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-view-over-to-previous-method-alist nil)
 761 (defvar mime-view-over-to-next-method-alist nil)
 762
 763
 764 ;;; @ following method
 765 ;;;
 766
 767 (defvar mime-view-following-method-alist nil
 768   "Alist of major-mode vs. following-method of mime-view.")
 769
 770 (defvar mime-view-following-required-fields-list
 771   '("From"))
 772
 773
 774 ;;; @ X-Face
 775 ;;;
 776
 777 ;; hack from Gnus 5.0.4.
 778
 779 (defvar mime-view-x-face-to-pbm-command
 780   "{ echo '/* Width=48, Height=48 */'; uncompface; } | icontopbm")
 781
 782 (defvar mime-view-x-face-command
 783   (concat mime-view-x-face-to-pbm-command
 784           " | xv -quit -")
 785   "String to be executed to display an X-Face field.
 786 The command will be executed in a sub-shell asynchronously.
 787 The compressed face will be piped to this command.")
 788
 789 (defun mime-view-x-face-function ()
 790   "Function to display X-Face field. You can redefine to customize."
 791   ;; 1995/10/12 (c.f. tm-eng:130)
 792   ;;    fixed by Eric Ding <ericding@San-Jose.ate.slb.com>
 793   (save-restriction
 794     (narrow-to-region (point-min) (re-search-forward "^$" nil t))
 795     ;; end
 796     (goto-char (point-min))
 797     (if (re-search-forward "^X-Face:[ \t]*" nil t)
 798         (let ((beg (match-end 0))
 799               (end (std11-field-end))
 800               )
 801           (call-process-region beg end "sh" nil 0 nil
 802                                "-c" mime-view-x-face-command)
 803           ))))
 804
 805
 806 ;;; @ buffer setup
 807 ;;;
 808
 809 (defun mime-view-display-entity (entity message-info obuf
 810                                         default-situation
 811                                         &optional situation)
 812   (let* ((raw-buffer (mime-entity-buffer entity))
 813          (start (mime-entity-point-min entity))
 814          (end (mime-entity-point-max entity))
 815          original-major-mode end-of-header e nb ne subj)
 816     (set-buffer raw-buffer)
 817     (setq original-major-mode major-mode)
 818     (goto-char start)
 819     (setq end-of-header (if (re-search-forward "^$" nil t)
 820                             (1+ (match-end 0))
 821                           end))
 822     (if (> end-of-header end)
 823         (setq end-of-header end)
 824       )
 825     (save-restriction
 826       (narrow-to-region start end)
 827       (setq subj (eword-decode-string (mime-raw-get-subject entity)))
 828       )
 829     (or situation
 830         (setq situation
 831               (or (ctree-match-calist mime-preview-condition
 832                                       (append (mime-entity-situation entity)
 833                                               default-situation))
 834                   default-situation)))
 835     (let ((button-is-invisible
 836            (eq (cdr (assq 'entity-button situation)) 'invisible))
 837           (header-is-visible
 838            (eq (cdr (assq 'header situation)) 'visible))
 839           (body-presentation-method
 840            (cdr (assq 'body-presentation-method situation)))
 841           (children (mime-entity-children entity)))
 842       (set-buffer obuf)
 843       (setq nb (point))
 844       (narrow-to-region nb nb)
 845       (or button-is-invisible
 846           (if (mime-view-entity-button-visible-p entity)
 847               (mime-view-insert-entity-button entity subj)
 848             ))
 849       (if header-is-visible
 850           (save-restriction
 851             (narrow-to-region (point)(point))
 852             (insert-buffer-substring raw-buffer start end-of-header)
 853             (let ((f (cdr (assq original-major-mode
 854                                 mime-view-content-header-filter-alist))))
 855               (if (functionp f)
 856                   (funcall f)
 857                 (mime-view-default-content-header-filter)
 858                 ))
 859             (run-hooks 'mime-view-content-header-filter-hook)
 860             ))
 861       (cond ((eq body-presentation-method 'with-filter)
 862              (let ((body-filter (cdr (assq 'body-filter situation))))
 863                (save-restriction
 864                  (narrow-to-region (point-max)(point-max))
 865                  (insert-buffer-substring raw-buffer end-of-header end)
 866                  (funcall body-filter situation)
 867                  )))
 868             (children)
 869             ((functionp body-presentation-method)
 870              (funcall body-presentation-method entity situation)
 871              )
