updated for version 7.0167
diff --git a/runtime/macros/editexisting.vim b/runtime/macros/editexisting.vim
new file mode 100644
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+" Vim Plugin: Edit the file with an existing Vim if possible
+" Maintainer: Bram Moolenaar
+" Last Change: 2005 Dec 11
+
+" This is a plugin, drop it in your (Unix) ~/.vim/plugin or (Win32)
+" $VIM/vimfiles/plugin directory.
+
+" This plugin serves two purposes:
+" 1. On startup, if we were invoked with one file name argument and the file
+" is not modified then try to find another Vim instance that is editing
+" this file. If there is one then bring it to the foreground and exit.
+" 2. When a file is edited and a swap file exists for it, try finding that
+" other Vim and bring it to the foreground. Requires Vim 7, because it
+" uses the SwapExists autocommand event.
+
+" Function that finds the Vim instance that is editing "filename" and brings
+" it to the foreground.
+func s:EditElsewhere(filename)
+ let fname_esc = substitute(a:filename, "'", "''", "g")
+
+ let servers = serverlist()
+ while servers != ''
+ " Get next server name in "servername"; remove it from "servers".
+ let i = match(servers, "\n")
+ if i == -1
+ let servername = servers
+ let servers = ''
+ else
+ let servername = strpart(servers, 0, i)
+ let servers = strpart(servers, i + 1)
+ endif
+
+ " Skip ourselves.
+ if servername ==? v:servername
+ continue
+ endif
+
+ " Check if this server is editing our file.
+ if remote_expr(servername, "bufloaded('" . fname_esc . "')")
+ " Yes, bring it to the foreground.
+ if has("win32")
+ call remote_foreground(servername)
+ endif
+ call remote_expr(servername, "foreground()")
+
+ " Make sure the file is visible in a window (not hidden).
+ " If v:swapcommand exists and is set, send it to the server.
+ if exists("v:swapcommand")
+ let c = substitute(v:swapcommand, "'", "''", "g")
+ call remote_expr(servername, "EditExisting('" . fname_esc . "', '" . c . "')")
+ else
+ call remote_expr(servername, "EditExisting('" . fname_esc . "', '')")
+ endif
+
+ if !(has('vim_starting') && has('gui_running') && has('gui_win32'))
+ " Tell the user what is happening. Not when the GUI is starting
+ " though, it would result in a message box.
+ echomsg "File is being edited by " . servername
+ sleep 2
+ endif
+ return 'q'
+ endif
+ endwhile
+ return ''
+endfunc
+
+" When the plugin is loaded and there is one file name argument: Find another
+" Vim server that is editing this file right now.
+if argc() == 1 && !&modified
+ if s:EditElsewhere(expand("%:p")) == 'q'
+ quit
+ endif
+endif
+
+" Setup for handling the situation that an existing swap file is found.
+try
+ au! SwapExists * let v:swapchoice = s:EditElsewhere(expand("<afile>:p"))
+catch
+ " Without SwapExists we don't do anything for ":edit" commands
+endtry
+
+" Function used on the server to make the file visible and possibly execute a
+" command.
+func! EditExisting(fname, command)
+ let n = bufwinnr(a:fname)
+ if n > 0
+ exe n . "wincmd w"
+ else
+ exe "split " . escape(a:fname, ' #%"|')
+ endif
+
+ if a:command != ''
+ exe "normal " . a:command
+ endif
+
+ redraw
+endfunc