-;; process command line arguments from within a suspended emacs job
-;; Copyright (C) 1988 Free Software Foundation, Inc.
-
-;; This file is not yet part of GNU Emacs, but soon will be.
-
-;; GNU Emacs is distributed in the hope that it will be useful,
-;; but WITHOUT ANY WARRANTY. No author or distributor
-;; accepts responsibility to anyone for the consequences of using it
-;; or for whether it serves any particular purpose or works at all,
-;; unless he says so in writing. Refer to the GNU Emacs General Public
-;; License for full details.
-
-;; Everyone is granted permission to copy, modify and redistribute
-;; GNU Emacs, but only under the conditions described in the
-;; GNU Emacs General Public License. A copy of this license is
-;; supposed to have been given to you along with GNU Emacs so you
-;; can know your rights and responsibilities. It should be in a
-;; file named COPYING. Among other things, the copyright notice
-;; and this notice must be preserved on all copies.
-;;
-;; by Joe Wells
-;; jbw@bucsf.bu.edu
-;; joew@uswat.uswest.com (maybe, ... the mailer there sucks)
-
-;; Stephan Gildea suggested bug fix (gildea@bbn.com).
-;; Ideas from Michael DeCorte and other people.
-
-;; For csh users, insert the following alias in your .cshrc file
-;; (after removing the leading double semicolons):
-;;
-;;# The following line could be just EMACS=emacs, but this depends on
-;;# your site.
-;;set EMACS=emacs
-;;set EMACS_PATTERN="^\[[0-9]\] . Stopped ............ $EMACS"
-;;alias emacs \
-;;' \\
-;; jobs >! /tmp/jobs$$ \\
-;; && grep "$EMACS_PATTERN" /tmp/jobs$$ >& /dev/null \\
-;; && echo `pwd` \!* >! ~/.emacs_args && eval "%$EMACS" \\
-;;|| test -S ~/.emacs_server && emacsclient \!* \\
-;;|| test "$?DISPLAY" = 1 && eval "\$EMACS -i \!* &" \\
-;;|| test "$?WINDOW_PARENT" = 1 && eval "emacstool -f emacstool-init \!* &" \\
-;;|| eval "\$EMACS -nw \!*"'
-;;
-;; The alias works as follows:
-;; 1. If there is a suspended emacs jobs that is a child of the
-;; current shell, place its arguments in the ~/.emacs_args file and
-;; resume it.
-;; 2. Else if the ~/.emacs_server socket has been created, presume an
-;; emacs server is running and attempt to connect to it. If no emacs
-;; server is listening on the socket, this will fail.
-;; 3. Else if the DISPLAY environment variable is set, presume we are
-;; running under X Windows and start a new X Gnu Emacs process in the
-;; background.
-;; 4. Else if the WINDOW_PARENT environment variable is set, presume we
-;; are running under Sunview and Suntools and start an emacstool
-;; process in the background.
-;; 5. Else start a regular emacs process.
-;;
-;; Notes:
-;; "test -S" checks if a unix domain socket by that name exists.
-;; The output of the "jobs" command is not piped directly into "grep"
-;; because that would run the "jobs" command in a subshell.
-;; Before resuming a suspended emacs, the current directory and all
-;; command line arguments are placed in a file.
-;; The command to run emacs is always preceded by a \ to prevent
-;; possible alias loops.
-;; The "-nw" switch in the last line is is undocumented, and it means
-;; no windowing system.
-\f
-(setq suspend-resume-hook 'resume-process-args)
-(setq suspend-hook 'resume-preparation)
-
-(defvar emacs-args-file "~/.emacs_args"
- "*This file is where arguments are placed for a suspended emacs job.")
-
-(defun resume-preparation ()
- (condition-case ()
- (delete-file emacs-args-file)
- (error nil)))
-
-(defun resume-process-args ()
- "This should be called from inside of suspend-resume-hook.
-Grabs the contents of the file whose name is stored in
-emacs-args-file, and processes these arguments like command line options."
- (let ((resume-start-buffer (current-buffer))
- (resume-args-buffer (get-buffer-create " *Command Line Args*"))
- resume-args)
- (unwind-protect
- (progn
- (set-buffer resume-args-buffer)
- (erase-buffer)
- ;; Get the contents of emacs-args-file, then delete the file.