 872             (t
 873              (when button-is-invisible
 874                (goto-char (point-max))
 875                (mime-view-insert-entity-button entity subj)
 876                )
 877              (or header-is-visible
 878                  (progn
 879                    (goto-char (point-max))
 880                    (insert "\n")
 881                    ))
 882              ))
 883       (setq ne (point-max))
 884       (widen)
 885       (put-text-property nb ne 'mime-view-entity entity)
 886       (goto-char ne)
 887       (if children
 888           (if (functionp body-presentation-method)
 889               (funcall body-presentation-method entity situation)
 890             (mime-preview-multipart/mixed entity situation)
 891             ))
 892       )))
 893
 894
 895 ;;; @ MIME viewer mode
 896 ;;;
 897
 898 (defconst mime-view-menu-title "MIME-View")
 899 (defconst mime-view-menu-list
 900   '((up          "Move to upper entity"    mime-preview-move-to-upper)
 901     (previous    "Move to previous entity" mime-preview-move-to-previous)
 902     (next        "Move to next entity"     mime-preview-move-to-next)
 903     (scroll-down "Scroll-down"             mime-preview-scroll-down-entity)
 904     (scroll-up   "Scroll-up"               mime-preview-scroll-up-entity)
 905     (play        "Play current entity"     mime-preview-play-current-entity)
 906     (extract     "Extract current entity"  mime-preview-extract-current-entity)
 907     (print       "Print current entity"    mime-preview-print-current-entity)
 908     (x-face      "Show X Face"             mime-preview-display-x-face)
 909     )
 910   "Menu for MIME Viewer")
 911
 912 (cond (running-xemacs
 913        (defvar mime-view-xemacs-popup-menu
 914          (cons mime-view-menu-title
 915                (mapcar (function
 916                         (lambda (item)
 917                           (vector (nth 1 item)(nth 2 item) t)
 918                           ))
 919                        mime-view-menu-list)))
 920        (defun mime-view-xemacs-popup-menu (event)
 921          "Popup the menu in the MIME Viewer buffer"
 922          (interactive "e")
 923          (select-window (event-window event))
 924          (set-buffer (event-buffer event))
 925          (popup-menu 'mime-view-xemacs-popup-menu))
 926        (defvar mouse-button-2 'button2)
 927        )
 928       (t
 929        (defvar mouse-button-2 [mouse-2])
 930        ))
 931
 932 (defun mime-view-define-keymap (&optional default)
 933   (let ((mime-view-mode-map (if (keymapp default)
 934                                 (copy-keymap default)
 935                               (make-sparse-keymap)
 936                               )))
 937     (define-key mime-view-mode-map
 938       "u"        (function mime-preview-move-to-upper))
 939     (define-key mime-view-mode-map
 940       "p"        (function mime-preview-move-to-previous))
 941     (define-key mime-view-mode-map
 942       "n"        (function mime-preview-move-to-next))
 943     (define-key mime-view-mode-map
 944       "\e\t"     (function mime-preview-move-to-previous))
 945     (define-key mime-view-mode-map
 946       "\t"       (function mime-preview-move-to-next))
 947     (define-key mime-view-mode-map
 948       " "        (function mime-preview-scroll-up-entity))
 949     (define-key mime-view-mode-map
 950       "\M- "     (function mime-preview-scroll-down-entity))
 951     (define-key mime-view-mode-map
 952       "\177"     (function mime-preview-scroll-down-entity))
 953     (define-key mime-view-mode-map
 954       "\C-m"     (function mime-preview-next-line-entity))
 955     (define-key mime-view-mode-map
 956       "\C-\M-m"  (function mime-preview-previous-line-entity))
 957     (define-key mime-view-mode-map
 958       "v"        (function mime-preview-play-current-entity))
 959     (define-key mime-view-mode-map
 960       "e"        (function mime-preview-extract-current-entity))
 961     (define-key mime-view-mode-map
 962       "\C-c\C-p" (function mime-preview-print-current-entity))
 963     (define-key mime-view-mode-map
 964       "a"        (function mime-preview-follow-current-entity))
 965     (define-key mime-view-mode-map
 966       "q"        (function mime-preview-quit))
 967     (define-key mime-view-mode-map
 968       "\C-c\C-x" (function mime-preview-kill-buffer))
 969     ;; (define-key mime-view-mode-map
 970     ;;   "<"        (function beginning-of-buffer))
 971     ;; (define-key mime-view-mode-map
 972     ;;   ">"        (function end-of-buffer))
 973     (define-key mime-view-mode-map
