mime-view.el

   1 ;;; mime-view.el --- interactive MIME viewer for GNU Emacs
   2
   3 ;; Copyright (C) 1995,1996,1997,1998 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 WEMI (Widget based Emacs 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 'std11)
  31 (require 'mel)
  32 (require 'eword-decode)
  33 (require 'mime-parse)
  34 (require 'semi-def)
  35 (require 'calist)
  36 (require 'alist)
  37 (require 'mailcap)
  38
  39
  40 ;;; @ version
  41 ;;;
  42
  43 (defconst mime-view-version-string
  44   `,(concat (car mime-module-version) " MIME-View "
  45             (mapconcat #'number-to-string (cddr mime-module-version) ".")
  46             " (" (cadr mime-module-version) ")"))
  47
  48
  49 ;;; @ variables
  50 ;;;
  51
  52 (defgroup mime-view nil
  53   "MIME view mode"
  54   :group 'mime)
  55
  56 (defcustom mime-view-find-every-acting-situation t
  57   "*Find every available acting-situation if non-nil."
  58   :group 'mime-view
  59   :type 'boolean)
  60
  61 (defcustom mime-acting-situation-examples-file "~/.mime-example"
  62   "*File name of example about acting-situation demonstrated by user."
  63   :group 'mime-view
  64   :type 'file)
  65
  66
  67 ;;; @ in raw-buffer (representation space)
  68 ;;;
  69
  70 (defvar mime-raw-message-info nil
  71   "Information about structure of message.
  72 Please use reference function `mime-entity-SLOT' to get value of SLOT.
  73
  74 Following is a list of slots of the structure:
  75
  76 buffer                  buffer includes this entity (buffer).
  77 node-id                 node-id (list of integers)
  78 header-start            minimum point of header in raw-buffer
  79 header-end              maximum point of header in raw-buffer
  80 body-start              minimum point of body in raw-buffer
  81 body-end                maximum point of body in raw-buffer
  82 content-type            content-type (content-type)
  83 content-disposition     content-disposition (content-disposition)
  84 encoding                Content-Transfer-Encoding (string or nil)
  85 children                entities included in this entity (list of entity)
  86
  87 If an entity includes other entities in its body, such as multipart or
  88 message/rfc822, `mime-entity' structures of them are included in
  89 `children', so the `mime-entity' structure become a tree.")
  90 (make-variable-buffer-local 'mime-raw-message-info)
  91
  92
  93 (defvar mime-preview-buffer nil
  94   "MIME-preview buffer corresponding with the (raw) buffer.")
  95 (make-variable-buffer-local 'mime-preview-buffer)
  96
  97
  98 (defvar mime-raw-representation-type nil
  99   "Representation-type of mime-raw-buffer.
 100 It must be nil, `binary' or `cooked'.
 101 If it is nil, `mime-raw-representation-type-alist' is used as default
 102 value.
 103 Notice that this variable is usually used as buffer local variable in
 104 raw-buffer.")
 105
 106 (make-variable-buffer-local 'mime-raw-representation-type)
 107
 108 (defvar mime-raw-representation-type-alist
 109   '((mime-show-message-mode     . binary)
 110     (mime-temp-message-mode     . binary)
 111     (t                          . cooked)
 112     )
 113   "Alist of major-mode vs. representation-type of mime-raw-buffer.
 114 Each element looks like (SYMBOL . REPRESENTATION-TYPE).  SYMBOL is
 115 major-mode or t.  t means default.  REPRESENTATION-TYPE must be
 116 `binary' or `cooked'.
 117 This value is overridden by buffer local variable
 118 `mime-raw-representation-type' if it is not nil.")
 119
 120
 121 (defsubst mime-raw-find-entity-from-node-id (entity-node-id
 122                                              &optional message-info)
 123   "Return entity from ENTITY-NODE-ID in mime-raw-buffer.
 124 If optional argument MESSAGE-INFO is not specified,
 125 `mime-raw-message-info' is used."
 126   (mime-raw-find-entity-from-number (reverse entity-node-id) message-info))
 127
 128 (defun mime-raw-find-entity-from-number (entity-number &optional message-info)
 129   "Return entity from ENTITY-NUMBER in mime-raw-buffer.
 130 If optional argument MESSAGE-INFO is not specified,
 131 `mime-raw-message-info' is used."
 132   (or message-info
 133       (setq message-info mime-raw-message-info))
 134   (if (eq entity-number t)
 135       message-info
 136     (let ((sn (car entity-number)))
 137       (if (null sn)
 138           message-info
 139         (let ((rc (nth sn (mime-entity-children message-info))))
 140           (if rc
 141               (mime-raw-find-entity-from-number (cdr entity-number) rc)
 142             ))
 143         ))))
 144
 145 (defun mime-raw-find-entity-from-point (point &optional message-info)
 146   "Return entity from POINT in mime-raw-buffer.
 147 If optional argument MESSAGE-INFO is not specified,
 148 `mime-raw-message-info' is used."
 149   (or message-info
 150       (setq message-info mime-raw-message-info))
 151   (if (and (<= (mime-entity-point-min message-info) point)
 152            (<= point (mime-entity-point-max message-info)))
 153       (let ((children (mime-entity-children message-info)))
 154         (catch 'tag
 155           (while children
 156             (let ((ret
 157                    (mime-raw-find-entity-from-point point (car children))))
 158               (if ret
 159                   (throw 'tag ret)
 160                 ))
 161             (setq children (cdr children)))
 162           message-info))))
 163
 164
 165 ;;; @ in preview-buffer (presentation space)
 166 ;;;
 167
 168 (defvar mime-mother-buffer nil
 169   "Mother buffer corresponding with the (MIME-preview) buffer.
 170 If current MIME-preview buffer is generated by other buffer, such as
 171 message/partial, it is called `mother-buffer'.")
 172 (make-variable-buffer-local 'mime-mother-buffer)
 173
 174 (defvar mime-raw-buffer nil
 175   "Raw buffer corresponding with the (MIME-preview) buffer.")
 176 (make-variable-buffer-local 'mime-raw-buffer)
 177
 178 (defvar mime-preview-original-window-configuration nil
 179   "Window-configuration before mime-view-mode is called.")
 180 (make-variable-buffer-local 'mime-preview-original-window-configuration)
 181
 182 (defun mime-preview-original-major-mode (&optional recursive)
 183   "Return major-mode of original buffer.
 184 If optional argument RECURSIVE is non-nil and current buffer has
 185 mime-mother-buffer, it returns original major-mode of the
 186 mother-buffer."
