mule-cmds.el 75.4 KB
Newer Older
Karl Heuer's avatar
Karl Heuer committed
1 2 3
;;; mule-cmds.el --- Commands for mulitilingual environment

;; Copyright (C) 1995 Electrotechnical Laboratory, JAPAN.
Richard M. Stallman's avatar
Richard M. Stallman committed
4
;; Licensed to the Free Software Foundation.
Dave Love's avatar
Dave Love committed
5
;; Copyright (C) 2000 Free Software Foundation, Inc.
Karl Heuer's avatar
Karl Heuer committed
6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21

;; 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
22 23 24
;; 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
25 26 27

;;; Code:

Dave Love's avatar
Dave Love committed
28 29
(eval-when-compile (defvar dos-codepage))

Karl Heuer's avatar
Karl Heuer committed
30 31
;;; MULE related key bindings and menus.

Richard M. Stallman's avatar
Richard M. Stallman committed
32
(defvar mule-keymap (make-sparse-keymap)
33
  "Keymap for Mule (Multilingual environment) specific commands.")
Karl Heuer's avatar
Karl Heuer committed
34

35
;; Keep "C-x C-m ..." for mule specific commands.
Richard M. Stallman's avatar
Richard M. Stallman committed
36
(define-key ctl-x-map "\C-m" mule-keymap)
Kenichi Handa's avatar
Kenichi Handa committed
37

Karl Heuer's avatar
Karl Heuer committed
38 39
(define-key mule-keymap "f" 'set-buffer-file-coding-system)
(define-key mule-keymap "t" 'set-terminal-coding-system)
40 41
(define-key mule-keymap "k" 'set-keyboard-coding-system)
(define-key mule-keymap "p" 'set-buffer-process-coding-system)
42 43
(define-key mule-keymap "x" 'set-selection-coding-system)
(define-key mule-keymap "X" 'set-next-selection-coding-system)
44
(define-key mule-keymap "\C-\\" 'set-input-method)
45
(define-key mule-keymap "c" 'universal-coding-system-argument)
46
(define-key mule-keymap "l" 'set-language-environment)
Karl Heuer's avatar
Karl Heuer committed
47

48
(define-key help-map "\C-L" 'describe-language-environment)
49
(define-key help-map "L" 'describe-language-environment)
Karl Heuer's avatar
Karl Heuer committed
50
(define-key help-map "\C-\\" 'describe-input-method)
51
(define-key help-map "I" 'describe-input-method)
52
(define-key help-map "C" 'describe-coding-system)
Karl Heuer's avatar
Karl Heuer committed
53 54
(define-key help-map "h" 'view-hello-file)

Eli Zaretskii's avatar
Eli Zaretskii committed
55 56
(defvar mule-menu-keymap
  (make-sparse-keymap "Mule (Multilingual Environment)")
57
  "Keymap for Mule (Multilingual environment) menu specific commands.")
58

59 60
(defvar describe-language-environment-map
  (make-sparse-keymap "Describe Language Environment"))
61

62 63
(defvar setup-language-environment-map
  (make-sparse-keymap "Set Language Environment"))
64

65 66
(defvar set-coding-system-map
  (make-sparse-keymap "Set Coding System"))
67 68

(define-key-after mule-menu-keymap [set-language-environment]
Dave Love's avatar
Dave Love committed
69 70
  (list 'menu-item  "Set Language Environment" setup-language-environment-map
	:help "Multilingual environment suitable for a specific language"))
71
(define-key-after mule-menu-keymap [mouse-set-font]
Eli Zaretskii's avatar
Eli Zaretskii committed
72
  '(menu-item "Set Font/Fontset" mouse-set-font
Dave Love's avatar
Dave Love committed
73 74
	       :visible (fboundp 'generate-fontset-menu)
	       :help "Select a font from list of known fonts/fontsets"))
75 76 77 78
(define-key-after mule-menu-keymap [separator-mule]
  '("--")
  t)
(define-key-after mule-menu-keymap [toggle-input-method]
Eli Zaretskii's avatar
Eli Zaretskii committed
79
  '(menu-item "Toggle Input Method" toggle-input-method)
80
  t)
81
(define-key-after mule-menu-keymap [set-input-method]
Eli Zaretskii's avatar
Eli Zaretskii committed
82
  '(menu-item "Select Input Method..." set-input-method)
83
  t)
Dave Love's avatar
Dave Love committed
84 85
(define-key-after mule-menu-keymap [describe-input-method]
  '(menu-item "Describe Input Method"  describe-input-method))
86 87 88 89
(define-key-after mule-menu-keymap [separator-input-method]
  '("--")
  t)
(define-key-after mule-menu-keymap [set-various-coding-system]
Dave Love's avatar
Dave Love committed
90 91
  (list 'menu-item "Set Coding Systems" set-coding-system-map
	:enable 'enable-multibyte-characters))
Eli Zaretskii's avatar
Eli Zaretskii committed
92 93 94 95 96
(define-key-after mule-menu-keymap [view-hello-file]
  '(menu-item "Show Multi-lingual Text" view-hello-file
	      :enable (file-readable-p
		       (expand-file-name "HELLO" data-directory))
	      :help "Display file which says HELLO in many languages")
97 98 99 100
  t)
(define-key-after mule-menu-keymap [separator-coding-system]
  '("--")
  t)
Eli Zaretskii's avatar
Eli Zaretskii committed
101 102 103
(define-key-after mule-menu-keymap [describe-language-environment]
  (list 'menu-item "Describe Language Environment"
	describe-language-environment-map
Dave Love's avatar
Dave Love committed
104
	:help "Show multilingual settings for a specific language")
105
  t)
Eli Zaretskii's avatar
Eli Zaretskii committed
106 107
(define-key-after mule-menu-keymap [describe-input-method]
  '(menu-item "Describe Input Method..." describe-input-method
Dave Love's avatar
Dave Love committed
108
	      :help "Keyboard layout for a specific input method")
Eli Zaretskii's avatar
Eli Zaretskii committed
109 110 111 112
  t)
(define-key-after mule-menu-keymap [describe-coding-system]
  '(menu-item "Describe Coding System..." describe-coding-system)
  t)
Dave Love's avatar
Dave Love committed
113 114 115
(define-key-after mule-menu-keymap [list-character-sets]
  '(menu-item "List Character Sets" list-character-sets
	      :help "Show table of available character sets"))
Eli Zaretskii's avatar
Eli Zaretskii committed
116 117 118
(define-key-after mule-menu-keymap [mule-diag]
  '(menu-item "Show All of Mule Status" mule-diag
	      :help "Display multilingual environment settings")
119 120 121
  t)

