;; crisp.el -- Emulator for CRiSP/Brief key bindings

;; Author: Gary D. Foster <Gary.Foster@corp.sun.com>
;; Keywords: emulations brief crisp

;; 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, Inc., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.

;;; Commentary:

;; This file provides keybindings and minor functions to duplicate the
;; functionality and finger-feel of the CRiSP/Brief editor.  This
;; package is designed to facilitate transitioning from Brief to Emacs
;; with a minimum amount of hassles.

;; Enable this package by putting the following in your .emacs
;; (require 'crisp)

;; This package will automatically default to loading the scroll-lock.el
;; package unless you put (setq crisp-load-scroll-lock nil) in your
;; .emacs.  If this feature is enabled, it will bind meta-f1 to the
;; scroll-lock mode toggle.

;; Also, the default keybindings for brief override the Meta-x key to
;; exit the editor.  If you don't like this functionality, you can
;; prevent this key from being rebound with
;; (setq crisp-override-meta-x nil) in your .emacs.

;; All these overrides should go *before* the (require 'crisp) statement.

;; local variables

(defvar crisp-mode-map (copy-keymap (current-global-map))
  "Keymap for CRiSP emulation.
All the emulation bindings are done here instead of globally.")

(defvar crisp-override-meta-x t
  "Controls overriding the normal Emacs M-x key binding in the CRiSP emulator.
Normally the CRiSP emulator rebinds M-x to save-buffers-exit-emacs
and provides the usual M-x functionality on the F10 key.

If this variable is nil when you start the CRiSP emulator, it
does not alter the binding of M-x.")

(defvar crisp-load-scroll-lock t
  "Controls loading of Scroll Lock in the CRiSP emulator.
Its default behavior is to load and enable the Scroll Lock minor mode
package when enabling the CRiSP emulator.

If this variable is nil when you start the CRiSP emulator, it
does not load Scroll Lock.")

(defvar crisp-load-hook nil
  "Hooks to run after loading the CRiSP emulator package.")

;; and now the keymap defines

(define-key crisp-mode-map [(f1)]           'other-window)

(define-key crisp-mode-map [(f2) (down)]    'enlarge-window)
(define-key crisp-mode-map [(f2) (left)]    'shrink-window-horizontally)
(define-key crisp-mode-map [(f2) (right)]   'enlarge-window-horizontally)
(define-key crisp-mode-map [(f2) (up)]      'shrink-window)
(define-key crisp-mode-map [(f3) (down)]    'split-window-vertically)
(define-key crisp-mode-map [(f3) (right)]   'split-window-horizontally)

(define-key crisp-mode-map [(f4)]           'delete-window)
(define-key crisp-mode-map [(control f4)]   'delete-other-windows)

(define-key crisp-mode-map [(f5)]           'search-forward-regexp)
(define-key crisp-mode-map [(f19)]          'search-forward-regexp)
(define-key crisp-mode-map [(meta f5)]       'search-backward-regexp)

(define-key crisp-mode-map [(f6)]           'query-replace)

(define-key crisp-mode-map [(f7)]           'start-kbd-macro)
(define-key crisp-mode-map [(meta f7)]       'end-kbd-macro)

(define-key crisp-mode-map [(f8)]           'call-last-kbd-macro)
(define-key crisp-mode-map [(meta f8)]      'save-kbd-macro)

(define-key crisp-mode-map [(f9)]           'find-file)
(define-key crisp-mode-map [(meta f9)]       'load-library)

(define-key crisp-mode-map [(f10)]          'execute-extended-command)
(define-key crisp-mode-map [(meta f10)]      'compile)

(define-key crisp-mode-map [(SunF37)]          'kill-buffer)
(define-key crisp-mode-map [(kp_add)]       'x-copy-primary-selection)
(define-key crisp-mode-map [(kp_subtract)]  'x-kill-primary-selection)
(define-key crisp-mode-map [(insert)]       'x-yank-clipboard-selection)
(define-key crisp-mode-map [(f16)]          'x-copy-primary-selection) ; copy on Sun5 kbd
(define-key crisp-mode-map [(f20)]          'x-kill-primary-selection) ; cut on Sun5 kbd 
(define-key crisp-mode-map [(f18)]          'x-yank-clipboard-selection) ; paste on Sun5 kbd

(define-key crisp-mode-map [(meta d)]       (lambda () (interactive) (beginning-of-line) (kill-line)))
(define-key crisp-mode-map [(meta e)]       'find-file)
(define-key crisp-mode-map [(meta g)]       'goto-line)
(define-key crisp-mode-map [(meta h)]       'help)
(define-key crisp-mode-map [(meta i)]       'overwrite-mode)
(define-key crisp-mode-map [(meta u)]       'advertised-undo)
(define-key crisp-mode-map [(f14)]          'advertised-undo)
(define-key crisp-mode-map [(meta w)]       'save-buffer)
(if
 (eq crisp-override-meta-x 't)
  (define-key crisp-mode-map [(meta x)]       'save-buffers-kill-emacs))

(define-key crisp-mode-map [(shift right)]  'fkey-forward-word)
(define-key crisp-mode-map [(shift left)]   'fkey-backward-word)
(define-key crisp-mode-map [(shift delete)] 'kill-word)
(define-key crisp-mode-map [(shift backspace)] 'backward-kill-word)
(define-key crisp-mode-map [(control left)] 'backward-word)
(define-key crisp-mode-map [(control right)] 'forward-word)

(define-key crisp-mode-map [(home)] 'crisp-home)
(define-key crisp-mode-map [(end)] 'crisp-end)


(defun crisp-home ()
  "\"Home\" the point, the way CRiSP would do it.
The first use moves point to beginning of the line.  Second
consecutive use moves point to beginning of the screen.  Third
consecutive use moves point to the beginning of the buffer."
  (interactive nil)
  (cond
    ((and (eq last-command 'crisp-home) (eq last-last-command 'crisp-home))
     (goto-char (point-min))
    )
    ((eq last-command 'crisp-home)
     (move-to-window-line 0)
    )
    (t
     (beginning-of-line)
    )
  )
  (setq last-last-command last-command)
)

(defun crisp-end ()
  "\"End\" the point, the way CRiSP would do it.
The first use moves point to end of the line.  Second
consecutive use moves point to the end of the screen.  Third
consecutive use moves point to the end of the buffer."
  (interactive nil)
  (cond
    ((and (eq last-command 'crisp-end) (eq last-last-command 'crisp-end))
     (goto-char (point-max))
    )
    ((eq last-command 'crisp-end)
     (move-to-window-line -1)
     (end-of-line)
    )
    (t
     (end-of-line)
    )
  )
  (setq last-last-command last-command)
)

;; Now enable the mode

(kill-all-local-variables)
(use-global-map crisp-mode-map)

(if (eq crisp-load-scroll-lock t)
    (require 'scroll-lock))

(if (featurep 'scroll-lock)
    (define-key crisp-mode-map [(meta f1)] 'scroll-lock-mode))

(run-hooks 'crisp-load-hook) ;; allow for hooks

(provide 'crisp)

;;; crisp.el ends here