mime-view.el

   1 ;;; mime-view.el --- interactive MIME viewer for GNU Emacs
   2
   3 ;; Copyright (C) 1995,1996,1997,1998,1999 Free Software Foundation, Inc.
   4
   5 ;; Author: MORIOKA Tomohiko <morioka@jaist.ac.jp>
   6 ;; Created: 1994/07/13
   7 ;;      Renamed: 1994/08/31 from tm-body.el
   8 ;;      Renamed: 1997/02/19 from tm-view.el
   9 ;; Keywords: MIME, multimedia, mail, news
  10
  11 ;; This file is part of SEMI (Sample of Elastic MIME Interfaces).
  12
  13 ;; This program is free software; you can redistribute it and/or
  14 ;; modify it under the terms of the GNU General Public License as
  15 ;; published by the Free Software Foundation; either version 2, or (at
  16 ;; your option) any later version.
  17
  18 ;; This program is distributed in the hope that it will be useful, but
  19 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
  20 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  21 ;; General Public License for more details.
  22
  23 ;; You should have received a copy of the GNU General Public License
  24 ;; along with GNU Emacs; see the file COPYING.  If not, write to the
  25 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  26 ;; Boston, MA 02111-1307, USA.
  27
  28 ;;; Code:
  29
  30 (require 'emu)
  31 (require 'mime)
  32 (require 'semi-def)
  33 (require 'calist)
  34 (require 'alist)
  35 (require 'mailcap)
  36
  37
  38 ;;; @ version
  39 ;;;
  40
  41 (defconst mime-view-version
  42   (concat (mime-product-name mime-user-interface-product) " MIME-View "
  43           (mapconcat #'number-to-string
  44                      (mime-product-version mime-user-interface-product) ".")
  45           " (" (mime-product-code-name mime-user-interface-product) ")"))
  46
  47
  48 ;;; @ variables
  49 ;;;
  50
  51 (defgroup mime-view nil
  52   "MIME view mode"
  53   :group 'mime)
  54
  55 (defcustom mime-view-find-every-acting-situation t
  56   "*Find every available acting-situation if non-nil."
  57   :group 'mime-view
  58   :type 'boolean)
  59
  60 (defcustom mime-acting-situation-examples-file "~/.mime-example"
  61   "*File name of example about acting-situation demonstrated by user."
  62   :group 'mime-view
  63   :type 'file)
  64
  65 (defcustom mime-preview-move-scroll nil
  66   "*Decides whether to scroll when moving to next entity.
  67 When t, scroll the buffer.  Non-nil but not t means scroll when
  68 the next entity is within `next-screen-context-lines' from top or
  69 buttom.  Nil means don't scroll at all."
  70   :group 'mime-view
  71   :type '(choice (const :tag "Off" nil)
  72                  (const :tag "On" t)
  73                  (sexp :tag "Situation" 1)))
  74
  75 (defcustom mime-preview-scroll-full-screen nil
  76   "*When non-nil, always scroll full screen.
  77 If nil, point will be moved to the next entity if exists."
  78   :group 'mime-view
  79   :type '(choice (const :tag "On" t)
  80                  (const :tag "Off" nil)))
  81
  82 (defcustom mime-view-force-inline-types '(text multipart)
  83   "*List of MIME types that \"attachment\" should be ignored.
  84 The element can be type or type/subtype. When t, inline everything
  85 if possible."
  86   :group 'mime-view
  87   :type '(choice (const :tag "Nothing" nil)
  88                  (const :tag "All" t)
  89                  (list (repeat symbol))))
  90
  91 (defcustom mime-view-button-place-alist
  92   '((message . around)
  93     (application . before)
  94     (multipart/alternative . around))
  95   "*Alist of MIME type or type/subtype vs. button place.
  96 When around, button will be inserted before and after that part.
  97 When after or before, button will be inserted that place.
  98 If not specified, that type will not have button."
  99   :group 'mime-view
 100   :type '(choice (const :tag "Nothing" nil)
 101                  (list (repeat symbol))))
 102
 103 ;; Rename this.
 104 (defcustom mime-view-type-subtype-score-alist
 105   '(((text . enriched) . 3)
 106     ((text . richtext) . 2)
 107     ((text . plain)    . 1)
 108     (t . 0))
 109   "Alist MEDIA-TYPE vs corresponding score.
 110 MEDIA-TYPE must be (TYPE . SUBTYPE), TYPE or t.  t means default."
 111   :group 'mime-view
 112   :type '(repeat (cons (choice :tag "Media-Type"
 113                                (cons :tag "Type/Subtype"
 114                                      (symbol :tag "Primary-type")
 115                                      (symbol :tag "Subtype"))
 116                                (symbol :tag "Type")
 117                                (const :tag "Default" t))
 118                        integer)))
 119
 120 (defvar mime-view-automatic-conversion
 121   (cond ((featurep 'xemacs)
 122          'automatic-conversion)
 123         ((boundp 'MULE)
 124          '*autoconv*)
 125         (t
 126          'undecided)))
 127
 128 ;;; @ in raw-buffer (representation space)
 129 ;;;
 130
 131 (defvar mime-preview-buffer nil
 132   "MIME-preview buffer corresponding with the (raw) buffer.")
 133 (make-variable-buffer-local 'mime-preview-buffer)
 134
 135
 136 (defvar mime-raw-representation-type-alist
 137   '((mime-show-message-mode     . binary)
 138     (mime-temp-message-mode     . binary)
 139     (t                          . cooked))
 140   "Alist of `major-mode' vs. representation-type of mime-raw-buffer.
 141 Each element looks like (SYMBOL . REPRESENTATION-TYPE).  SYMBOL is
 142 `major-mode' or t.  t means default.  REPRESENTATION-TYPE must be
 143 `binary' or `cooked'.")
 144
 145
 146 ;; (defun mime-raw-find-entity-from-point (point &optional message-info)
 147 ;;   "Return entity from POINT in mime-raw-buffer.
 148 ;; If optional argument MESSAGE-INFO is not specified,
 149 ;; `mime-message-structure' is used."
 150 ;;   (or message-info
 151 ;;       (setq message-info mime-message-structure))
 152 ;;   (if (and (<= (mime-entity-point-min message-info) point)
 153 ;;            (<= point (mime-entity-point-max message-info)))
 154 ;;       (let ((children (mime-entity-children message-info)))
 155 ;;         (catch 'tag
 156 ;;           (while children
 157 ;;             (let ((ret
 158 ;;                    (mime-raw-find-entity-from-point point (car children))))
 159 ;;               (if ret
 160 ;;                   (throw 'tag ret)
 161 ;;                 ))
 162 ;;             (setq children (cdr children)))
 163 ;;           message-info))))
 164 ;; (make-obsolete 'mime-raw-find-entity-from-point "don't use it.")
 165
 166
 167 ;;; @ in preview-buffer (presentation space)
 168 ;;;
 169
 170 (defvar mime-mother-buffer nil
 171   "Mother buffer corresponding with the (MIME-preview) buffer.
 172 If current MIME-preview buffer is generated by other buffer, such as
 173 message/partial, it is called `mother-buffer'.")
 174 (make-variable-buffer-local 'mime-mother-buffer)
 175
 176 ;; (defvar mime-raw-buffer nil
 177 ;;   "Raw buffer corresponding with the (MIME-preview) buffer.")
 178 ;; (make-variable-buffer-local 'mime-raw-buffer)
 179
 180 (defvar mime-preview-original-window-configuration nil
 181   "Window-configuration before `mime-view-mode' is called.")
 182 (make-variable-buffer-local 'mime-preview-original-window-configuration)
 183
 184 (defun mime-preview-original-major-mode (&optional recursive point)
 185   "Return major-mode of original buffer.
 186 If optional argument RECURSIVE is non-nil and current buffer has
 187 mime-mother-buffer, it returns original major-mode of the
 188 mother-buffer."
 189   (if (and recursive mime-mother-buffer)
 190       (save-excursion
 191         (set-buffer mime-mother-buffer)
 192         (mime-preview-original-major-mode recursive))
 193     (cdr (assq 'major-mode
 194                (get-text-property (or point
 195                                       (if (> (point) (buffer-size))
 196                                           (max (1- (point-max)) (point-min))
 197                                         (point)))
 198                                   'mime-view-situation)))))
 199
 200
 201 ;;; @ entity information
 202 ;;;
 203
 204 (defun mime-entity-situation (entity &optional situation)
 205   "Return situation of ENTITY."
