Work around hang on very old Vim

Closes https://github.com/tpope/vim-pathogen/issues/136

autoload/pathogen.vim

@@ -97,10 +97,12 @@ function! pathogen#is_disabled(path) abort
     return 1
   endif
   let sep = pathogen#slash()
-  let blacklist = map(
+  let blacklist =
         \ get(g:, 'pathogen_blacklist', get(g:, 'pathogen_disabled', [])) +
-        \ pathogen#split($VIMBLACKLIST),
-        \ 'substitute(v:val, "[\\/]$", "", "")')
+        \ pathogen#split($VIMBLACKLIST)
+  if !empty(blacklist)
+    call map(blacklist, 'substitute(v:val, "[\\/]$", "", "")')
+  endif
   return index(blacklist, fnamemodify(a:path, ':t')) != -1 || index(blacklist, a:path) != -1
 endfunction
 
@@ -284,4 +286,68 @@ function! pathogen#runtime_append_all_bundles(...) abort
   return pathogen#interpose(a:0 ? a:1 . '/{}' : 'bundle/{}')
 endfunction
 
+if exists(':Vedit')
+  finish
+endif
+
+let s:vopen_warning = 0
+
+function! s:find(count,cmd,file,lcd)
+  let rtp = pathogen#join(1,pathogen#split(&runtimepath))
+  let file = pathogen#runtime_findfile(a:file,a:count)
+  if file ==# ''
+    return "echoerr 'E345: Can''t find file \"".a:file."\" in runtimepath'"
+  endif
+  if !s:vopen_warning
+    let s:vopen_warning = 1
+    let warning = '|echohl WarningMsg|echo "Install scriptease.vim to continue using :V'.a:cmd.'"|echohl NONE'
+  else
+    let warning = ''
+  endif
+  if a:lcd
+    let path = file[0:-strlen(a:file)-2]
+    execute 'lcd `=path`'
+    return a:cmd.' '.pathogen#fnameescape(a:file) . warning
+  else
+    return a:cmd.' '.pathogen#fnameescape(file) . warning
+  endif
+endfunction
+
+function! s:Findcomplete(A,L,P)
+  let sep = pathogen#slash()
+  let cheats = {
+        \'a': 'autoload',
+        \'d': 'doc',
+        \'f': 'ftplugin',
+        \'i': 'indent',
+        \'p': 'plugin',
+        \'s': 'syntax'}
+  if a:A =~# '^\w[\\/]' && has_key(cheats,a:A[0])
+    let request = cheats[a:A[0]].a:A[1:-1]
+  else
+    let request = a:A
+  endif
+  let pattern = substitute(request,'/\|\'.sep,'*'.sep,'g').'*'
+  let found = {}
+  for path in pathogen#split(&runtimepath)
+    let path = expand(path, ':p')
+    let matches = split(glob(path.sep.pattern),"\n")
+    call map(matches,'isdirectory(v:val) ? v:val.sep : v:val')
+    call map(matches,'expand(v:val, ":p")[strlen(path)+1:-1]')
+    for match in matches
+      let found[match] = 1
+    endfor
+  endfor
+  return sort(keys(found))
+endfunction
+
+command! -bar -bang -range=1 -nargs=1 -complete=customlist,s:Findcomplete Ve       :execute s:find(<count>,'edit<bang>',<q-args>,0)
+command! -bar -bang -range=1 -nargs=1 -complete=customlist,s:Findcomplete Vedit    :execute s:find(<count>,'edit<bang>',<q-args>,0)
+command! -bar -bang -range=1 -nargs=1 -complete=customlist,s:Findcomplete Vopen    :execute s:find(<count>,'edit<bang>',<q-args>,1)
+command! -bar -bang -range=1 -nargs=1 -complete=customlist,s:Findcomplete Vsplit   :execute s:find(<count>,'split',<q-args>,<bang>1)
+command! -bar -bang -range=1 -nargs=1 -complete=customlist,s:Findcomplete Vvsplit  :execute s:find(<count>,'vsplit',<q-args>,<bang>1)
+command! -bar -bang -range=1 -nargs=1 -complete=customlist,s:Findcomplete Vtabedit :execute s:find(<count>,'tabedit',<q-args>,<bang>1)
+command! -bar -bang -range=1 -nargs=1 -complete=customlist,s:Findcomplete Vpedit   :execute s:find(<count>,'pedit',<q-args>,<bang>1)
+command! -bar -bang -range=1 -nargs=1 -complete=customlist,s:Findcomplete Vread    :execute s:find(<count>,'read',<q-args>,<bang>1)
+
 " vim:set et sw=2 foldmethod=expr foldexpr=getline(v\:lnum)=~'^\"\ Section\:'?'>1'\:getline(v\:lnum)=~#'^fu'?'a1'\:getline(v\:lnum)=~#'^endf'?'s1'\:'=':