(define-key-after set-coding-system-map [set-buffer-file-coding-system]
Eli Zaretskii's avatar
Eli Zaretskii committed
122 123
  '(menu-item "For Saving this Buffer" set-buffer-file-coding-system
	      :help "How to encode this buffer on disk")
124
  t)
Richard M. Stallman's avatar
Richard M. Stallman committed
125
(define-key-after set-coding-system-map [universal-coding-system-argument]
Eli Zaretskii's avatar
Eli Zaretskii committed
126 127
  '(menu-item "For Next Command" universal-coding-system-argument
	      :help "Coding system to be used by next command")
Richard M. Stallman's avatar
Richard M. Stallman committed
128
  t)
129
(define-key-after set-coding-system-map [set-terminal-coding-system]
Eli Zaretskii's avatar
Eli Zaretskii committed
130 131 132
  '(menu-item "For Terminal" set-terminal-coding-system
	      :enable (null (memq window-system '(x w32 mac)))
	      :help "How to encode terminal output")
133 134
  t)
(define-key-after set-coding-system-map [set-keyboard-coding-system]
Eli Zaretskii's avatar
Eli Zaretskii committed
135 136
  '(menu-item "For Keyboard" set-keyboard-coding-system
	      :help "How to decode keyboard input")
137 138
  t)
(define-key-after set-coding-system-map [set-buffer-process-coding-system]
Eli Zaretskii's avatar
Eli Zaretskii committed
139 140 141 142
  '(menu-item "For I/O with Subprocess" set-buffer-process-coding-system
	      :visible (fboundp 'start-process)
	      :enable (get-buffer-process (current-buffer))
	      :help "How to en/decode I/O from/to subprocess connected to this buffer")
143
  t)
144
(define-key-after set-coding-system-map [set-selection-coding-system]
Eli Zaretskii's avatar
Eli Zaretskii committed
145 146 147
  '(menu-item "For X Selections/Clipboard" set-selection-coding-system
	      :visible (display-selections-p)
	      :help "How to en/decode data to/from selection/clipboard")
148 149
  t)
(define-key-after set-coding-system-map [set-next-selection-coding-system]
Eli Zaretskii's avatar
Eli Zaretskii committed
150 151 152
  '(menu-item "For Next X Selection" set-next-selection-coding-system
	      :visible (display-selections-p)
	      :help "How to en/decode next selection/clipboard operation")
153
  t)
154
(define-key setup-language-environment-map
Eli Zaretskii's avatar
Eli Zaretskii committed
155
  [Default] '(menu-item "Default" setup-specified-language-environment))
Karl Heuer's avatar
Karl Heuer committed
156

Dave Love's avatar
Dave Love committed
157 158 159
(define-key describe-language-environment-map
  [Default] '(menu-item "Default" describe-specified-language-support))

Karl Heuer's avatar
Karl Heuer committed
160 161 162 163 164 165 166 167
;; 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)

168 169 170 171
;;; This is no good because people often type Shift-SPC
;;; meaning to type SPC.  -- rms.
;;; ;; Here's an alternative key binding for X users (Shift-SPACE).
;;; (define-key global-map [?\S- ] 'toggle-input-method)
172

173 174 175 176 177 178 179 180 181
;;; Mule related hyperlinks.
(defconst help-xref-mule-regexp-template
  (purecopy (concat "\\(\\<\\("
		    "\\(coding system\\)\\|"
		    "\\(input method\\)"
		    "\\)\\s-+\\)?"
		    ;; Note starting with word-syntax character:
		    "`\\(\\sw\\(\\sw\\|\\s_\\)+\\)'")))

182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223
(defun coding-system-change-eol-conversion (coding-system eol-type)
  "Return a coding system which differs from CODING-SYSTEM in eol conversion.
The returned coding system converts end-of-line by EOL-TYPE
but text as the same way as CODING-SYSTEM.
EOL-TYPE should be `unix', `dos', `mac', or nil.
If EOL-TYPE is nil, the returned coding system detects
how end-of-line is formatted automatically while decoding.

EOL-TYPE can be specified by an integer 0, 1, or 2.
They means `unix', `dos', and `mac' respectively."
  (if (symbolp eol-type)
      (setq eol-type (cond ((eq eol-type 'unix) 0)
			   ((eq eol-type 'dos) 1)
			   ((eq eol-type 'mac) 2)
			   (t eol-type))))
  (let ((orig-eol-type (coding-system-eol-type coding-system)))
    (if (vectorp orig-eol-type)
	(if (not eol-type)
	    coding-system
	  (aref orig-eol-type eol-type))
      (let ((base (coding-system-base coding-system)))
	(if (not eol-type)
	    base
	  (if (= eol-type orig-eol-type)
	      coding-system
	    (setq orig-eol-type (coding-system-eol-type base))
	    (if (vectorp orig-eol-type)
		(aref orig-eol-type eol-type))))))))

(defun coding-system-change-text-conversion (coding-system coding)
  "Return a coding system which differs from CODING-SYSTEM in text conversion.
The returned coding system converts text by CODING
but end-of-line as the same way as CODING-SYSTEM.
If CODING is nil, the returned coding system detects
how text is formatted automatically while decoding."
  (if (not coding)
      (coding-system-base coding-system)
    (let ((eol-type (coding-system-eol-type coding-system)))
      (coding-system-change-eol-conversion
       coding
       (if (numberp eol-type) (aref [unix dos mac] eol-type))))))

Karl Heuer's avatar
Karl Heuer committed
224
(defun toggle-enable-multibyte-characters (&optional arg)
225 226 227 228 229 230 231 232 233 234 235
  "Change whether this buffer uses multibyte characters.
With arg, use multibyte characters if the arg is positive.

Note that this command does not convert the byte contents of
the buffer; it only changes the way those bytes are interpreted.
In general, therefore, this command *changes* the sequence of
characters that the current buffer contains.

