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c88ab9ce ER |
1 | ;;; resume.el --- process command line args from within a suspended Emacs job |
2 | ||
9750e079 ER |
3 | ;; Copyright (C) 1992 Free Software Foundation, Inc. |
4 | ||
f961a17c | 5 | ;; Author: Joe Wells <jbw@bucsf.bu.edu> |
f961a17c | 6 | ;; Adapted-By: ESR |
d7b4d18f | 7 | ;; Keywords: processes |
f961a17c | 8 | |
f961a17c ER |
9 | ;; This file is part of GNU Emacs. |
10 | ||
11 | ;; GNU Emacs is free software; you can redistribute it and/or modify | |
12 | ;; it under the terms of the GNU General Public License as published by | |
7c938215 | 13 | ;; the Free Software Foundation; either version 2, or (at your option) |
f961a17c | 14 | ;; any later version. |
dc556c64 | 15 | |
dc556c64 | 16 | ;; GNU Emacs is distributed in the hope that it will be useful, |
f961a17c ER |
17 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of |
18 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19 | ;; GNU General Public License for more details. | |
20 | ||
21 | ;; You should have received a copy of the GNU General Public License | |
b578f267 EN |
22 | ;; along with GNU Emacs; see the file COPYING. If not, write to the |
23 | ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
24 | ;; Boston, MA 02111-1307, USA. | |
f961a17c ER |
25 | |
26 | ;;; Commentary: | |
27 | ||
8f3d8a86 RS |
28 | ;; The purpose of this library is to handle command line arguments |
29 | ;; when you resume an existing Emacs job. | |
30 | ||
31 | ;; In order to use it, you must put this code in your .emacs file. | |
32 | ||
33 | ;; (add-hook 'suspend-hook 'resume-suspend-hook) | |
34 | ;; (add-hook 'suspend-resume-hook 'resume-process-args) | |
35 | ||
36 | ;; You can't get the benefit of this library by using the `emacs' command, | |
37 | ;; since that always starts a new Emacs job. Instead you must use a | |
38 | ;; command called `edit' which knows how to resume an existing Emacs job | |
39 | ;; if you have one, or start a new Emacs job if you don't have one. | |
40 | ||
41 | ;; To define the `edit' command, run the script etc/emacs.csh (if you use CSH), | |
42 | ;; or etc/emacs.bash if you use BASH. You would normally do this in your | |
43 | ;; login script. | |
f961a17c ER |
44 | |
45 | ;; Stephan Gildea suggested bug fix (gildea@bbn.com). | |
dc556c64 RS |
46 | ;; Ideas from Michael DeCorte and other people. |
47 | ||
f961a17c ER |
48 | ;;; Code: |
49 | ||
078380ac | 50 | (defvar resume-emacs-args-file (expand-file-name "~/.emacs_args") |
dc556c64 RS |
51 | "*This file is where arguments are placed for a suspended emacs job.") |
52 | ||
078380ac | 53 | (defvar resume-emacs-args-buffer " *Command Line Args*" |
d543cc8e | 54 | "Buffer that is used by resume-process-args.") |
dc556c64 RS |
55 | |
56 | (defun resume-process-args () | |
078380ac | 57 | "Handler for command line args given when Emacs is resumed." |
d543cc8e | 58 | (let ((start-buffer (current-buffer)) |
078380ac | 59 | (args-buffer (get-buffer-create resume-emacs-args-buffer)) |
5d2e242c KH |
60 | length args |
61 | (command-line-default-directory default-directory)) | |
dc556c64 RS |
62 | (unwind-protect |
63 | (progn | |
d543cc8e | 64 | (set-buffer args-buffer) |
dc556c64 | 65 | (erase-buffer) |
078380ac | 66 | ;; get the contents of resume-emacs-args-file |
dc556c64 | 67 | (condition-case () |
078380ac | 68 | (let ((result (insert-file-contents resume-emacs-args-file))) |
d543cc8e RS |
69 | (setq length (car (cdr result)))) |
70 | ;; the file doesn't exist, ergo no arguments | |
71 | (file-error | |
72 | (erase-buffer) | |
73 | (setq length 0))) | |
74 | (if (<= length 0) | |
75 | (setq args nil) | |
76 | ;; get the arguments from the buffer | |
77 | (goto-char (point-min)) | |
78 | (while (not (eobp)) | |
79 | (skip-chars-forward " \t\n") | |
80 | (let ((begin (point))) | |
81 | (skip-chars-forward "^ \t\n") | |
82 | (setq args (cons (buffer-substring begin (point)) args))) | |
83 | (skip-chars-forward " \t\n")) | |
84 | ;; arguments are now in reverse order | |
85 | (setq args (nreverse args)) | |
86 | ;; make sure they're not read again | |
87 | (erase-buffer)) | |
078380ac | 88 | (resume-write-buffer-to-file (current-buffer) resume-emacs-args-file) |
d543cc8e RS |
89 | ;; if nothing was in buffer, args will be null |
90 | (or (null args) | |
5d2e242c KH |
91 | (setq command-line-default-directory |
92 | (file-name-as-directory (car args)) | |
d543cc8e RS |
93 | args (cdr args))) |
94 | ;; actually process the arguments | |
95 | (command-line-1 args)) | |
dc556c64 | 96 | ;; If the command line args don't result in a find-file, the |
d543cc8e | 97 | ;; buffer will be left in args-buffer. So we change back to the |
dc556c64 RS |
98 | ;; original buffer. The reason I don't just use |
99 | ;; (let ((default-directory foo)) | |
100 | ;; (command-line-1 args)) | |
101 | ;; in the context of the original buffer is because let does not | |
102 | ;; work properly with buffer-local variables. | |
d543cc8e RS |
103 | (if (eq (current-buffer) args-buffer) |
104 | (set-buffer start-buffer))))) | |
105 | ||
078380ac | 106 | ;;;###autoload |
30c9c6d7 | 107 | (defun resume-suspend-hook () |
078380ac | 108 | "Clear out the file used for transmitting args when Emacs resumes." |
d543cc8e | 109 | (save-excursion |
078380ac | 110 | (set-buffer (get-buffer-create resume-emacs-args-buffer)) |
d543cc8e | 111 | (erase-buffer) |
078380ac | 112 | (resume-write-buffer-to-file (current-buffer) resume-emacs-args-file))) |
d543cc8e | 113 | |
078380ac | 114 | (defun resume-write-buffer-to-file (buffer file) |
d543cc8e RS |
115 | "Writes the contents of BUFFER into FILE, if permissions allow." |
116 | (if (not (file-writable-p file)) | |
117 | (error "No permission to write file %s" file)) | |
118 | (save-excursion | |
119 | (set-buffer buffer) | |
120 | (clear-visited-file-modtime) | |
121 | (save-restriction | |
122 | (widen) | |
123 | (write-region (point-min) (point-max) file nil 'quiet)) | |
124 | (set-buffer-modified-p nil))) | |
c88ab9ce | 125 | |
5d2e242c KH |
126 | (provide 'resume) |
127 | ||
c88ab9ce | 128 | ;;; resume.el ends here |