- (condition-case ()
- (progn
- (insert-file-contents emacs-args-file)
- (delete-file emacs-args-file))
- ;; The file doesn't exist or we can't delete it, ergo no arguments.
- ;; (If we can't delete it now, we probably couldn't delete it
- ;; before suspending, and that implies it may be vestigial.)
- (file-error (erase-buffer)))
- ;; Get the arguments from the buffer.
- (goto-char (point-min))
- (while (progn (skip-chars-forward " \t\n") (not (eobp)))
- (setq resume-args
- (cons (buffer-substring (point)
- (progn
- (skip-chars-forward "^ \t\n")
- (point)))
- resume-args)))
- (cond (resume-args
- ;; Arguments are now in reverse order.
- (setq resume-args (nreverse resume-args))
- ;; The "first argument" is really a default directory to use
- ;; while processing the rest of the arguments.
- (setq default-directory (concat (car resume-args) "/"))
- ;; Actually process the arguments.
- (command-line-1 (cdr resume-args)))))
- ;; If the command line args don't result in a find-file, the
- ;; buffer will be left in resume-args-buffer. So we change back to the
- ;; original buffer. The reason I don't just use
- ;; (let ((default-directory foo))
- ;; (command-line-1 args))
- ;; in the context of the original buffer is because let does not
- ;; work properly with buffer-local variables.
- (if (eq (current-buffer) resume-args-buffer)
- (set-buffer resume-start-buffer)))))
+;;; resume.el --- process command line args from within a suspended Emacs job
+
+;; Copyright (C) 1992 Free Software Foundation, Inc.
+
+;; Author: Joe Wells <jbw@bucsf.bu.edu>
+;; Adapted-By: ESR
+;; Keywords: processes
+
+;; This file is part of GNU Emacs.
+
+;; GNU Emacs is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation; either version 2, or (at your option)
+;; any later version.
+
+;; GNU Emacs is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with GNU Emacs; see the file COPYING. If not, write to
+;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+
+;;; Commentary:
+
+;; Theory: the first time you start Emacs, command line arguments are
+;; handled normally. Then, you suspend your emacs job. When you want to edit
+;; something else, you type "emacs filename" as usual, but instead of
+;; starting a new emacs job, the old job is resumed instead, and the command
+;; line arguments are placed in a file where the old emacs job looks for
+;; them.
+
+;; Stephan Gildea suggested bug fix (gildea@bbn.com).
+;; Ideas from Michael DeCorte and other people.
+
+;; For csh users, insert the following alias in your .cshrc file
+;; (after removing the leading double semicolons, of course):
+;;
+;;# The following line could be just EMACS_CMD=emacs, but this depends on
+;;# your site.
+;;if (! $?EMACS_CMD) set EMACS_CMD=emacs
+;;set JOBS_FILE=/tmp/jobs.$USER.$$
+;;set ARGS_FILE=~/.emacs_args
+;;set STOP_PATT='^\[[0-9]*\] *[ +-] Stopped ............ '
+;;set SUNVIEW_CMD='emacstool -nw -f emacstool-init -f server-start'
+;;set X_CMD=\'\''$EMACS_CMD -i -f server-start'
+;;alias emacs \
+;;' \\
+;; jobs >! "$JOBS_FILE" \\
+;; && grep "$STOP_PATT$EMACS_CMD" "$JOBS_FILE" >& /dev/null \\
+;; && echo `pwd` \!* >! "$ARGS_FILE" && ""fg %$EMACS_CMD \\
+;;|| if (! -e ~/.emacs_server || -f ~/.emacs_server) set status=1 \\
+;; && emacsclient \!* \\
+;;|| @ status=1 - $?DISPLAY && eval "$X_CMD -i \!* &" \\
+;;|| @ status=1 - $?WINDOW_PARENT && eval "$SUNVIEW_CMD \!* &" \\
+;;|| ""$EMACS_CMD -nw \!* \\
+;;'
+;;
+;; The alias works as follows:
+;; 1. If there is a suspended Emacs job that is a child of the
+;; current shell, place its arguments in the ~/.emacs_args file and
+;; resume it.