We suggest you avoid using use this command unless you know what you
are doing.  If you use it by mistake, and the buffer is now displayed
wrong, use this command again to toggle back to the right mode."
Karl Heuer's avatar
Karl Heuer committed
236
  (interactive "P")
237 238 239 240
  (let ((new-flag
	 (if (null arg) (null enable-multibyte-characters)
	   (> (prefix-numeric-value arg) 0))))
    (set-buffer-multibyte new-flag))
Karl Heuer's avatar
Karl Heuer committed
241 242 243 244 245
  (force-mode-line-update))

(defun view-hello-file ()
  "Display the HELLO file which list up many languages and characters."
  (interactive)
246 247
  ;; We have to decode the file in any environment.
  (let ((default-enable-multibyte-characters t)
248
	(coding-system-for-read 'iso-2022-7bit))
249
    (find-file-read-only (expand-file-name "HELLO" data-directory))))
Karl Heuer's avatar
Karl Heuer committed
250

251 252 253
(defun universal-coding-system-argument ()
  "Execute an I/O command using the specified coding system."
  (interactive)
254 255 256 257 258 259 260 261 262
  (let* ((default (and buffer-file-coding-system
		       (not (eq (coding-system-type buffer-file-coding-system)
				t))
		       buffer-file-coding-system))
	 (coding-system (read-coding-system
			 (if default
			     (format "Coding system for following command (default, %s): " default)
			   "Coding system for following command: ")
			 default))
263
	 (keyseq (read-key-sequence
264
		  (format "Command to execute with %s:" coding-system)))
265 266 267 268 269 270
	 (cmd (key-binding keyseq)))
    (let ((coding-system-for-read coding-system)
	  (coding-system-for-write coding-system))
      (message "")
      (call-interactively cmd))))

271
(defun set-default-coding-systems (coding-system)
Kenichi Handa's avatar
Kenichi Handa committed
272
  "Set default value of various coding systems to CODING-SYSTEM.
273
This sets the following coding systems:
Kenichi Handa's avatar
Kenichi Handa committed
274
  o coding system of a newly created buffer
Kenichi Handa's avatar
Kenichi Handa committed
275 276
  o default coding system for subprocess I/O
This also sets the following values:
277
  o default value used as file-name-coding-system for converting file names.
278 279
  o default value for the command `set-terminal-coding-system' (not on MSDOS)
  o default value for the command `set-keyboard-coding-system'."
280 281
  (check-coding-system coding-system)
  (setq-default buffer-file-coding-system coding-system)
282 283
  (if default-enable-multibyte-characters
      (setq default-file-name-coding-system coding-system))
284 285 286 287
  ;; If coding-system is nil, honor that on MS-DOS as well, so
  ;; that they could reset the terminal coding system.
  (unless (and (eq window-system 'pc) coding-system)
    (setq default-terminal-coding-system coding-system))
288 289 290
  (setq default-keyboard-coding-system coding-system)
  (setq default-process-coding-system (cons coding-system coding-system)))

291
(defalias 'update-iso-coding-systems 'update-coding-systems-internal)
292
(make-obsolete 'update-iso-coding-systems 'update-coding-systems-internal "20.3")
293

Kenichi Handa's avatar
Kenichi Handa committed
294 295
(defun prefer-coding-system (coding-system)
  "Add CODING-SYSTEM at the front of the priority list for automatic detection.
296
This also sets the following coding systems:
Kenichi Handa's avatar
Kenichi Handa committed
297
  o coding system of a newly created buffer
Kenichi Handa's avatar
Kenichi Handa committed
298 299
  o default coding system for subprocess I/O
This also sets the following values:
300
  o default value used as file-name-coding-system for converting file names.
301 302 303
  o default value for the command `set-terminal-coding-system' (not on MSDOS)
  o default value for the command `set-keyboard-coding-system'

304 305 306
If CODING-SYSTEM specifies a certain type of EOL conversion, the coding
systems set by this function will use that type of EOL conversion.

307 308 309 310
This command does not change the default value of terminal coding system
for MS-DOS terminal, because DOS terminals only support a single coding
system, and Emacs automatically sets the default to that coding system at
startup."
Kenichi Handa's avatar
Kenichi Handa committed
311 312 313 314
  (interactive "zPrefer coding system: ")
  (if (not (and coding-system (coding-system-p coding-system)))
      (error "Invalid coding system `%s'" coding-system))
  (let ((coding-category (coding-system-category coding-system))
315 316
	(base (coding-system-base coding-system))
	(eol-type (coding-system-eol-type coding-system)))
Kenichi Handa's avatar
Kenichi Handa committed
317 318 319
    (if (not coding-category)
	;; CODING-SYSTEM is no-conversion or undecided.
	(error "Can't prefer the coding system `%s'" coding-system))
Kenichi Handa's avatar
Kenichi Handa committed
320
    (set coding-category (or base coding-system))
321
    (update-coding-systems-internal)
322
    (or (eq coding-category (car coding-category-list))
Kenichi Handa's avatar
Kenichi Handa committed
323
	;; We must change the order.
324
	(set-coding-priority (list coding-category)))
Kenichi Handa's avatar
Kenichi Handa committed
325 326 327
    (if (and base (interactive-p))
	(message "Highest priority is set to %s (base of %s)"
		 base coding-system))
328
    ;; If they asked for specific EOL conversion, honor that.
329
    (if (memq eol-type '(0 1 2))
330 331 332 333
	(setq coding-system
	      (coding-system-change-eol-conversion base eol-type))
      (setq coding-system base))
    (set-default-coding-systems coding-system)))
Kenichi Handa's avatar
Kenichi Handa committed
334

335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385
(defvar sort-coding-systems-predicate nil
  "If non-nil, a predicate function to sort coding systems.

It is called with two coding systems, and should return t if the first
one is \"less\" than the second.

The function `sort-coding-systems' use it.")

(defun sort-coding-systems (codings)
  "Sort coding system list CODINGS by a priority of each coding system.

If a coding system is most preferred, it has the highest priority.
Otherwise, a coding system corresponds to some MIME charset has higher
priorities.  Among them, a coding system included in `coding-system'
key of the current language environment has higher priorities.  See
also the documentation of `language-info-alist'.