 206   (let (rest param name)
 207     ;; Content-Type
 208     (unless (assq 'type situation)
 209       (setq rest (or (mime-entity-content-type entity)
 210                      (make-mime-content-type 'text 'plain))
 211             situation (cons (car rest) situation)
 212             rest (cdr rest)))
 213     (unless (assq 'subtype situation)
 214       (or rest
 215           (setq rest (or (cdr (mime-entity-content-type entity))
 216                          '((subtype . plain)))))
 217       (setq situation (cons (car rest) situation)
 218             rest (cdr rest)))
 219     (while rest
 220       (setq param (car rest))
 221       (or (assoc (car param) situation)
 222           (setq situation (cons param situation)))
 223       (setq rest (cdr rest)))
 224
 225     ;; Content-Disposition
 226     (setq rest nil)
 227     (unless (assq 'disposition-type situation)
 228       (setq rest (mime-entity-content-disposition entity))
 229       (if rest
 230           (setq situation (cons (cons 'disposition-type
 231                                       (mime-content-disposition-type rest))
 232                                 situation)
 233                 rest (mime-content-disposition-parameters rest))))
 234     (while rest
 235       (setq param (car rest)
 236             name (car param))
 237       (if (cond ((string= name "filename")
 238                  (if (assq 'filename situation)
 239                      nil
 240                    (setq name 'filename)))
 241                 ((string= name "creation-date")
 242                  (if (assq 'creation-date situation)
 243                      nil
 244                    (setq name 'creation-date)))
 245                 ((string= name "modification-date")
 246                  (if (assq 'modification-date situation)
 247                      nil
 248                    (setq name 'modification-date)))
 249                 ((string= name "read-date")
 250                  (if (assq 'read-date situation)
 251                      nil
 252                    (setq name 'read-date)))
 253                 ((string= name "size")
 254                  (if (assq 'size situation)
 255                      nil
 256                    (setq name 'size)))
 257                 (t (setq name (cons 'disposition name))
 258                    (if (assoc name situation)
 259                        nil
 260                      name)))
 261           (setq situation
 262                 (cons (cons name (cdr param))
 263                       situation)))
 264       (setq rest (cdr rest)))
 265
 266     ;; Content-Transfer-Encoding
 267     (or (assq 'encoding situation)
 268         (setq situation
 269               (cons (cons 'encoding (or (mime-entity-encoding entity)
 270                                         "7bit"))
 271                     situation)))
 272
 273     situation))
 274
 275 (defun mime-view-entity-title (entity)
 276   (or (mime-entity-read-field entity 'Content-Description)
 277       (mime-entity-read-field entity 'Subject)
 278       (mime-entity-filename entity)
 279       ""))
 280
 281
 282 ;; (defsubst mime-raw-point-to-entity-node-id (point &optional message-info)
 283 ;;   "Return entity-node-id from POINT in mime-raw-buffer.
 284 ;; If optional argument MESSAGE-INFO is not specified,
 285 ;; `mime-message-structure' is used."
 286 ;;   (mime-entity-node-id (mime-raw-find-entity-from-point point message-info)))
 287
 288 ;; (make-obsolete 'mime-raw-point-to-entity-node-id "don't use it.")
 289
 290 ;; (defsubst mime-raw-point-to-entity-number (point &optional message-info)
 291 ;;   "Return entity-number from POINT in mime-raw-buffer.
 292 ;; If optional argument MESSAGE-INFO is not specified,
 293 ;; `mime-message-structure' is used."
 294 ;;   (mime-entity-number (mime-raw-find-entity-from-point point message-info)))
 295
 296 ;; (make-obsolete 'mime-raw-point-to-entity-number "don't use it.")
 297
 298 ;; (defun mime-raw-flatten-message-info (&optional message-info)
 299 ;;   "Return list of entity in mime-raw-buffer.
 300 ;; If optional argument MESSAGE-INFO is not specified,
 301 ;; `mime-message-structure' is used."
 302 ;;   (or message-info
 303 ;;       (setq message-info mime-message-structure))
 304 ;;   (let ((dest (list message-info))
 305 ;;         (rcl (mime-entity-children message-info)))
 306 ;;     (while rcl
 307 ;;       (setq dest (nconc dest (mime-raw-flatten-message-info (car rcl))))
 308 ;;       (setq rcl (cdr rcl)))
 309 ;;     dest))
 310
 311 (defmacro mime-view-header-is-visible (situation)
 312   `(eq (cdr (or (assq '*header ,situation)
 313                 (assq 'header ,situation)))
 314        'visible))
 315
 316 (defmacro mime-view-body-is-visible (situation)
 317   `(eq (cdr (or (assq '*body ,situation)
 318                 (assq 'body ,situation)))
 319        'visible))
 320
 321 (defmacro mime-view-children-is-invisible (situation)
 322   `(eq (cdr (or (assq '*children ,situation)
 323                 (assq 'children ,situation)))
 324        'invisible))
 325
 326 (defmacro mime-view-button-is-visible (situation)
 327   ;; Kludge.
 328   `(or (eq (or (cdr (assq '*entity-button ,situation))
 329                (cdr (assq 'entity-button ,situation)))
 330            'visible)
 331        (and (not (eq (or (cdr (assq '*entity-button ,situation))
 332                          (cdr (assq 'entity-button ,situation)))
 333                      'invisible))
 334             (mime-view-entity-button-visible-p entity))))
 335
 336 ;;; @ presentation of preview
 337 ;;;
 338
 339 ;;; @@ entity-button
 340 ;;;
 341
 342 ;;; @@@ predicate function
 343 ;;;
 344
 345 ;; #### fix flim
 346 (defun mime-view-entity-type/subtype (entity)
 347   (if (not (mime-entity-media-type entity))
 348       'text/plain
 349     (intern (format "%s/%s"
 350                     (mime-entity-media-type entity)
 351                     (mime-entity-media-subtype entity)))))
 352
 353 (defun mime-view-entity-button-visible-p (entity)
 354   "Return non-nil if header of ENTITY is visible.
 355 You can customize the visibility by changing `mime-view-button-place-alist'."
 356   (or
 357    ;; Check current entity
 358    ;; type/subtype
 359    (memq (cdr (assq (mime-view-entity-type/subtype entity)
 360                     mime-view-button-place-alist))
 361          '(around before))
 362    ;; type
 363    (memq (cdr (assq (mime-entity-media-type entity)
 364                     mime-view-button-place-alist))
 365          '(around before))
 366    (and (mime-entity-parent entity)
 367         (let ((prev-entity
 368                (cadr (memq entity
 369                            (reverse (mime-entity-children
 370                                      (mime-entity-parent entity)))))))
 371           ;; When previous entity exists
 372           (and prev-entity
 373                (or
 374                 ;; Check previous entity
 375                 ;; type/subtype
 376                 (memq (cdr
 377                        (assq
 378                         (mime-view-entity-type/subtype prev-entity)
 379                         mime-view-button-place-alist))
 380                       '(around after))
 381                 ;; type
 382                 (memq (cdr
 383                        (assq
 384                         (mime-entity-media-type prev-entity)
 385                         mime-view-button-place-alist))
 386                       '(around after))))))
 387    ;; default for everything.
 388    (memq (cdr (assq t
 389                     mime-view-button-place-alist))
 390          '(around before))))
 391
 392 ;;; @@@ entity button generator
 393 ;;;
 394
 395 (defun mime-view-insert-entity-button (entity &optional body-is-invisible)
 396   "Insert entity-button of ENTITY."
 397   (let ((entity-node-id (mime-entity-node-id entity))
 398         (params (mime-entity-parameters entity))
 399         (subject (mime-view-entity-title entity)))
 400     (mime-insert-button
 401      (concat
 402       (let ((access-type (assoc "access-type" params))
 403             (num (or (cdr (assoc "x-part-number" params))
 404                      (if (consp entity-node-id)
 405                          (mapconcat (function
 406                                      (lambda (num)
 407                                        (format "%s" (1+ num))))
 408                                     (reverse entity-node-id) ".")
 409                        "0"))))
 410         (cond (access-type
 411                (let ((server (assoc "server" params)))
 412                  (setq access-type (cdr access-type))
 413                  (if server
 414                      (format "%s %s ([%s] %s)"
 415                              num subject access-type (cdr server))
 416                    (let ((site (cdr (assoc "site" params)))
 417                          (dir (cdr (assoc "directory" params)))
 418                          (url (cdr (assoc "url" params))))
 419                      (if url
 420                          (format "%s %s ([%s] %s)"
 421                                  num subject access-type url)
 422                        (format "%s %s ([%s] %s:%s)"
 423                                num subject access-type site dir))))))
 424               (t
 425                (let ((media-type (mime-entity-media-type entity))
 426                      (media-subtype (mime-entity-media-subtype entity))
 427                      (charset (cdr (assoc "charset" params)))
 428                      (encoding (mime-entity-encoding entity)))
 429                  (concat
 430                   num " " subject
 431                   (let ((rest
 432                          (format " <%s/%s%s%s>"
 433                                  media-type media-subtype
 434                                  (if charset
 435                                      (concat "; " charset)
 436                                    "")
 437                                  (if encoding
 438                                      (concat " (" encoding ")")
 439                                    ""))))
 440                     (if (>= (+ (current-column)(length rest))(window-width))
 441                         "\n\t")
 442                     rest))))))
 443       (if body-is-invisible
 444           " ..."
 445         ""))
 446      (function mime-preview-play-current-entity))))
 447
 448
 449 ;;; @@ entity-header
 450 ;;;
 451
 452 (defvar mime-header-presentation-method-alist nil
 453   "Alist of major mode vs. corresponding header-presentation-method functions.
 454 Each element looks like (SYMBOL . FUNCTION).
 455 SYMBOL must be major mode in raw-buffer or t.  t means default.
 456 Interface of FUNCTION must be (ENTITY SITUATION).")
 457
 458 (defvar mime-view-ignored-field-list
 459   '(".*Received:" ".*Path:" ".*Id:" "^References:"
 460     "^Replied:" "^Errors-To:"
 461     "^Lines:" "^Sender:" ".*Host:" "^Xref:"
 462     "^Content-Type:" "^Precedence:"
 463     "^Status:" "^X-VM-.*:")
 464   "All fields that match this list will be hidden in MIME preview buffer.
 465 Each elements are regexp of field-name.")
 466
 467 (defvar mime-view-visible-field-list '("^Dnas.*:" "^Message-Id:")
 468   "All fields that match this list will be displayed in MIME preview buffer.
