code.delx.au - gnu-emacs/blob - 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 (defface mm-command-output
  67   '((((class color)
  68       (background dark))
  69      (:foreground "ForestGreen"))
  70     (((class color)
  71       (background light))
  72      (:foreground "red3"))
  73     (t
  74      (:italic t)))
  75   "Face used for displaying output from commands."
  76   :group 'mime-display)
  77
  78 ;;; Convenience macros.
  79
  80 (defmacro mm-handle-buffer (handle)
  81   `(nth 0 ,handle))
  82 (defmacro mm-handle-type (handle)
  83   `(nth 1 ,handle))
  84 (defsubst mm-handle-media-type (handle)
  85   (if (stringp (car handle))
  86       (car handle)
  87     (car (mm-handle-type handle))))
  88 (defsubst mm-handle-media-supertype (handle)
  89   (car (split-string (mm-handle-media-type handle) "/")))
  90 (defsubst mm-handle-media-subtype (handle)
  91   (cadr (split-string (mm-handle-media-type handle) "/")))
  92 (defmacro mm-handle-encoding (handle)
  93   `(nth 2 ,handle))
  94 (defmacro mm-handle-undisplayer (handle)
  95   `(nth 3 ,handle))
  96 (defmacro mm-handle-set-undisplayer (handle function)
  97   `(setcar (nthcdr 3 ,handle) ,function))
  98 (defmacro mm-handle-disposition (handle)
  99   `(nth 4 ,handle))
 100 (defmacro mm-handle-description (handle)
 101   `(nth 5 ,handle))
 102 (defmacro mm-handle-cache (handle)
 103   `(nth 6 ,handle))
 104 (defmacro mm-handle-set-cache (handle contents)
 105   `(setcar (nthcdr 6 ,handle) ,contents))
 106 (defmacro mm-handle-id (handle)
 107   `(nth 7 ,handle))
 108 (defmacro mm-handle-multipart-original-buffer (handle)
 109   `(get-text-property 0 'buffer (car ,handle)))
 110 (defmacro mm-handle-multipart-from (handle)
 111   `(get-text-property 0 'from (car ,handle)))
 112 (defmacro mm-handle-multipart-ctl-parameter (handle parameter)
 113   `(get-text-property 0 ,parameter (car ,handle)))
 114
 115 (defmacro mm-make-handle (&optional buffer type encoding undisplayer
 116                                     disposition description cache
 117                                     id)
 118   `(list ,buffer ,type ,encoding ,undisplayer
 119          ,disposition ,description ,cache ,id))
 120
 121 (defcustom mm-text-html-renderer
 122   (cond ((fboundp 'libxml-parse-html-region) 'shr)
 123         ((executable-find "w3m") 'gnus-w3m)
 124         ((executable-find "links") 'links)
 125         ((executable-find "lynx") 'lynx)
 126         ((locate-library "w3") 'w3)
 127         ((locate-library "html2text") 'html2text)
 128         (t nil))
 129   "Render of HTML contents.
 130 It is one of defined renderer types, or a rendering function.
 131 The defined renderer types are:
 132 `shr': use the built-in Gnus HTML renderer;
 133 `gnus-w3m': use Gnus renderer based on w3m;
 134 `w3m': use emacs-w3m;
 135 `w3m-standalone': use plain w3m;
 136 `links': use links;
 137 `lynx': use lynx;
 138 `w3': use Emacs/W3;
 139 `html2text': use html2text;
 140 nil    : use external viewer (default web browser)."
 141   :version "24.1"
 142   :type '(choice (const shr)
 143                  (const gnus-w3m)
 144                  (const w3)
 145                  (const w3m :tag "emacs-w3m")
 146                  (const w3m-standalone :tag "standalone w3m" )
 147                  (const links)
 148                  (const lynx)
 149                  (const html2text)
 150                  (const nil :tag "External viewer")
 151                  (function))
 152   :group 'mime-display)
 153
 154 (defcustom mm-inline-text-html-with-images nil
 155   "If non-nil, Gnus will allow retrieving images in HTML contents with
 156 the <img> tags.  It has no effect on Emacs/w3.  See also the
 157 documentation for the `mm-w3m-safe-url-regexp' variable."
 158   :version "22.1"
 159   :type 'boolean
 160   :group 'mime-display)
 161
 162 (defcustom mm-w3m-safe-url-regexp "\\`cid:"
 163   "Regexp matching URLs which are considered to be safe.
 164 Some HTML mails might contain a nasty trick used by spammers, using
 165 the <img> tag which is far more evil than the [Click Here!] button.
 166 It is most likely intended to check whether the ominous spam mail has
 167 reached your eyes or not, in which case the spammer knows for sure
 168 that your email address is valid.  It is done by embedding an
 169 identifier string into a URL that you might automatically retrieve
 170 when displaying the image.  The default value is \"\\\\`cid:\" which only
 171 matches parts embedded to the Multipart/Related type MIME contents and
 172 Gnus will never connect to the spammer's site arbitrarily.  You may
 173 set this variable to nil if you consider all urls to be safe."
 174   :version "22.1"
 175   :type '(choice (regexp :tag "Regexp")
 176                  (const :tag "All URLs are safe" nil))
 177   :group 'mime-display)
 178
 179 (defcustom mm-inline-text-html-with-w3m-keymap t
 180   "If non-nil, use emacs-w3m command keys in the article buffer."
 181   :version "22.1"
 182   :type 'boolean
 183   :group 'mime-display)
 184
 185 (defcustom mm-enable-external t
 186   "Indicate whether external MIME handlers should be used.
 187
 188 If t, all defined external MIME handlers are used.  If nil, files are saved by
 189 `mailcap-save-binary-file'.  If it is the symbol `ask', you are prompted
 190 before the external MIME handler is invoked."
 191   :version "22.1"
 192   :type '(choice (const :tag "Always" t)
 193                  (const :tag "Never" nil)
 194                  (const :tag "Ask" ask))
 195   :group 'mime-display)
 196
 197 (defcustom mm-inline-media-tests
 198   '(("image/p?jpeg"
 199      mm-inline-image
 200      (lambda (handle)
 201        (mm-valid-and-fit-image-p 'jpeg handle)))
 202     ("image/png"
 203      mm-inline-image
 204      (lambda (handle)
 205        (mm-valid-and-fit-image-p 'png handle)))
 206     ("image/gif"
 207      mm-inline-image
 208      (lambda (handle)
 209        (mm-valid-and-fit-image-p 'gif handle)))
 210     ("image/tiff"
 211      mm-inline-image
 212      (lambda (handle)
 213        (mm-valid-and-fit-image-p 'tiff handle)))
 214     ("image/xbm"
 215      mm-inline-image
 216      (lambda (handle)
 217        (mm-valid-and-fit-image-p 'xbm handle)))
 218     ("image/x-xbitmap"
 219      mm-inline-image
 220      (lambda (handle)
 221        (mm-valid-and-fit-image-p 'xbm handle)))
 222     ("image/xpm"
 223      mm-inline-image
 224      (lambda (handle)
 225        (mm-valid-and-fit-image-p 'xpm handle)))
 226     ("image/x-xpixmap"
 227      mm-inline-image
 228      (lambda (handle)
 229        (mm-valid-and-fit-image-p 'xpm handle)))
 230     ("image/bmp"
 231      mm-inline-image
 232      (lambda (handle)
 233        (mm-valid-and-fit-image-p 'bmp handle)))
 234     ("image/x-portable-bitmap"
 235      mm-inline-image
 236      (lambda (handle)
 237        (mm-valid-and-fit-image-p 'pbm handle)))
 238     ("text/plain" mm-inline-text identity)
 239     ("text/enriched" mm-inline-text identity)
 240     ("text/richtext" mm-inline-text identity)
 241     ("text/x-patch" mm-display-patch-inline identity)
 242     ;; In case mime.types uses x-diff (as does Debian's mime-support-3.40).
