path: root/lisp/international/fontset.el

;;; fontset.el --- Commands for handling fontset.

;; Copyright (C) 1995, 1997 Electrotechnical Laboratory, JAPAN.
;; Licensed to the Free Software Foundation.

;; Keywords: mule, multilingual, fontset

;; 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:

;; Set standard REGISTRY property of charset to find an appropriate
;; font for each charset.  This is used to generate a font name in a
;; fontset.  If the value contains a character `-', the string before
;; that is embeded in `CHARSET_REGISTRY' field, and the string after
;; that is embeded in `CHARSET_ENCODING' field.  If the value does not
;; contain `-', the whole string is embeded in `CHARSET_REGISTRY'
;; field, and a wild card character `*' is embeded in
;; `CHARSET_ENCODING' field.

(defvar x-charset-registries
  '((ascii . "ISO8859-1")
    (latin-iso8859-1 . "ISO8859-1")
    (latin-iso8859-2 . "ISO8859-2")
    (latin-iso8859-3 . "ISO8859-3")
    (latin-iso8859-4 . "ISO8859-4")
    (thai-tis620 . "TIS620")
    (greek-iso8859-7 . "ISO8859-7")
    (arabic-iso8859-6 . "ISO8859-6")
    (hebrew-iso8859-8 . "ISO8859-8")
    (katakana-jisx0201 . "JISX0201")
    (latin-jisx0201 . "JISX0201")
    (cyrillic-iso8859-5 . "ISO8859-5")
    (latin-iso8859-9 . "ISO8859-9")
    (japanese-jisx0208-1978 . "JISX0208.1978")
    (chinese-gb2312 . "GB2312")
    (japanese-jisx0208 . "JISX0208.1983")
    (korean-ksc5601 . "KSC5601")
    (japanese-jisx0212 . "JISX0212")
    (chinese-cns11643-1 . "CNS11643.1992-1")
    (chinese-cns11643-2 . "CNS11643.1992-2")
    (chinese-cns11643-3 . "CNS11643.1992-3")
    (chinese-cns11643-4 . "CNS11643.1992-4")
    (chinese-cns11643-5 . "CNS11643.1992-5")
    (chinese-cns11643-6 . "CNS11643.1992-6")
    (chinese-cns11643-7 . "CNS11643.1992-7")
    (chinese-big5-1 . "Big5")
    (chinese-big5-2 . "Big5")
    (chinese-sisheng . "sisheng_cwnn")
    (vietnamese-viscii-lower . "VISCII1.1")
    (vietnamese-viscii-upper . "VISCII1.1")
    (arabic-digit . "MuleArabic-0")
    (arabic-1-column . "MuleArabic-1")
    (arabic-2-column . "MuleArabic-2")
    (ipa . "MuleIPA")
    (ethiopic . "Ethiopic-Unicode")
    (ascii-right-to-left . "ISO8859-1")
    (indian-is13194 . "IS13194-Devanagari")
    (indian-2-column . "MuleIndian-2")
    (indian-1-column . "MuleIndian-1")
    (lao . "MuleLao-1")
    (tibetan . "MuleTibetan-0")
    (tibetan-1-column . "MuleTibetan-1")
    ))

(let ((l x-charset-registries))
  (while l
    (condition-case nil
	(put-charset-property (car (car l)) 'x-charset-registry (cdr (car l)))
      (error nil))
    (setq l (cdr l))))

;; Set arguments in `font-encoding-alist' (which see).
(defun set-font-encoding (pattern charset encoding)
  (let ((slot (assoc pattern font-encoding-alist)))
    (if slot
	(let ((place (assq charset (cdr slot))))
	  (if place
	      (setcdr place encoding)
	    (setcdr slot (cons (cons charset encoding) (cdr slot)))))
      (setq font-encoding-alist
	    (cons (list pattern (cons charset encoding)) font-encoding-alist)))
    ))

(set-font-encoding "ISO8859-1" 'ascii 0)
(set-font-encoding "JISX0201" 'latin-jisx0201 0)

;; Setting for suppressing XLoadQueryFont on big fonts.
(setq x-pixel-size-width-font-regexp
      "gb2312\\|jisx0208\\|ksc5601\\|cns11643\\|big5")