 187   (if (and recursive mime-mother-buffer)
 188       (save-excursion
 189         (set-buffer mime-mother-buffer)
 190         (mime-preview-original-major-mode recursive)
 191         )
 192     (save-excursion
 193       (set-buffer
 194        (mime-entity-buffer
 195         (get-text-property (point-min) 'mime-view-entity)))
 196       major-mode)))
 197
 198
 199 ;;; @ entity information
 200 ;;;
 201
 202 (defsubst mime-entity-parent (entity &optional message-info)
 203   "Return mother entity of ENTITY.
 204 If optional argument MESSAGE-INFO is not specified,
 205 `mime-raw-message-info' in buffer of ENTITY is used."
 206   (mime-raw-find-entity-from-node-id
 207    (cdr (mime-entity-node-id entity))
 208    (or message-info
 209        (save-excursion
 210          (set-buffer (mime-entity-buffer entity))
 211          mime-raw-message-info))))
 212
 213 (defun mime-entity-situation (entity)
 214   "Return situation of ENTITY."
 215   (append (or (mime-entity-content-type entity)
 216               (make-mime-content-type 'text 'plain))
 217           (let ((d (mime-entity-content-disposition entity)))
 218             (cons (cons 'disposition-type
 219                         (mime-content-disposition-type d))
 220                   (mapcar (function
 221                            (lambda (param)
 222                              (let ((name (car param)))
 223                                (cons (cond ((string= name "filename")
 224                                             'filename)
 225                                            ((string= name "creation-date")
 226                                             'creation-date)
 227                                            ((string= name "modification-date")
 228                                             'modification-date)
 229                                            ((string= name "read-date")
 230                                             'read-date)
 231                                            ((string= name "size")
 232                                             'size)
 233                                            (t (cons 'disposition (car param))))
 234                                      (cdr param)))))
 235                           (mime-content-disposition-parameters d))
 236                   ))
 237           (list (cons 'encoding (mime-entity-encoding entity))
 238                 (cons 'major-mode
 239                       (save-excursion
 240                         (set-buffer (mime-entity-buffer entity))
 241                         major-mode)))
 242           ))
 243
 244
 245 (defvar mime-view-uuencode-encoding-name-list '("x-uue" "x-uuencode"))
 246
 247 (defun mime-raw-get-uu-filename ()
 248   (save-excursion
 249     (if (re-search-forward "^begin [0-9]+ " nil t)
 250         (if (looking-at ".+$")
 251             (buffer-substring (match-beginning 0)(match-end 0))
 252           ))))
 253
 254 (defun mime-raw-get-subject (entity)
 255   (or (std11-find-field-body '("Content-Description" "Subject"))
 256       (let ((ret (mime-entity-content-disposition entity)))
 257         (and ret
 258              (setq ret (mime-content-disposition-filename ret))
 259              (std11-strip-quoted-string ret)
 260              ))
 261       (let ((ret (mime-entity-content-type entity)))
 262         (and ret
 263              (setq ret
 264                    (cdr
 265                     (let ((param (mime-content-type-parameters ret)))
 266                       (or (assoc "name" param)
 267                           (assoc "x-name" param))
 268                       )))
 269              (std11-strip-quoted-string ret)
 270              ))
 271       (if (member (mime-entity-encoding entity)
 272                   mime-view-uuencode-encoding-name-list)
 273           (mime-raw-get-uu-filename))
 274       ""))
 275
 276
 277 (defsubst mime-raw-point-to-entity-node-id (point &optional message-info)
 278   "Return entity-node-id from POINT in mime-raw-buffer.
 279 If optional argument MESSAGE-INFO is not specified,
 280 `mime-raw-message-info' is used."
 281   (mime-entity-node-id (mime-raw-find-entity-from-point point message-info)))
 282
 283 (defsubst mime-raw-point-to-entity-number (point &optional message-info)
 284   "Return entity-number from POINT in mime-raw-buffer.
 285 If optional argument MESSAGE-INFO is not specified,
 286 `mime-raw-message-info' is used."
 287   (mime-entity-number (mime-raw-find-entity-from-point point message-info)))
 288
 289 (defun mime-raw-flatten-message-info (&optional message-info)
 290   "Return list of entity in mime-raw-buffer.
 291 If optional argument MESSAGE-INFO is not specified,
 292 `mime-raw-message-info' is used."
 293   (or message-info
 294       (setq message-info mime-raw-message-info))
 295   (let ((dest (list message-info))
 296         (rcl (mime-entity-children message-info)))
 297     (while rcl
 298       (setq dest (nconc dest (mime-raw-flatten-message-info (car rcl))))
 299       (setq rcl (cdr rcl)))
 300     dest))
 301
 302
 303 ;;; @ presentation of preview
 304 ;;;
 305
 306 ;;; @@ entity-button
 307 ;;;
 308
 309 ;;; @@@ predicate function
 310 ;;;
 311
 312 (defun mime-view-entity-button-visible-p (entity)
 313   "Return non-nil if header of ENTITY is visible.
 314 Please redefine this function if you want to change default setting."
 315   (let ((media-type (mime-entity-media-type entity))
 316         (media-subtype (mime-entity-media-subtype entity)))
 317     (or (not (eq media-type 'application))
 318         (and (not (eq media-subtype 'x-selection))
 319              (or (not (eq media-subtype 'octet-stream))
 320                  (let ((mother-entity (mime-entity-parent entity)))
 321                    (or (not (eq (mime-entity-media-type mother-entity)
 322                                 'multipart))
 323                        (not (eq (mime-entity-media-subtype mother-entity)
 324                                 'encrypted)))
 325                    )
 326                  )))))
 327
 328 ;;; @@@ entity button generator
 329 ;;;
 330
 331 (defun mime-view-insert-entity-button (entity subject)
 332   "Insert entity-button of ENTITY."
 333   (let ((entity-node-id (mime-entity-node-id entity))
 334         (params (mime-entity-parameters entity)))
 335     (mime-insert-button
 336      (let ((access-type (assoc "access-type" params))
 337            (num (or (cdr (assoc "x-part-number" params))
 338                     (if (consp entity-node-id)
 339                         (mapconcat (function
 340                                     (lambda (num)
 341                                       (format "%s" (1+ num))
 342                                       ))
 343                                    (reverse entity-node-id) ".")