 469 Each elements are regexp of field-name.")
 470
 471
 472 ;;; @@ entity-body
 473 ;;;
 474
 475 ;;; @@@ predicate function
 476 ;;;
 477
 478 (in-calist-package 'mime-view)
 479
 480 (defun mime-calist::field-match-method-as-default-rule (calist
 481                                                         field-type field-value)
 482   (let ((s-field (assq field-type calist)))
 483     (cond ((null s-field)
 484            (cons (cons field-type field-value) calist))
 485           (t calist))))
 486
 487 (define-calist-field-match-method
 488   'header #'mime-calist::field-match-method-as-default-rule)
 489
 490 (define-calist-field-match-method
 491   'body #'mime-calist::field-match-method-as-default-rule)
 492
 493
 494 (defvar mime-preview-condition nil
 495   "Condition-tree about how to display entity.")
 496
 497 ;;(ctree-set-calist-strictly
 498 ;; 'mime-preview-condition '((type . application)(subtype . octet-stream)
 499 ;;                         (encoding . nil)
 500 ;;                         (body . visible)))
 501
 502 (ctree-set-calist-strictly
 503  'mime-preview-condition '((type . application)(subtype . t)
 504                            (encoding . "7bit")
 505                            (body . visible)))
 506 (ctree-set-calist-strictly
 507  'mime-preview-condition '((type . application)(subtype . t)
 508                            (encoding . "8bit")
 509                            (body . visible)))
 510
 511 (ctree-set-calist-strictly
 512  'mime-preview-condition '((type . application)(subtype . pgp)
 513                            (body . visible)))
 514
 515 (ctree-set-calist-strictly
 516  'mime-preview-condition '((type . application)(subtype . x-latex)
 517                            (body . visible)))
 518
 519 (ctree-set-calist-strictly
 520  'mime-preview-condition '((type . application)(subtype . x-selection)
 521                            (body . visible)))
 522
 523 (ctree-set-calist-strictly
 524  'mime-preview-condition '((type . application)(subtype . x-comment)
 525                            (body . visible)))
 526
 527 (ctree-set-calist-strictly
 528  'mime-preview-condition '((type . message)(subtype . delivery-status)
 529                            (body . visible)))
 530
 531 (ctree-set-calist-strictly
 532  'mime-preview-condition
 533  '((body . visible)
 534    (body-presentation-method . mime-display-text/plain)))
 535
 536 (ctree-set-calist-strictly
 537  'mime-preview-condition
 538  '((type . nil)
 539    (body . visible)
 540    (body-presentation-method . mime-display-text/plain)))
 541
 542 (ctree-set-calist-strictly
 543  'mime-preview-condition
 544  '((type . text)(subtype . enriched)
 545    (body . visible)
 546    (body-presentation-method . mime-display-text/enriched)))
 547
 548 (ctree-set-calist-strictly
 549  'mime-preview-condition
 550  '((type . text)(subtype . richtext)
 551    (body . visible)
 552    (body-presentation-method . mime-display-text/richtext)))
 553
 554 (ctree-set-calist-strictly
 555  'mime-preview-condition
 556  '((type . application)(subtype . x-postpet)
 557    (body . visible)
 558    (body-presentation-method . mime-display-application/x-postpet)))
 559
 560 (ctree-set-calist-strictly
 561  'mime-preview-condition '((type . application)(subtype . t)
 562                            (encoding . t)
 563                            (body . invisible)
 564                            (body-presentation-method . mime-display-detect-application/octet-stream)))
 565
 566 (ctree-set-calist-strictly
 567  'mime-preview-condition
 568  '((type . text)(subtype . t)
 569    (body . visible)
 570    (body-presentation-method . mime-display-text/plain)))
 571
 572 (ctree-set-calist-strictly
 573  'mime-preview-condition
 574  '((type . text)(subtype . x-rot13-47-48)
 575    (body . visible)
 576    (body-presentation-method . mime-display-text/x-rot13-47-48)))
 577
 578 (ctree-set-calist-strictly
 579  'mime-preview-condition
 580  '((type . multipart)(subtype . alternative)
 581    (body . visible)
 582    (body-presentation-method . mime-display-multipart/alternative)))
 583
 584 (ctree-set-calist-strictly
 585  'mime-preview-condition
 586  '((type . multipart)(subtype . t)
 587    (body . visible)
 588    (body-presentation-method . mime-display-multipart/mixed)))
 589
 590 (ctree-set-calist-strictly
 591  'mime-preview-condition
 592  '((type . message)(subtype . partial)
 593    (body . visible)
 594    (body-presentation-method . mime-display-message/partial-button)))
 595
 596 (ctree-set-calist-strictly
 597  'mime-preview-condition
 598  '((type . message)(subtype . rfc822)
 599    (body . visible)
 600    (body-presentation-method . mime-display-multipart/mixed)
 601    (childrens-situation (header . visible)
 602                         (entity-button . invisible))))
 603
 604 (ctree-set-calist-strictly
 605  'mime-preview-condition
 606  '((type . message)(subtype . news)
 607    (body . visible)
 608    (body-presentation-method . mime-display-multipart/mixed)
 609    (childrens-situation (header . visible)
 610                         (entity-button . invisible))))
 611
 612 ;; message/external-body has only one child.
 613 (ctree-set-calist-strictly
 614  'mime-preview-condition
 615  '((type . message)(subtype . external-body)
 616    (body . visible)
 617    (body-presentation-method . nil)
 618    (childrens-situation (header . invisible)
 619                         (body . invisible)
 620                         (entity-button . visible))))
 621
 622
 623 ;;; @@@ entity presentation
 624 ;;;
 625
 626 (defun mime-display-text/plain (entity situation)
 627   (save-restriction
 628     (narrow-to-region (point-max)(point-max))
 629     (mime-insert-text-content entity)
 630     (run-hooks 'mime-text-decode-hook)
 631     (goto-char (point-max))
 632     (if (not (eq (char-after (1- (point))) ?\n))
 633         (insert "\n"))
 634     (mime-add-url-buttons)
 635     (run-hooks 'mime-display-text/plain-hook)))
 636
 637 (defun mime-display-text (entity situation)
 638   (save-restriction
 639     (narrow-to-region (point-max) (point-max))
 640     (insert
 641      (decode-coding-string
 642       (mime-decode-string
 643        (if (fboundp 'mime-entity-body)
 644            ;; FLIM 1.14
 645            (mime-entity-body entity)
 646          ;; #### This is wrong, but...
 647          (mime-entity-content entity))
 648        (or (cdr (assq 'encoding situation))
 649            (if (fboundp 'mime-entity-body)
 650                (mime-entity-encoding entity)
 651              "7bit")))
 652       (or (cdr (assq 'coding situation))
 653           'binary)))))
 654
 655 (defun mime-display-text/richtext (entity situation)
 656   (save-restriction
 657     (narrow-to-region (point-max)(point-max))
 658     (mime-insert-text-content entity)
 659     (run-hooks 'mime-text-decode-hook)
 660     (let ((beg (point-min)))
 661       (remove-text-properties beg (point-max) '(face nil))
 662       (richtext-decode beg (point-max)))))
 663
 664 (defun mime-display-text/enriched (entity situation)
 665   (save-restriction
 666     (narrow-to-region (point-max)(point-max))
 667     (mime-insert-text-content entity)
 668     (run-hooks 'mime-text-decode-hook)
 669     (let ((beg (point-min)))
 670       (remove-text-properties beg (point-max) '(face nil))
 671       (enriched-decode beg (point-max)))))
 672
 673 (defun mime-display-text/x-rot13-47-48 (entity situation)
 674   (save-restriction
 675     (narrow-to-region (point-max)(point-max))
 676     (mime-insert-text-content entity)
 677     (goto-char (point-max))
 678     (if (not (eq (char-after (1- (point))) ?\n))
 679         (insert "\n"))
 680     (mule-caesar-region (point-min) (point-max))
 681     (mime-add-url-buttons)))
 682
 683 (put 'unpack 'lisp-indent-function 1)
 684 (defmacro unpack (string &rest body)
 685   `(let* ((*unpack*string* (string-as-unibyte ,string))
 686           (*unpack*index* 0))
 687      ,@body))
 688
 689 (defun unpack-skip (len)
 690   (setq *unpack*index* (+ len *unpack*index*)))
 691
 692 (defun unpack-fixed (len)
 693   (prog1
 694       (substring *unpack*string* *unpack*index* (+ *unpack*index* len))
 695     (unpack-skip len)))
 696
 697 (defun unpack-byte ()
 698   (char-int (aref (unpack-fixed 1) 0)))
 699
 700 (defun unpack-short ()
 701   (let* ((b0 (unpack-byte))
 702          (b1 (unpack-byte)))
 703     (+ (* 256 b0) b1)))
 704
 705 (defun unpack-long ()
 706   (let* ((s0 (unpack-short))
 707          (s1 (unpack-short)))
 708     (+ (* 65536 s0) s1)))
 709
 710 (defun unpack-string ()
 711   (let ((len (unpack-byte)))
 712     (unpack-fixed len)))
 713
 714 (defun unpack-string-sjis ()
 715   (decode-mime-charset-string (unpack-string) 'shift_jis))
 716
 717 (defun postpet-decode (string)
 718   (condition-case nil
 719       (unpack string
 720         (let (res)
 721           (unpack-skip 4)
 722           (set-alist 'res 'carryingcount (unpack-long))
 723           (unpack-skip 8)
 724           (set-alist 'res 'sentyear (unpack-short))
 725           (set-alist 'res 'sentmonth (unpack-short))
 726           (set-alist 'res 'sentday (unpack-short))
 727           (unpack-skip 8)
 728           (set-alist 'res 'petname (unpack-string-sjis))
 729           (set-alist 'res 'owner (unpack-string-sjis))
 730           (set-alist 'res 'pettype (unpack-fixed 4))
 731           (set-alist 'res 'health (unpack-short))
 732           (unpack-skip 2)
 733           (set-alist 'res 'sex (unpack-long))
 734           (unpack-skip 1)
 735           (set-alist 'res 'brain (unpack-byte))
 736           (unpack-skip 39)
 737           (set-alist 'res 'happiness (unpack-byte))
 738           (unpack-skip 14)
 739           (set-alist 'res 'petbirthyear (unpack-short))
 740           (set-alist 'res 'petbirthmonth (unpack-short))
 741           (set-alist 'res 'petbirthday (unpack-short))
 742           (unpack-skip 8)
 743           (set-alist 'res 'from (unpack-string))
 744           (unpack-skip 5)
 745           (unpack-skip 160)
 746           (unpack-skip 4)
 747           (unpack-skip 8)
 748           (unpack-skip 8)
 749           (unpack-skip 26)
 750           (set-alist 'res 'treasure (unpack-short))
 751           (set-alist 'res 'money (unpack-long))
 752           res))
 753     (error nil)))
 754
 755 (defun mime-display-application/x-postpet (entity situation)
 756   (save-restriction
 757     (narrow-to-region (point-max)(point-max))