 243     ("text/x-diff" mm-display-patch-inline identity)
 244     ("application/emacs-lisp" mm-display-elisp-inline identity)
 245     ("application/x-emacs-lisp" mm-display-elisp-inline identity)
 246     ("application/x-shellscript" mm-display-shell-script-inline identity)
 247     ("application/x-sh" mm-display-shell-script-inline identity)
 248     ("text/x-sh" mm-display-shell-script-inline identity)
 249     ("application/javascript" mm-display-javascript-inline identity)
 250     ("text/dns" mm-display-dns-inline identity)
 251     ("text/x-org" mm-display-org-inline identity)
 252     ("text/html"
 253      mm-inline-text-html
 254      (lambda (handle)
 255        mm-text-html-renderer))
 256     ("text/x-vcard"
 257      mm-inline-text-vcard
 258      (lambda (handle)
 259        (or (featurep 'vcard)
 260            (locate-library "vcard"))))
 261     ("message/delivery-status" mm-inline-text identity)
 262     ("message/rfc822" mm-inline-message identity)
 263     ("message/partial" mm-inline-partial identity)
 264     ("message/external-body" mm-inline-external-body identity)
 265     ("text/.*" mm-inline-text identity)
 266     ("application/x-.?tar\\(-.*\\)?" mm-archive-dissect-and-inline identity)
 267     ("application/zip" mm-archive-dissect-and-inline identity)
 268     ("audio/wav" mm-inline-audio
 269      (lambda (handle)
 270        (and (or (featurep 'nas-sound) (featurep 'native-sound))
 271             (device-sound-enabled-p))))
 272     ("audio/au"
 273      mm-inline-audio
 274      (lambda (handle)
 275        (and (or (featurep 'nas-sound) (featurep 'native-sound))
 276             (device-sound-enabled-p))))
 277     ("application/pgp-signature" ignore identity)
 278     ("application/x-pkcs7-signature" ignore identity)
 279     ("application/pkcs7-signature" ignore identity)
 280     ("application/x-pkcs7-mime" ignore identity)
 281     ("application/pkcs7-mime" ignore identity)
 282     ("multipart/alternative" ignore identity)
 283     ("multipart/mixed" ignore identity)
 284     ("multipart/related" ignore identity)
 285     ("image/.*"
 286      mm-inline-image
 287      (lambda (handle)
 288        (and (mm-valid-image-format-p 'imagemagick)
 289             (mm-with-unibyte-buffer
 290               (mm-insert-part handle)
 291               (let ((image
 292                      (ignore-errors
 293                        (if (fboundp 'create-image)
 294                            (create-image (buffer-string) 'imagemagick 'data-p)
 295                          (mm-create-image-xemacs
 296                           (mm-handle-media-subtype handle))))))
 297                 (when image
 298                   (setcar (cdr handle) (list "image/imagemagick"))
 299                   (mm-image-fit-p handle)))))))
 300     ;; Disable audio and image
 301     ("audio/.*" ignore ignore)
 302     ("image/.*" ignore ignore)
 303     ;; Default to displaying as text
 304     (".*" mm-inline-text mm-readable-p))
 305   "Alist of media types/tests saying whether types can be displayed inline."
 306   :type '(repeat (list (regexp :tag "MIME type")
 307                        (function :tag "Display function")
 308                        (function :tag "Display test")))
 309   :group 'mime-display)
 310
 311 (defcustom mm-inlined-types
 312   '("image/.*" "text/.*" "message/delivery-status" "message/rfc822"
 313     "message/partial" "message/external-body" "application/emacs-lisp"
 314     "application/x-emacs-lisp"
 315     "application/pgp-signature" "application/x-pkcs7-signature"
 316     "application/pkcs7-signature" "application/x-pkcs7-mime"
 317     "application/pkcs7-mime"
 318     "application/x-gtar-compressed"
 319     "application/x-tar"
 320     "application/zip"
 321     ;; Mutt still uses this even though it has already been withdrawn.
 322     "application/pgp")
 323   "List of media types that are to be displayed inline.
 324 See also `mm-inline-media-tests', which says how to display a media
 325 type inline."
 326   :type '(repeat regexp)
 327   :group 'mime-display)
 328
 329 (defcustom mm-keep-viewer-alive-types
 330   '("application/postscript" "application/msword" "application/vnd.ms-excel"
 331     "application/pdf" "application/x-dvi")
 332   "List of media types for which the external viewer will not be killed
 333 when selecting a different article."
 334   :version "22.1"
 335   :type '(repeat regexp)
 336   :group 'mime-display)
 337
 338 (defcustom mm-automatic-display
 339   '("text/plain" "text/enriched" "text/richtext" "text/html" "text/x-verbatim"
 340     "text/x-vcard" "image/.*" "message/delivery-status" "multipart/.*"
 341     "message/rfc822" "text/x-patch" "text/dns" "application/pgp-signature"
 342     "application/emacs-lisp" "application/x-emacs-lisp"
 343     "application/x-pkcs7-signature"
 344     "application/pkcs7-signature" "application/x-pkcs7-mime"
 345     "application/pkcs7-mime"
 346     ;; Mutt still uses this even though it has already been withdrawn.
 347     "application/pgp\\'"
 348      "text/x-org")
 349   "A list of MIME types to be displayed automatically."
 350   :type '(repeat regexp)
 351   :group 'mime-display)
 352
 353 (defcustom mm-attachment-override-types '("text/x-vcard"
 354                                           "application/pkcs7-mime"
 355                                           "application/x-pkcs7-mime"
 356                                           "application/pkcs7-signature"
 357                                           "application/x-pkcs7-signature")
 358   "Types to have \"attachment\" ignored if they can be displayed inline."
 359   :type '(repeat regexp)
 360   :group 'mime-display)
 361
 362 (defcustom mm-inline-override-types nil
 363   "Types to be treated as attachments even if they can be displayed inline."
 364   :type '(repeat regexp)
 365   :group 'mime-display)
 366
 367 (defcustom mm-automatic-external-display nil
 368   "List of MIME type regexps that will be displayed externally automatically."
 369   :type '(repeat regexp)
 370   :group 'mime-display)
 371
 372 (defcustom mm-discouraged-alternatives nil
 373   "List of MIME types that are discouraged when viewing multipart/alternative.
 374 Viewing agents are supposed to view the last possible part of a message,
 375 as that is supposed to be the richest.  However, users may prefer other
 376 types instead, and this list says what types are most unwanted.  If,
 377 for instance, text/html parts are very unwanted, and text/richtext are
 378 somewhat unwanted, then the value of this variable should be set
 379 to:
 380
 381  (\"text/html\" \"text/richtext\")
 382
 383 Adding \"image/.*\" might also be useful.  Spammers use it as the
 384 preferred part of multipart/alternative messages.  See also
 385 `gnus-buttonized-mime-types', to which adding \"multipart/alternative\"
 386 enables you to choose manually one of two types those mails include."
 387   :type '(repeat regexp) ;; See `mm-preferred-alternative-precedence'.
 388   :group 'mime-display)
 389
 390 (defcustom mm-tmp-directory
 391   (if (fboundp 'temp-directory)
 392       (temp-directory)
 393     (if (boundp 'temporary-file-directory)
 394         temporary-file-directory
 395       "/tmp/"))
 396   "Where mm will store its temporary files."
 397   :type 'directory
 398   :group 'mime-display)
 399
 400 (defcustom mm-inline-large-images nil
 401   "If t, then all images fit in the buffer.
 402 If 'resize, try to resize the images so they fit."
 403   :type '(radio
 404           (const :tag "Inline large images as they are." t)
 405           (const :tag "Resize large images." resize)
 406           (const :tag "Do not inline large images." nil))
 407   :group 'mime-display)
 408
 409 (defcustom mm-file-name-rewrite-functions
 410   '(mm-file-name-delete-control mm-file-name-delete-gotchas)
 411   "List of functions used for rewriting file names of MIME parts.
 412 Each function takes a file name as input and returns a file name.
 413
 414 Ready-made functions include `mm-file-name-delete-control',
 415 `mm-file-name-delete-gotchas' (you should not remove these two
 416 functions), `mm-file-name-delete-whitespace',
 417 `mm-file-name-trim-whitespace', `mm-file-name-collapse-whitespace',
 418 `mm-file-name-replace-whitespace', `capitalize', `downcase',
 419 `upcase', and `upcase-initials'."
 420   :type '(list (set :inline t
 421                     (const mm-file-name-delete-control)
 422                     (const mm-file-name-delete-gotchas)
 423                     (const mm-file-name-delete-whitespace)
 424                     (const mm-file-name-trim-whitespace)
 425                     (const mm-file-name-collapse-whitespace)
 426                     (const mm-file-name-replace-whitespace)
 427                     (const capitalize)
 428                     (const downcase)
 429                     (const upcase)
 430                     (const upcase-initials)
 431                (repeat :inline t
 432                        :tag "Function"
 433                        function)))
 434   :version "23.1" ;; No Gnus
 435   :group 'mime-display)
 436
 437
 438 (defvar mm-path-name-rewrite-functions nil
 439   "*List of functions for rewriting the full file names of MIME parts.
 440 This is used when viewing parts externally, and is meant for
 441 transforming the absolute name so that non-compliant programs can find
 442 the file where it's saved.
 443
 444 Each function takes a file name as input and returns a file name.")
 445
 446 (defvar mm-file-name-replace-whitespace nil
 447   "String used for replacing whitespace characters; default is `\"_\"'.")
 448
 449 (defcustom mm-default-directory nil
 450   "The default directory where mm will save files.
