X-Git-Url: https://git.r.bdr.sh/rbdr/dotfiles/blobdiff_plain/3f0234c4889f308d38bccf228c0ca7a14a6a4b6f..4350cafbf78d10f8007821e26765a954fa7b1fc2:/vim/autoload/plug.vim

diff --git a/vim/autoload/plug.vim b/vim/autoload/plug.vim
index ac14332..652caa8 100644
--- a/vim/autoload/plug.vim
+++ b/vim/autoload/plug.vim
@@ -25,7 +25,7 @@
 "   Plug 'scrooloose/nerdtree', { 'on':  'NERDTreeToggle' }
 "   Plug 'tpope/vim-fireplace', { 'for': 'clojure' }
 "
-"   " Using a non-master branch
+"   " Using a non-default branch
 "   Plug 'rdnetto/YCM-Generator', { 'branch': 'stable' }
 "
 "   " Using a tagged release; wildcard allowed (requires git 1.9.2 or above)
@@ -106,7 +106,7 @@ if s:is_win && &shellslash
 else
   let s:me = resolve(expand('<sfile>:p'))
 endif
-let s:base_spec = { 'branch': 'master', 'frozen': 0 }
+let s:base_spec = { 'branch': '', 'frozen': 0 }
 let s:TYPE = {
 \   'string':  type(''),
 \   'list':    type([]),
@@ -116,6 +116,94 @@ let s:TYPE = {
 let s:loaded = get(s:, 'loaded', {})
 let s:triggers = get(s:, 'triggers', {})
 
+function! s:is_powershell(shell)
+  return a:shell =~# 'powershell\(\.exe\)\?$' || a:shell =~# 'pwsh\(\.exe\)\?$'
+endfunction
+
+function! s:isabsolute(dir) abort
+  return a:dir =~# '^/' || (has('win32') && a:dir =~? '^\%(\\\|[A-Z]:\)')
+endfunction
+
+function! s:git_dir(dir) abort
+  let gitdir = s:trim(a:dir) . '/.git'
+  if isdirectory(gitdir)
+    return gitdir
+  endif
+  if !filereadable(gitdir)
+    return ''
+  endif
+  let gitdir = matchstr(get(readfile(gitdir), 0, ''), '^gitdir: \zs.*')
+  if len(gitdir) && !s:isabsolute(gitdir)
+    let gitdir = a:dir . '/' . gitdir
+  endif
+  return isdirectory(gitdir) ? gitdir : ''
+endfunction
+
+function! s:git_origin_url(dir) abort
+  let gitdir = s:git_dir(a:dir)
+  let config = gitdir . '/config'
+  if empty(gitdir) || !filereadable(config)
+    return ''
+  endif
+  return matchstr(join(readfile(config)), '\[remote "origin"\].\{-}url\s*=\s*\zs\S*\ze')
+endfunction
+
+function! s:git_revision(dir) abort
+  let gitdir = s:git_dir(a:dir)
+  let head = gitdir . '/HEAD'
+  if empty(gitdir) || !filereadable(head)
+    return ''
+  endif
+
+  let line = get(readfile(head), 0, '')
+  let ref = matchstr(line, '^ref: \zs.*')
+  if empty(ref)
+    return line
+  endif
+
+  if filereadable(gitdir . '/' . ref)
+    return get(readfile(gitdir . '/' . ref), 0, '')
+  endif
+
+  if filereadable(gitdir . '/packed-refs')
+    for line in readfile(gitdir . '/packed-refs')
+      if line =~# ' ' . ref
+        return matchstr(line, '^[0-9a-f]*')
+      endif
+    endfor
+  endif
+
+  return ''
+endfunction
+
+function! s:git_local_branch(dir) abort
+  let gitdir = s:git_dir(a:dir)
+  let head = gitdir . '/HEAD'
+  if empty(gitdir) || !filereadable(head)
+    return ''
+  endif
+  let branch = matchstr(get(readfile(head), 0, ''), '^ref: refs/heads/\zs.*')
+  return len(branch) ? branch : 'HEAD'
+endfunction
+
+function! s:git_origin_branch(spec)
+  if len(a:spec.branch)
+    return a:spec.branch
+  endif
+
+  " The file may not be present if this is a local repository
+  let gitdir = s:git_dir(a:spec.dir)
+  let origin_head = gitdir.'/refs/remotes/origin/HEAD'
+  if len(gitdir) && filereadable(origin_head)
+    return matchstr(get(readfile(origin_head), 0, ''),
+                  \ '^ref: refs/remotes/origin/\zs.*')
+  endif
+
+  " The command may not return the name of a branch in detached HEAD state
+  let result = s:lines(s:system('git symbolic-ref --short HEAD', a:spec.dir))
+  return v:shell_error ? '' : result[-1]
+endfunction
+
 if s:is_win
   function! s:plug_call(fn, ...)
     let shellslash = &shellslash
@@ -154,6 +242,8 @@ function! plug#begin(...)
     let home = s:path(s:plug_fnamemodify(s:plug_expand(a:1), ':p'))
   elseif exists('g:plug_home')
     let home = s:path(g:plug_home)
+  elseif has('nvim')
+    let home = stdpath('data') . '/plugged'
   elseif !empty(&rtp)
     let home = s:path(split(&rtp, ',')[0]) . '/plugged'
   else
@@ -179,7 +269,7 @@ function! s:define_commands()
   endif
   if has('win32')
   \ && &shellslash
-  \ && (&shell =~# 'cmd\.exe' || &shell =~# 'powershell\.exe')
+  \ && (&shell =~# 'cmd\(\.exe\)\?$' || s:is_powershell(&shell))
     return s:err('vim-plug does not support shell, ' . &shell . ', when shellslash is set.')
   endif
   if !has('nvim')
@@ -262,7 +352,7 @@ function! plug#end()
   endif
   let lod = { 'ft': {}, 'map': {}, 'cmd': {} }
 
