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