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 SEMI (Sophisticated 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          ]]
 561 \[[ or click here by mouse button-2.             ]]"
 562     "\
 563 \[[ This is message/partial style split message. ]]
 564 \[[ Please press `v' key in this buffer.         ]]"
 565     ))
 566
 567 (defun mime-preview-message/partial-button (&optional entity situation)
 568   (save-restriction
 569     (goto-char (point-max))
 570     (if (not (search-backward "\n\n" nil t))
 571         (insert "\n")
 572       )
 573     (goto-char (point-max))
 574     (narrow-to-region (point-max)(point-max))
 575     (insert mime-view-announcement-for-message/partial)
 576     (mime-add-button (point-min)(point-max)
 577                      #'mime-preview-play-current-entity)
 578     ))
 579
 580 (defun mime-preview-multipart/mixed (entity situation)
 581   (let ((children (mime-entity-children entity))
 582         (default-situation
 583           (cdr (assq 'childrens-situation situation))))
 584     (while children
 585       (mime-view-display-entity (car children)
 586                                 (save-excursion
 587                                   (set-buffer (mime-entity-buffer entity))
 588                                   mime-raw-message-info)
 589                                 (current-buffer)
 590                                 default-situation)
 591       (setq children (cdr children))
 592       )))
 593
 594 (defcustom mime-view-type-subtype-score-alist
 595   '(((text . enriched) . 3)
 596     ((text . richtext) . 2)
 597     ((text . plain)    . 1)
 598     (t . 0))
 599   "Alist MEDIA-TYPE vs corresponding score.
 600 MEDIA-TYPE must be (TYPE . SUBTYPE), TYPE or t.  t means default."
 601   :group 'mime-view
 602   :type '(repeat (cons (choice :tag "Media-Type"
 603                                (item :tag "Type/Subtype"
 604                                      (cons symbol symbol))
 605                                (item :tag "Type" symbol)
 606                                (item :tag "Default" t))
 607                        integer)))
 608
 609 (defun mime-preview-multipart/alternative (entity situation)
 610   (let* ((children (mime-entity-children entity))
 611          (default-situation
 612            (cdr (assq 'childrens-situation situation)))
 613          (i 0)
 614          (p 0)
 615          (max-score 0)
 616          (situations
 617           (mapcar (function
 618                    (lambda (child)
 619                      (let ((situation
 620                             (or (ctree-match-calist
 621                                  mime-preview-condition
 622                                  (append (mime-entity-situation child)
 623                                          default-situation))
 624                                 default-situation)))
 625                        (if (cdr (assq 'body-presentation-method situation))
 626                            (let ((score
 627                                   (cdr
 628                                    (or (assoc
 629                                         (cons
 630                                          (cdr (assq 'type situation))
 631                                          (cdr (assq 'subtype situation)))
 632                                         mime-view-type-subtype-score-alist)
 633                                        (assq
 634                                         (cdr (assq 'type situation))
 635                                         mime-view-type-subtype-score-alist)
 636                                        (assq
 637                                         t
 638                                         mime-view-type-subtype-score-alist)
 639                                        ))))
 640                              (if (> score max-score)
 641                                  (setq p i
 642                                        max-score score)
 643                                )))
 644                        (setq i (1+ i))
 645                        situation)
 646                      ))
 647                   children)))
 648     (setq i 0)
 649     (while children
 650       (let ((child (car children))
 651             (situation (car situations)))
 652         (mime-view-display-entity child
 653                                   (save-excursion
 654                                     (set-buffer (mime-entity-buffer child))
 655                                     mime-raw-message-info)
 656                                   (current-buffer)
 657                                   default-situation
 658                                   (if (= i p)
 659                                       situation
 660                                     (del-alist 'body-presentation-method
 661                                                (copy-alist situation))))
 662         )
 663       (setq children (cdr children)
 664             situations (cdr situations)
 665             i (1+ i))
 666       )))
 667
 668
 669 ;;; @ acting-condition
 670 ;;;
 671
 672 (defvar mime-acting-condition nil
 673   "Condition-tree about how to process entity.")
