update plug.vim

autoload/plug.vim

@@ -18,7 +18,7 @@
 "   " Any valid git URL is allowed
 "   Plug 'https://github.com/junegunn/vim-github-dashboard.git'
 "
-"   " Group dependencies, vim-snippets depends on ultisnips
+"   " Multiple Plug commands can be written in a single line using | separators
 "   Plug 'SirVer/ultisnips' | Plug 'honza/vim-snippets'
 "
 "   " On-demand loading
@@ -40,7 +40,7 @@
 "   " Unmanaged plugin (manually installed and updated)
 "   Plug '~/my-prototype-plugin'
 "
-"   " Add plugins to &runtimepath
+"   " Initialize plugin system
 "   call plug#end()
 "
 " Then reload .vimrc and :PlugInstall to install plugins.
@@ -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
@@ -2288,7 +2289,12 @@ function! s:preview_commit()
     wincmd P
   endif
   setlocal previewwindow filetype=git buftype=nofile nobuflisted modifiable
+  try
+    let [sh, shrd] = s:chsh(1)
     execute 'silent %!cd' s:shellesc(g:plugs[name].dir) '&& git show --no-color --pretty=medium' sha
+  finally
+    let [&shell, &shellredir] = [sh, shrd]
+  endtry
   setlocal nomodifiable
   nnoremap <silent> <buffer> q :q<cr>
   wincmd p