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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)))))