(defvar x-font-name-charset-alist
  '(("iso8859-1" ascii latin-iso8859-1)
    ("iso8859-2" ascii latin-iso8859-2)
    ("iso8859-3" ascii latin-iso8859-3)
    ("iso8859-4" ascii latin-iso8859-4)
    ("iso8859-5" ascii cyrillic-iso8859-5)
    ("iso8859-6" ascii arabic-iso8859-6)
    ("iso8859-7" ascii greek-iso8859-7)
    ("iso8859-8" ascii hebrew-iso8859-8)
    ("tis620" ascii thai-tis620)
    ("koi8" ascii cyrillic-iso8859-5)
    ("viscii" ascii vietnamese-viscii-upper vietnamese-viscii-lower)
    ("vscii" ascii vietnamese-viscii-upper vietnamese-viscii-lower)
    ("mulelao-1" ascii lao))
  "Alist of font names vs list of charsets the font can display.

When a font name which matches some element of this alist is given as
`-fn' command line argument or is specified by X resource, a fontset
which uses the specified font for the corresponding charsets are
created and used for the initial frame.")

;;; XLFD (X Logical Font Description) format handler.

;; Define XLFD's field index numbers.		; field name
(defconst xlfd-regexp-foundry-subnum 0)		; FOUNDRY
(defconst xlfd-regexp-family-subnum 1)		; FAMILY_NAME
(defconst xlfd-regexp-weight-subnum 2)		; WEIGHT_NAME
(defconst xlfd-regexp-slant-subnum 3)		; SLANT
(defconst xlfd-regexp-swidth-subnum 4)		; SETWIDTH_NAME
(defconst xlfd-regexp-adstyle-subnum 5)		; ADD_STYLE_NAME
(defconst xlfd-regexp-pixelsize-subnum 6)	; PIXEL_SIZE
(defconst xlfd-regexp-pointsize-subnum 7)	; POINT_SIZE
(defconst xlfd-regexp-resx-subnum 8)		; RESOLUTION_X
(defconst xlfd-regexp-resy-subnum 9)		; RESOLUTION_Y
(defconst xlfd-regexp-spacing-subnum 10)	; SPACING
(defconst xlfd-regexp-avgwidth-subnum 11)	; AVERAGE_WIDTH
(defconst xlfd-regexp-registry-subnum 12)	; CHARSET_REGISTRY
(defconst xlfd-regexp-encoding-subnum 13)	; CHARSET_ENCODING

;; Regular expression matching against a fontname which conforms to
;; XLFD (X Logical Font Description).  All fields in XLFD should be
;; not be omitted (but can be a wild card) to be matched.
(defconst xlfd-tight-regexp
  "^\
-\\([^-]*\\)-\\([^-]*\\)-\\([^-]*\\)-\\([^-]*\\)-\\([^-]*\\)\
-\\([^-]*\\)-\\([^-]*\\)-\\([^-]*\\)-\\([^-]*\\)-\\([^-]*\\)\
-\\([^-]*\\)-\\([^-]*\\)-\\([^-]*\\)-\\([^-]*\\)$")

;; List of field numbers of XLFD whose values are numeric.
(defconst xlfd-regexp-numeric-subnums
  (list xlfd-regexp-pixelsize-subnum	;6
	xlfd-regexp-pointsize-subnum	;7
	xlfd-regexp-resx-subnum		;8
	xlfd-regexp-resy-subnum		;9
	xlfd-regexp-avgwidth-subnum	;11
	))

(defun x-decompose-font-name (pattern)
  "Decompose PATTERN into XLFD's fields and return vector of the fields.
The length of the vector is 14.

