lisp/gnus/mm-decode.el

   1 ;;; mm-decode.el --- Functions for decoding MIME things
   2
   3 ;; Copyright (C) 1998-2013 Free Software Foundation, Inc.
   4
   5 ;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
   6 ;;      MORIOKA Tomohiko <morioka@jaist.ac.jp>
   7 ;; This file is part of GNU Emacs.
   8
   9 ;; GNU Emacs is free software: you can redistribute it and/or modify
  10 ;; it under the terms of the GNU General Public License as published by
  11 ;; the Free Software Foundation, either version 3 of the License, or
  12 ;; (at your option) any later version.
  13
  14 ;; GNU Emacs is distributed in the hope that it will be useful,
  15 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 ;; GNU General Public License for more details.
  18
  19 ;; You should have received a copy of the GNU General Public License
  20 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  21
  22 ;;; Commentary:
  23
  24 ;;; Code:
  25
  26 ;; For Emacs <22.2 and XEmacs.
  27 (eval-and-compile
  28   (unless (fboundp 'declare-function) (defmacro declare-function (&rest r))))
  29
  30 (require 'mail-parse)
  31 (require 'mm-bodies)
  32 (eval-when-compile (require 'cl))
  33
  34 (autoload 'gnus-map-function "gnus-util")
  35 (autoload 'gnus-replace-in-string "gnus-util")
  36 (autoload 'gnus-read-shell-command "gnus-util")
  37
  38 (autoload 'mm-inline-partial "mm-partial")
  39 (autoload 'mm-inline-external-body "mm-extern")
  40 (autoload 'mm-extern-cache-contents "mm-extern")
  41 (autoload 'mm-insert-inline "mm-view")
  42
  43 (autoload 'mm-archive-decoders "mm-archive")
  44 (autoload 'mm-archive-dissect-and-inline "mm-archive")
  45 (autoload 'mm-dissect-archive "mm-archive")
  46
  47 (defvar gnus-current-window-configuration)
  48
  49 (add-hook 'gnus-exit-gnus-hook 'mm-destroy-postponed-undisplay-list)
  50
  51 (defgroup mime-display ()
  52   "Display of MIME in mail and news articles."
  53   :link '(custom-manual "(emacs-mime)Display Customization")
  54   :version "21.1"
  55   :group 'mail
  56   :group 'news
  57   :group 'multimedia)
  58
  59 (defgroup mime-security ()
  60   "MIME security in mail and news articles."
  61   :link '(custom-manual "(emacs-mime)Display Customization")
  62   :group 'mail
  63   :group 'news
  64   :group 'multimedia)
  65
  66 ;;; Convenience macros.
  67
  68 (defmacro mm-handle-buffer (handle)
  69   `(nth 0 ,handle))
  70 (defmacro mm-handle-type (handle)
  71   `(nth 1 ,handle))
  72 (defsubst mm-handle-media-type (handle)
  73   (if (stringp (car handle))
  74       (car handle)
  75     (car (mm-handle-type handle))))
  76 (defsubst mm-handle-media-supertype (handle)
  77   (car (split-string (mm-handle-media-type handle) "/")))
  78 (defsubst mm-handle-media-subtype (handle)
  79   (cadr (split-string (mm-handle-media-type handle) "/")))
  80 (defmacro mm-handle-encoding (handle)
  81   `(nth 2 ,handle))
  82 (defmacro mm-handle-undisplayer (handle)
  83   `(nth 3 ,handle))
  84 (defmacro mm-handle-set-undisplayer (handle function)
  85   `(setcar (nthcdr 3 ,handle) ,function))
  86 (defmacro mm-handle-disposition (handle)
  87   `(nth 4 ,handle))
  88 (defmacro mm-handle-description (handle)
  89   `(nth 5 ,handle))
  90 (defmacro mm-handle-cache (handle)
  91   `(nth 6 ,handle))
  92 (defmacro mm-handle-set-cache (handle contents)
  93   `(setcar (nthcdr 6 ,handle) ,contents))
  94 (defmacro mm-handle-id (handle)
  95   `(nth 7 ,handle))
  96 (defmacro mm-handle-multipart-original-buffer (handle)
  97   `(get-text-property 0 'buffer (car ,handle)))
  98 (defmacro mm-handle-multipart-from (handle)
  99   `(get-text-property 0 'from (car ,handle)))
 100 (defmacro mm-handle-multipart-ctl-parameter (handle parameter)
 101   `(get-text-property 0 ,parameter (car ,handle)))
 102
 103 (defmacro mm-make-handle (&optional buffer type encoding undisplayer
 104                                     disposition description cache
 105                                     id)
 106   `(list ,buffer ,type ,encoding ,undisplayer
 107          ,disposition ,description ,cache ,id))
 108
 109 (defcustom mm-text-html-renderer
 110   (cond ((fboundp 'libxml-parse-html-region) 'shr)
 111         ((executable-find "w3m") 'gnus-w3m)
 112         ((executable-find "links") 'links)
 113         ((executable-find "lynx") 'lynx)
 114         ((locate-library "w3") 'w3)
 115         ((locate-library "html2text") 'html2text)
 116         (t nil))
 117   "Render of HTML contents.
 118 It is one of defined renderer types, or a rendering function.
 119 The defined renderer types are:
 120 `shr': use the built-in Gnus HTML renderer;
 121 `gnus-w3m': use Gnus renderer based on w3m;
 122 `w3m': use emacs-w3m;
 123 `w3m-standalone': use plain w3m;
 124 `links': use links;
 125 `lynx': use lynx;
 126 `w3': use Emacs/W3;
 127 `html2text': use html2text;
 128 nil    : use external viewer (default web browser)."
 129   :version "24.1"
 130   :type '(choice (const shr)
 131                  (const gnus-w3m)
 132                  (const w3)
 133                  (const w3m :tag "emacs-w3m")
 134                  (const w3m-standalone :tag "standalone w3m" )
 135                  (const links)
 136                  (const lynx)
 137                  (const html2text)
 138                  (const nil :tag "External viewer")
 139                  (function))
 140   :group 'mime-display)
 141
 142 (defcustom mm-inline-text-html-with-images nil
 143   "If non-nil, Gnus will allow retrieving images in HTML contents with
 144 the <img> tags.  It has no effect on Emacs/w3.  See also the
 145 documentation for the `mm-w3m-safe-url-regexp' variable."
 146   :version "22.1"
 147   :type 'boolean
 148   :group 'mime-display)
 149
 150 (defcustom mm-w3m-safe-url-regexp "\\`cid:"
 151   "Regexp matching URLs which are considered to be safe.
 152 Some HTML mails might contain a nasty trick used by spammers, using
 153 the <img> tag which is far more evil than the [Click Here!] button.
 154 It is most likely intended to check whether the ominous spam mail has
 155 reached your eyes or not, in which case the spammer knows for sure
 156 that your email address is valid.  It is done by embedding an
 157 identifier string into a URL that you might automatically retrieve
 158 when displaying the image.  The default value is \"\\\\`cid:\" which only
 159 matches parts embedded to the Multipart/Related type MIME contents and
 160 Gnus will never connect to the spammer's site arbitrarily.  You may
 161 set this variable to nil if you consider all urls to be safe."
 162   :version "22.1"
 163   :type '(choice (regexp :tag "Regexp")
 164                  (const :tag "All URLs are safe" nil))
 165   :group 'mime-display)
 166
 167 (defcustom mm-inline-text-html-with-w3m-keymap t
 168   "If non-nil, use emacs-w3m command keys in the article buffer."
 169   :version "22.1"
 170   :type 'boolean
 171   :group 'mime-display)
 172
 173 (defcustom mm-enable-external t
 174   "Indicate whether external MIME handlers should be used.
 175
 176 If t, all defined external MIME handlers are used.  If nil, files are saved by
 177 `mailcap-save-binary-file'.  If it is the symbol `ask', you are prompted
 178 before the external MIME handler is invoked."
 179   :version "22.1"
 180   :type '(choice (const :tag "Always" t)
 181                  (const :tag "Never" nil)
 182                  (const :tag "Ask" ask))
 183   :group 'mime-display)
 184
 185 (defcustom mm-inline-media-tests
 186   '(("image/p?jpeg"
 187      mm-inline-image
 188      (lambda (handle)
 189        (mm-valid-and-fit-image-p 'jpeg handle)))
 190     ("image/png"
 191      mm-inline-image
 192      (lambda (handle)
 193        (mm-valid-and-fit-image-p 'png handle)))
 194     ("image/gif"
 195      mm-inline-image
 196      (lambda (handle)
 197        (mm-valid-and-fit-image-p 'gif handle)))
 198     ("image/tiff"
 199      mm-inline-image
 200      (lambda (handle)
 201        (mm-valid-and-fit-image-p 'tiff handle)))
 202     ("image/xbm"
 203      mm-inline-image
 204      (lambda (handle)
 205        (mm-valid-and-fit-image-p 'xbm handle)))
 206     ("image/x-xbitmap"
 207      mm-inline-image
 208      (lambda (handle)
 209        (mm-valid-and-fit-image-p 'xbm handle)))
 210     ("image/xpm"
 211      mm-inline-image
 212      (lambda (handle)
 213        (mm-valid-and-fit-image-p 'xpm handle)))
 214     ("image/x-xpixmap"
 215      mm-inline-image
 216      (lambda (handle)
 217        (mm-valid-and-fit-image-p 'xpm handle)))
 218     ("image/bmp"
 219      mm-inline-image
 220      (lambda (handle)
 221        (mm-valid-and-fit-image-p 'bmp handle)))
 222     ("image/x-portable-bitmap"
 223      mm-inline-image
 224      (lambda (handle)
 225        (mm-valid-and-fit-image-p 'pbm handle)))
 226     ("text/plain" mm-inline-text identity)
 227     ("text/enriched" mm-inline-text identity)
 228     ("text/richtext" mm-inline-text identity)
 229     ("text/x-patch" mm-display-patch-inline identity)
 230     ;; In case mime.types uses x-diff (as does Debian's mime-support-3.40).