 758     (let ((pet (postpet-decode (mime-entity-content entity))))
 759       (if pet
 760           (insert "Petname: " (cdr (assq 'petname pet)) "\n"
 761                   "Owner: " (cdr (assq 'owner pet)) "\n"
 762                   "Pettype: " (cdr (assq 'pettype pet)) "\n"
 763                   "From: " (cdr (assq 'from pet)) "\n"
 764                   "CarryingCount: " (int-to-string (cdr (assq 'carryingcount pet))) "\n"
 765                   "SentYear: " (int-to-string (cdr (assq 'sentyear pet))) "\n"
 766                   "SentMonth: " (int-to-string (cdr (assq 'sentmonth pet))) "\n"
 767                   "SentDay: " (int-to-string (cdr (assq 'sentday pet))) "\n"
 768                   "PetbirthYear: " (int-to-string (cdr (assq 'petbirthyear pet))) "\n"
 769                   "PetbirthMonth: " (int-to-string (cdr (assq 'petbirthmonth pet))) "\n"
 770                   "PetbirthDay: " (int-to-string (cdr (assq 'petbirthday pet))) "\n"
 771                   "Health: " (int-to-string (cdr (assq 'health pet))) "\n"
 772                   "Sex: " (int-to-string (cdr (assq 'sex pet))) "\n"
 773                   "Brain: " (int-to-string (cdr (assq 'brain pet))) "\n"
 774                   "Happiness: " (int-to-string (cdr (assq 'happiness pet))) "\n"
 775                   "Treasure: " (int-to-string (cdr (assq 'treasure pet))) "\n"
 776                   "Money: " (int-to-string (cdr (assq 'money pet))) "\n")
 777         (insert "Invalid format\n"))
 778       (run-hooks 'mime-display-application/x-postpet-hook))))
 779
 780
 781 (defvar mime-view-announcement-for-message/partial
 782   (if (and (>= emacs-major-version 19) window-system)
 783       "\
 784 \[[ This is message/partial style split message. ]]
 785 \[[ Please press `v' key in this buffer          ]]
 786 \[[ or click here by mouse button-2.             ]]"
 787     "\
 788 \[[ This is message/partial style split message. ]]
 789 \[[ Please press `v' key in this buffer.         ]]"))
 790
 791 (defun mime-display-message/partial-button (&optional entity situation)
 792   (save-restriction
 793     (goto-char (point-max))
 794     (if (not (search-backward "\n\n" nil t))
 795         (insert "\n"))
 796     (goto-char (point-max))
 797     (narrow-to-region (point-max)(point-max))
 798     (insert mime-view-announcement-for-message/partial)
 799     (mime-add-button (point-min)(point-max)
 800                      #'mime-preview-play-current-entity)))
 801
 802 (defun mime-display-multipart/mixed (entity situation)
 803   (let ((children (mime-entity-children entity))
 804         (original-major-mode-cell (assq 'major-mode situation))
 805         (default-situation
 806           (cdr (assq 'childrens-situation situation))))
 807     (if original-major-mode-cell
 808         (setq default-situation
 809               (cons original-major-mode-cell default-situation)))
 810     (while children
 811       (mime-display-entity (car children) nil default-situation)
 812       (setq children (cdr children)))))
 813
 814 (defun mime-display-multipart/alternative (entity situation)
 815   (let* ((children (mime-entity-children entity))
 816          (original-major-mode-cell (assq 'major-mode situation))
 817          (default-situation
 818            (cdr (assq 'childrens-situation situation)))
 819          (i 0)
 820          (p 0)
 821          (max-score 0)
 822          situations)
 823     (if original-major-mode-cell
 824         (setq default-situation
 825               (cons original-major-mode-cell default-situation)))
 826     (setq situations
 827           (mapcar (function
 828                    (lambda (child)
 829                      (let ((situation
 830                             (or (ctree-match-calist
 831                                  mime-preview-condition
 832                                  (append (mime-entity-situation child)
 833                                          default-situation))
 834                                 default-situation)))
 835                        (if (cdr (assq 'body-presentation-method situation))
 836                            (let ((score
 837                                   (cdr
 838                                    (or (assoc
 839                                         (cons
 840                                          (cdr (assq 'type situation))
 841                                          (cdr (assq 'subtype situation)))
 842                                         mime-view-type-subtype-score-alist)
 843                                        (assq
 844                                         (cdr (assq 'type situation))
 845                                         mime-view-type-subtype-score-alist)
 846                                        (assq
 847                                         t
 848                                         mime-view-type-subtype-score-alist)))))
 849                              (if (> score max-score)
 850                                  (setq p i
 851                                        max-score score))))
 852                        (setq i (1+ i))
 853                        situation)))
 854                   children))
 855     (setq i 0)
 856     (while children
 857       (let ((child (car children))
 858             (situation (car situations)))
 859         (mime-display-entity child (if (= i p)
 860                                        situation
 861                                      (del-alist 'body-presentation-method
 862                                                 (copy-alist situation)))))
 863       (setq children (cdr children)
 864             situations (cdr situations)
 865             i (1+ i)))))
 866
 867 (defun mime-display-detect-application/octet-stream (entity situation)
 868   "Detect unknown ENTITY and display it inline.
 869 This can only handle gzipped contents."
 870   (or (and (mime-entity-filename entity)
 871            (string-match "\\.gz$" (mime-entity-filename entity))
 872            (mime-display-gzipped entity situation))
 873       (mime-display-text/plain entity situation)))
 874
 875 (defun mime-display-gzipped (entity situation)
 876   "Ungzip gzipped part and display."
 877     (insert
 878      (decode-coding-string
 879       (with-temp-buffer
 880         ;; #### Kludge to make FSF Emacs happy.
 881         (if (featurep 'xemacs)
 882             (insert (mime-entity-content entity))
 883           (let ((content (mime-entity-content entity)))
 884             (if (not (multibyte-string-p content))
 885                 ;; I really hate this brain-damaged function.
 886                 (set-buffer-multibyte nil))
 887             (insert content)))
 888         (as-binary-process
 889          (call-process-region (point-min) (point-max) "gzip" t t
 890                               nil "-cd"))
 891         ;; Oh my goodness.
 892         (when (fboundp 'set-buffer-multibyte)
 893           (set-buffer-multibyte t))
 894         (buffer-string))
 895       mime-view-automatic-conversion))
 896      t)
 897
 898 (defun mime-preview-inline ()
 899   "View part as text without code conversion."
 900   (interactive)
 901   (let ((inhibit-read-only t)
 902         (entity (get-text-property (point) 'mime-view-entity))
 903         (situation (get-text-property (point) 'mime-view-situation))
 904         start)
 905     (when (and entity
 906                (not (get-text-property (point) 'mime-view-entity-header))
 907                (not (memq (mime-entity-media-type entity)
 908                           '(multipart message))))
 909       (setq start (or (and (not (mime-entity-parent entity))
 910                            (1+ (previous-single-property-change
 911                                 (point)
 912                                 'mime-view-entity-header)))
 913                       (and (not (eq (point) (point-min)))
 914                            (not (eq (get-text-property (1- (point))
 915                                                        'mime-view-entity)
 916                                     entity))
 917                            (point))
 918                       (previous-single-property-change (point)
 919                                                    'mime-view-entity)
 920                       (point)))
 921       (delete-region start
 922                      (1-
 923                       (or (next-single-property-change (point)
 924                                                        'mime-view-entity)
 925                           (point-max))))
 926       (setq start (point))
 927       (if (mime-view-entity-button-visible-p entity)
 928           (mime-view-insert-entity-button entity))
 929       (insert (mime-entity-content entity))
 930       (if (and (bolp) (eolp))
 931           (delete-char 1)
 932         (forward-char 1))
 933       (add-text-properties start (point)
 934                            (list 'mime-view-entity entity
 935                                  'mime-view-situation situation))
 936       (goto-char start))))
 937
 938 (defun mime-preview-text (&optional ask-coding)
 939   "View part as text. MIME charset will be guessed automatically.
 940 With prefix, it prompts for coding-system."
 941   (interactive "P")
 942   (let ((inhibit-read-only t)
 943         (mime-view-force-inline-types t)
 944         (position (mime-preview-entity-boundary))
 945         (coding (if ask-coding
 946                     (or (read-coding-system "Coding system: ")
 947                         mime-view-automatic-conversion)
 948                   mime-view-automatic-conversion))
 949         (cte (if ask-coding
 950                  (completing-read "Content Transfer Encoding: "
 951                                   (mime-encoding-alist) nil t)))
 952         entity situation)
 953     (setq entity (get-text-property (car position) 'mime-view-entity)
 954           situation (get-text-property (car position) 'mime-view-situation))
 955     (setq situation
 956           (put-alist
 957            'encoding cte
 958            (put-alist
 959             'coding coding
 960             (put-alist
 961              'body-presentation-method 'mime-display-text
 962              (put-alist '*body 'visible situation)))))
 963     (save-excursion
 964       (delete-region (car position) (cdr position))
 965       (mime-display-entity entity situation))))
 966
 967 (defun mime-preview-type ()
 968   "View part as text without code conversion."
 969   (interactive)
 970   (mime-preview-toggle-content t))
 971
 972 (defun mime-preview-buttonize ()
 973   (interactive)
 974   (save-excursion
 975     (goto-char (point-min))
 976     (let (point)
 977       (while (setq point (next-single-property-change
 978                           (point) 'mime-view-entity))
 979         (goto-char point)
 980         (unless (get-text-property (point) 'mime-button-callback)
 981           (mime-preview-toggle-button))))))
 982
 983 (defun mime-preview-unbuttonize ()
 984   (interactive)
 985   (save-excursion
 986     (goto-char (point-min))
 987     (let (point)
 988       (while (setq point (next-single-property-change
 989                           (point) 'mime-view-entity))
 990         (goto-char point)
 991         (when (get-text-property (point) 'mime-button-callback)
 992           (mime-preview-toggle-button))))))
 993
 994
 995 ;;; @ acting-condition
 996 ;;;
 997
 998 (defvar mime-acting-condition nil
 999   "Condition-tree about how to process entity.")
1000
1001 (if (file-readable-p mailcap-file)
1002     (let ((entries (mailcap-parse-file)))
1003       (while entries
1004         (let ((entry (car entries))
1005               view print shared)
1006           (while entry
1007             (let* ((field (car entry))
1008                    (field-type (car field)))
1009               (cond ((eq field-type 'view)  (setq view field))
1010                     ((eq field-type 'print) (setq print field))
1011                     ((memq field-type '(compose composetyped edit)))
1012                     (t (setq shared (cons field shared)))))
1013             (setq entry (cdr entry)))
1014           (setq shared (nreverse shared))
1015           (ctree-set-calist-with-default
1016            'mime-acting-condition
1017            (append shared (list '(mode . "play")(cons 'method (cdr view)))))
1018           (if print
1019               (ctree-set-calist-with-default
1020                'mime-acting-condition
1021                (append shared
1022                        (list '(mode . "print")(cons 'method (cdr view)))))))
1023         (setq entries (cdr entries)))))
1024
1025 (ctree-set-calist-strictly
1026  'mime-acting-condition
1027  '((type . application)(subtype . octet-stream)
1028    (mode . "play")
1029    (method . mime-detect-content)))
1030
1031 (ctree-set-calist-with-default
1032  'mime-acting-condition
1033  '((mode . "extract")
1034    (method . mime-save-content)))
1035
1036 (ctree-set-calist-strictly
1037  'mime-acting-condition
1038  '((type . text)(subtype . x-rot13-47)(mode . "play")
1039    (method . mime-view-caesar)))
1040 (ctree-set-calist-strictly
1041  'mime-acting-condition
1042  '((type . text)(subtype . x-rot13-47-48)(mode . "play")
1043    (method . mime-view-caesar)))
1044
1045 (ctree-set-calist-strictly
1046  'mime-acting-condition
1047  '((type . message)(subtype . rfc822)(mode . "play")
1048    (method . mime-view-message/rfc822)))
1049 (ctree-set-calist-strictly
1050  'mime-acting-condition
1051  '((type . message)(subtype . partial)(mode . "play")
1052    (method . mime-store-message/partial-piece)))
1053
1054 (ctree-set-calist-strictly
1055  'mime-acting-condition
1056  '((type . message)(subtype . external-body)
1057    ("access-type" . "anon-ftp")
1058    (method . mime-view-message/external-anon-ftp)))
1059
1060 (ctree-set-calist-strictly
1061  'mime-acting-condition
1062  '((type . message)(subtype . external-body)
1063    ("access-type" . "url")
1064    (method . mime-view-message/external-url)))
1065
1066 (ctree-set-calist-strictly
1067  'mime-acting-condition
1068  '((type . application)(subtype . octet-stream)
1069    (method . mime-save-content)))
1070
1071
1072 ;;; @ quitting method
1073 ;;;
1074
1075 (defvar mime-preview-quitting-method-alist
1076   '((mime-show-message-mode
1077      . mime-preview-quitting-method-for-mime-show-message-mode))
1078   "Alist of `major-mode' vs. quitting-method of mime-view.")
1079
1080 (defvar mime-preview-over-to-previous-method-alist nil
1081   "Alist of `major-mode' vs. over-to-previous-method of mime-view.")
1082
1083 (defvar mime-preview-over-to-next-method-alist nil
1084   "Alist of `major-mode' vs. over-to-next-method of mime-view.")
1085
1086
1087 ;;; @ following method
1088 ;;;
1089
1090 (defvar mime-preview-following-method-alist nil
1091   "Alist of `major-mode' vs. following-method of mime-view.")
1092
1093 (defvar mime-view-following-required-fields-list
1094   '("From"))
1095
1096
1097 ;;; @ buffer setup
1098 ;;;
1099
1100 (defun mime-display-entity (entity &optional situation
1101                                    default-situation preview-buffer)
1102   "Display mime-entity ENTITY."
1103   (or preview-buffer
1104       (setq preview-buffer (current-buffer)))
1105   (in-calist-package 'mime-view)
1106   (or situation
1107       (setq situation
1108             (or (ctree-match-calist mime-preview-condition
1109                                     (append (mime-entity-situation entity)
1110                                             default-situation))
1111                 default-situation)))
1112   (let ((button-is-visible (mime-view-button-is-visible situation))
1113         (header-is-visible
1114          (mime-view-header-is-visible situation))
1115         (header-presentation-method
1116          (or (cdr (assq '*header-presentation-method situation))
1117              (cdr (assq 'header-presentation-method situation))
1118              (cdr (assq (cdr (assq 'major-mode situation))
1119                         mime-header-presentation-method-alist))))
1120         (body-is-visible
1121          (mime-view-body-is-visible situation))
1122         (body-presentation-method
1123          (cdr (assq 'body-presentation-method situation)))
1124         (children (mime-entity-children entity))
1125         nb ne nhb nbb)
1126     ;; Check if attachment is specified.
1127     ;; if inline is forced or not.
1128     (unless (or (eq t mime-view-force-inline-types)
1129                 (memq (mime-entity-media-type entity)
1130                       mime-view-force-inline-types)
1131                 (memq (mime-view-entity-type/subtype entity)
1132                       mime-view-force-inline-types)
1133                 ;; whether Content-Disposition header exists.
1134                 (not (mime-entity-content-disposition entity))
1135                 (eq 'inline
1136                     (mime-content-disposition-type
1137                      (mime-entity-content-disposition entity))))
1138       ;; This is attachment.
1139       ;; But show header when this is root entity.
1140       (if (mime-root-entity-p entity)
1141           (progn (setq body-is-visible nil)
1142                  (put-alist 'body 'invisible situation))
1143         (setq header-is-visible nil)
1144         (put-alist 'header 'invisible situation)))
1145     (set-buffer preview-buffer)
1146     (setq nb (point))
1147     (save-restriction
1148       (narrow-to-region nb nb)
1149       (if button-is-visible
1150           (mime-view-insert-entity-button entity
1151                                           ;; work around composite type
1152                                           (not (or children
1153                                                    body-is-visible))))
1154       (when header-is-visible
1155         (setq nhb (point))
1156         (if header-presentation-method
1157             (funcall header-presentation-method entity situation)
1158           (mime-insert-header entity
1159                               mime-view-ignored-field-list
1160                               mime-view-visible-field-list))
1161         (run-hooks 'mime-display-header-hook)
1162         (put-text-property nhb (point-max) 'mime-view-entity-header entity)
1163         (goto-char (point-max))
1164         (insert "\n"))
1165       (setq nbb (point))
1166       (cond (children)
1167             ((and body-is-visible
1168                   (functionp body-presentation-method))
1169              (funcall body-presentation-method entity situation))
1170             (t
1171              ;; When both body and button is not displayed,
1172              ;; there should be a button to indicate there's a part.
1173              (unless button-is-visible
1174                (goto-char (point-max))
1175                (mime-view-insert-entity-button entity
1176                                                ;; work around composite type
1177                                                (not (or children
1178                                                         body-is-visible))))
1179              (unless header-is-visible
1180                (goto-char (point-max))
1181                (insert "\n"))))
1182       (setq ne (point-max)))
1183     (put-text-property nb ne 'mime-view-entity entity)
1184     (put-text-property nb ne 'mime-view-situation situation)
1185     (put-text-property nbb ne 'mime-view-entity-body entity)
1186     (goto-char ne)
1187     (if (and children body-is-visible)
1188         (if (functionp body-presentation-method)
1189             (funcall body-presentation-method entity situation)
1190           (mime-display-multipart/mixed entity situation)))))
1191
1192 ;;; @ MIME viewer mode
1193 ;;;
1194
1195 (defconst mime-view-menu-title "MIME-View")
1196 (defconst mime-view-menu-list
1197   '((up          "Move to upper entity"    mime-preview-move-to-upper)
1198     (previous    "Move to previous entity" mime-preview-move-to-previous)
1199     (next        "Move to next entity"     mime-preview-move-to-next)
1200     (scroll-down "Scroll-down"             mime-preview-scroll-down-entity)
1201     (scroll-up   "Scroll-up"               mime-preview-scroll-up-entity)
1202     (play        "Play current entity"     mime-preview-play-current-entity)
1203     (extract     "Extract current entity"  mime-preview-extract-current-entity)
1204     (print       "Print current entity"    mime-preview-print-current-entity)
1205     (raw "View text without code conversion" mime-preview-inline)
1206     (text "View text with code conversion" mime-preview-text)
1207     (type "View internally as type" mime-preview-type))
1208   "Menu for MIME Viewer.")
