;; Keywords: processes
;; Changes by peck@sun.com and by rms.
+;; Overhaul by Karoly Lorentey <lorentey@elte.hu> for multi-tty support.
;; This file is part of GNU Emacs.
;; This program transmits the file names to Emacs through
;; the server subprocess, and Emacs visits them and lets you edit them.
-;; Note that any number of clients may dispatch files to emacs to be edited.
+;; Note that any number of clients may dispatch files to Emacs to be edited.
;; When you finish editing a Server buffer, again call server-edit
;; to mark that buffer as done for the client and switch to the next
(defvar server-clients nil
"List of current server clients.
-Each element is (CLIENTID BUFFERS...) where CLIENTID is a string
-that can be given to the server process to identify a client.
-When a buffer is marked as \"done\", it is removed from this list.")
+Each element is (PROC PROPERTIES...) where PROC is a process object,
+and PROPERTIES is an association list of client properties.")
(defvar server-buffer-clients nil
"List of client ids for clients requesting editing of current buffer.")
(defvar server-name "server")
-(defvar server-socket-dir
- (format "/tmp/emacs%d" (user-uid)))
+(defvar server-socket-dir nil
+ "The directory in which to place the server socket.
+Initialized by `server-start'.")
+
+(defun server-client (proc)
+ "Return the Emacs client corresponding to PROC.
+PROC must be a process object.
+The car of the result is PROC; the cdr is an association list.
+See `server-client-get' and `server-client-set'."
+ (assq proc server-clients))
+
+(defun server-client-get (client property)
+ "Get the value of PROPERTY in CLIENT.
+CLIENT may be a process object, or a client returned by `server-client'.
+Return nil if CLIENT has no such property."
+ (or (listp client) (setq client (server-client client)))
+ (cdr (assq property (cdr client))))
+
+(defun server-client-set (client property value)
+ "Set the PROPERTY to VALUE in CLIENT, and return VALUE.
+CLIENT may be a process object, or a client returned by `server-client'."
+ (let (p proc)
+ (if (listp client)
+ (setq proc (car client))
+ (setq proc client
+ client (server-client client)))
+ (setq p (assq property client))
+ (cond
+ (p (setcdr p value))
+ (client (setcdr client (cons (cons property value) (cdr client))))
+ (t (setq server-clients
+ `((,proc (,property . ,value)) . ,server-clients))))
+ value))
+
+(defun server-clients-with (property value)
+ "Return a list of clients with PROPERTY set to VALUE."
+ (let (result)
+ (dolist (client server-clients result)
+ (when (equal value (server-client-get client property))
+ (setq result (cons (car client) result))))))
+
+(defun server-add-client (proc)
+ "Create a client for process PROC, if it doesn't already have one.
+New clients have no properties."
+ (unless (server-client proc)
+ (setq server-clients (cons (cons proc nil)
+ server-clients))))
+
+;;;###autoload
+(defun server-getenv (variable &optional frame)
+ "Get the value of VARIABLE in the client environment of frame FRAME.
+VARIABLE should be a string. Value is nil if VARIABLE is undefined in
+the environment. Otherwise, value is a string.
+
+If FRAME is an emacsclient frame, then the variable is looked up
+in the environment of the emacsclient process; otherwise the
+function consults the environment of the Emacs process.
+
+If FRAME is nil or missing, then the selected frame is used."
+ (when (not frame) (setq frame (selected-frame)))
+ (let ((client (frame-parameter frame 'client)) env)
+ (if (null client)
+ (getenv variable)
+ (setq env (server-client-get client 'environment))
+ (if (null env)
+ (getenv variable)
+ (cdr (assoc variable env))))))
+
+(defmacro server-with-client-environment (client vars &rest body)
+ "Evaluate BODY with environment variables VARS set to those of CLIENT.
+The environment variables are then restored to their previous values.
+
+VARS should be a list of strings."
+ (declare (indent 2))
+ (let ((oldvalues (make-symbol "oldvalues"))
+ (var (make-symbol "var"))
+ (value (make-symbol "value"))
+ (pair (make-symbol "pair")))
+ `(let (,oldvalues)
+ (dolist (,var (quote ,vars))
+ (let ((,value (cdr (assoc ,var (server-client-get ,client 'environment)))))
+ (setq ,oldvalues (cons (cons ,var (getenv ,var)) ,oldvalues))
+ (setenv ,var ,value)))
+ (unwind-protect
+ (progn ,@body)
+ (dolist (,pair ,oldvalues)
+ (setenv (car ,pair) (cdr ,pair)))))))
+
+(defun server-delete-client (client &optional noframe)
+ "Delete CLIENT, including its buffers, devices and frames.
+If NOFRAME is non-nil, let the frames live. (To be used from
+`delete-frame-functions'."
+ ;; Force a new lookup of client (prevents infinite recursion).
