;;; mule-diag.el --- Show diagnosis of multilingual environment (MULE)

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

;; Keywords: multilingual, charset, coding system, fontset, diagnosis

;; 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.

;;; General utility function

;; Print all arguments with single space separator in one line.
(defun print-list (&rest args)
  (while (cdr args)
    (when (car args)
      (princ (car args))
      (princ " "))
    (setq args (cdr args)))
  (princ (car args))
  (princ "\n"))

;; Re-order the elements of charset-list.
(defun sort-charset-list ()
  (setq charset-list
	(sort charset-list
	      (function (lambda (x y) (< (charset-id x) (charset-id y)))))))

;;; CHARSET

;;;###autoload
(defun list-character-sets (&optional arg)
  "Display a list of all character sets.

The ID column contains a charset identification number for internal use.
The B column contains a number of bytes occupied in a buffer.
The W column contains a number of columns occupied in a screen.

With prefix arg, the output format gets more cryptic
but contains full information about each character sets."
  (interactive "P")
  (sort-charset-list)
  (with-output-to-temp-buffer "*Help*"
    (save-excursion
      (set-buffer standard-output)
      (let ((l charset-list)
	    charset)
	(if (null arg)
	    (progn
	      (insert "ID  Name		    B W Description\n")
	      (insert "--  ----		    - - -----------\n")
	      (while l
		(setq charset (car l) l (cdr l))
		(insert (format "%03d %s" (charset-id charset) charset))
		(indent-to 28)
		(insert (format "%d %d %s\n"
				(charset-bytes charset)
				(charset-width charset)
				(charset-description charset)))))
	  (insert "\
#########################
## LIST OF CHARSETS
## Each line corresponds to one charset.
## The following attributes are listed in this order
## separated by a colon `:' in one line.
##	CHARSET-ID,
##	CHARSET-SYMBOL-NAME,
##	DIMENSION (1 or 2)
##	CHARS (94 or 96)
##	BYTES (of multibyte form: 1, 2, 3, or 4),
##	WIDTH (occupied column numbers: 1 or 2),
##	DIRECTION (0:left-to-right, 1:right-to-left),
##	ISO-FINAL-CHAR (character code of ISO-2022's final character)
##	ISO-GRAPHIC-PLANE (ISO-2022's graphic plane, 0:GL, 1:GR)
##	DESCRIPTION (describing string of the charset)
")
	  (while l
	    (setq charset (car l) l (cdr l))
	    (princ (format "%03d:%s:%d:%d:%d:%d:%d:%d:%d:%s\n" 
			   (charset-id charset)
			   charset
			   (charset-dimension charset)
			   (charset-chars charset)
			   (charset-bytes charset)
			   (charset-width charset)
			   (charset-direction charset)
			   (charset-iso-final-char charset)
			   (charset-iso-graphic-plane charset)
			   (charset-description charset))))))
      (help-mode)
      (setq truncate-lines t))))

;;; CODING-SYSTEM

;; Print information of designation of each graphic register in FLAGS
;; in human readable format.  See the documentation of
;; `make-coding-system' for the meaning of FLAGS.
(defun print-designation (flags)
  (let ((graphic-register 0)
	charset)
    (while (< graphic-register 4)
      (setq charset (aref flags graphic-register))
      (princ (format
	      "  G%d -- %s\n"
	      graphic-register
	      (cond ((null charset)
		     "never used")
		    ((eq charset t)
		     "no initial designation, and used by any charsets")
		    ((symbolp charset)
		     (format "%s:%s"
			     charset (charset-description charset)))
		    ((listp charset)
		     (if (charsetp (car charset))
			 (format "%s:%s, and also used by the followings:"
				 (car charset)
				 (charset-description (car charset)))
		       "no initial designation, and used by the followings:"))
		    (t
		     "invalid designation information"))))
      (when (listp charset)
	(setq charset (cdr charset))
	(while charset
	  (cond ((eq (car charset) t)
		 (princ "\tany other charsets\n"))
		((charsetp (car charset))
		 (princ (format "\t%s:%s\n"
				(car charset)
				(charset-description (car charset)))))
		(t
		 "invalid designation information"))		   
	  (setq charset (cdr charset))))
      (setq graphic-register (1+ graphic-register)))))

