Update plug.vim to a recent version

.vim/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'
 "
@@ -21,25 +25,43 @@
 "   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' }
+"
+"   " Using a tagged release; wildcard allowed (requires git 1.9.2 or above)
+"   Plug 'fatih/vim-go', { 'tag': '*' }
 "
 "   " Plugin options
 "   Plug 'nsf/gocode', { 'tag': 'v.20150303', 'rtp': 'vim' }
 "
 "   " Plugin outside ~/.vim/plugged with post-update hook
-"   Plug 'junegunn/fzf', { 'dir': '~/.fzf', 'do': 'yes \| ./install' }
+"   Plug 'junegunn/fzf', { 'dir': '~/.fzf', 'do': './install --all' }
 "
 "   " Unmanaged plugin (manually installed and updated)
 "   Plug '~/my-prototype-plugin'
 "
+"   " Add plugins to &runtimepath
 "   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        |
 "
-" Copyright (c) 2015 Junegunn Choi
+" More information: https://github.com/junegunn/vim-plug
+"
+"
+" Copyright (c) 2016 Junegunn Choi
 "
 " MIT License
 "
@@ -109,17 +131,17 @@ function! plug#begin(...)
 endfunction
 
 function! s:define_commands()
-  command! -nargs=+ -bar Plug call s:add(<args>)
+  command! -nargs=+ -bar Plug call plug#(<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>' == '!', [<f-args>])
-  command! -nargs=* -bar -bang -complete=customlist,s:names PlugUpdate  call s:update('<bang>' == '!', [<f-args>])
-  command! -nargs=0 -bar -bang PlugClean call s:clean('<bang>' == '!')
+  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>])
+  command! -nargs=0 -bar -bang PlugClean call s:clean(<bang>0)
   command! -nargs=0 -bar PlugUpgrade if s:upgrade() | execute 'source' s:esc(s:me) | endif
   command! -nargs=0 -bar PlugStatus  call s:status()
   command! -nargs=0 -bar PlugDiff    call s:diff()
-  command! -nargs=? -bar PlugSnapshot call s:snapshot(<f-args>)
+  command! -nargs=? -bar -bang -complete=file PlugSnapshot call s:snapshot(<bang>0, <f-args>)
 endfunction
 
 function! s:to_a(v)
@@ -130,18 +152,43 @@ function! s:to_s(v)
   return type(a:v) == s:TYPE.string ? a:v : join(a:v, "\n") . "\n"
 endfunction
 
+function! s:glob(from, pattern)
+  return s:lines(globpath(a:from, a:pattern))
+endfunction
+
 function! s:source(from, ...)
+  let found = 0
   for pattern in a:000
-    for vim in s:lines(globpath(a:from, pattern))
+    for vim in s:glob(a:from, pattern)
       execute 'source' s:esc(vim)
+      let found = 1
     endfor
   endfor
+  return found
 endfunction
 
 function! s:assoc(dict, key, val)
   let a:dict[a:key] = add(get(a:dict, a:key, []), a:val)
 endfunction
 
+function! s:ask(message, ...)
+  call inputsave()
+  echohl WarningMsg
+  let answer = input(a:message.(a:0 ? ' (y/N/a) ' : ' (y/N) '))
+  echohl None
+  call inputrestore()
+  echo "\r"
+  return (a:0 && answer =~? '^a') ? 2 : (answer =~? '^y') ? 1 : 0
+endfunction
+
+function! s:ask_no_interrupt(...)
+  try
+    return call('s:ask', a:000)
+  catch
+    return 0
+  endtry
+endfunction
+
 function! plug#end()
   if !exists('g:plugs')
     return s:err('Call plug#begin() first')
@@ -157,6 +204,9 @@ function! plug#end()
 
   filetype off
   for name in g:plugs_order
+    if !has_key(g:plugs, name)
+      continue
+    endif
     let plug = g:plugs[name]
     if get(s:loaded, name, 0) || !has_key(plug, 'on') && !has_key(plug, 'for')
       let s:loaded[name] = 1
@@ -171,11 +221,14 @@ function! plug#end()
             call s:assoc(lod.map, cmd, name)
           endif
           call add(s:triggers[name].map, cmd)
-        elseif cmd =~ '^[A-Z]'
+        elseif cmd =~# '^[A-Z]'
           if exists(':'.cmd) != 2
             call s:assoc(lod.cmd, cmd, name)
           endif
           call add(s:triggers[name].cmd, cmd)
+        else
+          call s:err('Invalid `on` option: '.cmd.
+          \ '. Should start with an uppercase letter or `<Plug>`.')
         endif
       endfor
     endif
@@ -183,7 +236,9 @@ function! plug#end()
     if has_key(plug, 'for')
       let types = s:to_a(plug.for)
       if !empty(types)
+        augroup filetypedetect
         call s:source(s:rtp(plug), 'ftdetect/**/*.vim', 'after/ftdetect/**/*.vim')
+        augroup END
       endif
       for type in types
         call s:assoc(lod.ft, type, name)
@@ -216,9 +271,11 @@ function! plug#end()
   call s:reorg_rtp()
   filetype plugin indent on
   if has('vim_starting')
-    syntax enable
+    if has('syntax') && !exists('g:syntax_on')
+      syntax enable
+    end
   else
-    call s:reload()
+    call s:reload_plugins()
   endif
 endfunction
 
@@ -226,9 +283,13 @@ function! s:loaded_names()
   return filter(copy(g:plugs_order), 'get(s:loaded, v:val, 0)')
 endfunction
 
-function! s:reload()
+function! s:load_plugin(spec)
+  call s:source(s:rtp(a:spec), 'plugin/**/*.vim', 'after/plugin/**/*.vim')
+endfunction
+
+function! s:reload_plugins()
   for name in s:loaded_names()
-    call s:source(s:rtp(g:plugs[name]), 'plugin/**/*.vim', 'after/plugin/**/*.vim')
+    call s:load_plugin(g:plugs[name])
   endfor
 endfunction
 
@@ -247,8 +308,9 @@ function! s:version_requirement(val, min)
 endfunction
 
 function! s:git_version_requirement(...)
-  let s:git_version = get(s:, 'git_version',
-    \ map(split(split(s:system('git --version'))[-1], '\.'), 'str2nr(v:val)'))
+  if !exists('s:git_version')
+    let s:git_version = map(split(split(s:system('git --version'))[-1], '\.'), 'str2nr(v:val)')
+  endif
   return s:version_requirement(s:git_version, a:000)
 endfunction
 
@@ -293,9 +355,14 @@ endif
 
 function! s:err(msg)
   echohl ErrorMsg
-  echom a:msg
+  echom '[vim-plug] '.a:msg
+  echohl None
+endfunction
+
+function! s:warn(cmd, msg)
+  echohl WarningMsg
+  execute a:cmd 'a:msg'
   echohl None
-  return 0
 endfunction
 
 function! s:esc(path)
@@ -344,6 +411,23 @@ function! s:reorg_rtp()
   endif
 endfunction
 
+function! s:doautocmd(...)
+  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(...)
   if a:0 == 0
     return s:err('Argument missing: plugin name(s) required')
@@ -359,9 +443,7 @@ 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
 
@@ -379,7 +461,7 @@ function! s:remove_triggers(name)
   call remove(s:triggers, a:name)
 endfunction
 