 344                       "0"))
 345                 ))
 346        (cond (access-type
 347               (let ((server (assoc "server" params)))
 348                 (setq access-type (cdr access-type))
 349                 (if server
 350                     (format "%s %s ([%s] %s)"
 351                             num subject access-type (cdr server))
 352                 (let ((site (cdr (assoc "site" params)))
 353                       (dir (cdr (assoc "directory" params)))
 354                       )
 355                   (format "%s %s ([%s] %s:%s)"
 356                           num subject access-type site dir)
 357                   )))
 358             )
 359            (t
 360             (let ((media-type (mime-entity-media-type entity))
 361                   (media-subtype (mime-entity-media-subtype entity))
 362                   (charset (cdr (assoc "charset" params)))
 363                   (encoding (mime-entity-encoding entity)))
 364               (concat
 365                num " " subject
 366                (let ((rest
 367                       (format " <%s/%s%s%s>"
 368                               media-type media-subtype
 369                               (if charset
 370                                   (concat "; " charset)
 371                                 "")
 372                               (if encoding
 373                                   (concat " (" encoding ")")
 374                                 ""))))
 375                  (if (>= (+ (current-column)(length rest))(window-width))
 376                      "\n\t")
 377                  rest)))
 378             )))
 379      (function mime-preview-play-current-entity))
 380     ))
 381
 382
 383 ;;; @@ entity-header
 384 ;;;
 385
 386 ;;; @@@ entity header filter
 387 ;;;
 388
 389 (defvar mime-view-content-header-filter-alist nil)
 390
 391 (defun mime-view-default-content-header-filter ()
 392   (mime-view-cut-header)
 393   (eword-decode-header)
 394   )
 395
 396 ;;; @@@ entity field cutter
 397 ;;;
 398
 399 (defvar mime-view-ignored-field-list
 400   '(".*Received" ".*Path" ".*Id" "References"
 401     "Replied" "Errors-To"
 402     "Lines" "Sender" ".*Host" "Xref"
 403     "Content-Type" "Precedence"
 404     "Status" "X-VM-.*")
 405   "All fields that match this list will be hidden in MIME preview buffer.
 406 Each elements are regexp of field-name.")
 407
 408 (defvar mime-view-ignored-field-regexp
 409   (concat "^"
 410           (apply (function regexp-or) mime-view-ignored-field-list)
 411           ":"))
 412
 413 (defvar mime-view-visible-field-list '("Dnas.*" "Message-Id")
 414   "All fields that match this list will be displayed in MIME preview buffer.
 415 Each elements are regexp of field-name.")
 416
 417 (defun mime-view-cut-header ()
 418   (goto-char (point-min))
 419   (while (re-search-forward mime-view-ignored-field-regexp nil t)
 420     (let* ((beg (match-beginning 0))
 421            (end (match-end 0))
 422            (name (buffer-substring beg end))
 423            )
 424       (catch 'visible
 425         (let ((rest mime-view-visible-field-list))
 426           (while rest
 427             (if (string-match (car rest) name)
 428                 (throw 'visible nil)
 429               )
 430             (setq rest (cdr rest))))
 431         (delete-region beg
 432                        (save-excursion
 433                          (if (re-search-forward "^\\([^ \t]\\|$\\)" nil t)
 434                              (match-beginning 0)
 435                            (point-max))))
 436         ))))
 437
 438
 439 ;;; @@ entity-body
 440 ;;;
 441
 442 ;;; @@@ predicate function
 443 ;;;
 444
 445 (defun mime-calist::field-match-method-as-default-rule (calist
 446                                                         field-type field-value)
 447   (let ((s-field (assq field-type calist)))
 448     (cond ((null s-field)
 449            (cons (cons field-type field-value) calist)
 450            )
 451           (t calist))))
 452
 453 (define-calist-field-match-method
 454   'header #'mime-calist::field-match-method-as-default-rule)
 455
 456 (define-calist-field-match-method
 457   'body #'mime-calist::field-match-method-as-default-rule)
 458
 459
 460 (defvar mime-preview-condition nil
 461   "Condition-tree about how to display entity.")
 462
 463 (ctree-set-calist-strictly
 464  'mime-preview-condition '((type . application)(subtype . octet-stream)
 465                            (encoding . nil)
 466                            (body . visible)))
 467 (ctree-set-calist-strictly
 468  'mime-preview-condition '((type . application)(subtype . octet-stream)
 469                            (encoding . "7bit")
 470                            (body . visible)))
 471 (ctree-set-calist-strictly
 472  'mime-preview-condition '((type . application)(subtype . octet-stream)
 473                            (encoding . "8bit")
 474                            (body . visible)))
 475
 476 (ctree-set-calist-strictly
 477  'mime-preview-condition '((type . application)(subtype . pgp)
 478                            (body . visible)))
 479
 480 (ctree-set-calist-strictly
 481  'mime-preview-condition '((type . application)(subtype . x-latex)
 482                            (body . visible)))
 483
 484 (ctree-set-calist-strictly
 485  'mime-preview-condition '((type . application)(subtype . x-selection)
 486                            (body . visible)))
 487
 488 (ctree-set-calist-strictly
 489  'mime-preview-condition '((type . application)(subtype . x-comment)
 490                            (body . visible)))
 491
 492 (ctree-set-calist-strictly
 493  'mime-preview-condition '((type . message)(subtype . delivery-status)
 494                            (body . visible)))
 495
 496 (ctree-set-calist-strictly
 497  'mime-preview-condition
 498  '((body . visible)
 499    (body-presentation-method . mime-preview-text/plain)))
 500
 501 (ctree-set-calist-strictly
 502  'mime-preview-condition
 503  '((type . nil)
 504    (body . visible)
 505    (body-presentation-method . mime-preview-text/plain)))
 506
 507 (ctree-set-calist-strictly
 508  'mime-preview-condition
 509  '((type . text)(subtype . enriched)
 510    (body . visible)
 511    (body-presentation-method . mime-preview-text/enriched)))
 512
 513 (ctree-set-calist-strictly
 514  'mime-preview-condition
 515  '((type . text)(subtype . richtext)
 516    (body . visible)
 517    (body-presentation-method . mime-preview-text/richtext)))
 518
 519 (ctree-set-calist-strictly
 520  'mime-preview-condition
 521  '((type . text)(subtype . t)
 522    (body . visible)
 523    (body-presentation-method . mime-preview-text/plain)))
 524
 525 (ctree-set-calist-strictly
 526  'mime-preview-condition
 527  '((type . multipart)(subtype . alternative)
 528    (body . visible)
 529    (body-presentation-method . mime-preview-multipart/alternative)))
 530
 531 (ctree-set-calist-strictly
 532  'mime-preview-condition '((type . message)(subtype . partial)
 533                            (body-presentation-method
 534                             . mime-preview-message/partial-button)))
 535
 536 (ctree-set-calist-strictly
 537  'mime-preview-condition '((type . message)(subtype . rfc822)
 538                            (body-presentation-method . nil)
 539                            (childrens-situation (header . visible)
 540                                                 (entity-button . invisible))))
 541
 542 (ctree-set-calist-strictly
 543  'mime-preview-condition '((type . message)(subtype . news)
 544                            (body-presentation-method . nil)
 545                            (childrens-situation (header . visible)
 546                                                 (entity-button . invisible))))
 547
 548
 549 ;;; @@@ entity presentation
 550 ;;;
 551
 552 (autoload 'mime-preview-text/plain "mime-text")
 553 (autoload 'mime-preview-text/enriched "mime-text")
 554 (autoload 'mime-preview-text/richtext "mime-text")
 555
 556 (defvar mime-view-announcement-for-message/partial
 557   (if (and (>= emacs-major-version 19) window-system)