+ (setq client (server-client
+ (if (listp client) (car client) client)))
+ (let ((proc (car client))
+ (buffers (server-client-get client 'buffers)))
+ (when client
+ (setq server-clients (delq client server-clients))
+
+ (dolist (buf buffers)
+ (when (buffer-live-p buf)
+ (with-current-buffer buf
+ ;; Remove PROC from the clients of each buffer.
+ (setq server-buffer-clients (delq proc server-buffer-clients))
+ ;; Kill the buffer if necessary.
+ (when (and (null server-buffer-clients)
+ (or (and server-kill-new-buffers
+ (not server-existing-buffer))
+ (server-temp-file-p)))
+ (kill-buffer (current-buffer))))))
+
+ ;; Delete the client's tty.
+ (let ((device (server-client-get client 'device)))
+ (when (eq (display-live-p device) t)
+ (delete-display device)))
+
+ ;; Delete the client's frames.
+ (unless noframe
+ (dolist (frame (frame-list))
+ (if (and (frame-live-p frame)
+ (equal (car client) (frame-parameter frame 'client)))
+ (delete-frame frame))))
+
+ ;; Delete the client's process.
+ (if (eq (process-status (car client)) 'open)
+ (delete-process (car client)))
+
+ (server-log "Deleted" proc))))
(defun server-log (string &optional client)
- "If a *server* buffer exists, write STRING to it for logging purposes."
+ "If a *server* buffer exists, write STRING to it for logging purposes.
+If CLIENT is non-nil, add a description of it to the logged
+message."
(if (get-buffer "*server*")
(with-current-buffer "*server*"
(goto-char (point-max))
(insert (current-time-string)
- (if client (format " %s:" client) " ")
+ (cond
+ ((null client) " ")
+ ((listp client) (format " %s: " (car client)))
+ (t (format " %s: " client)))
string)
(or (bolp) (newline)))))
(defun server-sentinel (proc msg)
- (let ((client (assq proc server-clients)))
- ;; Remove PROC from the list of clients.
- (when client
- (setq server-clients (delq client server-clients))
- (dolist (buf (cdr client))
- (with-current-buffer buf
- ;; Remove PROC from the clients of each buffer.
- (setq server-buffer-clients (delq proc server-buffer-clients))
- ;; Kill the buffer if necessary.
- (when (and (null server-buffer-clients)
- (or (and server-kill-new-buffers
- (not server-existing-buffer))
- (server-temp-file-p)))
- (kill-buffer (current-buffer)))))))
- (server-log (format "Status changed to %s" (process-status proc)) proc))
-
-(defun server-select-display (display)
- ;; If the current frame is on `display' we're all set.
- (unless (equal (frame-parameter (selected-frame) 'display) display)
- ;; Otherwise, look for an existing frame there and select it.
- (dolist (frame (frame-list))
- (when (equal (frame-parameter frame 'display) display)
- (select-frame frame)))
- ;; If there's no frame on that display yet, create a dummy one
- ;; and select it.
- (unless (equal (frame-parameter (selected-frame) 'display) display)
- (select-frame
- (make-frame-on-display
- display
- ;; This frame is only there in place of an actual "current display"
- ;; setting, so we want it to be as unobtrusive as possible. That's
- ;; what the invisibility is for. The minibuffer setting is so that
- ;; we don't end up displaying a buffer in it (which noone would
- ;; notice).
- '((visibility . nil) (minibuffer . only)))))))
+ "The process sentinel for Emacs server connections."
+ (server-log (format "Status changed to %s: %s" (process-status proc) msg) proc)
+ (server-delete-client proc))
+
+(defun server-handle-delete-frame (frame)
+ "Delete the client connection when the emacsclient frame is deleted."
+ (let ((proc (frame-parameter frame 'client)))
+ (when (and (frame-live-p frame)
+ proc
+ (or (window-system frame)
+ ;; A terminal device must not yet be deleted if
+ ;; there are other frames on it.
+ (< 0 (let ((frame-num 0))
+ (mapc (lambda (f)
+ (when (eq (frame-display f)
+ (frame-display frame))
+ (setq frame-num (1+ frame-num))))
+ (frame-list))
+ frame-num))))
+ (server-log (format "server-handle-delete-frame, frame %s" frame) proc)
+ (server-delete-client proc 'noframe)))) ; Let delete-frame delete the frame later.
+
+(defun server-handle-suspend-tty (device)
+ "Notify the emacsclient process to suspend itself when its tty device is suspended."
+ (dolist (proc (server-clients-with 'device device))
+ (server-log (format "server-handle-suspend-tty, device %s" device) proc)
+ (condition-case err
+ (server-send-string proc "-suspend \n")
+ (file-error (condition-case nil (server-delete-client proc) (error nil))))))
(defun server-unquote-arg (arg)
+ "Remove &-quotation from ARG.
+See `server-quote-arg' and `server-process-filter'."
