lisp/s-region.el

   1 ;;; s-region.el --- set region using shift key
   2
   3 ;; Copyright (C) 1994, 1995 Free Software Foundation, Inc.
   4
   5 ;; Author: Morten Welinder <terra@diku.dk>
   6 ;; Keywords: terminals
   7 ;; Favourite-brand-of-beer: None, I hate beer.
   8
   9 ;; This file is part of GNU Emacs.
  10
  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.
  15
  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.
  20
  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.
  25
  26 ;;; Commentary:
  27
  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.
  32
  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.
  37
  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
  42
  43 ;;; Code:
  44
  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
  48
  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)))
  64
  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))
  69
  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))
  74
  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))
  84
  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)))))
 105
 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]))
 114
 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))
 121
 122 (provide 's-region)
 123
 124 ;;; s-region.el ends here