+;; 2. Else if the ~/.emacs_server socket has been created, presume an
+;; Emacs server is running and attempt to connect to it. If no Emacs
+;; server is listening on the socket, this will fail.
+;; 3. Else if the DISPLAY environment variable is set, presume we are
+;; running under X Windows and start a new GNU Emacs process in the
+;; background as an X client.
+;; 4. Else if the WINDOW_PARENT environment variable is set, presume we
+;; are running under SunView and start an emacstool process in the
+;; background.
+;; 5. Else start a regular Emacs process.
+;;
+;; Notes:
+;; The output of the "jobs" command is not piped directly into "grep"
+;; because that would run the "jobs" command in a subshell.
+;; Before resuming a suspended emacs, the current directory and all
+;; command line arguments are placed in a file name ~/.emacs_args.
+;; The "-nw" switch to Emacs means no windowing system.
+
+;; Insert this in your .emacs file:
+;;(add-hook 'suspend-hook 'resume-suspend-hook)
+
+;; Finally, put the rest in a file named "resume.el" in a lisp library
+;; directory.
+
+;;; Code:
+
+(defvar resume-emacs-args-file (expand-file-name "~/.emacs_args")
+ "*This file is where arguments are placed for a suspended emacs job.")
+
+(defvar resume-emacs-args-buffer " *Command Line Args*"
+ "Buffer that is used by resume-process-args.")
+
+(defun resume-process-args ()
+ "Handler for command line args given when Emacs is resumed."
+ (let ((start-buffer (current-buffer))
+ (args-buffer (get-buffer-create resume-emacs-args-buffer))
+ length args
+ (command-line-default-directory default-directory))
+ (unwind-protect
+ (progn
+ (set-buffer args-buffer)
+ (erase-buffer)
+ ;; get the contents of resume-emacs-args-file
+ (condition-case ()
+ (let ((result (insert-file-contents resume-emacs-args-file)))
+ (setq length (car (cdr result))))
+ ;; the file doesn't exist, ergo no arguments
+ (file-error
+ (erase-buffer)
+ (setq length 0)))
+ (if (<= length 0)
+ (setq args nil)
+ ;; get the arguments from the buffer
+ (goto-char (point-min))
+ (while (not (eobp))
+ (skip-chars-forward " \t\n")
+ (let ((begin (point)))
+ (skip-chars-forward "^ \t\n")
+ (setq args (cons (buffer-substring begin (point)) args)))
+ (skip-chars-forward " \t\n"))
+ ;; arguments are now in reverse order
+ (setq args (nreverse args))
+ ;; make sure they're not read again
+ (erase-buffer))
+ (resume-write-buffer-to-file (current-buffer) resume-emacs-args-file)
+ ;; if nothing was in buffer, args will be null
+ (or (null args)
+ (setq command-line-default-directory
+ (file-name-as-directory (car args))
+ args (cdr args)))
+ ;; actually process the arguments
+ (command-line-1 args))
+ ;; If the command line args don't result in a find-file, the
+ ;; buffer will be left in args-buffer. So we change back to the
+ ;; original buffer. The reason I don't just use
+ ;; (let ((default-directory foo))
+ ;; (command-line-1 args))
+ ;; in the context of the original buffer is because let does not
+ ;; work properly with buffer-local variables.
+ (if (eq (current-buffer) args-buffer)
+ (set-buffer start-buffer)))))
+
+;;;###autoload
+(defun resume-suspend-hook ()
+ "Clear out the file used for transmitting args when Emacs resumes."
+ (save-excursion
+ (set-buffer (get-buffer-create resume-emacs-args-buffer))
+ (erase-buffer)
+ (resume-write-buffer-to-file (current-buffer) resume-emacs-args-file)))
+
+(defun resume-write-buffer-to-file (buffer file)
+ "Writes the contents of BUFFER into FILE, if permissions allow."
+ (if (not (file-writable-p file))
+ (error "No permission to write file %s" file))
+ (save-excursion
+ (set-buffer buffer)
+ (clear-visited-file-modtime)
+ (save-restriction
+ (widen)
+ (write-region (point-min) (point-max) file nil 'quiet))
+ (set-buffer-modified-p nil)))
+
+(provide 'resume)
+
+;;; resume.el ends here
HCoop / bpt / emacs.git / blobdiff