(replace-regexp-in-string
"&." (lambda (s)
(case (aref s 1)
(t " ")))
arg t t))
+(defun server-quote-arg (arg)
+ "In ARG, insert a & before each &, each space, each newline, and -.
+Change spaces to underscores, too, so that the return value never
+contains a space.
+
+See `server-unquote-arg' and `server-process-filter'."
+ (replace-regexp-in-string
+ "[-&\n ]" (lambda (s)
+ (case (aref s 0)
+ (?& "&&")
+ (?- "&-")
+ (?\n "&n")
+ (?\s "&_")))
+ arg t t))
+
+(defun server-send-string (proc string)
+ "A wrapper around `proc-send-string' for logging."
+ (server-log (concat "Sent " string) proc)
+ (process-send-string proc string))
+
(defun server-ensure-safe-dir (dir)
"Make sure DIR is a directory with no race-condition issues.
Creates the directory if necessary and makes sure:
(defun server-start (&optional leave-dead)
"Allow this Emacs process to be a server for client processes.
This starts a server communications subprocess through which
-client \"editors\" can send your editing commands to this Emacs job.
-To use the server, set up the program `emacsclient' in the
+client \"editors\" can send your editing commands to this Emacs
+job. To use the server, set up the program `emacsclient' in the
Emacs distribution as your standard \"editor\".
-Prefix arg means just kill any existing server communications subprocess."
+Prefix arg LEAVE-DEAD means just kill any existing server
+communications subprocess."
(interactive "P")
- ;; Make sure there is a safe directory in which to place the socket.
- (server-ensure-safe-dir server-socket-dir)
- ;; kill it dead!
- (if server-process
- (condition-case () (delete-process server-process) (error nil)))
- ;; Delete the socket files made by previous server invocations.
- (condition-case ()
- (delete-file (expand-file-name server-name server-socket-dir))
- (error nil))
- ;; If this Emacs already had a server, clear out associated status.
- (while server-clients
- (let ((buffer (nth 1 (car server-clients))))
- (server-buffer-done buffer)))
- (unless leave-dead
+ (when (or
+ (not server-clients)
+ (yes-or-no-p
+ "The current server still has clients; delete them? "))
+ ;; It is safe to get the user id now.
+ (setq server-socket-dir (or server-socket-dir
+ (format "/tmp/emacs%d" (user-uid))))
+ ;; Make sure there is a safe directory in which to place the socket.
+ (server-ensure-safe-dir server-socket-dir)
+ ;; kill it dead!
(if server-process
- (server-log (message "Restarting server")))
- (letf (((default-file-modes) ?\700))
- (setq server-process
- (make-network-process
- :name "server" :family 'local :server t :noquery t
- :service (expand-file-name server-name server-socket-dir)
- :sentinel 'server-sentinel :filter 'server-process-filter
- ;; We must receive file names without being decoded.
- ;; Those are decoded by server-process-filter according
- ;; to file-name-coding-system.
- :coding 'raw-text)))))
+ (condition-case () (delete-process server-process) (error nil)))
+ ;; Delete the socket files made by previous server invocations.
+ (condition-case ()
+ (delete-file (expand-file-name server-name server-socket-dir))
+ (error nil))
+ ;; If this Emacs already had a server, clear out associated status.
+ (while server-clients
+ (server-delete-client (car server-clients)))
+ (if leave-dead
+ (progn
+ (server-log (message "Server stopped"))
+ (setq server-process nil))
+ (if server-process
+ (server-log (message "Restarting server"))
+ (server-log (message "Starting server")))
+ (letf (((default-file-modes) ?\700))
+ (add-hook 'suspend-tty-functions 'server-handle-suspend-tty)
+ (add-hook 'delete-frame-functions 'server-handle-delete-frame)
+ (add-hook 'kill-buffer-query-functions 'server-kill-buffer-query-function)
+ (add-hook 'kill-emacs-query-functions 'server-kill-emacs-query-function)
+ (setq server-process
+ (make-network-process
+ :name "server" :family 'local :server t :noquery t
+ :service (expand-file-name server-name server-socket-dir)
+ :sentinel 'server-sentinel :filter 'server-process-filter
+ ;; We must receive file names without being decoded.
+ ;; Those are decoded by server-process-filter according
+ ;; to file-name-coding-system.
+ :coding 'raw-text))))))
;;;###autoload
(define-minor-mode server-mode
\f
(defun server-process-filter (proc string)
"Process a request from the server to edit some files.
-PROC is the server process. Format of STRING is \"PATH PATH PATH... \\n\"."
- (server-log string proc)
+PROC is the server process. STRING consists of a sequence of
+commands prefixed by a dash. Some commands have arguments; these
+are &-quoted and need to be decoded by `server-unquote-arg'. The
+filter parses and executes these commands.
