--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/lisp/x-font-menu.el	Mon Aug 13 10:04:58 2007 +0200
@@ -0,0 +1,564 @@
+;; x-font-menu.el --- Managing menus of X fonts.
+
+;; Copyright (C) 1994 Free Software Foundation, Inc.
+;; Copyright (C) 1995 Tinker Systems and INS Engineering Corp.
+;; Copyright (C) 1997 Sun Microsystems
+
+;; Author: Jamie Zawinski <jwz@netscape.com>
+;; Restructured by: Jonathan Stigelman <Stig@hackvan.com>
+;; Mule-ized by: Martin Buchholz
+
+;; This file is part of XEmacs.
+
+;; XEmacs 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.
+
+;; XEmacs 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 XEmacs; see the file COPYING.  If not, write to the 
+;; Free Software Foundation, 59 Temple Place - Suite 330,
+;; Boston, MA 02111-1307, USA.
+
+;;; Commentary:
+;;;
+;;; Creates three menus, "Font", "Size", and "Weight", and puts them on the
+;;; "Options" menu.  The contents of these menus are the superset of those
+;;; properties available on any fonts, but only the intersection of the three
+;;; sets is selectable at one time.
+;;;
+;;; Known Problems:
+;;; ===============
+;;; Items on the Font menu are selectable if and only if that font exists in
+;;; the same size and weight as the current font.  This means that some fonts
+;;; are simply not reachable from some other fonts - if only one font comes
+;;; in only one point size (like "Nil", which comes only in 2), you will never
+;;; be able to select it.  It would be better if the items on the Fonts menu
+;;; were always selectable, and selecting them would set the size to be the
+;;; closest size to the current font's size.
+;;;
+;;; This attempts to change all other faces in an analagous way to the change
+;;; that was made to the default face; if it can't, it will skip over the face.
+;;; However, this could leave incongruous font sizes around, which may cause
+;;; some nonreversibility problems if further changes are made.  Perhaps it
+;;; should remember the initial fonts of all faces, and derive all subsequent
+;;; fonts from that initial state.
+;;;
+;;; xfontsel(1) is a lot more flexible (but probably harder to understand).
+;;;
+;;; The code to construct menus from all of the x11 fonts available from the
+;;; server is autoloaded and executed the very first time that one of the Font
+;;; menus is selected on each device.  That is, if XEmacs has frames on two
+;;; different devices, then separate font menu information will be maintained
+;;; for each X display.  If the font path changes after emacs has already
+;;; asked the X server on a particular display for its list of fonts, this
+;;; won't notice.  Also, the first time that a font menu is posted on each
+;;; display will entail a lengthy delay, but that's better than slowing down
+;;; XEmacs startup.  At any time (i.e.: after a font-path change or
+;;; immediately after device creation), you can call
+;;; `reset-device-font-menus' to rebuild the menus from all currently
+;;; available fonts.
+;;;
+;;; There is knowledge here about the regexp match numbers in
+;;; `x-font-regexp' and `x-font-regexp-foundry-and-family' defined in
+;;; x-faces.el.
+;;;
+;;; There are at least three kinds of fonts under X11r5:
+;;;
+;;; - bitmap fonts, which can be assumed to look as good as possible;
+;;; - bitmap fonts which have been (or can be) automatically scaled to
+;;;   a new size, and which almost always look awful;
+;;; - and true outline fonts, which should look ok at any size, but in
+;;;   practice (on at least some systems) look awful at any size, and
+;;;   even in theory are unlikely ever to look as good as non-scaled
+;;;   bitmap fonts.
+;;;
+;;; It would be nice to get this code to look for non-scaled bitmap fonts
+;;; first, then outline fonts, then scaled bitmap fonts as a last resort.
+;;; But it's not clear to me how to tell them apart based on their truenames
+;;; and/or the result of XListFonts().  I welcome any and all explanations
+;;; of the subtleties involved...