 674
 675 (if (file-readable-p mailcap-file)
 676     (let ((entries (mailcap-parse-file)))
 677       (while entries
 678         (let ((entry (car entries))
 679               view print shared)
 680           (while entry
 681             (let* ((field (car entry))
 682                    (field-type (car field)))
 683               (cond ((eq field-type 'view)  (setq view field))
 684                     ((eq field-type 'print) (setq print field))
 685                     ((memq field-type '(compose composetyped edit)))
 686                     (t (setq shared (cons field shared))))
 687               )
 688             (setq entry (cdr entry))
 689             )
 690           (setq shared (nreverse shared))
 691           (ctree-set-calist-with-default
 692            'mime-acting-condition
 693            (append shared (list '(mode . "play")(cons 'method (cdr view)))))
 694           (if print
 695               (ctree-set-calist-with-default
 696                'mime-acting-condition
 697                (append shared
 698                        (list '(mode . "print")(cons 'method (cdr view))))
 699                ))
 700           )
 701         (setq entries (cdr entries))
 702         )))
 703
 704 (ctree-set-calist-strictly
 705  'mime-acting-condition
 706  '((type . application)(subtype . octet-stream)
 707    (mode . "play")
 708    (method . mime-method-to-detect)
 709    ))
 710
 711 (ctree-set-calist-with-default
 712  'mime-acting-condition
 713  '((mode . "extract")
 714    (method . mime-method-to-save)))
 715
 716 (ctree-set-calist-strictly
 717  'mime-acting-condition
 718  '((type . text)(subtype . x-rot13-47)(mode . "play")
 719    (method . mime-method-to-display-caesar)
 720    ))
 721 (ctree-set-calist-strictly
 722  'mime-acting-condition
 723  '((type . text)(subtype . x-rot13-47-48)(mode . "play")
 724    (method . mime-method-to-display-caesar)
 725    ))
 726
 727 (ctree-set-calist-strictly
 728  'mime-acting-condition
 729  '((type . message)(subtype . rfc822)(mode . "play")
 730    (method . mime-method-to-display-message/rfc822)
 731    ))
 732 (ctree-set-calist-strictly
 733  'mime-acting-condition
 734  '((type . message)(subtype . partial)(mode . "play")
 735    (method . mime-method-to-store-message/partial)
 736    ))
 737
 738 (ctree-set-calist-strictly
 739  'mime-acting-condition
 740  '((type . message)(subtype . external-body)
 741    ("access-type" . "anon-ftp")
 742    (method . mime-method-to-display-message/external-ftp)
 743    ))
 744
 745 (ctree-set-calist-strictly
 746  'mime-acting-condition
 747  '((type . application)(subtype . octet-stream)
 748    (method . mime-method-to-save)
 749    ))
 750
 751
 752 ;;; @ quitting method
 753 ;;;
 754
 755 (defvar mime-preview-quitting-method-alist
 756   '((mime-show-message-mode
 757      . mime-preview-quitting-method-for-mime-show-message-mode))
 758   "Alist of major-mode vs. quitting-method of mime-view.")
 759
 760 (defvar mime-preview-over-to-previous-method-alist nil
 761   "Alist of major-mode vs. over-to-previous-method of mime-view.")
 762
 763 (defvar mime-preview-over-to-next-method-alist nil
 764   "Alist of major-mode vs. over-to-next-method of mime-view.")
 765
 766
 767 ;;; @ following method
 768 ;;;
 769
 770 (defvar mime-view-following-method-alist nil
 771   "Alist of major-mode vs. following-method of mime-view.")
 772
 773 (defvar mime-view-following-required-fields-list
 774   '("From"))
 775
 776
 777 ;;; @ X-Face
 778 ;;;
 779
 780 ;; hack from Gnus 5.0.4.
 781
 782 (defvar mime-view-x-face-to-pbm-command
 783   "{ echo '/* Width=48, Height=48 */'; uncompface; } | icontopbm")
 784
 785 (defvar mime-view-x-face-command
 786   (concat mime-view-x-face-to-pbm-command
 787           " | xv -quit -")
 788   "String to be executed to display an X-Face field.
 789 The command will be executed in a sub-shell asynchronously.
 790 The compressed face will be piped to this command.")
 791
 792 (defun mime-view-x-face-function ()
 793   "Function to display X-Face field. You can redefine to customize."