+
+To illustrate the protocol, here is an example command that
+emacsclient sends to create a new X frame (note that the whole
+sequence is sent on a single line):
+
+ -version 21.3.50 xterm
+ -env HOME /home/lorentey
+ -env DISPLAY :0.0
+ ... lots of other -env commands
+ -display :0.0
+ -window-system
+
+The server normally sends back the single command `-good-version'
+as a response.
+
+The following commands are accepted by the server:
+
+`-version CLIENT-VERSION'
+ Check version numbers between server and client, and signal an
+ error if there is a mismatch. The server replies with
+ `-good-version' to confirm the match.
+
+`-env NAME VALUE'
+ An environment variable on the client side.
+
+`-nowait'
+ Request that the next frame created should not be
+ associated with this client.
+
+`-display DISPLAY'
+ Set the display name to open X frames on.
+
+`-position LINE[:COLUMN]'
+ Go to the given line and column number
+ in the next file opened.
+
+`-file FILENAME'
+ Load the given file in the current frame.
+
+`-eval EXPR'
+ Evaluate EXPR as a Lisp expression and return the
+ result in -print commands.
+
+`-window-system'
+ Open a new X frame.
+
+`-tty DEVICENAME TYPE'
+ Open a new tty frame at the client.
+
+`-resume'
+ Resume this tty frame. The client sends this string when it
+ gets the SIGCONT signal and it is the foreground process on its
+ controlling tty.
+
+`-suspend'
+ Suspend this tty frame. The client sends this string in
+ response to SIGTSTP and SIGTTOU. The server must cease all I/O
+ on this tty until it gets a -resume command.
+
+`-ignore COMMENT'
+ Do nothing, but put the comment in the server
+ log. Useful for debugging.
+
+
+The following commands are accepted by the client:
+
+`-good-version'
+ Signals a version match between the client and the server.
+
+`-emacs-pid PID'
+ Describes the process id of the Emacs process;
+ used to forward window change signals to it.
+
+`-window-system-unsupported'
+ Signals that the server does not
+ support creating X frames; the client must try again with a tty
+ frame.
+
+`-print STRING'
+ Print STRING on stdout. Used to send values
+ returned by -eval.
+
+`-error DESCRIPTION'
+ Signal an error (but continue processing).
+
+`-suspend'
+ Suspend this terminal, i.e., stop the client process. Sent
+ when the user presses C-z."
+ (server-log (concat "Received " string) proc)
(let ((prev (process-get proc 'previous-string)))
(when prev
(setq string (concat prev string))
(process-put proc 'previous-string nil)))
- ;; If the input is multiple lines,
- ;; process each line individually.
- (while (string-match "\n" string)
- (let ((request (substring string 0 (match-beginning 0)))
- (coding-system (and default-enable-multibyte-characters
- (or file-name-coding-system
- default-file-name-coding-system)))
- client nowait eval
- (files nil)
- (lineno 1)
- (tmp-frame nil) ; Sometimes used to embody the selected display.
- (columnno 0))
- ;; Remove this line from STRING.
- (setq string (substring string (match-end 0)))
- (setq client (cons proc nil))
- (while (string-match "[^ ]* " request)
- (let ((arg (substring request (match-beginning 0) (1- (match-end 0)))))
- (setq request (substring request (match-end 0)))
- (cond
- ((equal "-nowait" arg) (setq nowait t))
- ((equal "-eval" arg) (setq eval t))
- ((and (equal "-display" arg) (string-match "\\([^ ]*\\) " request))
- (let ((display (server-unquote-arg (match-string 1 request))))
- (setq request (substring request (match-end 0)))
- (condition-case err
- (setq tmp-frame (server-select-display display))
- (error (process-send-string proc (nth 1 err))
- (setq request "")))))
- ;; ARG is a line number option.
- ((string-match "\\`\\+[0-9]+\\'" arg)
- (setq lineno (string-to-number (substring arg 1))))
- ;; ARG is line number:column option.
- ((string-match "\\`+\\([0-9]+\\):\\([0-9]+\\)\\'" arg)
- (setq lineno (string-to-number (match-string 1 arg))
- columnno (string-to-number (match-string 2 arg))))
- (t
- ;; Undo the quoting that emacsclient does
- ;; for certain special characters.
- (setq arg (server-unquote-arg arg))
- ;; Now decode the file name if necessary.
- (if coding-system
- (setq arg (decode-coding-string arg coding-system)))
- (if eval
- (let ((v (eval (car (read-from-string arg)))))
- (when v
- (with-temp-buffer
- (let ((standard-output (current-buffer)))
- (pp v)
- ;; Suppress the error rose when the pipe to PROC is closed.
- (condition-case err
- (process-send-region proc (point-min) (point-max))
- (file-error nil)
- (error nil))
- ))))
- ;; ARG is a file name.
- ;; Collapse multiple slashes to single slashes.
