toolbar-x.el

		   val
		 (if (integerp val)
		     (list val)
		   (list 1)))
	     ;; then, type is radio
	     (if (integerp val)
		 val
	       (if (and val
			(listp val)
			(integerp (car val)))
		   (car val)
		 1)))))
    ;; === buiding `list-strings' and `list-buttons' ===
    ;; if only symbols, build `list-strings' and `list-buttons' from symbols
    (if (let ((only-symbols-flag t))
	  (dolist (i dropdown-list only-symbols-flag)
	    (setq only-symbols-flag (and only-symbols-flag (symbolp i)))))
	(let ((count 0))
	  (dolist (i dropdown-list)
	    ;; list-strings and list-buttons are buildt reversed
	    (setq list-strings (cons (toolbarx-make-string-from-symbol i)
				     list-strings))
	    (setq count (1+ count))
	    (setq list-buttons (cons (list i
					   :insert
					   (if (eq type 'radio)
					       (list 'eq count variable)
					     (list 'memq count variable)))
				     list-buttons))))
      ;; if not, the it must start with string
      (unless (stringp (car dropdown-list))
	(error "%s %s %s"
	       "If not all itens on dropdown are symbols, then a string"
	       "must come before each set of buttons; no string found"
	       "in first position."))
      (let ((count 0)
	    (elem)
	    (temp-list-buttons))
	(while dropdown-list
	  (setq elem (car dropdown-list))
	  (setq dropdown-list (cdr dropdown-list))
	  (if (stringp elem)
	      ;; if string, output `temp-list-buttons' and prepair it again
	      (progn
		;; list-strings and list-buttons are buildt reversed
		(setq list-strings (cons elem list-strings))
		(when temp-list-buttons
		  (setq list-buttons (cons (append (nreverse temp-list-buttons)
						   (list :insert
							 (if (eq type 'radio)
							     (list 'eq count
								   variable)
							   (list 'memq count
								 variable))))
					   list-buttons)))
		(setq temp-list-buttons nil)
		(setq count (1+ count)))
	    ;; else, if not string, just insert it to `temp-list-buttons'
	    ;; which is also buildt reversed
	    (setq temp-list-buttons (cons elem temp-list-buttons))))
	;; output last temp list, left behind
	(when temp-list-buttons
	  (setq list-buttons (cons (append (nreverse
					    temp-list-buttons)
					   (list
					    :insert (if (eq type 'radio)
							(list 'eq count
							      variable)
						      (list 'memq count
							    variable))))
				   list-buttons)))))
    ;; lists were made reversed (elements inserted at the beginning)
    (setq list-strings (nreverse list-strings))
    (setq list-buttons (nreverse list-buttons))
    ;; now, pass `list-buttons' as a group to `toolbarx-process-group'
    (let ((current-switches switches))
      (setq current-switches
	    (toolbarx-process-group list-buttons meaning-alist
				    merged-props ; pass non-processed props
				    current-switches))
      (setq current-switches
	    ;; outputing dropdown button
	    (toolbarx-process-group (append dropdown-button-without-command
					    (list :command
						  (toolbarx-mount-popup-menu
						   list-strings variable type
						   title save)))
				    meaning-alist merged-props-button-only
				    switches))
      current-switches)))



;; Still functions `toolbarx-install-toolbar' and `toolbarx-refresh'to
;; complete the parsing engine.	 Since they interface with other engines,
;; they must come in the end.

;;; How a image is made, giving a string as (part of) file name.

;; look at function `image-type-available-p' for Emacs !!!!

(defun toolbarx-find-image (image)
  "Return image descriptor or glyph for IMAGE.
In Emacs, return an image descriptor for IMAGE.  In XEmacs,
return a glyph.

IMAGE is string.  Usually IMAGE neither contains a directory nor
an extension.  If the extension is omitted, `xpm', `xbm' and
`pbm' are tried.  If the directory is omitted,
`toolbarx-image-path' is searched."
  ;; `find-image' in Emacs 21 looks in `load-path' and `data-directory'.  In
  ;; Emacs 22, we have `image-load-path' which includes `load-path' and
  ;; `data-directory'.
  ;;
  ;; If there's some API in XEmacs to find the images, we should use it
  ;; instead of locate-library.
  ;;
  ;; Emacs 22 has locate-file, but the other Emacsen don't.  The
  ;; following should hopefully get us to all images ultimately.

  (let ((file))
    (dolist (i '("" ".xpm" ".xbm" ".pbm"))
      (unless file
	(setq file (locate-library (concat image i) t toolbarx-image-path))))
    (if (featurep 'xemacs)
	(and file (make-glyph file))
      (if file
	  (create-image file)
	(find-image `((:type xpm :file ,(concat image ".xpm"))
		      (:type xbm :file ,(concat image ".xbm"))
		      (:type pbm :file ,(concat image ".pbm"))))))))

;; next variable interfaces between parsing and display engines
(defvar toolbarx-internal-button-switches nil
  "Store the list of processed buttons, used by `toolbarx-refresh'.
This variable can store different values for the different buffers.")