 794   ;; 1995/10/12 (c.f. tm-eng:130)
 795   ;;    fixed by Eric Ding <ericding@San-Jose.ate.slb.com>
 796   (save-restriction
 797     (narrow-to-region (point-min) (re-search-forward "^$" nil t))
 798     ;; end
 799     (goto-char (point-min))
 800     (if (re-search-forward "^X-Face:[ \t]*" nil t)
 801         (let ((beg (match-end 0))
 802               (end (std11-field-end))
 803               )
 804           (call-process-region beg end "sh" nil 0 nil
 805                                "-c" mime-view-x-face-command)
 806           ))))
 807
 808
 809 ;;; @ buffer setup
 810 ;;;
 811
 812 (defun mime-view-display-entity (entity message-info obuf
 813                                         default-situation
 814                                         &optional situation)
 815   (let* ((raw-buffer (mime-entity-buffer entity))
 816          (start (mime-entity-point-min entity))
 817          (end (mime-entity-point-max entity))
 818          original-major-mode end-of-header e nb ne subj)
 819     (set-buffer raw-buffer)
 820     (setq original-major-mode major-mode)
 821     (goto-char start)
 822     (setq end-of-header (if (re-search-forward "^$" nil t)
 823                             (1+ (match-end 0))
 824                           end))
 825     (if (> end-of-header end)
 826         (setq end-of-header end)
 827       )
 828     (save-restriction
 829       (narrow-to-region start end)
 830       (setq subj (eword-decode-string (mime-raw-get-subject entity)))
 831       )
 832     (or situation
 833         (setq situation
 834               (or (ctree-match-calist mime-preview-condition
 835                                       (append (mime-entity-situation entity)
 836                                               default-situation))
 837                   default-situation)))
 838     (let ((button-is-invisible
 839            (eq (cdr (assq 'entity-button situation)) 'invisible))
 840           (header-is-visible
 841            (eq (cdr (assq 'header situation)) 'visible))
 842           (body-presentation-method
 843            (cdr (assq 'body-presentation-method situation)))
 844           (children (mime-entity-children entity)))
 845       (set-buffer obuf)
 846       (setq nb (point))
 847       (narrow-to-region nb nb)
 848       (or button-is-invisible
 849           (if (mime-view-entity-button-visible-p entity)
 850               (mime-view-insert-entity-button entity subj)
 851             ))
 852       (if header-is-visible
 853           (save-restriction
 854             (narrow-to-region (point)(point))
 855             (insert-buffer-substring raw-buffer start end-of-header)
 856             (let ((f (cdr (assq original-major-mode
 857                                 mime-view-content-header-filter-alist))))
 858               (if (functionp f)
 859                   (funcall f)
 860                 (mime-view-default-content-header-filter)
 861                 ))
 862             (run-hooks 'mime-view-content-header-filter-hook)
 863             ))
 864       (cond ((eq body-presentation-method 'with-filter)
 865              (let ((body-filter (cdr (assq 'body-filter situation))))
 866                (save-restriction
 867                  (narrow-to-region (point-max)(point-max))
 868                  (insert-buffer-substring raw-buffer end-of-header end)
 869                  (funcall body-filter situation)
 870                  )))
 871             (children)
 872             ((functionp body-presentation-method)
 873              (funcall body-presentation-method entity situation)
 874              )
 875             (t
 876              (when button-is-invisible
 877                (goto-char (point-max))
 878                (mime-view-insert-entity-button entity subj)
 879                )
 880              (or header-is-visible
 881                  (progn
 882                    (goto-char (point-max))
 883                    (insert "\n")
 884                    ))
 885              ))
 886       (setq ne (point-max))
 887       (widen)
 888       (put-text-property nb ne 'mime-view-entity entity)
 889       (goto-char ne)
 890       (if children
 891           (if (functionp body-presentation-method)
 892               (funcall body-presentation-method entity situation)
 893             (mime-preview-multipart/mixed entity situation)
 894             ))
 895       )))
 896
 897
 898 ;;; @ MIME viewer mode
 899 ;;;
 900
 901 (defconst mime-view-menu-title "MIME-View")
 902 (defconst mime-view-menu-list
 903   '((up          "Move to upper entity"    mime-preview-move-to-upper)
 904     (previous    "Move to previous entity" mime-preview-move-to-previous)
 905     (next        "Move to next entity"     mime-preview-move-to-next)
 906     (scroll-down "Scroll-down"             mime-preview-scroll-down-entity)
 907     (scroll-up   "Scroll-up"               mime-preview-scroll-up-entity)
 908     (play        "Play current entity"     mime-preview-play-current-entity)
 909     (extract     "Extract current entity"  mime-preview-extract-current-entity)