If the variable `sort-coding-systems-predicate' (which see) is
non-nil, it is used to sort CODINGS in the different way than above."
  (if sort-coding-systems-predicate
      (sort codings sort-coding-systems-predicate)
    (let* ((most-preferred (symbol-value (car coding-category-list)))
	   (lang-preferred (get-language-info current-language-environment
					      'coding-system))
	   (func (function
		  (lambda (x)
		    (let ((base (coding-system-base x)))
		      (+ (if (eq base most-preferred) 64 0)
			 (let ((mime (coding-system-get base 'mime-charset)))
			   (if mime
			       (if (string-match "^x-" (symbol-name mime))
				   16 32)
			     0))
			 (if (memq base lang-preferred) 8 0)
			 (if (string-match "-with-esc$" (symbol-name base))
			     0 4)
			 (if (eq (coding-system-type base) 2)
			     ;; For ISO based coding systems, prefer
			     ;; one that doesn't use escape sequences.
			     (let ((flags (coding-system-flags base)))
			       (if (or (consp (aref flags 0))
				       (consp (aref flags 1))
				       (consp (aref flags 2))
				       (consp (aref flags 3)))
				   (if (or (aref flags 8) (aref flags 9))
				       0
				     1)
				 2))
			   1)))))))
      (sort codings (function (lambda (x y)
				(> (funcall func x) (funcall func y))))))))
386

Kenichi Handa's avatar
Kenichi Handa committed
387
(defun find-coding-systems-region (from to)
388 389 390 391
  "Return a list of proper coding systems to encode a text between FROM and TO.
All coding systems in the list can safely encode any multibyte characters
in the text.

Karl Heuer's avatar
Karl Heuer committed
392
If the text contains no multibyte characters, return a list of a single
Kenichi Handa's avatar
Kenichi Handa committed
393
element `undecided'."
394 395 396 397 398 399 400
  (let ((codings (find-coding-systems-region-internal from to)))
    (if (eq codings t)
	;; The text contains only ASCII characters.  Any coding
	;; systems are safe.
	'(undecided)
      ;; We need copy-sequence because sorting will alter the argument.
      (sort-coding-systems (copy-sequence codings)))))
401

Kenichi Handa's avatar
Kenichi Handa committed
402 403 404 405 406
(defun find-coding-systems-string (string)
  "Return a list of proper coding systems to encode STRING.
All coding systems in the list can safely encode any multibyte characters
in STRING.

Karl Heuer's avatar
Karl Heuer committed
407
If STRING contains no multibyte characters, return a list of a single
Kenichi Handa's avatar
Kenichi Handa committed
408
element `undecided'."
409
  (find-coding-systems-region string nil))
Kenichi Handa's avatar
Kenichi Handa committed
410 411 412 413

(defun find-coding-systems-for-charsets (charsets)
  "Return a list of proper coding systems to encode characters of CHARSETS.
CHARSETS is a list of character sets."
414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437
  (cond ((or (null charsets)
	     (and (= (length charsets) 1)
		  (eq 'ascii (car charsets))))
	 '(undecided))
	((or (memq 'eight-bit-control charsets)
	     (memq 'eight-bit-graphic charsets))
	 '(raw-text emacs-mule))
	(t
	 (let ((codings t)
	       charset l ll)
	   (while (and codings charsets)
	     (setq charset (car charsets) charsets (cdr charsets))
	     (unless (eq charset 'ascii)
	       (setq l (aref char-coding-system-table (make-char charset)))
	       (if (eq codings t)
		   (setq codings l)
		 (let ((ll nil))
		   (while codings
		     (if (memq (car codings) l)
			 (setq ll (cons (car codings) ll)))
		     (setq codings (cdr codings)))
		   (setq codings ll)))))
	   (append codings
		   (char-table-extra-slot char-coding-system-table 0))))))
438

439 440 441 442 443 444 445 446 447 448
(defun find-multibyte-characters (from to &optional maxcount excludes)
  "Find multibyte characters in the region specified by FROM and TO.
If FROM is a string, find multibyte characters in the string.
The return value is an alist of the following format:
  ((CHARSET COUNT CHAR ...) ...)
where
  CHARSET is a character set,
  COUNT is a number of characters,
  CHARs are found characters of the character set.
Optional 3rd arg MAXCOUNT limits how many CHARs are put in the above list.
449 450 451
Optional 4th arg EXCLUDE is a list of character sets to be ignored.

For invalid characters, CHARs are actually strings."
452 453 454 455 456 457 458
  (let ((chars nil)
	charset char)
    (if (stringp from)
	(let ((idx 0))
	  (while (setq idx (string-match "[^\000-\177]" from idx))
	    (setq char (aref from idx)
		  charset (char-charset char))
459 460
	    (if (eq charset 'unknown)
		(setq char (match-string 0)))
461 462
	    (if (or (memq charset '(unknown
				    eight-bit-control eight-bit-graphic))
463
		    (not (or (eq excludes t) (memq charset excludes))))
464 465 466 467 468 469 470 471 472 473 474 475 476 477
		(let ((slot (assq charset chars)))
		  (if slot
		      (if (not (memq char (nthcdr 2 slot)))
			  (let ((count (nth 1 slot)))
			    (setcar (cdr slot) (1+ count))
			    (if (or (not maxcount) (< count maxcount))
				(nconc slot (list char)))))
		    (setq chars (cons (list charset 1 char) chars)))))
	    (setq idx (1+ idx))))
      (save-excursion
	(goto-char from)
	(while (re-search-forward "[^\000-\177]" to t)
	  (setq char (preceding-char)
		charset (char-charset char))
478 479
	  (if (eq charset 'unknown)
	      (setq char (match-string 0)))
480
	  (if (or (memq charset '(unknown eight-bit-control eight-bit-graphic))
481
		  (not (or (eq excludes t) (memq charset excludes))))
482 483
	      (let ((slot (assq charset chars)))
		(if slot
484
		    (if (not (member char (nthcdr 2 slot)))
485 486 487 488 489 490 491
			(let ((count (nth 1 slot)))
			  (setcar (cdr slot) (1+ count))
			  (if (or (not maxcount) (< count maxcount))
			      (nconc slot (list char)))))
		  (setq chars (cons (list charset 1 char) chars))))))))
    (nreverse chars)))

492 493 494 495 496 497 498
(defvar last-coding-system-specified nil
  "Most recent coding system explicitly specified by the user when asked.
This variable is set whenever Emacs asks the user which coding system
to use in order to write a file.  If you set it to nil explicitly,
then call `write-region', then afterward this variable will be non-nil
only if the user was explicitly asked and specified a coding system.")