;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;; Second engine: display parsed buttons in Emacs

(defun toolbarx-emacs-add-button (button used-keys keymap)
  "Insert a button where BUTTON is its description.
USED-KEYS should be a list of symbols, where the first element is
`:used-symbols'.  This list should store the symbols of the
buttons already inserted.  This list is changed by side effect.
KEYMAP is the keymap where the menu-item corresponding to the
tool-bal button is going to be inserted.  Insertion is made in
the end of KEYMAP.

BUTTON should be a list of form (SYMBOL . PROP-LIST).  SYMBOL is
a symbol that \"names\" this button.  PROP-LIST is a list in the
format (PROP VAL ... PROP VAL).	 The supported properties are
`:image', `:command', `:append-command', `:prepend-command',
`:help', `:enable', `:visible', `:button', `:insert' and
`:toolbar'. For a description of properties, see documentation of
function `toolbar-install-toolbar'."
  (let* ((symbol (nth 0 button))
	 (used-keys-list (when used-keys
			   (cdr used-keys)))
	 (filtered-props
	  (let* ((filtered-props-temp)
		 (prop-good-val)
		 (prop))
	    (dolist (p (nth 0 toolbarx-button-props) filtered-props-temp)
	      ;;    property	       -> (car p)
	      ;;    test type function -> (cadr p)
	      ;;    add-function       -> (cddr p)
	      (setq prop (memq (car p) button))
	      ;; if so, check if value is of correct type
	      (when prop
		;; if property is of add-type, them the value is a list
		;; (:add-value-list VAL VAL). Each VAL should be checked.
		(if (and (cddr p) (eq :add-value-list (car (cadr prop))))
		    (let* ((add-list (list (cddr p))))
		      (dolist (val (cdr (cadr prop)))
			(setq prop-good-val (funcall (cadr p) val))
			(when (car prop-good-val)
			  (setq add-list (cons (cdr prop-good-val) add-list))))
		      (setq add-list (nreverse add-list))
		      (when (eq 2 (length add-list)) ; just 1 value, no
						     ; add-function
			(setq add-list (cadr add-list)))
		      (setq filtered-props-temp (append
						 (list (car p) add-list)
						 filtered-props-temp)))
		  ;; if override-property
		  (setq prop-good-val (funcall (cadr p) (cadr prop)))
		  (when (car prop-good-val)
		    (setq filtered-props-temp (append
					       (list (car p)
						     (cdr prop-good-val))
					       filtered-props-temp))))))))
	 (insert (or (not (memq :insert filtered-props))
		     ;; (memq :insert filtered-props)
		     (eval (nth 1 (memq :insert filtered-props))))))
    (when insert
      (cond
       (t
	;; symbol is not :new-line, therefore a normal button
	(let* ((image (cadr (memq :image filtered-props)))
	       (image-descriptor
		(when (memq :image filtered-props)
		  (cond
		   ((stringp image) 	; string
		    (toolbarx-find-image image))
		   ((and (consp image)	; or image descriptor
			 (eq (car image) 'image))
		    image)
		   ((and (symbolp image) ; or a symbol bound to a
			 (boundp image)  ; image descriptor (defined
				       ; with `defimage')g
			 (consp (eval image))
			 (eq (car (eval image)) 'image))
		    (eval image))
		   (t			; otherwise, must be a list
					; with 4 strings or image
					; descriptors
		    (apply 'vector (mapcar (lambda (img)
					      (if (stringp img)
						  (toolbarx-find-image img)
						img))
					   image))))))
	       (command
		(let* ((com (nth 1 (memq :command filtered-props)))
		       (app (nth 1 (memq :append-command filtered-props)))
		       (prep (nth 1 (memq :prepend-command filtered-props))))
		  (when (or com app prep)
		    (toolbarx-make-command com prep app))))
	       (help (cons (memq :help filtered-props)
			   (cadr (memq :help filtered-props))))
	       (enable (cons (memq :enable filtered-props)
			     (cadr (memq :enable filtered-props))))
	       (visible (cons (memq :visible filtered-props)
			      (cadr (memq :visible filtered-props))))
	       (button (cons (memq :button filtered-props)
			     (cadr (memq :button filtered-props))))
	       (menuitem (append
			  (list 'menu-item
				(toolbarx-make-string-from-symbol symbol)
				command
				:image image-descriptor)
			  (when (car help)
			    (list :help (cdr help)))
			  (when (car enable)
			    (list :enable (cdr enable)))
			  (when (car visible)
			    (list :visible (cdr visible)))
			  (when (car button)
			    (list :button (cdr button)))))
	       (key-not-used
		(let* ((count 0)
		       (symb symbol))
		  (while (memq symb used-keys-list)
		    (setq count (1+ count))
		    (setq symb (intern (format "%s-%d" symbol count))))
		  symb)))
	  (when (and image-descriptor command)
	    (setq used-keys-list (cons key-not-used used-keys-list))
	    (define-key-after keymap
	      (vector key-not-used) menuitem))))))
    (when used-keys (setcdr used-keys used-keys-list))))


