upgrade vim-plug

config/nvim/autoload/plug.vim

@@ -11,9 +11,13 @@
 "   call plug#begin('~/.vim/plugged')
 "
 "   " Make sure you use single quotes
-"   Plug 'junegunn/seoul256.vim'
+"
+"   " Shorthand notation; fetches https://github.com/junegunn/vim-easy-align
 "   Plug 'junegunn/vim-easy-align'
 "
+"   " Any valid git URL is allowed
+"   Plug 'https://github.com/junegunn/vim-github-dashboard.git'
+"
 "   " Group dependencies, vim-snippets depends on ultisnips
 "   Plug 'SirVer/ultisnips' | Plug 'honza/vim-snippets'
 "
@@ -21,9 +25,6 @@
 "   Plug 'scrooloose/nerdtree', { 'on':  'NERDTreeToggle' }
 "   Plug 'tpope/vim-fireplace', { 'for': 'clojure' }
 "
-"   " Using git URL
-"   Plug 'https://github.com/junegunn/vim-github-dashboard.git'
-"
 "   " Using a non-master branch
 "   Plug 'rdnetto/YCM-Generator', { 'branch': 'stable' }
 "
@@ -40,7 +41,21 @@
 "   call plug#end()
 "
 " Then reload .vimrc and :PlugInstall to install plugins.
-" Visit https://github.com/junegunn/vim-plug for more information.
+"
+" Plug options:
+"
+"| Option                  | Description                                      |
+"| ----------------------- | ------------------------------------------------ |
+"| `branch`/`tag`/`commit` | Branch/tag/commit of the repository to use       |
+"| `rtp`                   | Subdirectory that contains Vim plugin            |
+"| `dir`                   | Custom directory for the plugin                  |
+"| `as`                    | Use different name for the plugin                |
+"| `do`                    | Post-update hook (string or funcref)             |
+"| `on`                    | On-demand loading: Commands or `<Plug>`-mappings |
+"| `for`                   | On-demand loading: File types                    |
+"| `frozen`                | Do not update unless explicitly specified        |
+"
+" More information: https://github.com/junegunn/vim-plug
 "
 "
 " Copyright (c) 2015 Junegunn Choi
@@ -115,7 +130,7 @@ endfunction
 function! s:define_commands()
   command! -nargs=+ -bar Plug call s:add(<args>)
   if !executable('git')
-    return s:err('`git` executable not found. vim-plug requires git.')
+    return s:err('`git` executable not found. Most commands will not be available. To suppress this message, prepend `silent!` to `call plug#begin(...)`.')
   endif
   command! -nargs=* -bar -bang -complete=customlist,s:names PlugInstall call s:install(<bang>0, [<f-args>])
   command! -nargs=* -bar -bang -complete=customlist,s:names PlugUpdate  call s:update(<bang>0, [<f-args>])
@@ -450,9 +465,9 @@ function! s:add(repo, ...)
 
   try
     let repo = s:trim(a:repo)
-    let name = fnamemodify(repo, ':t:s?\.git$??')
+    let opts = a:0 == 1 ? s:parse_options(a:1) : s:base_spec
-    let spec = extend(s:infer_properties(name, repo),
+    let name = get(opts, 'as', fnamemodify(repo, ':t:s?\.git$??'))
-                    \ a:0 == 1 ? s:parse_options(a:1) : s:base_spec)
+    let spec = extend(s:infer_properties(name, repo), opts)
     if !has_key(g:plugs, name)
       call add(g:plugs_order, name)
     endif
@@ -620,32 +635,41 @@ function! s:switch_out(...)
   endif
 endfunction
 