 451 If not set, `default-directory' will be used."
 452   :type '(choice directory (const :tag "Default" nil))
 453   :group 'mime-display)
 454
 455 (defcustom mm-attachment-file-modes 384
 456   "Set the mode bits of saved attachments to this integer."
 457   :version "22.1"
 458   :type 'integer
 459   :group 'mime-display)
 460
 461 (defcustom mm-external-terminal-program "xterm"
 462   "The program to start an external terminal."
 463   :version "22.1"
 464   :type 'string
 465   :group 'mime-display)
 466
 467 ;;; Internal variables.
 468
 469 (defvar mm-last-shell-command "")
 470 (defvar mm-content-id-alist nil)
 471 (defvar mm-postponed-undisplay-list nil)
 472 (defvar mm-inhibit-auto-detect-attachment nil)
 473
 474 ;; According to RFC2046, in particular, in a digest, the default
 475 ;; Content-Type value for a body part is changed from "text/plain" to
 476 ;; "message/rfc822".
 477 (defvar mm-dissect-default-type "text/plain")
 478
 479 (autoload 'mml2015-verify "mml2015")
 480 (autoload 'mml2015-verify-test "mml2015")
 481 (autoload 'mml-smime-verify "mml-smime")
 482 (autoload 'mml-smime-verify-test "mml-smime")
 483
 484 (defvar mm-verify-function-alist
 485   '(("application/pgp-signature" mml2015-verify "PGP" mml2015-verify-test)
 486     ("application/x-gnus-pgp-signature" mm-uu-pgp-signed-extract-1 "PGP"
 487      mm-uu-pgp-signed-test)
 488     ("application/pkcs7-signature" mml-smime-verify "S/MIME"
 489      mml-smime-verify-test)
 490     ("application/x-pkcs7-signature" mml-smime-verify "S/MIME"
 491      mml-smime-verify-test)))
 492
 493 (defcustom mm-verify-option 'never
 494   "Option of verifying signed parts.
 495 `never', not verify; `always', always verify;
 496 `known', only verify known protocols.  Otherwise, ask user.
 497
 498 When set to `always' or `known', you should add
 499 \"multipart/signed\" to `gnus-buttonized-mime-types' to see
 500 result of the verification."
 501   :version "22.1"
 502   :type '(choice (item always)
 503                  (item never)
 504                  (item :tag "only known protocols" known)
 505                  (item :tag "ask" nil))
 506   :group 'mime-security)
 507
 508 (autoload 'mml2015-decrypt "mml2015")
 509 (autoload 'mml2015-decrypt-test "mml2015")
 510
 511 (defvar mm-decrypt-function-alist
 512   '(("application/pgp-encrypted" mml2015-decrypt "PGP" mml2015-decrypt-test)
 513     ("application/x-gnus-pgp-encrypted" mm-uu-pgp-encrypted-extract-1 "PGP"
 514      mm-uu-pgp-encrypted-test)))
 515
 516 (defcustom mm-decrypt-option nil
 517   "Option of decrypting encrypted parts.
 518 `never', not decrypt; `always', always decrypt;
 519 `known', only decrypt known protocols.  Otherwise, ask user."
 520   :version "22.1"
 521   :type '(choice (item always)
 522                  (item never)
 523                  (item :tag "only known protocols" known)
 524                  (item :tag "ask" nil))
 525   :group 'mime-security)
 526
 527 (defvar mm-viewer-completion-map
 528   (let ((map (make-sparse-keymap 'mm-viewer-completion-map)))
 529     (set-keymap-parent map minibuffer-local-completion-map)
 530     ;; Should we bind other key to minibuffer-complete-word?
 531     (define-key map " " 'self-insert-command)
 532     map)
 533   "Keymap for input viewer with completion.")
 534
 535 (defvar mm-viewer-completion-map
 536   (let ((map (make-sparse-keymap 'mm-viewer-completion-map)))
 537     (set-keymap-parent map minibuffer-local-completion-map)
 538     ;; Should we bind other key to minibuffer-complete-word?
 539     (define-key map " " 'self-insert-command)
 540     map)
 541   "Keymap for input viewer with completion.")
 542
 543 ;;; The functions.
 544
 545 (defun mm-alist-to-plist (alist)
 546   "Convert association list ALIST into the equivalent property-list form.
 547 The plist is returned.  This converts from
 548
 549 \((a . 1) (b . 2) (c . 3))
 550
 551 into
 552
 553 \(a 1 b 2 c 3)
 554
 555 The original alist is not modified.  See also `destructive-alist-to-plist'."
 556   (let (plist)
 557     (while alist
 558       (let ((el (car alist)))
 559         (setq plist (cons (cdr el) (cons (car el) plist))))
 560       (setq alist (cdr alist)))
 561     (nreverse plist)))
 562
 563 (defun mm-keep-viewer-alive-p (handle)
 564   "Say whether external viewer for HANDLE should stay alive."
 565   (let ((types mm-keep-viewer-alive-types)
 566         (type (mm-handle-media-type handle))
 567         ty)
 568     (catch 'found
 569       (while (setq ty (pop types))
 570         (when (string-match ty type)
 571           (throw 'found t))))))
 572
 573 (defun mm-handle-set-external-undisplayer (handle function)
 574   "Set the undisplayer for HANDLE to FUNCTION.
 575 Postpone undisplaying of viewers for types in
 576 `mm-keep-viewer-alive-types'."
 577   (if (mm-keep-viewer-alive-p handle)
 578       (let ((new-handle (copy-sequence handle)))
 579         (mm-handle-set-undisplayer new-handle function)
 580         (mm-handle-set-undisplayer handle nil)
 581         (push new-handle mm-postponed-undisplay-list))
 582     (mm-handle-set-undisplayer handle function)))
 583
 584 (defun mm-destroy-postponed-undisplay-list ()
 585   (when mm-postponed-undisplay-list
 586     (message "Destroying external MIME viewers")
 587     (mm-destroy-parts mm-postponed-undisplay-list)))
 588
 589 (autoload 'message-fetch-field "message")
 590
 591 (defun mm-dissect-buffer (&optional no-strict-mime loose-mime from)
 592   "Dissect the current buffer and return a list of MIME handles.
 593 If NO-STRICT-MIME, don't require the message to have a
 594 MIME-Version header before proceeding."
 595   (save-excursion
 596     (let (ct ctl type subtype cte cd description id result)
 597       (save-restriction
 598         (mail-narrow-to-head)
 599         (when (or no-strict-mime
 600                   loose-mime
 601                   (mail-fetch-field "mime-version"))
 602           (setq ct (mail-fetch-field "content-type")
 603                 ctl (and ct (mail-header-parse-content-type ct))
 604                 cte (mail-fetch-field "content-transfer-encoding")
 605                 cd (or (mail-fetch-field "content-disposition")
 606                        (when (and ctl
 607                                   (eq 'mm-inline-text
 608                                       (cadr (mm-assoc-string-match
 609                                              mm-inline-media-tests
 610                                              (car ctl)))))
 611                          "inline"))
 612                 ;; Newlines in description should be stripped so as
 613                 ;; not to break the MIME tag into two or more lines.
 614                 description (message-fetch-field "content-description")
 615                 id (mail-fetch-field "content-id"))
 616           (unless from
 617             (setq from (mail-fetch-field "from")))
 618           ;; FIXME: In some circumstances, this code is running within
 619           ;; an unibyte macro.  mail-extract-address-components
 620           ;; creates unibyte buffers. This `if', though not a perfect
 621           ;; solution, avoids most of them.
 622           (if from
 623               (setq from (cadr (mail-extract-address-components from))))
 624           (if description
 625               (setq description (mail-decode-encoded-word-string
 626                                  description)))))
 627       (if (or (not ctl)
 628               (not (string-match "/" (car ctl))))
 629           (mm-dissect-singlepart
 630            (list mm-dissect-default-type)
 631            (and cte (intern (downcase (mail-header-strip cte))))
 632            no-strict-mime
 633            (and cd (mail-header-parse-content-disposition cd))
 634            description)
 635         (setq type (split-string (car ctl) "/"))
 636         (setq subtype (cadr type)
 637               type (car type))
 638         (setq
 639          result
 640          (cond
 641           ((equal type "multipart")
 642            (let ((mm-dissect-default-type (if (equal subtype "digest")
 643                                               "message/rfc822"
 644                                             "text/plain"))
 645                  (start (cdr (assq 'start (cdr ctl)))))
 646              (add-text-properties 0 (length (car ctl))
 647                                   (mm-alist-to-plist (cdr ctl)) (car ctl))
 648
 649              ;; what really needs to be done here is a way to link a
 650              ;; MIME handle back to it's parent MIME handle (in a multilevel
 651              ;; MIME article).  That would probably require changing
 652              ;; the mm-handle API so we simply store the multipart buffer
 653              ;; name as a text property of the "multipart/whatever" string.