 231     ("text/x-diff" mm-display-patch-inline identity)
 232     ("application/emacs-lisp" mm-display-elisp-inline identity)
 233     ("application/x-emacs-lisp" mm-display-elisp-inline identity)
 234     ("application/x-shellscript" mm-display-shell-script-inline identity)
 235     ("application/x-sh" mm-display-shell-script-inline identity)
 236     ("text/x-sh" mm-display-shell-script-inline identity)
 237     ("application/javascript" mm-display-javascript-inline identity)
 238     ("text/dns" mm-display-dns-inline identity)
 239     ("text/x-org" mm-display-org-inline identity)
 240     ("text/html"
 241      mm-inline-text-html
 242      (lambda (handle)
 243        mm-text-html-renderer))
 244     ("text/x-vcard"
 245      mm-inline-text-vcard
 246      (lambda (handle)
 247        (or (featurep 'vcard)
 248            (locate-library "vcard"))))
 249     ("message/delivery-status" mm-inline-text identity)
 250     ("message/rfc822" mm-inline-message identity)
 251     ("message/partial" mm-inline-partial identity)
 252     ("message/external-body" mm-inline-external-body identity)
 253     ("text/.*" mm-inline-text identity)
 254     ("application/x-.?tar\\(-.*\\)?" mm-archive-dissect-and-inline identity)
 255     ("application/zip" mm-archive-dissect-and-inline identity)
 256     ("audio/wav" mm-inline-audio
 257      (lambda (handle)
 258        (and (or (featurep 'nas-sound) (featurep 'native-sound))
 259             (device-sound-enabled-p))))
 260     ("audio/au"
 261      mm-inline-audio
 262      (lambda (handle)
 263        (and (or (featurep 'nas-sound) (featurep 'native-sound))
 264             (device-sound-enabled-p))))
 265     ("application/pgp-signature" ignore identity)
 266     ("application/x-pkcs7-signature" ignore identity)
 267     ("application/pkcs7-signature" ignore identity)
 268     ("application/x-pkcs7-mime" ignore identity)
 269     ("application/pkcs7-mime" ignore identity)
 270     ("multipart/alternative" ignore identity)
 271     ("multipart/mixed" ignore identity)
 272     ("multipart/related" ignore identity)
 273     ("image/.*"
 274      mm-inline-image
 275      (lambda (handle)
 276        (and (mm-valid-image-format-p 'imagemagick)
 277             (mm-with-unibyte-buffer
 278               (mm-insert-part handle)
 279               (let ((image
 280                      (ignore-errors
 281                        (if (fboundp 'create-image)
 282                            (create-image (buffer-string) 'imagemagick 'data-p)
 283                          (mm-create-image-xemacs
 284                           (mm-handle-media-subtype handle))))))
 285                 (when image
 286                   (setcar (cdr handle) (list "image/imagemagick"))
 287                   (mm-image-fit-p handle)))))))
 288     ;; Disable audio and image
 289     ("audio/.*" ignore ignore)
 290     ("image/.*" ignore ignore)
 291     ;; Default to displaying as text
 292     (".*" mm-inline-text mm-readable-p))
 293   "Alist of media types/tests saying whether types can be displayed inline."
 294   :type '(repeat (list (regexp :tag "MIME type")
 295                        (function :tag "Display function")
 296                        (function :tag "Display test")))
 297   :group 'mime-display)
 298
 299 (defcustom mm-inlined-types
 300   '("image/.*" "text/.*" "message/delivery-status" "message/rfc822"
 301     "message/partial" "message/external-body" "application/emacs-lisp"
 302     "application/x-emacs-lisp"
 303     "application/pgp-signature" "application/x-pkcs7-signature"
 304     "application/pkcs7-signature" "application/x-pkcs7-mime"
 305     "application/pkcs7-mime"
 306     "application/x-gtar-compressed"
 307     "application/x-tar"
 308     "application/zip"
 309     ;; Mutt still uses this even though it has already been withdrawn.
 310     "application/pgp")
 311   "List of media types that are to be displayed inline.
 312 See also `mm-inline-media-tests', which says how to display a media
 313 type inline."
 314   :type '(repeat regexp)
 315   :group 'mime-display)
 316
 317 (defcustom mm-keep-viewer-alive-types
 318   '("application/postscript" "application/msword" "application/vnd.ms-excel"
 319     "application/pdf" "application/x-dvi")
 320   "List of media types for which the external viewer will not be killed
 321 when selecting a different article."
 322   :version "22.1"
 323   :type '(repeat regexp)
 324   :group 'mime-display)
 325
 326 (defcustom mm-automatic-display
 327   '("text/plain" "text/enriched" "text/richtext" "text/html" "text/x-verbatim"
 328     "text/x-vcard" "image/.*" "message/delivery-status" "multipart/.*"
 329     "message/rfc822" "text/x-patch" "text/dns" "application/pgp-signature"
 330     "application/emacs-lisp" "application/x-emacs-lisp"
 331     "application/x-pkcs7-signature"
 332     "application/pkcs7-signature" "application/x-pkcs7-mime"
 333     "application/pkcs7-mime"
 334     ;; Mutt still uses this even though it has already been withdrawn.
 335     "application/pgp\\'"
 336      "text/x-org")
 337   "A list of MIME types to be displayed automatically."
 338   :type '(repeat regexp)
 339   :group 'mime-display)
 340
 341 (defcustom mm-attachment-override-types '("text/x-vcard"
 342                                           "application/pkcs7-mime"
 343                                           "application/x-pkcs7-mime"
 344                                           "application/pkcs7-signature"
 345                                           "application/x-pkcs7-signature")
 346   "Types to have \"attachment\" ignored if they can be displayed inline."
 347   :type '(repeat regexp)
 348   :group 'mime-display)
 349
 350 (defcustom mm-inline-override-types nil
 351   "Types to be treated as attachments even if they can be displayed inline."
 352   :type '(repeat regexp)
 353   :group 'mime-display)
 354
 355 (defcustom mm-automatic-external-display nil
 356   "List of MIME type regexps that will be displayed externally automatically."
 357   :type '(repeat regexp)
 358   :group 'mime-display)
 359
 360 (defcustom mm-discouraged-alternatives nil
 361   "List of MIME types that are discouraged when viewing multipart/alternative.
 362 Viewing agents are supposed to view the last possible part of a message,
 363 as that is supposed to be the richest.  However, users may prefer other
 364 types instead, and this list says what types are most unwanted.  If,
 365 for instance, text/html parts are very unwanted, and text/richtext are
 366 somewhat unwanted, then the value of this variable should be set
 367 to:
 368
 369  (\"text/html\" \"text/richtext\")
 370
 371 Adding \"image/.*\" might also be useful.  Spammers use it as the
 372 preferred part of multipart/alternative messages.  See also
 373 `gnus-buttonized-mime-types', to which adding \"multipart/alternative\"
 374 enables you to choose manually one of two types those mails include."
 375   :type '(repeat regexp) ;; See `mm-preferred-alternative-precedence'.
 376   :group 'mime-display)
 377
 378 (defcustom mm-tmp-directory
 379   (if (fboundp 'temp-directory)
 380       (temp-directory)
 381     (if (boundp 'temporary-file-directory)
 382         temporary-file-directory
 383       "/tmp/"))
 384   "Where mm will store its temporary files."
 385   :type 'directory
 386   :group 'mime-display)
 387
 388 (defcustom mm-inline-large-images nil
 389   "If t, then all images fit in the buffer.
 390 If 'resize, try to resize the images so they fit."
 391   :type '(radio
 392           (const :tag "Inline large images as they are." t)
 393           (const :tag "Resize large images." resize)
 394           (const :tag "Do not inline large images." nil))
 395   :group 'mime-display)
 396
 397 (defcustom mm-file-name-rewrite-functions
 398   '(mm-file-name-delete-control mm-file-name-delete-gotchas)
 399   "List of functions used for rewriting file names of MIME parts.
 400 Each function takes a file name as input and returns a file name.
 401
 402 Ready-made functions include `mm-file-name-delete-control',
 403 `mm-file-name-delete-gotchas' (you should not remove these two
 404 functions), `mm-file-name-delete-whitespace',
 405 `mm-file-name-trim-whitespace', `mm-file-name-collapse-whitespace',
 406 `mm-file-name-replace-whitespace', `capitalize', `downcase',
 407 `upcase', and `upcase-initials'."
 408   :type '(list (set :inline t
 409                     (const mm-file-name-delete-control)
 410                     (const mm-file-name-delete-gotchas)
 411                     (const mm-file-name-delete-whitespace)
 412                     (const mm-file-name-trim-whitespace)
 413                     (const mm-file-name-collapse-whitespace)
 414                     (const mm-file-name-replace-whitespace)
 415                     (const capitalize)
 416                     (const downcase)
 417                     (const upcase)
 418                     (const upcase-initials)
 419                (repeat :inline t
 420                        :tag "Function"
 421                        function)))
 422   :version "23.1" ;; No Gnus
 423   :group 'mime-display)
 424
 425
 426 (defvar mm-path-name-rewrite-functions nil
 427   "*List of functions for rewriting the full file names of MIME parts.
 428 This is used when viewing parts externally, and is meant for
 429 transforming the absolute name so that non-compliant programs can find
 430 the file where it's saved.
 431
 432 Each function takes a file name as input and returns a file name.")
 433
 434 (defvar mm-file-name-replace-whitespace nil
 435   "String used for replacing whitespace characters; default is `\"_\"'.")
 436
 437 (defcustom mm-default-directory nil
 438   "The default directory where mm will save files.
 439 If not set, `default-directory' will be used."
 440   :type '(choice directory (const :tag "Default" nil))
 441   :group 'mime-display)
 442
 443 (defcustom mm-attachment-file-modes 384
 444   "Set the mode bits of saved attachments to this integer."
