1
;;; resume.el --- process command line args from within a suspended Emacs job
3
;; Copyright (C) 1992, 2001, 2002, 2003, 2004, 2005,
4
;; 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
6
;; Author: Joe Wells <jbw@bucsf.bu.edu>
10
;; This file is part of GNU Emacs.
12
;; GNU Emacs is free software: you can redistribute it and/or modify
13
;; it under the terms of the GNU General Public License as published by
14
;; the Free Software Foundation, either version 3 of the License, or
15
;; (at your option) any later version.
17
;; GNU Emacs is distributed in the hope that it will be useful,
18
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
19
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20
;; GNU General Public License for more details.
22
;; You should have received a copy of the GNU General Public License
23
;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
27
;; This file has been obsolete since Emacs 23.1.
29
;; The purpose of this library is to handle command line arguments
30
;; when you resume an existing Emacs job.
32
;; In order to use it, you must put this code in your .emacs file.
34
;; (add-hook 'suspend-hook 'resume-suspend-hook)
35
;; (add-hook 'suspend-resume-hook 'resume-process-args)
37
;; You can't get the benefit of this library by using the `emacs' command,
38
;; since that always starts a new Emacs job. Instead you must use a
39
;; command called `edit' which knows how to resume an existing Emacs job
40
;; if you have one, or start a new Emacs job if you don't have one.
42
;; To define the `edit' command, run the script etc/emacs.csh (if you use CSH),
43
;; or etc/emacs.bash if you use BASH. You would normally do this in your
46
;; Stephan Gildea suggested bug fix (gildea@bbn.com).
47
;; Ideas from Michael DeCorte and other people.
51
(defvar resume-emacs-args-file (expand-file-name "~/.emacs_args")
52
"*This file is where arguments are placed for a suspended Emacs job.")
54
(defvar resume-emacs-args-buffer " *Command Line Args*"
55
"Buffer that is used by `resume-process-args'.")
57
(defun resume-process-args ()
58
"Handler for command line args given when Emacs is resumed."
59
(let ((start-buffer (current-buffer))
60
(args-buffer (get-buffer-create resume-emacs-args-buffer))
62
(command-line-default-directory default-directory))
65
(set-buffer args-buffer)
67
;; get the contents of resume-emacs-args-file
69
(let ((result (insert-file-contents resume-emacs-args-file)))
70
(setq length (car (cdr result))))
71
;; the file doesn't exist, ergo no arguments
77
;; get the arguments from the buffer
78
(goto-char (point-min))
80
(skip-chars-forward " \t\n")
81
(let ((begin (point)))
82
(skip-chars-forward "^ \t\n")
83
(setq args (cons (buffer-substring begin (point)) args)))
84
(skip-chars-forward " \t\n"))
85
;; arguments are now in reverse order
86
(setq args (nreverse args))
87
;; make sure they're not read again
89
(resume-write-buffer-to-file (current-buffer) resume-emacs-args-file)
90
;; if nothing was in buffer, args will be null
92
(setq command-line-default-directory
93
(file-name-as-directory (car args))
95
;; actually process the arguments
96
(command-line-1 args))
97
;; If the command line args don't result in a find-file, the
98
;; buffer will be left in args-buffer. So we change back to the
99
;; original buffer. The reason I don't just use
100
;; (let ((default-directory foo))
101
;; (command-line-1 args))
102
;; in the context of the original buffer is because let does not
103
;; work properly with buffer-local variables.
104
(if (eq (current-buffer) args-buffer)
105
(set-buffer start-buffer)))))
108
(defun resume-suspend-hook ()
109
"Clear out the file used for transmitting args when Emacs resumes."
111
(set-buffer (get-buffer-create resume-emacs-args-buffer))
113
(resume-write-buffer-to-file (current-buffer) resume-emacs-args-file)))
115
(defun resume-write-buffer-to-file (buffer file)
116
"Writes the contents of BUFFER into FILE, if permissions allow."
117
(if (not (file-writable-p file))
118
(error "No permission to write file %s" file))
121
(clear-visited-file-modtime)
124
(write-region (point-min) (point-max) file nil 'quiet))
125
(set-buffer-modified-p nil)))
129
;; arch-tag: c90b2761-4803-4e58-a0ae-c4721368b628
130
;;; resume.el ends here