 654              (add-text-properties 0 (length (car ctl))
 655                                   (list 'buffer (mm-copy-to-buffer)
 656                                         'from from
 657                                         'start start)
 658                                   (car ctl))
 659              (cons (car ctl) (mm-dissect-multipart ctl from))))
 660           (t
 661            (mm-possibly-verify-or-decrypt
 662             (mm-dissect-singlepart
 663              ctl
 664              (and cte (intern (downcase (mail-header-strip cte))))
 665              no-strict-mime
 666              (and cd (mail-header-parse-content-disposition cd))
 667              description id)
 668             ctl from))))
 669         (when id
 670           (when (string-match " *<\\(.*\\)> *" id)
 671             (setq id (match-string 1 id)))
 672           (push (cons id result) mm-content-id-alist))
 673         result))))
 674
 675 (defun mm-dissect-singlepart (ctl cte &optional force cdl description id)
 676   (when (or force
 677             (if (equal "text/plain" (car ctl))
 678                 (assoc 'format ctl)
 679               t))
 680     ;; Guess what the type of application/octet-stream parts should
 681     ;; really be.
 682     (let ((filename (cdr (assq 'filename (cdr cdl)))))
 683       (when (and (not mm-inhibit-auto-detect-attachment)
 684                  (equal (car ctl) "application/octet-stream")
 685                  filename
 686                  (string-match "\\.\\([^.]+\\)$" filename))
 687         (let ((new-type (mailcap-extension-to-mime (match-string 1 filename))))
 688           (when new-type
 689             (setcar ctl new-type)))))
 690     (let ((handle
 691            (mm-make-handle
 692             (mm-copy-to-buffer) ctl cte nil cdl description nil id))
 693           (decoder (assoc (car ctl) (mm-archive-decoders))))
 694       (if (and decoder
 695                ;; Do automatic decoding
 696                (cadr decoder)
 697                (executable-find (caddr decoder)))
 698           (mm-dissect-archive handle)
 699         handle))))
 700
 701 (defun mm-dissect-multipart (ctl from)
 702   (goto-char (point-min))
 703   (let* ((boundary (concat "\n--" (mail-content-type-get ctl 'boundary)))
 704          (close-delimiter (concat (regexp-quote boundary) "--[ \t]*$"))
 705          start parts
 706          (end (save-excursion
 707                 (goto-char (point-max))
 708                 (if (re-search-backward close-delimiter nil t)
 709                     (match-beginning 0)
 710                   (point-max))))
 711          (mm-inhibit-auto-detect-attachment
 712           (equal (car ctl) "multipart/encrypted")))
 713     (setq boundary (concat (regexp-quote boundary) "[ \t]*$"))
 714     (while (and (< (point) end) (re-search-forward boundary end t))
 715       (goto-char (match-beginning 0))
 716       (when start
 717         (save-excursion
 718           (save-restriction
 719             (narrow-to-region start (point))
 720             (setq parts (nconc (list (mm-dissect-buffer t nil from)) parts)))))
 721       (end-of-line 2)
 722       (or (looking-at boundary)
 723           (forward-line 1))
 724       (setq start (point)))
 725     (when (and start (< start end))
 726       (save-excursion
 727         (save-restriction
 728           (narrow-to-region start end)
 729           (setq parts (nconc (list (mm-dissect-buffer t nil from)) parts)))))
 730     (mm-possibly-verify-or-decrypt (nreverse parts) ctl from)))
 731
 732 (defun mm-copy-to-buffer ()
 733   "Copy the contents of the current buffer to a fresh buffer."
 734   (let ((obuf (current-buffer))
 735         (mb (mm-multibyte-p))
 736         beg)
 737     (goto-char (point-min))
 738     (search-forward-regexp "^\n" nil t)
 739     (setq beg (point))
 740     (with-current-buffer
 741           (generate-new-buffer " *mm*")
 742       ;; Preserve the data's unibyteness (for url-insert-file-contents).
 743       (mm-set-buffer-multibyte mb)
 744       (insert-buffer-substring obuf beg)
 745       (current-buffer))))
 746
 747 (defun mm-display-parts (handle &optional no-default)
 748   (if (stringp (car handle))
 749       (mapcar 'mm-display-parts (cdr handle))
 750     (if (bufferp (car handle))
 751         (save-restriction
 752           (narrow-to-region (point) (point))
 753           (mm-display-part handle)
 754           (goto-char (point-max)))
 755       (mapcar 'mm-display-parts handle))))
 756
 757 (autoload 'mailcap-parse-mailcaps "mailcap")
 758 (autoload 'mailcap-mime-info "mailcap")
 759
 760 (defun mm-display-part (handle &optional no-default force)
 761   "Display the MIME part represented by HANDLE.
 762 Returns nil if the part is removed; inline if displayed inline;
 763 external if displayed external."
 764   (save-excursion
 765     (mailcap-parse-mailcaps)
 766     (if (and (not force)
 767              (mm-handle-displayed-p handle))
 768         (mm-remove-part handle)
 769       (let* ((ehandle (if (equal (mm-handle-media-type handle)
 770                                  "message/external-body")
 771                           (progn
 772                             (unless (mm-handle-cache handle)
 773                               (mm-extern-cache-contents handle))
 774                             (mm-handle-cache handle))
 775                         handle))
 776              (type (mm-handle-media-type ehandle))
 777              (method (mailcap-mime-info type))
 778              (filename (or (mail-content-type-get
 779                             (mm-handle-disposition handle) 'filename)
 780                            (mail-content-type-get
 781                             (mm-handle-type handle) 'name)
 782                            "<file>"))
 783              (external mm-enable-external)
 784              (decoder (assoc (car (mm-handle-type handle))
 785                              (mm-archive-decoders))))
 786         (cond
 787          ((and decoder
 788                (executable-find (caddr decoder)))
 789           (mm-archive-dissect-and-inline handle)
 790           'inline)
 791          ((and (mm-inlinable-p ehandle)
 792                (mm-inlined-p ehandle))
 793           (forward-line 1)
 794           (mm-display-inline handle)
 795           'inline)
 796          ((or method
 797               (not no-default))
 798           (if (and (not method)
 799                    (equal "text" (car (split-string type "/"))))
 800               (progn
 801                 (forward-line 1)
 802                 (mm-insert-inline handle (mm-get-part handle))
 803                 'inline)
 804             (setq external
 805                   (and method         ;; If nil, we always use "save".
 806                        (stringp method) ;; 'mailcap-save-binary-file
 807                        (or (eq mm-enable-external t)
 808                            (and (eq mm-enable-external 'ask)
 809                                 (y-or-n-p
 810                                  (concat
 811                                   "Display part (" type
 812                                   ") using external program"
 813                                   ;; Can non-string method ever happen?
 814                                   (if (stringp method)
 815                                       (concat
 816                                        " \"" (format method filename) "\"")
 817                                     "")
 818                                   "? "))))))
 819             (if external
 820                 (mm-display-external
 821                  handle (or method 'mailcap-save-binary-file))
 822               (mm-display-external
 823                handle 'mailcap-save-binary-file)))))))))
 824
 825 (declare-function gnus-configure-windows "gnus-win" (setting &optional force))
 826 (defvar mailcap-mime-extensions)        ; mailcap-mime-info autoloads
 827 (declare-function term-mode "term" ())
 828 (declare-function term-char-mode "term" ())
 829
 830 (defun mm-display-external (handle method)
 831   "Display HANDLE using METHOD."
 832   (let ((outbuf (current-buffer)))
 833     (mm-with-unibyte-buffer
 834       (if (functionp method)
 835           (let ((cur (current-buffer)))
 836             (if (eq method 'mailcap-save-binary-file)
 837                 (progn
 838                   (set-buffer (generate-new-buffer " *mm*"))
 839                   (setq method nil))
 840               (mm-insert-part handle)
 841               (mm-add-meta-html-tag handle)
 842               (let ((win (get-buffer-window cur t)))
 843                 (when win
 844                   (select-window win)))
 845               (switch-to-buffer (generate-new-buffer " *mm*")))
 846             (buffer-disable-undo)
 847             (mm-set-buffer-file-coding-system mm-binary-coding-system)
 848             (insert-buffer-substring cur)
 849             (goto-char (point-min))
 850             (when method
 851               (message "Viewing with %s" method))
 852             (let ((mm (current-buffer))
 853                   (non-viewer (assq 'non-viewer
 854                                     (mailcap-mime-info
 855                                      (mm-handle-media-type handle) t))))
 856               (unwind-protect
 857                   (if method
 858                       (funcall method)
 859                     (mm-save-part handle))
 860                 (when (and (not non-viewer)
 861                            method)
 862                   (mm-handle-set-undisplayer handle mm)))))
 863         ;; The function is a string to be executed.