(defun toolbarx-emacs-refresh-process-button-or-insert-list (switches
							     used-keys
							     keymap)
  "Process SWITCHES, inserting buttons in `tool-bar-map'.
If a button is actually a `:insert' clause group (if `car' is
`:insert') and evaluation of `cdr' yields non-nil, process `cddr'
recursively as SWITCHES.  USED-KEYS is a list which `car' is
`:used-symbols' and which `cdr' is a list of symbols that have already
been used as keys in the keymap `tool-bar-map'."
  (dolist (button switches)
    (if (eq (car button) :insert)
	(when (eval (cadr button))
	  (toolbarx-emacs-refresh-process-button-or-insert-list (cddr button)
								used-keys
								keymap))
      (toolbarx-emacs-add-button button used-keys keymap))))



(defun toolbarx-emacs-refresh (&optional global-flag)
  "Refresh and redraw the toolbar in Emacs.
If GLOBAL-FLAG is non-nil, the default value of toolbar switches
is used and the default value of `toolbarx-map' is changed."
  (let* ((switches (if global-flag
		       (if (default-boundp 'toolbarx-internal-button-switches)
			   (default-value 'toolbarx-internal-button-switches)
			 toolbarx-internal-button-switches)
		     toolbarx-internal-button-switches))
	 (used-keys (list :used-symbols nil))
	 (tool-bar-map-temp (make-sparse-keymap)))
    (toolbarx-emacs-refresh-process-button-or-insert-list switches used-keys
							  tool-bar-map-temp)
    (if global-flag
	(setq-default tool-bar-map tool-bar-map-temp)
      (setq tool-bar-map tool-bar-map-temp))))


;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;; Third engine: display parsed buttons in XEmacs

(defun toolbarx-xemacs-image-properties (image)
  "Return a list of properties of IMAGE.
IMAGE should be a string or a list of one to six strings or
glyphs or nil, or a symbol bound to a list of one to six
glyphs (them must be a valid image list, like one created with
the function `toolbar-make-button-list').  Return a
list (GLYPH-LIST HEIGHT WIDTH) where HEIGHT (resp. WIDTH) is the
maximum of the heights (resp. widths) of all glyphs (or strings
converted to glyphs) in GLYPH-LIST.  If IMAGE is not a list, it
is treated as a list with IMAGE as only element.  Strings are
converted to glyphs with the function `toolbarx-find-image'.  If,
after possible string-to-glyph convertions, the list of glyphs
has nil as first element, GLYPH-LIST becomes nil."
  (let* ((glyph-list
	  (if (symbolp image)		; if symbol, them must be a
					; valid image list, like
					; created by function
					; `toolbar-make-button-list'
	      (eval image)
	    (let ((img-list (if (listp image)
				image
			      (list image)))
		  (glyph-list-temp))
	      ;; glyph-list-temp
	      (setq glyph-list-temp
		    (dolist (glyph img-list (nreverse glyph-list-temp))
		      (if (stringp glyph)
			  (setq glyph-list-temp
				(cons (toolbarx-find-image glyph)
				      glyph-list-temp))
			(setq glyph-list-temp (cons glyph glyph-list-temp)))))
	      (unless (car glyph-list-temp)
		(setq glyph-list-temp nil))
	      glyph-list-temp)))
	 (usable-buttons
	  ;; computing inheritage
	  (let* ((usable-temp))
	    (if toolbar-captioned-p	; problematic point :-(
		(progn
		  ;; CAP-UP:  cap-up -> up
		  (setq usable-temp (cons (cond
					   ((nth 3 glyph-list))
					   ((nth 0 glyph-list)))
					  usable-temp))
		  ;; CAP-DOWN:	cap-down -> cap-up -> down -> up
		  (setq usable-temp (cons (cond
					   ((nth 4 glyph-list))
					   ((nth 3 glyph-list))
					   ((nth 1 glyph-list))
					   ((nth 0 glyph-list)))
					  usable-temp))
		  ;; CAP-DISABLED:  cap-disabled -> cap-up -> disabled -> up
		  (setq usable-temp (cons (cond
					   ((nth 5 glyph-list))
					   ((nth 3 glyph-list))
					   ((nth 2 glyph-list))
					   ((nth 0 glyph-list)))
					  usable-temp)))
	      ;; UP:  up
	      (setq usable-temp (cons (nth 0 glyph-list) usable-temp))
	      ;; DOWN:	down -> up
	      (setq usable-temp (cons (cond
				       ((nth 1 glyph-list))
				       ((nth 0 glyph-list)))
				      usable-temp))
	      ;; DISABLED:  disabled -> up
	      (setq usable-temp (cons (cond
				       ((nth 2 glyph-list))
				       ((nth 0 glyph-list)))
				      usable-temp)))
	    usable-temp))
	 (height (apply 'max 0 (mapcar (lambda (glyph)
					 (if glyph
					     (glyph-height glyph)
					   0))
				       usable-buttons)))
	 (width (apply 'max 0 (mapcar (lambda (glyph)
					(if glyph
					    (glyph-width glyph)
					  0))
				      usable-buttons))))
    (list (if (symbolp image) image glyph-list) height width)))



(defun toolbarx-xemacs-button-properties (button)
  "Return a list of properties of BUTTON.
The result is either nil (if not to be inserted) or a list in the format
 (TOOLBAR HEIGHT WIDTH BUTTON-DESCRIPTION)
where

TOOLBAR is one of the symbols `default', `top', `right', `bottom'
  or `left'.