-  if exists('g:did_load_filetypes')
+  if get(g:, 'did_load_filetypes', 0)
     filetype off
   endif
   for name in g:plugs_order
@@ -317,7 +407,7 @@ function! plug#end()
 
   for [map, names] in items(lod.map)
     for [mode, map_prefix, key_prefix] in
-          \ [['i', '<C-O>', ''], ['n', '', ''], ['v', '', 'gv'], ['o', '', '']]
+          \ [['i', '<C-\><C-O>', ''], ['n', '', ''], ['v', '', 'gv'], ['o', '', '']]
       execute printf(
       \ '%snoremap <silent> %s %s:<C-U>call <SID>lod_map(%s, %s, %s, "%s")<CR>',
       \ mode, map, map_prefix, string(map), string(names), mode != 'i', key_prefix)
@@ -372,7 +462,7 @@ endfunction
 
 function! s:git_version_requirement(...)
   if !exists('s:git_version')
-    let s:git_version = map(split(split(s:system('git --version'))[2], '\.'), 'str2nr(v:val)')
+    let s:git_version = map(split(split(s:system(['git', '--version']))[2], '\.'), 'str2nr(v:val)')
   endif
   return s:version_requirement(s:git_version, a:000)
 endfunction
@@ -419,7 +509,7 @@ if s:is_win
     let batchfile = s:plug_tempname().'.bat'
     call writefile(s:wrap_cmds(a:cmd), batchfile)
     let cmd = plug#shellescape(batchfile, {'shell': &shell, 'script': 0})
-    if &shell =~# 'powershell\.exe'
+    if s:is_powershell(&shell)
       let cmd = '& ' . cmd
     endif
     return [batchfile, cmd]
@@ -632,16 +722,38 @@ function! plug#(repo, ...)
     let g:plugs[name] = spec
     let s:loaded[name] = get(s:loaded, name, 0)
   catch
-    return s:err(v:exception)
+    return s:err(repo . ' ' . v:exception)
   endtry
 endfunction
 