-function! s:lod(names, types)
+function! s:lod(names, types, ...)
   for name in a:names
     call s:remove_triggers(name)
     let s:loaded[name] = 1
@@ -391,30 +473,33 @@ function! s:lod(names, types)
     for dir in a:types
       call s:source(rtp, dir.'/**/*.vim')
     endfor
-    if exists('#User#'.name)
-      execute 'doautocmd User' name
+    if a:0
+      if !s:source(rtp, a:1) && !empty(s:glob(rtp, a:2))
+        execute 'runtime' a:1
+      endif
+      call s:source(rtp, a:2)
     endif
+    call s:doautocmd('User', name)
   endfor
 endfunction
 
 function! s:lod_ft(pat, names)
-  call s:lod(a:names, ['plugin', 'after/plugin'])
+  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)
@@ -423,19 +508,26 @@ 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
 
-function! s:add(repo, ...)
+function! plug#(repo, ...)
   if a:0 > 1
     return s:err('Invalid number of arguments (1..2)')
   endif
 
   try
     let repo = s:trim(a:repo)
-    let name = fnamemodify(repo, ':t:s?\.git$??')
-    let spec = extend(s:infer_properties(name, repo),
-                    \ a:0 == 1 ? s:parse_options(a:1) : s:base_spec)
+    let opts = a:0 == 1 ? s:parse_options(a:1) : s:base_spec
+    let name = get(opts, 'as', fnamemodify(repo, ':t:s?\.git$??'))
+    let spec = extend(s:infer_properties(name, repo), opts)
     if !has_key(g:plugs, name)
       call add(g:plugs_order, name)
     endif
@@ -514,16 +606,23 @@ function! s:syntax()
   syn match plugStar /^*/
   syn match plugMessage /\(^- \)\@<=.*/
   syn match plugName /\(^- \)\@<=[^ ]*:/
+  syn match plugSha /\%(: \)\@<=[0-9a-f]\{4,}$/
+  syn match plugTag /(tag: [^)]\+)/
   syn match plugInstall /\(^+ \)\@<=[^:]*/
   syn match plugUpdate /\(^* \)\@<=[^:]*/
-  syn match plugCommit /^  [0-9a-z]\{7} .*/ contains=plugRelDate,plugSha
-  syn match plugSha /\(^  \)\@<=[0-9a-z]\{7}/ contained
+  syn match plugCommit /^  \X*[0-9a-f]\{7} .*/ contains=plugRelDate,plugEdge,plugTag
+  syn match plugEdge /^  \X\+$/
+  syn match plugEdge /^  \X*/ contained nextgroup=plugSha
+  syn match plugSha /[0-9a-f]\{7}/ contained
   syn match plugRelDate /([^)]*)$/ contained
   syn match plugNotLoaded /(not loaded)$/
   syn match plugError /^x.*/
+  syn region plugDeleted start=/^\~ .*/ end=/^\ze\S/
+  syn match plugH2 /^.*:\n-\+$/
   syn keyword Function PlugInstall PlugStatus PlugUpdate PlugClean
   hi def link plug1       Title
   hi def link plug2       Repeat
+  hi def link plugH2      Type
   hi def link plugX       Exception
   hi def link plugBracket Structure
   hi def link plugNumber  Number
@@ -538,8 +637,11 @@ function! s:syntax()
   hi def link plugUpdate  Type
 
   hi def link plugError   Error
+  hi def link plugDeleted Ignore
   hi def link plugRelDate Comment
+  hi def link plugEdge    PreProc
   hi def link plugSha     Identifier
+  hi def link plugTag     Constant
 
   hi def link plugNotLoaded Comment
 endfunction
@@ -598,32 +700,50 @@ function! s:switch_out(...)
   endif
 endfunction
 
-function! s:prepare()
+function! s:finish_bindings()
+  nnoremap <silent> <buffer> R  :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(...)
+  if empty(getcwd())
+    throw 'Invalid current working directory. Cannot proceed.'
+  endif
+
+  for evar in ['$GIT_DIR', '$GIT_WORK_TREE']
+    if exists(evar)
+      throw evar.' detected. Cannot proceed.'
+    endif
+  endfor
+
   call s:job_abort()
   if s:switch_in()
-    silent %d _
-  else
-    call s:new_window()
-    nnoremap <silent> <buffer> q  :if b:plug_preview==1<bar>pc<bar>endif<bar>echo<bar>q<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
-  silent! unmap <buffer> <cr>
-  silent! unmap <buffer> L
-  silent! unmap <buffer> o
-  silent! unmap <buffer> X
+    normal q
+  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()
+
+  for k in ['<cr>', 'L', 'o', 'X', 'd', 'dd']
+    execute 'silent! unmap <buffer>' k
+  endfor
   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()
@@ -638,6 +758,38 @@ 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 ? 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
+
+function! s:regress_bar()
+  let bar = substitute(getline(2)[1:-2], '.*\zs=', 'x', '')
+  call s:progress_bar(2, bar, len(bar))
+endfunction
+
+function! s:is_updated(dir)
+  return !empty(s:system_chomp('git log --pretty=format:"%h" "HEAD...HEAD@{1}"', a:dir))
+endfunction
+
 function! s:do(pull, force, todo)
   for [name, spec] in items(a:todo)
     if !isdirectory(spec.dir)
@@ -645,45 +797,62 @@ function! s:do(pull, force, todo)
     endif
     let installed = has_key(s:update.new, name)
     let updated = installed ? 0 :
-      \ (a:pull && !empty(s:system_chomp('git log --pretty=format:"%h" "HEAD...HEAD@{1}"', spec.dir)))
+      \ (a:pull && index(s:update.errors, name) < 0 && s:is_updated(spec.dir))
     if a:force || installed || updated
       execute 'cd' s:esc(spec.dir)
       call append(3, '- Post-update hook for '. name .' ... ')
+      let error = ''
       let type = type(spec.do)
       if type == s:TYPE.string
-        try
-          " FIXME: Escaping is incomplete. We could use shellescape with eval,
-          "        but it won't work on Windows.
-          let g:_plug_do = '!'.escape(spec.do, '#!%')
-          execute "normal! :execute g:_plug_do\<cr>\<cr>"
-        finally
-          let result = v:shell_error ? ('Exit status: '.v:shell_error) : 'Done!'
-          unlet g:_plug_do
-        endtry
+        if spec.do[0] == ':'
+          call s:load_plugin(spec)
+          execute spec.do[1:]
+        else
+          let error = s:bang(spec.do)
+        endif
       elseif type == s:TYPE.funcref
         try
           let status = installed ? 'installed' : (updated ? 'updated' : 'unchanged')
           call spec.do({ 'name': name, 'status': status, 'force': a:force })
-          let result = 'Done!'
         catch
-          let result = 'Error: ' . v:exception
+          let error = v:exception
         endtry
       else
-        let result = 'Error: Invalid type!'
+        let error = 'Invalid hook type'
+      endif
+      call s:switch_in()
+      call setline(4, empty(error) ? (getline(4) . 'OK')
+                                 \ : ('x' . getline(4)[1:] . error))
+      if !empty(error)
+        call add(s:update.errors, name)
+        call s:regress_bar()
       endif
-      call setline(4, getline(4) . result)
       cd -
     endif
   endfor
 endfunction
 
