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129 lines
4.6 KiB
EmacsLisp
129 lines
4.6 KiB
EmacsLisp
;;; resume.el --- process command line args from within a suspended Emacs job
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;; Copyright (C) 1992 Free Software Foundation, Inc.
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;; Author: Joe Wells <jbw@bucsf.bu.edu>
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;; Adapted-By: ESR
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;; Keywords: processes
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation; either version 2, or (at your option)
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;; any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs; see the file COPYING. If not, write to the
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;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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;; Boston, MA 02111-1307, USA.
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;;; Commentary:
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;; The purpose of this library is to handle command line arguments
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;; when you resume an existing Emacs job.
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;; In order to use it, you must put this code in your .emacs file.
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;; (add-hook 'suspend-hook 'resume-suspend-hook)
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;; (add-hook 'suspend-resume-hook 'resume-process-args)
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;; You can't get the benefit of this library by using the `emacs' command,
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;; since that always starts a new Emacs job. Instead you must use a
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;; command called `edit' which knows how to resume an existing Emacs job
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;; if you have one, or start a new Emacs job if you don't have one.
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;; To define the `edit' command, run the script etc/emacs.csh (if you use CSH),
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;; or etc/emacs.bash if you use BASH. You would normally do this in your
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;; login script.
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;; Stephan Gildea suggested bug fix (gildea@bbn.com).
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;; Ideas from Michael DeCorte and other people.
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;;; Code:
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(defvar resume-emacs-args-file (expand-file-name "~/.emacs_args")
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"*This file is where arguments are placed for a suspended emacs job.")
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(defvar resume-emacs-args-buffer " *Command Line Args*"
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"Buffer that is used by resume-process-args.")
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(defun resume-process-args ()
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"Handler for command line args given when Emacs is resumed."
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(let ((start-buffer (current-buffer))
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(args-buffer (get-buffer-create resume-emacs-args-buffer))
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length args
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(command-line-default-directory default-directory))
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(unwind-protect
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(progn
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(set-buffer args-buffer)
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(erase-buffer)
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;; get the contents of resume-emacs-args-file
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(condition-case ()
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(let ((result (insert-file-contents resume-emacs-args-file)))
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(setq length (car (cdr result))))
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;; the file doesn't exist, ergo no arguments
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(file-error
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(erase-buffer)
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(setq length 0)))
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(if (<= length 0)
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(setq args nil)
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;; get the arguments from the buffer
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(goto-char (point-min))
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(while (not (eobp))
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(skip-chars-forward " \t\n")
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(let ((begin (point)))
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(skip-chars-forward "^ \t\n")
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(setq args (cons (buffer-substring begin (point)) args)))
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(skip-chars-forward " \t\n"))
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;; arguments are now in reverse order
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(setq args (nreverse args))
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;; make sure they're not read again
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(erase-buffer))
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(resume-write-buffer-to-file (current-buffer) resume-emacs-args-file)
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;; if nothing was in buffer, args will be null
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(or (null args)
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(setq command-line-default-directory
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(file-name-as-directory (car args))
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args (cdr args)))
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;; actually process the arguments
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(command-line-1 args))
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;; If the command line args don't result in a find-file, the
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;; buffer will be left in args-buffer. So we change back to the
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;; original buffer. The reason I don't just use
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;; (let ((default-directory foo))
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;; (command-line-1 args))
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;; in the context of the original buffer is because let does not
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;; work properly with buffer-local variables.
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(if (eq (current-buffer) args-buffer)
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(set-buffer start-buffer)))))
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;;;###autoload
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(defun resume-suspend-hook ()
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"Clear out the file used for transmitting args when Emacs resumes."
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(save-excursion
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(set-buffer (get-buffer-create resume-emacs-args-buffer))
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(erase-buffer)
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(resume-write-buffer-to-file (current-buffer) resume-emacs-args-file)))
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(defun resume-write-buffer-to-file (buffer file)
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"Writes the contents of BUFFER into FILE, if permissions allow."
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(if (not (file-writable-p file))
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(error "No permission to write file %s" file))
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(save-excursion
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(set-buffer buffer)
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(clear-visited-file-modtime)
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(save-restriction
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(widen)
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(write-region (point-min) (point-max) file nil 'quiet))
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(set-buffer-modified-p nil)))
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(provide 'resume)
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;;; resume.el ends here
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