- (setq arg (command-line-normalize-file-name arg))
- (push (list arg lineno columnno) files))
- (setq lineno 1)
- (setq columnno 0)))))
- (when files
- (run-hooks 'pre-command-hook)
- (server-visit-files files client nowait)
- (run-hooks 'post-command-hook))
- ;; CLIENT is now a list (CLIENTNUM BUFFERS...)
- (if (null (cdr client))
- ;; This client is empty; get rid of it immediately.
- (progn
- (delete-process proc)
- (server-log "Close empty client" proc))
- ;; We visited some buffer for this client.
- (or nowait (push client server-clients))
- (unless (or isearch-mode (minibufferp))
- (server-switch-buffer (nth 1 client))
- (run-hooks 'server-switch-hook)
- (unless nowait
- (message (substitute-command-keys
- "When done with a buffer, type \\[server-edit]")))))
- ;; Avoid preserving the connection after the last real frame is deleted.
- (if tmp-frame (delete-frame tmp-frame))))
- ;; Save for later any partial line that remains.
- (when (> (length string) 0)
- (process-put proc 'previous-string string)))
+ (condition-case err
+ (progn
+ (server-add-client proc)
+ ;; If the input is multiple lines,
+ ;; process each line individually.
+ (while (string-match "\n" string)
+ (let ((request (substring string 0 (match-beginning 0)))
+ (coding-system (and default-enable-multibyte-characters
+ (or file-name-coding-system
+ default-file-name-coding-system)))
+ (client (server-client proc))
+ nowait ; t if emacsclient does not want to wait for us.
+ frame ; The frame that was opened for the client (if any).
+ display ; Open the frame on this display.
+ dontkill ; t if the client should not be killed.
+ (files nil)
+ (lineno 1)
+ (columnno 0))
+ ;; Remove this line from STRING.
+ (setq string (substring string (match-end 0)))
+ (while (string-match " *[^ ]* " request)
+ (let ((arg (substring request (match-beginning 0) (1- (match-end 0)))))
+ (setq request (substring request (match-end 0)))
+ (cond
+ ;; -version CLIENT-VERSION:
+ ;; Check version numbers, signal an error if there is a mismatch.
+ ((and (equal "-version" arg)
+ (string-match "\\([0-9.]+\\) " request))
+ (let* ((client-version (match-string 1 request))
+ (truncated-emacs-version
+ (substring emacs-version 0 (length client-version))))
+ (setq request (substring request (match-end 0)))
+ (if (equal client-version truncated-emacs-version)
+ (progn
+ (server-send-string proc "-good-version \n")
+ (server-client-set client 'version client-version))
+ (error (concat "Version mismatch: Emacs is "
+ truncated-emacs-version
+ ", emacsclient is " client-version)))))
+
+ ;; -nowait: Emacsclient won't wait for a result.
+ ((equal "-nowait" arg) (setq nowait t))
+
+ ;; -display DISPLAY:
+ ;; Open X frames on the given instead of the default.
+ ((and (equal "-display" arg) (string-match "\\([^ ]*\\) " request))
+ (setq display (match-string 1 request)
+ request (substring request (match-end 0))))
+
+ ;; -window-system: Open a new X frame.
+ ((equal "-window-system" arg)
+ (unless (server-client-get client 'version)
+ (error "Protocol error; make sure to use the correct version of emacsclient"))
+ (if (fboundp 'x-create-frame)
+ (progn
+ (setq frame (make-frame-on-display
+ (or display
+ (frame-parameter nil 'device)
+ (getenv "DISPLAY")
+ (error "Please specify display"))
+ (list (cons 'client proc))))
+ ;; XXX We need to ensure the client parameter is
+ ;; really set because Emacs forgets initialization
+ ;; parameters for X frames at the moment.
+ (modify-frame-parameters frame (list (cons 'client proc)))
+ (select-frame frame)
+ (server-client-set client 'frame frame)
+ (server-client-set client 'device (frame-display frame))
+ (setq dontkill t))
+ ;; This emacs does not support X.
+ (server-log "Window system unsupported" proc)
+ (server-send-string proc "-window-system-unsupported \n")
+ (setq dontkill t)))
+
+ ;; -resume: Resume a suspended tty frame.
+ ((equal "-resume" arg)
+ (let ((device (server-client-get client 'device)))
+ (setq dontkill t)
+ (when (eq (display-live-p device) t)
+ (resume-tty device))))
+
+ ;; -suspend: Suspend the client's frame. (In case we
+ ;; get out of sync, and a C-z sends a SIGTSTP to
+ ;; emacsclient.)
+ ((equal "-suspend" arg)
+ (let ((device (server-client-get client 'device)))
+ (setq dontkill t)
+ (when (eq (display-live-p device) t)
+ (suspend-tty device))))
+
+ ;; -ignore COMMENT: Noop; useful for debugging emacsclient.