+function! s:hash_match(a, b)
+  return stridx(a:a, a:b) == 0 || stridx(a:b, a:a) == 0
+endfunction
+
+function! s:checkout(spec)
+  let sha = a:spec.commit
+  let output = s:system('git rev-parse HEAD', a:spec.dir)
+  if !v:shell_error && !s:hash_match(sha, s:lines(output)[0])
+    let output = s:system(
+          \ 'git fetch --depth 999999 && git checkout '.s:esc(sha), a:spec.dir)
+  endif
+  return output
+endfunction
+
 function! s:finish(pull)
   let new_frozen = len(filter(keys(s:update.new), 'g:plugs[v:val].frozen'))
   if new_frozen
     let s = new_frozen > 1 ? 's' : ''
     call append(3, printf('- Installed %d frozen plugin%s', new_frozen, s))
   endif
-  call append(3, '- Finishing ... ')
+  call append(3, '- Finishing ... ') | 4
   redraw
   call plug#helptags()
   call plug#end()
@@ -698,12 +867,14 @@ 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()
   if empty(s:update.errors)
     return
   endif
+  echo
   call s:update_impl(s:update.pull, s:update.force,
         \ extend(copy(s:update.errors), [s:update.threads]))
 endfunction
@@ -716,20 +887,28 @@ function! s:names(...)
   return sort(filter(keys(g:plugs), 'stridx(v:val, a:1) == 0 && s:is_managed(v:val)'))
 endfunction
 
+function! s:check_ruby()
+  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
+  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
   let args = copy(a:args)
   let threads = (len(args) > 0 && args[-1] =~ '^[1-9][0-9]*$') ?
-                  \ remove(args, -1) : get(g:, 'plug_threads', s:is_win ? 1 : 16)
+                  \ remove(args, -1) : get(g:, 'plug_threads', 16)
 
   let managed = filter(copy(g:plugs), 's:is_managed(v:key)')
   let todo = empty(args) ? filter(managed, '!v:val.frozen || !isdirectory(v:val.dir)') :
                          \ filter(managed, 'index(args, v:key) >= 0')
 
   if empty(todo)
-    echohl WarningMsg
-    echo 'No plugin to '. (a:pull ? 'update' : 'install') . '.'
-    echohl None
-    return
+    return s:warn('echo', 'No plugin to '. (a:pull ? 'update' : 'install'))
   endif
 
   if !s:is_win && s:git_version_requirement(2, 3)
@@ -751,14 +930,11 @@ function! s:update_impl(pull, force, args) abort
   endif
 
   if has('nvim') && !exists('*jobwait') && threads > 1
-    echohl WarningMsg
-    echomsg 'vim-plug: update Neovim for parallel installer'
-    echohl None
+    call s:warn('echom', '[vim-plug] Update Neovim for parallel installer')
   endif
 
-  let python = (has('python') || has('python3')) && !s:is_win && !has('win32unix')
-      \ && (!s:nvim || has('vim_starting'))
-  let ruby = has('ruby') && !s:nvim && (v:version >= 703 || v:version == 702 && has('patch374'))
+  let python = (has('python') || has('python3')) && (!s:nvim || has('vim_starting'))
+  let ruby = has('ruby') && !s:nvim && (v:version >= 703 || v:version == 702 && has('patch374')) && !(s:is_win && has('gui_running')) && s:check_ruby()
 
   let s:update = {
     \ 'start':   reltime(),
@@ -773,7 +949,7 @@ function! s:update_impl(pull, force, args) abort
     \ 'fin':     0
   \ }
 
-  call s:prepare()
+  call s:prepare(1)
   call append(0, ['', ''])
   normal! 2G
   silent! redraw
@@ -784,7 +960,7 @@ 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])
@@ -826,12 +1002,61 @@ function! s:update_impl(pull, force, args) abort
   endif
 endfunction
 
+function! s:log4(name, msg)
+  call setline(4, printf('- %s (%s)', a:msg, a:name))
+  redraw
+endfunction
+
 function! s:update_finish()
   if exists('s:git_terminal_prompt')
     let $GIT_TERMINAL_PROMPT = s:git_terminal_prompt
   endif
   if s:switch_in()
-    call s:do(s:update.pull, s:update.force, filter(copy(s:update.all), 'has_key(v:val, "do")'))
+    call append(3, '- Updating ...') | 4
+    for [name, spec] in items(filter(copy(s:update.all), 'index(s:update.errors, v:key) < 0 && (s:update.force || s:update.pull || has_key(s:update.new, v:key))'))
+      let pos = s:logpos(name)
+      if !pos
+        continue
+      endif
+      if has_key(spec, 'commit')
+        call s:log4(name, 'Checking out '.spec.commit)
+        let out = s:checkout(spec)
+      elseif has_key(spec, 'tag')
+        let tag = spec.tag
+        if tag =~ '\*'
+          let tags = s:lines(s:system('git tag --list '.string(tag).' --sort -version:refname 2>&1', spec.dir))
+          if !v:shell_error && !empty(tags)
+            let tag = tags[0]
+            call s:log4(name, printf('Latest tag for %s -> %s', spec.tag, tag))
+            call append(3, '')
+          endif
+        endif
+        call s:log4(name, 'Checking out '.tag)
+        let out = s:system('git checkout -q '.s:esc(tag).' 2>&1', spec.dir)
+      else
+        let branch = s:esc(get(spec, 'branch', 'master'))
+        call s:log4(name, 'Merging origin/'.branch)
+        let out = s:system('git checkout -q '.branch.' 2>&1'
+              \. (has_key(s:update.new, name) ? '' : ('&& git merge --ff-only origin/'.branch.' 2>&1')), spec.dir)
+      endif
+      if !v:shell_error && filereadable(spec.dir.'/.gitmodules') &&
+            \ (s:update.force || has_key(s:update.new, name) || s:is_updated(spec.dir))
+        call s:log4(name, 'Updating submodules. This may take a while.')
+        let out .= s:bang('git submodule update --init --recursive 2>&1', spec.dir)
+      endif
+      let msg = s:format_message(v:shell_error ? 'x': '-', name, out)
+      if v:shell_error
+        call add(s:update.errors, name)
+        call s:regress_bar()
+        silent execute pos 'd _'
+        call append(4, msg) | 4
+      elseif !empty(out)
+        call setline(pos, msg[0])
+      endif
+      redraw
+    endfor
+    silent 4 d _
+    call s:do(s:update.pull, s:update.force, filter(copy(s:update.all), 'index(s:update.errors, v:key) < 0 && has_key(v:val, "do")'))
     call s:finish(s:update.pull)
     call setline(1, 'Updated. Elapsed time: ' . split(reltimestr(reltime(s:update.start)))[0] . ' sec.')
     call s:switch_out('normal! gg')
@@ -860,7 +1085,13 @@ function! s:job_handler(job_id, data, event) abort
   endif
 
   if a:event == 'stdout'
-    let self.result .= substitute(s:to_s(a:data), '[\r\n]', '', 'g') . "\n"
+    let complete = empty(a:data[-1])
+    let lines = map(filter(a:data, 'len(v:val) > 0'), 'split(v:val, "[\r\n]")[-1]')
+    call extend(self.lines, lines)
+    let self.result = join(self.lines, "\n")
+    if !complete
+      call remove(self.lines, -1)
+    endif
     " To reduce the number of buffer updates
     let self.tick = get(self, 'tick', -1) + 1
     if self.tick % len(s:jobs) == 0
@@ -877,7 +1108,7 @@ function! s:job_handler(job_id, data, event) abort
 endfunction
 
 function! s:spawn(name, cmd, opts)
-  let job = { 'name': a:name, 'running': 1, 'error': 0, 'result': '',
+  let job = { 'name': a:name, 'running': 1, 'error': 0, 'lines': [], 'result': '',
             \ 'new': get(a:opts, 'new', 0),
             \ 'on_stdout': function('s:job_handler'),
             \ 'on_exit' : function('s:job_handler'),
@@ -913,7 +1144,7 @@ function! s:reap(name)
   endif
   let s:update.bar .= job.error ? 'x' : '='
 