 974       "?"        (function describe-mode))
 975     (define-key mime-view-mode-map
 976       [tab] (function mime-preview-move-to-next))
 977     (define-key mime-view-mode-map
 978       [delete] (function mime-preview-scroll-down-entity))
 979     (define-key mime-view-mode-map
 980       [backspace] (function mime-preview-scroll-down-entity))
 981     (if (functionp default)
 982         (cond (running-xemacs
 983                (set-keymap-default-binding mime-view-mode-map default)
 984                )
 985               (t
 986                (setq mime-view-mode-map
 987                      (append mime-view-mode-map (list (cons t default))))
 988                )))
 989     (if mouse-button-2
 990         (define-key mime-view-mode-map
 991           mouse-button-2 (function mime-button-dispatcher))
 992       )
 993     (cond (running-xemacs
 994            (define-key mime-view-mode-map
 995              mouse-button-3 (function mime-view-xemacs-popup-menu))
 996            )
 997           ((>= emacs-major-version 19)
 998            (define-key mime-view-mode-map [menu-bar mime-view]
 999              (cons mime-view-menu-title
1000                    (make-sparse-keymap mime-view-menu-title)))
1001            (mapcar (function
1002                     (lambda (item)
1003                       (define-key mime-view-mode-map
1004                         (vector 'menu-bar 'mime-view (car item))
1005                         (cons (nth 1 item)(nth 2 item))
1006                         )
1007                       ))
1008                    (reverse mime-view-menu-list)
1009                    )
1010            ))
1011     (use-local-map mime-view-mode-map)
1012     (run-hooks 'mime-view-define-keymap-hook)
1013     ))
1014
1015 (defsubst mime-maybe-hide-echo-buffer ()
1016   "Clear mime-echo buffer and delete window for it."
1017   (let ((buf (get-buffer mime-echo-buffer-name)))
1018     (if buf
1019         (save-excursion
1020           (set-buffer buf)
1021           (erase-buffer)
1022           (let ((win (get-buffer-window buf)))
1023             (if win
1024                 (delete-window win)
1025               ))
1026           (bury-buffer buf)
1027           ))))
1028
1029 (defvar mime-view-redisplay nil)
1030
1031 (defun mime-view-display-message (message &optional preview-buffer
1032                                           mother default-keymap-or-function)
1033   (mime-maybe-hide-echo-buffer)
1034   (let ((win-conf (current-window-configuration))
1035         (raw-buffer (mime-entity-buffer message)))
1036     (or preview-buffer
1037         (setq preview-buffer
1038               (concat "*Preview-" (buffer-name raw-buffer) "*")))
1039     (set-buffer raw-buffer)
1040     (setq mime-raw-message-info (mime-parse-message))
1041     (setq mime-preview-buffer preview-buffer)
1042     (let ((inhibit-read-only t))
1043       (switch-to-buffer preview-buffer)
1044       (widen)
1045       (erase-buffer)
1046       (setq mime-raw-buffer raw-buffer)
1047       (if mother
1048           (setq mime-mother-buffer mother)
1049         )
1050       (setq mime-preview-original-window-configuration win-conf)
1051       (setq major-mode 'mime-view-mode)
1052       (setq mode-name "MIME-View")
1053       (mime-view-display-entity message message
1054                                 preview-buffer
1055                                 '((entity-button . invisible)
1056                                   (header . visible)
1057                                   ))
1058       (mime-view-define-keymap default-keymap-or-function)
1059       (let ((point
1060              (next-single-property-change (point-min) 'mime-view-entity)))
1061         (if point
1062             (goto-char point)
1063           (goto-char (point-min))
1064           (search-forward "\n\n" nil t)
1065           ))
1066       (run-hooks 'mime-view-mode-hook)
1067       ))
1068   (set-buffer-modified-p nil)
1069   (setq buffer-read-only t)
1070   )
1071
1072 (defun mime-view-buffer (&optional raw-buffer preview-buffer mother
1073                                    default-keymap-or-function)
1074   (interactive)
1075   (mime-view-display-message
1076    (save-excursion
1077      (if raw-buffer (set-buffer raw-buffer))
1078      (mime-parse-message)
1079      )
1080    preview-buffer mother default-keymap-or-function))
1081
1082 (defun mime-view-mode (&optional mother ctl encoding
1083                                  raw-buffer preview-buffer
1084                                  default-keymap-or-function)
1085   "Major mode for viewing MIME message.