If PATTERN doesn't conform to XLFD, try to get a full XLFD name from
X server and use the information of the full name to decompose
PATTERN.  If no full XLFD name is gotten, return nil."
  (let (xlfd-fields fontname)
    (if (string-match xlfd-tight-regexp pattern)
	(let ((i 0))
	  (setq xlfd-fields (make-vector 14 nil))
	  (while (< i 14)
	    (aset xlfd-fields i (match-string (1+ i) pattern))
	    (setq i (1+ i)))
	  xlfd-fields)
      (setq fontname (condition-case nil
			 (x-resolve-font-name pattern)
		       (error)))
      (if (and fontname
	       (string-match xlfd-tight-regexp fontname))
	  (let ((len (length pattern))
		(i 0)
		l)
	    (setq xlfd-fields (make-vector 14 nil))
	    (while (< i 14)
	      (aset xlfd-fields i
		    (cons (match-beginning (1+ i))
			  (match-string (1+ i) fontname)))
	      (setq i (1+ i)))
	    (setq i 0)
	    (while (< i len)
	      (let ((ch (aref pattern i)))
		(if (= ch ??)
		    (setq pattern (concat (substring pattern 0 i)
					  "\\(.\\)"
					  (substring pattern (1+ i)))
			  len (+ len 4)
			  i (+ i 4))
		  (if (= ch ?*)
		      (setq pattern (concat (substring pattern 0 i)
					    "\\(.*\\)"
					    (substring pattern (1+ i)))
			    len (+ len 5)
			    i (+ i 5))
		    (setq i (1+ i))))))
	    (string-match pattern fontname)
	    (setq l (cdr (cdr (match-data))))
	    (setq i 0)
	    (while (< i 14)
	      (if (or (null l) (< (car (aref xlfd-fields i)) (car l)))
		  (progn
		    (aset xlfd-fields i (cdr (aref xlfd-fields i)))
		    (setq i (1+ i)))
		(if (< (car (aref xlfd-fields i)) (car (cdr l)))
		    (progn
		      (aset xlfd-fields i "*")
		      (setq i (1+ i)))
		  (setq l (cdr (cdr l))))))
	    xlfd-fields)))))

;; Replace consecutive wild-cards (`*') in NAME to one.
;; Ex. (x-reduce-font-name "-*-*-*-iso8859-1") => "-*-iso8859-1"
(defsubst x-reduce-font-name (name)
  (while (string-match "-\\*-\\(\\*-\\)+" name)
    (setq name (replace-match "-*-" t t name)))
  name)

(defun x-compose-font-name (xlfd-fields &optional reduce)
  "Compose X's fontname from FIELDS.
FIELDS is a vector of XLFD fields.
If a field is nil, wild-card letter `*' is embedded.
Optional argument REDUCE non-nil means consecutive wild-cards are
reduced to be one."
  (let ((name
	 (concat "-" (mapconcat (lambda (x) (or x "*")) xlfd-fields "-"))))
    (if reduce
	(x-reduce-font-name name)
      name)))

(defun register-alternate-fontnames (fontname)
  "Register alternate fontnames for FONTNAME in `alternate-fontname-alist'.
When Emacs fails to open FONTNAME, it tries to open an alternate font
registered in the variable `alternate-fontname-alist' (which see).

For FONTNAME, the following three alternate fontnames are registered:
  fontname which ignores style specification of FONTNAME,
  fontname which ignores size specification of FONTNAME,
  fontname which ignores both style and size specification of FONTNAME.
Emacs tries to open fonts in this order."
  (unless (assoc fontname alternate-fontname-alist)
    (let ((xlfd-fields (x-decompose-font-name fontname))
	  style-ignored size-ignored both-ignored)
      (when xlfd-fields
	(aset xlfd-fields xlfd-regexp-foundry-subnum nil)
	(aset xlfd-fields xlfd-regexp-family-subnum nil)

	(let ((temp (copy-sequence xlfd-fields)))
	  (aset temp xlfd-regexp-weight-subnum nil)
	  (aset temp xlfd-regexp-slant-subnum nil)
	  (aset temp xlfd-regexp-swidth-subnum nil)
	  (aset temp xlfd-regexp-adstyle-subnum nil)
	  (setq style-ignored (x-compose-font-name temp t)))

	(aset xlfd-fields xlfd-regexp-pixelsize-subnum nil)
	(aset xlfd-fields xlfd-regexp-pointsize-subnum nil)
	(aset xlfd-fields xlfd-regexp-resx-subnum nil)
	(aset xlfd-fields xlfd-regexp-resy-subnum nil)
	(aset xlfd-fields xlfd-regexp-spacing-subnum nil)
	(aset xlfd-fields xlfd-regexp-avgwidth-subnum nil)
	(setq size-ignored (x-compose-font-name xlfd-fields t))

	(aset xlfd-fields xlfd-regexp-weight-subnum nil)
	(aset xlfd-fields xlfd-regexp-slant-subnum nil)
	(aset xlfd-fields xlfd-regexp-swidth-subnum nil)
	(aset xlfd-fields xlfd-regexp-adstyle-subnum nil)
	(setq both-ignored (x-compose-font-name xlfd-fields t))

	(setq alternate-fontname-alist
	      (cons (list fontname style-ignored size-ignored both-ignored)
		    alternate-fontname-alist))))))

(defun x-complement-fontset-spec (xlfd-fields fontlist)
  "Complement FONTLIST for all charsets based on XLFD-FIELDS and return it.
XLFD-FIELDS is a vector of XLFD (X Logical Font Description) fields.
FONTLIST is an alist of charsets vs the corresponding font names.

