1 ;;; s-region.el --- set region using shift key
3 ;; Copyright (C) 1994, 1995 Free Software Foundation, Inc.
5 ;; Author: Morten Welinder <terra@diku.dk>
7 ;; Favourite-brand-of-beer: None, I hate beer.
9 ;; This file is part of GNU Emacs.
11 ;; GNU Emacs is free software; you can redistribute it and/or modify
12 ;; it under the terms of the GNU General Public License as published by
13 ;; the Free Software Foundation; either version 2, or (at your option)
16 ;; GNU Emacs is distributed in the hope that it will be useful,
17 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 ;; GNU General Public License for more details.
21 ;; You should have received a copy of the GNU General Public License
22 ;; along with GNU Emacs; see the file COPYING. If not, write to the
23 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
24 ;; Boston, MA 02111-1307, USA.
28 ;; Having loaded this code you can set the region by holding down the
29 ;; shift key and move the cursor to the other end of the region. The
30 ;; functionality provided by this code is similar to that provided by
31 ;; the editors of Borland International's compilers for ms-dos.
33 ;; Currently, s-region-move may be bound only to events that are vectors
34 ;; of length one and whose last element is a symbol. Also, the functions
35 ;; that are given this kind of overlay should be (interactive "p")
38 ;; If the following keys are not already bound then...
39 ;; C-insert is bound to copy-region-as-kill
40 ;; S-delete is bound to kill-region
41 ;; S-insert is bound to yank
45 (defvar s-region-overlay (make-overlay 1 1))
46 (overlay-put s-region-overlay 'face 'region)
47 (overlay-put s-region-overlay 'priority 1000000) ; for hilit19
49 (defun s-region-unshift (key)
50 "Remove shift modifier from last keypress KEY and return that as a key."
52 (let ((last (aref key (1- (length key)))))
54 (let* ((keyname (symbol-name last))
55 (pos (string-match "S-" keyname)))
57 ;; We skip all initial parts of the event assuming that
58 ;; those are setting up the prefix argument to the command.
59 (vector (intern (concat (substring keyname 0 pos)
60 (substring keyname (+ 2 pos)))))
61 (error "Non-shifted key: %S" key)))
62 (error "Key does not end in a symbol: %S" key)))
63 (error "Non-vector key: %S" key)))
65 (defun s-region-move-p1 (&rest arg)
66 "This is an overlay function to point-moving keys that are interactive \"p\""
68 (apply (function s-region-move) arg))
70 (defun s-region-move-p2 (&rest arg)
71 "This is an overlay function to point-moving keys that are interactive \"P\""
73 (apply (function s-region-move) arg))
75 (defun s-region-move (&rest arg)
76 (if (if mark-active (not (equal last-command 's-region-move)) t)
77 (set-mark-command nil)
78 (message "")) ; delete the "Mark set" message
79 (setq this-command 's-region-move)
80 (apply (key-binding (s-region-unshift (this-command-keys))) arg)
81 (move-overlay s-region-overlay (mark) (point) (current-buffer))
83 (delete-overlay s-region-overlay))
85 (defun s-region-bind (keylist &optional map)
86 "Bind shifted keys in KEYLIST to s-region-move-p1 or s-region-move-p2.
87 Each key in KEYLIST is shifted and bound to one of the s-region-move
88 functions provided it is already bound to some command or other.
89 Optional third argument MAP specifies keymap to add binding to, defaulting
91 (let ((p2 (list 'scroll-up 'scroll-down
92 'beginning-of-buffer 'end-of-buffer)))
93 (or map (setq map global-map))
95 (let* ((key (car keylist))
96 (binding (key-binding key)))
97 (if (commandp binding)
100 (vector (intern (concat "S-" (symbol-name (aref key 0)))))
101 (cond ((memq binding p2)
103 (t 's-region-move-p1)))))
104 (setq keylist (cdr keylist)))))
106 ;; Single keys (plus modifiers) only!
108 (list [right] [left] [up] [down]
109 [C-left] [C-right] [C-up] [C-down]
110 [M-left] [M-right] [M-up] [M-down]
111 [next] [previous] [home] [end]
112 [C-next] [C-previous] [C-home] [C-end]
113 [M-next] [M-previous] [M-home] [M-end]))
115 (or (global-key-binding [C-insert])
116 (global-set-key [C-insert] 'copy-region-as-kill))
117 (or (global-key-binding [S-delete])
118 (global-set-key [S-delete] 'kill-region))
119 (or (global-key-binding [S-insert])
120 (global-set-key [S-insert] 'yank))
124 ;;; s-region.el ends here