mule-cmds.el 23.6 KB
Newer Older
Karl Heuer's avatar
Karl Heuer committed
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
;;; mule-cmds.el --- Commands for mulitilingual environment

;; Copyright (C) 1995 Free Software Foundation, Inc.
;; Copyright (C) 1995 Electrotechnical Laboratory, JAPAN.

;; Keywords: mule, multilingual

;; 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
Karl Heuer's avatar
Karl Heuer committed
21 22 23
;; 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.
Karl Heuer's avatar
Karl Heuer committed
24 25 26 27 28

;;; Code:

;;; MULE related key bindings and menus.

29
(defvar mule-keymap nil
Karl Heuer's avatar
Karl Heuer committed
30
  "Keymap for MULE (Multilingual environment) specific commands.")
31
(define-prefix-command 'mule-keymap)
Karl Heuer's avatar
Karl Heuer committed
32

33
;; Keep "C-x C-m ..." for mule specific commands.
34
(define-key ctl-x-map "\C-m" 'mule-keymap)
Kenichi Handa's avatar
Kenichi Handa committed
35

Karl Heuer's avatar
Karl Heuer committed
36 37 38
(define-key mule-keymap "m" 'toggle-enable-multibyte-characters)
(define-key mule-keymap "f" 'set-buffer-file-coding-system)
(define-key mule-keymap "t" 'set-terminal-coding-system)
39 40
(define-key mule-keymap "k" 'set-keyboard-coding-system)
(define-key mule-keymap "p" 'set-buffer-process-coding-system)
41
(define-key mule-keymap "\C-\\" 'select-input-method)
42
(define-key mule-keymap "c" 'universal-coding-system-argument)
Karl Heuer's avatar
Karl Heuer committed
43 44 45 46 47 48

(define-key help-map "\C-L" 'describe-language-support)
(define-key help-map "\C-\\" 'describe-input-method)
(define-key help-map "C" 'describe-current-coding-system)
(define-key help-map "h" 'view-hello-file)

49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120
(defvar mule-menu-keymap nil
  "Keymap for MULE (Multilingual environment) menu specific commands.")
(define-prefix-command 'mule-menu-keymap)

(define-key global-map [menu-bar mule] (cons "Mule" mule-menu-keymap))

(setq menu-bar-final-items (cons 'mule menu-bar-final-items))

(defvar describe-language-support-map nil)
(define-prefix-command 'describe-language-support-map)

(defvar setup-language-environment-map nil)
(define-prefix-command 'setup-language-environment-map)

(defvar set-coding-system-map nil)
(define-prefix-command 'set-coding-system-map)

(define-key-after mule-menu-keymap [toggle-mule]
  '("Toggle MULE facility" . toggle-enable-multibyte-characters)
  t)
(define-key-after mule-menu-keymap [describe-language-support]
  '("Describe language support" . describe-language-support-map)
  t)
(define-key-after mule-menu-keymap [set-language-environment]
  '("Set language environment" . setup-language-environment-map)
  t)
(define-key-after mule-menu-keymap [separator-mule]
  '("--")
  t)
(define-key-after mule-menu-keymap [toggle-input-method]
  '("Toggle input method" . toggle-input-method)
  t)
(define-key-after mule-menu-keymap [select-input-method]
  '("Select input method" . select-input-method)
  t)
(define-key-after mule-menu-keymap [describe-input-method]
  '("Describe input method" . describe-input-method)
  t)
(define-key-after mule-menu-keymap [separator-input-method]
  '("--")
  t)
(define-key-after mule-menu-keymap [describe-current-coding-system]
  '("Describe coding systems" . describe-current-coding-system)
  t)
(define-key-after mule-menu-keymap [set-various-coding-system]
  '("Set coding systems" . set-coding-system-map)
  t)
(define-key-after mule-menu-keymap [separator-coding-system]
  '("--")
  t)
(define-key-after mule-menu-keymap [mule-diag]
  '("Show diagnosis for MULE" . mule-diag)
  t)
(define-key-after mule-menu-keymap [view-hello-file]
  '("Show many languages" . view-hello-file)
  t)

(define-key-after set-coding-system-map [set-buffer-file-coding-system]
  '("Buffer file" . set-buffer-file-coding-system)
  t)
(define-key-after set-coding-system-map [set-terminal-coding-system]
  '("Terminal" . set-terminal-coding-system)
  t)
(define-key-after set-coding-system-map [set-keyboard-coding-system]
  '("Keyboard" . set-keyboard-coding-system)
  t)
(define-key-after set-coding-system-map [set-buffer-process-coding-system]
  '("Buffer process" . set-buffer-process-coding-system)
  t)