-  call s:log(job.error ? 'x' : '-', a:name, job.result)
+  call s:log(job.error ? 'x' : '-', a:name, empty(job.result) ? 'OK' : job.result)
   call s:bar()
 
   call remove(s:jobs, a:name)
@@ -930,19 +1161,18 @@ function! s:bar()
 endfunction
 
 function! s:logpos(name)
-  for i in range(1, line('$'))
+  for i in range(4, line('$'))
     if getline(i) =~# '^[-+x*] '.a:name.':'
       return i
     endif
   endfor
-  return 0
 endfunction
 
 function! s:log(bullet, name, lines)
   if s:switch_in()
     let pos = s:logpos(a:name)
     if pos > 0
-      execute pos 'd _'
+      silent execute pos 'd _'
       if pos > winheight('.')
         let pos = 4
       endif
@@ -981,30 +1211,24 @@ while 1 " Without TCO, Vim stack is bound to explode
   redraw
 
   let has_tag = has_key(spec, 'tag')
-  let checkout = s:shellesc(has_tag ? spec.tag : spec.branch)
-  let merge = s:shellesc(has_tag ? spec.tag : 'origin/'.spec.branch)
-
   if !new
-    let [valid, msg] = s:git_valid(spec, 0)
-    if valid
+    let [error, _] = s:git_validate(spec, 0)
+    if empty(error)
       if pull
         let fetch_opt = (has_tag && !empty(globpath(spec.dir, '.git/shallow'))) ? '--depth 99999999' : ''
-        call s:spawn(name,
-          \ printf('(git fetch %s %s 2>&1 && git checkout -q %s 2>&1 && git merge --ff-only %s 2>&1 && git submodule update --init --recursive 2>&1)',
-          \ fetch_opt, prog, checkout, merge), { 'dir': spec.dir })
+        call s:spawn(name, printf('git fetch %s %s 2>&1', fetch_opt, prog), { 'dir': spec.dir })
       else
         let s:jobs[name] = { 'running': 0, 'result': 'Already installed', 'error': 0 }
       endif
     else
-      let s:jobs[name] = { 'running': 0, 'result': msg, 'error': 1 }
+      let s:jobs[name] = { 'running': 0, 'result': error, 'error': 1 }
     endif
   else
     call s:spawn(name,
-          \ printf('git clone %s %s --recursive %s -b %s %s 2>&1',
+          \ printf('git clone %s %s %s %s 2>&1',
           \ has_tag ? '' : s:clone_opt,
           \ prog,
           \ s:shellesc(spec.uri),
-          \ checkout,
           \ s:shellesc(s:trim(spec.dir))), { 'new': 1 })
   endif
 
@@ -1018,9 +1242,8 @@ endwhile
 endfunction
 
 function! s:update_python()
-let py_exe = has('python3') ? 'python3' : 'python'
+let py_exe = has('python') ? 'python' : 'python3'
 execute py_exe "<< EOF"
-""" Due to use of signals this function is POSIX only. """
 import datetime
 import functools
 import os
@@ -1047,33 +1270,29 @@ G_CLONE_OPT = vim.eval('s:clone_opt')
 G_PROGRESS = vim.eval('s:progress_opt(1)')
 G_LOG_PROB = 1.0 / int(vim.eval('s:update.threads'))
 G_STOP = thr.Event()
-G_THREADS = {}
+G_IS_WIN = vim.eval('s:is_win') == '1'
 
-class BaseExc(Exception):
+class PlugError(Exception):
   def __init__(self, msg):
-    self._msg = msg
-  @property
-  def msg(self):
-    return self._msg
-class CmdTimedOut(BaseExc):
+    self.msg = msg
+class CmdTimedOut(PlugError):
   pass
-class CmdFailed(BaseExc):
+class CmdFailed(PlugError):
   pass
-class InvalidURI(BaseExc):
+class InvalidURI(PlugError):
   pass
 class Action(object):
   INSTALL, UPDATE, ERROR, DONE = ['+', '*', 'x', '-']
 
 class Buffer(object):
-  def __init__(self, lock, num_plugs, is_pull, is_win):
+  def __init__(self, lock, num_plugs, is_pull):
     self.bar = ''
     self.event = 'Updating' if is_pull else 'Installing'
-    self.is_win = is_win
     self.lock = lock
     self.maxy = int(vim.eval('winheight(".")'))
     self.num_plugs = num_plugs
 
-  def _where(self, name):
+  def __where(self, name):
     """ Find first line with name in current buffer. Return line num. """
     found, lnum = False, 0
     matcher = re.compile('^[-+x*] {0}:'.format(name))
@@ -1096,14 +1315,12 @@ class Buffer(object):
 
     with self.lock:
       vim.command('normal! 2G')
-      if not self.is_win:
-        vim.command('redraw')
+      vim.command('redraw')
 
   def write(self, action, name, lines):
     first, rest = lines[0], lines[1:]
     msg = ['{0} {1}{2}{3}'.format(action, name, ': ' if first else '', first)]
-    padded_rest = ['    ' + line for line in rest]
-    msg.extend(padded_rest)
+    msg.extend(['    ' + line for line in rest])
 
     try:
       if action == Action.ERROR:
@@ -1113,7 +1330,7 @@ class Buffer(object):
         self.bar += '='
 
       curbuf = vim.current.buffer
-      lnum = self._where(name)
+      lnum = self.__where(name)
       if lnum != -1: # Found matching line num
         del curbuf[lnum]
         if lnum > self.maxy and action in set([Action.INSTALL, Action.UPDATE]):
@@ -1127,62 +1344,84 @@ class Buffer(object):
       pass
 
 class Command(object):
-  def __init__(self, cmd, cmd_dir=None, timeout=60, ntries=3, cb=None, clean=None):
+  CD = 'cd /d' if G_IS_WIN else 'cd'
+
+  def __init__(self, cmd, cmd_dir=None, timeout=60, cb=None, clean=None):
     self.cmd = cmd
-    self.cmd_dir = cmd_dir
+    if cmd_dir:
+      self.cmd = '{0} {1} && {2}'.format(Command.CD, cmd_dir, self.cmd)
     self.timeout = timeout
-    self.ntries = ntries
     self.callback = cb if cb else (lambda msg: None)
-    self.clean = clean
+    self.clean = clean if clean else (lambda: None)
+    self.proc = None
 
-  def attempt_cmd(self):
-    """ Tries to run the command, returns result if no exceptions. """
-    attempt = 0
-    finished = False
-    limit = self.timeout
+  @property
+  def alive(self):
+    """ Returns true only if command still running. """
+    return self.proc and self.proc.poll() is None
+
+  def execute(self, ntries=3):
+    """ Execute the command with ntries if CmdTimedOut.
+        Returns the output of the command if no Exception.
+    """
+    attempt, finished, limit = 0, False, self.timeout
 
     while not finished:
       try:
         attempt += 1
-        result = self.timeout_cmd()
+        result = self.try_command()
         finished = True
+        return result
       except CmdTimedOut:
-        if attempt != self.ntries:
-          for count in range(3, 0, -1):
-            if G_STOP.is_set():
-              raise KeyboardInterrupt
-            msg = 'Timeout. Will retry in {0} second{1} ...'.format(
-                count, 's' if count != 1 else '')
-            self.callback([msg])
-            time.sleep(1)
+        if attempt != ntries:
+          self.notify_retry()
           self.timeout += limit
-          self.callback(['Retrying ...'])
         else:
           raise
 