 445   :version "22.1"
 446   :type 'integer
 447   :group 'mime-display)
 448
 449 (defcustom mm-external-terminal-program "xterm"
 450   "The program to start an external terminal."
 451   :version "22.1"
 452   :type 'string
 453   :group 'mime-display)
 454
 455 ;;; Internal variables.
 456
 457 (defvar mm-last-shell-command "")
 458 (defvar mm-content-id-alist nil)
 459 (defvar mm-postponed-undisplay-list nil)
 460 (defvar mm-inhibit-auto-detect-attachment nil)
 461
 462 ;; According to RFC2046, in particular, in a digest, the default
 463 ;; Content-Type value for a body part is changed from "text/plain" to
 464 ;; "message/rfc822".
 465 (defvar mm-dissect-default-type "text/plain")
 466
 467 (autoload 'mml2015-verify "mml2015")
 468 (autoload 'mml2015-verify-test "mml2015")
 469 (autoload 'mml-smime-verify "mml-smime")
 470 (autoload 'mml-smime-verify-test "mml-smime")
 471
 472 (defvar mm-verify-function-alist
 473   '(("application/pgp-signature" mml2015-verify "PGP" mml2015-verify-test)
 474     ("application/x-gnus-pgp-signature" mm-uu-pgp-signed-extract-1 "PGP"
 475      mm-uu-pgp-signed-test)
 476     ("application/pkcs7-signature" mml-smime-verify "S/MIME"
 477      mml-smime-verify-test)
 478     ("application/x-pkcs7-signature" mml-smime-verify "S/MIME"
 479      mml-smime-verify-test)))
 480
 481 (defcustom mm-verify-option 'never
 482   "Option of verifying signed parts.
 483 `never', not verify; `always', always verify;
 484 `known', only verify known protocols.  Otherwise, ask user.
 485
 486 When set to `always' or `known', you should add
 487 \"multipart/signed\" to `gnus-buttonized-mime-types' to see
 488 result of the verification."
 489   :version "22.1"
 490   :type '(choice (item always)
 491                  (item never)
 492                  (item :tag "only known protocols" known)
 493                  (item :tag "ask" nil))
 494   :group 'mime-security)
 495
 496 (autoload 'mml2015-decrypt "mml2015")
 497 (autoload 'mml2015-decrypt-test "mml2015")
 498
 499 (defvar mm-decrypt-function-alist
 500   '(("application/pgp-encrypted" mml2015-decrypt "PGP" mml2015-decrypt-test)
 501     ("application/x-gnus-pgp-encrypted" mm-uu-pgp-encrypted-extract-1 "PGP"
 502      mm-uu-pgp-encrypted-test)))
 503
 504 (defcustom mm-decrypt-option nil
 505   "Option of decrypting encrypted parts.
 506 `never', not decrypt; `always', always decrypt;
 507 `known', only decrypt known protocols.  Otherwise, ask user."
 508   :version "22.1"
 509   :type '(choice (item always)
 510                  (item never)
 511                  (item :tag "only known protocols" known)
 512                  (item :tag "ask" nil))
 513   :group 'mime-security)
 514
 515 (defvar mm-viewer-completion-map
 516   (let ((map (make-sparse-keymap 'mm-viewer-completion-map)))
 517     (set-keymap-parent map minibuffer-local-completion-map)
 518     ;; Should we bind other key to minibuffer-complete-word?
 519     (define-key map " " 'self-insert-command)
 520     map)
 521   "Keymap for input viewer with completion.")
 522
 523 (defvar mm-viewer-completion-map
 524   (let ((map (make-sparse-keymap 'mm-viewer-completion-map)))
 525     (set-keymap-parent map minibuffer-local-completion-map)
 526     ;; Should we bind other key to minibuffer-complete-word?
 527     (define-key map " " 'self-insert-command)
 528     map)
 529   "Keymap for input viewer with completion.")
 530
 531 ;;; The functions.
 532
 533 (defun mm-alist-to-plist (alist)
 534   "Convert association list ALIST into the equivalent property-list form.
 535 The plist is returned.  This converts from
 536
 537 \((a . 1) (b . 2) (c . 3))
 538
 539 into
 540
 541 \(a 1 b 2 c 3)
 542
 543 The original alist is not modified.  See also `destructive-alist-to-plist'."
 544   (let (plist)
 545     (while alist
 546       (let ((el (car alist)))
 547         (setq plist (cons (cdr el) (cons (car el) plist))))
 548       (setq alist (cdr alist)))
 549     (nreverse plist)))
 550
 551 (defun mm-keep-viewer-alive-p (handle)
 552   "Say whether external viewer for HANDLE should stay alive."
 553   (let ((types mm-keep-viewer-alive-types)
 554         (type (mm-handle-media-type handle))
 555         ty)
 556     (catch 'found
 557       (while (setq ty (pop types))
 558         (when (string-match ty type)
 559           (throw 'found t))))))
 560
 561 (defun mm-handle-set-external-undisplayer (handle function)
 562   "Set the undisplayer for HANDLE to FUNCTION.
 563 Postpone undisplaying of viewers for types in
 564 `mm-keep-viewer-alive-types'."
 565   (if (mm-keep-viewer-alive-p handle)
 566       (let ((new-handle (copy-sequence handle)))
 567         (mm-handle-set-undisplayer new-handle function)
 568         (mm-handle-set-undisplayer handle nil)
 569         (push new-handle mm-postponed-undisplay-list))
 570     (mm-handle-set-undisplayer handle function)))
 571
 572 (defun mm-destroy-postponed-undisplay-list ()
 573   (when mm-postponed-undisplay-list
 574     (message "Destroying external MIME viewers")
 575     (mm-destroy-parts mm-postponed-undisplay-list)))
 576
 577 (autoload 'message-fetch-field "message")
 578
 579 (defun mm-dissect-buffer (&optional no-strict-mime loose-mime from)
 580   "Dissect the current buffer and return a list of MIME handles.
 581 If NO-STRICT-MIME, don't require the message to have a
 582 MIME-Version header before proceeding."
 583   (save-excursion
 584     (let (ct ctl type subtype cte cd description id result)
 585       (save-restriction
 586         (mail-narrow-to-head)
 587         (when (or no-strict-mime
 588                   loose-mime
 589                   (mail-fetch-field "mime-version"))
 590           (setq ct (mail-fetch-field "content-type")
 591                 ctl (and ct (mail-header-parse-content-type ct))
 592                 cte (mail-fetch-field "content-transfer-encoding")
 593                 cd (or (mail-fetch-field "content-disposition")
 594                        (when (and ctl
 595                                   (eq 'mm-inline-text
 596                                       (cadr (mm-assoc-string-match
 597                                              mm-inline-media-tests
 598                                              (car ctl)))))
 599                          "inline"))
 600                 ;; Newlines in description should be stripped so as
 601                 ;; not to break the MIME tag into two or more lines.
 602                 description (message-fetch-field "content-description")
 603                 id (mail-fetch-field "content-id"))
 604           (unless from
 605             (setq from (mail-fetch-field "from")))
 606           ;; FIXME: In some circumstances, this code is running within
 607           ;; an unibyte macro.  mail-extract-address-components
 608           ;; creates unibyte buffers. This `if', though not a perfect
 609           ;; solution, avoids most of them.
 610           (if from
 611               (setq from (cadr (mail-extract-address-components from))))
 612           (if description
 613               (setq description (mail-decode-encoded-word-string
 614                                  description)))))
 615       (if (or (not ctl)
 616               (not (string-match "/" (car ctl))))
 617           (mm-dissect-singlepart
 618            (list mm-dissect-default-type)
 619            (and cte (intern (downcase (mail-header-strip cte))))
 620            no-strict-mime
 621            (and cd (mail-header-parse-content-disposition cd))
 622            description)
 623         (setq type (split-string (car ctl) "/"))
 624         (setq subtype (cadr type)
 625               type (car type))
 626         (setq
 627          result
 628          (cond
 629           ((equal type "multipart")
 630            (let ((mm-dissect-default-type (if (equal subtype "digest")
 631                                               "message/rfc822"
 632                                             "text/plain"))
 633                  (start (cdr (assq 'start (cdr ctl)))))
 634              (add-text-properties 0 (length (car ctl))
 635                                   (mm-alist-to-plist (cdr ctl)) (car ctl))
 636
 637              ;; what really needs to be done here is a way to link a
 638              ;; MIME handle back to it's parent MIME handle (in a multilevel
 639              ;; MIME article).  That would probably require changing
 640              ;; the mm-handle API so we simply store the multipart buffer
 641              ;; name as a text property of the "multipart/whatever" string.
 642              (add-text-properties 0 (length (car ctl))
 643                                   (list 'buffer (mm-copy-to-buffer)
 644                                         'from from
 645                                         'start start)
 646                                   (car ctl))
 647              (cons (car ctl) (mm-dissect-multipart ctl from))))
 648           (t
 649            (mm-possibly-verify-or-decrypt
 650             (mm-dissect-singlepart
 651              ctl
 652              (and cte (intern (downcase (mail-header-strip cte))))
 653              no-strict-mime
 654              (and cd (mail-header-parse-content-disposition cd))
 655              description id)
 656             ctl from))))
 657         (when id
 658           (when (string-match " *<\\(.*\\)> *" id)
 659             (setq id (match-string 1 id)))
 660           (push (cons id result) mm-content-id-alist))
 661         result))))
 662
 663 (defun mm-dissect-singlepart (ctl cte &optional force cdl description id)
 664   (when (or force
 665             (if (equal "text/plain" (car ctl))
 666                 (assoc 'format ctl)
 667               t))
 668     ;; Guess what the type of application/octet-stream parts should
 669     ;; really be.