(define-key setup-language-environment-map
  [Default] '("Default" . setup-specified-language-environment))
Karl Heuer's avatar
Karl Heuer committed
121 122 123 124

;; These are meaningless when running under X.
(put 'set-terminal-coding-system 'menu-enable
     '(null window-system))
125 126
(put 'set-keyboard-coding-system 'menu-enable
     '(null window-system))
Karl Heuer's avatar
Karl Heuer committed
127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147

;; This should be a single character key binding because users use it
;; very frequently while editing multilingual text.  Now we can use
;; only two such keys: "\C-\\" and "\C-^", but the latter is not
;; convenient because it requires shifting on most keyboards.  An
;; alternative is "\C-\]" which is now bound to `abort-recursive-edit'
;; but it won't be used that frequently.
(define-key global-map "\C-\\" 'toggle-input-method)

(defun toggle-enable-multibyte-characters (&optional arg)
  "Change whether this buffer enables multibyte characters.
With arg, make them enable iff arg is positive."
  (interactive "P")
  (setq enable-multibyte-characters
	(if (null arg) (null enable-multibyte-characters)
	  (> (prefix-numeric-value arg) 0)))
  (force-mode-line-update))

(defun view-hello-file ()
  "Display the HELLO file which list up many languages and characters."
  (interactive)
148 149 150 151
  ;; We have to decode the file in any environment.
  (let ((default-enable-multibyte-characters t)
	(coding-system-for-read 'iso-2022-7))
    (find-file-read-only (expand-file-name "HELLO" data-directory))))
Karl Heuer's avatar
Karl Heuer committed
152

153 154 155 156 157 158 159 160 161 162 163 164
(defun universal-coding-system-argument ()
  "Execute an I/O command using the specified coding system."
  (interactive)
  (let* ((coding-system (read-coding-system "Coding system: "))
	 (keyseq (read-key-sequence
		  (format "With coding system %s:" coding-system)))
	 (cmd (key-binding keyseq)))
    (let ((coding-system-for-read coding-system)
	  (coding-system-for-write coding-system))
      (message "")
      (call-interactively cmd))))

Karl Heuer's avatar
Karl Heuer committed
165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184

;;; Language support staffs.

(defvar primary-language "English"
  "Name of a user's primary language.
Emacs provide various language supports based on this variable.")

(defvar language-info-alist nil
  "Alist of language names vs the corresponding information of various kind.
Each element looks like:
	(LANGUAGE-NAME . ((KEY . INFO) ...))
where LANGUAGE-NAME is a string,
KEY is a symbol denoting the kind of information,
INFO is any Lisp object which contains the actual information related
to KEY.")

(defun get-language-info (language-name key)
  "Return the information for LANGUAGE-NAME of the kind KEY.
LANGUAGE-NAME is a string.
KEY is a symbol denoting the kind of required information."
185
  (let ((lang-slot (assoc-ignore-case language-name language-info-alist)))
Karl Heuer's avatar
Karl Heuer committed
186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202
    (if lang-slot
	(cdr (assq key (cdr lang-slot))))))

(defun set-language-info (language-name key info)
  "Set for LANGUAGE-NAME the information INFO under KEY.
LANGUAGE-NAME is a string
KEY is a symbol denoting the kind of information.
INFO is any Lisp object which contains the actual information.

Currently, the following KEYs are used by Emacs:
charset: list of symbols whose values are charsets specific to the language.
coding-system: list of coding systems specific to the langauge.
tutorial: a tutorial file name written in the language.
sample-text: one line short text containing characters of the language.
input-method: alist of input method names for the language vs information
  for activating them.  Use `register-input-method' (which see)
  to add a new input method to the alist.
203 204 205
documentation: t or a string describing how Emacs supports the language.
  If a string is specified, it is shown before any other information
  of the language by the command describe-language-support.
206
setup-function: a function to call for setting up environment
207 208 209 210 211 212 213 214
 convenient for a user of the language.