 864         (mm-insert-part handle)
 865         (mm-add-meta-html-tag handle)
 866         (let* ((dir (mm-make-temp-file
 867                      (expand-file-name "emm." mm-tmp-directory) 'dir))
 868                (filename (or
 869                           (mail-content-type-get
 870                            (mm-handle-disposition handle) 'filename)
 871                           (mail-content-type-get
 872                            (mm-handle-type handle) 'name)))
 873                (mime-info (mailcap-mime-info
 874                            (mm-handle-media-type handle) t))
 875                (needsterm (or (assoc "needsterm" mime-info)
 876                               (assoc "needsterminal" mime-info)))
 877                (copiousoutput (assoc "copiousoutput" mime-info))
 878                file buffer)
 879           ;; We create a private sub-directory where we store our files.
 880           (set-file-modes dir #o700)
 881           (if filename
 882               (setq file (expand-file-name
 883                           (gnus-map-function mm-file-name-rewrite-functions
 884                                              (file-name-nondirectory filename))
 885                           dir))
 886             ;; Use nametemplate (defined in RFC1524) if it is specified
 887             ;; in mailcap.
 888             (let ((suffix (cdr (assoc "nametemplate" mime-info))))
 889               (if (and suffix
 890                        (string-match "\\`%s\\(\\..+\\)\\'" suffix))
 891                   (setq suffix (match-string 1 suffix))
 892                 ;; Otherwise, use a suffix according to
 893                 ;; `mailcap-mime-extensions'.
 894                 (setq suffix (car (rassoc (mm-handle-media-type handle)
 895                                           mailcap-mime-extensions))))
 896               (setq file (mm-make-temp-file (expand-file-name "mm." dir)
 897                                             nil suffix))))
 898           (let ((coding-system-for-write mm-binary-coding-system))
 899             (write-region (point-min) (point-max) file nil 'nomesg))
 900           ;; The file is deleted after the viewer exists.  If the users edits
 901           ;; the file, changes will be lost.  Set file to read-only to make it
 902           ;; clear.
 903           (set-file-modes file #o400)
 904           (message "Viewing with %s" method)
 905           (cond
 906            (needsterm
 907             (let ((command (mm-mailcap-command
 908                             method file (mm-handle-type handle))))
 909               (unwind-protect
 910                   (if window-system
 911                       (start-process "*display*" nil
 912                                      mm-external-terminal-program
 913                                      "-e" shell-file-name
 914                                      shell-command-switch command)
 915                     (require 'term)
 916                     (require 'gnus-win)
 917                     (set-buffer
 918                      (setq buffer
 919                            (make-term "display"
 920                                       shell-file-name
 921                                       nil
 922                                       shell-command-switch command)))
 923                     (term-mode)
 924                     (term-char-mode)
 925                     (set-process-sentinel
 926                      (get-buffer-process buffer)
 927                      `(lambda (process state)
 928                         (if (eq 'exit (process-status process))
 929                             (gnus-configure-windows
 930                              ',gnus-current-window-configuration))))
 931                     (gnus-configure-windows 'display-term))
 932                 (mm-handle-set-external-undisplayer handle (cons file buffer)))
 933               (message "Displaying %s..." command))
 934             'external)
 935            (copiousoutput
 936             (with-current-buffer outbuf
 937               (forward-line 1)
 938               (mm-insert-inline
 939                handle
 940                (unwind-protect
 941                    (progn
 942                      (call-process shell-file-name nil
 943                                    (setq buffer
 944                                          (generate-new-buffer " *mm*"))
 945                                    nil
 946                                    shell-command-switch
 947                                    (mm-mailcap-command
 948                                     method file (mm-handle-type handle)))
 949                      (if (buffer-live-p buffer)
 950                          (with-current-buffer buffer
 951                            (buffer-string))))
 952                  (progn
 953                    (ignore-errors (delete-file file))
 954                    (ignore-errors (delete-directory
 955                                    (file-name-directory file)))
 956                    (ignore-errors (kill-buffer buffer))))))
 957             'inline)
 958            (t
 959             ;; Deleting the temp file should be postponed for some wrappers,
 960             ;; shell scripts, and so on, which might exit right after having
 961             ;; started a viewer command as a background job.
 962             (let ((command (mm-mailcap-command
 963                             method file (mm-handle-type handle))))
 964               (unwind-protect
 965                   (progn
 966                     (start-process "*display*"
 967                                    (setq buffer
 968                                          (generate-new-buffer " *mm*"))
 969                                    shell-file-name
 970                                    shell-command-switch command)
 971                     (set-process-sentinel
 972                      (get-buffer-process buffer)
 973                      (lexical-let ((outbuf outbuf)
 974                                    (file file)
 975                                    (buffer buffer)
 976                                    (command command)
 977                                    (handle handle))
 978                        (run-at-time
 979                         30.0 nil
 980                         (lambda ()
 981                           (ignore-errors
 982                             (delete-file file))
 983                           (ignore-errors
 984                             (delete-directory (file-name-directory file)))))
 985                        (lambda (process state)
 986                          (when (eq (process-status process) 'exit)
 987                            (condition-case nil
 988                                (delete-file file)
 989                              (error))
 990                            (condition-case nil
 991                                (delete-directory (file-name-directory file))
 992                              (error))
 993                            (when (buffer-live-p outbuf)
 994                              (with-current-buffer outbuf
 995                                (let ((buffer-read-only nil)
 996                                      (point (point)))
 997                                  (forward-line 2)
 998                                  (let ((start (point)))
 999                                    (mm-insert-inline
1000                                     handle (with-current-buffer buffer
1001                                              (buffer-string)))
1002                                    (put-text-property start (point)
1003                                                       'face 'mm-command-output))
1004                                  (goto-char point))))
1005                            (when (buffer-live-p buffer)
1006                              (kill-buffer buffer)))
1007                          (message "Displaying %s...done" command)))))
1008                 (mm-handle-set-external-undisplayer
1009                  handle (cons file buffer)))
1010               (message "Displaying %s..." command))
1011             'external)))))))
1012
1013 (defun mm-mailcap-command (method file type-list)
1014   (let ((ctl (cdr type-list))
1015         (beg 0)
1016         (uses-stdin t)
1017         out sub total)
1018     (while (string-match "%{\\([^}]+\\)}\\|'%s'\\|\"%s\"\\|%s\\|%t\\|%%"
1019                          method beg)
1020       (push (substring method beg (match-beginning 0)) out)
1021       (setq beg (match-end 0)
1022             total (match-string 0 method)
1023             sub (match-string 1 method))
1024       (cond
1025        ((string= total "%%")
1026         (push "%" out))
1027        ((or (string= total "%s")
1028             ;; We do our own quoting.
1029             (string= total "'%s'")
1030             (string= total "\"%s\""))
1031         (setq uses-stdin nil)
1032         (push (shell-quote-argument
1033                (gnus-map-function mm-path-name-rewrite-functions file)) out))
1034        ((string= total "%t")
1035         (push (shell-quote-argument (car type-list)) out))
1036        (t
1037         (push (shell-quote-argument (or (cdr (assq (intern sub) ctl)) "")) out))))
1038     (push (substring method beg (length method)) out)
1039     (when uses-stdin
1040       (push "<" out)
1041       (push (shell-quote-argument
1042              (gnus-map-function mm-path-name-rewrite-functions file))
1043             out))
1044     (mapconcat 'identity (nreverse out) "")))
1045
1046 (defun mm-remove-parts (handles)
1047   "Remove the displayed MIME parts represented by HANDLES."
1048   (if (and (listp handles)
1049            (bufferp (car handles)))
1050       (mm-remove-part handles)
1051     (let (handle)
1052       (while (setq handle (pop handles))
1053         (cond
1054          ((stringp handle)
1055           (when (buffer-live-p (get-text-property 0 'buffer handle))
1056             (kill-buffer (get-text-property 0 'buffer handle))))
1057          ((and (listp handle)
1058                (stringp (car handle)))
1059           (mm-remove-parts (cdr handle)))
1060          (t
1061           (mm-remove-part handle)))))))
1062
1063 (defun mm-destroy-parts (handles)
1064   "Remove the displayed MIME parts represented by HANDLES."
1065   (if (and (listp handles)
1066            (bufferp (car handles)))
1067       (mm-destroy-part handles)
1068     (let (handle)
1069       (while (setq handle (pop handles))
1070         (cond
1071          ((stringp handle)
1072           (when (buffer-live-p (get-text-property 0 'buffer handle))
1073             (kill-buffer (get-text-property 0 'buffer handle))))
1074          ((and (listp handle)
1075                (stringp (car handle)))
1076           (mm-destroy-parts handle))
1077          (t
1078           (mm-destroy-part handle)))))))
1079
1080 (defun mm-remove-part (handle)
1081   "Remove the displayed MIME part represented by HANDLE."