1209
1210 (cond ((featurep 'xemacs)
1211        (defvar mime-view-xemacs-popup-menu
1212          (cons mime-view-menu-title
1213                (mapcar (function
1214                         (lambda (item)
1215                           (vector (nth 1 item)(nth 2 item) t)))
1216                        mime-view-menu-list)))
1217        (defun mime-view-xemacs-popup-menu (event)
1218          "Popup the menu in the MIME Viewer buffer"
1219          (interactive "e")
1220          (select-window (event-window event))
1221          (set-buffer (event-buffer event))
1222          (popup-menu 'mime-view-xemacs-popup-menu))
1223        (defvar mouse-button-2 'button2))
1224       (t
1225        (defvar mouse-button-2 [mouse-2])))
1226
1227 (defun mime-view-define-keymap (&optional default)
1228   (let ((mime-view-mode-map (if (keymapp default)
1229                                 (copy-keymap default)
1230                               (make-sparse-keymap))))
1231     (define-key mime-view-mode-map
1232       "u"        (function mime-preview-move-to-upper))
1233     (define-key mime-view-mode-map
1234       "p"        (function mime-preview-move-to-previous))
1235     (define-key mime-view-mode-map
1236       "n"        (function mime-preview-move-to-next))
1237     (define-key mime-view-mode-map
1238       "\e\t"     (function mime-preview-move-to-previous))
1239     (define-key mime-view-mode-map
1240       "\t"       (function mime-preview-move-to-next))
1241     (define-key mime-view-mode-map
1242       " "        (function mime-preview-scroll-up-entity))
1243     (define-key mime-view-mode-map
1244       "\M- "     (function mime-preview-scroll-down-entity))
1245     (define-key mime-view-mode-map
1246       "\177"     (function mime-preview-scroll-down-entity))
1247     (define-key mime-view-mode-map
1248       "\C-m"     (function mime-preview-next-line-entity))
1249     (define-key mime-view-mode-map
1250       "\C-\M-m"  (function mime-preview-previous-line-entity))
1251     (define-key mime-view-mode-map
1252       "v"        (function mime-preview-play-current-entity))
1253     (define-key mime-view-mode-map
1254       "e"        (function mime-preview-extract-current-entity))
1255     (define-key mime-view-mode-map
1256       "\C-c\C-e"        (function mime-preview-extract-current-entity))
1257     (define-key mime-view-mode-map
1258       "i"        (function mime-preview-inline))
1259     (define-key mime-view-mode-map
1260       "c"        (function mime-preview-text))
1261     (define-key mime-view-mode-map
1262       "t"        (function mime-preview-type))
1263     (define-key mime-view-mode-map
1264       "b"        (function mime-preview-buttonize))
1265     (define-key mime-view-mode-map
1266       "B"        (function mime-preview-unbuttonize))
1267     (define-key mime-view-mode-map
1268       "\C-c\C-t\C-h" (function mime-preview-toggle-header))
1269     (define-key mime-view-mode-map
1270       "\C-c\C-th" (function mime-preview-toggle-header))
1271     (define-key mime-view-mode-map
1272       "\C-c\C-t\C-c" (function mime-preview-toggle-content))
1273     (define-key mime-view-mode-map
1274       "\C-c\C-tc" (function mime-preview-toggle-content))
1275     (define-key mime-view-mode-map
1276       "\C-c\C-tH" (function mime-preview-toggle-all-header))
1277     (define-key mime-view-mode-map
1278       "\C-c\C-tb" (function mime-preview-toggle-button))
1279     (define-key mime-view-mode-map
1280       "\C-c\C-p" (function mime-preview-print-current-entity))
1281     (define-key mime-view-mode-map
1282       "a"        (function mime-preview-follow-current-entity))
1283     (define-key mime-view-mode-map
1284       "q"        (function mime-preview-quit))
1285     (define-key mime-view-mode-map
1286       "\C-c\C-x" (function mime-preview-kill-buffer))
1287     ;; (define-key mime-view-mode-map
1288     ;;   "<"        (function beginning-of-buffer))
1289     ;; (define-key mime-view-mode-map
1290     ;;   ">"        (function end-of-buffer))
1291     (define-key mime-view-mode-map
1292       "?"        (function describe-mode))
1293     (define-key mime-view-mode-map
1294       [tab] (function mime-preview-move-to-next))
1295     (define-key mime-view-mode-map
1296       [delete] (function mime-preview-scroll-down-entity))
1297     (define-key mime-view-mode-map
1298       [backspace] (function mime-preview-scroll-down-entity))
1299     (if (functionp default)
1300         (cond ((featurep 'xemacs)
1301                (set-keymap-default-binding mime-view-mode-map default))
1302               (t
1303                (setq mime-view-mode-map
1304                      (append mime-view-mode-map (list (cons t default)))))))
1305     (if mouse-button-2
1306         (define-key mime-view-mode-map
1307           mouse-button-2 (function mime-button-dispatcher)))
1308     (cond ((featurep 'xemacs)
1309            (define-key mime-view-mode-map
1310              mouse-button-3 (function mime-view-xemacs-popup-menu)))
1311           ((>= emacs-major-version 19)
1312            (define-key mime-view-mode-map [menu-bar mime-view]
1313              (cons mime-view-menu-title
1314                    (make-sparse-keymap mime-view-menu-title)))
1315            (mapcar (function
1316                     (lambda (item)
1317                       (define-key mime-view-mode-map
1318                         (vector 'menu-bar 'mime-view (car item))
1319                         (cons (nth 1 item)(nth 2 item)))))
1320                    (reverse mime-view-menu-list))))
1321     (use-local-map mime-view-mode-map)
1322     (run-hooks 'mime-view-define-keymap-hook)))
1323
1324 (defsubst mime-maybe-hide-echo-buffer ()
1325   "Clear mime-echo buffer and delete window for it."
1326   (let ((buf (get-buffer mime-echo-buffer-name)))
1327     (if buf
1328         (save-excursion
1329           (set-buffer buf)
1330           (erase-buffer)
1331           (let ((win (get-buffer-window buf)))
1332             (if win
1333                 (delete-window win)))
1334           (bury-buffer buf)))))
1335
1336 (defvar mime-view-redisplay nil)
1337
1338 ;;;###autoload
1339 (defun mime-display-message (message &optional preview-buffer
1340                                      mother default-keymap-or-function
1341                                      original-major-mode)
1342   "View MESSAGE in MIME-View mode.
1343
1344 Optional argument PREVIEW-BUFFER specifies the buffer of the
1345 presentation.  It must be either nil or a name of preview buffer.
1346
1347 Optional argument MOTHER specifies mother-buffer of the preview-buffer.
1348
1349 Optional argument DEFAULT-KEYMAP-OR-FUNCTION is nil, keymap or
1350 function.  If it is a keymap, keymap of MIME-View mode will be added
1351 to it.  If it is a function, it will be bound as default binding of
1352 keymap of MIME-View mode."
1353   (mime-maybe-hide-echo-buffer)
1354   (let ((win-conf (current-window-configuration)))
1355     (or preview-buffer
1356         (setq preview-buffer
1357               (concat "*Preview-" (mime-entity-name message) "*")))
1358     (or original-major-mode
1359         (setq original-major-mode major-mode))
1360     (let ((inhibit-read-only t))
1361       (set-buffer (get-buffer-create preview-buffer))
1362       (widen)
1363       (erase-buffer)
1364       (if mother
1365           (setq mime-mother-buffer mother))
1366       (setq mime-preview-original-window-configuration win-conf)
1367       (setq major-mode 'mime-view-mode)
1368       (setq mode-name "MIME-View")
1369       (mime-display-entity message nil
1370                            (list (cons 'entity-button 'invisible)
1371                                  (cons 'header 'visible)
1372                                  (cons 'major-mode original-major-mode))
1373                            preview-buffer)
1374       (mime-view-define-keymap default-keymap-or-function)
1375       (set (make-local-variable 'line-move-ignore-invisible) t)
1376       (let ((point
1377              (next-single-property-change (point-min) 'mime-view-entity)))
1378         (if point
1379             (goto-char point)
1380           (goto-char (point-min))
1381           (search-forward "\n\n" nil t)))
1382       (run-hooks 'mime-view-mode-hook)
1383       (set-buffer-modified-p nil)
1384       (setq buffer-read-only t)
1385       preview-buffer)))
1386
1387 ;;;###autoload
1388 (defun mime-view-buffer (&optional raw-buffer preview-buffer mother
1389                                    default-keymap-or-function
1390                                    representation-type)
1391   "View RAW-BUFFER in MIME-View mode.
1392 Optional argument PREVIEW-BUFFER is either nil or a name of preview
1393 buffer.
1394 Optional argument DEFAULT-KEYMAP-OR-FUNCTION is nil, keymap or
1395 function.  If it is a keymap, keymap of MIME-View mode will be added
1396 to it.  If it is a function, it will be bound as default binding of
1397 keymap of MIME-View mode.
1398 Optional argument REPRESENTATION-TYPE is representation-type of
1399 message.  It must be nil, `binary' or `cooked'.  If it is nil,
1400 `cooked' is used as default."