 function! s:parse_options(arg)
   let opts = copy(s:base_spec)
   let type = type(a:arg)
+  let opt_errfmt = 'Invalid argument for "%s" option of :Plug (expected: %s)'
   if type == s:TYPE.string
+    if empty(a:arg)
+      throw printf(opt_errfmt, 'tag', 'string')
+    endif
     let opts.tag = a:arg
   elseif type == s:TYPE.dict
+    for opt in ['branch', 'tag', 'commit', 'rtp', 'dir', 'as']
+      if has_key(a:arg, opt)
+      \ && (type(a:arg[opt]) != s:TYPE.string || empty(a:arg[opt]))
+        throw printf(opt_errfmt, opt, 'string')
+      endif
+    endfor
+    for opt in ['on', 'for']
+      if has_key(a:arg, opt)
+      \ && type(a:arg[opt]) != s:TYPE.list
+      \ && (type(a:arg[opt]) != s:TYPE.string || empty(a:arg[opt]))
+        throw printf(opt_errfmt, opt, 'string or list')
+      endif
+    endfor
+    if has_key(a:arg, 'do')
+      \ && type(a:arg.do) != s:TYPE.funcref
+      \ && (type(a:arg.do) != s:TYPE.string || empty(a:arg.do))
+        throw printf(opt_errfmt, 'do', 'string or funcref')
+    endif
     call extend(opts, a:arg)
     if has_key(opts, 'dir')
       let opts.dir = s:dirpath(s:plug_expand(opts.dir))
@@ -698,7 +810,7 @@ function! s:syntax()
   syn match plugNumber /[0-9]\+[0-9.]*/ contained
   syn match plugBracket /[[\]]/ contained
   syn match plugX /x/ contained
-  syn match plugDash /^-/
+  syn match plugDash /^-\{1}\ /
   syn match plugPlus /^+/
   syn match plugStar /^*/
   syn match plugMessage /\(^- \)\@<=.*/
@@ -716,6 +828,7 @@ function! s:syntax()
   syn match plugError /^x.*/
   syn region plugDeleted start=/^\~ .*/ end=/^\ze\S/
   syn match plugH2 /^.*:\n-\+$/
+  syn match plugH2 /^-\{2,}/
   syn keyword Function PlugInstall PlugStatus PlugUpdate PlugClean
   hi def link plug1       Title
   hi def link plug2       Repeat
@@ -828,7 +941,7 @@ function! s:prepare(...)
     call s:new_window()
   endif
 
-  nnoremap <silent> <buffer> q  :if b:plug_preview==1<bar>pc<bar>endif<bar>bd<cr>
+  nnoremap <silent> <buffer> q :call <SID>close_pane()<cr>
   if a:0 == 0
     call s:finish_bindings()
   endif
@@ -850,6 +963,15 @@ function! s:prepare(...)
   endif
 endfunction
 
+function! s:close_pane()
+  if b:plug_preview == 1
+    pc
+    let b:plug_preview = -1
+  else
+    bd
+  endif
+endfunction
+
 function! s:assign_name()
   " Assign buffer name
   let prefix = '[Plugins]'
@@ -864,8 +986,15 @@ endfunction
 
 function! s:chsh(swap)
   let prev = [&shell, &shellcmdflag, &shellredir]
-  if !s:is_win && a:swap
-    set shell=sh shellredir=>%s\ 2>&1
+  if !s:is_win
+    set shell=sh
+  endif
+  if a:swap
+    if s:is_powershell(&shell)
+      let &shellredir = '2>&1 | Out-File -Encoding UTF8 %s'
+    elseif &shell =~# 'sh' || &shell =~# 'cmd\(\.exe\)\?$'
+      set shellredir=>%s\ 2>&1
+    endif
   endif
   return prev
 endfunction
@@ -898,7 +1027,7 @@ function! s:regress_bar()
 endfunction
 
