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1 | ;;; master.el --- make a buffer the master over another buffer |
2 | ||
3 | ;; Copyright (C) 1999, 2000, 2001 Alexander Schroeder | |
4 | ||
5 | ;; Author: Alex Schroeder <alex@gnu.org> | |
6 | ;; Maintainer: Alex Schroeder <alex@gnu.org> | |
7 | ;; Version: 1.0.2 | |
8 | ;; Keywords: comm | |
9 | ||
10 | ;; This file is part of GNU Emacs. | |
11 | ||
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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 2, or (at your option) | |
15 | ;; any later version. | |
1ae6b8f1 | 16 | |
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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. | |
1ae6b8f1 GM |
21 | |
22 | ;; You should have received a copy of the GNU General Public License | |
23 | ;; along with GNU Emacs; see the file COPYING. If not, write to the | |
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24 | ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
25 | ;; Boston, MA 02111-1307, USA. | |
1ae6b8f1 GM |
26 | |
27 | ;;; Commentary: | |
28 | ||
29 | ;; master-mode is a minor mode which enables you to scroll another | |
30 | ;; buffer (the slave) without leaving your current buffer (the master). | |
31 | ||
32 | ;; It can be used by sql.el, for example: The SQL buffer is the master | |
33 | ;; and its SQLi buffer is the slave. This allows you to scroll the SQLi | |
34 | ;; buffer containing the output from the SQL buffer containing the | |
35 | ;; commands. | |
36 | ;; | |
37 | ;; This is how to use sql.el and master.el together: The variable | |
38 | ;; sql-buffer contains the slave buffer. It is a local variable in the | |
39 | ;; SQL buffer. | |
40 | ;; | |
1ae6b8f1 GM |
41 | ;; (add-hook 'sql-mode-hook |
42 | ;; (function (lambda () | |
43 | ;; (master-mode t) | |
44 | ;; (master-set-slave sql-buffer)))) | |
45 | ;; (add-hook 'sql-set-sqli-hook | |
46 | ;; (function (lambda () | |
47 | ;; (master-set-slave sql-buffer)))) | |
48 | ||
49 | ;;; Thanks to all the people who helped me out: | |
50 | ;; | |
51 | ;; Rob Riepel <networking.stanford.edu> | |
52 | ||
1ae6b8f1 | 53 | ;;; History: |
f1180544 | 54 | ;; |
1ae6b8f1 GM |
55 | |
56 | ;;; Code: | |
57 | ||
58 | (require 'easy-mmode) | |
59 | ||
60 | ;; Variables that don't need initialization. | |
f1180544 | 61 | |
1ae6b8f1 GM |
62 | (defvar master-of nil |
63 | "Slave buffer of the current buffer. See `master-mode'. | |
64 | You can set this variable using `master-set-slave'.") | |
65 | ||
66 | (defvar master-set-slave-hook nil | |
67 | "Hook run after the slave is changed using \\[master-set-slave].") | |
68 | ||
69 | ;;; Define master mode. | |
70 | ||
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71 | ;;;###autoload |
72 | (define-minor-mode master-mode | |
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73 | "Toggle Master mode. |
74 | With no argument, this command toggles the mode. | |
75 | Non-null prefix argument turns on the mode. | |
76 | Null prefix argument turns off the mode. | |
77 | ||
78 | When Master mode is enabled, you can scroll the slave buffer using the | |
79 | following commands: | |
80 | ||
81 | \\{master-mode-map} | |
82 | ||
83 | The slave buffer is stored in the buffer-local variable `master-of'. | |
84 | You can set this variable using `master-set-slave'. You can show | |
85 | yourself the value of `master-of' by calling `master-show-slave'." | |
86 | ;; The initial value. | |
87 | nil | |
88 | ;; The indicator for the mode line. | |
89 | nil | |
90 | ;; The minor mode bindings. | |
91 | '(("\C-c\C-n" . master-says-scroll-up) | |
92 | ("\C-c\C-p" . master-says-scroll-down) | |
93 | ("\C-c<" . master-says-beginning-of-buffer) | |
94 | ("\C-c>" . master-says-end-of-buffer) | |
95 | ("\C-c\C-l" . master-says-recenter))) | |
96 | ||
97 | ;; Initialize Master mode by setting a slave buffer. | |
98 | ||
99 | (defun master-set-slave (buffer) | |
100 | "Makes BUFFER the slave of the current buffer. | |
101 | Use \\[master-mode] to toggle control of the slave buffer." | |
102 | (interactive "bSlave: ") | |
103 | (make-local-variable 'master-of) | |
104 | (setq master-of buffer) | |
105 | (run-hooks 'master-set-slave-hook)) | |
106 | ||
107 | (defun master-show-slave () | |
108 | "Displays a message with the name of the slave buffer." | |
109 | (interactive) | |
110 | (message "This buffer is the master of %s. Master-mode is %S." | |
111 | (or master-of "none") | |
112 | master-mode)) | |
113 | ||
114 | \f | |
115 | ||
116 | ;;; Functions that the master buffer can call for the slave buffer. | |
117 | ||
118 | (defun master-says-scroll-up (&optional arg) | |
119 | "Display and scroll the slave buffer up. | |
120 | See `scroll-up'." | |
121 | (interactive) | |
122 | (master-says 'scroll-up arg)) | |
123 | ||
124 | (defun master-says-scroll-down (&optional arg) | |
125 | "Display and scroll the slave buffer down. | |
126 | See `scroll-down'." | |
127 | (interactive) | |
128 | (master-says 'scroll-down arg)) | |
129 | ||
130 | (defun master-says-beginning-of-buffer (&optional arg) | |
131 | "Display and move to the beginning of the slave buffer. | |
132 | See `beginning-of-buffer'." | |
133 | (interactive) | |
134 | (master-says 'beginning-of-buffer arg)) | |
135 | ||
136 | (defun master-says-end-of-buffer (&optional arg) | |
137 | "Display and move to the end of the slave buffer. | |
138 | See `end-of-buffer'." | |
139 | (interactive) | |
140 | (master-says 'end-of-buffer arg)) | |
141 | ||
142 | (defun master-says-recenter (&optional arg) | |
143 | "Recenter the slave buffer. | |
144 | See `recenter'." | |
145 | (interactive) | |
146 | (master-says 'recenter arg)) | |
147 | ||
148 | ;; The master function doing the stuff. | |
149 | ||
150 | (defun master-says (&optional command arg) | |
151 | "Display slave buffer and execute COMMAND with ARG in its window." | |
152 | (interactive) | |
153 | (if (null (buffer-live-p (get-buffer master-of))) | |
154 | (error "Slave buffer has disappeared") | |
155 | (let ((window (selected-window))) | |
156 | (if (not (eq (window-buffer window) (get-buffer master-of))) | |
157 | (switch-to-buffer-other-window master-of)) | |
158 | (if command (condition-case nil (apply command arg) (error nil))) | |
159 | (select-window window)))) | |
160 | ||
161 | (provide 'master) | |
162 | ||
6b61353c | 163 | ;;; arch-tag: dca08daa-8127-45ae-b77e-b135160dce98 |
1ae6b8f1 | 164 | ;;; master.el ends here |