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diff --git a/lisp/ChangeLog b/lisp/ChangeLog
index 882028aab43d8148e7c505b4f4835e78aedbff4c..ab33861128dfa6049436f2f05a7f63cb09c3b0ca 100644 (file)
--- a/lisp/ChangeLog
+++ b/lisp/ChangeLog
@@ -1,3 +1,7 @@
+2001-10-11  Gerd Moellmann  <gerd@gnu.org>
+
+       * master.el: New file.
+
 2001-10-11  Dave Love  <fx@gnu.org>
 
        * emacs-lisp/byte-opt.el (byte-optimize-lapcode)

diff --git a/lisp/master.el b/lisp/master.el
new file mode 100644 (file)
index 0000000..157cfee
--- /dev/null
+++ b/lisp/master.el
@@ -0,0 +1,167 @@
+;;; master.el --- make a buffer the master over another buffer
+
+;; Copyright (C) 1999, 2000, 2001  Alexander Schroeder
+
+;; Author: Alex Schroeder <alex@gnu.org>
+;; Maintainer: Alex Schroeder <alex@gnu.org>
+;; Version: 1.0.2
+;; Keywords: comm
+
+;; This file is part of GNU Emacs.
+
+;; master.el 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 2, or (at your option) any
+;; later version.
+
+;; master.el 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., 59 Temple Place - Suite 330, Boston,
+;; MA 02111-1307, USA.
+
+;;; Commentary:
+
+;; master-mode is a minor mode which enables you to scroll another
+;; buffer (the slave) without leaving your current buffer (the master).
+
+;; It can be used by sql.el, for example: The SQL buffer is the master
+;; and its SQLi buffer is the slave.  This allows you to scroll the SQLi
+;; buffer containing the output from the SQL buffer containing the
+;; commands.
+;;
+;; This is how to use sql.el and master.el together: The variable
+;; sql-buffer contains the slave buffer.  It is a local variable in the
+;; SQL buffer.
+;;
+;; (autoload 'master-mode "master" "Master mode minor mode." t)
+;; (add-hook 'sql-mode-hook
+;;        (function (lambda ()
+;;                    (master-mode t)
+;;                    (master-set-slave sql-buffer))))
+;; (add-hook 'sql-set-sqli-hook
+;;        (function (lambda ()
+;;                    (master-set-slave sql-buffer))))
+
+;;; Thanks to all the people who helped me out:
+;;
+;; Rob Riepel <networking.stanford.edu>
+
+\f
+
+
+;;; History:
+;; 
+
+;;; Code:
+
+(require 'easy-mmode)
+
+;; Variables that don't need initialization.
+  
+(defvar master-of nil
+  "Slave buffer of the current buffer.  See `master-mode'.
+You can set this variable using `master-set-slave'.")
+
+(defvar master-set-slave-hook nil
+  "Hook run after the slave is changed using \\[master-set-slave].")
+
+;;; Define master mode.
+
+(easy-mmode-define-minor-mode master-mode
+  "Toggle Master mode.
+With no argument, this command toggles the mode.
+Non-null prefix argument turns on the mode.
+Null prefix argument turns off the mode.
+
+When Master mode is enabled, you can scroll the slave buffer using the
+following commands:
+
+\\{master-mode-map}
+
+The slave buffer is stored in the buffer-local variable `master-of'.
+You can set this variable using `master-set-slave'.  You can show
+yourself the value of `master-of' by calling `master-show-slave'."
+ ;; The initial value.
+ nil
+ ;; The indicator for the mode line.
+ nil
+ ;; The minor mode bindings.
+ '(("\C-c\C-n" . master-says-scroll-up)
+   ("\C-c\C-p" . master-says-scroll-down)
+   ("\C-c<" . master-says-beginning-of-buffer)
+   ("\C-c>" . master-says-end-of-buffer)
+   ("\C-c\C-l" . master-says-recenter)))
+
+;; Initialize Master mode by setting a slave buffer.
+
+(defun master-set-slave (buffer)
+  "Makes BUFFER the slave of the current buffer.
+Use \\[master-mode] to toggle control of the slave buffer."
+  (interactive "bSlave: ")
+  (make-local-variable 'master-of)
+  (setq master-of buffer)
+  (run-hooks 'master-set-slave-hook))
+
+(defun master-show-slave ()
+  "Displays a message with the name of the slave buffer."
+  (interactive)
+  (message "This buffer is the master of %s.  Master-mode is %S."
+          (or master-of "none")
+          master-mode))
+
+\f
+
+;;; Functions that the master buffer can call for the slave buffer.
+
+(defun master-says-scroll-up (&optional arg)
+  "Display and scroll the slave buffer up.
+See `scroll-up'."
+  (interactive)
+  (master-says 'scroll-up arg))
+
+(defun master-says-scroll-down (&optional arg)
+  "Display and scroll the slave buffer down.
+See `scroll-down'."
+  (interactive)
+  (master-says 'scroll-down arg))
+
+(defun master-says-beginning-of-buffer (&optional arg)
+  "Display and move to the beginning of the slave buffer.
+See `beginning-of-buffer'."
+  (interactive)
+  (master-says 'beginning-of-buffer arg))
+
+(defun master-says-end-of-buffer (&optional arg)
+  "Display and move to the end of the slave buffer.
+See `end-of-buffer'."
+  (interactive)
+  (master-says 'end-of-buffer arg))
+
+(defun master-says-recenter (&optional arg)
+  "Recenter the slave buffer.
+See `recenter'."
+  (interactive)
+  (master-says 'recenter arg))
+
+;; The master function doing the stuff.
+
+(defun master-says (&optional command arg)
+  "Display slave buffer and execute COMMAND with ARG in its window."
+  (interactive)
+  (if (null (buffer-live-p (get-buffer master-of)))
+      (error "Slave buffer has disappeared")
+    (let ((window  (selected-window)))
+      (if (not (eq (window-buffer window) (get-buffer master-of)))
+         (switch-to-buffer-other-window master-of))
+      (if command (condition-case nil (apply command arg) (error nil)))
+      (select-window window))))
+
+(provide 'master)
+
+;;; master.el ends here
+