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| | ;;; master.el --- make a buffer the master over another buffer -*- lexical-binding: t -*-
;; Copyright (C) 1999-2024 Free Software Foundation, Inc.
;; Author: Alex Schroeder <alex@gnu.org>
;; Old-Version: 1.0.2
;; Keywords: comm
;; 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 of the License, 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. If not, see <https://www.gnu.org/licenses/>.
;;; 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.
;;
;; (add-hook 'sql-mode-hook
;; (lambda ()
;; (master-mode t)
;; (master-set-slave sql-buffer)))
;; (add-hook 'sql-set-sqli-hook
;; (lambda ()
;; (master-set-slave sql-buffer)))
;;; Thanks to all the people who helped me out:
;;
;; Rob Riepel <networking.stanford.edu>
;;; Code:
;; 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.
;;;###autoload
(define-minor-mode master-mode
"Toggle Master 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'."
;; Not global, so no effect.
;;; :group 'master
:keymap
'(("\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)
"Make BUFFER the slave of the current buffer.
Use \\[master-mode] to toggle control of the slave buffer."
(interactive "bSlave: ")
(setq-local 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 (not (and master-of
(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
|