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[emacs.git] / lisp / s-region.el
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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>
6 ;; Keywords: terminals
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)
14 ;; any later version.
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.
26 ;;; Commentary:
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")
36 ;; functions.
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
43 ;;; Code:
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."
51 (if (vectorp key)
52 (let ((last (aref key (1- (length key)))))
53 (if (symbolp last)
54 (let* ((keyname (symbol-name last))
55 (pos (string-match "S-" keyname)))
56 (if pos
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\""
67 (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\""
72 (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))
82 (sit-for 1)
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
90 to global keymap."
91 (let ((p2 (list 'scroll-up 'scroll-down
92 'beginning-of-buffer 'end-of-buffer)))
93 (or map (setq map global-map))
94 (while keylist
95 (let* ((key (car keylist))
96 (binding (key-binding key)))
97 (if (commandp binding)
98 (define-key
99 map
100 (vector (intern (concat "S-" (symbol-name (aref key 0)))))
101 (cond ((memq binding p2)
102 's-region-move-p2)
103 (t 's-region-move-p1)))))
104 (setq keylist (cdr keylist)))))
106 ;; Single keys (plus modifiers) only!
107 (s-region-bind
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))
122 (provide 's-region)
124 ;;; s-region.el ends here