499 500 501 502 503 504 505 506
(defvar select-safe-coding-system-accept-default-p nil
  "If non-nil, a function to control the behaviour of coding system selection.
The meaning is the same as the argument ACCEPT-DEFAULT-P of the
function `select-safe-coding-system' (which see).  This variable
overrides that argument.")

(defun select-safe-coding-system (from to &optional default-coding-system
				       accept-default-p)
507 508
  "Ask a user to select a safe coding system from candidates.
The candidates of coding systems which can safely encode a text
509 510 511 512 513 514 515 516
between FROM and TO are shown in a popup window.  Among them, the most
proper one is suggested as the default.

The list of `buffer-file-coding-system' of the current buffer and the
most preferred coding system (if it corresponds to a MIME charset) is
treated as the default coding system list.  Among them, the first one
that safely encodes the text is silently selected and returned without
any user interaction.  See also the command `prefer-coding-system'.
517

518 519 520
Optional 3rd arg DEFAULT-CODING-SYSTEM specifies a coding system or a
list of coding systems to be prepended to the default coding system
list.
521

522 523 524 525 526 527 528
Optional 4th arg ACCEPT-DEFAULT-P, if non-nil, is a function to
determine the acceptability of the silently selected coding system.
It is called with that coding system, and should return nil if it
should not be silently selected and thus user interaction is required.

The variable `select-safe-coding-system-accept-default-p', if
non-nil, overrides ACCEPT-DEFAULT-P.
529 530 531

Kludgy feature: if FROM is a string, the string is the target text,
and TO is ignored."
532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547
  (if (and default-coding-system
	   (not (listp default-coding-system)))
      (setq default-coding-system (list default-coding-system)))

  ;; Change elements of the list to (coding . base-coding).
  (setq default-coding-system
	(mapcar (function (lambda (x) (cons x (coding-system-base x))))
		default-coding-system))

  ;; If buffer-file-coding-system is not nil nor undecided, append it
  ;; to the defaults.
  (if buffer-file-coding-system
      (let ((base (coding-system-base buffer-file-coding-system)))
	(or (eq base 'undecided)
	    (assq buffer-file-coding-system default-coding-system)
	    (rassq base default-coding-system)
Dave Love's avatar
Dave Love committed
548
	    (setq default-coding-system
549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581
		  (append default-coding-system
			  (list (cons buffer-file-coding-system base)))))))

  ;; If the most preferred coding system has the property mime-charset,
  ;; append it to the defaults.
  (let* ((preferred (symbol-value (car coding-category-list)))
	 (base (coding-system-base preferred)))
    (and (coding-system-get preferred 'mime-charset)
	 (not (assq preferred default-coding-system))
	 (not (rassq base default-coding-system))
	 (setq default-coding-system
	       (append default-coding-system (list (cons preferred base))))))

  (if select-safe-coding-system-accept-default-p
      (setq accept-default-p select-safe-coding-system-accept-default-p))

  (let ((codings (find-coding-systems-region from to))
	(coding-system nil)
	(l default-coding-system))
    (if (eq (car codings) 'undecided)
	;; Any coding system is ok.
	(setq coding-system t)
      ;; Try the defaults.
      (while (and l (not coding-system))
	(if (memq (cdr (car l)) codings)
	    (setq coding-system (car (car l)))
	  (setq l (cdr l))))
      (if (and coding-system accept-default-p)
	  (or (funcall accept-default-p coding-system)
	      (setq coding-system (list coding-system)))))

    ;; If all the defaults failed, ask a user.
    (when (or (not coding-system) (consp coding-system))
582
      ;; At first, change each coding system to the corresponding
583 584 585
      ;; mime-charset name if it is also a coding system.  Such a name
      ;; is more friendly to users.
      (let ((l codings)
586 587 588 589 590 591 592
	    mime-charset)
	(while l
	  (setq mime-charset (coding-system-get (car l) 'mime-charset))
	  (if (and mime-charset (coding-system-p mime-charset))
	      (setcar l mime-charset))
	  (setq l (cdr l))))

593 594 595 596 597 598
      ;; Then ask users to select one form CODINGS.
      (unwind-protect
	  (save-window-excursion
	    (with-output-to-temp-buffer "*Warning*"
	      (save-excursion
		(set-buffer standard-output)
599
		(insert "The following default coding systems were tried:\n")
600 601 602 603 604 605
		(let ((pos (point))
		      (fill-prefix "  "))
		  (mapcar (function (lambda (x) (princ "  ") (princ (car x))))
			  default-coding-system)
		  (insert "\n")
		  (fill-region-as-paragraph pos (point)))
606 607 608 609 610 611 612
		(insert
		 (if (consp coding-system)
		     (concat (format "%s safely encodes the target text,\n"
				     (car coding-system))
			     "but it is not recommended for encoding text in this context,\n"
			     "e.g., for sending an email message.\n")
		   "However, none of them safely encodes the target text.\n"))
613
		(insert (if (consp coding-system)
614 615 616
			    "\nSelect the above, or "
			  "\nSelect ")
			"one of the following safe coding systems:\n")
617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645
		(let ((pos (point))
		      (fill-prefix "  "))
		  (mapcar (function (lambda (x) (princ "  ") (princ x)))
			  codings)
		  (insert "\n")
		  (fill-region-as-paragraph pos (point)))))

	    ;; Read a coding system.
	    (if (consp coding-system)
		(setq codings (cons (car coding-system) codings)))
	    (let* ((safe-names (mapcar (lambda (x) (list (symbol-name x)))
				       codings))
		   (name (completing-read
			  (format "Select coding system (default %s): "
				  (car codings))
			  safe-names nil t nil nil
			  (car (car safe-names)))))
	      (setq last-coding-system-specified (intern name)
		    coding-system last-coding-system-specified)))
	(kill-buffer "*Warning*")))

    (if (vectorp (coding-system-eol-type coding-system))
	(let ((eol (coding-system-eol-type buffer-file-coding-system)))
	  (if (numberp eol)
	      (setq coding-system
		    (coding-system-change-eol-conversion coding-system eol)))))