1401   (interactive)
1402   (or raw-buffer
1403       (setq raw-buffer (current-buffer)))
1404   (or representation-type
1405       (setq representation-type
1406             (save-excursion
1407               (set-buffer raw-buffer)
1408               (cdr (or (assq major-mode mime-raw-representation-type-alist)
1409                        (assq t mime-raw-representation-type-alist))))))
1410   (if (eq representation-type 'binary)
1411       (setq representation-type 'buffer))
1412   (setq preview-buffer (mime-display-message
1413                         (mime-open-entity representation-type raw-buffer)
1414                         preview-buffer mother default-keymap-or-function))
1415   (or (get-buffer-window preview-buffer)
1416       (let ((r-win (get-buffer-window raw-buffer)))
1417         (if r-win
1418             (set-window-buffer r-win preview-buffer)
1419           (let ((m-win (and mother (get-buffer-window mother))))
1420             (if m-win
1421                 (set-window-buffer m-win preview-buffer)
1422               (switch-to-buffer preview-buffer)))))))
1423
1424 (defun mime-view-mode (&optional mother ctl encoding
1425                                  raw-buffer preview-buffer
1426                                  default-keymap-or-function)
1427   "Major mode for viewing MIME message.
1428
1429 Here is a list of the standard keys for mime-view-mode.
1430
1431 key             feature
1432 ---             -------
1433
1434 u               Move to upper content
1435 p or M-TAB      Move to previous content
1436 n or TAB        Move to next content
1437 SPC             Scroll up or move to next content
1438 M-SPC or DEL    Scroll down or move to previous content
1439 RET             Move to next line
1440 M-RET           Move to previous line
1441 v               Decode current content as `play mode'
1442 e               Decode current content as `extract mode'
1443 C-c C-p         Decode current content as `print mode'
1444 a               Followup to current content.
1445 q               Quit
1446 button-2        Move to point under the mouse cursor
1447                 and decode current content as `play mode'"
1448   (interactive)
1449   (unless mime-view-redisplay
1450     (save-excursion
1451       (if raw-buffer (set-buffer raw-buffer))
1452       (let ((type
1453              (cdr
1454               (or (assq major-mode mime-raw-representation-type-alist)
1455                   (assq t mime-raw-representation-type-alist)))))
1456         (if (eq type 'binary)
1457             (setq type 'buffer))
1458         (setq mime-message-structure (mime-open-entity type raw-buffer))
1459         (or (mime-entity-content-type mime-message-structure)
1460             (mime-entity-set-content-type-internal
1461              mime-message-structure ctl)))
1462       (or (mime-entity-encoding mime-message-structure)
1463           (mime-entity-set-encoding-internal mime-message-structure encoding))))
1464   (mime-display-message mime-message-structure preview-buffer
1465                         mother default-keymap-or-function))
1466
1467
1468 ;;; @@ playing
1469 ;;;
1470
1471 (autoload 'mime-preview-play-current-entity "mime-play"
1472   "Play current entity." t)
1473
1474 (defun mime-preview-extract-current-entity (&optional ignore-examples)
1475   "Extract current entity into file (maybe).
1476 It decodes current entity to call internal or external method as
1477 \"extract\" mode.  The method is selected from variable
1478 `mime-acting-condition'."
1479   (interactive "P")
1480   (mime-preview-play-current-entity ignore-examples "extract"))
1481
1482 (defun mime-preview-print-current-entity (&optional ignore-examples)
1483   "Print current entity (maybe).
1484 It decodes current entity to call internal or external method as
1485 \"print\" mode.  The method is selected from variable
1486 `mime-acting-condition'."
1487   (interactive "P")
1488   (mime-preview-play-current-entity ignore-examples "print"))
1489
1490
1491 ;;; @@ following
1492 ;;;
1493
1494 (defun mime-preview-follow-current-entity ()
1495   "Write follow message to current entity.
1496 It calls following-method selected from variable
1497 `mime-preview-following-method-alist'."
1498   (interactive)
1499   (let (entity position entity-node-id header-exists)
1500     (while (null (setq entity
1501                        (get-text-property (point) 'mime-view-entity)))
1502       (backward-char))
1503     (setq position (mime-preview-entity-boundary))
1504     (setq entity-node-id (mime-entity-node-id entity)
1505           header-exists
1506           ;; When on an invisible entity, there's no header.
1507           (or (mime-view-header-is-visible
1508                (get-text-property (car position) 'mime-view-situation))
1509               ;; We are on a rfc822 button.
1510               (and (eq 'message (mime-entity-media-type
1511                                  entity))
1512                    (eq 'rfc822 (mime-entity-media-subtype
1513                                 entity))
1514                    (get-text-property
1515                     (next-single-property-change
1516                      (car position) 'mime-button-callback
1517                      nil (point-max))
1518                     'mime-view-entity-header))))
1519     (let* ((mode (mime-preview-original-major-mode 'recursive))
1520            (new-name
1521             (format "%s-%s" (buffer-name) (reverse entity-node-id)))
1522            new-buf
1523            (the-buf (current-buffer))
1524            fields)
1525       (save-excursion
1526         (set-buffer (setq new-buf (get-buffer-create new-name)))
1527         (erase-buffer)
1528         ;; Compatibility kludge.
1529         ;; FSF Emacs can only take substring of current-buffer.
1530         (insert
1531          (save-excursion
1532            (set-buffer the-buf)
1533            (buffer-substring-no-properties (car position)
1534                                            (cdr position))))
1535         (if header-exists
1536             (delete-region (goto-char (point-min))
1537                            (re-search-forward "^$"))
1538           (goto-char (point-min))
1539           (insert "\n"))
1540         (goto-char (point-min))
1541         (let ((current-entity
1542                (if (and (eq (mime-entity-media-type entity) 'message)
1543                         (eq (mime-entity-media-subtype entity) 'rfc822))
1544                    (car (mime-entity-children entity))
1545                  entity)))
1546           (while (and current-entity
1547                       (if (and (eq (mime-entity-media-type
1548                                     current-entity) 'message)
1549                                (eq (mime-entity-media-subtype
1550                                     current-entity) 'rfc822))
1551                           nil
1552                         (mime-insert-header current-entity fields)
1553                         t))
1554             (setq fields (std11-collect-field-names)
1555                   current-entity (mime-entity-parent current-entity))))
1556         (let ((rest mime-view-following-required-fields-list)
1557               field-name ret)
1558           (while rest
1559             (setq field-name (car rest))
1560             (or (std11-field-body field-name)
1561                 (progn
1562                   (save-excursion
1563                     (set-buffer the-buf)
1564                     (let ((entity (when mime-mother-buffer
1565                                     (set-buffer mime-mother-buffer)
1566                                     (get-text-property (point)
1567                                                        'mime-view-entity))))
1568                       (while (and entity
1569                                   (null (setq ret (mime-entity-fetch-field
1570                                                    entity field-name))))
1571                         (setq entity (mime-entity-parent entity)))))
1572                   (if ret
1573                       (insert (concat field-name ": " ret "\n")))))
1574             (setq rest (cdr rest))))
1575         (mime-decode-header-in-buffer))
1576       (let ((f (cdr (assq mode mime-preview-following-method-alist))))
1577         (if (functionp f)
1578             (funcall f new-buf)
1579           (message
1580            (format
1581             "Sorry, following method for %s is not implemented yet."
1582             mode)))))))
1583
1584
1585 ;;; @@ moving
1586 ;;;
1587
1588 (defun mime-preview-move-to-upper ()
1589   "Move to upper entity.
1590 If there is no upper entity, call function `mime-preview-quit'."
1591   (interactive)
1592   (let (cinfo)
1593     (while (null (setq cinfo
1594                        (get-text-property (point) 'mime-view-entity)))
1595       (backward-char))
1596     (let ((r (mime-entity-parent cinfo))
1597           point)
1598       (catch 'tag
1599         (while (setq point (previous-single-property-change
1600                             (point) 'mime-view-entity))
1601           (goto-char point)
1602           (when (eq r (get-text-property (point) 'mime-view-entity))
1603             (if (or (eq mime-preview-move-scroll t)
1604                     (and mime-preview-move-scroll
1605                          (>= point
1606                              (save-excursion
1607                                (move-to-window-line -1)
1608                                (forward-line (* -1 next-screen-context-lines))
1609                                (beginning-of-line)
1610                                (point)))))
1611                 (recenter next-screen-context-lines))
1612             (throw 'tag t)))
1613         (mime-preview-quit)))))
1614
1615 (defun mime-preview-move-to-previous ()
1616   "Move to previous entity.
1617 If there is no previous entity, it calls function registered in
1618 variable `mime-preview-over-to-previous-method-alist'."
1619   (interactive)
1620   (while (and (not (bobp))
1621               (null (get-text-property (point) 'mime-view-entity)))
1622     (backward-char))
1623   (let ((point (previous-single-property-change (point) 'mime-view-entity)))
1624     (if (and point
1625              (>= point (point-min)))
1626         (if (get-text-property (1- point) 'mime-view-entity)
1627             (progn (goto-char point)
1628                    (if
1629                     (or (eq mime-preview-move-scroll t)
1630                         (and mime-preview-move-scroll
1631                              (<= point
1632                                 (save-excursion
1633                                   (move-to-window-line 0)
1634                                   (forward-line next-screen-context-lines)
1635                                   (end-of-line)
1636                                   (point)))))
1637                         (recenter next-screen-context-lines)))
1638           (goto-char (1- point))
1639           (mime-preview-move-to-previous))
1640       (let ((f (assq (mime-preview-original-major-mode)
1641                      mime-preview-over-to-previous-method-alist)))
1642         (if f
1643             (funcall (cdr f)))))))
1644
1645 (defun mime-preview-move-to-next ()
1646   "Move to next entity.
1647 If there is no previous entity, it calls function registered in
1648 variable `mime-preview-over-to-next-method-alist'."