If KEY is documentation or setup-function, you can also specify
a cons cell as INFO, in which case, the car part should be
a normal value as INFO for KEY (as described above),
and the cdr part should be a symbol whose value is a menu keymap
in which an entry for the language is defined.  But, only the car part
is actually set as the information.
215 216 217

Emacs will use more KEYs in the future.  To avoid conflict, users
should use prefix \"user-\" in the name of KEY if he wants to set
218
different kind of information for personal use."
Karl Heuer's avatar
Karl Heuer committed
219 220 221 222 223 224 225 226 227 228 229
  (let (lang-slot key-slot)
    (setq lang-slot (assoc language-name language-info-alist))
    (if (null lang-slot)		; If no slot for the language, add it.
	(setq lang-slot (list language-name)
	      language-info-alist (cons lang-slot language-info-alist)))
    (setq key-slot (assq key lang-slot))
    (if (null key-slot)			; If no slot for the key, add it.
	(progn
	  (setq key-slot (list key))
	  (setcdr lang-slot (cons key-slot (cdr lang-slot)))))
    ;; Setup menu.
230
    (cond ((eq key 'documentation)
231 232 233 234 235
	   (define-key-after
	     (if (consp info)
		 (prog1 (symbol-value (cdr info))
		   (setq info (car info)))
	       describe-language-support-map)
Kenichi Handa's avatar
Kenichi Handa committed
236
	     (vector (intern language-name))
237
	     (cons language-name 'describe-specified-language-support)
238
	     t))
Kenichi Handa's avatar
Kenichi Handa committed
239
	  ((eq key 'setup-function)
240 241 242 243 244
	   (define-key-after
	     (if (consp info)
		 (prog1 (symbol-value (cdr info))
		   (setq info (car info)))
	       setup-language-environment-map)
Kenichi Handa's avatar
Kenichi Handa committed
245
	     (vector (intern language-name))
246
	     (cons language-name 'setup-specified-language-environment)
247
	     t)))
248 249

    (setcdr key-slot info)
Karl Heuer's avatar
Karl Heuer committed
250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267
    ))

(defun set-language-info-alist (language-name alist)
  "Set for LANGUAGE-NAME the information in ALIST.
ALIST is an alist of KEY and INFO.  See the documentation of
`set-langauge-info' for the meanings of KEY and INFO."
  (while alist
    (set-language-info language-name (car (car alist)) (cdr (car alist)))
    (setq alist (cdr alist))))

(defun read-language-name (key prompt &optional initial-input)
  "Read language name which has information for KEY, prompting with PROMPT."
  (let* ((completion-ignore-case t)
	 (name (completing-read prompt
				language-info-alist
				(function (lambda (elm) (assq key elm)))
				t
				initial-input)))
268 269 270
    (if (and (> (length name) 0)
	     (get-language-info name key))
	name)))
Karl Heuer's avatar
Karl Heuer committed
271 272 273 274 275 276 277 278 279 280 281 282

;;; Multilingual input methods.

(defvar current-input-method nil
  "The current input method for multilingual text.
The value is a cons of language name and input method name.
If nil, it means no input method is activated now.")
(make-variable-buffer-local 'current-input-method)
(put 'current-input-method 'permanent-local t)

(defvar current-input-method-title nil
  "Title string of the current input method shown in mode line.
283
Every input method should set this to an appropriate value when activated.")
Karl Heuer's avatar
Karl Heuer committed
284 285 286 287 288 289 290 291
(make-variable-buffer-local 'current-input-method-title)
(put 'current-input-method-title 'permanent-local t)

(defvar default-input-method nil
  "Default input method.
The default input method is the one activated automatically by the command
`toggle-input-method' (\\[toggle-input-method]).
The value is a cons of language name and input method name.")
292 293
(make-variable-buffer-local 'default-input-method)
(put 'default-input-method 'permanent-local t)
Karl Heuer's avatar
Karl Heuer committed
294 295 296

(defvar default-input-method-title nil
  "Title string of the default input method.")
297 298
(make-variable-buffer-local 'default-input-method-title)
(put 'default-input-method-title 'permanent-local t)
Karl Heuer's avatar
Karl Heuer committed
299 300 301 302 303

(defvar previous-input-method nil
  "Input method selected previously.
This is the one selected before the current input method is selected.
See also the documentation of `default-input-method'.")
304 305
(make-variable-buffer-local 'previous-input-method)
(put 'previous-input-method 'permanent-local t)
Karl Heuer's avatar
Karl Heuer committed
306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338