HEIGHT and WIDTH are the maximal dimentions of all the glyphs
  involved.

BUTTON-DESCRIPTION is button definition in XEmacs; see the
  documentation of variable `default-toolbar'."
  (let* ((filtered-props
	  (let* ((filtered-props-temp)
		 (prop-good-val)
		 (prop))
	    (dolist (p (nth 0 toolbarx-button-props) filtered-props-temp)
	      ;;    property	       -> (car p)
	      ;;    test type function -> (cadr p)
	      ;;    add-function       -> (cddr p)
	      (setq prop (memq (car p) button))
	      ;; if so, check if value is of correct type
	      (when prop
		;; if property is of add-type, them the value is a list
		;; (:add-value-list VAL VAL). Each VAL should be checked.
		(if (and (cddr p) (eq :add-value-list (car (cadr prop))))
		    (let* ((add-list (list (cddr p))))
		      (dolist (val (cdr (cadr prop)))
			(setq prop-good-val (funcall (cadr p) val))
			(when (car prop-good-val)
			  (setq add-list (cons (cdr prop-good-val) add-list))))
		      (setq add-list (nreverse add-list))
		      (when (eq 2 (length add-list)) ; just 1 value, no
						     ; add-function
			(setq add-list (cadr add-list)))
		      (setq filtered-props-temp (append
						 (list (car p) add-list)
						 filtered-props-temp)))
		  ;; if override-property
		  (setq prop-good-val (funcall (cadr p) (cadr prop)))
		  (when (car prop-good-val)
		    (setq filtered-props-temp (append
					       (list (car p)
						     (cdr prop-good-val))
					       filtered-props-temp))))))))
	 (insert (or (not (memq :insert filtered-props))
		     ;; (memq :insert filtered-props) holds
		     (eval (nth 1 (memq :insert filtered-props))))))
    (when insert
      (let* ((image-props (toolbarx-xemacs-image-properties
			   (cadr (memq :image filtered-props))))
	     (glyph-list (car image-props))
	     (image-height (nth 1 image-props))
	     (image-width (nth 2 image-props))
	     (command
	      (let* ((com (nth 1 (memq :command filtered-props)))
		     (app (nth 1 (memq :append-command filtered-props)))
		     (prep (nth 1 (memq :prepend-command filtered-props))))
		(when (or com app prep)
		  (toolbarx-make-command com prep app))))
	     ;; enable defaults to `t'
	     (enable (if (memq :enable filtered-props)
			 (cadr (memq :enable filtered-props))
		       t))
	    ;; help defaults to nil
	     (help (when (memq :help filtered-props)
		     (cadr (memq :help filtered-props))))
	     ;; toolbar defaults to `default'
	     (toolbar-prop (cons (memq :toolbar filtered-props)
				 (cadr (memq :toolbar filtered-props))))
	     (toolbar (if (car toolbar-prop)
			  (if (symbolp (cdr toolbar-prop))
			      (cdr toolbar-prop)
			    ;; (cdr toolbar-prop) is cons cell
			    (if (eq (cadr toolbar-prop)
					  (default-toolbar-position))
				      (cddr toolbar-prop)
				   (cadr toolbar-prop)))
			'default)))
	(when glyph-list
	  (list toolbar image-height image-width
		(vector glyph-list command enable help)))))))

(defun toolbarx-xemacs-refresh-process-button-or-insert-list (switches
							      toolbar-props)
  "Process SWITCHES, returning an updated version of TOOLBAR-PROPS.
TOOLBAR-PROPS should be a list with 12 elements, each one representing
properties (in this order) `locale', `default', `top', `right',
`bottom', `left', `default-height', `default-width', `top-height',
`right-width', `bottom-height' and `left-width'.  The return is a list
with the same properties updated.