1086
1087 Here is a list of the standard keys for mime-view-mode.
1088
1089 key             feature
1090 ---             -------
1091
1092 u               Move to upper content
1093 p or M-TAB      Move to previous content
1094 n or TAB        Move to next content
1095 SPC             Scroll up or move to next content
1096 M-SPC or DEL    Scroll down or move to previous content
1097 RET             Move to next line
1098 M-RET           Move to previous line
1099 v               Decode current content as `play mode'
1100 e               Decode current content as `extract mode'
1101 C-c C-p         Decode current content as `print mode'
1102 a               Followup to current content.
1103 x               Display X-Face
1104 q               Quit
1105 button-2        Move to point under the mouse cursor
1106                 and decode current content as `play mode'
1107 "
1108   (interactive)
1109   (mime-view-display-message
1110    (save-excursion
1111      (if raw-buffer (set-buffer raw-buffer))
1112      (or mime-view-redisplay
1113          (mime-parse-message ctl encoding))
1114      )
1115    preview-buffer mother default-keymap-or-function))
1116
1117
1118 ;;; @@ playing
1119 ;;;
1120
1121 (autoload 'mime-preview-play-current-entity "mime-play"
1122   "Play current entity." t)
1123
1124 (defun mime-preview-extract-current-entity ()
1125   "Extract current entity into file (maybe).
1126 It decodes current entity to call internal or external method as
1127 \"extract\" mode.  The method is selected from variable
1128 `mime-acting-condition'."
1129   (interactive)
1130   (mime-preview-play-current-entity "extract")
1131   )
1132
1133 (defun mime-preview-print-current-entity ()
1134   "Print current entity (maybe).
1135 It decodes current entity to call internal or external method as
1136 \"print\" mode.  The method is selected from variable
1137 `mime-acting-condition'."
1138   (interactive)
1139   (mime-preview-play-current-entity "print")
1140   )
1141
1142
1143 ;;; @@ following
1144 ;;;
1145
1146 (defun mime-preview-follow-current-entity ()
1147   "Write follow message to current entity.
1148 It calls following-method selected from variable
1149 `mime-view-following-method-alist'."
1150   (interactive)
1151   (let (entity)
1152     (while (null (setq entity
1153                        (get-text-property (point) 'mime-view-entity)))
1154       (backward-char)
1155       )
1156     (let* ((p-beg
1157             (previous-single-property-change (point) 'mime-view-entity))
1158            p-end
1159            (entity-node-id (mime-entity-node-id entity))
1160            (len (length entity-node-id))
1161            )
1162       (cond ((null p-beg)
1163              (setq p-beg
1164                    (if (eq (next-single-property-change (point-min)
1165                                                         'mime-view-entity)
1166                            (point))
1167                        (point)
1168                      (point-min)))
1169              )
1170             ((eq (next-single-property-change p-beg 'mime-view-entity)
1171                  (point))
1172              (setq p-beg (point))
1173              ))
1174       (setq p-end (next-single-property-change p-beg 'mime-view-entity))
1175       (cond ((null p-end)
1176              (setq p-end (point-max))
1177              )
1178             ((null entity-node-id)
1179              (setq p-end (point-max))
1180              )
1181             (t
1182              (save-excursion
1183                (goto-char p-end)
1184                (catch 'tag
1185                  (let (e)
1186                    (while (setq e
1187                                 (next-single-property-change
1188                                  (point) 'mime-view-entity))
1189                      (goto-char e)
1190                      (let ((rc (mime-entity-node-id
1191                                 (get-text-property (point)
1192                                                    'mime-view-entity))))
1193                        (or (equal entity-node-id
1194                                   (nthcdr (- (length rc) len) rc))
1195                            (throw 'tag nil)
1196                            ))
1197                      (setq p-end e)
1198                      ))
1199                  (setq p-end (point-max))
1200                  ))
1201              ))