1082   (when (listp handle)
1083     (let ((object (mm-handle-undisplayer handle)))
1084       (ignore-errors
1085         (cond
1086          ;; Internally displayed part.
1087          ((mm-annotationp object)
1088           (if (featurep 'xemacs)
1089               (delete-annotation object)))
1090          ((or (functionp object)
1091               (and (listp object)
1092                    (eq (car object) 'lambda)))
1093           (funcall object))
1094          ;; Externally displayed part.
1095          ((consp object)
1096           (condition-case ()
1097               (while (get-buffer-process (cdr object))
1098                 (interrupt-process (get-buffer-process (cdr object)))
1099                 (message "Waiting for external displayer to die...")
1100                 (sit-for 1))
1101             (quit)
1102             (error))
1103           (ignore-errors (and (cdr object) (kill-buffer (cdr object))))
1104           (message "Waiting for external displayer to die...done")
1105           (ignore-errors (delete-file (car object)))
1106           (ignore-errors (delete-directory (file-name-directory
1107                                             (car object)))))
1108          ((bufferp object)
1109           (when (buffer-live-p object)
1110             (kill-buffer object)))))
1111       (mm-handle-set-undisplayer handle nil))))
1112
1113 (defun mm-display-inline (handle)
1114   (let* ((type (mm-handle-media-type handle))
1115          (function (cadr (mm-assoc-string-match mm-inline-media-tests type))))
1116     (funcall function handle)
1117     (goto-char (point-min))))
1118
1119 (defun mm-assoc-string-match (alist type)
1120   (dolist (elem alist)
1121     (when (string-match (car elem) type)
1122       (return elem))))
1123
1124 (defun mm-automatic-display-p (handle)
1125   "Say whether the user wants HANDLE to be displayed automatically."
1126   (let ((methods mm-automatic-display)
1127         (type (mm-handle-media-type handle))
1128         method result)
1129     (while (setq method (pop methods))
1130       (when (and (not (mm-inline-override-p handle))
1131                  (string-match method type))
1132         (setq result t
1133               methods nil)))
1134     result))
1135
1136 (defun mm-inlinable-p (handle &optional type)
1137   "Say whether HANDLE can be displayed inline.
1138 TYPE is the mime-type of the object; it defaults to the one given
1139 in HANDLE."
1140   (unless type (setq type (mm-handle-media-type handle)))
1141   (let ((alist mm-inline-media-tests)
1142         test)
1143     (while alist
1144       (when (string-match (caar alist) type)
1145         (setq test (caddar alist)
1146               alist nil)
1147         (setq test (funcall test handle)))
1148       (pop alist))
1149     test))
1150
1151 (defun mm-inlined-p (handle)
1152   "Say whether the user wants HANDLE to be displayed inline."
1153   (let ((methods mm-inlined-types)
1154         (type (mm-handle-media-type handle))
1155         method result)
1156     (while (setq method (pop methods))
1157       (when (and (not (mm-inline-override-p handle))
1158                  (string-match method type))
1159         (setq result t
1160               methods nil)))
1161     result))
1162
1163 (defun mm-attachment-override-p (handle)
1164   "Say whether HANDLE should have attachment behavior overridden."
1165   (let ((types mm-attachment-override-types)
1166         (type (mm-handle-media-type handle))
1167         ty)
1168     (catch 'found
1169       (while (setq ty (pop types))
1170         (when (and (string-match ty type)
1171                    (mm-inlinable-p handle))
1172           (throw 'found t))))))
1173
1174 (defun mm-inline-override-p (handle)
1175   "Say whether HANDLE should have inline behavior overridden."
1176   (let ((types mm-inline-override-types)
1177         (type (mm-handle-media-type handle))
1178         ty)
1179     (catch 'found
1180       (while (setq ty (pop types))
1181         (when (string-match ty type)
1182           (throw 'found t))))))
1183
1184 (defun mm-automatic-external-display-p (type)
1185   "Return the user-defined method for TYPE."
1186   (let ((methods mm-automatic-external-display)
1187         method result)
1188     (while (setq method (pop methods))
1189       (when (string-match method type)
1190         (setq result t
1191               methods nil)))
1192     result))
1193
1194 (defun mm-destroy-part (handle)
1195   "Destroy the data structures connected to HANDLE."
1196   (when (listp handle)
1197     (mm-remove-part handle)
1198     (when (buffer-live-p (mm-handle-buffer handle))
1199       (kill-buffer (mm-handle-buffer handle)))))
1200
1201 (defun mm-handle-displayed-p (handle)
1202   "Say whether HANDLE is displayed or not."
1203   (mm-handle-undisplayer handle))
1204
1205 ;;;
1206 ;;; Functions for outputting parts
1207 ;;;
1208
1209 (defmacro mm-with-part (handle &rest forms)
1210   "Run FORMS in the temp buffer containing the contents of HANDLE."
1211   ;; The handle-buffer's content is a sequence of bytes, not a sequence of
1212   ;; chars, so the buffer should be unibyte.  It may happen that the
1213   ;; handle-buffer is multibyte for some reason, in which case now is a good
1214   ;; time to adjust it, since we know at this point that it should
1215   ;; be unibyte.
1216   `(let* ((handle ,handle))
1217      (when (and (mm-handle-buffer handle)
1218                 (buffer-name (mm-handle-buffer handle)))
1219        (with-temp-buffer
1220          (mm-disable-multibyte)
1221          (insert-buffer-substring (mm-handle-buffer handle))
1222          (mm-decode-content-transfer-encoding
1223           (mm-handle-encoding handle)
1224           (mm-handle-media-type handle))
1225          ,@forms))))
1226 (put 'mm-with-part 'lisp-indent-function 1)
1227 (put 'mm-with-part 'edebug-form-spec '(body))
1228
1229 (defun mm-get-part (handle &optional no-cache)
1230   "Return the contents of HANDLE as a string.
1231 If NO-CACHE is non-nil, cached contents of a message/external-body part
1232 are ignored."
1233   (if (and (not no-cache)
1234            (equal (mm-handle-media-type handle) "message/external-body"))
1235       (progn
1236         (unless (mm-handle-cache handle)
1237           (mm-extern-cache-contents handle))
1238         (with-current-buffer (mm-handle-buffer (mm-handle-cache handle))
1239           (buffer-string)))
1240     (mm-with-part handle
1241       (buffer-string))))
1242
1243 (defun mm-insert-part (handle &optional no-cache)
1244   "Insert the contents of HANDLE in the current buffer.
1245 If NO-CACHE is non-nil, cached contents of a message/external-body part
1246 are ignored."
1247   (let ((text (cond ((eq (mail-content-type-get (mm-handle-type handle)
1248                                                 'charset)
1249                          'gnus-decoded)
1250                      (with-current-buffer (mm-handle-buffer handle)
1251                        (buffer-string)))
1252                     ((mm-multibyte-p)
1253                      (mm-string-to-multibyte (mm-get-part handle no-cache)))
1254                     (t
1255                      (mm-get-part handle no-cache)))))
1256     (save-restriction
1257       (widen)
1258       (goto-char
1259        (prog1
1260            (point)
1261          (if (and (eq (get-char-property (max (point-min) (1- (point))) 'face)
1262                       'mm-uu-extract)
1263                   (eq (get-char-property 0 'face text) 'mm-uu-extract))
1264              ;; Separate the extracted parts that have the same faces.
1265              (insert "\n" text)
1266            (insert text)))))))
1267
1268 (defun mm-file-name-delete-whitespace (file-name)
1269   "Remove all whitespace characters from FILE-NAME."
1270   (while (string-match "\\s-+" file-name)
1271     (setq file-name (replace-match "" t t file-name)))
1272   file-name)
1273
1274 (defun mm-file-name-trim-whitespace (file-name)
1275   "Remove leading and trailing whitespace characters from FILE-NAME."
1276   (when (string-match "\\`\\s-+" file-name)
1277     (setq file-name (substring file-name (match-end 0))))
1278   (when (string-match "\\s-+\\'" file-name)
1279     (setq file-name (substring file-name 0 (match-beginning 0))))
1280   file-name)
1281
1282 (defun mm-file-name-collapse-whitespace (file-name)
1283   "Collapse multiple whitespace characters in FILE-NAME."
1284   (while (string-match "\\s-\\s-+" file-name)
1285     (setq file-name (replace-match " " t t file-name)))
1286   file-name)
1287
1288 (defun mm-file-name-replace-whitespace (file-name)
1289   "Replace whitespace characters in FILE-NAME with underscores.
1290 Set the option `mm-file-name-replace-whitespace' to any other
1291 string if you do not like underscores."