NB: Buttons (vectors) are inserted in front of the lists
represented by `default', `top', `right', `bottom' and `left', so
the lists are built reversed."
  (let ((locale		 (nth 0	 toolbar-props))
	(default	 (nth 1	 toolbar-props))
	(top		 (nth 2	 toolbar-props))
	(right		 (nth 3	 toolbar-props))
	(bottom		 (nth 4	 toolbar-props))
	(left		 (nth 5	 toolbar-props))
	(default-height	 (nth 6	 toolbar-props))
	(default-width	 (nth 7	 toolbar-props))
	(top-height	 (nth 8	 toolbar-props))
	(right-width	 (nth 9	 toolbar-props))
	(bottom-height	 (nth 10 toolbar-props))
	(left-width	 (nth 11 toolbar-props))
	(toolbar-props-temp))
    (dolist (button switches)
      (if (eq (car button) :insert)
	  (when (eval (cadr button))
	    ;; if insert group, process `cddr'
	    (progn
	      (setq toolbar-props-temp
		    (toolbarx-xemacs-refresh-process-button-or-insert-list
		     (cddr button)
		     (list locale default top right bottom left
			   default-height default-width top-height
			   right-width bottom-height left-width)))
	      (setq default	   (nth 1  toolbar-props-temp))
	      (setq top		   (nth 2  toolbar-props-temp))
	      (setq right	   (nth 3  toolbar-props-temp))
	      (setq bottom	   (nth 4  toolbar-props-temp))
	      (setq left	   (nth 5  toolbar-props-temp))
	      (setq default-height (nth 6  toolbar-props-temp))
	      (setq default-width  (nth 7  toolbar-props-temp))
	      (setq top-height	   (nth 8  toolbar-props-temp))
	      (setq right-width	   (nth 9  toolbar-props-temp))
	      (setq bottom-height  (nth 10 toolbar-props-temp))
	      (setq left-width	   (nth 11 toolbar-props-temp))))
	;; else, if normal button
	(let* ((button-props (toolbarx-xemacs-button-properties button))
	       (toolbar (nth 0 button-props))
	       (height (nth 1 button-props))
	       (width (nth 2 button-props))
	       (button-description (nth 3 button-props)))
	  (when button-props
	    (cond
	     ;; default
	     ((eq toolbar 'default)
	      (setq default (cons button-description default))
	      (setq default-height (max default-height height))
	      (setq default-width (max default-width width)))
	     ;; top
	     ((eq toolbar 'top)
	      (setq top (cons button-description top))
	      (setq top-height (max top-height height)))
	     ;; right
	     ((eq toolbar 'right)
	      (setq right (cons button-description right))
	      (setq right-width (max right-width width)))
	     ;; bottom
	     ((eq toolbar 'bottom)
	      (setq bottom (cons button-description bottom))
	      (setq bottom-height (max bottom-height height)))
	     ;; left
	     ((eq toolbar 'left)
	      (setq left (cons button-description left))
	      (setq left-width (max left-width width))))))))
    ;; return a list similar to toolbar-props
    (list locale default top right bottom left default-height
	  default-width top-height right-width bottom-height left-width)))


(defun toolbarx-xemacs-refresh (&optional global-flag)
  "Refresh the toolbar in XEmacs."
  (let* ((switches (if global-flag
		       (if (default-boundp 'toolbarx-internal-button-switches)
			   (default-value 'toolbarx-internal-button-switches)
			 toolbarx-internal-button-switches)
		     toolbarx-internal-button-switches))
	 (locale  (if global-flag 'global (current-buffer)))
	 (toolbar-init (list locale	; locale
			     nil	; default
			     nil	; top
			     nil	; right
			     nil	; bottom
			     nil	; left
			     0		; default-height
			     0		; default-width
			     0		; top-height
			     0		; right-width
			     0		; bottom-height
			     0))	; left-width
	 (toolbar-props
	  (toolbarx-xemacs-refresh-process-button-or-insert-list switches
								 toolbar-init))
	 ;; NB: Buttons (vectors) are inserted in front of the lists
	 ;; represented by `default', `top', `right', `bottom' and
	 ;; `left', so the lists are built reversed.
	 (default	  (nreverse (nth 1  toolbar-props)))
	 (top		  (nreverse (nth 2  toolbar-props)))
	 (right		  (nreverse (nth 3  toolbar-props)))
	 (bottom	  (nreverse (nth 4  toolbar-props)))
	 (left		  (nreverse (nth 5  toolbar-props)))
	 (default-height  (nth 6  toolbar-props))
	 (default-width	  (nth 7  toolbar-props))
	 (top-height	  (nth 8  toolbar-props))
	 (right-width	  (nth 9  toolbar-props))
	 (bottom-height	  (nth 10 toolbar-props))
	 (left-width	  (nth 11 toolbar-props))
	 (button-raised-border 2)
	 (default-border (specifier-instance default-toolbar-border-width))
	 (top-border (specifier-instance top-toolbar-border-width))
	 (right-border (specifier-instance right-toolbar-border-width))
	 (bottom-border (specifier-instance bottom-toolbar-border-width))
	 (left-border (specifier-instance left-toolbar-border-width)))
    ;; adding borders
    (when default
      (setq default-height (+ (* 2 button-raised-border)
			      (* 2 default-border)
			      default-height))
      (setq default-width (+ (* 2 button-raised-border)
			     (* 2 default-border)
			     default-width)))
    (when top
      (setq top-height (+ (* 2 button-raised-border)
			  (* 2 top-border)
			  top-height)))
    (when right
      (setq right-width (+ (* 2 button-raised-border)
			   (* 2 right-border)
			   right-width)))
    (when bottom
      (setq bottom-height (+ (* 2 button-raised-border)
			     (* 2 bottom-border)
			     bottom-height)))
    (when left
      (setq left-width (+ (* 2 button-raised-border)
			  (* 2 left-border)
			  left-width)))
    ;; deal with specifiers
    ;; - remove all specifiers for toolbars witout buttons
    (if default
	(progn
	  (if (memq (default-toolbar-position) '(top bottom))
	      (set-specifier default-toolbar-visible-p
			     (not (not default)) locale)
	    (set-specifier default-toolbar-visible-p
			   (not (not default)) locale))
	  (if (memq (default-toolbar-position) '(top bottom))
	      (set-specifier default-toolbar-height default-height locale)
	    (set-specifier default-toolbar-width default-width locale))
	  (set-specifier default-toolbar default locale))
      (remove-specifier default-toolbar locale)
      (remove-specifier default-toolbar-visible-p locale)
      (remove-specifier default-toolbar-height locale)
      (remove-specifier default-toolbar-width locale))
    (if top
	(progn
	  (set-specifier top-toolbar-visible-p (not (not top)) locale)
	  (set-specifier top-toolbar-height top-height locale)
	  (set-specifier top-toolbar top locale))
      (remove-specifier top-toolbar locale)
      (remove-specifier top-toolbar-visible-p locale)
      (remove-specifier top-toolbar-height locale))
    (if right
	(progn
	  (set-specifier right-toolbar-visible-p (not (not right))
			 locale)
	  (set-specifier right-toolbar-width right-width locale)
	  (set-specifier right-toolbar right locale))
      (remove-specifier right-toolbar locale)
      (remove-specifier right-toolbar-visible-p locale)
      (remove-specifier right-toolbar-width locale))
    (if bottom
	(progn
	  (set-specifier bottom-toolbar-visible-p (not (not bottom)) locale)
	  (set-specifier bottom-toolbar-height bottom-height locale)
	  (set-specifier bottom-toolbar bottom locale))
      (remove-specifier bottom-toolbar locale)
      (remove-specifier bottom-toolbar-visible-p locale)
      (remove-specifier bottom-toolbar-height locale))
    (if left
	(progn
	  (set-specifier left-toolbar-visible-p (not (not left)) locale)
	  (set-specifier left-toolbar-width left-width locale)
	  (set-specifier left-toolbar left locale))
      (remove-specifier left-toolbar locale)
      (remove-specifier left-toolbar-visible-p locale)
      (remove-specifier left-toolbar-width locale))))