 558       "\
 559 This is message/partial style split message.
 560 Please press `v' key in this buffer or click here by mouse button-2."
 561     "\
 562 This is message/partial style split message.
 563 Please press `v' key in this buffer."
 564     ))
 565
 566 (defun mime-preview-message/partial-button (&optional entity situation)
 567   (save-restriction
 568     (goto-char (point-max))
 569     (if (not (search-backward "\n\n" nil t))
 570         (insert "\n")
 571       )
 572     (goto-char (point-max))
 573     ;;(narrow-to-region (point-max)(point-max))
 574     ;;(insert mime-view-announcement-for-message/partial)
 575     ;; (mime-add-button (point-min)(point-max)
 576     ;;                  #'mime-preview-play-current-entity)
 577     (mime-insert-button mime-view-announcement-for-message/partial
 578                         #'mime-preview-play-current-entity)
 579     ))
 580
 581 (defun mime-preview-multipart/mixed (entity situation)
 582   (let ((children (mime-entity-children entity))
 583         (default-situation
 584           (cdr (assq 'childrens-situation situation))))
 585     (while children
 586       (mime-view-display-entity (car children)
 587                                 (save-excursion
 588                                   (set-buffer (mime-entity-buffer entity))
 589                                   mime-raw-message-info)
 590                                 (current-buffer)
 591                                 default-situation)
 592       (setq children (cdr children))
 593       )))
 594
 595 (defcustom mime-view-type-subtype-score-alist
 596   '(((text . enriched) . 3)
 597     ((text . richtext) . 2)
 598     ((text . plain)    . 1)
 599     (t . 0))
 600   "Alist MEDIA-TYPE vs corresponding score.
 601 MEDIA-TYPE must be (TYPE . SUBTYPE), TYPE or t.  t means default."
 602   :group 'mime-view
 603   :type '(repeat (cons (choice :tag "Media-Type"
 604                                (item :tag "Type/Subtype"
 605                                      (cons symbol symbol))
 606                                (item :tag "Type" symbol)
 607                                (item :tag "Default" t))
 608                        integer)))
 609
 610 (defun mime-preview-multipart/alternative (entity situation)
 611   (let* ((children (mime-entity-children entity))
 612          (default-situation
 613            (cdr (assq 'childrens-situation situation)))
 614          (i 0)
 615          (p 0)
 616          (max-score 0)
 617          (situations
 618           (mapcar (function
 619                    (lambda (child)
 620                      (let ((situation
 621                             (or (ctree-match-calist
 622                                  mime-preview-condition
 623                                  (append (mime-entity-situation child)
 624                                          default-situation))
 625                                 default-situation)))
 626                        (if (cdr (assq 'body-presentation-method situation))
 627                            (let ((score
 628                                   (cdr
 629                                    (or (assoc
 630                                         (cons
 631                                          (cdr (assq 'type situation))
 632                                          (cdr (assq 'subtype situation)))
 633                                         mime-view-type-subtype-score-alist)
 634                                        (assq
 635                                         (cdr (assq 'type situation))
 636                                         mime-view-type-subtype-score-alist)
 637                                        (assq
 638                                         t
 639                                         mime-view-type-subtype-score-alist)
 640                                        ))))
 641                              (if (> score max-score)
 642                                  (setq p i
 643                                        max-score score)
 644                                )))
 645                        (setq i (1+ i))
 646                        situation)
 647                      ))
 648                   children)))
 649     (setq i 0)
 650     (while children
 651       (let ((child (car children))
 652             (situation (car situations)))
 653         (mime-view-display-entity child
 654                                   (save-excursion
 655                                     (set-buffer (mime-entity-buffer child))
 656                                     mime-raw-message-info)
 657                                   (current-buffer)
 658                                   default-situation
 659                                   (if (= i p)
 660                                       situation
 661                                     (del-alist 'body-presentation-method
 662                                                (copy-alist situation))))
 663         )
 664       (setq children (cdr children)
 665             situations (cdr situations)
 666             i (1+ i))
 667       )))
 668
 669
 670 ;;; @ acting-condition
 671 ;;;
 672
 673 (defvar mime-acting-condition nil
 674   "Condition-tree about how to process entity.")
 675
 676 (if (file-readable-p mailcap-file)
 677     (let ((entries (mailcap-parse-file)))
 678       (while entries
 679         (let ((entry (car entries))
 680               view print shared)
 681           (while entry
 682             (let* ((field (car entry))
 683                    (field-type (car field)))
 684               (cond ((eq field-type 'view)  (setq view field))
 685                     ((eq field-type 'print) (setq print field))
 686                     ((memq field-type '(compose composetyped edit)))
 687                     (t (setq shared (cons field shared))))
 688               )
 689             (setq entry (cdr entry))
 690             )
 691           (setq shared (nreverse shared))
 692           (ctree-set-calist-with-default
 693            'mime-acting-condition
 694            (append shared (list '(mode . "play")(cons 'method (cdr view)))))
 695           (if print
 696               (ctree-set-calist-with-default
 697                'mime-acting-condition
 698                (append shared
 699                        (list '(mode . "print")(cons 'method (cdr view))))
 700                ))
 701           )
 702         (setq entries (cdr entries))
 703         )))
 704
 705 (ctree-set-calist-strictly
 706  'mime-acting-condition
 707  '((type . application)(subtype . octet-stream)
 708    (mode . "play")
 709    (method . mime-method-to-detect)
 710    ))
 711
 712 (ctree-set-calist-with-default
 713  'mime-acting-condition
 714  '((mode . "extract")
 715    (method . mime-method-to-save)))
 716
 717 (ctree-set-calist-strictly
 718  'mime-acting-condition
 719  '((type . text)(subtype . x-rot13-47)(mode . "play")
 720    (method . mime-method-to-display-caesar)
 721    ))
 722 (ctree-set-calist-strictly
 723  'mime-acting-condition
 724  '((type . text)(subtype . x-rot13-47-48)(mode . "play")
 725    (method . mime-method-to-display-caesar)
 726    ))
 727
 728 (ctree-set-calist-strictly
 729  'mime-acting-condition
 730  '((type . message)(subtype . rfc822)(mode . "play")
 731    (method . mime-method-to-display-message/rfc822)
 732    ))
 733 (ctree-set-calist-strictly
 734  'mime-acting-condition
 735  '((type . message)(subtype . partial)(mode . "play")
 736    (method . mime-method-to-store-message/partial)
 737    ))
 738
 739 (ctree-set-calist-strictly
 740  'mime-acting-condition
 741  '((type . message)(subtype . external-body)
 742    ("access-type" . "anon-ftp")
 743    (method . mime-method-to-display-message/external-ftp)
 744    ))
 745
 746 (ctree-set-calist-strictly
 747  'mime-acting-condition
 748  '((type . application)(subtype . octet-stream)
 749    (method . mime-method-to-save)
 750    ))
 751
 752
 753 ;;; @ quitting method
 754 ;;;
 755
 756 (defvar mime-preview-quitting-method-alist
 757   '((mime-show-message-mode
 758      . mime-preview-quitting-method-for-mime-show-message-mode))
 759   "Alist of major-mode vs. quitting-method of mime-view.")