;;;###autoload
(defun describe-coding-system (coding-system)
  "Display information of CODING-SYSTEM."
  (interactive "zDescribe coding system (default, current choices): ")
  (if (null coding-system)
      (describe-current-coding-system)
    (with-output-to-temp-buffer "*Help*"
      (print-coding-system-briefly coding-system 'doc-string)
      (let ((coding-spec (coding-system-spec coding-system)))
	(princ "Type: ")
	(let ((type (coding-system-type coding-system))
	      (flags (coding-system-flags coding-system)))
	  (princ type)
	  (cond ((eq type nil)
		 (princ " (do no conversion)"))
		((eq type t)
		 (princ " (do automatic conversion)"))
		((eq type 0)
		 (princ " (Emacs internal multibyte form)"))
		((eq type 1)
		 (princ " (Shift-JIS, MS-KANJI)"))
		((eq type 2)
		 (princ " (variant of ISO-2022)\n")
		 (princ "Initial designations:\n")
		 (print-designation flags)
		 (princ "Other Form: \n  ")
		 (princ (if (aref flags 4) "short-form" "long-form"))
		 (if (aref flags 5) (princ ", ASCII@EOL"))
		 (if (aref flags 6) (princ ", ASCII@CNTL"))
		 (princ (if (aref flags 7) ", 7-bit" ", 8-bit"))
		 (if (aref flags 8) (princ ", use-locking-shift"))
		 (if (aref flags 9) (princ ", use-single-shift"))
		 (if (aref flags 10) (princ ", use-roman"))
		 (if (aref flags 10) (princ ", use-old-jis"))
		 (if (aref flags 11) (princ ", no-ISO6429"))
		 (princ "."))
		((eq type 3)
		 (princ " (Big5)"))
		((eq type 4)
		 (princ " (do conversion by CCL program)"))
		(t (princ "invalid coding-system."))))
	(princ "\nEOL type:\n  ")
	(let ((eol-type (coding-system-eol-type coding-system)))
	  (cond ((vectorp eol-type)
		 (princ "Automatic selection from:\n\t")
		 (princ eol-type)
		 (princ "\n"))
		((or (null eol-type) (eq eol-type 0)) (princ "LF\n"))
		((eq eol-type 1) (princ "CRLF\n"))
		((eq eol-type 2) (princ "CR\n"))
		(t (princ "invalid\n")))))
      (save-excursion
	(set-buffer standard-output)
	(help-mode)))))

;;;###autoload
(defun describe-current-coding-system-briefly ()
  "Display coding systems currently used in a brief format in echo area.

The format is \"F[..],K[..],T[..],P>[..],P<[..], default F[..],P<[..],P<[..]\",
where mnemonics of the following coding systems come in this order
at the place of `..':
  buffer-file-coding-system (of the current buffer)
  eol-type of buffer-file-coding-system (of the current buffer)
  (keyboard-coding-system)
  eol-type of (keyboard-coding-system)
  (terminal-coding-system)
  eol-type of (terminal-coding-system)
  process-coding-system for read (of the current buffer, if any)
  eol-type of process-coding-system for read (of the current buffer, if any)
  process-coding-system for write (of the current buffer, if any)
  eol-type of process-coding-system for write (of the current buffer, if any)
  default-buffer-file-coding-system
  eol-type of default-buffer-file-coding-system
  default-process-coding-system for read
  eol-type of default-process-coding-system for read
  default-process-coding-system for write
  eol-type of default-process-coding-system"
  (interactive)
  (let* ((proc (get-buffer-process (current-buffer)))
	 (process-coding-systems (if proc (process-coding-system proc))))
    (message
     "F[%c%c],K[%c%c],T[%c%c],P>[%c%c],P<[%c%c], default F[%c%c],P>[%c%c],P<[%c%c]"
     (coding-system-mnemonic buffer-file-coding-system)
     (coding-system-eol-type-mnemonic buffer-file-coding-system)
     (coding-system-mnemonic (keyboard-coding-system))
     (coding-system-eol-type-mnemonic (keyboard-coding-system))
     (coding-system-mnemonic (terminal-coding-system))
     (coding-system-eol-type-mnemonic (terminal-coding-system))
     (coding-system-mnemonic (car process-coding-systems))
     (coding-system-eol-type-mnemonic (car process-coding-systems))
     (coding-system-mnemonic (cdr process-coding-systems))
     (coding-system-eol-type-mnemonic (cdr process-coding-systems))
     (coding-system-mnemonic default-buffer-file-coding-system)
     (coding-system-eol-type-mnemonic default-buffer-file-coding-system)
     (coding-system-mnemonic (car default-process-coding-system))
     (coding-system-eol-type-mnemonic (car default-process-coding-system))
     (coding-system-mnemonic (cdr default-process-coding-system))
     (coding-system-eol-type-mnemonic (cdr default-process-coding-system))
     )))

