X-Git-Url: https://git.hcoop.net/bpt/emacs.git/blobdiff_plain/c88ab9ce4a0dbacb1f5bd272c1e7419f1e0f4b9d..739d627a477191703f57ca4cfbd1bf8dc25625f9:/lisp/resume.el diff --git a/lisp/resume.el b/lisp/resume.el dissimilarity index 68% index 3ca6dc892d..8d9232b2f2 100644 --- a/lisp/resume.el +++ b/lisp/resume.el @@ -1,162 +1,130 @@ -;;; resume.el --- process command line args 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. - -;; Created by: Joe Wells, jbw@bucsf.bu.edu -;; Created on: 1988? -;; Last modified by: Joe Wells, jbw@dodge -;; Last modified on: Thu Jun 14 15:20:41 1990 -;; Filename: resume.el -;; Purpose: handle command line arguments when resuming suspended job - -;; Stephen 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: -;;(setq suspend-resume-hook 'resume-process-args) -;;(setq suspend-hook 'empty-args-file) -;;(autoload 'empty-args-file "resume") -;;(autoload 'resume-process-args "resume") - -;; Finally, put the rest in a file named "resume.el" in a lisp library -;; directory. - -(defvar emacs-args-file (expand-file-name "~/.emacs_args") - "*This file is where arguments are placed for a suspended emacs job.") - -(defvar emacs-args-buffer " *Command Line Args*" - "Buffer that is used by resume-process-args.") - -(defun resume-process-args () - "This should be called from inside of `suspend-resume-hook'. -This grabs the contents of the file whose name is stored in `emacs-args-file', -and processes these arguments like command line options." - (let ((start-buffer (current-buffer)) - (args-buffer (get-buffer-create emacs-args-buffer)) - length args) - (unwind-protect - (progn - (set-buffer args-buffer) - (erase-buffer) - ;; get the contents of emacs-args-file - (condition-case () - (let ((result (insert-file-contents 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)) - (write-buffer-to-file (current-buffer) emacs-args-file) - ;; if nothing was in buffer, args will be null - (or (null args) - (setq 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))))) - -(defun empty-args-file () - "This empties the contents of the file whose name is specified by -`emacs-args-file'." - (save-excursion - (set-buffer (get-buffer-create emacs-args-buffer)) - (erase-buffer) - (write-buffer-to-file (current-buffer) emacs-args-file))) - -(defun 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))) - -;;; resume.el ends here +;;; 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 +;; 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, 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, Inc., 51 Franklin Street, Fifth Floor, +;; Boston, MA 02110-1301, USA. + +;;; Commentary: + +;; 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