    (if (eq coding-system t)
	(setq coding-system buffer-file-coding-system))
Dave Love's avatar
Dave Love committed
646
    coding-system))
647 648 649

(setq select-safe-coding-system-function 'select-safe-coding-system)

650 651 652 653 654 655
(defun select-message-coding-system ()
  "Return a coding system to encode the outgoing message of the current buffer.
It at first tries the first coding system found in these variables
in this order:
  (1) local value of `buffer-file-coding-system'
  (2) value of `sendmail-coding-system'
656 657
  (3) value of `default-sendmail-coding-system'
  (4) value of `default-buffer-file-coding-system'
658 659
If the found coding system can't encode the current buffer,
or none of them are bound to a coding system,
660
it asks the user to select a proper coding system."
661
  (let ((coding (or (and (local-variable-p 'buffer-file-coding-system)
662 663 664 665
			  buffer-file-coding-system)
		     sendmail-coding-system
		     default-sendmail-coding-system
		     default-buffer-file-coding-system)))
666 667 668 669 670
    (if (eq coding 'no-conversion)
	;; We should never use no-conversion for outgoing mails.
	(setq coding nil))
    (if (fboundp select-safe-coding-system-function)
	(funcall select-safe-coding-system-function
671 672
		 (point-min) (point-max) coding
		 (function (lambda (x) (coding-system-get x 'mime-charset))))
673
      coding)))
Karl Heuer's avatar
Karl Heuer committed
674

675
;;; Language support stuff.
Karl Heuer's avatar
Karl Heuer committed
676 677

(defvar language-info-alist nil
Richard M. Stallman's avatar
Richard M. Stallman committed
678
  "Alist of language environment definitions.
Karl Heuer's avatar
Karl Heuer committed
679 680
Each element looks like:
	(LANGUAGE-NAME . ((KEY . INFO) ...))
Richard M. Stallman's avatar
Richard M. Stallman committed
681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703
where LANGUAGE-NAME is a string, the name of the language environment,
KEY is a symbol denoting the kind of information, and
INFO is the data associated with KEY.
Meaningful values for KEY include

  documentation      value is documentation of what this language environment
			is meant for, and how to use it.
  charset	     value is a list of the character sets used by this
			language environment.
  sample-text	     value is one line of text,
			written using those character sets,
			appropriate for this language environment.
  setup-function     value is a function to call to switch to this
			language environment.
  exit-function      value is a function to call to leave this
		        language environment.
  coding-system      value is a list of coding systems that are good
			for saving text written in this language environment.
			This list serves as suggestions to the user;
			in effect, as a kind of documentation.
  coding-priority    value is a list of coding systems for this language
			environment, in order of decreasing priority.
			This is used to set up the coding system priority
704
			list when you switch to this language environment.
705
  nonascii-translation
706
		     value is a translation table to be set in the
707
			variable `nonascii-translation-table' in this
708 709
			language environment, or a character set from
			which `nonascii-insert-offset' is calculated.
710 711
  input-method       value is a default input method for this language
			environment.
712 713
  features           value is a list of features requested in this
			language environment.
714 715 716 717 718 719

The following keys take effect only when multibyte characters are
globally disabled, i.e. the value of `default-enable-multibyte-characters'
is nil.

  unibyte-syntax     value is a library name to load to set
Karl Heuer's avatar
Karl Heuer committed
720
			unibyte 8-bit character syntaxes for this
721 722 723 724 725 726 727
			language environment.

  unibyte-display    value is a coding system to encode characters
			for the terminal.  Characters in the range
			of 160 to 255 display not as octal escapes,
			but as non-ASCII characters in this language
			environment.")
Richard M. Stallman's avatar
Richard M. Stallman committed
728 729 730 731 732 733 734 735 736

(defun get-language-info (lang-env key)
  "Return information listed under KEY for language environment LANG-ENV.
KEY is a symbol denoting the kind of information.
For a list of useful values for KEY and their meanings,
see `language-info-alist'."
  (if (symbolp lang-env)
      (setq lang-env (symbol-name lang-env)))
  (let ((lang-slot (assoc-ignore-case lang-env language-info-alist)))
Karl Heuer's avatar
Karl Heuer committed
737 738 739
    (if lang-slot
	(cdr (assq key (cdr lang-slot))))))

740
(defun set-language-info (lang-env key info)
Richard M. Stallman's avatar
Richard M. Stallman committed
741 742 743
  "Modify part of the definition of language environment LANG-ENV.
Specifically, this stores the information INFO under KEY
in the definition of this language environment.
Karl Heuer's avatar
Karl Heuer committed
744
KEY is a symbol denoting the kind of information.
Richard M. Stallman's avatar
Richard M. Stallman committed
745
INFO is the value for that information.
746

Richard M. Stallman's avatar
Richard M. Stallman committed
747
For a list of useful values for KEY and their meanings,
748
see `language-info-alist'."
Richard M. Stallman's avatar
Richard M. Stallman committed
749 750
  (if (symbolp lang-env)
      (setq lang-env (symbol-name lang-env)))
Karl Heuer's avatar
Karl Heuer committed
751
  (let (lang-slot key-slot)
Richard M. Stallman's avatar
Richard M. Stallman committed
752
    (setq lang-slot (assoc lang-env language-info-alist))
Karl Heuer's avatar
Karl Heuer committed
753
    (if (null lang-slot)		; If no slot for the language, add it.
Richard M. Stallman's avatar
Richard M. Stallman committed
754
	(setq lang-slot (list lang-env)
Karl Heuer's avatar
Karl Heuer committed
755 756 757 758 759 760
	      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)))))
Dave Love's avatar
Dave Love committed
761
    (setcdr key-slot (purecopy info))))
Karl Heuer's avatar
Karl Heuer committed
762

Richard M. Stallman's avatar
Richard M. Stallman committed
763 764 765
(defun set-language-info-alist (lang-env alist &optional parents)
  "Store ALIST as the definition of language environment LANG-ENV.
ALIST is an alist of KEY and INFO values.  See the documentation of
766
`language-info-alist' for the meanings of KEY and INFO.
767