 670     (let ((filename (cdr (assq 'filename (cdr cdl)))))
 671       (when (and (not mm-inhibit-auto-detect-attachment)
 672                  (equal (car ctl) "application/octet-stream")
 673                  filename
 674                  (string-match "\\.\\([^.]+\\)$" filename))
 675         (let ((new-type (mailcap-extension-to-mime (match-string 1 filename))))
 676           (when new-type
 677             (setcar ctl new-type)))))
 678     (let ((handle
 679            (mm-make-handle
 680             (mm-copy-to-buffer) ctl cte nil cdl description nil id))
 681           (decoder (assoc (car ctl) (mm-archive-decoders))))
 682       (if (and decoder
 683                ;; Do automatic decoding
 684                (cadr decoder)
 685                (executable-find (caddr decoder)))
 686           (mm-dissect-archive handle)
 687         handle))))
 688
 689 (defun mm-dissect-multipart (ctl from)
 690   (goto-char (point-min))
 691   (let* ((boundary (concat "\n--" (mail-content-type-get ctl 'boundary)))
 692          (close-delimiter (concat (regexp-quote boundary) "--[ \t]*$"))
 693          start parts
 694          (end (save-excursion
 695                 (goto-char (point-max))
 696                 (if (re-search-backward close-delimiter nil t)
 697                     (match-beginning 0)
 698                   (point-max))))
 699          (mm-inhibit-auto-detect-attachment
 700           (equal (car ctl) "multipart/encrypted")))
 701     (setq boundary (concat (regexp-quote boundary) "[ \t]*$"))
 702     (while (and (< (point) end) (re-search-forward boundary end t))
 703       (goto-char (match-beginning 0))
 704       (when start
 705         (save-excursion
 706           (save-restriction
 707             (narrow-to-region start (point))
 708             (setq parts (nconc (list (mm-dissect-buffer t nil from)) parts)))))
 709       (end-of-line 2)
 710       (or (looking-at boundary)
 711           (forward-line 1))
 712       (setq start (point)))
 713     (when (and start (< start end))
 714       (save-excursion
 715         (save-restriction
 716           (narrow-to-region start end)
 717           (setq parts (nconc (list (mm-dissect-buffer t nil from)) parts)))))
 718     (mm-possibly-verify-or-decrypt (nreverse parts) ctl from)))
 719
 720 (defun mm-copy-to-buffer ()
 721   "Copy the contents of the current buffer to a fresh buffer."
 722   (let ((obuf (current-buffer))
 723         (mb (mm-multibyte-p))
 724         beg)
 725     (goto-char (point-min))
 726     (search-forward-regexp "^\n" nil t)
 727     (setq beg (point))
 728     (with-current-buffer
 729           (generate-new-buffer " *mm*")
 730       ;; Preserve the data's unibyteness (for url-insert-file-contents).
 731       (mm-set-buffer-multibyte mb)
 732       (insert-buffer-substring obuf beg)
 733       (current-buffer))))
 734
 735 (defun mm-display-parts (handle &optional no-default)
 736   (if (stringp (car handle))
 737       (mapcar 'mm-display-parts (cdr handle))
 738     (if (bufferp (car handle))
 739         (save-restriction
 740           (narrow-to-region (point) (point))
 741           (mm-display-part handle)
 742           (goto-char (point-max)))
 743       (mapcar 'mm-display-parts handle))))
 744
 745 (autoload 'mailcap-parse-mailcaps "mailcap")
 746 (autoload 'mailcap-mime-info "mailcap")
 747
 748 (defun mm-display-part (handle &optional no-default force)
 749   "Display the MIME part represented by HANDLE.
 750 Returns nil if the part is removed; inline if displayed inline;
 751 external if displayed external."
 752   (save-excursion
 753     (mailcap-parse-mailcaps)
 754     (if (and (not force)
 755              (mm-handle-displayed-p handle))
 756         (mm-remove-part handle)
 757       (let* ((ehandle (if (equal (mm-handle-media-type handle)
 758                                  "message/external-body")
 759                           (progn
 760                             (unless (mm-handle-cache handle)
 761                               (mm-extern-cache-contents handle))
 762                             (mm-handle-cache handle))
 763                         handle))
 764              (type (mm-handle-media-type ehandle))
 765              (method (mailcap-mime-info type))
 766              (filename (or (mail-content-type-get
 767                             (mm-handle-disposition handle) 'filename)
 768                            (mail-content-type-get
 769                             (mm-handle-type handle) 'name)
 770                            "<file>"))
 771              (external mm-enable-external)
 772              (decoder (assoc (car (mm-handle-type handle))
 773                              (mm-archive-decoders))))
 774         (cond
 775          ((and decoder
 776                (executable-find (caddr decoder)))
 777           (mm-archive-dissect-and-inline handle)
 778           'inline)
 779          ((and (mm-inlinable-p ehandle)
 780                (mm-inlined-p ehandle))
 781           (forward-line 1)
 782           (mm-display-inline handle)
 783           'inline)
 784          ((or method
 785               (not no-default))
 786           (if (and (not method)
 787                    (equal "text" (car (split-string type "/"))))
 788               (progn
 789                 (forward-line 1)
 790                 (mm-insert-inline handle (mm-get-part handle))
 791                 'inline)
 792             (setq external
 793                   (and method         ;; If nil, we always use "save".
 794                        (stringp method) ;; 'mailcap-save-binary-file
 795                        (or (eq mm-enable-external t)
 796                            (and (eq mm-enable-external 'ask)
 797                                 (y-or-n-p
 798                                  (concat
 799                                   "Display part (" type
 800                                   ") using external program"
 801                                   ;; Can non-string method ever happen?
 802                                   (if (stringp method)
 803                                       (concat
 804                                        " \"" (format method filename) "\"")
 805                                     "")
 806                                   "? "))))))
 807             (if external
 808                 (mm-display-external
 809                  handle (or method 'mailcap-save-binary-file))
 810               (mm-display-external
 811                handle 'mailcap-save-binary-file)))))))))
 812
 813 (declare-function gnus-configure-windows "gnus-win" (setting &optional force))
 814 (defvar mailcap-mime-extensions)        ; mailcap-mime-info autoloads
 815 (declare-function term-mode "term" ())
 816 (declare-function term-char-mode "term" ())
 817
 818 (defun mm-display-external (handle method)
 819   "Display HANDLE using METHOD."
 820   (let ((outbuf (current-buffer)))
 821     (mm-with-unibyte-buffer
 822       (if (functionp method)
 823           (let ((cur (current-buffer)))
 824             (if (eq method 'mailcap-save-binary-file)
 825                 (progn
 826                   (set-buffer (generate-new-buffer " *mm*"))
 827                   (setq method nil))
 828               (mm-insert-part handle)
 829               (mm-add-meta-html-tag handle)
 830               (let ((win (get-buffer-window cur t)))
 831                 (when win
 832                   (select-window win)))
 833               (switch-to-buffer (generate-new-buffer " *mm*")))
 834             (buffer-disable-undo)
 835             (mm-set-buffer-file-coding-system mm-binary-coding-system)
 836             (insert-buffer-substring cur)
 837             (goto-char (point-min))
 838             (when method
 839               (message "Viewing with %s" method))
 840             (let ((mm (current-buffer))
 841                   (non-viewer (assq 'non-viewer
 842                                     (mailcap-mime-info
 843                                      (mm-handle-media-type handle) t))))
 844               (unwind-protect
 845                   (if method
 846                       (funcall method)
 847                     (mm-save-part handle))
 848                 (when (and (not non-viewer)
 849                            method)
 850                   (mm-handle-set-undisplayer handle mm)))))
 851         ;; The function is a string to be executed.
 852         (mm-insert-part handle)
 853         (mm-add-meta-html-tag handle)
 854         (let* ((dir (mm-make-temp-file
 855                      (expand-file-name "emm." mm-tmp-directory) 'dir))
 856                (filename (or
 857                           (mail-content-type-get
 858                            (mm-handle-disposition handle) 'filename)
 859                           (mail-content-type-get
 860                            (mm-handle-type handle) 'name)))
 861                (mime-info (mailcap-mime-info
 862                            (mm-handle-media-type handle) t))
 863                (needsterm (or (assoc "needsterm" mime-info)
 864                               (assoc "needsterminal" mime-info)))
 865                (copiousoutput (assoc "copiousoutput" mime-info))
 866                file buffer)
 867           ;; We create a private sub-directory where we store our files.
 868           (set-file-modes dir #o700)
 869           (if filename
 870               (setq file (expand-file-name
 871                           (gnus-map-function mm-file-name-rewrite-functions
 872                                              (file-name-nondirectory filename))
 873                           dir))
 874             ;; Use nametemplate (defined in RFC1524) if it is specified
 875             ;; in mailcap.
 876             (let ((suffix (cdr (assoc "nametemplate" mime-info))))
 877               (if (and suffix
 878                        (string-match "\\`%s\\(\\..+\\)\\'" suffix))
 879                   (setq suffix (match-string 1 suffix))
 880                 ;; Otherwise, use a suffix according to
 881                 ;; `mailcap-mime-extensions'.
 882                 (setq suffix (car (rassoc (mm-handle-media-type handle)
 883                                           mailcap-mime-extensions))))
 884               (setq file (mm-make-temp-file (expand-file-name "mm." dir)
 885                                             nil suffix))))
 886           (let ((coding-system-for-write mm-binary-coding-system))
 887             (write-region (point-min) (point-max) file nil 'nomesg))
 888           ;; The file is deleted after the viewer exists.  If the users edits
 889           ;; the file, changes will be lost.  Set file to read-only to make it
 890           ;; clear.