+;;;
+;;;
+;;; If You Think You'Re Seeing A Bug:
+;;; =================================
+;;; When reporting problems, send the following information:
+;;;
+;;; - Exactly what behavior you're seeing;
+;;; - The output of the `xlsfonts' program;
+;;; - The value of the variable `device-fonts-cache';
+;;; - The values of the following expressions, both before and after
+;;;   making a selection from any of the fonts-related menus:
+;;;	(face-font 'default)
+;;;	(font-truename   (face-font 'default))
+;;;	(font-properties (face-font 'default))
+;;; - The values of the following variables after making a selection:
+;;;	font-menu-preferred-resolution
+;;;	font-menu-registry-encoding
+;;;
+;;; There is a common misconception that "*-courier-medium-r-*-11-*", also
+;;; known as "-adobe-courier-medium-r-normal--11-80-100-100-m-60-iso8859-1",
+;;; is an 11-point font.  It is not -- it is an 11-pixel font at 100dpi,
+;;; which is an 8-point font (the number after -11- is the size in tenths
+;;; of points).  So if you expect to be seeing an "11" entry in the "Size"
+;;; menu and are not, this may be why.
+;;;
+;;; In the real world (aka Solaris), one has to deal with fonts that
+;;; appear to be medium-i but are really light-r, and fonts that
+;;; resolve to different resolutions depending on the charset:
+;;;
+;;; (font-instance-truename
+;;;  (make-font-instance "-*-mincho-medium-i-normal-*-*-*-*-*-*-*-jisx0201*-*"))
+;;; ==>
+;;; "-morisawa-ryumin light kl-light-r-normal--10-100-72-72-m-50-jisx0201.1976-0"
+;;;
+;;; (list-fonts "-dt-interface user-medium-r-normal-s*-*-*-*-*-*-*-*-*")
+;;; ==>
+;;; ("-dt-interface user-medium-r-normal-s sans-12-120-72-72-m-70-iso8859-1"
+;;;  "-dt-interface user-medium-r-normal-s-14-120-75-75-m-120-jisx0208.1983-0"
+;;;  "-dt-interface user-medium-r-normal-s-14-120-75-75-m-60-jisx0201.1976-0")
+
+;;; Code:
+
+;; #### - implement these...
+;;
+;;; (defvar font-menu-ignore-proportional-fonts nil
+;;;   "*If non-nil, then the font menu will only show fixed-width fonts.")
+
+;;;###autoload
+(defcustom font-menu-ignore-scaled-fonts t
+  "*If non-nil, then the font menu will try to show only bitmap fonts."
+  :type 'boolean
+  :group 'x)
+
+;;;###autoload
+(defcustom font-menu-this-frame-only-p nil
+  "*If non-nil, then changing the default font from the font menu will only
+affect one frame instead of all frames."
+  :type 'boolean
+  :group 'x)
+
+;; only call XListFonts (and parse) once per device.
+;; ( (device . [parsed-list-fonts family-menu size-menu weight-menu]) ...)
+(defvar device-fonts-cache nil)
+
+(defvar font-menu-registry-encoding nil
+  "Registry and encoding to use with font menu fonts.")
+
+(defvar font-menu-preferred-resolution "*-*"
+  "Preferred horizontal and vertical font menu resolution (e.g. \"75-75\").")
+
+(defvar fonts-menu-junk-families
+  (purecopy
+   (mapconcat
+    #'identity
+    '("cursor" "glyph" "symbol"	; Obvious losers.
+      "\\`Ax...\\'"		; FrameMaker fonts - there are just way too
+				;  many of these, and there is a different
+				;  font family for each font face!  Losers.
+				;  "Axcor" -> "Applix Courier Roman",
+				;  "Axcob" -> "Applix Courier Bold", etc.
+      )
+    "\\|"))
+  "A regexp matching font families which are uninteresting (e.g. cursor fonts).")
+
+(eval-when-compile
+  (defsubst device-fonts-cache ()
+    (or (cdr (assq (selected-device) device-fonts-cache))
+	(reset-device-font-menus (selected-device)))))
+
+(defun hack-font-truename (fn)
+  "Filter the output of `font-instance-truename' to deal with Japanese fontsets."