Font names for charsets not listed in FONTLIST are generated from
XLFD-FIELDS and a property of x-charset-registry of each charset
automatically."
  (let ((charsets charset-list))
    (while charsets
      (let ((charset (car charsets)))
	(unless (assq charset fontlist)
	  (let ((registry (get-charset-property charset
						'x-charset-registry))
		registry-val encoding-val fontname)
	    (if (string-match "-" registry)
		;; REGISTRY contains `CHARSET_ENCODING' field.
		(setq registry-val (substring registry 0 (match-beginning 0))
		      encoding-val (substring registry (match-end 0)))
	      (setq registry-val (concat registry "*")
		    encoding-val "*"))
	    (aset xlfd-fields xlfd-regexp-registry-subnum registry-val)
	    (aset xlfd-fields xlfd-regexp-encoding-subnum encoding-val)
	    (setq fontname (downcase (x-compose-font-name xlfd-fields)))
	    (setq fontlist (cons (cons charset fontname) fontlist))
	    (register-alternate-fontnames fontname))))
      (setq charsets (cdr charsets))))

  ;; If the font for ASCII can also be used for another charsets, use
  ;; that font instead of what generated based on x-charset-registery
  ;; in the previous code.
  (let ((ascii-font (cdr (assq 'ascii fontlist)))
	(l x-font-name-charset-alist))
    (while l
      (if (string-match (car (car l)) ascii-font)
	  (let ((charsets (cdr (car l))))
	    (while charsets
	      (if (not (eq (car charsets) 'ascii))
		  (setcdr (assq (car charsets) fontlist) ascii-font))
	      (setq charsets (cdr charsets)))
	    (setq l nil))
	(setq l (cdr l)))))

  fontlist)

(defun fontset-name-p (fontset)
  "Return non-nil if FONTSET is valid as fontset name.
A valid fontset name should conform to XLFD (X Logical Font Description)
with \"fontset\" in `<CHARSET_REGISTRY> field."
  (and (string-match xlfd-tight-regexp fontset)
       (string= (match-string (1+ xlfd-regexp-registry-subnum) fontset)
		"fontset")))

;; Return a list to be appended to `x-fixed-font-alist' when
;; `mouse-set-font' is called.
(defun generate-fontset-menu ()
  (let ((fontsets global-fontset-alist)
	fontset-name
	l)
    (while fontsets
      (setq fontset-name (car (car fontsets)) fontsets (cdr fontsets))
      (setq l (cons (list (fontset-plain-name fontset-name) fontset-name) l)))
    (cons "Fontset" l)))

(defun fontset-plain-name (fontset)
  "Return a plain and descriptive name of FONTSET."
  (if (not (setq fontset (query-fontset fontset)))
      (error "Invalid fontset: %s" fontset))
  (let ((xlfd-fields (x-decompose-font-name fontset)))
    (if xlfd-fields
	(let ((weight (aref xlfd-fields xlfd-regexp-weight-subnum))
	      (slant  (aref xlfd-fields xlfd-regexp-slant-subnum))
	      (swidth (aref xlfd-fields xlfd-regexp-swidth-subnum))
	      (size   (aref xlfd-fields xlfd-regexp-pixelsize-subnum))
	      (charset (aref xlfd-fields xlfd-regexp-registry-subnum))
	      (nickname (aref xlfd-fields xlfd-regexp-encoding-subnum))
	      name)
	  (if (not (string= "fontset" charset))
	      fontset
	    (if (> (string-to-int size) 0)
		(setq name (format "%s: %s-dot" nickname size))
	      (setq name nickname))
	    (cond ((string-match "^medium$" weight)
		   (setq name (concat name " " "medium")))
		  ((string-match "^bold$\\|^demibold$" weight)
		   (setq name (concat name " " weight))))
	    (cond ((string-match "^i$" slant)
		   (setq name (concat name " " "italic")))
		  ((string-match "^o$" slant)
		   (setq name (concat name " " "slant")))
		  ((string-match "^ri$" slant)
		   (setq name (concat name " " "reverse italic")))
		  ((string-match "^ro$" slant)
		   (setq name (concat name " " "reverse slant"))))
	    name))
      fontset)))