1649   (interactive)
1650   (while (and (not (eobp))
1651               (null (get-text-property (point) 'mime-view-entity)))
1652     (forward-char))
1653   (let ((point (next-single-property-change (point) 'mime-view-entity)))
1654     (if (and point
1655              (<= point (point-max)))
1656         (progn
1657           (goto-char point)
1658           (if (null (get-text-property point 'mime-view-entity))
1659               (mime-preview-move-to-next)
1660             (and
1661              (or (eq mime-preview-move-scroll t)
1662                  (and mime-preview-move-scroll
1663                       (>= point
1664                          (save-excursion
1665                            (move-to-window-line -1)
1666                            (forward-line
1667                             (* -1 next-screen-context-lines))
1668                            (beginning-of-line)
1669                            (point)))))
1670                  (recenter next-screen-context-lines))))
1671       (let ((f (assq (mime-preview-original-major-mode)
1672                      mime-preview-over-to-next-method-alist)))
1673         (if f
1674             (funcall (cdr f)))))))
1675
1676 (defun mime-preview-scroll-up-entity (&optional h)
1677   "Scroll up current entity.
1678 If reached to (point-max), it calls function registered in variable
1679 `mime-preview-over-to-next-method-alist'."
1680   (interactive)
1681   (if (eobp)
1682       (let ((f (assq (mime-preview-original-major-mode)
1683                      mime-preview-over-to-next-method-alist)))
1684         (if f
1685             (funcall (cdr f))))
1686     (let ((point
1687            (or (next-single-property-change (point) 'mime-view-entity)
1688                (point-max)))
1689           (bottom (window-end (selected-window))))
1690       (if (and (not h)
1691                (> bottom point)
1692                (not mime-preview-scroll-full-screen))
1693           (progn (goto-char point)
1694                  (recenter next-screen-context-lines))
1695         (condition-case nil
1696             (scroll-up h)
1697           (end-of-buffer
1698            (goto-char (point-max))))))))
1699
1700 (defun mime-preview-scroll-down-entity (&optional h)
1701   "Scroll down current entity.
1702 If reached to (point-min), it calls function registered in variable
1703 `mime-preview-over-to-previous-method-alist'."
1704   (interactive)
1705   (if (bobp)
1706       (let ((f (assq (mime-preview-original-major-mode)
1707                      mime-preview-over-to-previous-method-alist)))
1708         (if f
1709             (funcall (cdr f))))
1710     (let ((point
1711            (or (previous-single-property-change (point) 'mime-view-entity)
1712                (point-min)))
1713           (top (window-start (selected-window))))
1714       (if (and (not h)
1715                (< top point)
1716                (not mime-preview-scroll-full-screen))
1717           (progn (goto-char point)
1718                  (recenter (* -1 next-screen-context-lines)))
1719         (condition-case nil
1720             (scroll-down h)
1721           (beginning-of-buffer
1722            (goto-char (point-min))))))))
1723
1724 (defun mime-preview-next-line-entity (&optional lines)
1725   "Scroll up one line (or prefix LINES lines).
1726 If LINES is negative, scroll down LINES lines."
1727   (interactive "p")
1728   (mime-preview-scroll-up-entity (or lines 1)))
1729
1730 (defun mime-preview-previous-line-entity (&optional lines)
1731   "Scrroll down one line (or prefix LINES lines).
1732 If LINES is negative, scroll up LINES lines."
1733   (interactive "p")
1734   (mime-preview-scroll-down-entity (or lines 1)))
1735
1736 (defun mime-preview-entity-boundary (&optional point)
1737   (or point
1738       (setq point (point)))
1739   (and (eq point (point-max))
1740        (setq point (1- (point-max))))
1741   (let ((entity (get-text-property point 'mime-view-entity))
1742         (start (previous-single-property-change (1+ point) 'mime-view-entity
1743                                                 nil (point-min)))
1744         end done)
1745     (if (not (mime-entity-node-id entity))
1746         (setq end (point-max))
1747       (while (and (mime-entity-children entity)
1748                   (not done))
1749         (if (not (mime-view-body-is-visible
1750                   (get-text-property point 'mime-view-situation)))
1751             (setq done t)
1752           ;; If the part is shown, search the last part.
1753           (let* ((child (car (last (mime-entity-children entity))))
1754                  (node-id (mime-entity-node-id child))
1755                  (tmp-node-id (mime-entity-node-id
1756                                  (get-text-property point
1757                                                     'mime-view-entity))))
1758             (while (or (< (length tmp-node-id)
1759                           (length node-id))
1760                        (not (eq (nthcdr (- (length tmp-node-id)
1761                                            (length node-id))
1762                                         tmp-node-id)
1763                                 node-id)))
1764               (setq point
1765                     (next-single-property-change point 'mime-view-entity)
1766                     tmp-node-id (mime-entity-node-id
1767                                  (get-text-property point
1768                                                     'mime-view-entity))))
1769             (setq entity child))))
1770       (setq end (next-single-property-change
1771                  point 'mime-view-entity nil (point-max))))
1772     (cons start end)))
1773
1774 (defun mime-preview-toggle-header (&optional show)
1775   "Toggle display of entity header.
1776 When prefix is given, it always displays the header."
1777   (interactive "P")
1778   (let ((inhibit-read-only t)
1779         (mime-view-force-inline-types t)
1780         (position (mime-preview-entity-boundary))
1781         entity header-is-visible situation)
1782     (setq entity (get-text-property (car position) 'mime-view-entity)
1783           situation (get-text-property (car position) 'mime-view-situation))
1784     (setq header-is-visible (mime-view-header-is-visible situation))
1785     (save-excursion
1786       (delete-region (car position) (cdr position))
1787       (if (or show (not header-is-visible))
1788           (mime-display-entity
1789            entity
1790            (del-alist '*entity-button
1791                       (put-alist '*header 'visible
1792                                  situation)))
1793         (mime-display-entity
1794          entity
1795          (put-alist '*entity-button
1796                     'visible
1797                     (put-alist '*header 'invisible
1798                                situation)))))))
1799
1800 (defun mime-preview-toggle-all-header (&optional show)
1801   "Toggle display of entity header.
1802 When prefix is given, it always displays the header."
1803   (interactive "P")
1804   (let ((inhibit-read-only t)
1805         (mime-view-force-inline-types t)
1806         (position (mime-preview-entity-boundary))
1807         entity header-is-visible situation)
1808     (setq entity (get-text-property (car position) 'mime-view-entity)
1809           situation (get-text-property (car position) 'mime-view-situation))
1810     (setq header-is-visible (mime-view-header-is-visible situation))
1811     (save-excursion
1812       (delete-region (car position) (cdr position))
1813       (if (or show (not header-is-visible))
1814           (mime-display-entity
1815            entity
1816            (del-alist '*entity-button
1817                       (del-alist '*header
1818                                  (del-alist '*header-presentation-method
1819                                             situation))))
1820         (mime-display-entity
1821          entity
1822          (put-alist
1823           '*entity-button
1824           'visible
1825           (put-alist
1826            '*header 'invisible
1827            (put-alist '*header-presentation-method
1828                       #'(lambda (entity situation)
1829                           (mime-insert-header
1830                            entity nil '(".*")))
1831                       situation))))))))
1832
1833 (defun mime-preview-toggle-content (&optional show)
1834   "Toggle display of entity body.
1835 When prefix is given, it always displays the content."
1836   (interactive "P")
1837   (let ((inhibit-read-only t)
1838         (mime-view-force-inline-types t)
1839         (position (mime-preview-entity-boundary))
1840         entity situation)
1841     (setq entity (get-text-property (car position) 'mime-view-entity)
1842           situation (get-text-property (car position) 'mime-view-situation))
1843     (setq situation
1844           (if (or show (not (mime-view-body-is-visible situation)))
1845               (del-alist
1846                '*entity-button
1847                (put-alist '*body 'visible situation))
1848             (put-alist
1849              '*entity-button 'visible
1850              (put-alist '*body 'invisible situation))))
1851     (save-excursion
1852       (delete-region (car position) (cdr position))
1853       (mime-display-entity entity situation))))
1854
1855 (defun mime-preview-toggle-button (&optional show)
1856   "Toggle display of entity button.
1857 When prefix is given, it always displays the content."
1858   (interactive "P")
1859   (let ((inhibit-read-only t)
1860         (mime-view-force-inline-types t)
1861         (position (mime-preview-entity-boundary))
1862         entity situation button-is-visible)
1863     (setq entity (get-text-property (car position) 'mime-view-entity)
1864           situation (get-text-property (car position) 'mime-view-situation)
1865           button-is-visible (mime-view-button-is-visible situation))
1866     (save-excursion
1867       (delete-region (car position) (cdr position))
1868       (if (or show (not button-is-visible))
1869           (mime-display-entity entity
1870                                (put-alist '*entity-button
1871                                           'visible situation))
1872         (mime-display-entity entity
1873                              (put-alist '*entity-button
1874                                         'invisible situation))))))
1875
1876 ;;; @@ quitting
1877 ;;;
1878
1879 (defun mime-preview-quit ()
1880   "Quit from MIME-preview buffer.
1881 It calls function registered in variable
1882 `mime-preview-quitting-method-alist'."
1883   (interactive)
1884   (let ((r (assq (mime-preview-original-major-mode)
1885                  mime-preview-quitting-method-alist)))
1886     (if r
1887         (funcall (cdr r))
1888       (kill-buffer (current-buffer)))))
1889
1890 (defun mime-preview-kill-buffer ()
1891   (interactive)
1892   (kill-buffer (current-buffer)))
1893
1894
1895 ;;; @ end
1896 ;;;
1897
1898 (provide 'mime-view)
1899
1900 (run-hooks 'mime-view-load-hook)
1901
1902 ;;; mime-view.el ends here