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+;;; resume.el --- process command line args from within a suspended Emacs job
+
+;; Copyright (C) 1992, 2001, 2002, 2003, 2004, 2005,
+;;   2006, 2007, 2008 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 3 of the License, 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.  If not, see <http://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;; This file has been obsolete since Emacs 23.1.
+
+;; The purpose of this library is to handle command line arguments
+;; when you resume an existing Emacs job.
+
+;; In order to use it, you must put this code in your .emacs file.
+
+;; (add-hook 'suspend-hook 'resume-suspend-hook)
+;; (add-hook 'suspend-resume-hook 'resume-process-args)
+
+;; You can't get the benefit of this library by using the `emacs' command,
+;; since that always starts a new Emacs job.  Instead you must use a
+;; command called `edit' which knows how to resume an existing Emacs job
+;; if you have one, or start a new Emacs job if you don't have one.
+
+;; To define the `edit' command, run the script etc/emacs.csh (if you use CSH),
+;; or etc/emacs.bash if you use BASH.  You would normally do this in your
+;; login script.
+
+;; Stephan Gildea suggested bug fix (gildea@bbn.com).
+;; Ideas from Michael DeCorte and other people.
+
+;;; 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)
+
+;; arch-tag: c90b2761-4803-4e58-a0ae-c4721368b628
+;;; resume.el ends here