(defvar uninstantiated-fontset-alist nil
  "Alist of fontset names vs. information for instantiating them.
Each element has the form (FONTSET STYLE FONTLIST), where
FONTSET is a name of fontset not yet instantiated.
STYLE is a style of FONTSET, one of the followings:
  bold, demobold, italic, oblique,
  bold-italic, demibold-italic, bold-oblique, demibold-oblique.
FONTLIST is an alist of charsets vs font names to be used in FONSET.")

(defconst x-style-funcs-alist
  '((bold x-make-font-bold)
    (demibold x-make-font-demibold)
    (italic x-make-font-italic)
    (oblique x-make-font-oblique)
    (bold-italic x-make-font-bold x-make-font-italic)
    (demibold-italic x-make-font-demibold x-make-font-italic)
    (demibold-oblique x-make-font-demibold x-make-font-oblique)
    (bold-oblique x-make-font-bold x-make-font-oblique))
  "Alist of font style vs functions to generate a X font name of the style.")

;;;###autoload
(defun create-fontset-from-fontset-spec (fontset-spec
					 &optional style-variant-p noerror)
  "Create a fontset from fontset specification string FONTSET-SPEC.
FONTSET-SPEC is a string of the format:
	FONTSET-NAME,CHARSET-NAME0:FONT-NAME0,CHARSET-NAME1:FONT-NAME1, ...
Any number of SPACE, TAB, and NEWLINE can be put before and after commas.
If optional argument STYLE-VARIANT-P is specified, it also creates
fontsets which differs from FONTSET-NAME in styles (e.g. bold, italic).
If this function attempts to create already existing fontset, error is
signaled unless the optional 3rd argument NOERROR is non-nil."
  (if (not (string-match "^[^,]+" fontset-spec))
      (error "Invalid fontset spec: %s" fontset-spec))
  (let ((idx (match-end 0))
	(name (match-string 0 fontset-spec))
	fontlist charset)
    (if (query-fontset name)
	(or noerror 
	    (error "Fontset \"%s\" already exists"))
      ;; At first, extract pairs of charset and fontname from FONTSET-SPEC.
      (while (string-match "[, \t\n]*\\([^:]+\\):\\([^,]+\\)" fontset-spec idx)
	(setq idx (match-end 0))
	(setq charset (intern (match-string 1 fontset-spec)))
	(if (charsetp charset)
	    (setq fontlist (cons (cons charset (match-string 2 fontset-spec))
				 fontlist))))

      (if style-variant-p
	  ;; Generate fontset names of style variants and set them in
	  ;; uninstantiated-fontset-alist.
	  (let ((style-funcs-alist x-style-funcs-alist)
		new-name style funcs)
	    (while style-funcs-alist
	      (setq style (car (car style-funcs-alist))
		    funcs (cdr (car style-funcs-alist)))
	      (setq new-name name)
	      (while funcs
		(setq new-name (funcall (car funcs) new-name))
		(setq funcs (cdr funcs)))
	      (setq uninstantiated-fontset-alist
		    (cons (list new-name style fontlist)
			  uninstantiated-fontset-alist))
	      (setq style-funcs-alist (cdr style-funcs-alist)))))

      ;; If NAME conforms to XLFD, complement FONTLIST for charsets
      ;; which are not specified in FONTSET-SPEC.
      (let ((xlfd-fields (x-decompose-font-name name)))
	(if xlfd-fields
	    (setq fontlist
		  (x-complement-fontset-spec xlfd-fields fontlist))))
      
      ;; Create the fontset.
      (new-fontset name fontlist)

      ;; Define the alias (short name) if appropriate.
      (if (and (not (assoc name fontset-alias-alist))
	       (string-match "fontset-.*$" name))
	  (let ((alias (match-string 0 name)))
	    (or (rassoc alias fontset-alias-alist)
		(setq fontset-alias-alist
		      (cons (cons name alias) fontset-alias-alist))))))))