 function! s:is_updated(dir)
-  return !empty(s:system_chomp('git log --pretty=format:"%h" "HEAD...HEAD@{1}"', a:dir))
+  return !empty(s:system_chomp(['git', 'log', '--pretty=format:%h', 'HEAD...HEAD@{1}'], a:dir))
 endfunction
 
 function! s:do(pull, force, todo)
@@ -935,6 +1064,7 @@ function! s:do(pull, force, todo)
         endif
       elseif type == s:TYPE.funcref
         try
+          call s:load_plugin(spec)
           let status = installed ? 'installed' : (updated ? 'updated' : 'unchanged')
           call spec.do({ 'name': name, 'status': status, 'force': a:force })
         catch
@@ -961,10 +1091,11 @@ 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:git_revision(a:spec.dir)
+  if !empty(output) && !s:hash_match(sha, s:lines(output)[0])
+    let credential_helper = s:git_version_requirement(2) ? '-c credential.helper= ' : ''
     let output = s:system(
-          \ 'git fetch --depth 999999 && git checkout '.plug#shellescape(sha).' --', a:spec.dir)
+          \ 'git '.credential_helper.'fetch --depth 999999 && git checkout '.plug#shellescape(sha).' --', a:spec.dir)
   endif
   return output
 endfunction
@@ -1079,11 +1210,17 @@ function! s:update_impl(pull, force, args) abort
   normal! 2G
   silent! redraw
 
-  let s:clone_opt = get(g:, 'plug_shallow', 1) ?
-        \ '--depth 1' . (s:git_version_requirement(1, 7, 10) ? ' --no-single-branch' : '') : ''
+  " Set remote name, overriding a possible user git config's clone.defaultRemoteName
+  let s:clone_opt = ['--origin', 'origin']
+  if get(g:, 'plug_shallow', 1)
+    call extend(s:clone_opt, ['--depth', '1'])
+    if s:git_version_requirement(1, 7, 10)
+      call add(s:clone_opt, '--no-single-branch')
+    endif
+  endif
 
   if has('win32unix') || has('wsl')
-    let s:clone_opt .= ' -c core.eol=lf -c core.autocrlf=input'
+    call extend(s:clone_opt, ['-c', 'core.eol=lf', '-c', 'core.autocrlf=input'])
   endif
 
   let s:submodule_opt = s:git_version_requirement(2, 8) ? ' --jobs='.threads : ''
@@ -1171,7 +1308,7 @@ function! s:update_finish()
         call s:log4(name, 'Checking out '.tag)
         let out = s:system('git checkout -q '.plug#shellescape(tag).' -- 2>&1', spec.dir)
       else
-        let branch = get(spec, 'branch', 'master')
+        let branch = s:git_origin_branch(spec)
         call s:log4(name, 'Merging origin/'.s:esc(branch))
         let out = s:system('git checkout -q '.plug#shellescape(branch).' -- 2>&1'
               \. (has_key(s:update.new, name) ? '' : ('&& git merge --ff-only '.plug#shellescape('origin/'.branch).' 2>&1')), spec.dir)
@@ -1264,7 +1401,7 @@ function! s:job_cb(fn, job, ch, data)
 endfunction
 
 function! s:nvim_cb(job_id, data, event) dict abort
-  return a:event == 'stdout' ?
+  return (a:event == 'stdout' || a:event == 'stderr') ?
     \ s:job_cb('s:job_out_cb',  self, 0, join(a:data, "\n")) :
     \ s:job_cb('s:job_exit_cb', self, 0, a:data)
 endfunction
@@ -1273,12 +1410,15 @@ function! s:spawn(name, cmd, opts)
   let job = { 'name': a:name, 'running': 1, 'error': 0, 'lines': [''],
             \ 'new': get(a:opts, 'new', 0) }
   let s:jobs[a:name] = job
-  let cmd = has_key(a:opts, 'dir') ? s:with_cd(a:cmd, a:opts.dir, 0) : a:cmd
-  let argv = s:is_win ? ['cmd', '/s', '/c', '"'.cmd.'"'] : ['sh', '-c', cmd]
 