-    return result
-
-  def timeout_cmd(self):
+  def notify_retry(self):
+    """ Retry required for command, notify user. """
+    for count in range(3, 0, -1):
+      if G_STOP.is_set():
+        raise KeyboardInterrupt
+      msg = 'Timeout. Will retry in {0} second{1} ...'.format(
+            count, 's' if count != 1 else '')
+      self.callback([msg])
+      time.sleep(1)
+    self.callback(['Retrying ...'])
+
+  def try_command(self):
     """ Execute a cmd & poll for callback. Returns list of output.
-    Raises CmdFailed   -> return code for Popen isn't 0
-    Raises CmdTimedOut -> command exceeded timeout without new output
+        Raises CmdFailed   -> return code for Popen isn't 0
+        Raises CmdTimedOut -> command exceeded timeout without new output
     """
-    proc = None
     first_line = True
+
     try:
-      tfile = tempfile.NamedTemporaryFile(mode='w+b', delete=False)
-      proc = subprocess.Popen(self.cmd, cwd=self.cmd_dir, stdout=tfile,
-          stderr=subprocess.STDOUT, shell=True, preexec_fn=os.setsid)
-      while proc.poll() is None:
-        # Yield this thread
-        time.sleep(0.2)
+      tfile = tempfile.NamedTemporaryFile(mode='w+b')
+      preexec_fn = not G_IS_WIN and os.setsid or None
+      self.proc = subprocess.Popen(self.cmd, stdout=tfile,
+                                   stderr=subprocess.STDOUT,
+                                   stdin=subprocess.PIPE, shell=True,
+                                   preexec_fn=preexec_fn)
+      thrd = thr.Thread(target=(lambda proc: proc.wait()), args=(self.proc,))
+      thrd.start()
+
+      thread_not_started = True
+      while thread_not_started:
+        try:
+          thrd.join(0.1)
+          thread_not_started = False
+        except RuntimeError:
+          pass
 
+      while self.alive:
         if G_STOP.is_set():
           raise KeyboardInterrupt
 
         if first_line or random.random() < G_LOG_PROB:
           first_line = False
-          line = nonblock_read(tfile.name)
+          line = '' if G_IS_WIN else nonblock_read(tfile.name)
           if line:
             self.callback([line])
 
@@ -1190,23 +1429,27 @@ class Command(object):
         if time_diff > self.timeout:
           raise CmdTimedOut(['Timeout!'])
 
+        thrd.join(0.5)
+
       tfile.seek(0)
-      result = [line.decode().rstrip() for line in tfile]
+      result = [line.decode('utf-8', 'replace').rstrip() for line in tfile]
+
+      if self.proc.returncode != 0:
+        raise CmdFailed([''] + result)
 
-      if proc.returncode != 0:
-        msg = ['']
-        msg.extend(result)
-        raise CmdFailed(msg)
+      return result
     except:
-      if proc and proc.poll() is None:
-        os.killpg(proc.pid, signal.SIGTERM)
-      if self.clean:
-        self.clean()
+      self.terminate()
       raise
-    finally:
-      os.remove(tfile.name)
 
-    return result
+  def terminate(self):
+    """ Terminate process and cleanup. """
+    if self.alive:
+      if G_IS_WIN:
+        os.kill(self.proc.pid, signal.SIGINT)
+      else:
+        os.killpg(self.proc.pid, signal.SIGTERM)
+    self.clean()
 
 class Plugin(object):
   def __init__(self, name, args, buf_q, lock):
@@ -1214,10 +1457,7 @@ class Plugin(object):
     self.args = args
     self.buf_q = buf_q
     self.lock = lock
-    tag = args.get('tag', 0)
-    self.checkout = esc(tag if tag else args['branch'])
-    self.merge = esc(tag if tag else 'origin/' + args['branch'])
-    self.tag = tag
+    self.tag = args.get('tag', 0)
 
   def manage(self):
     try:
@@ -1227,7 +1467,7 @@ class Plugin(object):
         self.install()
         with self.lock:
           thread_vim_command("let s:update.new['{0}'] = 1".format(self.name))
-    except (CmdTimedOut, CmdFailed, InvalidURI) as exc:
+    except PlugError as exc:
       self.write(Action.ERROR, self.name, exc.msg)
     except KeyboardInterrupt:
       G_STOP.set()
@@ -1240,6 +1480,8 @@ class Plugin(object):
 
   def install(self):
     target = self.args['dir']
+    if target[-1] == '\\':
+      target = target[0:-1]
 
     def clean(target):
       def _clean():
@@ -1251,12 +1493,19 @@ class Plugin(object):
 
     self.write(Action.INSTALL, self.name, ['Installing ...'])
     callback = functools.partial(self.write, Action.INSTALL, self.name)
-    cmd = 'git clone {0} {1} --recursive {2} -b {3} {4} 2>&1'.format(
-        '' if self.tag else G_CLONE_OPT, G_PROGRESS, self.args['uri'], self.checkout, esc(target))
-    com = Command(cmd, None, G_TIMEOUT, G_RETRIES, callback, clean(target))
-    result = com.attempt_cmd()
+    cmd = 'git clone {0} {1} {2} {3} 2>&1'.format(
+          '' if self.tag else G_CLONE_OPT, G_PROGRESS, self.args['uri'],
+          esc(target))
+    com = Command(cmd, None, G_TIMEOUT, callback, clean(target))
+    result = com.execute(G_RETRIES)
     self.write(Action.DONE, self.name, result[-1:])
 
+  def repo_uri(self):
+    cmd = 'git rev-parse --abbrev-ref HEAD 2>&1 && git config -f .git/config remote.origin.url'
+    command = Command(cmd, self.args['dir'], G_TIMEOUT,)
+    result = command.execute(G_RETRIES)
+    return result[-1]
+
   def update(self):
     match = re.compile(r'git::?@')
     actual_uri = re.sub(match, '', self.repo_uri())
@@ -1272,23 +1521,13 @@ class Plugin(object):
       self.write(Action.UPDATE, self.name, ['Updating ...'])
       callback = functools.partial(self.write, Action.UPDATE, self.name)
       fetch_opt = '--depth 99999999' if self.tag and os.path.isfile(os.path.join(self.args['dir'], '.git/shallow')) else ''
-      cmds = ['git fetch {0} {1}'.format(fetch_opt, G_PROGRESS),
-              'git checkout -q {0}'.format(self.checkout),
-              'git merge --ff-only {0}'.format(self.merge),
-              'git submodule update --init --recursive']
-      cmd = ' 2>&1 && '.join(cmds)
-      com = Command(cmd, self.args['dir'], G_TIMEOUT, G_RETRIES, callback)
-      result = com.attempt_cmd()
+      cmd = 'git fetch {0} {1} 2>&1'.format(fetch_opt, G_PROGRESS)
+      com = Command(cmd, self.args['dir'], G_TIMEOUT, callback)
+      result = com.execute(G_RETRIES)
       self.write(Action.DONE, self.name, result[-1:])
     else:
       self.write(Action.DONE, self.name, ['Already installed'])
 
-  def repo_uri(self):
-    cmd = 'git rev-parse --abbrev-ref HEAD 2>&1 && git config remote.origin.url'
-    command = Command(cmd, self.args['dir'], G_TIMEOUT, G_RETRIES)
-    result = command.attempt_cmd()
-    return result[-1]
-
   def write(self, action, name, msg):
     self.buf_q.put((action, name, msg))
 
