125 lines
4.5 KiB
EmacsLisp
125 lines
4.5 KiB
EmacsLisp
;;; resume.el --- process command line args from within a suspended Emacs job
|
|
|
|
;; Copyright (C) 1992, 2001-2016 Free Software Foundation, Inc.
|
|
|
|
;; Author: Joe Wells <jbw@bucsf.bu.edu>
|
|
;; Adapted-By: ESR
|
|
;; Keywords: processes
|
|
;; Obsolete-since: 23.1
|
|
|
|
;; 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:
|
|
|
|
;; 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."
|
|
(with-current-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))
|
|
(with-current-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
|