 891           (set-file-modes file #o400)
 892           (message "Viewing with %s" method)
 893           (cond
 894            (needsterm
 895             (let ((command (mm-mailcap-command
 896                             method file (mm-handle-type handle))))
 897               (unwind-protect
 898                   (if window-system
 899                       (start-process "*display*" nil
 900                                      mm-external-terminal-program
 901                                      "-e" shell-file-name
 902                                      shell-command-switch command)
 903                     (require 'term)
 904                     (require 'gnus-win)
 905                     (set-buffer
 906                      (setq buffer
 907                            (make-term "display"
 908                                       shell-file-name
 909                                       nil
 910                                       shell-command-switch command)))
 911                     (term-mode)
 912                     (term-char-mode)
 913                     (set-process-sentinel
 914                      (get-buffer-process buffer)
 915                      `(lambda (process state)
 916                         (if (eq 'exit (process-status process))
 917                             (gnus-configure-windows
 918                              ',gnus-current-window-configuration))))
 919                     (gnus-configure-windows 'display-term))
 920                 (mm-handle-set-external-undisplayer handle (cons file buffer)))
 921               (message "Displaying %s..." command))
 922             'external)
 923            (copiousoutput
 924             (with-current-buffer outbuf
 925               (forward-line 1)
 926               (mm-insert-inline
 927                handle
 928                (unwind-protect
 929                    (progn
 930                      (call-process shell-file-name nil
 931                                    (setq buffer
 932                                          (generate-new-buffer " *mm*"))
 933                                    nil
 934                                    shell-command-switch
 935                                    (mm-mailcap-command
 936                                     method file (mm-handle-type handle)))
 937                      (if (buffer-live-p buffer)
 938                          (with-current-buffer buffer
 939                            (buffer-string))))
 940                  (progn
 941                    (ignore-errors (delete-file file))
 942                    (ignore-errors (delete-directory
 943                                    (file-name-directory file)))
 944                    (ignore-errors (kill-buffer buffer))))))
 945             'inline)
 946            (t
 947             ;; Deleting the temp file should be postponed for some wrappers,
 948             ;; shell scripts, and so on, which might exit right after having
 949             ;; started a viewer command as a background job.
 950             (let ((command (mm-mailcap-command
 951                             method file (mm-handle-type handle))))
 952               (unwind-protect
 953                   (progn
 954                     (start-process "*display*"
 955                                    (setq buffer
 956                                          (generate-new-buffer " *mm*"))
 957                                    shell-file-name
 958                                    shell-command-switch command)
 959                     (set-process-sentinel
 960                      (get-buffer-process buffer)
 961                      (lexical-let ((outbuf outbuf)
 962                                    (file file)
 963                                    (buffer buffer)
 964                                    (command command)
 965                                    (handle handle))
 966                        (run-at-time
 967                         30.0 nil
 968                         (lambda ()
 969                           (ignore-errors
 970                             (delete-file file))
 971                           (ignore-errors
 972                             (delete-directory (file-name-directory file)))))
 973                        (lambda (process state)
 974                          (when (eq (process-status process) 'exit)
 975                            (condition-case nil
 976                                (delete-file file)
 977                              (error))
 978                            (condition-case nil
 979                                (delete-directory (file-name-directory file))
 980                              (error))
 981                            (when (buffer-live-p outbuf)
 982                              (with-current-buffer outbuf
 983                                (let ((buffer-read-only nil)
 984                                      (point (point)))
 985                                  (forward-line 2)
 986                                  (mm-insert-inline
 987                                   handle (with-current-buffer buffer
 988                                            (buffer-string)))
 989                                  (goto-char point))))
 990                            (when (buffer-live-p buffer)
 991                              (kill-buffer buffer)))
 992                          (message "Displaying %s...done" command)))))
 993                 (mm-handle-set-external-undisplayer
 994                  handle (cons file buffer)))
 995               (message "Displaying %s..." command))
 996             'external)))))))
 997
 998 (defun mm-mailcap-command (method file type-list)
 999   (let ((ctl (cdr type-list))
1000         (beg 0)
1001         (uses-stdin t)
1002         out sub total)
1003     (while (string-match "%{\\([^}]+\\)}\\|'%s'\\|\"%s\"\\|%s\\|%t\\|%%"
1004                          method beg)
1005       (push (substring method beg (match-beginning 0)) out)
1006       (setq beg (match-end 0)
1007             total (match-string 0 method)
1008             sub (match-string 1 method))
1009       (cond
1010        ((string= total "%%")
1011         (push "%" out))
1012        ((or (string= total "%s")
1013             ;; We do our own quoting.
1014             (string= total "'%s'")
1015             (string= total "\"%s\""))
1016         (setq uses-stdin nil)
1017         (push (shell-quote-argument
1018                (gnus-map-function mm-path-name-rewrite-functions file)) out))
1019        ((string= total "%t")
1020         (push (shell-quote-argument (car type-list)) out))
1021        (t
1022         (push (shell-quote-argument (or (cdr (assq (intern sub) ctl)) "")) out))))
1023     (push (substring method beg (length method)) out)
1024     (when uses-stdin
1025       (push "<" out)
1026       (push (shell-quote-argument
1027              (gnus-map-function mm-path-name-rewrite-functions file))
1028             out))
1029     (mapconcat 'identity (nreverse out) "")))
1030
1031 (defun mm-remove-parts (handles)
1032   "Remove the displayed MIME parts represented by HANDLES."
1033   (if (and (listp handles)
1034            (bufferp (car handles)))
1035       (mm-remove-part handles)
1036     (let (handle)
1037       (while (setq handle (pop handles))
1038         (cond
1039          ((stringp handle)
1040           (when (buffer-live-p (get-text-property 0 'buffer handle))
1041             (kill-buffer (get-text-property 0 'buffer handle))))
1042          ((and (listp handle)
1043                (stringp (car handle)))
1044           (mm-remove-parts (cdr handle)))
1045          (t
1046           (mm-remove-part handle)))))))
1047
1048 (defun mm-destroy-parts (handles)
1049   "Remove the displayed MIME parts represented by HANDLES."
1050   (if (and (listp handles)
1051            (bufferp (car handles)))
1052       (mm-destroy-part handles)
1053     (let (handle)
1054       (while (setq handle (pop handles))
1055         (cond
1056          ((stringp handle)
1057           (when (buffer-live-p (get-text-property 0 'buffer handle))
1058             (kill-buffer (get-text-property 0 'buffer handle))))
1059          ((and (listp handle)
1060                (stringp (car handle)))
1061           (mm-destroy-parts handle))
1062          (t
1063           (mm-destroy-part handle)))))))
1064
1065 (defun mm-remove-part (handle)
1066   "Remove the displayed MIME part represented by HANDLE."
1067   (when (listp handle)
1068     (let ((object (mm-handle-undisplayer handle)))
1069       (ignore-errors
1070         (cond
1071          ;; Internally displayed part.
1072          ((mm-annotationp object)
1073           (if (featurep 'xemacs)
1074               (delete-annotation object)))
1075          ((or (functionp object)
1076               (and (listp object)
1077                    (eq (car object) 'lambda)))
1078           (funcall object))
1079          ;; Externally displayed part.
1080          ((consp object)
1081           (condition-case ()
1082               (while (get-buffer-process (cdr object))
1083                 (interrupt-process (get-buffer-process (cdr object)))
1084                 (message "Waiting for external displayer to die...")
1085                 (sit-for 1))
1086             (quit)
1087             (error))
1088           (ignore-errors (and (cdr object) (kill-buffer (cdr object))))
1089           (message "Waiting for external displayer to die...done")
1090           (ignore-errors (delete-file (car object)))
1091           (ignore-errors (delete-directory (file-name-directory
1092                                             (car object)))))
1093          ((bufferp object)
1094           (when (buffer-live-p object)
1095             (kill-buffer object)))))
1096       (mm-handle-set-undisplayer handle nil))))
1097
1098 (defun mm-display-inline (handle)
1099   (let* ((type (mm-handle-media-type handle))
1100          (function (cadr (mm-assoc-string-match mm-inline-media-tests type))))
1101     (funcall function handle)
1102     (goto-char (point-min))))
1103
1104 (defun mm-assoc-string-match (alist type)
1105   (dolist (elem alist)
1106     (when (string-match (car elem) type)
1107       (return elem))))
1108
1109 (defun mm-automatic-display-p (handle)
1110   "Say whether the user wants HANDLE to be displayed automatically."
1111   (let ((methods mm-automatic-display)
1112         (type (mm-handle-media-type handle))
1113         method result)
1114     (while (setq method (pop methods))
1115       (when (and (not (mm-inline-override-p handle))
1116                  (string-match method type))
1117         (setq result t
1118               methods nil)))
1119     result))
1120
1121 (defun mm-inlinable-p (handle &optional type)
1122   "Say whether HANDLE can be displayed inline.
1123 TYPE is the mime-type of the object; it defaults to the one given
1124 in HANDLE."
1125   (unless type (setq type (mm-handle-media-type handle)))
1126   (let ((alist mm-inline-media-tests)
1127         test)
1128     (while alist
1129       (when (string-match (caar alist) type)
1130         (setq test (caddar alist)
1131               alist nil)
1132         (setq test (funcall test handle)))
1133       (pop alist))
1134     test))
1135
1136 (defun mm-inlined-p (handle)
1137   "Say whether the user wants HANDLE to be displayed inline."
1138   (let ((methods mm-inlined-types)
1139         (type (mm-handle-media-type handle))
1140         method result)
1141     (while (setq method (pop methods))
1142       (when (and (not (mm-inline-override-p handle))
1143                  (string-match method type))
1144         (setq result t
1145               methods nil)))
1146     result))
1147
1148 (defun mm-attachment-override-p (handle)
1149   "Say whether HANDLE should have attachment behavior overridden."
1150   (let ((types mm-attachment-override-types)
1151         (type (mm-handle-media-type handle))
1152         ty)
1153     (catch 'found
1154       (while (setq ty (pop types))
1155         (when (and (string-match ty type)
1156                    (mm-inlinable-p handle))
1157           (throw 'found t))))))
1158
1159 (defun mm-inline-override-p (handle)
1160   "Say whether HANDLE should have inline behavior overridden."
