*remote.txt*    For Vim version 6.0av.  Last change: 2001 Sep 09


		  VIM REFERENCE MANUAL    by Bram Moolenaar


Vim client-server communication				*client-server*

1. Common functionality		|clientserver|
2. X11 specific items		|x11-clientserver|
3. MS-Windows specific items	|w32-clientserver|

{Vi does not have any of these commands}

==============================================================================
1. Common functionality					*clientserver*

When compiled with the |+clientserver| option, Vim can act as a command
server.  It accepts messages from a client and executes them.  At the same
time, Vim can function as a client and send commands to a Vim server.

The following command line arguments are available:

    argument			meaning	~

   --remote [+{cmd}] {file} ...					*--remote*
				Open the file list in a remote
				Vim. The rest of the command line
				is taken as the file list.  Thus any
				non-file arguments must come before this.
   --remote-wait [+{cmd}] {file} ...				*--remote-wait*
				As above, but wait for files to
				complete (unload) in remote Vim.
								*--servername*
   --servername {name}		Send to or become the server {name}
								*--remote-send*
   --remote-send {keys}		Send {keys} to server and exit.
								*--remote-expr*
   --remote-expr {expr}		Evaluate {expr} in server and
				print the result on stdout.
								*--serverlist*
   --serverlist			Output a list of server names.


SERVER NAME

By default Vim will try to register the name under which it was invoked (gvim,
egvim ...).  This can be overridden with the --servername argument.  If the
specified name is not available, a postfix is applied until a free name is
encountered, ie. "gvim1" for the second invocation of gvim on a particular
X-server.  The resulting name is available in the servername builtin variable
|v:servername|.  The case of the server name is ignored, thus "gvim" and
"GVIM" are considered equal.

When Vim is invoked with --remote-send it will try to locate the server name
determined by the invocation name and --servername argument as described
above.  If an exact match is not available, the first server with the number
postfix will be used.  If no server can be located, Vim will start up
according to the rest of the command line and execute the kestrokes by itself.
This way it is not necessary to know whether gvim is already started when
sending command to it.  If a name with the number postfix is specified with
the --servername argument, it must match exactly.

The --serverlist argument will cause Vim to print a list of registered command
servers on the standard output (stdout) and exit.

Win32 Note: Making the Vim server go to the foreground doesn't always work,
because MS-Windows doesn't allow it.  The client will move the server to the
foreground when using the --remote or --remote-wait argument and the server
name starts with "g".


REMOTE EDITING

The --remote argument will cause a |:drop| command to be constructed from the
rest of the command line and sent as described above.
The --remote-wait argument does the same thing and additionally sets up to
wait for earch of the files to have been edited.  This uses the BufUnload
event, thus as soon as a file has been unloaded, Vim assumes you are done
editing it.
Note that the --remote and --remote-wait arguments will consume the rest of
the command line.  Ie. all remaining arguments will be regarded as filenames.
You can not put options there!


FUNCTIONS

There are a number of VimL functions for scripting the command server.  See
the description in |eval.txt| or use CTRL-] on the function name to jump to
the full explanation.

    synopsis				     explanation ~
    remote_expr(server, string, idvar)       send expression
    remote_send(server, string, idvar)       send key sequence
    serverlist()			     get a list of available servers
    remote_peek(serverid, retvar)	     check for reply string
    remote_read(serverid)		     read reply string
    server2client(serverid, string)	     send reply string

See also the explanation of |CTRL-\_CTRL-N|.  Very useful as a leading key
sequence.
The {serverid} for server2client() can be obtained with expand("<client>")

==============================================================================
2. X11 specific items					*x11-clientserver*
				    *E247* *E248* *E249* *E251* *E258* *E277*

The communication between client and server goes through the X server.  The
display of the Vim server must be specified.  The usual protection of the X
server is used, you must be able to open a window on the X server for the
communication to work.  It is possible to communicate between different
systems.

By default, a GUI Vim will register a name on the X-server by which it can be
addressed for subsequent execution of injected strings.  Vim can also act as
a client and send strings to other instances of Vim on the same X11 display.

When an X11 GUI Vim (gvim) is started, it will try to register a send-server
name on the 'VimRegistry' property on the root window.

A non GUI Vim with access to the X11 display (|xterm-clipboard| enabled), can
also act as a command server if a server name is explicitly given with the
--servername argument.

An empty --servername argument will cause the command server to be disabled.

To send commands to a Vim server from another application, read the source
file src/if_xcmdsrv.c, it contains some hints about the protocol used.

==============================================================================
2. Win32 specific items					*w32-clientserver*

Every Win32 Vim can work as a server, also in the console.  You do not need a
version compiled with OLE.  Windows messages are used, this works on any
version of MS-Windows.  But only communication within one system is possible.

Since MS-Windows messages are used, any other application should be able to
communicate with a Vim server.  An alternative is using the OLE functionality
|ole-interface|.

When using gvim, the --remote-wait only works properly this way: >

	start /w gvim --remote-wait file.txt
<
 vim:tw=78:sw=4:ts=8:ft=help:norl:
