--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/lisp/viper/viper-init.el	Mon Aug 13 08:49:20 2007 +0200
@@ -0,0 +1,674 @@
+;;; viper-init.el --- some common definitions for Viper
+
+;; Copyright (C) 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-init)
+
+;; compiler pacifier
+(defvar mark-even-if-inactive)
+;; end pacifier
+
+;; Is it XEmacs?
+(defconst vip-xemacs-p (string-match "\\(Lucid\\|XEmacs\\)" emacs-version))
+;; Is it Emacs?
+(defconst vip-emacs-p (not vip-xemacs-p))
+;; Tell whether we are running as a window application or on a TTY
+(defsubst vip-device-type ()
+  (if vip-emacs-p
+      window-system
+    (device-type (selected-device))))
+;; in XEmacs: device-type is tty on tty and stream in batch.
+(defun vip-window-display-p ()
+  (and (vip-device-type) (not (memq (vip-device-type) '(tty stream pc)))))
+
+(defvar vip-ms-style-os-p (memq system-type '(ms-dos windows-nt windows-95))
+  "Tells if Emacs is running under an MS-style OS: ms-dos, windows-nt, W95.")
+(defvar vip-vms-os-p (memq system-type '(vax-vms axp-vms))
+  "Tells if Emacs is running under VMS.")
+
+(defvar vip-force-faces nil
+  "If t, Viper will think that it is running on a display that supports faces.
+This is provided as a temporary relief for users of face-capable displays
+that Viper doesn't know about.")
+
+(defun vip-has-face-support-p ()
+  (cond ((vip-window-display-p))
+	(vip-force-faces)
+	(vip-emacs-p (memq (vip-device-type) '(pc)))
+	(vip-xemacs-p (memq (vip-device-type) '(tty pc)))))
+
+(defun vip-convert-standard-file-name (fname)
+  (if vip-emacs-p
+      (convert-standard-filename fname)
+    ;; hopefully, XEmacs adds this functionality
+    fname))
+
+
+;;; Macros
+
+(defmacro vip-deflocalvar (var default-value &optional documentation)
+  (` (progn
+       (defvar (, var) (, default-value)
+	       (, (format "%s\n\(buffer local\)" documentation)))
+       (make-variable-buffer-local '(, var))
+     )))
+
+(defmacro vip-loop (count body)
+  "(vip-loop COUNT BODY) Execute BODY COUNT times."
+  (list 'let (list (list 'count count))
+	(list 'while '(> count 0)
+	      body
+	      '(setq count (1- count))
+	      )))
+
+(defmacro vip-buffer-live-p (buf)
+  (` (and (, buf) (get-buffer (, buf)) (buffer-name (get-buffer (, buf))))))
+  
+;; return buffer-specific macro definition, given a full macro definition
+(defmacro vip-kbd-buf-alist (macro-elt)
+  (` (nth 1 (, macro-elt))))
+;; get a pair: (curr-buffer . macro-definition)
+(defmacro vip-kbd-buf-pair (macro-elt)
+  (` (assoc (buffer-name) (vip-kbd-buf-alist (, macro-elt)))))
+;; get macro definition for current buffer
+(defmacro vip-kbd-buf-definition (macro-elt)
+  (` (cdr (vip-kbd-buf-pair (, macro-elt)))))
+  
+;; return mode-specific macro definitions, given a full macro definition
+(defmacro vip-kbd-mode-alist (macro-elt)
+  (` (nth 2 (, macro-elt))))
+;; get a pair: (major-mode . macro-definition)
+(defmacro vip-kbd-mode-pair (macro-elt)
+  (` (assoc major-mode (vip-kbd-mode-alist (, macro-elt)))))
+;; get macro definition for the current major mode
+(defmacro vip-kbd-mode-definition (macro-elt)
+  (` (cdr (vip-kbd-mode-pair (, macro-elt)))))
+  
+;; return global macro definition, given a full macro definition
+(defmacro vip-kbd-global-pair (macro-elt)
+  (` (nth 3 (, macro-elt))))
+;; get global macro definition from an elt of macro-alist
+(defmacro vip-kbd-global-definition (macro-elt)
+  (` (cdr (vip-kbd-global-pair (, macro-elt)))))
+  
+;; last elt of a sequence
+(defsubst vip-seq-last-elt (seq)
+  (elt seq (1- (length seq))))
+  
+
+(defvar vip-minibuffer-overlay-priority 300)
+(defvar vip-replace-overlay-priority 400)
+(defvar vip-search-overlay-priority 500)
+  
+
+;;; Viper minor modes
+
+;; This is not local in Emacs, so we make it local.
+;; This must be local because although the stack of minor modes can be the same
+;; for all buffers, the associated *keymaps* can be different. In Viper,
+;; vip-vi-local-user-map, vip-insert-local-user-map, and others can have
+;; different keymaps for different buffers.
+;; Also, the keymaps associated with vip-vi/insert-state-modifier-minor-mode
+;; can be different.
+(make-variable-buffer-local 'minor-mode-map-alist)
+
+;; Mode for vital things like \e, C-z.
+(vip-deflocalvar vip-vi-intercept-minor-mode nil)
+
+(vip-deflocalvar vip-vi-basic-minor-mode nil
+  "Viper's minor mode for Vi bindings.")
+  
+(vip-deflocalvar vip-vi-local-user-minor-mode nil
+  "Auxiliary minor mode for user-defined local bindings in Vi state.")
+
+(vip-deflocalvar vip-vi-global-user-minor-mode nil
+  "Auxiliary minor mode for user-defined global bindings in Vi state.")
+
+(vip-deflocalvar vip-vi-state-modifier-minor-mode nil
+  "Minor mode used to make major-mode-specific modification to Vi state.")
+
+(vip-deflocalvar vip-vi-diehard-minor-mode nil
+  "This minor mode is in effect when the user wants Viper to be Vi.")
+
+(vip-deflocalvar vip-vi-kbd-minor-mode nil
+  "Minor mode for Ex command macros in Vi state.
+The corresponding keymap stores key bindings of Vi macros defined with
+the Ex command :map.")
+
+;; Mode for vital things like \e, C-z.
+(vip-deflocalvar vip-insert-intercept-minor-mode nil)
+
+(vip-deflocalvar vip-insert-basic-minor-mode nil
+  "Viper's minor mode for bindings in Insert mode.")
+
+(vip-deflocalvar vip-insert-local-user-minor-mode nil
+  "Auxiliary minor mode for buffer-local user-defined bindings in Insert state.
+This is a way to overshadow normal Insert mode bindings locally to certain
+designated buffers.")
+
+(vip-deflocalvar vip-insert-global-user-minor-mode nil
+  "Auxiliary minor mode for global user-defined bindings in Insert state.")
+
+(vip-deflocalvar vip-insert-state-modifier-minor-mode nil
+  "Minor mode used to make major-mode-specific modification to Insert state.")
+
+(vip-deflocalvar vip-insert-diehard-minor-mode nil
+  "Minor mode that simulates Vi very closely.
+Not recommened, except for the novice user.")
+
+(vip-deflocalvar vip-insert-kbd-minor-mode nil
+"Minor mode for Ex command macros Insert state.
+The corresponding keymap stores key bindings of Vi macros defined with
+the Ex command :map!.")
+
+(vip-deflocalvar vip-replace-minor-mode nil
+  "Minor mode in effect in replace state (cw, C, and the like commands).")
+
+;; Mode for vital things like \C-z and \C-x)
+;; This is t, by default. So, any new buffer will have C-z defined as
+;; switch to Vi, unless we switched states in this buffer
+(vip-deflocalvar vip-emacs-intercept-minor-mode t)
+  
+(vip-deflocalvar vip-emacs-local-user-minor-mode t
+  "Minor mode for local user bindings effective in Emacs state.
+Users can use it to override Emacs bindings when Viper is in its Emacs
+state.")  
+  
+(vip-deflocalvar vip-emacs-global-user-minor-mode t
+  "Minor mode for global user bindings in effect in Emacs state.
+Users can use it to override Emacs bindings when Viper is in its Emacs
+state.")  
+
+(vip-deflocalvar vip-emacs-kbd-minor-mode t
+  "Minor mode for Vi style macros in Emacs state.
+The corresponding keymap stores key bindings of Vi macros defined with
+`vip-record-kbd-macro' command. There is no Ex-level command to do this
+interactively.")
+
+(vip-deflocalvar vip-emacs-state-modifier-minor-mode t
+  "Minor mode used to make major-mode-specific modification to Emacs state.
+For instance, a Vi purist may want to bind `dd' in Dired mode to a function
+that deletes a file.")
+
+(vip-deflocalvar vip-vi-minibuffer-minor-mode nil
+   "Minor mode that forces Vi-style when the Minibuffer is in Vi state.")
+
+(vip-deflocalvar vip-insert-minibuffer-minor-mode nil
+   "Minor mode that forces Vi-style when the Minibuffer is in Insert state.")
+  
+
+
+;; Some common error messages
+
+(defconst vip-SpuriousText "Spurious text after command"  "")
+(defconst vip-BadExCommand "Not an editor command"   "")
+(defconst vip-InvalidCommandArgument "Invalid command argument"   "")
+(defconst vip-NoPrevSearch "No previous search string"   "")
+(defconst vip-EmptyRegister "`%c': Nothing in this register"   "")
+(defconst vip-InvalidRegister "`%c': Invalid register"   "")
+(defconst vip-EmptyTextmarker "`%c': Text marker doesn't point anywhere"   "")
+(defconst vip-InvalidTextmarker "`%c': Invalid text marker"   "")
+(defconst vip-InvalidViCommand "Invalid command"   "")
+(defconst vip-BadAddress "Ill-formed address"   "")
+(defconst vip-FirstAddrExceedsSecond "First address exceeds second"   "")
+(defconst vip-NoFileSpecified "No file specified"   "")
+
+;; Is t until viper-mode executes for the very first time. 
+;; Prevents recursive descend into startup messages.
+(defvar vip-first-time t)
+
+(defvar vip-expert-level 0
+  "User's expert level.
+The minor mode vip-vi-diehard-minor-mode is in effect when
+vip-expert-level is 1 or 2 or when vip-want-emacs-keys-in-vi is t.
+The minor mode vip-insert-diehard-minor-mode is in effect when
+vip-expert-level is 1 or 2 or if vip-want-emacs-keys-in-insert is t.
+Use `M-x vip-set-expert-level' to change this.")
+
+;; Max expert level supported by Viper. This is NOT a user option.
+;; It is here to make it hard for the user from resetting it.
+(defconst vip-max-expert-level 5)
+
+;; Contains user settings for vars affected by vip-set-expert-level function.
+;; Not a user option.
+(defvar vip-saved-user-settings nil)
+	       
+
+;;; ISO characters
+  
+(vip-deflocalvar vip-automatic-iso-accents nil
+  "*If non-nil, ISO accents will be turned on in insert/replace emacs states and turned off in vi-state. 
+For some users, this behavior may be too primitive. In this case, use
+insert/emacs/vi state hooks.")
+  
+
+;; VI-style Undo
+
+;; Used to 'undo' complex commands, such as replace and insert commands.
+(vip-deflocalvar vip-undo-needs-adjustment nil)
+(put 'vip-undo-needs-adjustment 'permanent-local t)
+
+;; A mark that Viper puts on buffer-undo-list.  Marks the beginning of a
+;; complex command that must be undone atomically. If inserted, it is
+;; erased by vip-change-state-to-vi and vip-repeat.
+(defconst vip-buffer-undo-list-mark 'viper)
+
+(defvar vip-keep-point-on-undo nil
+  "*Non-nil means not to move point while undoing commands.
+This style is different from Emacs and Vi. Try it to see if
+it better fits your working style.")  
+
+;; Replace mode and changing text
+
+;; Viper's own after/before change functions, which get vip-add-hook'ed to
+;; Emacs's
+(vip-deflocalvar vip-after-change-functions nil "")
+(vip-deflocalvar vip-before-change-functions nil "")
+(vip-deflocalvar vip-post-command-hooks nil "")
+(vip-deflocalvar vip-pre-command-hooks nil "")
+
+;; Can be used to pass global states around for short period of time
+(vip-deflocalvar vip-intermediate-command nil "")
+
+;; Indicates that the current destructive command has started in replace mode.
+(vip-deflocalvar vip-began-as-replace nil "")
+
+(defvar vip-allow-multiline-replace-regions t
+  "If non-nil, Viper will allow multi-line replace regions.
+This is an extension to standard Vi.
+If nil, commands that attempt to replace text spanning multiple lines first
+delete the text being replaced, as in standard Vi.")
+
+(defvar vip-replace-overlay-cursor-color "Red"
+  "*Cursor color to use in Replace state")
+(defvar vip-insert-state-cursor-color nil
+  "Cursor color for Viper insert state.")
+(put 'vip-insert-state-cursor-color 'permanent-local t)
+;; place to save cursor colow when switching to insert mode
+(vip-deflocalvar vip-saved-cursor-color nil "")
+  
+(vip-deflocalvar vip-replace-overlay nil "")
+(put 'vip-replace-overlay 'permanent-local t)
+
+(defvar vip-replace-overlay-pixmap "gray3"
+  "Pixmap to use for search face on non-color displays.")
+(defvar vip-search-face-pixmap "gray3"
+  "Pixmap to use for search face on non-color displays.")
+
+
+(defvar vip-replace-region-end-delimiter "$"
+  "A string marking the end of replacement regions.
+It is used only with TTYs or if `vip-use-replace-region-delimiters'
+is non-nil.")
+(defvar vip-replace-region-start-delimiter ""
+  "A string marking the beginning of replacement regions.
+It is used only with TTYs or if `vip-use-replace-region-delimiters'
+is non-nil.")
+(defvar vip-use-replace-region-delimiters (not (vip-has-face-support-p))
+  "*If non-nil, Viper will always use `vip-replace-region-end-delimiter' and
+`vip-replace-region-start-delimiter' to delimit replacement regions, even on
+color displays. By default, the delimiters are used only on TTYs.")
+  
+;; XEmacs requires glyphs
+(if vip-xemacs-p
+    (progn
+      (or (glyphp vip-replace-region-end-delimiter)
+	  (setq vip-replace-region-end-delimiter
+		(make-glyph vip-replace-region-end-delimiter)))
+      (or (glyphp vip-replace-region-start-delimiter)
+	  (setq vip-replace-region-start-delimiter
+		(make-glyph vip-replace-region-start-delimiter)))
+      ))
+      
+  
+;; These are local marker that must be initialized to nil and moved with
+;; `vip-move-marker-locally'
+;;
+;; Remember the last position inside the replace region.
+(vip-deflocalvar vip-last-posn-in-replace-region nil)
+;; Remember the last position while inserting
+(vip-deflocalvar vip-last-posn-while-in-insert-state nil)
+(put 'vip-last-posn-in-replace-region 'permanent-local t)
+(put 'vip-last-posn-while-in-insert-state 'permanent-local t)
+
+(vip-deflocalvar vip-sitting-in-replace nil "")
+(put 'vip-sitting-in-replace 'permanent-local t)
+  
+;; Remember the number of characters that have to be deleted in replace
+;; mode to compensate for the inserted characters.
+(vip-deflocalvar vip-replace-chars-to-delete 0 "")
+(vip-deflocalvar vip-replace-chars-deleted 0 "")
+
+;; Insertion ring and command ring
+(defvar vip-insertion-ring-size 14
+  "The size of the insertion ring.")
+;; The insertion ring.
+(defvar vip-insertion-ring nil)
+;; This is temp insertion ring. Used to do rotation for display purposes.
+;; When rotation just started, it is initialized to vip-insertion-ring.
+(defvar vip-temp-insertion-ring nil)
+(defvar vip-last-inserted-string-from-insertion-ring "")
+
+(defvar vip-command-ring-size 14
+  "The size of the command ring.")
+;; The command ring.
+(defvar vip-command-ring nil)
+;; This is temp command ring. Used to do rotation for display purposes.
+;; When rotation just started, it is initialized to vip-command-ring.
+(defvar vip-temp-command-ring nil)
+
+;; Modes and related variables
+
+;; Current mode.  One of: `emacs-state', `vi-state', `insert-state'
+(vip-deflocalvar vip-current-state 'emacs-state)
+
+
+;; Autoindent in insert
+
+;; Variable that keeps track of whether C-t has been pressed.
+(vip-deflocalvar vip-cted nil "")
+
+;; Preserve the indent value, used by C-d in insert mode.
+(vip-deflocalvar vip-current-indent 0)
+
+;; Whether to preserve the indent, used by C-d in insert mode.
+(vip-deflocalvar vip-preserve-indent nil)
+
+(vip-deflocalvar vip-auto-indent nil
+  "*Autoindent if t.")
+(vip-deflocalvar vip-electric-mode t
+  "*If t, enable electric behavior. 
+Currently only enables auto-indentation `according to mode'.")
+
+(defconst vip-shift-width 8
+  "*The shiftwidth variable.")
+
+;; Variables for repeating destructive commands
+
+(defconst vip-keep-point-on-repeat t
+  "*If t, don't move point when repeating previous command.
+This is useful for doing repeated changes with the '.' key.
+The user can change this to nil, if she likes when the cursor moves
+to a new place after repeating previous Vi command.") 
+
+;; Remember insert point as a marker.  This is a local marker that must be
+;; initialized to nil and moved with `vip-move-marker-locally'.
+(vip-deflocalvar vip-insert-point nil)
+(put 'vip-insert-point 'permanent-local t)
+
+;; This remembers the point before dabbrev-expand was called.
+;; If vip-insert-point turns out to be bigger than that, it is reset
+;; back to vip-pre-command-point.
+;; The reason this is needed is because dabbrev-expand (and possibly
+;; others) may jump to before the insertion point, delete something and
+;; then reinsert a bigger piece. For instance:  bla^blo
+;; If dabbrev-expand is called after `blo' and ^ undicates vip-insert-point,
+;; then point jumps to the beginning of `blo'. If expansion is found, `blablo'
+;; is deleted, and we have |^, where | denotes point. Next, dabbrev-expand
+;; will insert the expansion, and we get: blablo^
+;; Whatever we insert next goes before the ^, i.e., before the
+;; vip-insert-point marker. So, Viper will think that nothing was
+;; inserted. Remembering the orig position of the marker circumvents the
+;; problem.
+;; We don't know of any command, except dabbrev-expand, that has the same
+;; problem. However, the same trick can be used if such a command is
+;; discovered later.
+;;
+(vip-deflocalvar vip-pre-command-point nil)
+(put 'vip-pre-command-point 'permanent-local t) ; this is probably an overkill
+
+;; This is used for saving inserted text.
+(defvar vip-last-insertion  nil)
+  
+;; Remembers the last replaced region.
+(defvar vip-last-replace-region "")
+  
+;; Remember com point as a marker.
+;; This is a local marker. Should be moved with `vip-move-marker-locally'
+(vip-deflocalvar vip-com-point nil)
+
+;; If non-nil, the value is a list (M-COM VAL COM REG inserted-text cmd-keys)
+;; It is used to re-execute last destructive command.
+;; M-COM is a Lisp symbol representing the function to be executed.
+;; VAL is the prefix argument that was used with that command.
+;; COM is an internal descriptor, such as ?r, ?c, ?C, which contains
+;; additional information on how the function in M-COM is to be handled.
+;; REG is the register used by command
+;; INSERTED-TEXT is text inserted by that command (in case of o, c, C, i, r
+;; commands).
+;; COMMAND-KEYS are the keys that were typed to invoke the command.
+(defvar vip-d-com nil)
+
+;; The character remembered by the Vi `r' command.
+(defvar vip-d-char nil)
+
+;; Name of register to store deleted or yanked strings
+(defvar vip-use-register nil)
+
+
+
+;; Variables for Moves and Searches
+
+;; For use by `;' command.
+(defvar vip-f-char nil)
+
+;; For use by `.' command.
+(defvar vip-F-char nil)
+
+;; For use by `;' command.
+(defvar vip-f-forward nil)
+
+;; For use by `;' command.
+(defvar vip-f-offset nil)
+
+;; Last search string
+(defvar vip-s-string "")
+
+(defvar vip-quote-string "> "
+  "String inserted at the beginning of quoted region.")
+
+;; If t, search is forward.
+(defvar vip-s-forward nil)
+
+(defconst vip-case-fold-search nil
+  "*If not nil, search ignores cases.")
+
+(defconst vip-re-search t
+  "*If not nil, search is reg-exp search, otherwise vanilla search.")
+
+(defvar vip-search-scroll-threshold 2
+  "*If search lands within this threshnold from the window top/bottom,
+the window will be scrolled up or down appropriately, to reveal context.
+If you want Viper search to behave as usual in Vi, set this variable to a
+negative number.")
+
+(defconst vip-re-query-replace t
+  "*If t then do regexp replace, if nil then do string replace.")
+
+(defconst vip-re-replace t
+  "*If t, do regexp replace. nil means do string replace.")
+
+(vip-deflocalvar vip-ex-style-motion t
+  "*Ex-style: the commands l,h do not cross lines, etc.")
+
+(vip-deflocalvar vip-ex-style-editing-in-insert t
+  "*The keys ^H, ^? don't jump lines in insert, ESC moves cursor back, etc.
+Note: this doesn't preclude ^H and ^? from deleting characters by moving
+past the insertion point. This is a feature, not a bug. ")
+
+(vip-deflocalvar vip-delete-backwards-in-replace nil
+  "*If t, DEL key will delete characters while moving the cursor backwards.
+If nil, the cursor will move backwards without deleting anything.")
+
+(defconst vip-buffer-search-char nil
+  "*Key bound for buffer-searching.")
+
+(defconst vip-search-wrap-around-t t
+  "*If t, search wraps around.")
+  
+(vip-deflocalvar vip-related-files-and-buffers-ring nil
+  "*Ring of file and buffer names that are considered to be related to the
+current buffer.
+These buffers can be cycled through via :R and :P commands.")
+(put 'vip-related-files-and-buffers-ring 'permanent-local t)
+
+;; Used to find out if we are done with searching the current buffer.
+(vip-deflocalvar vip-local-search-start-marker nil)
+;; As above, but global
+(defvar vip-search-start-marker (make-marker))
+
+;; the search overlay
+(vip-deflocalvar vip-search-overlay nil)
+
+
+(defvar vip-heading-start 
+  (concat "^\\s-*(\\s-*defun\\s-\\|"			        ; lisp
+	  "^{\\s-*$\\|^[_a-zA-Z][^()]*[()].*{\\s-*$\\|"	        ; C/C++
+	  "^\\s-*class.*{\\|^\\s-*struct.*{\\|^\\s-*enum.*{\\|"
+	  "^\\\\[sb][a-z]*{.*}\\s-*$\\|"	    		; latex
+	  "^@node\\|@table\\|^@m?enu\\|^@itemize\\|^@if\\|"	; texinfo
+	  "^.+:-")			                        ; prolog
+  "*Regexps for Headings. Used by \[\[ and \]\].")
+
+(defvar vip-heading-end 
+  (concat "^}\\|"						; C/C++
+	  "^\\\\end{\\|"					; latex
+	  "^@end \\|"						; texinfo
+	  ")\n\n[ \t\n]*\\|"					; lisp
+	  "\\.\\s-*$")						; prolog
+      "*Regexps to end Headings/Sections. Used by \[\].")
+
+
+;; These two vars control the interaction of jumps performed by ' and `.
+;; In this new version, '' doesn't erase the marks set by ``, so one can
+;; use both kinds of jumps interchangeably and without loosing positions
+;; inside the lines.
+
+;; Remembers position of the last jump done using ``'.
+(vip-deflocalvar vip-last-jump  nil)
+;; Remembers position of the last jump done using `''.
+(vip-deflocalvar vip-last-jump-ignore 0)
+
+;; History variables
+
+;; History of search strings.
+(defvar vip-search-history  (list ""))
+;; History of query-replace strings used as a source.
+(defvar vip-replace1-history nil)
+;; History of query-replace strings used as replacement.
+(defvar vip-replace2-history nil)
+;; History of region quoting strings.
+(defvar vip-quote-region-history (list vip-quote-string))
+;; History of Ex-style commands.
+(defvar vip-ex-history nil)
+;; History of shell commands.
+(defvar vip-shell-history nil)
+
+
+;; Last shell command. There are two of these, one for Ex (in viper-ex)
+;; and one for Vi.
+
+;; Last shell command executed with ! command.
+(defvar vip-last-shell-com nil)
+
+
+
+;;; Miscellaneous
+
+;; don't bark when mark is inactive
+(setq mark-even-if-inactive t)
+
+(defvar vip-inhibit-startup-message nil
+  "Whether Viper startup message should be inhibited.")
+
+(defvar vip-always t
+  "t means, arrange that vi-state will be a default.")
+
+(defvar vip-custom-file-name (vip-convert-standard-file-name "~/.vip")
+  "Viper customisation file.
+This variable must be set _before_ loading Viper.")
+
+
+(defvar vip-spell-function 'ispell-region
+  "Spell function used by #s<move> command to spell.")
+
+(defvar vip-tags-file-name "TAGS"
+  "The tags file used by Viper.")
+
+;; Indicates if we are in the middle of executing a command that takes another
+;; command as an argument, e.g., cw, dw, etc.
+(defvar vip-inside-command-argument-action nil)
+
+;; Minibuffer
+
+(defvar vip-vi-style-in-minibuffer t
+  "If t, use vi-style editing in minibuffer.
+Should be set in `~/.vip' file.")
+  
+;; overlay used in the minibuffer to indicate which state it is in
+(vip-deflocalvar vip-minibuffer-overlay nil)
+
+;; Hook, specific to Viper, which is run just *before* exiting the minibuffer.
+;; Beginning with Emacs 19.26, the standard `minibuffer-exit-hook' is run
+;; *after* exiting the minibuffer
+(defvar vip-minibuffer-exit-hook nil)
+
+;; setup emacs-supported vi-style feel
+(setq next-line-add-newlines nil
+      require-final-newline t)
+
+(make-variable-buffer-local 'require-final-newline)
+       
+
+;; Mode line
+(defconst vip-vi-state-id  	"<V> "
+  "Mode line tag identifying the Vi mode of Viper.")
+(defconst vip-emacs-state-id	"<E> "
+  "Mode line tag identifying the Emacs mode of Viper.")
+(defconst vip-insert-state-id	"<I> "
+  "Mode line tag identifying the Insert mode of Viper.")
+(defconst vip-replace-state-id	"<R> "
+  "Mode line tag identifying the Replace mode of Viper.")
+
+;; Viper changes the default mode-line-buffer-identification
+(setq-default mode-line-buffer-identification '(" %b"))
+
+;; Variable displaying the current Viper state in the mode line.
+(vip-deflocalvar vip-mode-string vip-emacs-state-id)
+(or (memq 'vip-mode-string global-mode-string)
+    (setq global-mode-string
+	  (append '("" vip-mode-string) (cdr global-mode-string))))
+
+
+(defvar vip-vi-state-hook nil
+  "*Hooks run just before the switch to Vi mode is completed.")
+(defvar vip-insert-state-hook nil
+  "*Hooks run just before the switch to Insert mode is completed.")
+(defvar vip-replace-state-hook nil
+  "*Hooks run just before the switch to Replace mode is completed.")
+(defvar vip-emacs-state-hook nil
+  "*Hooks run just before the switch to Emacs mode is completed.")
+  
+(defvar vip-load-hook nil
+  "Hooks run just after loading Viper.")
+  
+;;;  viper-ex.el ends here