feature: Upgrade Plug

autoload/plug.vim

@@ -397,7 +397,20 @@ function! s:reorg_rtp()
 endfunction
 
 function! s:doautocmd(...)
-  execute 'doautocmd' ((v:version > 703 || has('patch442')) ? '<nomodeline>' : '') join(a:000)
+  if exists('#'.join(a:000, '#'))
+    execute 'doautocmd' ((v:version > 703 || has('patch442')) ? '<nomodeline>' : '') join(a:000)
+  endif
+endfunction
+
+function! s:dobufread(names)
+  for name in a:names
+    let path = s:rtp(g:plugs[name]).'/**'
+    for dir in ['ftdetect', 'ftplugin']
+      if len(finddir(dir, path))
+        return s:doautocmd('BufRead')
+      endif
+    endfor
+  endfor
 endfunction
 
 function! plug#load(...)
@@ -415,9 +428,7 @@ function! plug#load(...)
   for name in a:000
     call s:lod([name], ['ftdetect', 'after/ftdetect', 'plugin', 'after/plugin'])
   endfor
-  if exists('#BufRead')
-    doautocmd BufRead
-  endif
+  call s:dobufread(a:000)
   return 1
 endfunction
 
@@ -453,31 +464,27 @@ function! s:lod(names, types, ...)
       endif
       call s:source(rtp, a:2)
     endif
-    if exists('#User#'.name)
-      call s:doautocmd('User', name)
-    endif
+    call s:doautocmd('User', name)
   endfor
 endfunction
 
 function! s:lod_ft(pat, names)
   let syn = 'syntax/'.a:pat.'.vim'
   call s:lod(a:names, ['plugin', 'after/plugin'], syn, 'after/'.syn)
   execute 'autocmd! PlugLOD FileType' a:pat
-  if exists('#filetypeplugin#FileType')
-    doautocmd filetypeplugin FileType
-  endif
-  if exists('#filetypeindent#FileType')
-    doautocmd filetypeindent FileType
-  endif
+  call s:doautocmd('filetypeplugin', 'FileType')
+  call s:doautocmd('filetypeindent', 'FileType')
 endfunction
 
 function! s:lod_cmd(cmd, bang, l1, l2, args, names)
   call s:lod(a:names, ['ftdetect', 'after/ftdetect', 'plugin', 'after/plugin'])
+  call s:dobufread(a:names)
   execute printf('%s%s%s %s', (a:l1 == a:l2 ? '' : (a:l1.','.a:l2)), a:cmd, a:bang, a:args)
 endfunction
 
 function! s:lod_map(map, names, prefix)
   call s:lod(a:names, ['ftdetect', 'after/ftdetect', 'plugin', 'after/plugin'])
+  call s:dobufread(a:names)
   let extra = ''
   while 1
     let c = getchar(0)
@@ -486,6 +493,13 @@ function! s:lod_map(map, names, prefix)
     endif
     let extra .= nr2char(c)
   endwhile
+  if v:count
+    call feedkeys(v:count, 'n')
+  endif
+  call feedkeys('"'.v:register, 'n')
+  if mode(1) == 'no'
+    call feedkeys(v:operator)
+  endif
   call feedkeys(a:prefix . substitute(a:map, '^<Plug>', "\<Plug>", '') . extra)
 endfunction
 
@@ -722,15 +736,25 @@ function! s:assign_name()
   silent! execute 'f' fnameescape(name)
 endfunction
 
+function! s:chsh(swap)
+  let prev = [&shell, &shellredir]
+  if !s:is_win && a:swap
+    set shell=sh shellredir=>%s\ 2>&1
+  endif
+  return prev
+endfunction
+
 function! s:bang(cmd, ...)
   try
+    let [sh, shrd] = s:chsh(a:0)
     " FIXME: Escaping is incomplete. We could use shellescape with eval,
     "        but it won't work on Windows.
-    let cmd = a:0 > 0 ? s:with_cd(a:cmd, a:1) : a:cmd
+    let cmd = a:0 ? s:with_cd(a:cmd, a:1) : a:cmd
     let g:_plug_bang = '!'.escape(cmd, '#!%')
     execute "normal! :execute g:_plug_bang\<cr>\<cr>"
   finally
     unlet g:_plug_bang
+    let [&shell, &shellredir] = [sh, shrd]
   endtry
   return v:shell_error ? 'Exit status: ' . v:shell_error : ''
 endfunction
@@ -836,13 +860,14 @@ function! s:names(...)
 endfunction
 
 function! s:check_ruby()
-  silent! ruby require 'thread'; VIM::command('let g:plug_ruby = 1')
-  if get(g:, 'plug_ruby', 0)
-    unlet g:plug_ruby
-    return 1
+  silent! ruby require 'thread'; VIM::command("let g:plug_ruby = '#{RUBY_VERSION}'")
+  if !exists('g:plug_ruby')
+    redraw!
+    return s:warn('echom', 'Warning: Ruby interface is broken')
   endif
-  redraw!
-  return s:warn('echom', 'Warning: Ruby interface is broken')
+  let ruby_version = split(g:plug_ruby, '\.')
+  unlet g:plug_ruby
+  return s:version_requirement(ruby_version, [1, 8, 7])
 endfunction
 
 function! s:update_impl(pull, force, args) abort
@@ -1823,10 +1848,7 @@ endfunction
 
 function! s:system(cmd, ...)
   try
-    let [sh, shrd] = [&shell, &shellredir]
-    if !s:is_win
-      set shell=sh shellredir=>%s\ 2>&1
-    endif
+    let [sh, shrd] = s:chsh(1)
     let cmd = a:0 > 0 ? s:with_cd(a:cmd, a:1) : a:cmd
     return system(s:is_win ? '('.cmd.')' : cmd)
   finally