Initial revision

lisp/s-region.el

+;;; s-region.el --- set region using shift key.
+;;; Copyright (C) 1994 Free Software Foundation, Inc.
+
+;; Author: Morten Welinder (terra@diku.dk)
+;; Version: 1.00
+;; 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, 675 Mass Ave, Cambridge, MA 02139, 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
+;; functionallity 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.
+
+;; 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 (&rest arg)
+  "This is an overlay function to point-moving keys."
+  (interactive "p")
+  (if (if mark-active (not (equal last-command 's-region-move)) t)
+      (set-mark-command nil)
+    (message "")) ; delete the "Mark set" message
+  (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 keys in KEYLIST to `s-region-move'.
+Each key in KEYLIST is bound to `s-region-move'
+provided it is already bound to some command or other.
+Optional second argument MAP specifies keymap to
+add binding to, defaulting to global keymap."
+  (or map (setq map global-map))
+  (while keylist
+    (if (commandp (key-binding (car keylist)))
+	(define-key
+	  map
+	  (vector (intern (concat "S-" (symbol-name (aref (car keylist) 0)))))
+	  's-region-move))
+    (setq keylist (cdr keylist))))
+
+(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]))
+
+(global-set-key [C-insert] 'copy-region-as-kill)
+(global-set-key [S-delete] 'kill-region)
+(global-set-key [S-insert] 'yank)
+
+(provide 's-region)
+
+;; s-region.el ends here.