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;; 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.
(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)))))
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