1202       (let* ((mode (mime-preview-original-major-mode 'recursive))
1203              (new-name
1204               (format "%s-%s" (buffer-name) (reverse entity-node-id)))
1205              new-buf
1206              (the-buf (current-buffer))
1207              (a-buf mime-raw-buffer)
1208              fields)
1209         (save-excursion
1210           (set-buffer (setq new-buf (get-buffer-create new-name)))
1211           (erase-buffer)
1212           (insert-buffer-substring the-buf p-beg p-end)
1213           (goto-char (point-min))
1214           (let ((entity-node-id (mime-entity-node-id entity)) ci str)
1215             (while (progn
1216                      (setq
1217                       str
1218                       (save-excursion
1219                         (set-buffer a-buf)
1220                         (setq
1221                          ci
1222                          (mime-raw-find-entity-from-node-id entity-node-id))
1223                         (save-restriction
1224                           (narrow-to-region
1225                            (mime-entity-point-min ci)
1226                            (mime-entity-point-max ci)
1227                            )
1228                           (std11-header-string-except
1229                            (concat "^"
1230                                    (apply (function regexp-or) fields)
1231                                    ":") ""))))
1232                      (if (and
1233                           (eq (mime-entity-media-type ci) 'message)
1234                           (eq (mime-entity-media-subtype ci) 'rfc822))
1235                          nil
1236                        (if str
1237                            (insert str)
1238                          )
1239                        entity-node-id))
1240               (setq fields (std11-collect-field-names)
1241                     entity-node-id (cdr entity-node-id))
1242               )
1243             )
1244           (let ((rest mime-view-following-required-fields-list))
1245             (while rest
1246               (let ((field-name (car rest)))
1247                 (or (std11-field-body field-name)
1248                     (insert
1249                      (format
1250                       (concat field-name
1251                               ": "
1252                               (save-excursion
1253                                 (set-buffer the-buf)
1254                                 (set-buffer mime-mother-buffer)
1255                                 (set-buffer mime-raw-buffer)
1256                                 (std11-field-body field-name)
1257                                 )
1258                               "\n")))
1259                     ))
1260               (setq rest (cdr rest))
1261               ))
1262           (eword-decode-header)
1263           )
1264         (let ((f (cdr (assq mode mime-view-following-method-alist))))
1265           (if (functionp f)
1266               (funcall f new-buf)
1267             (message
1268              (format
1269               "Sorry, following method for %s is not implemented yet."
1270               mode))
1271             ))
1272         ))))
1273
1274
1275 ;;; @@ X-Face
1276 ;;;
1277
1278 (defun mime-preview-display-x-face ()
1279   (interactive)
1280   (save-window-excursion
1281     (set-buffer mime-raw-buffer)
1282     (mime-view-x-face-function)
1283     ))
1284
1285
1286 ;;; @@ moving
1287 ;;;
1288
1289 (defun mime-preview-move-to-upper ()
1290   "Move to upper entity.
1291 If there is no upper entity, call function `mime-preview-quit'."
1292   (interactive)
1293   (let (cinfo)
1294     (while (null (setq cinfo
1295                        (get-text-property (point) 'mime-view-entity)))
1296       (backward-char)
1297       )
1298     (let ((r (mime-raw-find-entity-from-node-id
1299               (cdr (mime-entity-node-id cinfo))
1300               (get-text-property 1 'mime-view-entity)))
1301           point)
1302       (catch 'tag
1303         (while (setq point (previous-single-property-change
1304                             (point) 'mime-view-entity))
1305           (goto-char point)
1306           (if (eq r (get-text-property (point) 'mime-view-entity))
1307               (throw 'tag t)
1308             )
1309           )
1310         (mime-preview-quit)
1311         ))))
1312
1313 (defun mime-preview-move-to-previous ()
1314   "Move to previous entity.