;; Print symbol name and mnemonic letter of CODING-SYSTEM by `princ'.
(defun print-coding-system-briefly (coding-system &optional doc-string)
  (if (not coding-system)
      (princ "nil\n")
    (princ (format "%c -- %s"
		   (coding-system-mnemonic coding-system)
		   coding-system))
    (let ((parent (coding-system-parent coding-system)))
      (if parent
	  (princ (format " (alias of %s)" parent))))
    (let ((aliases (get coding-system 'alias-coding-systems)))
      (if aliases
	  (princ (format " %S" (cons 'alias: aliases)))))
    (princ "\n")
    (if (and doc-string
	     (setq doc-string (coding-system-doc-string coding-system)))
	(princ (format "  %s\n" doc-string)))))

;;;###autoload
(defun describe-current-coding-system ()
  "Display coding systems currently used in a detailed format."
  (interactive)
  (with-output-to-temp-buffer "*Help*"
    (let* ((proc (get-buffer-process (current-buffer)))
	   (process-coding-systems (if proc (process-coding-system proc))))
      (princ "Coding system for saving this buffer:\n  ")
      (if (local-variable-p 'buffer-file-coding-system)
	  (print-coding-system-briefly buffer-file-coding-system)
	(princ "Not set locally, use the default.\n"))
      (princ "Default coding system (for new files):\n  ")
      (print-coding-system-briefly default-buffer-file-coding-system)
      (princ "Coding system for keyboard input:\n  ")
      (print-coding-system-briefly (keyboard-coding-system))
      (princ "Coding system for terminal output:\n  ")
      (print-coding-system-briefly (terminal-coding-system))
      (when (get-buffer-process (current-buffer))
	(princ "Coding systems for process I/O:\n")
	(princ "  encoding input to the process: ")
	(print-coding-system-briefly (cdr process-coding-systems))
	(princ "  decoding output from the process: ")
	(print-coding-system-briefly (car process-coding-systems)))
      (princ "Defaults for subprocess I/O:\n")
      (princ "  decoding: ")
      (print-coding-system-briefly (car default-process-coding-system))
      (princ "  encoding: ")
      (print-coding-system-briefly (cdr default-process-coding-system)))

    (save-excursion
      (set-buffer standard-output)

      (princ "\nPriority order for recognizing coding systems when reading files:\n")
      (let ((l coding-category-list)
	    (i 1)
	    (coding-list nil)
	    coding aliases)
	(while l
	  (setq coding (symbol-value (car l)))
	  (when (not (memq coding coding-list))
	    (setq coding-list (cons coding coding-list))
	    (princ (format "  %d. %s" i coding))
	    (when (setq aliases (get coding 'alias-coding-systems))
	      (princ " ")
	      (princ (cons 'alias: aliases)))
	    (terpri)
	    (setq i (1+ i)))
	  (setq l (cdr l))))
      (princ "\n  Other coding systems cannot be distinguished automatically
  from these, and therefore cannot be recognized automatically
  with the present coding system priorities.\n\n")