@@ -1310,10 +1549,6 @@ class PlugThread(thr.Thread):
         work_q.task_done()
     except queue.Empty:
       pass
-    finally:
-      global G_THREADS
-      with lock:
-        del G_THREADS[thr.current_thread().name]
 
 class RefreshThread(thr.Thread):
   def __init__(self, lock):
@@ -1325,7 +1560,7 @@ class RefreshThread(thr.Thread):
     while self.running:
       with self.lock:
         thread_vim_command('noautocmd normal! a')
-      time.sleep(0.2)
+      time.sleep(0.33)
 
   def stop(self):
     self.running = False
@@ -1343,7 +1578,7 @@ def esc(name):
 def nonblock_read(fname):
   """ Read a file with nonblock flag. Return the last line. """
   fread = os.open(fname, os.O_RDONLY | os.O_NONBLOCK)
-  buf = os.read(fread, 100000).decode()
+  buf = os.read(fread, 100000).decode('utf-8', 'replace')
   os.close(fread)
 
   line = buf.rstrip('\r\n')
@@ -1359,28 +1594,26 @@ def main():
   nthreads = int(vim.eval('s:update.threads'))
   plugs = vim.eval('s:update.todo')
   mac_gui = vim.eval('s:mac_gui') == '1'
-  is_win = vim.eval('s:is_win') == '1'
 
   lock = thr.Lock()
-  buf = Buffer(lock, len(plugs), G_PULL, is_win)
+  buf = Buffer(lock, len(plugs), G_PULL)
   buf_q, work_q = queue.Queue(), queue.Queue()
   for work in plugs.items():
     work_q.put(work)
 
-  global G_THREADS
+  start_cnt = thr.active_count()
   for num in range(nthreads):
     tname = 'PlugT-{0:02}'.format(num)
     thread = PlugThread(tname, (buf_q, work_q, lock))
     thread.start()
-    G_THREADS[tname] = thread
   if mac_gui:
     rthread = RefreshThread(lock)
     rthread.start()
 
-  while not buf_q.empty() or len(G_THREADS) != 0:
+  while not buf_q.empty() or thr.active_count() != start_cnt:
     try:
       action, name, msg = buf_q.get(True, 0.25)
-      buf.write(action, name, msg)
+      buf.write(action, name, ['OK'] if not msg else msg)
       buf_q.task_done()
     except queue.Empty:
       pass
@@ -1420,16 +1653,20 @@ function! s:update_ruby()
 
   def killall pid
     pids = [pid]
-    unless `which pgrep 2> /dev/null`.empty?
-      children = pids
-      until children.empty?
-        children = children.map { |pid|
-          `pgrep -P #{pid}`.lines.map { |l| l.chomp }
-        }.flatten
-        pids += children
+    if /mswin|mingw|bccwin/ =~ RUBY_PLATFORM
+      pids.each { |pid| Process.kill 'INT', pid.to_i rescue nil }
+    else
+      unless `which pgrep 2> /dev/null`.empty?
+        children = pids
+        until children.empty?
+          children = children.map { |pid|
+            `pgrep -P #{pid}`.lines.map { |l| l.chomp }
+          }.flatten
+          pids += children
+        end
       end
+      pids.each { |pid| Process.kill 'TERM', pid.to_i rescue nil }
     end
-    pids.each { |pid| Process.kill 'TERM', pid.to_i rescue nil }
   end
 
   require 'thread'
@@ -1455,7 +1692,7 @@ function! s:update_ruby()
     $curbuf[1] = "#{pull ? 'Updating' : 'Installing'} plugins (#{cnt}/#{tot})"
     $curbuf[2] = '[' + bar.ljust(tot) + ']'
     VIM::command('normal! 2G')
-    VIM::command('redraw') unless iswin
+    VIM::command('redraw')
   }
   where = proc { |name| (1..($curbuf.length)).find { |l| $curbuf[l] =~ /^[-+x*] #{name}:/ } }
   log   = proc { |name, result, type|
@@ -1470,7 +1707,7 @@ function! s:update_ruby()
           end
       result =
         if type || type.nil?
-          ["#{b} #{name}: #{result.lines.to_a.last}"]
+          ["#{b} #{name}: #{result.lines.to_a.last || 'OK'}"]
         elsif result =~ /^Interrupted|^Timeout/
           ["#{b} #{name}: #{result}"]
         else
@@ -1560,15 +1797,12 @@ function! s:update_ruby()
       threads << Thread.new {
         while pair = take1.call
           name = pair.first
-          dir, uri, branch, tag = pair.last.values_at *%w[dir uri branch tag]
-          checkout = esc(tag ? tag : branch)
-          merge = esc(tag ? tag : "origin/#{branch}")
-          subm = "git submodule update --init --recursive 2>&1"
+          dir, uri, tag = pair.last.values_at *%w[dir uri tag]
           exists = File.directory? dir
           ok, result =
             if exists
-              dir = iswin ? dir : esc(dir)
-              ret, data = bt.call "#{cd} #{dir} && git rev-parse --abbrev-ref HEAD 2>&1 && git config remote.origin.url", nil, nil, nil
+              chdir = "#{cd} #{iswin ? dir : esc(dir)}"
+              ret, data = bt.call "#{chdir} && git rev-parse --abbrev-ref HEAD 2>&1 && git config -f .git/config remote.origin.url", nil, nil, nil
               current_uri = data.lines.to_a.last
               if !ret
                 if data =~ /^Interrupted|^Timeout/
@@ -1584,7 +1818,7 @@ function! s:update_ruby()
                 if pull
                   log.call name, 'Updating ...', :update
                   fetch_opt = (tag && File.exist?(File.join(dir, '.git/shallow'))) ? '--depth 99999999' : ''
-                  bt.call "#{cd} #{dir} && git fetch #{fetch_opt} #{progress} 2>&1 && git checkout -q #{checkout} 2>&1 && git merge --ff-only #{merge} 2>&1 && #{subm}", name, :update, nil
+                  bt.call "#{chdir} && git fetch #{fetch_opt} #{progress} 2>&1", name, :update, nil
                 else
                   [true, skip]
                 end
@@ -1592,7 +1826,7 @@ function! s:update_ruby()
             else
               d = esc dir.sub(%r{[\\/]+$}, '')
               log.call name, 'Installing ...', :install
-              bt.call "git clone #{clone_opt unless tag} #{progress} --recursive #{uri} -b #{checkout} #{d} 2>&1", name, :install, proc {
+              bt.call "git clone #{clone_opt unless tag} #{progress} #{uri} #{d} 2>&1", name, :install, proc {
                 FileUtils.rm_rf dir
               }
             end
@@ -1614,7 +1848,7 @@ function! s:shellesc(arg)
 endfunction
 
 function! s:glob_dir(path)
-  return map(filter(s:lines(globpath(a:path, '**')), 'isdirectory(v:val)'), 's:dirpath(v:val)')
+  return map(filter(s:glob(a:path, '**'), 'isdirectory(v:val)'), 's:dirpath(v:val)')
 endfunction
 
 function! s:progress_bar(line, bar, total)
@@ -1642,10 +1876,7 @@ 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
@@ -1658,42 +1889,53 @@ function! s:system_chomp(...)
   return v:shell_error ? '' : substitute(ret, '\n$', '', '')
 endfunction
 