   if s:nvim
+    if has_key(a:opts, 'dir')
+      let job.cwd = a:opts.dir
+    endif
+    let argv = a:cmd
     call extend(job, {
     \ 'on_stdout': function('s:nvim_cb'),
+    \ 'on_stderr': function('s:nvim_cb'),
     \ 'on_exit':   function('s:nvim_cb'),
     \ })
     let jid = s:plug_call('jobstart', argv, job)
@@ -1291,9 +1431,16 @@ function! s:spawn(name, cmd, opts)
             \ 'Invalid arguments (or job table is full)']
     endif
   elseif s:vim8
+    let cmd = join(map(copy(a:cmd), 'plug#shellescape(v:val, {"script": 0})'))
+    if has_key(a:opts, 'dir')
+      let cmd = s:with_cd(cmd, a:opts.dir, 0)
+    endif
+    let argv = s:is_win ? ['cmd', '/s', '/c', '"'.cmd.'"'] : ['sh', '-c', cmd]
     let jid = job_start(s:is_win ? join(argv, ' ') : argv, {
     \ 'out_cb':   function('s:job_cb', ['s:job_out_cb',  job]),
+    \ 'err_cb':   function('s:job_cb', ['s:job_out_cb',  job]),
     \ 'exit_cb':  function('s:job_cb', ['s:job_exit_cb', job]),
+    \ 'err_mode': 'raw',
     \ 'out_mode': 'raw'
     \})
     if job_status(jid) == 'run'
@@ -1304,7 +1451,7 @@ function! s:spawn(name, cmd, opts)
       let job.lines   = ['Failed to start job']
     endif
   else
-    let job.lines = s:lines(call('s:system', [cmd]))
+    let job.lines = s:lines(call('s:system', has_key(a:opts, 'dir') ? [a:cmd, a:opts.dir] : [a:cmd]))
     let job.error = v:shell_error != 0
     let job.running = 0
   endif
@@ -1401,8 +1548,14 @@ while 1 " Without TCO, Vim stack is bound to explode
     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', fetch_opt, prog), { 'dir': spec.dir })
+        let cmd = s:git_version_requirement(2) ? ['git', '-c', 'credential.helper=', 'fetch'] : ['git', 'fetch']
+        if has_tag && !empty(globpath(spec.dir, '.git/shallow'))
+          call extend(cmd, ['--depth', '99999999'])
+        endif
+        if !empty(prog)
+          call add(cmd, prog)
+        endif
+        call s:spawn(name, cmd, { 'dir': spec.dir })
       else
         let s:jobs[name] = { 'running': 0, 'lines': ['Already installed'], 'error': 0 }
       endif
@@ -1410,12 +1563,14 @@ while 1 " Without TCO, Vim stack is bound to explode
       let s:jobs[name] = { 'running': 0, 'lines': s:lines(error), 'error': 1 }
     endif
   else
-    call s:spawn(name,
-          \ printf('git clone %s %s %s %s 2>&1',
-          \ has_tag ? '' : s:clone_opt,
-          \ prog,
-          \ plug#shellescape(spec.uri, {'script': 0}),
-          \ plug#shellescape(s:trim(spec.dir), {'script': 0})), { 'new': 1 })
+    let cmd = ['git', 'clone']
+    if !has_tag
+      call extend(cmd, s:clone_opt)
+    endif
+    if !empty(prog)
+      call add(cmd, prog)
+    endif
+    call s:spawn(name, extend(cmd, [spec.uri, s:trim(spec.dir)]), { 'new': 1 })
   endif
 
   if !s:jobs[name].running
@@ -1452,7 +1607,7 @@ G_NVIM = vim.eval("has('nvim')") == '1'
 G_PULL = vim.eval('s:update.pull') == '1'
 G_RETRIES = int(vim.eval('get(g:, "plug_retries", 2)')) + 1
 G_TIMEOUT = int(vim.eval('get(g:, "plug_timeout", 60)'))
-G_CLONE_OPT = vim.eval('s:clone_opt')
+G_CLONE_OPT = ' '.join(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()
@@ -1989,7 +2144,7 @@ function! s:update_ruby()
     end
   } if VIM::evaluate('s:mac_gui') == 1
 
