, force, args) abort
     endtry
   else
     call s:update_vim()
-    while use_job && has('vim_starting')
+    while use_job && sync
       sleep 100m
       if s:update.fin
         break