1161   (let ((types mm-inline-override-types)
1162         (type (mm-handle-media-type handle))
1163         ty)
1164     (catch 'found
1165       (while (setq ty (pop types))
1166         (when (string-match ty type)
1167           (throw 'found t))))))
1168
1169 (defun mm-automatic-external-display-p (type)
1170   "Return the user-defined method for TYPE."
1171   (let ((methods mm-automatic-external-display)
1172         method result)
1173     (while (setq method (pop methods))
1174       (when (string-match method type)
1175         (setq result t
1176               methods nil)))
1177     result))
1178
1179 (defun mm-destroy-part (handle)
1180   "Destroy the data structures connected to HANDLE."
1181   (when (listp handle)
1182     (mm-remove-part handle)
1183     (when (buffer-live-p (mm-handle-buffer handle))
1184       (kill-buffer (mm-handle-buffer handle)))))
1185
1186 (defun mm-handle-displayed-p (handle)
1187   "Say whether HANDLE is displayed or not."
1188   (mm-handle-undisplayer handle))
1189
1190 ;;;
1191 ;;; Functions for outputting parts
1192 ;;;
1193
1194 (defmacro mm-with-part (handle &rest forms)
1195   "Run FORMS in the temp buffer containing the contents of HANDLE."
1196   ;; The handle-buffer's content is a sequence of bytes, not a sequence of
1197   ;; chars, so the buffer should be unibyte.  It may happen that the
1198   ;; handle-buffer is multibyte for some reason, in which case now is a good
1199   ;; time to adjust it, since we know at this point that it should
1200   ;; be unibyte.
1201   `(let* ((handle ,handle))
1202      (when (and (mm-handle-buffer handle)
1203                 (buffer-name (mm-handle-buffer handle)))
1204        (with-temp-buffer
1205          (mm-disable-multibyte)
1206          (insert-buffer-substring (mm-handle-buffer handle))
1207          (mm-decode-content-transfer-encoding
1208           (mm-handle-encoding handle)
1209           (mm-handle-media-type handle))
1210          ,@forms))))
1211 (put 'mm-with-part 'lisp-indent-function 1)
1212 (put 'mm-with-part 'edebug-form-spec '(body))
1213
1214 (defun mm-get-part (handle &optional no-cache)
1215   "Return the contents of HANDLE as a string.
1216 If NO-CACHE is non-nil, cached contents of a message/external-body part
1217 are ignored."
1218   (if (and (not no-cache)
1219            (equal (mm-handle-media-type handle) "message/external-body"))
1220       (progn
1221         (unless (mm-handle-cache handle)
1222           (mm-extern-cache-contents handle))
1223         (with-current-buffer (mm-handle-buffer (mm-handle-cache handle))
1224           (buffer-string)))
1225     (mm-with-part handle
1226       (buffer-string))))
1227
1228 (defun mm-insert-part (handle &optional no-cache)
1229   "Insert the contents of HANDLE in the current buffer.
1230 If NO-CACHE is non-nil, cached contents of a message/external-body part
1231 are ignored."
1232   (let ((text (cond ((eq (mail-content-type-get (mm-handle-type handle)
1233                                                 'charset)
1234                          'gnus-decoded)
1235                      (with-current-buffer (mm-handle-buffer handle)
1236                        (buffer-string)))
1237                     ((mm-multibyte-p)
1238                      (mm-string-to-multibyte (mm-get-part handle no-cache)))
1239                     (t
1240                      (mm-get-part handle no-cache)))))
1241     (save-restriction
1242       (widen)
1243       (goto-char
1244        (prog1
1245            (point)
1246          (if (and (eq (get-char-property (max (point-min) (1- (point))) 'face)
1247                       'mm-uu-extract)
1248                   (eq (get-char-property 0 'face text) 'mm-uu-extract))
1249              ;; Separate the extracted parts that have the same faces.
1250              (insert "\n" text)
1251            (insert text)))))))
1252
1253 (defun mm-file-name-delete-whitespace (file-name)
1254   "Remove all whitespace characters from FILE-NAME."
1255   (while (string-match "\\s-+" file-name)
1256     (setq file-name (replace-match "" t t file-name)))
1257   file-name)
1258
1259 (defun mm-file-name-trim-whitespace (file-name)
1260   "Remove leading and trailing whitespace characters from FILE-NAME."
1261   (when (string-match "\\`\\s-+" file-name)
1262     (setq file-name (substring file-name (match-end 0))))
1263   (when (string-match "\\s-+\\'" file-name)
1264     (setq file-name (substring file-name 0 (match-beginning 0))))
1265   file-name)
1266
1267 (defun mm-file-name-collapse-whitespace (file-name)
1268   "Collapse multiple whitespace characters in FILE-NAME."
1269   (while (string-match "\\s-\\s-+" file-name)
1270     (setq file-name (replace-match " " t t file-name)))
1271   file-name)
1272
1273 (defun mm-file-name-replace-whitespace (file-name)
1274   "Replace whitespace characters in FILE-NAME with underscores.
1275 Set the option `mm-file-name-replace-whitespace' to any other
1276 string if you do not like underscores."
1277   (let ((s (or mm-file-name-replace-whitespace "_")))
1278     (while (string-match "\\s-" file-name)
1279       (setq file-name (replace-match s t t file-name))))
1280   file-name)
1281
1282 (defun mm-file-name-delete-control (filename)
1283   "Delete control characters from FILENAME."
1284   (gnus-replace-in-string filename "[\x00-\x1f\x7f]" ""))
1285
1286 (defun mm-file-name-delete-gotchas (filename)
1287   "Delete shell gotchas from FILENAME."
1288   (setq filename (gnus-replace-in-string filename "[<>|]" ""))
1289   (gnus-replace-in-string filename "^[.-]+" ""))
1290
1291 (defun mm-save-part (handle &optional prompt)
1292   "Write HANDLE to a file.
1293 PROMPT overrides the default one used to ask user for a file name."
1294   (let ((filename (or (mail-content-type-get
1295                        (mm-handle-disposition handle) 'filename)
1296                       (mail-content-type-get
1297                        (mm-handle-type handle) 'name)))
1298         file)
1299     (when filename
1300       (setq filename (gnus-map-function mm-file-name-rewrite-functions
1301                                         (file-name-nondirectory filename))))
1302     (while
1303         (progn
1304           (setq file
1305                 (read-file-name
1306                  (or prompt
1307                      (format "Save MIME part to (default %s): "
1308                              (or filename "")))
1309                  (or mm-default-directory default-directory)
1310                  (expand-file-name (or filename "")
1311                                    (or mm-default-directory default-directory))))
1312           (cond ((or (not file) (equal file ""))
1313                  (message "Please enter a file name")
1314                  t)
1315                 ((and (file-directory-p file)
1316                       (not filename))
1317                  (message "Please enter a non-directory file name")
1318                  t)
1319                 (t nil)))
1320       (sit-for 2)
1321       (discard-input))
1322     (if (file-directory-p file)
1323         (setq file (expand-file-name filename file))
1324       (setq file (expand-file-name
1325                   file (or mm-default-directory default-directory))))
1326     (setq mm-default-directory (file-name-directory file))
1327     (and (or (not (file-exists-p file))
1328              (yes-or-no-p (format "File %s already exists; overwrite? "
1329                                   file)))
1330          (progn
1331            (mm-save-part-to-file handle file)
1332            file))))
1333
1334 (defun mm-add-meta-html-tag (handle &optional charset force-charset)
1335   "Add meta html tag to specify CHARSET of HANDLE in the current buffer.
1336 CHARSET defaults to the one HANDLE specifies.  Existing meta tag that
1337 specifies charset will not be modified unless FORCE-CHARSET is non-nil.
1338 Return t if meta tag is added or replaced."
1339   (when (equal (mm-handle-media-type handle) "text/html")
1340     (when (or charset
1341               (setq charset (mail-content-type-get (mm-handle-type handle)
1342                                                    'charset)))
1343       (setq charset (format "\
1344 <meta http-equiv=\"Content-Type\" content=\"text/html; charset=%s\">" charset))
1345       (let ((case-fold-search t))
1346         (goto-char (point-min))
1347         (if (re-search-forward "\
1348 <meta\\s-+http-equiv=[\"']?content-type[\"']?\\s-+content=[\"']\
1349 text/\\(\\sw+\\)\\(?:\;\\s-*charset=\\(.+\\)\\)?[\"'][^>]*>" nil t)
1350             (if (and (not force-charset)
1351                      (match-beginning 2)
1352                      (string-match "\\`html\\'" (match-string 1)))
1353                 ;; Don't modify existing meta tag.
1354                 nil
1355               ;; Replace it with the one specifying charset.
1356               (replace-match charset)
1357               t)
1358           (if (re-search-forward "<head>\\s-*" nil t)
1359               (insert charset "\n")
1360             (re-search-forward "<html\\(?:\\s-+[^>]+\\|\\s-*\\)>\\s-*" nil t)
1361             (insert "<head>\n" charset "\n</head>\n"))
1362           t)))))
1363
1364 (defun mm-save-part-to-file (handle file)
1365   (mm-with-unibyte-buffer
1366     (mm-insert-part handle)
1367     (mm-add-meta-html-tag handle)
1368     (let ((current-file-modes (default-file-modes)))
1369       (set-default-file-modes mm-attachment-file-modes)
1370       (unwind-protect
1371           ;; Don't re-compress .gz & al.  Arguably we should make
1372           ;; `file-name-handler-alist' nil, but that would chop
1373           ;; ange-ftp, which is reasonable to use here.
1374           (mm-write-region (point-min) (point-max) file nil nil nil 'binary t)
1375         (set-default-file-modes current-file-modes)))))
1376
1377 (defun mm-pipe-part (handle &optional cmd)
1378   "Pipe HANDLE to a process.