(defvar inactivate-current-input-method-function nil
  "Function to call for inactivating the current input method.
Every input method should set this to an appropriate value when activated.
This function is called with no argument.")
(make-variable-buffer-local 'inactivate-current-input-method-function)
(put 'inactivate-current-input-method-function 'permanent-local t)

(defvar describe-current-input-method-function nil
  "Function to call for describing the current input method.
This function is called with no argument.")
(make-variable-buffer-local 'describe-current-input-method-function)
(put 'describe-current-input-method-function 'permanent-local t)

(defun register-input-method (language-name input-method)
  "Register INPUT-METHOD as an input method of LANGUAGE-NAME.
LANGUAGE-NAME is a string.
INPUT-METHOD is a list of the form:
	(METHOD-NAME ACTIVATE-FUNC ARG ...)
where METHOD-NAME is the name of this method,
ACTIVATE-FUNC is the function to call for activating this method.
Arguments for the function are METHOD-NAME and ARGs."
  (let ((slot (get-language-info language-name 'input-method))
	method-slot)
    (if (null slot)
	(set-language-info language-name 'input-method (list input-method))
      (setq method-slot (assoc (car input-method) slot))
      (if method-slot
	  (setcdr method-slot (cdr input-method))
	(set-language-info language-name 'input-method
			   (cons input-method slot))))))

(defun read-language-and-input-method-name ()
339 340 341 342 343 344
  "Read a language name and the corresponding input method from a minibuffer.
Return a list of those names."
  (let* ((default-val (or previous-input-method default-input-method))
	 (language-name (read-language-name
			 'input-method "Language: "
			 (if default-val (cons (car default-val) 0)))))
Karl Heuer's avatar
Karl Heuer committed
345 346
    (if (null language-name)
	(error "No input method for the specified language"))
347 348 349
    (if (not (string= language-name (car default-val)))
	;; Now the default value has no meaning.
	(setq default-val nil))
Karl Heuer's avatar
Karl Heuer committed
350
    (let* ((completion-ignore-case t)
Kenichi Handa's avatar
Kenichi Handa committed
351 352
	   (key-slot (cdr (assq 'input-method
				(assoc language-name language-info-alist))))
Karl Heuer's avatar
Karl Heuer committed
353
	   (method-name
Kenichi Handa's avatar
Kenichi Handa committed
354
	    (completing-read "Input method: " key-slot nil t
355
			     (if default-val (cons (cdr default-val) 0)))))
Karl Heuer's avatar
Karl Heuer committed
356 357
      (if (= (length method-name) 0)
	  (error "No input method specified"))
Kenichi Handa's avatar
Kenichi Handa committed
358
      (list language-name
359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386
	    (car (assoc-ignore-case method-name key-slot))))))

;; Actvate input method METHOD-NAME for langauge LANGUAGE-NAME.
(defun activate-input-method (language-name method-name)
  (if (and current-input-method
	   (or (not (string= (car current-input-method) language-name))
	       (not (string= (cdr current-input-method) method-name))))
      (inactivate-input-method))
  (or current-input-method
      (let* ((key-slot (get-language-info language-name 'input-method))
	     (method-slot (cdr (assoc method-name key-slot))))
	(if (null method-slot)
	    (error "Invalid input method `%s' for  %s"
		   method-name language-name))
	(apply (car method-slot) method-name (cdr method-slot))
	(setq current-input-method (cons language-name method-name))
	(if (not (equal default-input-method current-input-method))
	    (progn
	      (setq previous-input-method default-input-method)
	      (setq default-input-method current-input-method)
	      (setq default-input-method-title current-input-method-title))))))

;; Inactivate the current input method.
(defun inactivate-input-method ()
  (if current-input-method
      (unwind-protect
	  (funcall inactivate-current-input-method-function)
	(setq current-input-method nil))))
Karl Heuer's avatar
Karl Heuer committed
387 388 389

(defun select-input-method (language-name method-name)
  "Select and activate input method METHOD-NAME for inputting LANGUAGE-NAME.
390 391 392
Both the default and local values of default-input-method are
set to the selected input method.

