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c88ab9ce ER |
1 | ;;; resume.el --- process command line args from within a suspended Emacs job |
2 | ||
aaef169d TTN |
3 | ;; Copyright (C) 1992, 2002, 2003, 2004, 2005, |
4 | ;; 2006 Free Software Foundation, Inc. | |
9750e079 | 5 | |
f961a17c | 6 | ;; Author: Joe Wells <jbw@bucsf.bu.edu> |
f961a17c | 7 | ;; Adapted-By: ESR |
d7b4d18f | 8 | ;; Keywords: processes |
f961a17c | 9 | |
f961a17c ER |
10 | ;; This file is part of GNU Emacs. |
11 | ||
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 | |
7c938215 | 14 | ;; the Free Software Foundation; either version 2, or (at your option) |
f961a17c | 15 | ;; any later version. |
dc556c64 | 16 | |
dc556c64 | 17 | ;; GNU Emacs is distributed in the hope that it will be useful, |
f961a17c ER |
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. | |
21 | ||
22 | ;; You should have received a copy of the GNU General Public License | |
b578f267 | 23 | ;; along with GNU Emacs; see the file COPYING. If not, write to the |
086add15 LK |
24 | ;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
25 | ;; Boston, MA 02110-1301, USA. | |
f961a17c ER |
26 | |
27 | ;;; Commentary: | |
28 | ||
8f3d8a86 RS |
29 | ;; The purpose of this library is to handle command line arguments |
30 | ;; when you resume an existing Emacs job. | |
31 | ||
32 | ;; In order to use it, you must put this code in your .emacs file. | |
33 | ||
34 | ;; (add-hook 'suspend-hook 'resume-suspend-hook) | |
35 | ;; (add-hook 'suspend-resume-hook 'resume-process-args) | |
36 | ||
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. | |
41 | ||
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 | |
44 | ;; login script. | |
f961a17c ER |
45 | |
46 | ;; Stephan Gildea suggested bug fix (gildea@bbn.com). | |
dc556c64 RS |
47 | ;; Ideas from Michael DeCorte and other people. |
48 | ||
f961a17c ER |
49 | ;;; Code: |
50 | ||
078380ac | 51 | (defvar resume-emacs-args-file (expand-file-name "~/.emacs_args") |
dc556c64 RS |
52 | "*This file is where arguments are placed for a suspended emacs job.") |
53 | ||
078380ac | 54 | (defvar resume-emacs-args-buffer " *Command Line Args*" |
d543cc8e | 55 | "Buffer that is used by resume-process-args.") |
dc556c64 RS |
56 | |
57 | (defun resume-process-args () | |
078380ac | 58 | "Handler for command line args given when Emacs is resumed." |
d543cc8e | 59 | (let ((start-buffer (current-buffer)) |
078380ac | 60 | (args-buffer (get-buffer-create resume-emacs-args-buffer)) |
5d2e242c KH |
61 | length args |
62 | (command-line-default-directory default-directory)) | |
dc556c64 RS |
63 | (unwind-protect |
64 | (progn | |
d543cc8e | 65 | (set-buffer args-buffer) |
dc556c64 | 66 | (erase-buffer) |
078380ac | 67 | ;; get the contents of resume-emacs-args-file |
dc556c64 | 68 | (condition-case () |
078380ac | 69 | (let ((result (insert-file-contents resume-emacs-args-file))) |
d543cc8e RS |
70 | (setq length (car (cdr result)))) |
71 | ;; the file doesn't exist, ergo no arguments | |
72 | (file-error | |
73 | (erase-buffer) | |
74 | (setq length 0))) | |
75 | (if (<= length 0) | |
76 | (setq args nil) | |
77 | ;; get the arguments from the buffer | |
78 | (goto-char (point-min)) | |
79 | (while (not (eobp)) | |
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 | |
f1180544 | 88 | (erase-buffer)) |
078380ac | 89 | (resume-write-buffer-to-file (current-buffer) resume-emacs-args-file) |
d543cc8e RS |
90 | ;; if nothing was in buffer, args will be null |
91 | (or (null args) | |
5d2e242c KH |
92 | (setq command-line-default-directory |
93 | (file-name-as-directory (car args)) | |
d543cc8e RS |
94 | args (cdr args))) |
95 | ;; actually process the arguments | |
96 | (command-line-1 args)) | |
dc556c64 | 97 | ;; If the command line args don't result in a find-file, the |
d543cc8e | 98 | ;; buffer will be left in args-buffer. So we change back to the |
dc556c64 RS |
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. | |
d543cc8e RS |
104 | (if (eq (current-buffer) args-buffer) |
105 | (set-buffer start-buffer))))) | |
106 | ||
078380ac | 107 | ;;;###autoload |
30c9c6d7 | 108 | (defun resume-suspend-hook () |
078380ac | 109 | "Clear out the file used for transmitting args when Emacs resumes." |
d543cc8e | 110 | (save-excursion |
078380ac | 111 | (set-buffer (get-buffer-create resume-emacs-args-buffer)) |
d543cc8e | 112 | (erase-buffer) |
078380ac | 113 | (resume-write-buffer-to-file (current-buffer) resume-emacs-args-file))) |
d543cc8e | 114 | |
078380ac | 115 | (defun resume-write-buffer-to-file (buffer file) |
d543cc8e RS |
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)) | |
119 | (save-excursion | |
120 | (set-buffer buffer) | |
121 | (clear-visited-file-modtime) | |
122 | (save-restriction | |
123 | (widen) | |
124 | (write-region (point-min) (point-max) file nil 'quiet)) | |
125 | (set-buffer-modified-p nil))) | |
c88ab9ce | 126 | |
5d2e242c KH |
127 | (provide 'resume) |
128 | ||
ab5796a9 | 129 | ;;; arch-tag: c90b2761-4803-4e58-a0ae-c4721368b628 |
c88ab9ce | 130 | ;;; resume.el ends here |