1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
|
;;; resume.el --- process command line args from within a suspended Emacs job
;; Copyright (C) 1992, 2001, 2002, 2003, 2004, 2005,
;; 2006, 2007 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, 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
|