Karl Heuer's avatar
Karl Heuer committed
393 394 395 396 397 398 399
The information for activating METHOD-NAME is stored
in `language-info-alist' under the key 'input-method.
The format of the information has the form:
	((METHOD-NAME ACTIVATE-FUNC ARG ...) ...)
where ACTIVATE-FUNC is a function to call for activating this method.
Arguments for the function are METHOD-NAME and ARGs."
  (interactive (read-language-and-input-method-name))
400 401 402
  (activate-input-method language-name method-name)
  (setq-default default-input-method default-input-method)
  (setq-default default-input-method-title default-input-method-title))
Karl Heuer's avatar
Karl Heuer committed
403 404

(defun toggle-input-method (&optional arg)
405 406 407 408 409 410
  "Turn on or off a multilingual text input method for the current buffer.
With arg, turn on an input method specified interactively.
Without arg, if some input method is currently activated, turn it off,
else turn on default-input-method (which see).
In the latter case, if default-input-method is nil, select an input method
interactively."
Karl Heuer's avatar
Karl Heuer committed
411 412
  (interactive "P")
  (if arg
413 414 415 416 417 418
      (let ((input-method (read-language-and-input-method-name)))
	(activate-input-method (car input-method) (nth 1 input-method)))
    (if current-input-method
	(inactivate-input-method)
      (if default-input-method
	  (activate-input-method (car default-input-method)
Karl Heuer's avatar
Karl Heuer committed
419
				 (cdr default-input-method))
420 421
	(let ((input-method (read-language-and-input-method-name)))
	  (activate-input-method (car input-method) (nth 1 input-method)))))))
Karl Heuer's avatar
Karl Heuer committed
422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439

(defun describe-input-method ()
  "Describe the current input method."
  (interactive)
  (if current-input-method
      (if (and (symbolp describe-current-input-method-function)
	       (fboundp describe-current-input-method-function))
	  (funcall describe-current-input-method-function)
	(message "No way to describe the current input method `%s'"
		 (cdr current-input-method))
	(ding))
    (message "No input method is activated now")
    (ding)))

(defun read-multilingual-string (prompt &optional initial-input
					language-name method-name)
  "Read a multilingual string from minibuffer, prompting with string PROMPT.
The input method selected last time is activated in minibuffer.
440 441
If optional second arg INITIAL-INPUT is non-nil, insert it in the minibuffer
 initially
Karl Heuer's avatar
Karl Heuer committed
442 443
Optional 3rd and 4th arguments LANGUAGE-NAME and METHOD-NAME specify
 the input method to be activated instead of the one selected last time."
444
  (let ((default-input-method default-input-method))
Karl Heuer's avatar
Karl Heuer committed
445
    (if (and language-name method-name)
446 447 448 449 450 451 452
	(setq default-input-method (cons language-name method-name))
      (or default-input-method
	  (let ((lang-and-input-method (read-language-and-input-method-name)))
	    (setq default-input-method (cons (car lang-and-input-method)
					     (nth 1 lang-and-input-method))))))
    (let ((minibuffer-setup-hook '(toggle-input-method)))
      (read-string prompt initial-input))))
Karl Heuer's avatar
Karl Heuer committed
453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472

;; Variables to control behavior of input methods.  All input methods
;; should react to these variables.

(defvar input-method-tersely-flag nil
  "*If this flag is non-nil, input method works rather tersely.

For instance, Quail input method does not show guidance buffer while
inputting at minibuffer if this flag is t.")

(defvar input-method-activate-hook nil
  "Normal hook run just after an input method is activated.")

(defvar input-method-inactivate-hook nil
  "Normal hook run just after an input method is inactivated.")

(defvar input-method-after-insert-chunk-hook nil
  "Normal hook run just after an input method insert some chunk of text.")


473 474 475 476 477 478 479 480 481 482 483 484 485
(defun setup-specified-language-environment ()
  "Setup multi-lingual environment convenient for the specified language."
  (interactive)
  (let (language-name func)
    (if (and (symbolp last-command-event)
	     (or (not (eq last-command-event 'Default))
		 (setq last-command-event 'English))
	     (setq language-name (symbol-name last-command-event))
	     (setq func (get-language-info language-name 'setup-function)))
	(progn
	  (funcall func)
	  (force-mode-line-update t))
      (error "Bogus calling sequence"))))
Karl Heuer's avatar
Karl Heuer committed
486

487 488
;;;###autoload
(defun set-language-environment (language-name)
489 490 491
  "Set up multi-lingual environment for using LANGUAGE-NAME.
This sets the coding system priority and the default input method
and sometimes other things."
Karl Heuer's avatar
Karl Heuer committed
492
  (interactive (list (read-language-name 'setup-function "Language: ")))
493 494 495 496 497
  (if (or (null language-name)
	  (null (get-language-info language-name 'setup-function)))
      (error "No way to setup environment for the specified language"))
  (let ((last-command-event (intern language-name)))
    (setup-specified-language-environment)))
Karl Heuer's avatar
Karl Heuer committed
498 499 500 501 502 503