      (let ((categories '(coding-category-iso-7 coding-category-iso-7-else))
	    coding-system codings)
	(while categories
	  (setq coding-system (symbol-value (car categories)))
	  (mapcar
	   (function
	    (lambda (x)
	      (if (and (not (eq x coding-system))
		       (get x 'no-initial-designation)
		       (let ((flags (coding-system-flags x)))
			 (not (or (aref flags 10) (aref flags 11)))))
		  (setq codings (cons x codings)))))
	   (get (car categories) 'coding-systems))
	  (if codings
	      (let ((max-col (frame-width))
		    pos)
		(princ (format "  The followings are decoded correctly but recognized as %s:\n   " coding-system))
		(while codings
		  (setq pos (point))
		  (insert (format " %s" (car codings)))
		  (when (> (current-column) max-col)
		    (goto-char pos)
		    (insert "\n   ")
		    (goto-char (point-max)))
		  (setq codings (cdr codings)))
		(insert "\n\n")))
	  (setq categories (cdr categories))))

      (princ "Particular coding systems specified for certain file names:\n")
      (terpri)
      (princ "  OPERATION\tTARGET PATTERN\t\tCODING SYSTEM(s)\n")
      (princ "  ---------\t--------------\t\t----------------\n")
      (let ((func (lambda (operation alist)
		    (princ "  ")
		    (princ operation)
		    (if (not alist)
			(princ "\tnothing specified\n")
		      (while alist
			(indent-to 16)
			(prin1 (car (car alist)))
			(indent-to 40)
			(princ (cdr (car alist)))
			(princ "\n")
			(setq alist (cdr alist)))))))
	(funcall func "File I/O" file-coding-system-alist)
	(funcall func "Process I/O" process-coding-system-alist)
	(funcall func "Network I/O" network-coding-system-alist))
      (help-mode))))

;; Print detailed information on CODING-SYSTEM.
(defun print-coding-system (coding-system &optional aliases)
  (let ((type (coding-system-type coding-system))
	(eol-type (coding-system-eol-type coding-system))
	(flags (coding-system-flags coding-system))
	(base (coding-system-base coding-system)))
    (if (not (eq base coding-system))
	(princ (format "%s (alias of %s)\n" coding-system base))
      (princ coding-system)
      (while aliases
	(princ ",")
	(princ (car aliases))
	(setq aliases (cdr aliases)))
      (princ (format ":%s:%c:%d:"
		     type
		     (coding-system-mnemonic coding-system)
		     (if (integerp eol-type) eol-type 3)))
      (cond ((eq type 2)		; ISO-2022
	     (let ((idx 0)
		   charset)
	       (while (< idx 4)
		 (setq charset (aref flags idx))
		 (cond ((null charset)
			(princ -1))
		       ((eq charset t)
			(princ -2))
		       ((charsetp charset)
			(princ charset))
		       ((listp charset)
			(princ "(")
			(princ (car charset))
			(setq charset (cdr charset))
			(while charset
			  (princ ",")
			  (princ (car charset))
			  (setq charset (cdr charset)))
			(princ ")")))
		 (princ ",")
		 (setq idx (1+ idx)))
	       (while (< idx 12)
		 (princ (if (aref flags idx) 1 0))
		 (princ ",")
		 (setq idx (1+ idx)))
	       (princ (if (aref flags idx) 1 0))))
	    ((eq type 4)		; CCL
	     (let (i len)
	       (setq i 0 len (length (car flags)))
	       (while (< i len)
		 (princ (format " %x" (aref (car flags) i)))
		 (setq i (1+ i)))
	       (princ ",")
	       (setq i 0 len (length (cdr flags)))
	       (while (< i len)
		 (princ (format " %x" (aref (cdr flags) i)))
		 (setq i (1+ i)))))
	    (t (princ 0)))
      (princ ":")
      (princ (coding-system-doc-string coding-system))
      (princ "\n"))))

;;;###autoload
(defun list-coding-systems (&optional arg)
  "Display a list of all coding systems.
It prints mnemonic letter, name, and description of each coding systems.