-  clone_opt = VIM::evaluate('s:clone_opt')
+  clone_opt = VIM::evaluate('s:clone_opt').join(' ')
   progress = VIM::evaluate('s:progress_opt(1)')
   nthr.times do
     mtx.synchronize do
@@ -2055,13 +2210,29 @@ function! s:shellesc_sh(arg)
   return "'".substitute(a:arg, "'", "'\\\\''", 'g')."'"
 endfunction
 
+" Escape the shell argument based on the shell.
+" Vim and Neovim's shellescape() are insufficient.
+" 1. shellslash determines whether to use single/double quotes.
+"    Double-quote escaping is fragile for cmd.exe.
+" 2. It does not work for powershell.
+" 3. It does not work for *sh shells if the command is executed
+"    via cmd.exe (ie. cmd.exe /c sh -c command command_args)
+" 4. It does not support batchfile syntax.
+"
+" Accepts an optional dictionary with the following keys:
+" - shell: same as Vim/Neovim 'shell' option.
+"          If unset, fallback to 'cmd.exe' on Windows or 'sh'.
+" - script: If truthy and shell is cmd.exe, escape for batchfile syntax.
 function! plug#shellescape(arg, ...)
+  if a:arg =~# '^[A-Za-z0-9_/:.-]\+$'
+    return a:arg
+  endif
   let opts = a:0 > 0 && type(a:1) == s:TYPE.dict ? a:1 : {}
   let shell = get(opts, 'shell', s:is_win ? 'cmd.exe' : 'sh')
   let script = get(opts, 'script', 1)
-  if shell =~# 'cmd\.exe'
+  if shell =~# 'cmd\(\.exe\)\?$'
     return s:shellesc_cmd(a:arg, script)
-  elseif shell =~# 'powershell\.exe' || shell =~# 'pwsh$'
+  elseif s:is_powershell(shell)
     return s:shellesc_ps1(a:arg)
   endif
   return s:shellesc_sh(a:arg)
@@ -2105,8 +2276,24 @@ function! s:system(cmd, ...)
   let batchfile = ''
   try
     let [sh, shellcmdflag, shrd] = s:chsh(1)
-    let cmd = a:0 > 0 ? s:with_cd(a:cmd, a:1) : a:cmd
-    if s:is_win
+    if type(a:cmd) == s:TYPE.list
+      " Neovim's system() supports list argument to bypass the shell
+      " but it cannot set the working directory for the command.
+      " Assume that the command does not rely on the shell.
+      if has('nvim') && a:0 == 0
+        return system(a:cmd)
+      endif
+      let cmd = join(map(copy(a:cmd), 'plug#shellescape(v:val, {"shell": &shell, "script": 0})'))
+      if s:is_powershell(&shell)
+        let cmd = '& ' . cmd
+      endif
+    else
+      let cmd = a:cmd
+    endif
+    if a:0 > 0
+      let cmd = s:with_cd(cmd, a:1, type(a:cmd) != s:TYPE.list)
+    endif
+    if s:is_win && type(a:cmd) != s:TYPE.list
       let [batchfile, cmd] = s:batchfile(cmd)
     endif
     return system(cmd)
@@ -2126,18 +2313,17 @@ endfunction
 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 -f .git/config remote.origin.url', a:spec.dir))
+    let result = [s:git_local_branch(a:spec.dir), s:git_origin_url(a:spec.dir)]
     let remote = result[-1]
-    if v:shell_error
+    if empty(remote)
       let err = join([remote, 'PlugClean required.'], "\n")
     elseif !s:compare_git_uri(remote, a:spec.uri)
       let err = join(['Invalid URI: '.remote,
                     \ 'Expected:    '.a:spec.uri,
                     \ 'PlugClean required.'], "\n")
     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 sha = s:git_revision(a:spec.dir)
+      if empty(sha)
         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)',
@@ -2145,8 +2331,9 @@ function! s:git_validate(spec, check_branch)
                       \ 'PlugUpdate required.'], "\n")
       endif
     elseif a:check_branch
-      let branch = result[0]
+      let current_branch = result[0]
       " Check tag
+      let origin_branch = s:git_origin_branch(a:spec)
       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 && a:spec.tag !~ '\*'
@@ -2154,25 +2341,26 @@ function! s:git_validate(spec, check_branch)
                 \ (empty(tag) ? 'N/A' : tag), a:spec.tag)
         endif
       " Check branch
-      elseif a:spec.branch !=# branch
+      elseif origin_branch !=# current_branch
         let err = printf('Invalid branch: %s (expected: %s). Try PlugUpdate.',
-              \ branch, a:spec.branch)
+              \ current_branch, origin_branch)
       endif
       if empty(err)
-        let [ahead, behind] = split(s:lastline(s:system(printf(
-              \ 'git rev-list --count --left-right HEAD...origin/%s',
-              \ a:spec.branch), a:spec.dir)), '\t')
+        let [ahead, behind] = split(s:lastline(s:system([
+        \ 'git', 'rev-list', '--count', '--left-right',
+        \ printf('HEAD...origin/%s', origin_branch)
+        \ ], a:spec.dir)), '\t')
         if !v:shell_error && ahead
           if behind
             " Only mention PlugClean if diverged, otherwise it's likely to be
             " pushable (and probably not that messed up).
             let err = printf(
                   \ "Diverged from origin/%s (%d commit(s) ahead and %d commit(s) behind!\n"
-                  \ .'Backup local changes and run PlugClean and PlugUpdate to reinstall it.', a:spec.branch, ahead, behind)
+                  \ .'Backup local changes and run PlugClean and PlugUpdate to reinstall it.', origin_branch, ahead, behind)
           else
             let err = printf("Ahead of origin/%s by %d commit(s).\n"
                   \ .'Cannot update until local changes are pushed.',
-                  \ a:spec.branch, ahead)
+                  \ origin_branch, ahead)
           endif
         endif
       endif
@@ -2185,7 +2373,9 @@ endfunction
 
