emacs/lisp/emulation/viper-keym.el

;;; viper-keym.el --- Viper keymaps

;; Copyright (C) 1994, 1995, 1996, 1997 Free Software Foundation, Inc.

;; 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.

;; Code

(provide 'viper-keym)

;; compiler pacifier
(defvar viper-always)
(defvar viper-current-state)
(defvar viper-mode-string)
(defvar viper-expert-level)
(defvar viper-ex-style-editing)
(defvar viper-ex-style-motion)

;; loading happens only in non-interactive compilation
;; in order to spare non-viperized emacs from being viperized
(if noninteractive
    (eval-when-compile
      (let ((load-path (cons (expand-file-name ".") load-path)))
	(or (featurep 'viper-util)
	    (load "viper-util.el" nil nil 'nosuffix))
	)))
;; end pacifier

(require 'viper-util)


;;; Variables

(defvar viper-toggle-key "\C-z"
  "The key used to change states from emacs to Vi and back.
In insert mode, this key also functions as Meta. 
Must be set in .viper file or prior to loading Viper.
This setting cannot be changed interactively.")

(defvar viper-ESC-key "\e" 
  "Key used to ESC. 
Must be set in .viper file or prior to loading Viper.
This setting cannot be changed interactively.")
  
;;; Emacs keys in other states.  

(defcustom viper-want-emacs-keys-in-insert t
  "*Set to nil if you want complete Vi compatibility in insert mode.
Complete compatibility with Vi is not recommended for power use of Viper."
  :type 'boolean
  :group 'viper)

(defcustom viper-want-emacs-keys-in-vi t
  "*Set to nil if you want complete Vi compatibility in Vi mode.
Full Vi compatibility is not recommended for power use of Viper."
  :type 'boolean
  :group 'viper)

(defcustom viper-no-multiple-ESC  t
  "*If true, multiple ESC in Vi mode will cause bell to ring.
This is set to t on a windowing terminal and to 'twice on a dumb
terminal (unless the user level is 1, 2, or 5). On a dumb terminal, this
enables cursor keys and is generally more convenient, as terminals usually
don't have a convenient Meta key.
Setting viper-no-multiple-ESC to nil will allow as many multiple ESC,
as is allowed by the major mode in effect."
  :type 'boolean
  :group 'viper) 

(defcustom viper-want-ctl-h-help nil
  "*If non-nil, C-h gets bound to help-command; otherwise, C-h gets the usual Vi bindings."
  :type 'boolean
  :group 'viper)


;;; Keymaps

;; Keymaps for vital things like \e and C-z.
;; Not for users
(defvar viper-vi-intercept-map (make-sparse-keymap))
(defvar viper-insert-intercept-map (make-sparse-keymap))
(defvar viper-emacs-intercept-map (make-sparse-keymap))

;; keymap used to zap all keymaps other than function-key-map,
;; device-function-key-map, etc.
(defvar viper-overriding-map (make-sparse-keymap))
  
(viper-deflocalvar viper-vi-local-user-map (make-sparse-keymap)
  "Keymap for user-defined local bindings.
Useful for changing bindings such as ZZ in certain major modes.
For instance, in letter-mode, one may want to bind ZZ to
mh-send-letter. In a newsreader such as gnus, tin, or rn, ZZ could be bound
to save-buffers-kill-emacs then post article, etc.")
(put 'viper-vi-local-user-map 'permanent-local t)	

(defvar viper-vi-global-user-map (make-sparse-keymap)
  "Keymap for user-defined global bindings.
These bindings are seen in all Viper buffers.")

(defvar viper-vi-basic-map (make-keymap)
  "This is the main keymap in effect in Viper's Vi state.
This map is global, shared by all buffers.")

(defvar  viper-vi-kbd-map (make-sparse-keymap)
  "This keymap keeps keyboard macros defined via the :map command.")

(defvar viper-vi-diehard-map (make-sparse-keymap)
  "This keymap is in use when the user asks Viper to simulate Vi very closely.
This happens when viper-expert-level is 1 or 2. See viper-set-expert-level.")
  

(viper-deflocalvar viper-insert-local-user-map (make-sparse-keymap)
  "Auxiliary map for per-buffer user-defined keybindings in Insert state.")
(put 'viper-insert-local-user-map 'permanent-local t)	

(defvar viper-insert-global-user-map (make-sparse-keymap)
  "Auxiliary map for global user-defined bindings in Insert state.")

(defvar viper-insert-basic-map (make-sparse-keymap)
  "The basic insert-mode keymap.")

(defvar viper-insert-diehard-map (make-keymap)
  "Map used when user wants vi-style keys in insert mode.
Most of the Emacs keys are suppressed. This map overshadows
viper-insert-basic-map. Not recommended, except for novice users.")

(defvar  viper-insert-kbd-map  (make-sparse-keymap)
  "This keymap keeps VI-style kbd macros for insert mode.")

(defvar viper-replace-map (make-sparse-keymap)
  "Map used in Viper's replace state.")
  
(defvar viper-emacs-global-user-map (make-sparse-keymap)
  "Auxiliary map for global user-defined bindings in Emacs state.")

(defvar  viper-emacs-kbd-map  (make-sparse-keymap)
  "This keymap keeps Vi-style kbd macros for emacs mode.")
  
(viper-deflocalvar viper-emacs-local-user-map  (make-sparse-keymap)
  "Auxiliary map for local user-defined bindings in Emacs state.")
(put 'viper-emacs-local-user-map 'permanent-local t)  

;; This keymap should stay empty
(defvar viper-empty-keymap (make-sparse-keymap))

;; This was the main Vi mode in old versions of VIP which may have been
;; extensively used by VIP users. We declare it as a global var
;; and, after .viper is loaded, we add this keymap to viper-vi-basic-map.
(defvar viper-mode-map (make-sparse-keymap))


;;; Variables used by minor modes

;; Association list of the form 
;; ((major-mode . keymap) (major-mode . keymap) ...)
;; Viper uses these keymaps to make user-requested adjustments
;; to its Vi state in various major modes.")
(defvar viper-vi-state-modifier-alist nil)

;; Association list of the form 
;; ((major-mode . keymap) (major-mode . keymap) ...)
;; Viper uses these keymaps to make user-requested adjustments
;; to its Insert state in various major modes.")
(defvar viper-insert-state-modifier-alist nil)

;; Association list of the form 
;; ((major-mode . keymap) (major-mode . keymap) ...)
;; Viper uses these keymaps to make user-requested adjustments
;; to its Emacs state in various major modes.
(defvar viper-emacs-state-modifier-alist nil)

;; Tells viper-add-local-keys to create a new viper-vi-local-user-map for new
;; buffers. Not a user option.
(viper-deflocalvar viper-need-new-vi-local-map t "")
(put 'viper-need-new-vi-local-map  'permanent-local t)

;; Tells viper-add-local-keys to create a new viper-insert-local-user-map for
;; new buffers. Not a user option.
(viper-deflocalvar viper-need-new-insert-local-map t "")
(put 'viper-need-new-insert-local-map  'permanent-local t)

;; Tells viper-add-local-keys to create a new viper-emacs-local-user-map for
;; new buffers. Not a user option.
(viper-deflocalvar viper-need-new-emacs-local-map t "")
(put 'viper-need-new-emacs-local-map  'permanent-local t)



;; Insert mode keymap

;; for novice users, pretend you are the real vi.
(define-key viper-insert-diehard-map "\t"   'viper-insert-tab)
(define-key viper-insert-diehard-map "\C-a" 'self-insert-command)
(define-key viper-insert-diehard-map "\C-b" 'self-insert-command)
(define-key viper-insert-diehard-map "\C-c" 'viper-change-state-to-vi)
(define-key viper-insert-diehard-map "\C-e" 'self-insert-command)
(define-key viper-insert-diehard-map "\C-f" 'self-insert-command)
(define-key viper-insert-diehard-map "\C-g" 'self-insert-command)
(define-key viper-insert-diehard-map "\C-i" 'self-insert-command)
(define-key viper-insert-diehard-map "\C-k" 'self-insert-command)
(define-key viper-insert-diehard-map "\C-l" 'self-insert-command)
(define-key viper-insert-diehard-map "\C-n" 'self-insert-command)
(define-key viper-insert-diehard-map "\C-o" 'self-insert-command)
(define-key viper-insert-diehard-map "\C-p" 'self-insert-command)
(define-key viper-insert-diehard-map "\C-q" 'self-insert-command)
(define-key viper-insert-diehard-map "\C-r" 'self-insert-command)
(define-key viper-insert-diehard-map "\C-s" 'self-insert-command)
(define-key viper-insert-diehard-map "\C-u" 'viper-erase-line)
(define-key viper-insert-diehard-map "\C-x" 'self-insert-command)
(define-key viper-insert-diehard-map "\C-y" 'self-insert-command)
(define-key viper-insert-diehard-map "\C-z" 'self-insert-command)
(define-key viper-insert-diehard-map "\C-]" 'self-insert-command)
(define-key viper-insert-diehard-map "\C-_" 'self-insert-command)

(let ((i ?\ ))
  (while (<= i ?~)
    (define-key viper-insert-diehard-map (make-string 1 i) 'self-insert-command)
    (setq i (1+ i))))

;; Insert mode map when user wants emacs style
(define-key viper-insert-basic-map "\C-d" 'viper-backward-indent)
(define-key viper-insert-basic-map "\C-w" 'viper-delete-backward-word)
(define-key viper-insert-basic-map "\C-t" 'viper-forward-indent)
(define-key viper-insert-basic-map 
  (if viper-xemacs-p [(shift tab)] [S-tab]) 'viper-insert-tab)
(define-key viper-insert-basic-map "\C-v" 'quoted-insert)
(define-key viper-insert-basic-map "\C-?" 'viper-del-backward-char-in-insert)
(define-key viper-insert-basic-map [backspace] 'viper-del-backward-char-in-insert)
(define-key viper-insert-basic-map "\C-\\" 'viper-alternate-Meta-key)
(define-key viper-insert-basic-map viper-toggle-key 'viper-escape-to-vi)
(define-key viper-insert-basic-map "\C-c\M-p"
  'viper-insert-prev-from-insertion-ring)
(define-key viper-insert-basic-map "\C-c\M-n"
  'viper-insert-next-from-insertion-ring)


;; Replace keymap
(define-key viper-replace-map "\C-t" 'viper-forward-indent)
(define-key viper-replace-map "\C-j" 'viper-replace-state-carriage-return)
(define-key viper-replace-map "\C-m" 'viper-replace-state-carriage-return)
(define-key viper-replace-map "\C-?" 'viper-del-backward-char-in-replace)
(define-key viper-replace-map [backspace] 'viper-del-backward-char-in-replace)



;; Vi keymaps

(define-key viper-vi-basic-map "\C-^" 
  (function (lambda () (interactive) (viper-ex "e#"))))
(define-key viper-vi-basic-map "\C-b" 'viper-scroll-screen-back)
(define-key viper-vi-basic-map "\C-d" 'viper-scroll-up)
(define-key viper-vi-basic-map "\C-e" 'viper-scroll-up-one)
(define-key viper-vi-basic-map "\C-f" 'viper-scroll-screen)
(define-key viper-vi-basic-map "\C-m" 'viper-next-line-at-bol)
(define-key viper-vi-basic-map "\C-u" 'viper-scroll-down)
(define-key viper-vi-basic-map "\C-y" 'viper-scroll-down-one)
(define-key viper-vi-basic-map "\C-s" 'viper-isearch-forward)
(define-key viper-vi-basic-map "\C-r" 'viper-isearch-backward)
(define-key viper-vi-basic-map "\C-c/" 'viper-toggle-search-style)
(define-key viper-vi-basic-map "\C-cg" 'viper-info-on-file)

