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- ;;; s-region.el --- set region using shift key.
-
- ;; Copyright (C) 1994, 1995 Free Software Foundation, Inc.
-
- ;; Author: Morten Welinder (terra@diku.dk)
- ;; Keywords: terminals
- ;; Favourite-brand-of-beer: None, I hate beer.
-
- ;; 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 2, 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; see the file COPYING. If not, write to the
- ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- ;; Boston, MA 02111-1307, USA.
-
- ;;; Commentary:
-
- ;; Having loaded this code you can set the region by holding down the
- ;; shift key and move the cursor to the other end of the region. The
- ;; functionality provided by this code is similar to that provided by
- ;; the editors of Borland International's compilers for ms-dos.
-
- ;; Currently, s-region-move may be bound only to events that are vectors
- ;; of length one and whose last element is a symbol. Also, the functions
- ;; that are given this kind of overlay should be (interactive "p")
- ;; functions.
-
- ;; If the following keys are not already bound then...
- ;; C-insert is bound to copy-region-as-kill
- ;; S-delete is bound to kill-region
- ;; S-insert is bound to yank
-
- ;;; Code:
-
- (defvar s-region-overlay (make-overlay 1 1))
- (overlay-put s-region-overlay 'face 'region)
- (overlay-put s-region-overlay 'priority 1000000) ; for hilit19
-
- (defun s-region-unshift (key)
- "Remove shift modifier from last keypress KEY and return that as a key."
- (if (vectorp key)
- (let ((last (aref key (1- (length key)))))
- (if (symbolp last)
- (let* ((keyname (symbol-name last))
- (pos (string-match "S-" keyname)))
- (if pos
- ;; We skip all initial parts of the event assuming that
- ;; those are setting up the prefix argument to the command.
- (vector (intern (concat (substring keyname 0 pos)
- (substring keyname (+ 2 pos)))))
- (error "Non-shifted key: %S" key)))
- (error "Key does not end in a symbol: %S" key)))
- (error "Non-vector key: %S" key)))
-
- (defun s-region-move-p1 (&rest arg)
- "This is an overlay function to point-moving keys that are interactive \"p\""
- (interactive "p")
- (apply (function s-region-move) arg))
-
- (defun s-region-move-p2 (&rest arg)
- "This is an overlay function to point-moving keys that are interactive \"P\""
- (interactive "P")
- (apply (function s-region-move) arg))
-
- (defun s-region-move (&rest arg)
- (if (if mark-active (not (equal last-command 's-region-move)) t)
- (set-mark-command nil)
- (message "")) ; delete the "Mark set" message
- (setq this-command 's-region-move)
- (apply (key-binding (s-region-unshift (this-command-keys))) arg)
- (move-overlay s-region-overlay (mark) (point) (current-buffer))
- (sit-for 1)
- (delete-overlay s-region-overlay))
-
- (defun s-region-bind (keylist &optional map)
- "Bind shifted keys in KEYLIST to s-region-move-p1 or s-region-move-p2.
- Each key in KEYLIST is shifted and bound to one of the s-region-move
- functions provided it is already bound to some command or other.
- Optional third argument MAP specifies keymap to add binding to, defaulting
- to global keymap."
- (let ((p2 (list 'scroll-up 'scroll-down
- 'beginning-of-buffer 'end-of-buffer)))
- (or map (setq map global-map))
- (while keylist
- (let* ((key (car keylist))
- (binding (key-binding key)))
- (if (commandp binding)
- (define-key
- map
- (vector (intern (concat "S-" (symbol-name (aref key 0)))))
- (cond ((memq binding p2)
- 's-region-move-p2)
- (t 's-region-move-p1)))))
- (setq keylist (cdr keylist)))))
-
- ;; Single keys (plus modifiers) only!
- (s-region-bind
- (list [right] [left] [up] [down]
- [C-left] [C-right] [C-up] [C-down]
- [M-left] [M-right] [M-up] [M-down]
- [next] [previous] [home] [end]
- [C-next] [C-previous] [C-home] [C-end]
- [M-next] [M-previous] [M-home] [M-end]))
-
- (or (global-key-binding [C-insert])
- (global-set-key [C-insert] 'copy-region-as-kill))
- (or (global-key-binding [S-delete])
- (global-set-key [S-delete] 'kill-region))
- (or (global-key-binding [S-insert])
- (global-set-key [S-insert] 'yank))
-
- (provide 's-region)
-
- ;; s-region.el ends here.
-