-function! s:git_valid(spec, check_branch)
-  let ret = 1
-  let msg = 'OK'
+function! s:git_validate(spec, check_branch)
+  let err = ''
   if isdirectory(a:spec.dir)
-    let result = s:lines(s:system('git rev-parse --abbrev-ref HEAD 2>&1 && git config remote.origin.url', a:spec.dir))
+    let result = s:lines(s:system('git rev-parse --abbrev-ref HEAD 2>&1 && git config -f .git/config remote.origin.url', a:spec.dir))
     let remote = result[-1]
     if v:shell_error
-      let msg = join([remote, 'PlugClean required.'], "\n")
-      let ret = 0
+      let err = join([remote, 'PlugClean required.'], "\n")
     elseif !s:compare_git_uri(remote, a:spec.uri)
-      let msg = join(['Invalid URI: '.remote,
+      let err = join(['Invalid URI: '.remote,
                     \ 'Expected:    '.a:spec.uri,
                     \ 'PlugClean required.'], "\n")
-      let ret = 0
+    elseif a:check_branch && has_key(a:spec, 'commit')
+      let result = s:lines(s:system('git rev-parse HEAD 2>&1', a:spec.dir))
+      let sha = result[-1]
+      if v:shell_error
+        let err = join(add(result, 'PlugClean required.'), "\n")
+      elseif !s:hash_match(sha, a:spec.commit)
+        let err = join([printf('Invalid HEAD (expected: %s, actual: %s)',
+                              \ a:spec.commit[:6], sha[:6]),
+                      \ 'PlugUpdate required.'], "\n")
+      endif
     elseif a:check_branch
       let branch = result[0]
       " Check tag
       if has_key(a:spec, 'tag')
         let tag = s:system_chomp('git describe --exact-match --tags HEAD 2>&1', a:spec.dir)
         if a:spec.tag !=# tag
-          let msg = printf('Invalid tag: %s (expected: %s). Try PlugUpdate.',
+          let err = printf('Invalid tag: %s (expected: %s). Try PlugUpdate.',
                 \ (empty(tag) ? 'N/A' : tag), a:spec.tag)
-          let ret = 0
         endif
       " Check branch
       elseif a:spec.branch !=# branch
-        let msg = printf('Invalid branch: %s (expected: %s). Try PlugUpdate.',
+        let err = printf('Invalid branch: %s (expected: %s). Try PlugUpdate.',
               \ branch, a:spec.branch)
-        let ret = 0
+      endif
+      if empty(err)
+        let commits = len(s:lines(s:system(printf('git rev-list origin/%s..HEAD', a:spec.branch), a:spec.dir)))
+        if !v:shell_error && commits
+          let err = join([printf('Diverged from origin/%s by %d commit(s).', a:spec.branch, commits),
+                        \ 'Reinstall after PlugClean.'], "\n")
+        endif
       endif
     endif
   else
-    let msg = 'Not found'
-    let ret = 0
+    let err = 'Not found'
   endif
-  return [ret, msg]
+  return [err, err =~# 'PlugClean']
 endfunction
 
 function! s:rm_rf(dir)
@@ -1704,15 +1946,23 @@ endfunction
 
 function! s:clean(force)
   call s:prepare()
-  call append(0, 'Searching for unused plugins in '.g:plug_home)
+  call append(0, 'Searching for invalid plugins in '.g:plug_home)
   call append(1, '')
 
   " List of valid directories
   let dirs = []
+  let errs = {}
   let [cnt, total] = [0, len(g:plugs)]
   for [name, spec] in items(g:plugs)
-    if !s:is_managed(name) || s:git_valid(spec, 0)[0]
+    if !s:is_managed(name)
       call add(dirs, spec.dir)
+    else
+      let [err, clean] = s:git_validate(spec, 1)
+      if clean
+        let errs[spec.dir] = s:lines(err)[0]
+      else
+        call add(dirs, spec.dir)
+      endif
     endif
     let cnt += 1
     call s:progress_bar(2, repeat('=', cnt), total)
@@ -1736,28 +1986,60 @@ function! s:clean(force)
     if !has_key(allowed, f) && isdirectory(f)
       call add(todo, f)
       call append(line('$'), '- ' . f)
+      if has_key(errs, f)
+        call append(line('$'), '    ' . errs[f])
+      endif
       let found = filter(found, 'stridx(v:val, f) != 0')
     end
   endwhile
 
-  normal! G
+  4
   redraw
   if empty(todo)
     call append(line('$'), 'Already clean.')
   else
-    call inputsave()
-    let yes = a:force || (input('Proceed? (y/N) ') =~? '^y')
-    call inputrestore()
-    if yes
-      for dir in todo
-        call s:rm_rf(dir)
-      endfor
-      call append(line('$'), 'Removed.')
+    let s:clean_count = 0
+    call append(3, ['Directories to delete:', ''])
+    redraw!
+    if a:force || s:ask_no_interrupt('Delete all directories?')
+      call s:delete([6, line('$')], 1)
     else
-      call append(line('$'), 'Cancelled.')
+      call setline(4, 'Cancelled.')
+      nnoremap <silent> <buffer> d :set opfunc=<sid>delete_op<cr>g@
+      nmap     <silent> <buffer> dd d_
+      xnoremap <silent> <buffer> d :<c-u>call <sid>delete_op(visualmode(), 1)<cr>
+      echo 'Delete the lines (d{motion}) to delete the corresponding directories'
     endif
   endif
-  normal! G
+  4
+  setlocal nomodifiable
+endfunction
+
+function! s:delete_op(type, ...)
+  call s:delete(a:0 ? [line("'<"), line("'>")] : [line("'["), line("']")], 0)
+endfunction
+
+function! s:delete(range, force)
+  let [l1, l2] = a:range
+  let force = a:force
+  while l1 <= l2
+    let line = getline(l1)
+    if line =~ '^- ' && isdirectory(line[2:])
+      execute l1
+      redraw!
+      let answer = force ? 1 : s:ask('Delete '.line[2:].'?', 1)
+      let force = force || answer > 1
+      if answer
+        call s:rm_rf(line[2:])
+        setlocal modifiable
+        call setline(l1, '~'.line[1:])
+        let s:clean_count += 1
+        call setline(4, printf('Removed %d directories.', s:clean_count))
+        setlocal nomodifiable
+      endif
+    endif
+    let l1 += 1
+  endwhile
 endfunction
 
 function! s:upgrade()
@@ -1804,7 +2086,8 @@ function! s:status()
   for [name, spec] in items(g:plugs)
     if has_key(spec, 'uri')
       if isdirectory(spec.dir)
-        let [valid, msg] = s:git_valid(spec, 1)
+        let [err, _] = s:git_validate(spec, 1)
+        let [valid, msg] = [empty(err), empty(err) ? 'OK' : err]
       else
         let [valid, msg] = [0, 'Not found. Try PlugInstall.']
       endif
@@ -1867,7 +2150,6 @@ function! s:is_preview_window_open()
     wincmd p
     return 1
   endif
-  return 0
 endfunction
 
 function! s:find_name(lnum)
@@ -1889,7 +2171,7 @@ function! s:preview_commit()
     let b:plug_preview = !s:is_preview_window_open()
   endif
 
-  let sha = matchstr(getline('.'), '\(^  \)\@<=[0-9a-z]\{7}')
+  let sha = matchstr(getline('.'), '^  \X*\zs[0-9a-f]\{7}')
   if empty(sha)
     return
   endif
@@ -1899,11 +2181,15 @@ function! s:preview_commit()
     return
   endif
 