+  (if (string-match "," (font-instance-truename fn))
+      (let ((fpnt (nth 8 (split-string (font-instance-name fn) "-")))
+	    (flist (split-string (font-instance-truename fn) ","))
+	    ret)
+	(while flist
+	  (if (string-equal fpnt (nth 8 (split-string (car flist) "-")))
+	      (progn (setq ret (car flist)) (setq flist nil))
+	    (setq flist (cdr flist))
+	    ))
+	ret)
+    (font-instance-truename fn)))
+
+;;;###autoload
+(fset 'install-font-menus 'reset-device-font-menus)
+(make-obsolete 'install-font-menus 'reset-device-font-menus)
+
+(defvar x-font-regexp-ascii nil
+  "This is used to filter out font families that can't display ASCII text.
+It must be set at run-time.")
+
+(defun vassoc (key valist)
+  "Search VALIST for a vector whose first element is equal to KEY.
+See also `assoc'."
+  ;; by Stig@hackvan.com
+  (let (el)
+    (catch 'done
+      (while (setq el (pop valist))
+	(and (equal key (aref el 0))
+	     (throw 'done el))))))
+
+;;;###autoload
+(defun reset-device-font-menus (&optional device debug)
+  "Generates the `Font', `Size', and `Weight' submenus for the Options menu.
+This is run the first time that a font-menu is needed for each device.
+If you don't like the lazy invocation of this function, you can add it to
+`create-device-hook' and that will make the font menus respond more quickly
+when they are selected for the first time.  If you add fonts to your system, 
+or if you change your font path, you can call this to re-initialize the menus."
+  ;; by Stig@hackvan.com
+  ;; #### - this should implement a `menus-only' option, which would
+  ;; recalculate the menus from the cache w/o having to do list-fonts again.
+  (message "Getting list of fonts from server... ")
+  (if (or noninteractive
+	  (not (or device (setq device (selected-device))))
+	  (not (eq (device-type device) 'x)))
+      nil
+    (unless x-font-regexp-ascii
+      (setq x-font-regexp-ascii (if (featurep 'mule)
+				    (charset-registry 'ascii)
+				  "iso8859-1")))
+    (setq font-menu-registry-encoding
+	  (if (featurep 'mule) "*-*" "iso8859-1"))
+    (let ((case-fold-search t)
+	  family size weight entry monospaced-p
+	  dev-cache cache families sizes weights)
+      (dolist (name (cond ((null debug)	; debugging kludge
+			   (list-fonts "*-*-*-*-*-*-*-*-*-*-*-*-*-*" device))
+			  ((stringp debug) (split-string debug "\n"))
+			  (t debug)))
+	(when (and (string-match x-font-regexp-ascii name)
+		   (string-match x-font-regexp name))
+	  (setq weight (capitalize (match-string 1 name))
+		size   (string-to-int (match-string 6 name)))
+	  (or (string-match x-font-regexp-foundry-and-family name)
+	      (error "internal error"))
+	  (setq family (capitalize (match-string 1 name)))
+	  (or (string-match x-font-regexp-spacing name)
+	      (error "internal error"))
+	  (setq monospaced-p (string= "m" (match-string 1 name)))
+	  (unless (string-match fonts-menu-junk-families family)
+	    (setq entry (or (vassoc family cache)
+			    (car (setq cache
+				       (cons (vector family nil nil t)
+					     cache)))))
+	    (or (member family families) (push family families))
+	    (or (member weight weights)  (push weight weights))
+	    (or (member size   sizes)    (push size   sizes))
+	    (or (member weight (aref entry 1)) (push weight (aref entry 1)))
+	    (or (member size   (aref entry 2)) (push size   (aref entry 2)))
+	    (aset entry 3 (and (aref entry 3) monospaced-p)))))
+      ;;
+      ;; Hack scalable fonts.
+      ;; Some fonts come only in scalable versions (the only size is 0)
+      ;; and some fonts come in both scalable and non-scalable versions
+      ;; (one size is 0).  If there are any scalable fonts at all, make
+      ;; sure that the union of all point sizes contains at least some
+      ;; common sizes - it's possible that some sensible sizes might end
+      ;; up not getting mentioned explicitly.