(define-key viper-vi-basic-map "\C-c\M-p" 'viper-prev-destructive-command)
(define-key viper-vi-basic-map "\C-c\M-n" 'viper-next-destructive-command)


(define-key viper-vi-basic-map " " 'viper-forward-char)
(define-key viper-vi-basic-map "!" 'viper-command-argument)
(define-key viper-vi-basic-map "\"" 'viper-command-argument)
(define-key viper-vi-basic-map "#" 'viper-command-argument)
(define-key viper-vi-basic-map "$" 'viper-goto-eol)
(define-key viper-vi-basic-map "%" 'viper-paren-match)
(define-key viper-vi-basic-map "&"
  (function (lambda () (interactive) (viper-ex "&"))))
(define-key viper-vi-basic-map "'" 'viper-goto-mark-and-skip-white)
(define-key viper-vi-basic-map "(" 'viper-backward-sentence)
(define-key viper-vi-basic-map ")" 'viper-forward-sentence)
(define-key viper-vi-basic-map "*" 'call-last-kbd-macro)
(define-key viper-vi-basic-map "+" 'viper-next-line-at-bol)
(define-key viper-vi-basic-map "," 'viper-repeat-find-opposite)
(define-key viper-vi-basic-map "-" 'viper-previous-line-at-bol)
(define-key viper-vi-basic-map "." 'viper-repeat)
(define-key viper-vi-basic-map "/" 'viper-search-forward)

(define-key viper-vi-basic-map "0" 'viper-beginning-of-line)
(define-key viper-vi-basic-map "1" 'viper-digit-argument)
(define-key viper-vi-basic-map "2" 'viper-digit-argument)
(define-key viper-vi-basic-map "3" 'viper-digit-argument)
(define-key viper-vi-basic-map "4" 'viper-digit-argument)
(define-key viper-vi-basic-map "5" 'viper-digit-argument)
(define-key viper-vi-basic-map "6" 'viper-digit-argument)
(define-key viper-vi-basic-map "7" 'viper-digit-argument)
(define-key viper-vi-basic-map "8" 'viper-digit-argument)
(define-key viper-vi-basic-map "9" 'viper-digit-argument)

(define-key viper-vi-basic-map ":" 'viper-ex)
(define-key viper-vi-basic-map ";" 'viper-repeat-find)
(define-key viper-vi-basic-map "<" 'viper-command-argument)
(define-key viper-vi-basic-map "=" 'viper-command-argument)
(define-key viper-vi-basic-map ">" 'viper-command-argument)
(define-key viper-vi-basic-map "?" 'viper-search-backward)
(define-key viper-vi-basic-map "@" 'viper-register-macro)

(define-key viper-vi-basic-map "A" 'viper-Append)
(define-key viper-vi-basic-map "B" 'viper-backward-Word)
(define-key viper-vi-basic-map "C" 'viper-change-to-eol)
(define-key viper-vi-basic-map "D" 'viper-kill-line)
(define-key viper-vi-basic-map "E" 'viper-end-of-Word)
(define-key viper-vi-basic-map "F" 'viper-find-char-backward)
(define-key viper-vi-basic-map "G" 'viper-goto-line)
(define-key viper-vi-basic-map "H" 'viper-window-top)
(define-key viper-vi-basic-map "I" 'viper-Insert)
(define-key viper-vi-basic-map "J" 'viper-join-lines)
(define-key viper-vi-basic-map "K" 'viper-nil)
(define-key viper-vi-basic-map "L" 'viper-window-bottom)
(define-key viper-vi-basic-map "M" 'viper-window-middle)
(define-key viper-vi-basic-map "N" 'viper-search-Next)
(define-key viper-vi-basic-map "O" 'viper-Open-line)
(define-key viper-vi-basic-map "P" 'viper-Put-back)
(define-key viper-vi-basic-map "Q" 'viper-query-replace)
(define-key viper-vi-basic-map "R" 'viper-overwrite)
(define-key viper-vi-basic-map "S" 'viper-substitute-line)
(define-key viper-vi-basic-map "T" 'viper-goto-char-backward)
(define-key viper-vi-basic-map "U" 'viper-undo)
(define-key viper-vi-basic-map "V" 'find-file-other-window)
(define-key viper-vi-basic-map "W" 'viper-forward-Word)
(define-key viper-vi-basic-map "X" 'viper-delete-backward-char)
(define-key viper-vi-basic-map "Y" 'viper-yank-line)
(define-key viper-vi-basic-map "ZZ" 'viper-save-kill-buffer)

(define-key viper-vi-basic-map "\\" 'viper-escape-to-emacs)
(define-key viper-vi-basic-map "[" 'viper-brac-function)
(define-key viper-vi-basic-map "]" 'viper-ket-function)
(define-key viper-vi-basic-map "\C-\\" 'viper-alternate-Meta-key)
(define-key viper-vi-basic-map "^" 'viper-bol-and-skip-white)
(define-key viper-vi-basic-map "`" 'viper-goto-mark)

(define-key viper-vi-basic-map "a" 'viper-append)
(define-key viper-vi-basic-map "b" 'viper-backward-word)
(define-key viper-vi-basic-map "c" 'viper-command-argument)
(define-key viper-vi-basic-map "d" 'viper-command-argument)
(define-key viper-vi-basic-map "e" 'viper-end-of-word)
(define-key viper-vi-basic-map "f" 'viper-find-char-forward)
(define-key viper-vi-basic-map "g" 'viper-nil)
(define-key viper-vi-basic-map "h" 'viper-backward-char)
(define-key viper-vi-basic-map [backspace] 'viper-backward-char)
(define-key viper-vi-basic-map "i" 'viper-insert)
(define-key viper-vi-basic-map "j" 'viper-next-line)
(define-key viper-vi-basic-map "k" 'viper-previous-line)
(define-key viper-vi-basic-map "l" 'viper-forward-char)
(define-key viper-vi-basic-map "m" 'viper-mark-point)
(define-key viper-vi-basic-map "n" 'viper-search-next)
(define-key viper-vi-basic-map "o" 'viper-open-line)
(define-key viper-vi-basic-map "p" 'viper-put-back)
(define-key viper-vi-basic-map "q" 'viper-nil)
(define-key viper-vi-basic-map "r" 'viper-replace-char)
(define-key viper-vi-basic-map "s" 'viper-substitute)
(define-key viper-vi-basic-map "t" 'viper-goto-char-forward)
(define-key viper-vi-basic-map "u" 'viper-undo)
(define-key viper-vi-basic-map "v" 'find-file)
(define-key viper-vi-basic-map "\C-v" 'find-file-other-frame)
(define-key viper-vi-basic-map "w" 'viper-forward-word)
(define-key viper-vi-basic-map "x" 'viper-delete-char)
(define-key viper-vi-basic-map "y" 'viper-command-argument)
(define-key viper-vi-basic-map "zH" 'viper-line-to-top)
(define-key viper-vi-basic-map "zM" 'viper-line-to-middle)
(define-key viper-vi-basic-map "zL" 'viper-line-to-bottom)
(define-key viper-vi-basic-map "z\C-m" 'viper-line-to-top)
(define-key viper-vi-basic-map "z." 'viper-line-to-middle)
(define-key viper-vi-basic-map "z-" 'viper-line-to-bottom)

(define-key viper-vi-basic-map "{" 'viper-backward-paragraph)
(define-key viper-vi-basic-map "|" 'viper-goto-col)
(define-key viper-vi-basic-map "}" 'viper-forward-paragraph)
(define-key viper-vi-basic-map "~" 'viper-toggle-case)
(define-key viper-vi-basic-map "\C-?" 'viper-backward-char)
(define-key viper-vi-basic-map "_" 'viper-nil)

;;; This is viper-vi-diehard-map. Used when viper-vi-diehard-minor-mode is on.

(define-key viper-vi-diehard-map "\C-a" 'viper-nil)
(define-key viper-vi-diehard-map "\C-c" 'viper-nil)
(define-key viper-vi-diehard-map "\C-g" 'viper-info-on-file)
(define-key viper-vi-diehard-map "\C-i" 'viper-nil)
(define-key viper-vi-diehard-map "\C-k" 'viper-nil)
(define-key viper-vi-diehard-map "\C-l" 'redraw-display)
(define-key viper-vi-diehard-map "\C-n" 'viper-next-line)
(define-key viper-vi-diehard-map "\C-o" 'viper-nil)
(define-key viper-vi-diehard-map "\C-p" 'viper-previous-line)
(define-key viper-vi-diehard-map "\C-q" 'viper-nil)
(define-key viper-vi-diehard-map "\C-r" 'redraw-display)
(define-key viper-vi-diehard-map "\C-s" 'viper-nil)
(define-key viper-vi-diehard-map "\C-t" 'viper-nil)
(define-key viper-vi-diehard-map "\C-v" 'viper-nil)
(define-key viper-vi-diehard-map "\C-w" 'viper-nil)
(define-key viper-vi-diehard-map "@" 'viper-nil)
(define-key viper-vi-diehard-map "_" 'viper-nil)
(define-key viper-vi-diehard-map "*" 'viper-nil)
(define-key viper-vi-diehard-map "#" 'viper-nil)
(define-key viper-vi-diehard-map "\C-_" 'viper-nil)
(define-key viper-vi-diehard-map "\C-]" 'viper-nil) ; This is actually tags.


;;; Minibuffer keymap
  

(defvar viper-minibuffer-map (make-sparse-keymap)
  "Keymap used to modify keys when Minibuffer is in Insert state.")
  
(define-key viper-minibuffer-map "\C-m" 'viper-exit-minibuffer)
(define-key viper-minibuffer-map "\C-j" 'viper-exit-minibuffer)

;; Map used to read Ex-style commands.
(defvar viper-ex-cmd-map (make-sparse-keymap))
(define-key viper-ex-cmd-map " "  'ex-cmd-read-exit)
(define-key viper-ex-cmd-map "\t" 'ex-cmd-complete)

;; Keymap for reading file names in Ex-style commands.
(defvar ex-read-filename-map (make-sparse-keymap))
(define-key ex-read-filename-map " " 'viper-complete-filename-or-exit)
(define-key ex-read-filename-map "!" 'viper-handle-!)

;; Some other maps
(defvar viper-slash-and-colon-map (make-sparse-keymap)
  "This map redefines `/' and `:' to behave as in Vi.
Useful in some modes, such as Gnus, MH, etc.")
(define-key viper-slash-and-colon-map ":" 'viper-ex)
(define-key viper-slash-and-colon-map "/" 'viper-search-forward)

(defvar viper-comint-mode-modifier-map (make-sparse-keymap)
  "This map modifies comint mode.")
(define-key viper-comint-mode-modifier-map "\C-m" 'comint-send-input)
(define-key viper-comint-mode-modifier-map "\C-d" 'comint-delchar-or-maybe-eof)

(defvar viper-dired-modifier-map (make-sparse-keymap)
  "This map modifies Dired behavior.")
(define-key viper-dired-modifier-map ":" 'viper-ex)
(define-key viper-dired-modifier-map "/" 'viper-search-forward)



;;; Code

(defun viper-add-local-keys (state alist)
  "Override some vi-state or insert-state bindings in the current buffer.
The effect is seen in the current buffer only.
Useful for customizing  mailer buffers, gnus, etc.
STATE is 'vi-state, 'insert-state, or 'emacs-state
ALIST is of the form ((key . func) (key . func) ...)
Normally, this would be called from a hook to a major mode or
on a per buffer basis.
Usage:
      (viper-add-local-keys state '((key-str . func) (key-str . func)...))   "
      
