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;;; s-region.el --- set region using shift key
;; Copyright (C) 1994, 1995, 2001, 2002, 2003, 2004,
;; 2005, 2006, 2007, 2008, 2009 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 3 of the License, 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. If not, see <http://www.gnu.org/licenses/>.
;;; 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 second 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)
;; arch-tag: a471e912-18d7-4247-a29b-2100bca180ff
;;; s-region.el ends here