 function! s:rm_rf(dir)
   if isdirectory(a:dir)
-    call s:system((s:is_win ? 'rmdir /S /Q ' : 'rm -rf ') . plug#shellescape(a:dir))
+    return s:system(s:is_win
+    \ ? 'rmdir /S /Q '.plug#shellescape(a:dir)
+    \ : ['rm', '-rf', a:dir])
   endif
 endfunction
 
@@ -2267,6 +2457,7 @@ endfunction
 function! s:delete(range, force)
   let [l1, l2] = a:range
   let force = a:force
+  let err_count = 0
   while l1 <= l2
     let line = getline(l1)
     if line =~ '^- ' && isdirectory(line[2:])
@@ -2275,11 +2466,22 @@ function! s:delete(range, force)
       let answer = force ? 1 : s:ask('Delete '.line[2:].'?', 1)
       let force = force || answer > 1
       if answer
-        call s:rm_rf(line[2:])
+        let err = 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))
+        if empty(err)
+          call setline(l1, '~'.line[1:])
+          let s:clean_count += 1
+        else
+          delete _
+          call append(l1 - 1, s:format_message('x', line[1:], err))
+          let l2 += len(s:lines(err))
+          let err_count += 1
+        endif
+        let msg = printf('Removed %d directories.', s:clean_count)
+        if err_count > 0
+          let msg .= printf(' Failed to remove %d directories.', err_count)
+        endif
+        call setline(4, msg)
         setlocal nomodifiable
       endif
     endif
@@ -2294,7 +2496,7 @@ function! s:upgrade()
   let new = tmp . '/plug.vim'
 