With prefix arg, the output format gets more cryptic,
but contains full information about each coding systems."
  (interactive "P")
  (with-output-to-temp-buffer "*Help*"
    (if (null arg)
	(princ "\
###############################################
# List of coding systems in the following format:
# MNEMONIC-LETTER -- CODING-SYSTEM-NAME
#	DOC-STRING
")
      (princ "\
#########################
## LIST OF CODING SYSTEMS
## Each line corresponds to one coding system
## Format of a line is:
##   NAME[,ALIAS...]:TYPE:MNEMONIC:EOL:FLAGS:POST-READ-CONVERSION
##	:PRE-WRITE-CONVERSION:DOC-STRING,
## where
##  NAME = coding system name
##  ALIAS = alias of the coding system
##  TYPE = nil (no conversion), t (undecided or automatic detection),
##         0 (EMACS-MULE), 1 (SJIS), 2 (ISO2022), 3 (BIG5), or 4 (CCL)
##  EOL = 0 (LF), 1 (CRLF), 2 (CR), or 3 (Automatic detection)
##  FLAGS =
##    if TYPE = 2 then
##      comma (`,') separated data of the followings:
##        G0, G1, G2, G3, SHORT-FORM, ASCII-EOL, ASCII-CNTL, SEVEN,
##        LOCKING-SHIFT, SINGLE-SHIFT, USE-ROMAN, USE-OLDJIS, NO-ISO6429
##    else if TYPE = 4 then
##      comma (`,') separated CCL programs for read and write
##    else
##      0
##  POST-READ-CONVERSION, PRE-WRITE-CONVERSION = function name to be called
##
"))
    (let ((bases (coding-system-list 'base-only))
	  coding-system)
      (while bases
	(setq coding-system (car bases))
	(if (null arg)
	    (print-coding-system-briefly coding-system 'doc-string)
	  (print-coding-system coding-system))
	(setq bases (cdr bases))))))

;;;###automatic
(defun list-coding-categories ()
  "Display a list of all coding categories."
  (with-output-to-temp-buffer "*Help*"
    (princ "\
############################
## LIST OF CODING CATEGORIES (ordered by priority)
## CATEGORY:CODING-SYSTEM
##
")
    (let ((l coding-category-list))
      (while l
	(princ (format "%s:%s\n" (car l) (symbol-value (car l))))
	(setq l (cdr l))))))

;;; FONT

;; Print information of a font in FONTINFO.
(defun describe-font-internal (font-info &optional verbose)
  (print-list "name (opened by):" (aref font-info 0))
  (print-list "       full name:" (aref font-info 1))
  (let ((charset (aref font-info 2)))
    (print-list "   charset:"
		(format "%s (%s)" charset (charset-description charset))))
  (print-list "            size:" (format "%d" (aref font-info 3)))
  (print-list "          height:" (format "%d" (aref font-info 4)))
  (print-list " baseline-offset:" (format "%d" (aref font-info 5)))
  (print-list "relative-compose:" (format "%d" (aref font-info 6))))

;;;###autoload
(defun describe-font (fontname)
  "Display information about fonts which partially match FONTNAME."
  (interactive "sFontname (default, current choise for ASCII chars): ")
  (or window-system
      (error "No window system being used"))
  (when (or (not fontname) (= (length fontname) 0))
    (setq fontname (cdr (assq 'font (frame-parameters))))
    (if (query-fontset fontname)
	(setq fontname
	      (nth 2 (assq 'ascii (aref (fontset-info fontname) 2))))))
  (let ((font-info (font-info fontname)))
    (if (null font-info)
	(message "No matching font")
      (with-output-to-temp-buffer "*Help*"
	(describe-font-internal font-info 'verbose)))))