 910     (print       "Print current entity"    mime-preview-print-current-entity)
 911     (x-face      "Show X Face"             mime-preview-display-x-face)
 912     )
 913   "Menu for MIME Viewer")
 914
 915 (cond (running-xemacs
 916        (defvar mime-view-xemacs-popup-menu
 917          (cons mime-view-menu-title
 918                (mapcar (function
 919                         (lambda (item)
 920                           (vector (nth 1 item)(nth 2 item) t)
 921                           ))
 922                        mime-view-menu-list)))
 923        (defun mime-view-xemacs-popup-menu (event)
 924          "Popup the menu in the MIME Viewer buffer"
 925          (interactive "e")
 926          (select-window (event-window event))
 927          (set-buffer (event-buffer event))
 928          (popup-menu 'mime-view-xemacs-popup-menu))
 929        (defvar mouse-button-2 'button2)
 930        )
 931       (t
 932        (defvar mouse-button-2 [mouse-2])
 933        ))
 934
 935 (defun mime-view-define-keymap (&optional default)
 936   (let ((mime-view-mode-map (if (keymapp default)
 937                                 (copy-keymap default)
 938                               (make-sparse-keymap)
 939                               )))
 940     (define-key mime-view-mode-map
 941       "u"        (function mime-preview-move-to-upper))
 942     (define-key mime-view-mode-map
 943       "p"        (function mime-preview-move-to-previous))
 944     (define-key mime-view-mode-map
 945       "n"        (function mime-preview-move-to-next))
 946     (define-key mime-view-mode-map
 947       "\e\t"     (function mime-preview-move-to-previous))
 948     (define-key mime-view-mode-map
 949       "\t"       (function mime-preview-move-to-next))
 950     (define-key mime-view-mode-map
 951       " "        (function mime-preview-scroll-up-entity))
 952     (define-key mime-view-mode-map
 953       "\M- "     (function mime-preview-scroll-down-entity))
 954     (define-key mime-view-mode-map
 955       "\177"     (function mime-preview-scroll-down-entity))
 956     (define-key mime-view-mode-map
 957       "\C-m"     (function mime-preview-next-line-entity))
 958     (define-key mime-view-mode-map
 959       "\C-\M-m"  (function mime-preview-previous-line-entity))
 960     (define-key mime-view-mode-map
 961       "v"        (function mime-preview-play-current-entity))
 962     (define-key mime-view-mode-map
 963       "e"        (function mime-preview-extract-current-entity))
 964     (define-key mime-view-mode-map
 965       "\C-c\C-p" (function mime-preview-print-current-entity))
 966     (define-key mime-view-mode-map
 967       "a"        (function mime-preview-follow-current-entity))
 968     (define-key mime-view-mode-map
 969       "q"        (function mime-preview-quit))
 970     (define-key mime-view-mode-map
 971       "\C-c\C-x" (function mime-preview-kill-buffer))
 972     ;; (define-key mime-view-mode-map
 973     ;;   "<"        (function beginning-of-buffer))
 974     ;; (define-key mime-view-mode-map
 975     ;;   ">"        (function end-of-buffer))
 976     (define-key mime-view-mode-map
 977       "?"        (function describe-mode))
 978     (define-key mime-view-mode-map
 979       [tab] (function mime-preview-move-to-next))
 980     (define-key mime-view-mode-map
 981       [delete] (function mime-preview-scroll-down-entity))
 982     (define-key mime-view-mode-map
 983       [backspace] (function mime-preview-scroll-down-entity))
 984     (if (functionp default)
 985         (cond (running-xemacs
 986                (set-keymap-default-binding mime-view-mode-map default)
 987                )
 988               (t
 989                (setq mime-view-mode-map
 990                      (append mime-view-mode-map (list (cons t default))))
 991                )))
 992     (if mouse-button-2
 993         (define-key mime-view-mode-map
 994           mouse-button-2 (function mime-button-dispatcher))
 995       )
 996     (cond (running-xemacs
 997            (define-key mime-view-mode-map
 998              mouse-button-3 (function mime-view-xemacs-popup-menu))
 999            )
1000           ((>= emacs-major-version 19)
1001            (define-key mime-view-mode-map [menu-bar mime-view]
1002              (cons mime-view-menu-title
1003                    (make-sparse-keymap mime-view-menu-title)))
1004            (mapcar (function
1005                     (lambda (item)
1006                       (define-key mime-view-mode-map
1007                         (vector 'menu-bar 'mime-view (car item))
1008                         (cons (nth 1 item)(nth 2 item))
1009                         )
1010                       ))
1011                    (reverse mime-view-menu-list)
1012                    )
1013            ))
1014     (use-local-map mime-view-mode-map)
1015     (run-hooks 'mime-view-define-keymap-hook)
1016     ))
1017
1018 (defsubst mime-maybe-hide-echo-buffer ()
1019   "Clear mime-echo buffer and delete window for it."