1315 If there is no previous entity, it calls function registered in
1316 variable `mime-view-over-to-previous-method-alist'."
1317   (interactive)
1318   (while (null (get-text-property (point) 'mime-view-entity))
1319     (backward-char)
1320     )
1321   (let ((point (previous-single-property-change (point) 'mime-view-entity)))
1322     (if point
1323         (if (get-text-property (1- point) 'mime-view-entity)
1324             (goto-char point)
1325           (goto-char (1- point))
1326           (mime-preview-move-to-previous)
1327           )
1328       (let ((f (assq (mime-preview-original-major-mode)
1329                      mime-view-over-to-previous-method-alist)))
1330         (if f
1331             (funcall (cdr f))
1332           ))
1333       )))
1334
1335 (defun mime-preview-move-to-next ()
1336   "Move to next entity.
1337 If there is no previous entity, it calls function registered in
1338 variable `mime-view-over-to-next-method-alist'."
1339   (interactive)
1340   (while (null (get-text-property (point) 'mime-view-entity))
1341     (forward-char)
1342     )
1343   (let ((point (next-single-property-change (point) 'mime-view-entity)))
1344     (if point
1345         (progn
1346           (goto-char point)
1347           (if (null (get-text-property point 'mime-view-entity))
1348               (mime-preview-move-to-next)
1349             ))
1350       (let ((f (assq (mime-preview-original-major-mode)
1351                      mime-view-over-to-next-method-alist)))
1352         (if f
1353             (funcall (cdr f))
1354           ))
1355       )))
1356
1357 (defun mime-preview-scroll-up-entity (&optional h)
1358   "Scroll up current entity.
1359 If reached to (point-max), it calls function registered in variable
1360 `mime-view-over-to-next-method-alist'."
1361   (interactive)
1362   (or h
1363       (setq h (1- (window-height)))
1364       )
1365   (if (= (point) (point-max))
1366       (let ((f (assq (mime-preview-original-major-mode)
1367                      mime-view-over-to-next-method-alist)))
1368         (if f
1369             (funcall (cdr f))
1370           ))
1371     (let ((point
1372            (or (next-single-property-change (point) 'mime-view-entity)
1373                (point-max))))
1374       (forward-line h)
1375       (if (> (point) point)
1376           (goto-char point)
1377         )
1378       )))
1379
1380 (defun mime-preview-scroll-down-entity (&optional h)
1381   "Scroll down current entity.
1382 If reached to (point-min), it calls function registered in variable
1383 `mime-view-over-to-previous-method-alist'."
1384   (interactive)
1385   (or h
1386       (setq h (1- (window-height)))
1387       )
1388   (if (= (point) (point-min))
1389       (let ((f (assq (mime-preview-original-major-mode)
1390                      mime-view-over-to-previous-method-alist)))
1391         (if f
1392             (funcall (cdr f))
1393           ))
1394     (let ((point
1395            (or (previous-single-property-change (point) 'mime-view-entity)
1396                (point-min))))
1397       (forward-line (- h))
1398       (if (< (point) point)
1399           (goto-char point)
1400         ))))
1401
1402 (defun mime-preview-next-line-entity ()
1403   (interactive)
1404   (mime-preview-scroll-up-entity 1)
1405   )
1406
1407 (defun mime-preview-previous-line-entity ()
1408   (interactive)
1409   (mime-preview-scroll-down-entity 1)
1410   )
1411
1412
1413 ;;; @@ quitting
1414 ;;;
1415
1416 (defun mime-preview-quit ()
1417   "Quit from MIME-preview buffer.
1418 It calls function registered in variable
1419 `mime-preview-quitting-method-alist'."
1420   (interactive)
1421   (let ((r (assq (mime-preview-original-major-mode)
1422                  mime-preview-quitting-method-alist)))
1423     (if r
1424         (funcall (cdr r))
1425       )))
1426
1427 (defun mime-preview-kill-buffer ()
1428   (interactive)
1429   (kill-buffer (current-buffer))
1430   )
1431
1432
1433 ;;; @ end
1434 ;;;
1435
1436 (provide 'mime-view)
1437
1438 (run-hooks 'mime-view-load-hook)
1439
1440 ;;; mime-view.el ends here