  (let (map)
    (cond ((eq state 'vi-state)
	   (if viper-need-new-vi-local-map
	       (setq viper-vi-local-user-map (make-sparse-keymap)))
	   (setq viper-need-new-vi-local-map nil
		 map viper-vi-local-user-map))
	  ((eq state 'insert-state)
	   (if viper-need-new-insert-local-map
	       (setq viper-insert-local-user-map (make-sparse-keymap)))
	   (setq viper-need-new-insert-local-map nil
		 map viper-insert-local-user-map))
	  ((eq state 'emacs-state)
	   (if viper-need-new-emacs-local-map
	       (setq viper-emacs-local-user-map (make-sparse-keymap)))
	   (setq viper-need-new-emacs-local-map nil
		 map viper-emacs-local-user-map))
	  (t 
	   (error
	    "Invalid state in viper-add-local-keys: %S. Valid states: vi-state, insert-state or emacs-state" state)))

    (viper-modify-keymap map alist)
    (viper-normalize-minor-mode-map-alist)
    (viper-set-mode-vars-for viper-current-state)))

(defun viper-zap-local-keys ()
  "Unconditionally reset Viper viper-*-local-user-map's.
Rarely useful, but if u made a mistake by switching to a mode that adds
undesirable local keys, e.g., comint-mode, then this function can restore
sanity."
  (interactive)
  (setq viper-vi-local-user-map (make-sparse-keymap)
	viper-need-new-vi-local-map nil
	viper-insert-local-user-map (make-sparse-keymap)
	viper-need-new-insert-local-map nil
	viper-emacs-local-user-map (make-sparse-keymap)
	viper-need-new-emacs-local-map nil)
  (viper-normalize-minor-mode-map-alist))
    

(defun viper-modify-major-mode (mode state keymap)
  "Modify key bindings in a major-mode in a Viper state using a keymap.

If the default for a major mode is emacs-state, then modifications to this
major mode may not take effect until the buffer switches state to Vi,
Insert or Emacs. If this happens, add viper-change-state-to-emacs to this
major mode's hook. If no such hook exists, you may have to put an advice on
the function that invokes the major mode. See viper-set-hooks for hints.

The above needs not to be done for major modes that come up in Vi or Insert
state by default.

Arguments: (major-mode viper-state keymap)"
  (let ((alist
	 (cond ((eq state 'vi-state) 'viper-vi-state-modifier-alist)
	       ((eq state 'insert-state) 'viper-insert-state-modifier-alist)
	       ((eq state 'emacs-state) 'viper-emacs-state-modifier-alist)))
	elt)
    (if (setq elt (assoc mode (eval alist)))
	(set alist (delq elt (eval alist))))
    (set alist (cons (cons mode keymap) (eval alist)))
    
    ;; Normalization usually doesn't help here, since one needs to
    ;; normalize in the actual buffer where changes to the keymap are
    ;; to take place. However, it doesn't hurt, and it helps whenever this
    ;; function is actually called from within the affected buffer.
    (viper-normalize-minor-mode-map-alist)
    
    (viper-set-mode-vars-for viper-current-state)))

