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Most of this change is to boilerplate commentary such as license URLs. This change was prompted by ftp://ftp.gnu.org's going-away party, planned for November. Change these FTP URLs to https://ftp.gnu.org instead. Make similar changes for URLs to other organizations moving away from FTP. Also, change HTTP to HTTPS for URLs to gnu.org and fsf.org when this works, as this will further help defend against man-in-the-middle attacks (for this part I omitted the MS-DOS and MS-Windows sources and the test tarballs to keep the workload down). HTTPS is not fully working to lists.gnu.org so I left those URLs alone for now.
121 lines
4.1 KiB
EmacsLisp
121 lines
4.1 KiB
EmacsLisp
;;; scroll-all.el --- scroll all buffers together minor mode
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;; Copyright (C) 1997, 2001-2017 Free Software Foundation, Inc.
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;; Author: Gary D. Foster <Gary.Foster@corp.sun.com>
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;; Keywords: convenience scroll lock
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software: you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
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;;; Commentary:
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;; This mode allows multiple buffers to be 'locked' so that scrolling
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;; up or down lines in any buffer causes all the buffers to mirror
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;; the scrolling. It hooks into the post-command-hook to check for
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;; potential scrolling commands and if we're locked, mirrors them in all
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;; windows. This allows us to grab line-at-a-time scrolling as well as
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;; screen-at-a-time scrolling, and doesn't remap any of the keyboard
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;; commands to do it.
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;; You can enable and disable this mode with the 'scroll-all-mode' command.
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;; Suggestions/ideas from:
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;; Rick Macdonald <rickm@vsl.com>
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;; Anders Lindgren
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;;; Code:
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(defun scroll-all-function-all (func arg)
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"Apply function FUNC with argument ARG to all visible windows."
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(let ((num-windows (count-windows))
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(count 1))
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(when (> num-windows 1)
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(other-window 1)
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(while (< count num-windows)
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(condition-case nil
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(funcall func arg)
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;; Ignore beginning- or end-of-buffer error in other windows.
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(error nil)
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)
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(other-window 1)
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(setq count (1+ count))))))
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(defun scroll-all-scroll-down-all (arg)
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"Scroll down in all visible windows."
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(interactive "p")
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(scroll-all-function-all 'next-line arg))
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(defun scroll-all-scroll-up-all (arg)
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"Scroll up in all visible windows."
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(interactive "p")
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(scroll-all-function-all 'previous-line arg))
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(defun scroll-all-page-down-all (arg)
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"Page down in all visible windows."
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(interactive "P")
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(scroll-all-function-all 'scroll-up arg))
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(defun scroll-all-page-up-all (arg)
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"Page up in all visible windows."
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(interactive "P")
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(scroll-all-function-all 'scroll-down arg))
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(defun scroll-all-beginning-of-buffer-all (arg)
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"Go to the beginning of the buffer in all visible windows."
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(interactive "P")
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(scroll-all-function-all 'beginning-of-buffer arg))
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(defun scroll-all-end-of-buffer-all (arg)
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"Go to the end of the buffer in all visible windows."
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(interactive "P")
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(scroll-all-function-all 'end-of-buffer arg))
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(defun scroll-all-check-to-scroll ()
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"Check `this-command' to see if a scroll is to be done."
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(cond ((eq this-command 'next-line)
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(call-interactively 'scroll-all-scroll-down-all))
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((eq this-command 'previous-line)
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(call-interactively 'scroll-all-scroll-up-all))
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((memq this-command '(scroll-up scroll-up-command))
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(call-interactively 'scroll-all-page-down-all))
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((memq this-command '(scroll-down scroll-down-command))
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(call-interactively 'scroll-all-page-up-all))
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((eq this-command 'beginning-of-buffer)
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(call-interactively 'scroll-all-beginning-of-buffer-all))
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((eq this-command 'end-of-buffer)
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(call-interactively 'scroll-all-end-of-buffer-all))))
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;;;###autoload
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(define-minor-mode scroll-all-mode
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"Toggle shared scrolling in same-frame windows (Scroll-All mode).
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With a prefix argument ARG, enable Scroll-All mode if ARG is
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positive, and disable it otherwise. If called from Lisp, enable
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the mode if ARG is omitted or nil.
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When Scroll-All mode is enabled, scrolling commands invoked in
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one window apply to all visible windows in the same frame."
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nil " *SL*" nil
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:global t
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:group 'windows
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(if scroll-all-mode
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(add-hook 'post-command-hook 'scroll-all-check-to-scroll)
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(remove-hook 'post-command-hook 'scroll-all-check-to-scroll)))
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(provide 'scroll-all)
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;;; scroll-all.el ends here
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