;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;; finishing parsing engine

(defun toolbarx-refresh (&optional global-flag)
  "Redraw the toolbar, peviously installed with `toolbarx'.
Force global refresh if GLOBAL-FLAG is non-nil."
  (interactive "P")
  (if (featurep 'xemacs)
      (toolbarx-xemacs-refresh global-flag)
    (toolbarx-emacs-refresh global-flag)))

;;;###autoload (autoload 'toolbarx-install-toolbar "toolbar-x")

(defun toolbarx-install-toolbar (buttons &optional meaning-alist global-flag)
  "Install toolbar buttons given in BUTTONS.
Button properties are optionally given in MEANING-ALIST.  If
GLOBAL-FLAG is non-nil, toolbar is installed globally (on every
buffer that does not have a toolbar set locally).  BUTTONS is a
list of format
  (ELEM ... ELEM . PROPS),
where each ELEM is either

 - a list in the same format od BUTTONS, which is going to be
   refered as a *group*; groups are used to distribute properties
   recursively to its elements; there are groups with special
   format for special purpose: *dropdown groups* and also *eval
   groups*.

 - a symbol, which could be associated in MEANING-ALIST with a
   list of button properties (symbol + properties = a *button*)
   or associated to a special kind of group (an *alias group*).

 - a vector, which elements are on the previous formats (but not
   another vector); this is useful to specify different
   ingredients to the toolbar depending if editor is Emacs or
   XEmacs; the first element will be used in Emacs; the second
   element is going to be used in XEmacs.

Meaning alist
=============

MEANING-ALIST is a list where each element is in one of the
formats (SYMB . BUTTON-PROPS-LIST) or (SYMB .  ALIAS-GROUP).
BUTTON-PROPS-LIST is a list in one of the formats
  (IMAGE COMMAND PROP VAL PROP VAL ... PROP VAL)  or
  (PROP VAL PROP VAL ... PROP VAL).
The IMAGE is going to be used as the `:image' property of the
button (see button properties bellow), and COMMAND shall be used
as the `:command' property of the button.  Each PROP is one of
the button properties, and VAL is its respective value.
ALIAS-GROUP is a list which first element is the symbol `:alias'
and the cdr shall be processed as a group.

However, a symbol is not required to have an association in
MEANING-ALIST, which is only a way to specify properties to a
button.	 One can use groups to specify properties.  Nil is a good
MEANING-ALIST.