+ ;; (The given comment appears in the server log.)
+ ((and (equal "-ignore" arg) (string-match "\\([^ ]*\\) " request))
+ (setq dontkill t
+ request (substring request (match-end 0))))
+
+ ;; -tty DEVICE-NAME TYPE: Open a new tty frame at the client.
+ ((and (equal "-tty" arg) (string-match "\\([^ ]*\\) \\([^ ]*\\) " request))
+ (let ((tty (server-unquote-arg (match-string 1 request)))
+ (type (server-unquote-arg (match-string 2 request))))
+ (setq request (substring request (match-end 0)))
+ (unless (server-client-get client 'version)
+ (error "Protocol error; make sure you use the correct version of emacsclient"))
+ (server-with-client-environment proc
+ ("LANG" "LC_CTYPE" "LC_ALL"
+ ;; For tgetent(3); list according to ncurses(3).
+ "BAUDRATE" "COLUMNS" "ESCDELAY" "HOME" "LINES"
+ "NCURSES_ASSUMED_COLORS" "NCURSES_NO_PADDING"
+ "NCURSES_NO_SETBUF" "TERM" "TERMCAP" "TERMINFO"
+ "TERMINFO_DIRS" "TERMPATH")
+ (setq frame (make-frame-on-tty tty type
+ `((client . ,proc)))))
+ (select-frame frame)
+ (server-client-set client 'frame frame)
+ (server-client-set client 'tty (display-name frame))
+ (server-client-set client 'device (frame-display frame))
+
+ ;; Reply with our pid.
+ (server-send-string proc (concat "-emacs-pid " (number-to-string (emacs-pid)) "\n"))
+ (setq dontkill t)))
+
+ ;; -position LINE: Go to the given line in the next file.
+ ((and (equal "-position" arg) (string-match "\\(\\+[0-9]+\\) " request))
+ (setq request (substring request (match-end 0))
+ lineno (string-to-number (substring (match-string 1 request) 1))))
+
+ ;; -position LINE:COLUMN: Set point to the given position in the next file.
+ ((and (equal "-position" arg) (string-match "\\+\\([0-9]+\\):\\([0-9]+\\) " request))
+ (setq lineno (string-to-number (match-string 1 request))
+ columnno (string-to-number (match-string 2 request))
+ request (substring request (match-end 0))))
+
+ ;; -file FILENAME: Load the given file.
+ ((and (equal "-file" arg) (string-match "\\([^ ]+\\) " request))
+ (let ((file (server-unquote-arg (match-string 1 request))))
+ (setq request (substring request (match-end 0)))
+ (if coding-system
+ (setq file (decode-coding-string file coding-system)))
+ (setq file (command-line-normalize-file-name file))
+ (push (list file lineno columnno) files))
+ (setq lineno 1
+ columnno 0))
+
+ ;; -eval EXPR: Evaluate a Lisp expression.
+ ((and (equal "-eval" arg) (string-match "\\([^ ]+\\) " request))
+ (let ((expr (server-unquote-arg (match-string 1 request))))
+ (setq request (substring request (match-end 0)))
+ (if coding-system
+ (setq expr (decode-coding-string expr coding-system)))
+ (let ((v (eval (car (read-from-string expr)))))
+ (when (and (not frame) v)
+ (with-temp-buffer
+ (let ((standard-output (current-buffer)))
+ (pp v)
+ (server-send-string
+ proc (format "-print %s\n"
+ (server-quote-arg
+ (buffer-substring-no-properties (point-min)
+ (point-max)))))))))
+ (setq lineno 1
+ columnno 0)))
+
+ ;; -env NAME VALUE: An environment variable.
+ ((and (equal "-env" arg) (string-match "\\([^ ]+\\) \\([^ ]+\\) " request))
+ (let ((name (server-unquote-arg (match-string 1 request)))
+ (value (server-unquote-arg (match-string 2 request))))
+ (when coding-system
+ (setq name (decode-coding-string name coding-system))
+ (setq value (decode-coding-string value coding-system)))
+ (setq request (substring request (match-end 0)))
+ (server-client-set
+ client 'environment
+ (cons (cons name value)
+ (server-client-get client 'environment)))))
+
+ ;; Unknown command.
+ (t (error "Unknown command: %s" arg)))))
+
+ (let (buffers)
+ (when files
+ (run-hooks 'pre-command-hook)
+ (setq buffers (server-visit-files files client nowait))
+ (run-hooks 'post-command-hook))
+
+ ;; Delete the client if necessary.
+ (cond
+ (nowait
+ ;; Client requested nowait; return immediately.
+ (server-log "Close nowait client" proc)
+ (server-delete-client proc))
+ ((and (not dontkill) (null buffers))
+ ;; This client is empty; get rid of it immediately.