 760
 761 (defvar mime-preview-over-to-previous-method-alist nil
 762   "Alist of major-mode vs. over-to-previous-method of mime-view.")
 763
 764 (defvar mime-preview-over-to-next-method-alist nil
 765   "Alist of major-mode vs. over-to-next-method of mime-view.")
 766
 767
 768 ;;; @ following method
 769 ;;;
 770
 771 (defvar mime-view-following-method-alist nil
 772   "Alist of major-mode vs. following-method of mime-view.")
 773
 774 (defvar mime-view-following-required-fields-list
 775   '("From"))
 776
 777
 778 ;;; @ X-Face
 779 ;;;
 780
 781 ;; hack from Gnus 5.0.4.
 782
 783 (defvar mime-view-x-face-to-pbm-command
 784   "{ echo '/* Width=48, Height=48 */'; uncompface; } | icontopbm")
 785
 786 (defvar mime-view-x-face-command
 787   (concat mime-view-x-face-to-pbm-command
 788           " | xv -quit -")
 789   "String to be executed to display an X-Face field.
 790 The command will be executed in a sub-shell asynchronously.
 791 The compressed face will be piped to this command.")
 792
 793 (defun mime-view-x-face-function ()
 794   "Function to display X-Face field. You can redefine to customize."
 795   ;; 1995/10/12 (c.f. tm-eng:130)
 796   ;;    fixed by Eric Ding <ericding@San-Jose.ate.slb.com>
 797   (save-restriction
 798     (narrow-to-region (point-min) (re-search-forward "^$" nil t))
 799     ;; end
 800     (goto-char (point-min))
 801     (if (re-search-forward "^X-Face:[ \t]*" nil t)
 802         (let ((beg (match-end 0))
 803               (end (std11-field-end))
 804               )
 805           (call-process-region beg end "sh" nil 0 nil
 806                                "-c" mime-view-x-face-command)
 807           ))))
 808
 809
 810 ;;; @ buffer setup
 811 ;;;
 812
 813 (defun mime-view-display-entity (entity message-info obuf
 814                                         default-situation
 815                                         &optional situation)
 816   (let* ((raw-buffer (mime-entity-buffer entity))
 817          (start (mime-entity-point-min entity))
 818          (end (mime-entity-point-max entity))
 819          original-major-mode end-of-header e nb ne subj)
 820     (set-buffer raw-buffer)
 821     (setq original-major-mode major-mode)
 822     (goto-char start)
 823     (setq end-of-header (if (re-search-forward "^$" nil t)
 824                             (1+ (match-end 0))
 825                           end))
 826     (if (> end-of-header end)
 827         (setq end-of-header end)
 828       )
 829     (save-restriction
 830       (narrow-to-region start end)
 831       (setq subj (eword-decode-string (mime-raw-get-subject entity)))
 832       )
 833     (or situation
 834         (setq situation
 835               (or (ctree-match-calist mime-preview-condition
 836                                       (append (mime-entity-situation entity)
 837                                               default-situation))
 838                   default-situation)))
 839     (let ((button-is-invisible
 840            (eq (cdr (assq 'entity-button situation)) 'invisible))
 841           (header-is-visible
 842            (eq (cdr (assq 'header situation)) 'visible))
 843           (body-presentation-method
 844            (cdr (assq 'body-presentation-method situation)))
 845           (children (mime-entity-children entity)))
 846       (set-buffer obuf)
 847       (setq nb (point))
 848       (narrow-to-region nb nb)
 849       (or button-is-invisible
 850           (if (mime-view-entity-button-visible-p entity)
 851               (mime-view-insert-entity-button entity subj)
 852             ))
 853       (if header-is-visible
 854           (save-restriction
 855             (narrow-to-region (point)(point))
 856             (insert-buffer-substring raw-buffer start end-of-header)
 857             (let ((f (cdr (assq original-major-mode
 858                                 mime-view-content-header-filter-alist))))
 859               (if (functionp f)
 860                   (funcall f)
 861                 (mime-view-default-content-header-filter)
 862                 ))
 863             (run-hooks 'mime-view-content-header-filter-hook)
 864             ))
 865       (cond ((eq body-presentation-method 'with-filter)
 866              (let ((body-filter (cdr (assq 'body-filter situation))))
 867                (save-restriction
 868                  (narrow-to-region (point-max)(point-max))
 869                  (insert-buffer-substring raw-buffer end-of-header end)
 870                  (funcall body-filter situation)
 871                  )))
 872             (children)
 873             ((functionp body-presentation-method)
 874              (funcall body-presentation-method entity situation)
 875              )
 876             (t
 877              (when button-is-invisible
 878                (goto-char (point-max))
 879                (mime-view-insert-entity-button entity subj)
 880                )
 881              (or header-is-visible
 882                  (progn
 883                    (goto-char (point-max))
 884                    (insert "\n")
 885                    ))
 886              ))
 887       (setq ne (point-max))
 888       (widen)
 889       (put-text-property nb ne 'mime-view-entity entity)
 890       (goto-char ne)
 891       (if children
 892           (if (functionp body-presentation-method)
 893               (funcall body-presentation-method entity situation)
 894             (mime-preview-multipart/mixed entity situation)
 895             ))
 896       )))
 897
 898
 899 ;;; @ MIME viewer mode
 900 ;;;
 901
 902 (defconst mime-view-menu-title "MIME-View")