;; Print information of FONTSET.  If optional arg PRINT-FONTS is
;; non-nil, print also names of all fonts in FONTSET.  This function
;; actually INSERT such information in the current buffer.
(defun print-fontset (fontset &optional print-fonts)
  (let* ((fontset-info (fontset-info fontset))
	 (size (aref fontset-info 0))
	 (height (aref fontset-info 1))
	 (fonts (and print-fonts (aref fontset-info 2)))
	 (xlfd-fields (x-decompose-font-name fontset))
	 style)
    (if xlfd-fields
	(let ((weight (aref xlfd-fields xlfd-regexp-weight-subnum))
	      (slant  (aref xlfd-fields xlfd-regexp-slant-subnum)))
	  (if (string-match "^bold$\\|^demibold$" weight)
	      (setq style (concat weight " "))
	    (setq style "medium "))
	  (cond ((string-match "^i$" slant)
		 (setq style (concat style "italic")))
		((string-match "^o$" slant)
		 (setq style (concat style "slant")))
		((string-match "^ri$" slant)
		 (setq style (concat style "reverse italic")))
		((string-match "^ro$" slant)
		 (setq style (concat style "reverse slant")))))
      (setq style " ? "))
    (beginning-of-line)
    (insert fontset)
    (indent-to 58)
    (insert (if (> size 0) (format "%2dx%d" size height) "  -"))
    (indent-to 64)
    (insert style "\n")
    (when print-fonts
      (insert "  O Charset / Fontname\n"
	      "  - ------------------\n")
      (sort-charset-list)
      (let ((l charset-list)
	    charset font-info opened fontname)
	(while l
	  (setq charset (car l) l (cdr l))
	  (setq font-info (assq charset fonts))
	  (if (null font-info)
	      (setq opened ?? fontname "not specified")
	    (if (nth 2 font-info)
		(if (stringp (nth 2 font-info))
		    (setq opened ?o fontname (nth 2 font-info))
		  (setq opened ?- fontname (nth 1 font-info)))
	      (setq opened ?x fontname (nth 1 font-info))))
	  (insert (format "  %c %s\n    %s\n"
			  opened charset fontname)))))))

;;;###autoload
(defun describe-fontset (fontset)
  "Display information of FONTSET.

It prints name, size, and style of FONTSET, and lists up fonts
contained in FONTSET.

The column WDxHT contains width and height (pixels) of each fontset
\(i.e. those of ASCII font in the fontset).  The letter `-' in this
column means that the corresponding fontset is not yet used in any
frame.

The O column of each font contains one of the following letters.
 o -- font already opened
 - -- font not yet opened
 x -- font can't be opened
 ? -- no font specified

The Charset column of each font contains a name of character set
displayed by the font."
  (interactive
   (if (not window-system)
       (error "No window system being used")
     (let ((fontset-list (mapcar '(lambda (x) (list x)) (fontset-list)))
	   (completion-ignore-case t))
       (list (completing-read
	      "Fontset (default, used by the current frame): "
	      fontset-list nil t)))))
  (if (= (length fontset) 0)
      (setq fontset (cdr (assq 'font (frame-parameters)))))
  (if (not (query-fontset fontset))
      (error "Current frame is using font, not fontset"))
  (let ((fontset-info (fontset-info fontset)))
    (with-output-to-temp-buffer "*Help*"
      (save-excursion
	(set-buffer standard-output)
	(insert "Fontset-Name\t\t\t\t\t\t  WDxHT Style\n")
	(insert "------------\t\t\t\t\t\t  ----- -----\n")
	(print-fontset fontset t)))))

;;;###autoload
(defun list-fontsets (arg)
  "Display a list of all fontsets.

It prints name, size, and style of each fontset.
With prefix arg, it also lists up fonts contained in each fontset.
See the function `describe-fontset' for the format of the list."
  (interactive "P")
  (with-output-to-temp-buffer "*Help*"
    (save-excursion
      (set-buffer standard-output)
      (insert "Fontset-Name\t\t\t\t\t\t  WDxHT Style\n")
      (insert "------------\t\t\t\t\t\t  ----- -----\n")
      (let ((fontsets (fontset-list)))
	(while fontsets
	  (print-fontset (car fontsets) arg)
	  (setq fontsets (cdr fontsets)))))))

;;;###autoload
(defun list-input-methods ()
  "Print information of all input methods."
  (interactive)
  (with-output-to-temp-buffer "*Help*"
    (princ "LANGUAGE\n  NAME (`TITLE' in mode line)\n")
    (princ "    SHORT-DESCRIPTION\n------------------------------\n")
    (setq input-method-alist
	  (sort input-method-alist
		(function (lambda (x y) (string< (nth 1 x) (nth 1 y))))))
    (let ((l input-method-alist)
	  language elt)
      (while l
	(setq elt (car l) l (cdr l))
	(when (not (equal language (nth 1 elt)))
	  (setq language (nth 1 elt))
	  (princ language)
	  (terpri))
	(princ (format "  %s (`%s' in mode line)\n    %s\n"
		       (car elt) (nth 3 elt)
		       (let ((title (nth 4 elt)))
			 (string-match ".*" title)
			 (match-string 0 title))))))))

;;; DIAGNOSIS

;; Insert a header of a section with SECTION-NUMBER and TITLE.
(defun insert-section (section-number title)
  (insert "########################################\n"
	  "# Section " (format "%d" section-number) ".  " title "\n"
	  "########################################\n\n"))

;;;###autoload
(defun mule-diag ()
  "Display diagnosis of the multilingual environment (MULE).

