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" Vim Plugin: Edit the file with an existing Vim if possible
" Maintainer: Bram Moolenaar
" Last Change: 2022 Jun 17
" To use add ":packadd! editexisting" in your vimrc file.
" 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.
try
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()")
if remote_expr(servername, "exists('*EditExisting')")
" 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
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
catch /^Vim\%((\a\+)\)\=:E241:/
" Unable to send to this server, ignore it.
endtry
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)
" Get the window number of the file in the current tab page.
let winnr = bufwinnr(a:fname)
if winnr <= 0
" Not found, look in other tab pages.
let bufnr = bufnr(a:fname)
for i in range(tabpagenr('$'))
if index(tabpagebuflist(i + 1), bufnr) >= 0
" Make this tab page the current one and find the window number.
exe 'tabnext ' . (i + 1)
let winnr = bufwinnr(a:fname)
break
endif
endfor
endif
if winnr > 0
exe winnr . "wincmd w"
elseif exists('*fnameescape')
exe "split " . fnameescape(a:fname)
else
exe "split " . escape(a:fname, " \t\n*?[{`$\\%#'\"|!<")
endif
if a:command != ''
exe "normal! " . a:command
endif
redraw
endfunc
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