+      ;;
+      (if (member 0 sizes)
+	  (let ((common '(60 80 100 120 140 160 180 240)))
+	    (while common
+	      (or;;(member (car common) sizes)   ; not enough slack
+	       (let ((rest sizes)
+		     (done nil))
+		 (while (and (not done) rest)
+		   (if (and (> (car common) (- (car rest) 5))
+			    (< (car common) (+ (car rest) 5)))
+		       (setq done t))
+		   (setq rest (cdr rest)))
+		 done)
+	       (setq sizes (cons (car common) sizes)))
+	      (setq common (cdr common)))
+	    (setq sizes (delq 0 sizes))))
+
+      (setq families (sort families 'string-lessp)
+	    weights  (sort weights 'string-lessp)
+	    sizes    (sort sizes '<))
+
+      (dolist (entry cache)
+	  (aset entry 1 (sort (aref entry 1) 'string-lessp))
+	  (aset entry 2 (sort (aref entry 2) '<)))
+
+      (message "Getting list of fonts from server... done.")
+
+      (setq dev-cache (assq device device-fonts-cache))
+      (or dev-cache
+	  (setq dev-cache (car (push (list device) device-fonts-cache))))
+      (setcdr
+       dev-cache
+       (vector
+	cache
+	(mapcar (lambda (x)
+		  (vector x
+			  (list 'font-menu-set-font x nil nil)
+			  ':style 'radio ':active nil ':selected nil))
+		families)
+	(mapcar (lambda (x)
+		  (vector (if (/= 0 (% x 10))
+			      ;; works with no LISP_FLOAT_TYPE
+			      (concat (int-to-string (/ x 10)) "."
+				      (int-to-string (% x 10)))
+			    (int-to-string (/ x 10)))
+			  (list 'font-menu-set-font nil nil x)
+			  ':style 'radio ':active nil ':selected nil))
+		sizes)
+	(mapcar (lambda (x)
+		  (vector x
+			  (list 'font-menu-set-font nil x nil)
+			  ':style 'radio ':active nil ':selected nil))
+		weights)))
+      (cdr dev-cache))))
+
+;; Extract font information from a face.  We examine both the
+;; user-specified font name and the canonical (`true') font name.
+;; These can appear to have totally different properties.
+;; For examples, see the prolog above.
+
+;; We use the user-specified one if possible, else use the truename.
+;; If the user didn't specify one (with "-dt-*-*", for example)
+;; get the truename and use the possibly suboptimal data from that.
+(defun* font-menu-font-data (face dcache)
+  (let* ((case-fold-search t)
+	 (domain (if font-menu-this-frame-only-p
+				  (selected-frame)
+				(selected-device)))
+	 (name (font-instance-name (face-font-instance face domain)))
+	 (truename (font-instance-truename
+		    (face-font-instance face domain
+					(if (featurep 'mule) 'ascii))))
+	 family size weight entry slant)
+    (when (string-match x-font-regexp-foundry-and-family name)
+      (setq family (capitalize (match-string 1 name)))
+      (setq entry (vassoc family (aref dcache 0))))
+    (when (and (null entry)
+	       (string-match x-font-regexp-foundry-and-family truename))
+      (setq family (capitalize (match-string 1 truename)))
+      (setq entry  (vassoc family (aref dcache 0))))
+    (when (null entry)
+      (return-from font-menu-font-data (make-vector 5 nil)))
+    
+    (when (string-match x-font-regexp name)
+      (setq weight (capitalize    (match-string 1 name)))
+      (setq size   (string-to-int (match-string 6 name))))
+      
+    (when (string-match x-font-regexp truename)
+      (when (not (member weight (aref entry 1)))
+	(setq weight (capitalize (match-string 1 truename))))
+      (when (not (member size   (aref entry 2)))
+	(setq size (string-to-int (match-string 6 truename))))
+      (setq slant (capitalize (match-string 2 truename))))
+      
+    (vector entry family size weight slant)))
+
+;;;###autoload
+(defun font-menu-family-constructor (ignored)
+  (catch 'menu
+    (unless (eq 'x (device-type (selected-device)))
+      (throw 'menu '(["Cannot parse current font" ding nil])))
+    (let* ((dcache (device-fonts-cache))
+	   (font-data (font-menu-font-data 'default dcache))
+	   (entry  (aref font-data 0))
+	   (family (aref font-data 1))
+	   (size   (aref font-data 2))
+	   (weight (aref font-data 3))
+	   f)
+      (unless family
+	(throw 'menu '(["Cannot parse current font" ding nil])))
+      ;; Items on the Font menu are enabled iff that font exists in
+      ;; the same size and weight as the current font (scalable fonts
+      ;; exist in every size).  Only the current font is marked as
+      ;; selected.