1292   (let ((s (or mm-file-name-replace-whitespace "_")))
1293     (while (string-match "\\s-" file-name)
1294       (setq file-name (replace-match s t t file-name))))
1295   file-name)
1296
1297 (defun mm-file-name-delete-control (filename)
1298   "Delete control characters from FILENAME."
1299   (gnus-replace-in-string filename "[\x00-\x1f\x7f]" ""))
1300
1301 (defun mm-file-name-delete-gotchas (filename)
1302   "Delete shell gotchas from FILENAME."
1303   (setq filename (gnus-replace-in-string filename "[<>|]" ""))
1304   (gnus-replace-in-string filename "^[.-]+" ""))
1305
1306 (defun mm-save-part (handle &optional prompt)
1307   "Write HANDLE to a file.
1308 PROMPT overrides the default one used to ask user for a file name."
1309   (let ((filename (or (mail-content-type-get
1310                        (mm-handle-disposition handle) 'filename)
1311                       (mail-content-type-get
1312                        (mm-handle-type handle) 'name)))
1313         file)
1314     (when filename
1315       (setq filename (gnus-map-function mm-file-name-rewrite-functions
1316                                         (file-name-nondirectory filename))))
1317     (while
1318         (progn
1319           (setq file
1320                 (read-file-name
1321                  (or prompt
1322                      (format "Save MIME part to (default %s): "
1323                              (or filename "")))
1324                  (or mm-default-directory default-directory)
1325                  (expand-file-name (or filename "")
1326                                    (or mm-default-directory default-directory))))
1327           (cond ((or (not file) (equal file ""))
1328                  (message "Please enter a file name")
1329                  t)
1330                 ((and (file-directory-p file)
1331                       (not filename))
1332                  (message "Please enter a non-directory file name")
1333                  t)
1334                 (t nil)))
1335       (sit-for 2)
1336       (discard-input))
1337     (if (file-directory-p file)
1338         (setq file (expand-file-name filename file))
1339       (setq file (expand-file-name
1340                   file (or mm-default-directory default-directory))))
1341     (setq mm-default-directory (file-name-directory file))
1342     (and (or (not (file-exists-p file))
1343              (yes-or-no-p (format "File %s already exists; overwrite? "
1344                                   file)))
1345          (progn
1346            (mm-save-part-to-file handle file)
1347            file))))
1348
1349 (defun mm-add-meta-html-tag (handle &optional charset force-charset)
1350   "Add meta html tag to specify CHARSET of HANDLE in the current buffer.
1351 CHARSET defaults to the one HANDLE specifies.  Existing meta tag that
1352 specifies charset will not be modified unless FORCE-CHARSET is non-nil.
1353 Return t if meta tag is added or replaced."
1354   (when (equal (mm-handle-media-type handle) "text/html")
1355     (when (or charset
1356               (setq charset (mail-content-type-get (mm-handle-type handle)
1357                                                    'charset)))
1358       (setq charset (format "\
1359 <meta http-equiv=\"Content-Type\" content=\"text/html; charset=%s\">" charset))
1360       (let ((case-fold-search t))
1361         (goto-char (point-min))
1362         (if (re-search-forward "\
1363 <meta\\s-+http-equiv=[\"']?content-type[\"']?\\s-+content=[\"']\
1364 text/\\(\\sw+\\)\\(?:\;\\s-*charset=\\(.+\\)\\)?[\"'][^>]*>" nil t)
1365             (if (and (not force-charset)
1366                      (match-beginning 2)
1367                      (string-match "\\`html\\'" (match-string 1)))
1368                 ;; Don't modify existing meta tag.
1369                 nil
1370               ;; Replace it with the one specifying charset.
1371               (replace-match charset)
1372               t)
1373           (if (re-search-forward "<head>\\s-*" nil t)
1374               (insert charset "\n")
1375             (re-search-forward "<html\\(?:\\s-+[^>]+\\|\\s-*\\)>\\s-*" nil t)
1376             (insert "<head>\n" charset "\n</head>\n"))
1377           t)))))
1378
1379 (defun mm-save-part-to-file (handle file)
1380   (mm-with-unibyte-buffer
1381     (mm-insert-part handle)
1382     (mm-add-meta-html-tag handle)
1383     (let ((current-file-modes (default-file-modes)))
1384       (set-default-file-modes mm-attachment-file-modes)
1385       (unwind-protect
1386           ;; Don't re-compress .gz & al.  Arguably we should make
1387           ;; `file-name-handler-alist' nil, but that would chop
1388           ;; ange-ftp, which is reasonable to use here.
1389           (mm-write-region (point-min) (point-max) file nil nil nil 'binary t)
1390         (set-default-file-modes current-file-modes)))))
1391
1392 (defun mm-pipe-part (handle &optional cmd)
1393   "Pipe HANDLE to a process.
1394 Use CMD as the process."
1395   (let ((name (mail-content-type-get (mm-handle-type handle) 'name))
1396         (command (or cmd
1397                      (gnus-read-shell-command
1398                       "Shell command on MIME part: " mm-last-shell-command))))
1399     (mm-with-unibyte-buffer
1400       (mm-insert-part handle)
1401       (mm-add-meta-html-tag handle)
1402       (let ((coding-system-for-write 'binary))
1403         (shell-command-on-region (point-min) (point-max) command nil)))))
1404
1405 (autoload 'gnus-completing-read "gnus-util")
1406
1407 (defun mm-interactively-view-part (handle)
1408   "Display HANDLE using METHOD."
1409   (let* ((type (mm-handle-media-type handle))
1410          (methods
1411           (mapcar (lambda (i) (cdr (assoc 'viewer i)))
1412                   (mailcap-mime-info type 'all)))
1413          (method (let ((minibuffer-local-completion-map
1414                         mm-viewer-completion-map))
1415                    (completing-read "Viewer: " methods))))
1416     (when (string= method "")
1417       (error "No method given"))
1418     (if (string-match "^[^% \t]+$" method)
1419         (setq method (concat method " %s")))
1420     (mm-display-external handle method)))
1421
1422 (defun mm-preferred-alternative (handles &optional preferred)
1423   "Say which of HANDLES are preferred."
1424   (let ((prec (if preferred (list preferred)
1425                 (mm-preferred-alternative-precedence handles)))
1426         p h result type handle)
1427     (while (setq p (pop prec))
1428       (setq h handles)
1429       (while h
1430         (setq handle (car h))
1431         (setq type (mm-handle-media-type handle))
1432         (when (and (equal p type)
1433                    (mm-automatic-display-p handle)
1434                    (or (stringp (car handle))
1435                        (not (mm-handle-disposition handle))
1436                        (equal (car (mm-handle-disposition handle))
1437                               "inline")))
1438           (setq result handle
1439                 h nil
1440                 prec nil))
1441         (pop h)))
1442     result))
1443
1444 (defun mm-preferred-alternative-precedence (handles)
1445   "Return the precedence based on HANDLES and `mm-discouraged-alternatives'."
1446   (setq handles (reverse handles))
1447   (dolist (disc (reverse mm-discouraged-alternatives))
1448     (dolist (handle (copy-sequence handles))
1449       (when (string-match disc (mm-handle-media-type handle))
1450         (setq handles (nconc (delete handle handles) (list handle))))))
1451   ;; Remove empty parts.
1452   (dolist (handle (copy-sequence handles))
1453     (when (and (bufferp (mm-handle-buffer handle))
1454                (not (with-current-buffer (mm-handle-buffer handle)
1455                       (goto-char (point-min))
1456                       (re-search-forward "[^ \t\n]" nil t))))
1457       (setq handles (nconc (delete handle handles) (list handle)))))
1458   (mapcar #'mm-handle-media-type handles))
1459
1460 (defun mm-get-content-id (id)
1461   "Return the handle(s) referred to by ID."
1462   (cdr (assoc id mm-content-id-alist)))
1463
1464 (defconst mm-image-type-regexps
1465   '(("/\\*.*XPM.\\*/" . xpm)
1466     ("P[1-6]" . pbm)
1467     ("GIF8" . gif)
1468     ("\377\330" . jpeg)
1469     ("\211PNG\r\n" . png)
1470     ("#define" . xbm)
1471     ("\\(MM\0\\*\\)\\|\\(II\\*\0\\)" . tiff)
1472     ("%!PS" . postscript))
1473   "Alist of (REGEXP . IMAGE-TYPE) pairs used to auto-detect image types.
1474 When the first bytes of an image file match REGEXP, it is assumed to
1475 be of image type IMAGE-TYPE.")
1476
1477 ;; Steal from image.el. image-type-from-data suffers multi-line matching bug.
1478 (defun mm-image-type-from-buffer ()
1479   "Determine the image type from data in the current buffer.
1480 Value is a symbol specifying the image type or nil if type cannot
1481 be determined."