-  execute 'pedit' sha
-  wincmd P
-  setlocal filetype=git buftype=nofile nobuflisted modifiable
-  execute 'silent read !cd' s:shellesc(g:plugs[name].dir) '&& git show --pretty=medium' sha
-  normal! gg"_dd
+  if exists('g:plug_pwindow') && !s:is_preview_window_open()
+    execute g:plug_pwindow
+    execute 'e' sha
+  else
+    execute 'pedit' sha
+    wincmd P
+  endif
+  setlocal previewwindow filetype=git buftype=nofile nobuflisted modifiable
+  execute 'silent %!cd' s:shellesc(g:plugs[name].dir) '&& git show --no-color --pretty=medium' sha
   setlocal nomodifiable
   nnoremap <silent> <buffer> q :q<cr>
   wincmd p
@@ -1913,41 +2199,72 @@ function! s:section(flags)
   call search('\(^[x-] \)\@<=[^:]\+:', a:flags)
 endfunction
 
+function! s:format_git_log(line)
+  let indent = '  '
+  let tokens = split(a:line, nr2char(1))
+  if len(tokens) != 5
+    return indent.substitute(a:line, '\s*$', '', '')
+  endif
+  let [graph, sha, refs, subject, date] = tokens
+  let tag = matchstr(refs, 'tag: [^,)]\+')
+  let tag = empty(tag) ? ' ' : ' ('.tag.') '
+  return printf('%s%s%s%s%s (%s)', indent, graph, sha, tag, subject, date)
+endfunction
+
+function! s:append_ul(lnum, text)
+  call append(a:lnum, ['', a:text, repeat('-', len(a:text))])
+endfunction
+
 function! s:diff()
   call s:prepare()
-  call append(0, 'Collecting updated changes ...')
-  normal! gg
-  redraw
-
-  let cnt = 0
-  for [k, v] in items(g:plugs)
-    if !isdirectory(v.dir) || !s:is_managed(k)
+  call append(0, ['Collecting changes ...', ''])
+  let cnts = [0, 0]
+  let bar = ''
+  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
-
-    let diff = s:system_chomp('git log --pretty=format:"%h %s (%cr)" "HEAD...HEAD@{1}"', v.dir)
-    if !empty(diff)
-      call append(1, '')
-      call append(2, '- '.k.':')
-      call append(3, map(s:lines(diff), '"  ". v:val'))
-      let cnt += 1
-      normal! gg
+    call s:append_ul(2, origin ? 'Pending updates:' : 'Last update:')
+    for [k, v] in plugs
+      let range = origin ? '..origin/'.v.branch : 'HEAD@{1}..'
+      let diff = s:system_chomp('git log --graph --color=never --pretty=format:"%x01%h%x01%d%x01%s%x01%cr" '.s:shellesc(range), v.dir)
+      if !empty(diff)
+        let ref = has_key(v, 'tag') ? (' (tag: '.v.tag.')') : has_key(v, 'commit') ? (' '.v.commit) : ''
+        call append(5, extend(['', '- '.k.':'.ref], map(s:lines(diff), 's:format_git_log(v:val)')))
+        let cnts[origin] += 1
+      endif
+      let bar .= '='
+      call s:progress_bar(2, bar, len(total))
+      normal! 2G
       redraw
+    endfor
+    if !cnts[origin]
+      call append(5, ['', 'N/A'])
     endif
   endfor
+  call setline(1, printf('%d plugin(s) updated.', cnts[0])
+        \ . (cnts[1] ? printf(' %d plugin(s) have pending updates.', cnts[1]) : ''))
 
-  call setline(1, cnt == 0 ? 'No updates.' : 'Last update:')
-  nnoremap <silent> <buffer> <cr> :silent! call <SID>preview_commit()<cr>
-  nnoremap <silent> <buffer> o    :silent! call <SID>preview_commit()<cr>
-  nnoremap <silent> <buffer> X    :call <SID>revert()<cr>
-  normal! gg
-  setlocal nomodifiable
-  if cnt > 0
+  if cnts[0] || cnts[1]
+    nnoremap <silent> <buffer> <cr> :silent! call <SID>preview_commit()<cr>
+    nnoremap <silent> <buffer> o    :silent! call <SID>preview_commit()<cr>
+  endif
+  if cnts[0]
+    nnoremap <silent> <buffer> X :call <SID>revert()<cr>
     echo "Press 'X' on each block to revert the update"
   endif
+  normal! gg
+  setlocal nomodifiable
 endfunction
 
 function! s:revert()
+  if search('^Pending updates', 'bnW')
+    return
+  endif
+
   let name = s:find_name(line('.'))
   if empty(name) || !has_key(g:plugs, name) ||
     \ input(printf('Revert the update of %s? (y/N) ', name)) !~? '^y'
@@ -1958,45 +2275,38 @@ function! s:revert()
   setlocal modifiable
   normal! "_dap
   setlocal nomodifiable
-  echo 'Reverted.'
+  echo 'Reverted'
 endfunction
 
-function! s:snapshot(...) abort
-  let home = get(s:, 'plug_home_org', g:plug_home)
-  let [type, var, header] = s:is_win ?
-    \ ['dosbatch', '%PLUG_HOME%',
-    \   ['@echo off', ':: Generated by vim-plug', ':: '.strftime("%c"), '',
-    \    ':: Make sure to PlugUpdate first', '', 'set PLUG_HOME='.home]] :
-    \ ['sh', '$PLUG_HOME',
-    \   ['#!/bin/sh',  '# Generated by vim-plug', '# '.strftime("%c"), '',
-    \    'vim +PlugUpdate +qa', '', 'PLUG_HOME='.s:esc(home)]]
-
+function! s:snapshot(force, ...) abort
   call s:prepare()
-  execute 'setf' type
-  call append(0, header)
-  call append('$', '')
+  setf vim
+  call append(0, ['" Generated by vim-plug',
+                \ '" '.strftime("%c"),
+                \ '" :source this file in vim to restore the snapshot',
+                \ '" or execute: vim -S snapshot.vim',
+                \ '', '', 'PlugUpdate!'])
   1
-  redraw
-
-  let dirs = sort(map(values(filter(copy(g:plugs),
-        \'has_key(v:val, "uri") && isdirectory(v:val.dir)')), 'v:val.dir'))
-  let anchor = line('$') - 1
-  for dir in reverse(dirs)
-    let sha = s:system_chomp('git rev-parse --short HEAD', dir)
+  let anchor = line('$') - 3
+  let names = sort(keys(filter(copy(g:plugs),
+        \'has_key(v:val, "uri") && !has_key(v:val, "commit") && isdirectory(v:val.dir)')))
+  for name in reverse(names)
+    let sha = s:system_chomp('git rev-parse --short HEAD', g:plugs[name].dir)
     if !empty(sha)
-      call append(anchor, printf('cd %s && git reset --hard %s',
-            \ substitute(dir, '^\V'.escape(g:plug_home, '\'), var, ''), sha))
+      call append(anchor, printf("silent! let g:plugs['%s'].commit = '%s'", name, sha))
       redraw
     endif
   endfor
 
   if a:0 > 0
     let fn = expand(a:1)
-    let fne = s:esc(fn)
+    if filereadable(fn) && !(a:force || s:ask(a:1.' already exists. Overwrite?'))
+      return
+    endif
     call writefile(getline(1, '$'), fn)
-    if !s:is_win | call s:system('chmod +x ' . fne) | endif
-    echo 'Saved to '.a:1
-    silent execute 'e' fne
+    echo 'Saved as '.a:1
+    silent execute 'e' s:esc(fn)
+    setf vim
   endif
 endfunction
 
@@ -2015,4 +2325,3 @@ endif
 
 let &cpo = s:cpo_save
 unlet s:cpo_save
-