It prints various information related to the current multilingual
environment, including lists of input methods, coding systems,
character sets, and fontsets (if Emacs running under some window
system)."
  (interactive)
  (with-output-to-temp-buffer "*Mule-Diagnosis*"
    (save-excursion
      (set-buffer standard-output)
      (insert "\t###############################\n"
	      "\t### Diagnosis of your Emacs ###\n"
	      "\t###############################\n\n"
	      "CONTENTS: Section 1.  General Information\n"
	      "          Section 2.  Display\n"
	      "          Section 3.  Input methods\n"
	      "          Section 4.  Coding systems\n"
	      "          Section 5.  Character sets\n")
      (if window-system
	  (insert "          Section 6.  Fontsets\n"))
      (insert "\n")

      (insert-section 1 "General Information")
      (insert "Version of this emacs:\n  " (emacs-version) "\n\n")

      (insert-section 2 "Display")
      (if window-system
	  (insert "Window-system: "
		  (symbol-name window-system)
		  (format "%s" window-system-version))
	(insert "Terminal: " (getenv "TERM")))
      (insert "\n\n")

      (if (eq window-system 'x)
	  (let ((font (cdr (assq 'font (frame-parameters)))))
	    (insert "The selected frame is using the "
		    (if (query-fontset font) "fontset" "font")
		    ":\n\t" font))
	(insert "Coding system of the terminal: "
		(symbol-name (terminal-coding-system))))
      (insert "\n\n")

      (insert-section 3 "Input methods")
      (save-excursion (list-input-methods))
      (insert-buffer-substring "*Help*")
      (insert "\n")
      (if default-input-method
	  (insert "Default input method: " default-input-method "\n")
	(insert "No default input method is specified\n"))

      (insert-section 4 "Coding systems")
      (save-excursion (list-coding-systems t))
      (insert-buffer-substring "*Help*")
      (save-excursion (list-coding-categories))
      (insert-buffer-substring "*Help*")
      (insert "\n")

      (insert-section 5 "Character sets")
      (save-excursion (list-character-sets t))
      (insert-buffer-substring "*Help*")
      (insert "\n")

      (when window-system
	(insert-section 6 "Fontsets")
	(save-excursion (list-fontsets t))
	(insert-buffer-substring "*Help*"))
      (help-mode))))


;;; DUMP DATA FILE

;;;###autoload
(defun dump-charsets ()
  "Dump information of all charsets into the file \"CHARSETS\".
The file is saved in the directory `data-directory'."
  (let ((file (expand-file-name "CHARSETS" data-directory))
	buf)
    (or (file-writable-p file)
	(error "Can't write to file %s" file))
    (setq buf (find-file-noselect file))
    (save-window-excursion
      (save-excursion
	(set-buffer buf)
	(setq buffer-read-only nil)
	(erase-buffer)
	(list-character-sets t)
	(insert-buffer-substring "*Help*")
	(let (make-backup-files
	      coding-system-for-write)
	  (save-buffer))))
    (kill-buffer buf))
  (if noninteractive
      (kill-emacs)))

;;;###autoload
(defun dump-codings ()
  "Dump information of all coding systems into the file \"CODINGS\".
The file is saved in the directory `data-directory'."
  (let ((file (expand-file-name "CODINGS" data-directory))
	buf)
    (or (file-writable-p file)
	(error "Can't write to file %s" file))
    (setq buf (find-file-noselect file))
    (save-window-excursion
      (save-excursion
	(set-buffer buf)
	(setq buffer-read-only nil)
	(erase-buffer)
	(list-coding-systems t)
	(insert-buffer-substring "*Help*")
	(list-coding-categories)
	(insert-buffer-substring "*Help*")
	(let (make-backup-files
	      coding-system-for-write)
	  (save-buffer))))
    (kill-buffer buf))
  (if noninteractive
      (kill-emacs)))

;;; mule-diag.el ends here