 903 (defconst mime-view-menu-list
 904   '((up          "Move to upper entity"    mime-preview-move-to-upper)
 905     (previous    "Move to previous entity" mime-preview-move-to-previous)
 906     (next        "Move to next entity"     mime-preview-move-to-next)
 907     (scroll-down "Scroll-down"             mime-preview-scroll-down-entity)
 908     (scroll-up   "Scroll-up"               mime-preview-scroll-up-entity)
 909     (play        "Play current entity"     mime-preview-play-current-entity)
 910     (extract     "Extract current entity"  mime-preview-extract-current-entity)
 911     (print       "Print current entity"    mime-preview-print-current-entity)
 912     (x-face      "Show X Face"             mime-preview-display-x-face)
 913     )
 914   "Menu for MIME Viewer")
 915
 916 (cond (running-xemacs
 917        (defvar mime-view-xemacs-popup-menu
 918          (cons mime-view-menu-title
 919                (mapcar (function
 920                         (lambda (item)
 921                           (vector (nth 1 item)(nth 2 item) t)
 922                           ))
 923                        mime-view-menu-list)))
 924        (defun mime-view-xemacs-popup-menu (event)
 925          "Popup the menu in the MIME Viewer buffer"
 926          (interactive "e")
 927          (select-window (event-window event))
 928          (set-buffer (event-buffer event))
 929          (popup-menu 'mime-view-xemacs-popup-menu))
 930        (defvar mouse-button-2 'button2)
 931        )
 932       (t
 933        (defvar mouse-button-2 [mouse-2])
 934        ))
 935
 936 (defun mime-view-define-keymap (&optional default)
 937   (let ((mime-view-mode-map (if (keymapp default)
 938                                 (copy-keymap default)
 939                               (make-sparse-keymap)
 940                               )))
 941     (define-key mime-view-mode-map
 942       "u"        (function mime-preview-move-to-upper))
 943     (define-key mime-view-mode-map
 944       "p"        (function mime-preview-move-to-previous))
 945     (define-key mime-view-mode-map
 946       "n"        (function mime-preview-move-to-next))
 947     (define-key mime-view-mode-map
 948       "\e\t"     (function mime-preview-move-to-previous))
 949     (define-key mime-view-mode-map
 950       "\t"       (function mime-preview-move-to-next))
 951     (define-key mime-view-mode-map
 952       " "        (function mime-preview-scroll-up-entity))
 953     (define-key mime-view-mode-map
 954       "\M- "     (function mime-preview-scroll-down-entity))
 955     (define-key mime-view-mode-map
 956       "\177"     (function mime-preview-scroll-down-entity))
 957     (define-key mime-view-mode-map
 958       "\C-m"     (function mime-preview-next-line-entity))
 959     (define-key mime-view-mode-map
 960       "\C-\M-m"  (function mime-preview-previous-line-entity))
 961     (define-key mime-view-mode-map
 962       "v"        (function mime-preview-play-current-entity))
 963     (define-key mime-view-mode-map
 964       "e"        (function mime-preview-extract-current-entity))
 965     (define-key mime-view-mode-map
 966       "\C-c\C-p" (function mime-preview-print-current-entity))
 967     (define-key mime-view-mode-map
 968       "a"        (function mime-preview-follow-current-entity))
 969     (define-key mime-view-mode-map
 970       "q"        (function mime-preview-quit))
 971     (define-key mime-view-mode-map
 972       "\C-c\C-x" (function mime-preview-kill-buffer))
 973     ;; (define-key mime-view-mode-map
 974     ;;   "<"        (function beginning-of-buffer))
 975     ;; (define-key mime-view-mode-map
 976     ;;   ">"        (function end-of-buffer))
 977     (define-key mime-view-mode-map
 978       "?"        (function describe-mode))
 979     (define-key mime-view-mode-map
 980       [tab] (function mime-preview-move-to-next))
 981     (define-key mime-view-mode-map
 982       [delete] (function mime-preview-scroll-down-entity))
 983     (define-key mime-view-mode-map
 984       [backspace] (function mime-preview-scroll-down-entity))
 985     (if (functionp default)
 986         (cond (running-xemacs
 987                (set-keymap-default-binding mime-view-mode-map default)
 988                )
 989               (t
 990                (setq mime-view-mode-map
 991                      (append mime-view-mode-map (list (cons t default))))
 992                )))
 993     (if mouse-button-2
 994         (define-key mime-view-mode-map
 995           mouse-button-2 (function mime-button-dispatcher))
 996       )
 997     (cond (running-xemacs
 998            (define-key mime-view-mode-map
 999              mouse-button-3 (function mime-view-xemacs-popup-menu))
1000            )
1001           ((>= emacs-major-version 19)
1002            (define-key mime-view-mode-map [menu-bar mime-view]
1003              (cons mime-view-menu-title
1004                    (make-sparse-keymap mime-view-menu-title)))
1005            (mapcar (function
1006                     (lambda (item)
1007                       (define-key mime-view-mode-map
1008                         (vector 'menu-bar 'mime-view (car item))
1009                         (cons (nth 1 item)(nth 2 item))
1010                         )
1011                       ))
1012                    (reverse mime-view-menu-list)
1013                    )
1014            ))
1015     (use-local-map mime-view-mode-map)
1016     (run-hooks 'mime-view-define-keymap-hook)
1017     ))
1018
1019 (defsubst mime-maybe-hide-echo-buffer ()
1020   "Clear mime-echo buffer and delete window for it."