1379 Use CMD as the process."
1380   (let ((name (mail-content-type-get (mm-handle-type handle) 'name))
1381         (command (or cmd
1382                      (gnus-read-shell-command
1383                       "Shell command on MIME part: " mm-last-shell-command))))
1384     (mm-with-unibyte-buffer
1385       (mm-insert-part handle)
1386       (mm-add-meta-html-tag handle)
1387       (let ((coding-system-for-write 'binary))
1388         (shell-command-on-region (point-min) (point-max) command nil)))))
1389
1390 (autoload 'gnus-completing-read "gnus-util")
1391
1392 (defun mm-interactively-view-part (handle)
1393   "Display HANDLE using METHOD."
1394   (let* ((type (mm-handle-media-type handle))
1395          (methods
1396           (mapcar (lambda (i) (cdr (assoc 'viewer i)))
1397                   (mailcap-mime-info type 'all)))
1398          (method (let ((minibuffer-local-completion-map
1399                         mm-viewer-completion-map))
1400                    (completing-read "Viewer: " methods))))
1401     (when (string= method "")
1402       (error "No method given"))
1403     (if (string-match "^[^% \t]+$" method)
1404         (setq method (concat method " %s")))
1405     (mm-display-external handle method)))
1406
1407 (defun mm-preferred-alternative (handles &optional preferred)
1408   "Say which of HANDLES are preferred."
1409   (let ((prec (if preferred (list preferred)
1410                 (mm-preferred-alternative-precedence handles)))
1411         p h result type handle)
1412     (while (setq p (pop prec))
1413       (setq h handles)
1414       (while h
1415         (setq handle (car h))
1416         (setq type (mm-handle-media-type handle))
1417         (when (and (equal p type)
1418                    (mm-automatic-display-p handle)
1419                    (or (stringp (car handle))
1420                        (not (mm-handle-disposition handle))
1421                        (equal (car (mm-handle-disposition handle))
1422                               "inline")))
1423           (setq result handle
1424                 h nil
1425                 prec nil))
1426         (pop h)))
1427     result))
1428
1429 (defun mm-preferred-alternative-precedence (handles)
1430   "Return the precedence based on HANDLES and `mm-discouraged-alternatives'."
1431   (setq handles (reverse handles))
1432   (dolist (disc (reverse mm-discouraged-alternatives))
1433     (dolist (handle (copy-sequence handles))
1434       (when (string-match disc (mm-handle-media-type handle))
1435         (setq handles (nconc (delete handle handles) (list handle))))))
1436   ;; Remove empty parts.
1437   (dolist (handle (copy-sequence handles))
1438     (when (and (bufferp (mm-handle-buffer handle))
1439                (not (with-current-buffer (mm-handle-buffer handle)
1440                       (goto-char (point-min))
1441                       (re-search-forward "[^ \t\n]" nil t))))
1442       (setq handles (nconc (delete handle handles) (list handle)))))
1443   (mapcar #'mm-handle-media-type handles))
1444
1445 (defun mm-get-content-id (id)
1446   "Return the handle(s) referred to by ID."
1447   (cdr (assoc id mm-content-id-alist)))
1448
1449 (defconst mm-image-type-regexps
1450   '(("/\\*.*XPM.\\*/" . xpm)
1451     ("P[1-6]" . pbm)
1452     ("GIF8" . gif)
1453     ("\377\330" . jpeg)
1454     ("\211PNG\r\n" . png)
1455     ("#define" . xbm)
1456     ("\\(MM\0\\*\\)\\|\\(II\\*\0\\)" . tiff)
1457     ("%!PS" . postscript))
1458   "Alist of (REGEXP . IMAGE-TYPE) pairs used to auto-detect image types.
1459 When the first bytes of an image file match REGEXP, it is assumed to
1460 be of image type IMAGE-TYPE.")
1461
1462 ;; Steal from image.el. image-type-from-data suffers multi-line matching bug.
1463 (defun mm-image-type-from-buffer ()
1464   "Determine the image type from data in the current buffer.
1465 Value is a symbol specifying the image type or nil if type cannot
1466 be determined."
1467   (let ((types mm-image-type-regexps)
1468         type)
1469     (goto-char (point-min))
1470     (while (and types (null type))
1471       (let ((regexp (car (car types)))
1472             (image-type (cdr (car types))))
1473         (when (looking-at regexp)
1474           (setq type image-type))
1475         (setq types (cdr types))))
1476     type))
1477
1478 (defun mm-get-image (handle)
1479   "Return an image instance based on HANDLE."
1480   (let ((type (mm-handle-media-subtype handle))
1481         spec)
1482     ;; Allow some common translations.
1483     (setq type
1484           (cond
1485            ((equal type "x-pixmap")
1486             "xpm")
1487            ((equal type "x-xbitmap")
1488             "xbm")
1489            ((equal type "x-portable-bitmap")
1490             "pbm")
1491            (t type)))
1492     (or (mm-handle-cache handle)
1493         (mm-with-unibyte-buffer
1494           (mm-insert-part handle)
1495           (prog1
1496               (setq spec
1497                     (ignore-errors
1498                       ;; Avoid testing `make-glyph' since W3 may define
1499                       ;; a bogus version of it.
1500                       (if (fboundp 'create-image)
1501                           (create-image (buffer-string)
1502                                         (or (mm-image-type-from-buffer)
1503                                             (intern type))
1504                                         'data-p)
1505                         (mm-create-image-xemacs type))))
1506             (mm-handle-set-cache handle spec))))))
1507
1508 (defun mm-create-image-xemacs (type)
1509   (when (featurep 'xemacs)
1510     (cond
1511      ((equal type "xbm")
1512       ;; xbm images require special handling, since
1513       ;; the only way to create glyphs from these
1514       ;; (without a ton of work) is to write them
1515       ;; out to a file, and then create a file
1516       ;; specifier.
1517       (let ((file (mm-make-temp-file
1518                    (expand-file-name "emm" mm-tmp-directory)
1519                    nil ".xbm")))
1520         (unwind-protect
1521             (progn
1522               (write-region (point-min) (point-max) file)
1523               (make-glyph (list (cons 'x file))))
1524           (ignore-errors
1525             (delete-file file)))))
1526      (t
1527       (make-glyph
1528        (vector
1529         (or (mm-image-type-from-buffer)
1530             (intern type))
1531         :data (buffer-string)))))))
1532
1533 (declare-function image-size "image.c" (spec &optional pixels frame))
1534
1535 (defun mm-image-fit-p (handle)
1536   "Say whether the image in HANDLE will fit the current window."
1537   (let ((image (mm-get-image handle)))
1538     (or (not image)
1539         (if (featurep 'xemacs)
1540             ;; XEmacs's glyphs can actually tell us about their width, so
1541             ;; let's be nice and smart about them.
1542             (or mm-inline-large-images
1543                 (and (<= (glyph-width image) (window-pixel-width))
1544                      (<= (glyph-height image) (window-pixel-height))))
1545           (let* ((size (image-size image))
1546                  (w (car size))
1547                  (h (cdr size)))
1548             (or mm-inline-large-images
1549                 (and (<= h (1- (window-height))) ; Don't include mode line.
1550                      (<= w (window-width)))))))))
1551
1552 (defun mm-valid-image-format-p (format)
1553   "Say whether FORMAT can be displayed natively by Emacs."
1554   (cond
1555    ;; Handle XEmacs
1556    ((fboundp 'valid-image-instantiator-format-p)
1557     (valid-image-instantiator-format-p format))
1558    ;; Handle Emacs
1559    ((fboundp 'image-type-available-p)
1560     (and (display-graphic-p)
1561          (image-type-available-p format)))
1562    ;; Nobody else can do images yet.
1563    (t
1564     nil)))
1565
1566 (defun mm-valid-and-fit-image-p (format handle)
1567   "Say whether FORMAT can be displayed natively and HANDLE fits the window."
1568   (and (mm-valid-image-format-p format)
1569        (mm-image-fit-p handle)))
1570
1571 (defun mm-find-part-by-type (handles type &optional notp recursive)
1572   "Search in HANDLES for part with TYPE.
1573 If NOTP, returns first non-matching part.
1574 If RECURSIVE, search recursively."
1575   (let (handle)
1576     (while handles
1577       (if (and recursive (stringp (caar handles)))
1578           (if (setq handle (mm-find-part-by-type (cdar handles) type
1579                                                  notp recursive))
1580               (setq handles nil))
1581         (if (if notp
1582                 (not (equal (mm-handle-media-type (car handles)) type))
1583               (equal (mm-handle-media-type (car handles)) type))
1584             (setq handle (car handles)
1585                   handles nil)))
1586       (setq handles (cdr handles)))
1587     handle))
1588
1589 (defun mm-find-raw-part-by-type (ctl type &optional notp)
1590   (goto-char (point-min))
1591   (let* ((boundary (concat "--" (mm-handle-multipart-ctl-parameter ctl
1592                                                                    'boundary)))
1593          (close-delimiter (concat "^" (regexp-quote boundary) "--[ \t]*$"))
1594          start
1595          (end (save-excursion
1596                 (goto-char (point-max))
1597                 (if (re-search-backward close-delimiter nil t)
1598                     (match-beginning 0)
1599                   (point-max))))
1600          result)
1601     (setq boundary (concat "^" (regexp-quote boundary) "[ \t]*$"))
1602     (while (and (not result)
1603                 (re-search-forward boundary end t))
1604       (goto-char (match-beginning 0))
1605       (when start
1606         (save-excursion
1607           (save-restriction
1608             (narrow-to-region start (1- (point)))
1609             (when (let* ((ct (mail-fetch-field "content-type"))
1610                          (ctl (and ct (mail-header-parse-content-type ct))))
1611                     (if notp
1612                         (not (equal (car ctl) type))
1613                       (equal (car ctl) type)))
1614               (setq result (buffer-string))))))
1615       (forward-line 1)
1616       (setq start (point)))
1617     (when (and (not result) start)
1618       (save-excursion
1619         (save-restriction
1620           (narrow-to-region start end)
1621           (when (let* ((ct (mail-fetch-field "content-type"))
1622                        (ctl (and ct (mail-header-parse-content-type ct))))
1623                   (if notp
1624                       (not (equal (car ctl) type))
1625                     (equal (car ctl) type)))
1626             (setq result (buffer-string))))))
1627     result))
1628
1629 (defvar mm-security-handle nil)
1630
1631 (defsubst mm-set-handle-multipart-parameter (handle parameter value)
1632   ;; HANDLE could be a CTL.