+      (mapcar
+       (lambda (item)
+	 (setq f (aref item 0)
+	       entry (vassoc f (aref dcache 0)))
+	 (if (and (member weight (aref entry 1))
+		  (or (member size (aref entry 2))
+		      (and (not font-menu-ignore-scaled-fonts)
+			   (member 0 (aref entry 2)))))
+	     (enable-menu-item item)
+	   (disable-menu-item item))
+	 (if (string-equal family f)
+	     (select-toggle-menu-item item)
+	   (deselect-toggle-menu-item item))
+	 item)
+       (aref dcache 1)))))
+
+;;;###autoload
+(defun font-menu-size-constructor (ignored)
+  (catch 'menu
+    (unless (eq 'x (device-type (selected-device)))
+      (throw 'menu '(["Cannot parse current font" ding nil])))
+    (let* ((dcache (device-fonts-cache))
+	   (font-data (font-menu-font-data 'default dcache))
+	   (entry  (aref font-data 0))
+	   (family (aref font-data 1))
+	   (size   (aref font-data 2))
+	   ;;(weight (aref font-data 3))
+	   s)
+      (unless family
+	(throw 'menu '(["Cannot parse current font" ding nil])))
+      ;; Items on the Size menu are enabled iff current font has
+      ;; that size.  Only the size of the current font is selected.
+      ;; (If the current font comes in size 0, it is scalable, and
+      ;; thus has every size.)
+      (mapcar
+       (lambda (item)
+	 (setq s (nth 3 (aref item 1)))
+	 (if (or (member s (aref entry 2))
+		 (and (not font-menu-ignore-scaled-fonts)
+		      (member 0 (aref entry 2))))
+	     (enable-menu-item item)
+	   (disable-menu-item item))
+	 (if (eq size s)
+	     (select-toggle-menu-item item)
+	   (deselect-toggle-menu-item item))
+	 item)
+       (aref dcache 2)))))
+
+;;;###autoload
+(defun font-menu-weight-constructor (ignored)
+  (catch 'menu
+    (unless (eq 'x (device-type (selected-device)))
+      (throw 'menu '(["Cannot parse current font" ding nil])))
+    (let* ((dcache (device-fonts-cache))
+	   (font-data (font-menu-font-data 'default dcache))
+	   (entry  (aref font-data 0))
+	   (family (aref font-data 1))
+	   ;;(size   (aref font-data 2))
+	   (weight (aref font-data 3))
+	   w)
+      (unless family
+	(throw 'menu '(["Cannot parse current font" ding nil])))
+      ;; Items on the Weight menu are enabled iff current font
+      ;; has that weight.  Only the weight of the current font
+      ;; is selected.
+      (mapcar
+       (lambda (item)
+	 (setq w (aref item 0))
+	 (if (member w (aref entry 1))
+	     (enable-menu-item item)
+	   (disable-menu-item item))
+	 (if (string-equal weight w)
+	     (select-toggle-menu-item item)
+	   (deselect-toggle-menu-item item))
+	 item)
+       (aref dcache 3)))))
+
+
+;;; Changing font sizes
+
+(defun font-menu-set-font (family weight size)
+  ;; This is what gets run when an item is selected from any of the three
+  ;; fonts menus.  It needs to be rather clever.
+  ;; (size is measured in 10ths of points.)