;; Print all arguments with `princ', then print "\n".
(defsubst princ-list (&rest args)
  (while args (princ (car args)) (setq args (cdr args)))
  (princ "\n"))

504
;; Print a language specific information such as input methods,
505
;; charsets, and coding systems.  This function is intended to be
506 507 508 509 510 511 512 513 514 515 516 517
;; called from the menu:
;;   [menu-bar mule describe-language-support LANGUAGE]
;; and should not run it by `M-x describe-current-input-method-function'.
(defun describe-specified-language-support ()
  "Describe how Emacs supports the specified langugage."
  (interactive)
  (let (language-name doc)
    (if (not (and (symbolp last-command-event)
		  (setq language-name (symbol-name last-command-event))
		  (setq doc (get-language-info language-name 'documentation))))
	(error "Bogus calling sequence"))
    (with-output-to-temp-buffer "*Help*"
518
      (if (stringp doc)
519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546
	  (princ-list doc))
      (princ "-----------------------------------------------------------\n")
      (princ-list "List of items specific to "
		  language-name
		  " support")
      (princ "-----------------------------------------------------------\n")
      (let ((str (get-language-info language-name 'sample-text)))
	(if (stringp str)
	    (progn
	      (princ "<sample text>\n")
	      (princ-list "  " str))))
      (princ "<input methods>\n")
      (let ((l (get-language-info language-name 'input-method)))
	(while l
	  (princ-list "  " (car (car l)))
	  (setq l (cdr l))))
      (princ "<character sets>\n")
      (let ((l (get-language-info language-name 'charset)))
	(if (null l)
	    (princ-list "  nothing specific to " language-name)
	  (while l
	    (princ-list "  " (car l) ": "
			(charset-description (car l)))
	    (setq l (cdr l)))))
      (princ "<coding systems>\n")
      (let ((l (get-language-info language-name 'coding-system)))
	(if (null l)
	    (princ-list "  nothing specific to " language-name)
547
	  (while l
548 549 550
	    (princ-list "  " (car l) ":\n\t"
			(coding-system-docstring (car l)))
	    (setq l (cdr l))))))))
551 552 553 554 555 556 557 558 559

(defun describe-language-support (language-name)
  "Describe how Emacs supports LANGUAGE-NAME."
  (interactive (list (read-language-name 'documentation "Language: ")))
  (if (or (null language-name)
	  (null (get-language-info language-name 'documentation)))
      (error "No documentation for the specified language"))
  (let ((last-command-event (intern language-name)))
    (describe-specified-language-support)))
Karl Heuer's avatar
Karl Heuer committed
560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602

;;; Charset property

(defsubst get-charset-property (charset propname)
  "Return the value of CHARSET's PROPNAME property.
This is the last value stored with
`(put-charset-property CHARSET PROPNAME VALUE)'."
  (plist-get (charset-plist charset) propname))

(defsubst put-charset-property (charset propname value)
  "Store CHARSETS's PROPNAME property with value VALUE.
It can be retrieved with `(get-charset-property CHARSET PROPNAME)'."
  (set-charset-plist charset
		     (plist-put (charset-plist charset) propname value)))

;;; Character code property
(put 'char-code-property-table 'char-table-extra-slots 0)

(defvar char-code-property-table
  (make-char-table 'char-code-property-table)
  "Char-table containing a property list of each character code.

See also the documentation of `get-char-code-property' and
`put-char-code-property'")

(defun get-char-code-property (char propname)
  "Return the value of CHAR's PROPNAME property in `char-code-property-table'."
  (let ((plist (aref char-code-property-table char)))
    (if (listp plist)
	(car (cdr (memq propname plist))))))

(defun put-char-code-property (char propname value)
  "Store CHAR's PROPNAME property with VALUE in `char-code-property-table'.
It can be retrieved with `(get-char-code-property CHAR PROPNAME)'."
  (let ((plist (aref char-code-property-table char)))
    (if plist
	(let ((slot (memq propname plist)))
	  (if slot
	      (setcar (cdr slot) value)
	    (nconc plist (list propname value))))
      (aset char-code-property-table char (list propname value)))))

;;; mule-cmds.el ends here