    
;; Displays variables that control Viper's keymaps
(defun viper-debug-keymaps ()
  (interactive)
  (with-output-to-temp-buffer " *viper-debug*"
    (princ (format "Buffer name:  %s\n\n" (buffer-name)))
    (princ "Variables:  \n")
    (princ (format "major-mode:  %S\n" major-mode))
    (princ (format "viper-current-state:  %S\n" viper-current-state))
    (princ (format "viper-mode-string:  %S\n\n" viper-mode-string))
    (princ (format "viper-vi-intercept-minor-mode:  %S\n"
		   viper-vi-intercept-minor-mode))
    (princ (format "viper-insert-intercept-minor-mode:  %S\n"
		   viper-insert-intercept-minor-mode))
    (princ (format "viper-emacs-intercept-minor-mode:  %S\n"
		   viper-emacs-intercept-minor-mode))
    (princ (format "viper-vi-minibuffer-minor-mode:  %S\n"
		   viper-vi-minibuffer-minor-mode))
    (princ (format "viper-insert-minibuffer-minor-mode:  %S\n\n"
		   viper-insert-minibuffer-minor-mode))
    (princ (format "viper-vi-local-user-minor-mode:  %S\n"
		   viper-vi-local-user-minor-mode))
    (princ (format "viper-vi-global-user-minor-mode:  %S\n"
		   viper-vi-global-user-minor-mode))
    (princ (format "viper-vi-kbd-minor-mode:  %S\n" viper-vi-kbd-minor-mode))
    (princ (format "viper-vi-state-modifier-minor-mode:  %S\n"
		   viper-vi-state-modifier-minor-mode))
    (princ (format "viper-vi-diehard-minor-mode:  %S\n"
		   viper-vi-diehard-minor-mode))
    (princ (format "viper-vi-basic-minor-mode:  %S\n" viper-vi-basic-minor-mode))
    (princ (format "viper-replace-minor-mode:  %S\n" viper-replace-minor-mode))
    (princ (format "viper-insert-local-user-minor-mode:  %S\n"
		   viper-insert-local-user-minor-mode))
    (princ (format "viper-insert-global-user-minor-mode:  %S\n"
		   viper-insert-global-user-minor-mode))
    (princ (format "viper-insert-kbd-minor-mode:  %S\n"
		   viper-insert-kbd-minor-mode)) 
    (princ (format "viper-insert-state-modifier-minor-mode:  %S\n"
		   viper-insert-state-modifier-minor-mode))
    (princ (format "viper-insert-diehard-minor-mode:  %S\n"
		   viper-insert-diehard-minor-mode))
    (princ (format "viper-insert-basic-minor-mode:  %S\n"
		   viper-insert-basic-minor-mode))
    (princ (format "viper-emacs-local-user-minor-mode:  %S\n"
		   viper-emacs-local-user-minor-mode))
    (princ (format "viper-emacs-kbd-minor-mode:  %S\n"
		   viper-emacs-kbd-minor-mode))
    (princ (format "viper-emacs-global-user-minor-mode:  %S\n"
		   viper-emacs-global-user-minor-mode))
    (princ (format "viper-emacs-state-modifier-minor-mode:  %S\n"
		   viper-emacs-state-modifier-minor-mode))
    
    (princ (format "\nviper-expert-level  %S\n" viper-expert-level))
    (princ (format "viper-no-multiple-ESC  %S\n" viper-no-multiple-ESC))
    (princ (format "viper-always  %S\n" viper-always))
    (princ (format "viper-ex-style-motion  %S\n"
		   viper-ex-style-motion))
    (princ (format "viper-ex-style-editing  %S\n"
		   viper-ex-style-editing))
    (princ (format "viper-want-emacs-keys-in-vi  %S\n"
		   viper-want-emacs-keys-in-vi)) 
    (princ (format "viper-want-emacs-keys-in-insert  %S\n"
		   viper-want-emacs-keys-in-insert)) 
    (princ (format "viper-want-ctl-h-help  %S\n" viper-want-ctl-h-help))
    
    (princ "\n\n\n")
    (princ (format "Default value for minor-mode-map-alist:  \n%S\n\n"
		   (default-value 'minor-mode-map-alist)))
    (princ (format "Actual value for minor-mode-map-alist:  \n%S\n"
		   minor-mode-map-alist))
    ))
   

;;; Keymap utils
	     
(defun viper-add-keymap (mapsrc mapdst) 
  "Add contents of mapsrc to mapdst. It is assumed that mapsrc is sparse."
  (if viper-xemacs-p
      (map-keymap (function (lambda (key binding)
			      (define-key mapdst key binding)))
		  mapsrc)
    (mapcar 
     (function (lambda (p) 
		 (define-key mapdst (vector (car p)) (cdr p))
		 ))
     (cdr mapsrc))))
  
(defun viper-modify-keymap (map alist)
   "Modifies MAP with bindings specified in the ALIST. The alist has the
form ((key . function) (key . function) ... )."
   (mapcar (function (lambda (p)
		       (define-key map (eval (car p)) (cdr p)))) 
	   alist))


;;; Local Variables:
;;; eval: (put 'viper-deflocalvar 'lisp-indent-hook 'defun)
;;; End:


;;;  viper-keym.el ends here