+  (let* ((dcache (device-fonts-cache))
+	 (font-data (font-menu-font-data 'default dcache))
+	 (from-family (aref font-data 1))
+	 (from-size   (aref font-data 2))
+	 (from-weight (aref font-data 3))
+	 (from-slant  (aref font-data 4))
+	 new-default-face-font)
+    (unless from-family
+      (signal 'error '("couldn't parse font name for default face")))
+    (setq new-default-face-font
+	  (font-menu-load-font (or family from-family)
+			       (or weight from-weight)
+			       (or size   from-size)
+			       from-slant
+			       font-menu-preferred-resolution))
+    (dolist (face (delq 'default (face-list)))
+      (when (face-font-instance face)
+	(message "Changing font of `%s'..." face)
+	(condition-case c
+	    (font-menu-change-face face
+				   from-family from-weight from-size
+				   family      weight      size)
+	  (error
+	   (display-error c nil)
+	   (sit-for 1)))))
+    ;; Set the default face's font after hacking the other faces, so that
+    ;; the frame size doesn't change until we are all done.
+
+    ;;; WMP - we need to honor font-menu-this-frame-only-p here!
+    (set-face-font 'default new-default-face-font
+		   (and font-menu-this-frame-only-p (selected-frame)))
+    (message "Font %s" (face-font-name 'default))))
+
+
+(defun font-menu-change-face (face
+			      from-family from-weight from-size
+			      to-family   to-weight   to-size)
+  (or (symbolp face) (signal 'wrong-type-argument (list 'symbolp face)))
+  (let* ((dcache (device-fonts-cache))
+	 (font-data (font-menu-font-data face dcache))
+	 (face-family (aref font-data 1))
+	 (face-size   (aref font-data 2))
+	 (face-weight (aref font-data 3))
+	 (face-slant  (aref font-data 4)))
+
+    (or face-family
+	(signal 'error (list "couldn't parse font name for face" face)))
+
+    ;; If this face matches the old default face in the attribute we
+    ;; are changing, then change it to the new attribute along that
+    ;; dimension.  Also, the face must have its own global attribute.
+    ;; If its value is inherited, we don't touch it.  If any of this
+    ;; is not true, we leave it alone.
+    (when (and (face-font face 'global)
+	       (cond 
+		(to-family (string-equal face-family from-family))
+		(to-weight (string-equal face-weight from-weight))
+		(to-size   (=            face-size   from-size))))
+      (set-face-font face
+		     (font-menu-load-font (or to-family face-family)
+					  (or to-weight face-weight)
+					  (or to-size   face-size)
+					  face-slant
+					  font-menu-preferred-resolution)
+		     (and font-menu-this-frame-only-p
+			  (selected-frame))))))
+
+(defun font-menu-load-font (family weight size slant resolution)
+  "Try to load a font with the requested properties.
+The weight, slant and resolution are only hints."
+  (when (integerp size) (setq size (int-to-string size)))
+  (let (font)
+    (catch 'got-font
+      (dolist (weight (list weight "*"))
+	(dolist (slant
+		 (cond ((string-equal slant "O") '("O" "I" "*"))
+		       ((string-equal slant "I") '("I" "O" "*"))
+		       ((string-equal slant "*") '("*"))
+		       (t (list slant "*"))))
+	  (dolist (resolution
+		   (if (string-equal resolution "*-*")
+		       (list resolution)
+		     (list resolution "*-*")))
+	    (when (setq font
+			(make-font-instance
+			 (concat  "-*-" family "-" weight "-" slant "-*-*-*-"
+				  size "-" resolution "-*-*-"
+				  font-menu-registry-encoding)
+			 nil t))
+	      (throw 'got-font font))))))))
+
+(defun flush-device-fonts-cache (device)
+  ;; by Stig@hackvan.com
+  (let ((elt (assq device device-fonts-cache)))
+    (and elt
+	 (setq device-fonts-cache (delq elt device-fonts-cache)))))
+
+(add-hook 'delete-device-hook 'flush-device-fonts-cache)
+
+(provide 'x-font-menu)
+
+;;; x-font-menu.el ends here