Richard M. Stallman's avatar
Richard M. Stallman committed
768 769 770 771 772 773 774
Optional arg PARENTS is a list of parent menu names; it specifies
where to put this language environment in the 
Describe Language Environment and Set Language Environment menus.
For example, (\"European\") means to put this language environment
in the European submenu in each of those two menus."
  (if (symbolp lang-env)
      (setq lang-env (symbol-name lang-env)))
775 776 777 778
  (let ((describe-map describe-language-environment-map)
	(setup-map setup-language-environment-map))
    (if parents
	(let ((l parents)
779
	      map parent-symbol parent prompt)
780 781 782 783 784
	  (while l
	    (if (symbolp (setq parent-symbol (car l)))
		(setq parent (symbol-name parent))
	      (setq parent parent-symbol parent-symbol (intern parent)))
	    (setq map (lookup-key describe-map (vector parent-symbol)))
785 786 787
	    ;; This prompt string is for define-prefix-command, so
	    ;; that the map it creates will be suitable for a menu.
	    (or map (setq prompt (format "%s Environment" parent)))
788 789 790 791
	    (if (not map)
		(progn
		  (setq map (intern (format "describe-%s-environment-map"
					    (downcase parent))))
792
		  (define-prefix-command map nil prompt)
793 794 795 796 797 798 799 800
		  (define-key-after describe-map (vector parent-symbol)
		    (cons parent map) t)))
	    (setq describe-map (symbol-value map))
	    (setq map (lookup-key setup-map (vector parent-symbol)))
	    (if (not map)
		(progn
		  (setq map (intern (format "setup-%s-environment-map"
					    (downcase parent))))
801
		  (define-prefix-command map nil prompt)
802 803 804 805
		  (define-key-after setup-map (vector parent-symbol)
		    (cons parent map) t)))
	    (setq setup-map (symbol-value map))
	    (setq l (cdr l)))))
806 807

    ;; Set up menu items for this language env.
808
    (let ((doc (assq 'documentation alist)))
809 810
      (when doc
	(define-key-after describe-map (vector (intern lang-env))
811 812 813
	  (cons lang-env 'describe-specified-language-support) t)))
    (define-key-after setup-map (vector (intern lang-env))
      (cons lang-env 'setup-specified-language-environment) t)
814

815
    (while alist
816
      (set-language-info lang-env (car (car alist)) (cdr (car alist)))
817
      (setq alist (cdr alist)))))
Karl Heuer's avatar
Karl Heuer committed
818

819
(defun read-language-name (key prompt &optional default)
Richard M. Stallman's avatar
Richard M. Stallman committed
820
  "Read a language environment name which has information for KEY.
821
If KEY is nil, read any language environment.
Richard M. Stallman's avatar
Richard M. Stallman committed
822 823
Prompt with PROMPT.  DEFAULT is the default choice of language environment.
This returns a language environment name as a string."
Karl Heuer's avatar
Karl Heuer committed
824 825 826
  (let* ((completion-ignore-case t)
	 (name (completing-read prompt
				language-info-alist
827 828
				(and key
				     (function (lambda (elm) (assq key elm))))
829
				t nil nil default)))
830
    (if (and (> (length name) 0)
831 832
	     (or (not key)
		 (get-language-info name key)))
833
	name)))
Karl Heuer's avatar
Karl Heuer committed
834 835 836

;;; Multilingual input methods.

837 838 839 840 841 842
(defconst leim-list-file-name "leim-list.el"
  "Name of LEIM list file.
This file contains a list of libraries of Emacs input methods (LEIM)
in the format of Lisp expression for registering each input method.
Emacs loads this file at startup time.")

843 844
(defvar leim-list-header (format
";;; %s -- list of LEIM (Library of Emacs Input Method)
845 846
;;
;; This file contains a list of LEIM (Library of Emacs Input Method)
Karl Heuer's avatar
Karl Heuer committed
847
;; in the same directory as this file.  Loading this file registers
848 849
;; the whole input methods in Emacs.
;;
Kenichi Handa's avatar
Kenichi Handa committed
850
;; Each entry has the form:
851 852 853 854 855 856 857 858 859 860 861 862 863
;;   (register-input-method
;;    INPUT-METHOD LANGUAGE-NAME ACTIVATE-FUNC
;;    TITLE DESCRIPTION
;;    ARG ...)
;; See the function `register-input-method' for the meanings of arguments.
;;
;; If this directory is included in load-path, Emacs automatically
;; loads this file at startup time.

"
				 leim-list-file-name)
  "Header to be inserted in LEIM list file.")

864
(defvar leim-list-entry-regexp "^(register-input-method"
865 866 867 868 869 870 871 872
  "Regexp matching head of each entry in LEIM list file.
See also the variable `leim-list-header'")

(defvar update-leim-list-functions
  '(quail-update-leim-list-file)
  "List of functions to call to update LEIM list file.
Each function is called with one arg, LEIM directory name.")

873 874
(defun update-leim-list-file (&rest dirs)
  "Update LEIM list file in directories DIRS."
875 876
  (let ((functions update-leim-list-functions))
    (while functions
877
      (apply (car functions) dirs)
878 879
      (setq functions (cdr functions)))))

Karl Heuer's avatar
Karl Heuer committed
880 881
(defvar current-input-method nil
  "The current input method for multilingual text.
882
If nil, that means no input method is activated now.")
Karl Heuer's avatar
Karl Heuer committed
883 884 885 886
(make-variable-buffer-local 'current-input-method)
(put 'current-input-method 'permanent-local t)

(defvar current-input-method-title nil
887
  "Title string of the current input method shown in mode line.")
Karl Heuer's avatar
Karl Heuer committed
888 889 890
(make-variable-buffer-local 'current-input-method-title)
(put 'current-input-method-title 'permanent-local t)

891
(defcustom default-input-method nil
892
  "*Default input method for multilingual text (a string).
893
This is the input method activated automatically by the command
Richard M. Stallman's avatar
Richard M. Stallman committed
894
`toggle-input-method' (\\[toggle-input-method])."
895
  :group 'mule
896 897
  :type '(choice (const nil) string)
  :set-after '(current-language-environment))
898

899 900
(put 'input-method-function 'permanent-local t)

Kenichi Handa's avatar
Kenichi Handa committed
901 902 903 904
(defvar input-method-history nil
  "History list for some commands that read input methods.")
(make-variable-buffer-local 'input-method-history)
(put 'input-method-history 'permanent-local t)
Karl Heuer's avatar
Karl Heuer committed
905 906 907 908

(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.
909 910 911 912
This function is called with no argument.