Buttons
=======

A toolbar button in `toolbarx' is the set with a symbol and
properties used to display the button, like a image and a command
to call when the button is pressed (which are the minimal
elements that a button should have.)  The supported properties
for buttons and their `basic types' (see note on how values of
properties are obtained!) are:

 :image -- in Emacs, either a string or image descriptor (see
   info for a definition), or a variable bound to a image
   descriptor (like those defined with `defimage') or a list of 4
   strings or image descriptors; in XEmacs, either a string or a
   glyph, or a symbol bount to a glyph, or a list of at least 1
   and at most 6 strings or glyphs or nil (not the first element
   though); defines the image file displayed by the button.  If
   it is a string, the image file found with that name (always
   using the function `toolbarx-find-image' to make the
   \`internal\' image descriptor) is used as button image.  For
   the other formats, the button image is handled in the same way
   as it is treated by the editors; see info nodes bellow for a
   description of the capabilities of each editor
      Emacs: info file \"elisp\", node \"Tool Bar\" (see `:image'
             property);
             PS: a *vector* of four strings is used in the Emacs
             Lisp documentation as the `more ellaborated' image
             property format, but here we reserve vectors to
             provide editor-dependent values; this motivates our
             choice for a list instead of vector (however,
             internally the list becomes a vector when displaying
             the button).
     XEmacs: info file \"lispref\", node \"Toolbar Descriptor
             Format\" (see GLYPH-LIST) or the documentation of
             the variable `default-toolbar'; check the inheritage
             in case of a ommited glyph or nil instead of glyph.

 :command -- a form; if the form happens to be a command, it will
   be called with `call-interactively'.

 :append-command -- a form added to the end of the value of
   `:command'.

 :prepend-command -- a form added at the beginning of the value
   of `:command'.

 :help -- either a string or nil; defined the help string of the
   button;

 :enable -- a form, evaluated constantly by both editors to
   determine if a button is active (enabled) or not.

 :visible -- in Emacs, a form that is evaluated constantly to
   determine if a button is visible; in XEmacs, this property is
   ignored.

 :button -- in Emacs, a cons cell (TYPE .  SELECTED) where the
   TYPE should be `:toggle' or `:radio' and the cdr should be a
   form.  SELECTED is evaluated to determine when the button is
   selected.  This property is ignored in XEmacs.

 :insert -- a form that is evaluated every time that the toolbar
   is refresh (a call of `toolbarx-refresh') to determine if the
   button is inserted or just ignored (until next refresh).

 :toolbar -- in XEmacs, either one of the symbols `default',
   `top', `bottom', `left', `right', or a cons cell
   (POS . POS-AVOID-DEFAULT) where POS and POS-AVOID-DEFAULT
   should be one of the symbols `top', `bottom', `left', `right';
   if a symbol, the button will be inserted in one of these
   toolbars; if a cons cell, button will be inserted in toolbar
   POS unless the position of the default toolbar is POS (then,
   the default toolbar would override the position-specific
   toolbar), and in this case, button will be inserted in toolbar
   POS-AVOID-DEFAULT; in Emacs, this property is meaningless, and
   therefore ignored.  Hint of use of this property: in a
   program, use or everything with `default' and the cons format
   to avoid the default toolbar, or use only the position
   specific buttons (symbols that are not `default'), because of
   the `overriding' system in XEmacs, when a position-specific
   toolbar overrides the default toolbar; for instance, if you
   put a button in the default toolbar and another in the top
   toolbar (and the default toolbar is in the top), then *only*
   the ones in the top toolbar will be visible!

How to specify a button
=======================

One can specify a button by its symbol or by a group to specify
properties.  For example,
  BUTTON =
    ( foo
      (bar :image [\"bar-Emacs\" \"bar-XEmacs\"]
           :command bar-function :help \"Bar help string\")
      :insert foo-bar )
  MEANING-ALIST = ( (foo :image \"foo\" :command foo-function) )
specifiy two buttons `foo' and `bar', each one with its necessary
:image and :command properties, and both use the :insert property
specified ate the end of BUTTONS (because groups distribute
properties to all its elements).  `foo' and `bar' will be
inserted only if `foo-bar' evaluation yields non-nil.  `bar' used
a different :image property depending if editor is Emacs or
XEmacs.

Note on how values of properties are obtained
=============================================

For each property PROP, its value should be either:
   i) a vector of 2 elements; then each element should be of the
      basic type of PROP.
  ii) an element on the basic type of PROP.
 iii) a function (that does not need arguments); it is evaluated
      and the return should be ot type i) or ii) above
  iv) a symbol bound to a element of type i) or ii).

The type is cheched in the order i), ii) iii) and iv).	This
evaluations are done every time that the oolbar is refresh.

Ps.: in order to specify a vector as value of a property (like
the :image in Emacs), it is necessary to provide the vector as
element of another vector.

Special groups
==============

Eval groups
-----------

If the first element of a group is the symbol `:eval-group', each
element is evaluated (with `eval'), put inside a list and
processed like a group.	 Eval groups are useful to store
definition of buttons in a variable.