1021   (let ((buf (get-buffer mime-echo-buffer-name)))
1022     (if buf
1023         (save-excursion
1024           (set-buffer buf)
1025           (erase-buffer)
1026           (let ((win (get-buffer-window buf)))
1027             (if win
1028                 (delete-window win)
1029               ))
1030           (bury-buffer buf)
1031           ))))
1032
1033 (defvar mime-view-redisplay nil)
1034
1035 (defun mime-view-display-message (message &optional preview-buffer
1036                                           mother default-keymap-or-function)
1037   (mime-maybe-hide-echo-buffer)
1038   (let ((win-conf (current-window-configuration))
1039         (raw-buffer (mime-entity-buffer message)))
1040     (or preview-buffer
1041         (setq preview-buffer
1042               (concat "*Preview-" (buffer-name raw-buffer) "*")))
1043     (set-buffer raw-buffer)
1044     (setq mime-raw-message-info (mime-parse-message))
1045     (setq mime-preview-buffer preview-buffer)
1046     (let ((inhibit-read-only t))
1047       (switch-to-buffer preview-buffer)
1048       (widen)
1049       (erase-buffer)
1050       (setq mime-raw-buffer raw-buffer)
1051       (if mother
1052           (setq mime-mother-buffer mother)
1053         )
1054       (setq mime-preview-original-window-configuration win-conf)
1055       (setq major-mode 'mime-view-mode)
1056       (setq mode-name "MIME-View")
1057       (mime-view-display-entity message message
1058                                 preview-buffer
1059                                 '((entity-button . invisible)
1060                                   (header . visible)
1061                                   ))
1062       (mime-view-define-keymap default-keymap-or-function)
1063       (let ((point
1064              (next-single-property-change (point-min) 'mime-view-entity)))
1065         (if point
1066             (goto-char point)
1067           (goto-char (point-min))
1068           (search-forward "\n\n" nil t)
1069           ))
1070       (run-hooks 'mime-view-mode-hook)
1071       ))
1072   (set-buffer-modified-p nil)
1073   (setq buffer-read-only t)
1074   )
1075
1076 (defun mime-view-buffer (&optional raw-buffer preview-buffer mother
1077                                    default-keymap-or-function)
1078   (interactive)
1079   (mime-view-display-message
1080    (save-excursion
1081      (if raw-buffer (set-buffer raw-buffer))
1082      (mime-parse-message)
1083      )
1084    preview-buffer mother default-keymap-or-function))
1085
1086 (defun mime-view-mode (&optional mother ctl encoding
1087                                  raw-buffer preview-buffer
1088                                  default-keymap-or-function)
1089   "Major mode for viewing MIME message.
1090
1091 Here is a list of the standard keys for mime-view-mode.
1092
1093 key             feature
1094 ---             -------
1095
1096 u               Move to upper content
1097 p or M-TAB      Move to previous content
1098 n or TAB        Move to next content
1099 SPC             Scroll up or move to next content
1100 M-SPC or DEL    Scroll down or move to previous content
1101 RET             Move to next line
1102 M-RET           Move to previous line
1103 v               Decode current content as `play mode'
1104 e               Decode current content as `extract mode'
1105 C-c C-p         Decode current content as `print mode'
1106 a               Followup to current content.
1107 q               Quit
1108 button-2        Move to point under the mouse cursor
1109                 and decode current content as `play mode'
1110 "
1111   (interactive)
1112   (mime-view-display-message
1113    (save-excursion
1114      (if raw-buffer (set-buffer raw-buffer))
1115      (or mime-view-redisplay
1116          (mime-parse-message ctl encoding))
1117      )
1118    preview-buffer mother default-keymap-or-function))
1119
1120
1121 ;;; @@ playing
1122 ;;;
1123
1124 (autoload 'mime-preview-play-current-entity "mime-play"
1125   "Play current entity." t)
1126
1127 (defun mime-preview-extract-current-entity ()
1128   "Extract current entity into file (maybe).
1129 It decodes current entity to call internal or external method as
1130 \"extract\" mode.  The method is selected from variable
1131 `mime-acting-condition'."
1132   (interactive)
1133   (mime-preview-play-current-entity "extract")
1134   )
1135
1136 (defun mime-preview-print-current-entity ()
1137   "Print current entity (maybe).
1138 It decodes current entity to call internal or external method as
1139 \"print\" mode.  The method is selected from variable
1140 `mime-acting-condition'."
1141   (interactive)
1142   (mime-preview-play-current-entity "print")
1143   )
1144
1145
1146 ;;; @@ following
1147 ;;;
1148
1149 (defun mime-preview-follow-current-entity ()
1150   "Write follow message to current entity.
1151 It calls following-method selected from variable
1152 `mime-view-following-method-alist'."
1153   (interactive)
1154   (let (entity)
1155     (while (null (setq entity
1156                        (get-text-property (point) 'mime-view-entity)))
1157       (backward-char)
1158       )
1159     (let* ((p-beg
1160             (previous-single-property-change (point) 'mime-view-entity))
1161            p-end
1162            (entity-node-id (mime-entity-node-id entity))
1163            (len (length entity-node-id))
1164            )
1165       (cond ((null p-beg)
1166              (setq p-beg
1167                    (if (eq (next-single-property-change (point-min)
1168                                                         'mime-view-entity)
1169                            (point))
1170                        (point)
1171                      (point-min)))
1172              )
1173             ((eq (next-single-property-change p-beg 'mime-view-entity)
1174                  (point))
1175              (setq p-beg (point))
1176              ))
1177       (setq p-end (next-single-property-change p-beg 'mime-view-entity))
1178       (cond ((null p-end)
1179              (setq p-end (point-max))
1180              )
1181             ((null entity-node-id)
1182              (setq p-end (point-max))
1183              )
1184             (t
1185              (save-excursion
1186                (goto-char p-end)
1187                (catch 'tag
1188                  (let (e)
1189                    (while (setq e
1190                                 (next-single-property-change
1191                                  (point) 'mime-view-entity))
1192                      (goto-char e)
1193                      (let ((rc (mime-entity-node-id
1194                                 (get-text-property (point)
1195                                                    'mime-view-entity))))
1196                        (or (equal entity-node-id
1197                                   (nthcdr (- (length rc) len) rc))
1198                            (throw 'tag nil)
1199                            ))
1200                      (setq p-end e)
1201                      ))
1202                  (setq p-end (point-max))
1203                  ))
1204              ))
1205       (let* ((mode (mime-preview-original-major-mode 'recursive))
1206              (new-name
1207               (format "%s-%s" (buffer-name) (reverse entity-node-id)))
1208              new-buf
1209              (the-buf (current-buffer))
1210              (a-buf mime-raw-buffer)
1211              fields)
1212         (save-excursion
1213           (set-buffer (setq new-buf (get-buffer-create new-name)))
1214           (erase-buffer)
1215           (insert-buffer-substring the-buf p-beg p-end)
1216           (goto-char (point-min))
1217           (let ((entity-node-id (mime-entity-node-id entity)) ci str)
1218             (while (progn
1219                      (setq
1220                       str
1221                       (save-excursion
1222                         (set-buffer a-buf)
1223                         (setq
1224                          ci
1225                          (mime-raw-find-entity-from-node-id entity-node-id))
1226                         (save-restriction
1227                           (narrow-to-region
1228                            (mime-entity-point-min ci)
1229                            (mime-entity-point-max ci)
1230                            )
1231                           (std11-header-string-except
1232                            (concat "^"
1233                                    (apply (function regexp-or) fields)
1234                                    ":") ""))))
1235                      (if (and
1236                           (eq (mime-entity-media-type ci) 'message)
1237                           (eq (mime-entity-media-subtype ci) 'rfc822))
1238                          nil
1239                        (if str
1240                            (insert str)
1241                          )
1242                        entity-node-id))
1243               (setq fields (std11-collect-field-names)
1244                     entity-node-id (cdr entity-node-id))
1245               )
1246             )
1247           (let ((rest mime-view-following-required-fields-list))
1248             (while rest
1249               (let ((field-name (car rest)))
1250                 (or (std11-field-body field-name)
1251                     (insert
1252                      (format
1253                       (concat field-name
1254                               ": "
1255                               (save-excursion
1256                                 (set-buffer the-buf)
1257                                 (set-buffer mime-mother-buffer)
1258                                 (set-buffer mime-raw-buffer)
1259                                 (std11-field-body field-name)
1260                                 )
1261                               "\n")))
1262                     ))
1263               (setq rest (cdr rest))
1264               ))
1265           (eword-decode-header)
1266           )
1267         (let ((f (cdr (assq mode mime-view-following-method-alist))))
1268           (if (functionp f)
1269               (funcall f new-buf)
1270             (message
1271              (format
1272               "Sorry, following method for %s is not implemented yet."