+ (server-log "Close empty client" proc)
+ (server-delete-client proc)))
+ (cond
+ ((or isearch-mode (minibufferp))
+ nil)
+ ((and frame (null buffers))
+ (message (substitute-command-keys
+ "When done with this frame, type \\[delete-frame]")))
+ ((not (null buffers))
+ (server-switch-buffer (car buffers))
+ (run-hooks 'server-switch-hook)
+ (unless nowait
+ (message (substitute-command-keys
+ "When done with a buffer, type \\[server-edit]"))))))))
+
+ ;; Save for later any partial line that remains.
+ (when (> (length string) 0)
+ (process-put proc 'previous-string string)))
+ ;; condition-case
+ (error (ignore-errors
+ (server-send-string
+ proc (concat "-error " (server-quote-arg (error-message-string err))))
+ (setq string "")
+ (server-log (error-message-string err) proc)
+ (delete-process proc)))))
(defun server-goto-line-column (file-line-col)
+ "Move point to the position indicated in FILE-LINE-COL.
+FILE-LINE-COL should be a three-element list as described in
+`server-visit-files'."
(goto-line (nth 1 file-line-col))
(let ((column-number (nth 2 file-line-col)))
(if (> column-number 0)
(move-to-column (1- column-number)))))
(defun server-visit-files (files client &optional nowait)
- "Find FILES and return the list CLIENT with the buffers nconc'd.
+ "Find FILES and return a list of buffers created.
FILES is an alist whose elements are (FILENAME LINENUMBER COLUMNNUMBER).
+CLIENT is the client that requested this operation.
NOWAIT non-nil means this client is not waiting for the results,
so don't mark these buffers specially, just visit them normally."
;; Bind last-nonmenu-event to force use of keyboard, not mouse, for queries.
(revert-buffer t nil)))
(t
(if (y-or-n-p
- (concat "File no longer exists: "
- filen
+ (concat "File no longer exists: " filen
", write buffer to file? "))
(write-file filen))))
(setq server-existing-buffer t)
(add-hook 'kill-buffer-hook 'server-kill-buffer nil t)
(push (car client) server-buffer-clients))
(push (current-buffer) client-record)))
- (nconc client client-record)))
+ (unless nowait
+ (server-client-set
+ client 'buffers
+ (nconc (server-client-get client 'buffers) client-record)))
+ client-record))
\f
(defun server-buffer-done (buffer &optional for-killing)
"Mark BUFFER as \"done\" for its client(s).
a temp file).
FOR-KILLING if non-nil indicates that we are called from `kill-buffer'."
(let ((next-buffer nil)
- (killed nil)
- (old-clients server-clients))
- (while old-clients
- (let ((client (car old-clients)))
+ (killed nil))
+ (dolist (client server-clients)
+ (let ((buffers (server-client-get client 'buffers)))
(or next-buffer
- (setq next-buffer (nth 1 (memq buffer client))))
- (delq buffer client)
- ;; Delete all dead buffers from CLIENT.
- (let ((tail client))
- (while tail
- (and (bufferp (car tail))
- (null (buffer-name (car tail)))
- (delq (car tail) client))
- (setq tail (cdr tail))))
- ;; If client now has no pending buffers,
- ;; tell it that it is done, and forget it entirely.
- (unless (cdr client)
- (delete-process (car client))
- (server-log "Close" (car client))
- (setq server-clients (delq client server-clients))))
- (setq old-clients (cdr old-clients)))
+ (setq next-buffer (nth 1 (memq buffer buffers))))
+ (when buffers ; Ignore bufferless clients.
+ (setq buffers (delq buffer buffers))
+ ;; Delete all dead buffers from CLIENT.
+ (dolist (b buffers)
+ (and (bufferp b)
+ (not (buffer-live-p b))
+ (setq buffers (delq b buffers))))
+ (server-client-set client 'buffers buffers)
+ ;; If client now has no pending buffers,
+ ;; tell it that it is done, and forget it entirely.
+ (unless buffers
+ (server-log "Close" client)
+ (server-delete-client client)))))
(if (and (bufferp buffer) (buffer-name buffer))
;; We may or may not kill this buffer;
;; if we do, do not call server-buffer-done recursively
;; but I think that is dangerous--the client would proceed
;; using whatever is on disk in that file. -- rms.
(defun server-kill-buffer-query-function ()
+ "Ask before killing a server buffer."
(or (not server-buffer-clients)
+ (let ((res t))
+ (dolist (proc server-buffer-clients res)
+ (let ((client (server-client proc)))
+ (when (and client (eq (process-status proc) 'open))
+ (setq res nil)))))
(yes-or-no-p (format "Buffer `%s' still has clients; kill it? "
(buffer-name (current-buffer))))))
-(add-hook 'kill-buffer-query-functions
- 'server-kill-buffer-query-function)
-
(defun server-kill-emacs-query-function ()
- (let (live-client
- (tail server-clients))
- ;; See if any clients have any buffers that are still alive.