1633   (when handle
1634     (put-text-property 0 (length (car handle)) parameter value
1635                        (car handle))))
1636
1637 (autoload 'mm-view-pkcs7 "mm-view")
1638
1639 (defun mm-possibly-verify-or-decrypt (parts ctl &optional from)
1640   (let ((type (car ctl))
1641         (subtype (cadr (split-string (car ctl) "/")))
1642         (mm-security-handle ctl) ;; (car CTL) is the type.
1643         protocol func functest)
1644     (cond
1645      ((or (equal type "application/x-pkcs7-mime")
1646           (equal type "application/pkcs7-mime"))
1647       (with-temp-buffer
1648         (when (and (cond
1649                     ((eq mm-decrypt-option 'never) nil)
1650                     ((eq mm-decrypt-option 'always) t)
1651                     ((eq mm-decrypt-option 'known) t)
1652                     (t (y-or-n-p
1653                         (format "Decrypt (S/MIME) part? "))))
1654                    (mm-view-pkcs7 parts from))
1655           (setq parts (mm-dissect-buffer t)))))
1656      ((equal subtype "signed")
1657       (unless (and (setq protocol
1658                          (mm-handle-multipart-ctl-parameter ctl 'protocol))
1659                    (not (equal protocol "multipart/mixed")))
1660         ;; The message is broken or draft-ietf-openpgp-multsig-01.
1661         (let ((protocols mm-verify-function-alist))
1662           (while protocols
1663             (if (and (or (not (setq functest (nth 3 (car protocols))))
1664                          (funcall functest parts ctl))
1665                      (mm-find-part-by-type parts (caar protocols) nil t))
1666                 (setq protocol (caar protocols)
1667                       protocols nil)
1668               (setq protocols (cdr protocols))))))
1669       (setq func (nth 1 (assoc protocol mm-verify-function-alist)))
1670       (when (cond
1671              ((eq mm-verify-option 'never) nil)
1672              ((eq mm-verify-option 'always) t)
1673              ((eq mm-verify-option 'known)
1674               (and func
1675                    (or (not (setq functest
1676                                   (nth 3 (assoc protocol
1677                                                 mm-verify-function-alist))))
1678                        (funcall functest parts ctl))))
1679              (t
1680               (y-or-n-p
1681                (format "Verify signed (%s) part? "
1682                        (or (nth 2 (assoc protocol mm-verify-function-alist))
1683                            (format "protocol=%s" protocol))))))
1684         (save-excursion
1685           (if func
1686               (setq parts (funcall func parts ctl))
1687             (mm-set-handle-multipart-parameter
1688              mm-security-handle 'gnus-details
1689              (format "Unknown sign protocol (%s)" protocol))))))
1690      ((equal subtype "encrypted")
1691       (unless (setq protocol
1692                     (mm-handle-multipart-ctl-parameter ctl 'protocol))
1693         ;; The message is broken.
1694         (let ((parts parts))
1695           (while parts
1696             (if (assoc (mm-handle-media-type (car parts))
1697                        mm-decrypt-function-alist)
1698                 (setq protocol (mm-handle-media-type (car parts))
1699                       parts nil)
1700               (setq parts (cdr parts))))))
1701       (setq func (nth 1 (assoc protocol mm-decrypt-function-alist)))
1702       (when (cond
1703              ((eq mm-decrypt-option 'never) nil)
1704              ((eq mm-decrypt-option 'always) t)
1705              ((eq mm-decrypt-option 'known)
1706               (and func
1707                    (or (not (setq functest
1708                                   (nth 3 (assoc protocol
1709                                                 mm-decrypt-function-alist))))
1710                        (funcall functest parts ctl))))
1711              (t
1712               (y-or-n-p
1713                (format "Decrypt (%s) part? "
1714                        (or (nth 2 (assoc protocol mm-decrypt-function-alist))
1715                            (format "protocol=%s" protocol))))))
1716         (save-excursion
1717           (if func
1718               (setq parts (funcall func parts ctl))
1719             (mm-set-handle-multipart-parameter
1720              mm-security-handle 'gnus-details
1721              (format "Unknown encrypt protocol (%s)" protocol))))))
1722      (t nil))
1723     parts))
1724
1725 (defun mm-multiple-handles (handles)
1726   (and (listp handles)
1727        (> (length handles) 1)
1728        (or (listp (car handles))
1729            (stringp (car handles)))))
1730
1731 (defun mm-complicated-handles (handles)
1732   (and (listp (car handles))
1733        (> (length handles) 1)))
1734
1735 (defun mm-merge-handles (handles1 handles2)
1736   (append
1737    (if (listp (car handles1))
1738        handles1
1739      (list handles1))
1740    (if (listp (car handles2))
1741        handles2
1742      (list handles2))))
1743
1744 (defun mm-readable-p (handle)
1745   "Say whether the content of HANDLE is readable."
1746   (and (< (with-current-buffer (mm-handle-buffer handle)
1747             (buffer-size)) 10000)
1748        (mm-with-unibyte-buffer
1749          (mm-insert-part handle)
1750          (and (eq (mm-body-7-or-8) '7bit)
1751               (not (mm-long-lines-p 76))))))
1752
1753 (declare-function libxml-parse-html-region "xml.c"
1754                   (start end &optional base-url))
1755 (declare-function shr-insert-document "shr" (dom))
1756 (defvar shr-blocked-images)
1757 (defvar gnus-inhibit-images)
1758 (autoload 'gnus-blocked-images "gnus-art")
1759
1760 (defun mm-shr (handle)
1761   ;; Require since we bind its variables.
1762   (require 'shr)
1763   (let ((article-buffer (current-buffer))
1764         (shr-content-function (lambda (id)
1765                                 (let ((handle (mm-get-content-id id)))
1766                                   (when handle
1767                                     (mm-with-part handle
1768                                       (buffer-string))))))
1769         shr-inhibit-images shr-blocked-images charset char)
1770     (if (and (boundp 'gnus-summary-buffer)
1771              (bufferp gnus-summary-buffer)
1772              (buffer-name gnus-summary-buffer))
1773         (with-current-buffer gnus-summary-buffer
1774           (setq shr-inhibit-images gnus-inhibit-images
1775                 shr-blocked-images (gnus-blocked-images)))
1776       (setq shr-inhibit-images gnus-inhibit-images
1777             shr-blocked-images (gnus-blocked-images)))
1778     (unless handle
1779       (setq handle (mm-dissect-buffer t)))
1780     (setq charset (mail-content-type-get (mm-handle-type handle) 'charset))
1781     (save-restriction
1782       (narrow-to-region (point) (point))
1783       (shr-insert-document
1784        (mm-with-part handle
1785          (insert (prog1
1786                      (if (and charset
1787                               (setq charset
1788                                     (mm-charset-to-coding-system charset
1789                                                                  nil t))
1790                               (not (eq charset 'ascii)))
1791                          (mm-decode-coding-string (buffer-string) charset)
1792                        (mm-string-as-multibyte (buffer-string)))
1793                    (erase-buffer)
1794                    (mm-enable-multibyte)))
1795          (goto-char (point-min))
1796          (setq case-fold-search t)
1797          (while (re-search-forward
1798                  "&#\\(?:x\\([89][0-9a-f]\\)\\|\\(1[2-5][0-9]\\)\\);" nil t)
1799            (when (setq char
1800                        (cdr (assq (if (match-beginning 1)
1801                                       (string-to-number (match-string 1) 16)
1802                                     (string-to-number (match-string 2)))
1803                                   mm-extra-numeric-entities)))
1804              (replace-match (char-to-string char))))
1805          ;; Remove "soft hyphens".
1806          (goto-char (point-min))
1807          (while (search-forward "" nil t)
1808            (replace-match "" t t))
1809          (libxml-parse-html-region (point-min) (point-max))))
1810       (unless (bobp)
1811         (insert "\n"))
1812       (mm-convert-shr-links)
1813       (mm-handle-set-undisplayer
1814        handle
1815        `(lambda ()
1816           (let ((inhibit-read-only t))
1817             (delete-region ,(point-min-marker)
1818                            ,(point-max-marker))))))))
1819
1820 (defvar shr-map)
1821
1822 (autoload 'widget-convert-button "wid-edit")
1823
1824 (defun mm-convert-shr-links ()
1825   (let ((start (point-min))
1826         end)
1827     (while (and start
1828                 (< start (point-max)))
1829       (when (setq start (text-property-not-all start (point-max) 'shr-url nil))
1830         (setq end (next-single-property-change start 'shr-url nil (point-max)))
1831         (widget-convert-button
1832          'url-link start end
1833          :help-echo (get-text-property start 'help-echo)
1834          :keymap shr-map
1835          (get-text-property start 'shr-url))
1836         (put-text-property start end 'local-map nil)
1837         (setq start end)))))
1838
1839 (defun mm-handle-filename (handle)
1840   "Return filename of HANDLE if any."
1841   (or (mail-content-type-get (mm-handle-type handle)
1842                              'name)
1843       (mail-content-type-get (mm-handle-disposition handle)
1844                              'filename)))
1845
1846 (provide 'mm-decode)
1847
1848 ;; Local Variables:
1849 ;; coding: utf-8
1850 ;; End:
1851
1852 ;;; mm-decode.el ends here