Dropdown groups
---------------

The idea is to specify a set of buttons that appear when a
determined menu item of a dropdown menu is active.  The dropdown
menu appears when a button (by default with a triangle pointing
down) is clicked.  This button is called `dropdown button'.  The
dropdown button appears on the left of the currently visible
buttons of the dropdown group.

A dropdown group is a list which first element is the symbol
`:dropdown-group' and in one of the following formats
  (:dropdown-group SYMBOL-1 ... SYMBOL-n  PROP-1 VAL-1 ... PROP-k VAL-k)
or
  (:dropdown-group
     STRING-1 ITEM-11 ... ITEM-1n
     STRING-2 ITEM-21 ... ITEM-2m
	   . . .
     STRING-n ITEM-n1 ... ITEM-np
       PROP-1 VAL-1 ... PROP-j VAL-j)
where
 SYMBOL-* is a symbol that defines a button in MEANING-ALIST;
 STRING-* is a string that will appear in the dropdown menu;
 ITEM-* is any format that define buttons or groups.

\(a dropdown group of first format is internally converted to the
second by making strings from the symbols and each symbol is the
item)

The same rules for obtaining property values, described above,
apply here.  Properties are also distributed by groups.	 The
supported properties and their basic type are:

 :type -- one of the symbols `radio' (default) or `toggle'; if
   type is radio, only one of the itens may be active, and if
   type is toggle, any item number of itens can be active.

 :variable -- a symbol; it is the variable that govern the
   dropdown button; every time the value should be an integer
   starting from 1 (if type is radio) or a list of integers (if
   type is toggle).  The Nth set of buttons is :insert'ed.

 :default -- determines the default value when the menu is
   installed; it is ignored if a value was saved with custom; it
   defaults to 1 if type is radio or nil if type is toggle.  If
   value is a integer and type is `toggle', value used is a list
   with that integer.

 :save -- one of the symbols nil (default), `offer' or
   `always'; determined if it is possible for the user to save
   the which menu itens are active, for a next session.	 If value
   is `offer', a item (offering to save) is added to the
   popup menu.	If the value is `always', every time that a item
   is selected, the variable is saved.	If value is nil, variable
   shall not be saved.	If value is non-nil then `:variable' is
   mandatory.

 :title -- a string or nil; if a string, the popup menu will show
   is as menu title; if nil, no title is shown.

 :dropdown-help -- a string or nil; the help string of the
   dropdown button.

 :dropdown-image -- in Emacs, either a string or a vector of 4
   strings; in XEmacs, either a string or a glyph or a list of at
   least 1 and at most 6 strings or glyphs; defines the image
   file displayed by the dropdown button; by default, it is the
   string \"dropdown\".

 :dropdown-append-command,
 :dropdownprepend-command -- a form; append or prepend forms to
   the command that shows the dropdown menu, allowing extra code
   to run before or after the menu appears (remember that every
   menu item clicked refresh the toolbar.)

 :dropdown-enable -- a form; evaluated constantly by both editors
   to determine if the dropdown button is active (enabled) or
   not.

 :dropdown-visible -- a form; in Emacs, it is evaluated
   constantly to determine if the dropdown button is visible; in
   XEmacs, this property is ignored.

 :dropdown-toolbar -- in XEmacs, one of the symbols `default',
   `opposite', `top', `bottom', `left' or `right'; ignored in
   Emacs; in XEmacs, the toolbar where the dropdown button will
   appear.

Also, if the symbol `dropdown' is associted in MEANING-ALIST
with some properties, these properties override (or add) with
higher precedence.

Special buttons
===============

If the symbol of a button is `:new-line', it is inserted
a (faked) return, and the next button will be displayed a next
line of buttons.  The only property supported for this button is
`:insert'.  This feature is available only in Emacs.  In XEmacs,
this button is ignored."
  (let ((switches (toolbarx-process-group buttons meaning-alist nil nil)))
    (if global-flag
	(setq-default toolbarx-internal-button-switches
		      switches)
      (set (make-local-variable 'toolbarx-internal-button-switches)
	   switches)
      (unless (featurep 'xemacs)
	(make-local-variable 'tool-bar-map))))
  (toolbarx-refresh global-flag))


(defconst toolbarx-default-toolbar-meaning-alist
  '((separator :image "sep" :command t :enable nil :help "")
    (open-file :image ["new" toolbar-file-icon]
	       :command [find-file toolbar-open]
	       :enable [(not (window-minibuffer-p
			      (frame-selected-window menu-updating-frame)))
			t]
	       :help ["Read a file into an Emacs buffer" "Open a file"])

    (dired :image ["open" toolbar-folder-icon]
	   :command [dired toolbar-dired]
	   :help ["Read a directory, operate on its files" "Edit a directory"])

    (save-buffer :image ["save" toolbar-disk-icon]
		 :command [save-buffer toolbar-save]
		 :enable [(and
			   (buffer-modified-p)
			   (buffer-file-name)
			   (not (window-minibuffer-p
				 (frame-selected-window menu-updating-frame))))
			  t]
		 :help ["Save current buffer to its file"  "Save buffer"]
		 :visible (or buffer-file-name
			      (not (eq 'special