(defun instantiate-fontset (fontset)
  "Make FONTSET be readly to use.
FONTSET should be in the variable `uninstantiated-fontset-alist' in advance.
Return FONTSET if it is created successfully, else return nil."
  (let ((fontset-data (assoc fontset uninstantiated-fontset-alist)))
    (if (null fontset-data)
	nil
      (let* ((xlfd-fields (x-decompose-font-name fontset))
	     (fontlist (x-complement-fontset-spec xlfd-fields
						  (nth 2 fontset-data)))
	     (funcs (cdr (assq (nth 1 fontset-data) x-style-funcs-alist)))
	     ascii-font font font2)
	(setq uninstantiated-fontset-alist
	      (delete fontset-data uninstantiated-fontset-alist))
	(setq fontlist (x-complement-fontset-spec xlfd-fields fontlist))

	;; At first, check if ASCII font of this style is surely available.
	(setq ascii-font (cdr (assq 'ascii fontlist)))
	(if (= (length funcs) 1)
	    (and (setq font (funcall (car funcs) ascii-font))
		 (setq font (x-resolve-font-name font 'default)))
	  (and (setq font (funcall (car funcs) ascii-font))
	       (not (equal font ascii-font))
	       (setq font2 (funcall (nth 1 funcs) font))
	       (not (equal font2 font))
	       (setq font (x-resolve-font-name font2 'default))))

	;; If ASCII font is available, instantiate the fontset.
	(when font
	  (let ((new-fontlist (list (cons 'ascii font))))
	    (while fontlist
	      (setq font (cdr (car fontlist)))
	      (or (eq (car (car fontlist)) 'ascii)
		  (if (if (= (length funcs) 1)
			  (setq font (funcall (car funcs) font))
			(and (setq font (funcall (car funcs) font))
			     (not (equal font (cdr (car fontlist))))
			     (setq font2 (funcall (nth 1 funcs) font))
			     (not (equal font2 font))
			     (setq font font2)))
		      (setq new-fontlist
			    (cons (cons (car fontlist) font) new-fontlist))))
	      (setq fontlist (cdr fontlist)))
	    (new-fontset fontset (x-complement-fontset-spec xlfd-fields
							    fontlist))
	    fontset))))))

;; Create standard fontset from 16 dots fonts which are the most widely
;; installed fonts.  Fonts for Chinese-GB, Korean, and Chinese-CNS are
;; specified here because FAMILY of those fonts are not "fixed" in
;; many cases.
(defvar standard-fontset-spec
  "-*-fixed-medium-r-normal-*-16-*-*-*-*-*-fontset-standard,
	chinese-gb2312:-*-medium-r-normal-*-16-*-gb2312*-*,
	korean-ksc5601:-*-medium-r-normal-*-16-*-ksc5601*-*,
	chinese-cns11643-1:-*-medium-r-normal-*-16-*-cns11643*-1,
	chinese-cns11643-2:-*-medium-r-normal-*-16-*-cns11643*-2,
	chinese-cns11643-3:-*-medium-r-normal-*-16-*-cns11643*-3,
	chinese-cns11643-4:-*-medium-r-normal-*-16-*-cns11643*-4,
	chinese-cns11643-5:-*-medium-r-normal-*-16-*-cns11643*-5,
	chinese-cns11643-6:-*-medium-r-normal-*-16-*-cns11643*-6,
	chinese-cns11643-7:-*-medium-r-normal-*-16-*-cns11643*-7"
  "String of fontset spec of the standard fontset.
You have the biggest chance to display international characters
with correct glyphs by using the standard fontset.
See the documentation of `create-fontset-from-fontset-spec' for the format.")

;; Create fontsets from X resources of the name `fontset-N (class
;; Fontset-N)' where N is integer 0, 1, ...
;; The values of the resources the string of the same format as
;; `standard-fontset-spec'.

(defun create-fontset-from-x-resource ()
  (let ((idx 0)
	fontset-spec)
    (while (setq fontset-spec (x-get-resource (concat "fontset-" idx)
					      (concat "Fontset-" idx)))
      (create-fontset-from-fontset-spec fontset-spec nil 'noerror)
      (setq idx (1+ idx)))))

(defsubst fontset-list ()
  "Returns a list of all defined fontset names."
  (mapcar 'car global-fontset-alist))

;;
(provide 'fontset)

;;; fontset.el ends here