   try
-    let out = s:system(printf('git clone --depth 1 %s %s', plug#shellescape(s:plug_src), plug#shellescape(tmp)))
+    let out = s:system(['git', 'clone', '--depth', '1', s:plug_src, tmp])
     if v:shell_error
       return s:err('Error upgrading vim-plug: '. out)
     endif
@@ -2419,26 +2621,34 @@ function! s:preview_commit()
 
   let sha = matchstr(getline('.'), '^  \X*\zs[0-9a-f]\{7,9}')
   if empty(sha)
-    return
+    let name = matchstr(getline('.'), '^- \zs[^:]*\ze:$')
+    if empty(name)
+      return
+    endif
+    let title = 'HEAD@{1}..'
+    let command = 'git diff --no-color HEAD@{1}'
+  else
+    let title = sha
+    let command = 'git show --no-color --pretty=medium '.sha
+    let name = s:find_name(line('.'))
   endif
 
-  let name = s:find_name(line('.'))
   if empty(name) || !has_key(g:plugs, name) || !isdirectory(g:plugs[name].dir)
     return
   endif
 
   if exists('g:plug_pwindow') && !s:is_preview_window_open()
     execute g:plug_pwindow
-    execute 'e' sha
+    execute 'e' title
   else
-    execute 'pedit' sha
+    execute 'pedit' title
     wincmd P
   endif
-  setlocal previewwindow filetype=git buftype=nofile nobuflisted modifiable
+  setlocal previewwindow filetype=git buftype=nofile bufhidden=wipe nobuflisted modifiable
   let batchfile = ''
   try
     let [sh, shellcmdflag, shrd] = s:chsh(1)
-    let cmd = 'cd '.plug#shellescape(g:plugs[name].dir).' && git show --no-color --pretty=medium '.sha
+    let cmd = 'cd '.plug#shellescape(g:plugs[name].dir).' && '.command
     if s:is_win
       let [batchfile, cmd] = s:batchfile(cmd)
     endif
@@ -2488,18 +2698,23 @@ function! s:diff()
     endif
     call s:append_ul(2, origin ? 'Pending updates:' : 'Last update:')
     for [k, v] in plugs
-      let range = origin ? '..origin/'.v.branch : 'HEAD@{1}..'
-      let cmd = 'git log --graph --color=never '
-      \ . (s:git_version_requirement(2, 10, 0) ? '--no-show-signature ' : '')
-      \ . join(map(['--pretty=format:%x01%h%x01%d%x01%s%x01%cr', range], 'plug#shellescape(v:val)'))
-      if has_key(v, 'rtp')
-        let cmd .= ' -- '.plug#shellescape(v.rtp)
-      endif
-      let diff = s:system_chomp(cmd, 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
+      let branch = s:git_origin_branch(v)
+      if len(branch)
+        let range = origin ? '..origin/'.branch : 'HEAD@{1}..'
+        let cmd = ['git', 'log', '--graph', '--color=never']
+        if s:git_version_requirement(2, 10, 0)
+          call add(cmd, '--no-show-signature')
+        endif
+        call extend(cmd, ['--pretty=format:%x01%h%x01%d%x01%s%x01%cr', range])
+        if has_key(v, 'rtp')
+          call extend(cmd, ['--', v.rtp])
+        endif
+        let diff = s:system_chomp(cmd, 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
       endif
       let bar .= '='
       call s:progress_bar(2, bar, len(total))
@@ -2559,9 +2774,9 @@ function! s:snapshot(force, ...) abort
   1
   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)')))
+        \'has_key(v:val, "uri") && isdirectory(v:val.dir)')))
   for name in reverse(names)
-    let sha = s:system_chomp('git rev-parse --short HEAD', g:plugs[name].dir)
+    let sha = has_key(g:plugs[name], 'commit') ? g:plugs[name].commit : s:git_revision(g:plugs[name].dir)
     if !empty(sha)
       call append(anchor, printf("silent! let g:plugs['%s'].commit = '%s'", name, sha))
       redraw