1020   (let ((buf (get-buffer mime-echo-buffer-name)))
1021     (if buf
1022         (save-excursion
1023           (set-buffer buf)
1024           (erase-buffer)
1025           (let ((win (get-buffer-window buf)))
1026             (if win
1027                 (delete-window win)
1028               ))
1029           (bury-buffer buf)
1030           ))))
1031
1032 (defvar mime-view-redisplay nil)
1033
1034 (defun mime-view-display-message (message &optional preview-buffer
1035                                           mother default-keymap-or-function)
1036   (mime-maybe-hide-echo-buffer)
1037   (let ((win-conf (current-window-configuration))
1038         (raw-buffer (mime-entity-buffer message)))
1039     (or preview-buffer
1040         (setq preview-buffer
1041               (concat "*Preview-" (buffer-name raw-buffer) "*")))
1042     (set-buffer raw-buffer)
1043     (setq mime-raw-message-info (mime-parse-message))
1044     (setq mime-preview-buffer preview-buffer)
1045     (let ((inhibit-read-only t))
1046       (switch-to-buffer preview-buffer)
1047       (widen)
1048       (erase-buffer)
1049       (setq mime-raw-buffer raw-buffer)
1050       (if mother
1051           (setq mime-mother-buffer mother)
1052         )
1053       (setq mime-preview-original-window-configuration win-conf)
1054       (setq major-mode 'mime-view-mode)
1055       (setq mode-name "MIME-View")
1056       (mime-view-display-entity message message
1057                                 preview-buffer
1058                                 '((entity-button . invisible)
1059                                   (header . visible)
1060                                   ))
1061       (mime-view-define-keymap default-keymap-or-function)
1062       (let ((point
1063              (next-single-property-change (point-min) 'mime-view-entity)))
1064         (if point
1065             (goto-char point)
1066           (goto-char (point-min))
1067           (search-forward "\n\n" nil t)
1068           ))
1069       (run-hooks 'mime-view-mode-hook)
1070       ))
1071   (set-buffer-modified-p nil)
1072   (setq buffer-read-only t)
1073   )
1074
1075 (defun mime-view-buffer (&optional raw-buffer preview-buffer mother
1076                                    default-keymap-or-function)
1077   (interactive)
1078   (mime-view-display-message
1079    (save-excursion
1080      (if raw-buffer (set-buffer raw-buffer))
1081      (mime-parse-message)
1082      )
1083    preview-buffer mother default-keymap-or-function))
1084
1085 (defun mime-view-mode (&optional mother ctl encoding
1086                                  raw-buffer preview-buffer
1087                                  default-keymap-or-function)
1088   "Major mode for viewing MIME message.
1089
1090 Here is a list of the standard keys for mime-view-mode.
1091
1092 key             feature
1093 ---             -------
1094
1095 u               Move to upper content
1096 p or M-TAB      Move to previous content
1097 n or TAB        Move to next content
1098 SPC             Scroll up or move to next content
1099 M-SPC or DEL    Scroll down or move to previous content
1100 RET             Move to next line
1101 M-RET           Move to previous line
1102 v               Decode current content as `play mode'
1103 e               Decode current content as `extract mode'
1104 C-c C-p         Decode current content as `print mode'
1105 a               Followup to current content.
1106 x               Display X-Face
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