This function should never change the value of `current-input-method'.
It is set to nil by the function `inactivate-input-method'.")
Karl Heuer's avatar
Karl Heuer committed
913 914 915 916 917 918 919 920 921
(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)

922
(defvar input-method-alist nil
Richard M. Stallman's avatar
Richard M. Stallman committed
923
  "Alist of input method names vs how to use them.
924
Each element has the form:
Richard M. Stallman's avatar
Richard M. Stallman committed
925 926 927
   (INPUT-METHOD LANGUAGE-ENV ACTIVATE-FUNC TITLE DESCRIPTION ARGS...)
See the function `register-input-method' for the meanings of the elements.")

928
(defun register-input-method (input-method lang-env &rest args)
Richard M. Stallman's avatar
Richard M. Stallman committed
929
  "Register INPUT-METHOD as an input method for language environment ENV.
930
INPUT-METHOD and LANG-ENV are symbols or strings.
931 932

The remaining arguments are:
Richard M. Stallman's avatar
Richard M. Stallman committed
933 934 935 936 937
	ACTIVATE-FUNC, TITLE, DESCRIPTION, and ARGS...
ACTIVATE-FUNC is a function to call to activate this method.
TITLE is a string to show in the mode line when this method is active.
DESCRIPTION is a string describing this method and what it is good for.
The ARGS, if any, are passed as arguments to ACTIVATE-FUNC.
938 939 940 941 942 943 944 945 946 947 948 949 950 951
All told, the arguments to ACTIVATE-FUNC are INPUT-METHOD and the ARGS.

This function is mainly used in the file \"leim-list.el\" which is
created at building time of emacs, registering all quail input methods
contained in the emacs distribution.

In case you want to register a new quail input method by yourself, be
careful to use the same input method title as given in the third
parameter of `quail-define-package' (if the values are different, the
string specified in this function takes precedence).

The commands `describe-input-method' and `list-input-methods' need
this duplicated values to show some information about input methods
without loading the affected quail packages."
952 953
  (if (symbolp lang-env)
      (setq lang-env (symbol-name lang-env)))
954 955
  (if (symbolp input-method)
      (setq input-method (symbol-name input-method)))
956
  (let ((info (cons lang-env args))
957 958 959 960 961 962
	(slot (assoc input-method input-method-alist)))
    (if slot
	(setcdr slot info)
      (setq slot (cons input-method info))
      (setq input-method-alist (cons slot input-method-alist)))))

963
(defun read-input-method-name (prompt &optional default inhibit-null)
964
  "Read a name of input method from a minibuffer prompting with PROMPT.
965 966
If DEFAULT is non-nil, use that as the default,
  and substitute it into PROMPT at the first `%s'.
967 968 969
If INHIBIT-NULL is non-nil, null input signals an error.

The return value is a string."
970 971
  (if default
      (setq prompt (format prompt default)))
972
  (let* ((completion-ignore-case t)
Kenichi Handa's avatar
Kenichi Handa committed
973 974
	 ;; This binding is necessary because input-method-history is
	 ;; buffer local.
975
	 (input-method (completing-read prompt input-method-alist
976 977
					nil t nil 'input-method-history
					default)))
978 979
    (if (and input-method (symbolp input-method))
	(setq input-method (symbol-name input-method)))
980 981 982
    (if (> (length input-method) 0)
	input-method
      (if inhibit-null
983
	  (error "No valid input method is specified")))))
984 985

(defun activate-input-method (input-method)
Richard M. Stallman's avatar
Richard M. Stallman committed
986 987 988
  "Switch to input method INPUT-METHOD for the current buffer.
If some other input method is already active, turn it off first.
If INPUT-METHOD is nil, deactivate any current input method."
989
  (if (and input-method (symbolp input-method))
990
      (setq input-method (symbol-name input-method)))
Kenichi Handa's avatar
Kenichi Handa committed
991 992
  (if (and current-input-method
	   (not (string= current-input-method input-method)))
993
      (inactivate-input-method))
Richard M. Stallman's avatar
Richard M. Stallman committed
994
  (unless (or current-input-method (null input-method))
995 996
    (let ((slot (assoc input-method input-method-alist)))
      (if (null slot)
Kenichi Handa's avatar
Kenichi Handa committed
997
	  (error "Can't activate input method `%s'" input-method))
Kenichi Handa's avatar
Kenichi Handa committed
998 999 1000 1001 1002 1003 1004 1005
      (let ((func (nth 2 slot)))
	(if (functionp func)
	    (apply (nth 2 slot) input-method (nthcdr 5 slot))
	  (if (and (consp func) (symbolp (car func)) (symbolp (cdr func)))
	      (progn
		(require (cdr func))
		(apply (car func) input-method (nthcdr 5 slot)))
	    (error "Can't activate input method `%s'" input-method))))
1006
      (setq current-input-method input-method)
Kenichi Handa's avatar
Kenichi Handa committed
1007
      (setq current-input-method-title (nth 3 slot))
1008 1009 1010
      (unwind-protect
	  (run-hooks 'input-method-activate-hook)
	(force-mode-line-update)))))
1011 1012

(defun inactivate-input-method ()
1013
  "Turn off the current input method."
Kenichi Handa's avatar
Kenichi Handa committed
1014 1015 1016 1017 1018 1019 1020 1021 1022
  (when current-input-method
    (if input-method-history
	(unless (string= current-input-method (car input-method-history))
	  (setq input-method-history
		(cons current-input-method
		      (delete current-input-method input-method-history))))
      (setq input-method-history (list current-input-method)))
    (unwind-protect
	(funcall inactivate-current-input-method-function)
1023
      (unwind-protect
Kenichi Handa's avatar
Kenichi Handa committed
1024 1025
	  (run-hooks 'input-method-inactivate-hook)
	(setq current-input-method nil
1026 1027
	      current-input-method-title nil)
	(force-mode-line-update)))))
Karl Heuer's avatar
Karl Heuer committed
1028

1029
(defun set-input-method (input-method)
Richard M. Stallman's avatar
Richard M. Stallman committed
1030 1031
  "Select and activate input method INPUT-METHOD for the current buffer.
This also sets the default input method to the one you specify."