-function! s:prepare()
+function! s:finish_bindings()
+  nnoremap <silent> <buffer> R  :silent! call <SID>retry()<cr>
+  nnoremap <silent> <buffer> D  :PlugDiff<cr>
+  nnoremap <silent> <buffer> S  :PlugStatus<cr>
+  nnoremap <silent> <buffer> U  :call <SID>status_update()<cr>
+  xnoremap <silent> <buffer> U  :call <SID>status_update()<cr>
+  nnoremap <silent> <buffer> ]] :silent! call <SID>section('')<cr>
+  nnoremap <silent> <buffer> [[ :silent! call <SID>section('b')<cr>
+endfunction
+
+function! s:prepare(...)
   call s:job_abort()
   if s:switch_in()
-    silent %d _
+    normal q
-  else
-    call s:new_window()
-    nnoremap <silent> <buffer> q  :if b:plug_preview==1<bar>pc<bar>endif<bar>bd<cr>
-    nnoremap <silent> <buffer> R  :silent! call <SID>retry()<cr>
-    nnoremap <silent> <buffer> D  :PlugDiff<cr>
-    nnoremap <silent> <buffer> S  :PlugStatus<cr>
-    nnoremap <silent> <buffer> U  :call <SID>status_update()<cr>
-    xnoremap <silent> <buffer> U  :call <SID>status_update()<cr>
-    nnoremap <silent> <buffer> ]] :silent! call <SID>section('')<cr>
-    nnoremap <silent> <buffer> [[ :silent! call <SID>section('b')<cr>
-    let b:plug_preview = -1
-    let s:plug_tab = tabpagenr()
-    let s:plug_buf = winbufnr(0)
-    call s:assign_name()
   endif
+
+  call s:new_window()
+  nnoremap <silent> <buffer> q  :if b:plug_preview==1<bar>pc<bar>endif<bar>bd<cr>
+  if a:0 == 0
+    call s:finish_bindings()
+  endif
+  let b:plug_preview = -1
+  let s:plug_tab = tabpagenr()
+  let s:plug_buf = winbufnr(0)
+  call s:assign_name()
+
   silent! unmap <buffer> <cr>
   silent! unmap <buffer> L
   silent! unmap <buffer> o
   silent! unmap <buffer> X
   setlocal buftype=nofile bufhidden=wipe nobuflisted noswapfile nowrap cursorline modifiable
   setf vim-plug
-  call s:syntax()
+  if exists('g:syntax_on')
+    call s:syntax()
+  endif
 endfunction
 
 function! s:assign_name()
@@ -755,6 +779,7 @@ function! s:finish(pull)
     call add(msgs, "Press 'D' to see the updated changes.")
   endif
   echo join(msgs, ' ')
+  call s:finish_bindings()
 endfunction
 
 function! s:retry()
@@ -829,7 +854,7 @@ function! s:update_impl(pull, force, args) abort
     \ 'fin':     0
   \ }
 
-  call s:prepare()
+  call s:prepare(1)
   call append(0, ['', ''])
   normal! 2G
   silent! redraw
@@ -840,7 +865,7 @@ function! s:update_impl(pull, force, args) abort
   " Python version requirement (>= 2.7)
   if python && !has('python3') && !ruby && !s:nvim && s:update.threads > 1
     redir => pyv
-    silent python import platform; print(platform.python_version())
+    silent python import platform; print platform.python_version()
     redir END
     let python = s:version_requirement(
           \ map(split(split(pyv)[0], '\.'), 'str2nr(v:val)'), [2, 6])
@@ -2017,8 +2042,12 @@ function! s:diff()
   let total = filter(copy(g:plugs), 's:is_managed(v:key) && isdirectory(v:val.dir)')
   call s:progress_bar(2, bar, len(total))
   for origin in [1, 0]
+    let plugs = reverse(sort(items(filter(copy(total), (origin ? '' : '!').'(has_key(v:val, "commit") || has_key(v:val, "tag"))'))))
+    if empty(plugs)
+      continue
+    endif
     call s:append_ul(2, origin ? 'Pending updates:' : 'Last update:')
-    for [k, v] in reverse(sort(items(filter(copy(total), (origin ? '' : '!').'(has_key(v:val, "commit") || has_key(v:val, "tag"))'))))
+    for [k, v] in plugs
       let range = origin ? '..origin/'.v.branch : 'HEAD@{1}..'
       let diff = s:system_chomp('git log --pretty=format:"%h%x01%d%x01%s%x01%cr" '.s:shellesc(range), v.dir)
       if !empty(diff)