1273               mode))
1274             ))
1275         ))))
1276
1277
1278 ;;; @@ X-Face
1279 ;;;
1280
1281 (defun mime-preview-display-x-face ()
1282   (interactive)
1283   (save-window-excursion
1284     (set-buffer mime-raw-buffer)
1285     (mime-view-x-face-function)
1286     ))
1287
1288
1289 ;;; @@ moving
1290 ;;;
1291
1292 (defun mime-preview-move-to-upper ()
1293   "Move to upper entity.
1294 If there is no upper entity, call function `mime-preview-quit'."
1295   (interactive)
1296   (let (cinfo)
1297     (while (null (setq cinfo
1298                        (get-text-property (point) 'mime-view-entity)))
1299       (backward-char)
1300       )
1301     (let ((r (mime-raw-find-entity-from-node-id
1302               (cdr (mime-entity-node-id cinfo))
1303               (get-text-property 1 'mime-view-entity)))
1304           point)
1305       (catch 'tag
1306         (while (setq point (previous-single-property-change
1307                             (point) 'mime-view-entity))
1308           (goto-char point)
1309           (if (eq r (get-text-property (point) 'mime-view-entity))
1310               (throw 'tag t)
1311             )
1312           )
1313         (mime-preview-quit)
1314         ))))
1315
1316 (defun mime-preview-move-to-previous ()
1317   "Move to previous entity.
1318 If there is no previous entity, it calls function registered in
1319 variable `mime-preview-over-to-previous-method-alist'."
1320   (interactive)
1321   (while (null (get-text-property (point) 'mime-view-entity))
1322     (backward-char)
1323     )
1324   (let ((point (previous-single-property-change (point) 'mime-view-entity)))
1325     (if point
1326         (if (get-text-property (1- point) 'mime-view-entity)
1327             (goto-char point)
1328           (goto-char (1- point))
1329           (mime-preview-move-to-previous)
1330           )
1331       (let ((f (assq (mime-preview-original-major-mode)
1332                      mime-preview-over-to-previous-method-alist)))
1333         (if f
1334             (funcall (cdr f))
1335           ))
1336       )))
1337
1338 (defun mime-preview-move-to-next ()
1339   "Move to next entity.
1340 If there is no previous entity, it calls function registered in
1341 variable `mime-preview-over-to-next-method-alist'."
1342   (interactive)
1343   (while (null (get-text-property (point) 'mime-view-entity))
1344     (forward-char)
1345     )
1346   (let ((point (next-single-property-change (point) 'mime-view-entity)))
1347     (if point
1348         (progn
1349           (goto-char point)
1350           (if (null (get-text-property point 'mime-view-entity))
1351               (mime-preview-move-to-next)
1352             ))
1353       (let ((f (assq (mime-preview-original-major-mode)
1354                      mime-preview-over-to-next-method-alist)))
1355         (if f
1356             (funcall (cdr f))
1357           ))
1358       )))
1359
1360 (defun mime-preview-scroll-up-entity (&optional h)
1361   "Scroll up current entity.
1362 If reached to (point-max), it calls function registered in variable
1363 `mime-preview-over-to-next-method-alist'."
1364   (interactive)
1365   (or h
1366       (setq h (1- (window-height)))
1367       )
1368   (if (= (point) (point-max))
1369       (let ((f (assq (mime-preview-original-major-mode)
1370                      mime-preview-over-to-next-method-alist)))
1371         (if f
1372             (funcall (cdr f))
1373           ))
1374     (let ((point
1375            (or (next-single-property-change (point) 'mime-view-entity)
1376                (point-max))))
1377       (forward-line h)
1378       (if (> (point) point)
1379           (goto-char point)
1380         )
1381       )))
1382
1383 (defun mime-preview-scroll-down-entity (&optional h)
1384   "Scroll down current entity.
1385 If reached to (point-min), it calls function registered in variable
1386 `mime-preview-over-to-previous-method-alist'."
1387   (interactive)
1388   (or h
1389       (setq h (1- (window-height)))
1390       )
1391   (if (= (point) (point-min))
1392       (let ((f (assq (mime-preview-original-major-mode)
1393                      mime-preview-over-to-previous-method-alist)))
1394         (if f
1395             (funcall (cdr f))
1396           ))
1397     (let ((point
1398            (or (previous-single-property-change (point) 'mime-view-entity)
1399                (point-min))))
1400       (forward-line (- h))
1401       (if (< (point) point)
1402           (goto-char point)
1403         ))))
1404
1405 (defun mime-preview-next-line-entity ()
1406   (interactive)
1407   (mime-preview-scroll-up-entity 1)
1408   )
1409
1410 (defun mime-preview-previous-line-entity ()
1411   (interactive)
1412   (mime-preview-scroll-down-entity 1)
1413   )
1414
1415
1416 ;;; @@ quitting
1417 ;;;
1418
1419 (defun mime-preview-quit ()
1420   "Quit from MIME-preview buffer.
1421 It calls function registered in variable
1422 `mime-preview-quitting-method-alist'."
1423   (interactive)
1424   (let ((r (assq (mime-preview-original-major-mode)
1425                  mime-preview-quitting-method-alist)))
1426     (if r
1427         (funcall (cdr r))
1428       )))
1429
1430 (defun mime-preview-kill-buffer ()
1431   (interactive)
1432   (kill-buffer (current-buffer))
1433   )
1434
1435
1436 ;;; @ end
1437 ;;;
1438
1439 (provide 'mime-view)
1440
1441 (run-hooks 'mime-view-load-hook)
1442
1443 ;;; mime-view.el ends here