- (while tail
- (if (memq t (mapcar 'stringp (mapcar 'buffer-name (cdr (car tail)))))
- (setq live-client t))
- (setq tail (cdr tail)))
- (or (not live-client)
- (yes-or-no-p "Server buffers still have clients; exit anyway? "))))
-
-(add-hook 'kill-emacs-query-functions 'server-kill-emacs-query-function)
+ "Ask before exiting Emacs it has live clients."
+ (or (not server-clients)
+ (let (live-client)
+ (dolist (client server-clients live-client)
+ (if (memq t (mapcar 'buffer-live-p (server-client-get
+ client 'buffers)))
+ (setq live-client t))))
+ (yes-or-no-p "This Emacs session has clients; exit anyway? ")))
(defvar server-kill-buffer-running nil
"Non-nil while `server-kill-buffer' or `server-buffer-done' is running.")
(defun server-kill-buffer ()
+ "Remove the current buffer from its clients' buffer list.
+Designed to be added to `kill-buffer-hook'."
;; Prevent infinite recursion if user has made server-done-hook
;; call kill-buffer.
(or server-kill-buffer-running
(defun server-switch-buffer (&optional next-buffer killed-one)
"Switch to another buffer, preferably one that has a client.
-Arg NEXT-BUFFER is a suggestion; if it is a live buffer, use it."
- ;; KILLED-ONE is t in a recursive call
- ;; if we have already killed one temp-file server buffer.
- ;; This means we should avoid the final "switch to some other buffer"
- ;; since we've already effectively done that.
+Arg NEXT-BUFFER is a suggestion; if it is a live buffer, use it.
+
+KILLED-ONE is t in a recursive call if we have already killed one
+temp-file server buffer. This means we should avoid the final
+\"switch to some other buffer\" since we've already effectively
+done that."
(if (null next-buffer)
- (if server-clients
- (server-switch-buffer (nth 1 (car server-clients)) killed-one)
- (unless (or killed-one (window-dedicated-p (selected-window)))
- (switch-to-buffer (other-buffer))
+ (progn
+ (let ((rest server-clients))
+ (while (and rest (not next-buffer))
+ (let ((client (car rest)))
+ ;; Only look at frameless clients.
+ (when (not (server-client-get client 'frame))
+ (setq next-buffer (car (server-client-get client 'buffers))))
+ (setq rest (cdr rest)))))
+ (and next-buffer (server-switch-buffer next-buffer killed-one))
+ (unless (or next-buffer killed-one (window-dedicated-p (selected-window)))
+ ;; (switch-to-buffer (other-buffer))
(message "No server buffers remain to edit")))
- (if (not (buffer-name next-buffer))
+ (if (not (buffer-live-p next-buffer))
;; If NEXT-BUFFER is a dead buffer, remove the server records for it
;; and try the next surviving server buffer.
(apply 'server-switch-buffer (server-buffer-done next-buffer))
(get-window-with-predicate
(lambda (w)
(and (not (window-dedicated-p w))
- (equal (frame-parameter (window-frame w) 'display)
- (frame-parameter (selected-frame) 'display))))
+ (equal (frame-parameter (window-frame w) 'device)
+ (frame-parameter (selected-frame) 'device))))
'nomini 'visible (selected-window))))
(condition-case nil
(switch-to-buffer next-buffer)
;; a minibuffer/dedicated-window (if there's no other).
(error (pop-to-buffer next-buffer)))))))))
+(defun server-save-buffers-kill-display (&optional arg)
+ "Offer to save each buffer, then kill the current connection.
+If the current frame has no client, kill Emacs itself.
+
+With prefix arg, silently save all file-visiting buffers, then kill.
+
+If emacsclient was started with a list of filenames to edit, then
+only these files will be asked to be saved."
+ (interactive "P")
+ (let ((proc (frame-parameter (selected-frame) 'client)))
+ (if proc
+ (let ((buffers (server-client-get proc 'buffers)))
+ ;; If client is bufferless, emulate a normal Emacs session
+ ;; exit and offer to save all buffers. Otherwise, offer to
+ ;; save only the buffers belonging to the client.
+ (save-some-buffers arg
+ (if buffers
+ (lambda () (memq (current-buffer) buffers))
+ t))
+ (server-delete-client proc))
+ (save-buffers-kill-emacs))))
+
(define-key ctl-x-map "#" 'server-edit)
(defun server-unload-hook ()
+ "Unload the server library."
(server-start t)
+ (remove-hook 'suspend-tty-functions 'server-handle-suspend-tty)
+ (remove-hook 'delete-frame-functions 'server-handle-delete-frame)
(remove-hook 'kill-buffer-query-functions 'server-kill-buffer-query-function)
(remove-hook 'kill-emacs-query-functions 'server-kill-emacs-query-function)
(remove-hook 'kill-buffer-hook 'server-kill-buffer))