1482   (let ((types mm-image-type-regexps)
1483         type)
1484     (goto-char (point-min))
1485     (while (and types (null type))
1486       (let ((regexp (car (car types)))
1487             (image-type (cdr (car types))))
1488         (when (looking-at regexp)
1489           (setq type image-type))
1490         (setq types (cdr types))))
1491     type))
1492
1493 (defun mm-get-image (handle)
1494   "Return an image instance based on HANDLE."
1495   (let ((type (mm-handle-media-subtype handle))
1496         spec)
1497     ;; Allow some common translations.
1498     (setq type
1499           (cond
1500            ((equal type "x-pixmap")
1501             "xpm")
1502            ((equal type "x-xbitmap")
1503             "xbm")
1504            ((equal type "x-portable-bitmap")
1505             "pbm")
1506            (t type)))
1507     (or (mm-handle-cache handle)
1508         (mm-with-unibyte-buffer
1509           (mm-insert-part handle)
1510           (prog1
1511               (setq spec
1512                     (ignore-errors
1513                       ;; Avoid testing `make-glyph' since W3 may define
1514                       ;; a bogus version of it.
1515                       (if (fboundp 'create-image)
1516                           (create-image (buffer-string)
1517                                         (or (mm-image-type-from-buffer)
1518                                             (intern type))
1519                                         'data-p)
1520                         (mm-create-image-xemacs type))))
1521             (mm-handle-set-cache handle spec))))))
1522
1523 (defun mm-create-image-xemacs (type)
1524   (when (featurep 'xemacs)
1525     (cond
1526      ((equal type "xbm")
1527       ;; xbm images require special handling, since
1528       ;; the only way to create glyphs from these
1529       ;; (without a ton of work) is to write them
1530       ;; out to a file, and then create a file
1531       ;; specifier.
1532       (let ((file (mm-make-temp-file
1533                    (expand-file-name "emm" mm-tmp-directory)
1534                    nil ".xbm")))
1535         (unwind-protect
1536             (progn
1537               (write-region (point-min) (point-max) file)
1538               (make-glyph (list (cons 'x file))))
1539           (ignore-errors
1540             (delete-file file)))))
1541      (t
1542       (make-glyph
1543        (vector
1544         (or (mm-image-type-from-buffer)
1545             (intern type))
1546         :data (buffer-string)))))))
1547
1548 (declare-function image-size "image.c" (spec &optional pixels frame))
1549
1550 (defun mm-image-fit-p (handle)
1551   "Say whether the image in HANDLE will fit the current window."
1552   (let ((image (mm-get-image handle)))
1553     (or (not image)
1554         (if (featurep 'xemacs)
1555             ;; XEmacs's glyphs can actually tell us about their width, so
1556             ;; let's be nice and smart about them.
1557             (or mm-inline-large-images
1558                 (and (<= (glyph-width image) (window-pixel-width))
1559                      (<= (glyph-height image) (window-pixel-height))))
1560           (let* ((size (image-size image))
1561                  (w (car size))
1562                  (h (cdr size)))
1563             (or mm-inline-large-images
1564                 (and (<= h (1- (window-height))) ; Don't include mode line.
1565                      (<= w (window-width)))))))))
1566
1567 (defun mm-valid-image-format-p (format)
1568   "Say whether FORMAT can be displayed natively by Emacs."
1569   (cond
1570    ;; Handle XEmacs
1571    ((fboundp 'valid-image-instantiator-format-p)
1572     (valid-image-instantiator-format-p format))
1573    ;; Handle Emacs
1574    ((fboundp 'image-type-available-p)
1575     (and (display-graphic-p)
1576          (image-type-available-p format)))
1577    ;; Nobody else can do images yet.
1578    (t
1579     nil)))
1580
1581 (defun mm-valid-and-fit-image-p (format handle)
1582   "Say whether FORMAT can be displayed natively and HANDLE fits the window."
1583   (and (mm-valid-image-format-p format)
1584        (mm-image-fit-p handle)))
1585
1586 (defun mm-find-part-by-type (handles type &optional notp recursive)
1587   "Search in HANDLES for part with TYPE.
1588 If NOTP, returns first non-matching part.
1589 If RECURSIVE, search recursively."
1590   (let (handle)
1591     (while handles
1592       (if (and recursive (stringp (caar handles)))
1593           (if (setq handle (mm-find-part-by-type (cdar handles) type
1594                                                  notp recursive))
1595               (setq handles nil))
1596         (if (if notp
1597                 (not (equal (mm-handle-media-type (car handles)) type))
1598               (equal (mm-handle-media-type (car handles)) type))
1599             (setq handle (car handles)
1600                   handles nil)))
1601       (setq handles (cdr handles)))
1602     handle))
1603
1604 (defun mm-find-raw-part-by-type (ctl type &optional notp)
1605   (goto-char (point-min))
1606   (let* ((boundary (concat "--" (mm-handle-multipart-ctl-parameter ctl
1607                                                                    'boundary)))
1608          (close-delimiter (concat "^" (regexp-quote boundary) "--[ \t]*$"))
1609          start
1610          (end (save-excursion
1611                 (goto-char (point-max))
1612                 (if (re-search-backward close-delimiter nil t)
1613                     (match-beginning 0)
1614                   (point-max))))
1615          result)
1616     (setq boundary (concat "^" (regexp-quote boundary) "[ \t]*$"))
1617     (while (and (not result)
1618                 (re-search-forward boundary end t))
1619       (goto-char (match-beginning 0))
1620       (when start
1621         (save-excursion
1622           (save-restriction
1623             (narrow-to-region start (1- (point)))
1624             (when (let* ((ct (mail-fetch-field "content-type"))
1625                          (ctl (and ct (mail-header-parse-content-type ct))))
1626                     (if notp
1627                         (not (equal (car ctl) type))
1628                       (equal (car ctl) type)))
1629               (setq result (buffer-string))))))
1630       (forward-line 1)
1631       (setq start (point)))
1632     (when (and (not result) start)
1633       (save-excursion
1634         (save-restriction
1635           (narrow-to-region start end)
1636           (when (let* ((ct (mail-fetch-field "content-type"))
1637                        (ctl (and ct (mail-header-parse-content-type ct))))
1638                   (if notp
1639                       (not (equal (car ctl) type))
1640                     (equal (car ctl) type)))
1641             (setq result (buffer-string))))))
1642     result))
1643
1644 (defvar mm-security-handle nil)
1645
1646 (defsubst mm-set-handle-multipart-parameter (handle parameter value)
1647   ;; HANDLE could be a CTL.
1648   (when handle
1649     (put-text-property 0 (length (car handle)) parameter value
1650                        (car handle))))
1651
1652 (autoload 'mm-view-pkcs7 "mm-view")
1653
1654 (defun mm-possibly-verify-or-decrypt (parts ctl &optional from)
1655   (let ((type (car ctl))
1656         (subtype (cadr (split-string (car ctl) "/")))
1657         (mm-security-handle ctl) ;; (car CTL) is the type.
1658         protocol func functest)
1659     (cond
1660      ((or (equal type "application/x-pkcs7-mime")
1661           (equal type "application/pkcs7-mime"))
1662       (with-temp-buffer
1663         (when (and (cond
1664                     ((eq mm-decrypt-option 'never) nil)
1665                     ((eq mm-decrypt-option 'always) t)
1666                     ((eq mm-decrypt-option 'known) t)
1667                     (t (y-or-n-p
1668                         (format "Decrypt (S/MIME) part? "))))
1669                    (mm-view-pkcs7 parts from))
1670           (setq parts (mm-dissect-buffer t)))))
1671      ((equal subtype "signed")
1672       (unless (and (setq protocol
1673                          (mm-handle-multipart-ctl-parameter ctl 'protocol))
1674                    (not (equal protocol "multipart/mixed")))
1675         ;; The message is broken or draft-ietf-openpgp-multsig-01.
1676         (let ((protocols mm-verify-function-alist))
1677           (while protocols
1678             (if (and (or (not (setq functest (nth 3 (car protocols))))
1679                          (funcall functest parts ctl))
1680                      (mm-find-part-by-type parts (caar protocols) nil t))
1681                 (setq protocol (caar protocols)
1682                       protocols nil)
1683               (setq protocols (cdr protocols))))))
1684       (setq func (nth 1 (assoc protocol mm-verify-function-alist)))
1685       (when (cond
1686              ((eq mm-verify-option 'never) nil)
1687              ((eq mm-verify-option 'always) t)
1688              ((eq mm-verify-option 'known)
1689               (and func
1690                    (or (not (setq functest
1691                                   (nth 3 (assoc protocol
1692                                                 mm-verify-function-alist))))
1693                        (funcall functest parts ctl))))
1694              (t
1695               (y-or-n-p
1696                (format "Verify signed (%s) part? "
1697                        (or (nth 2 (assoc protocol mm-verify-function-alist))
1698                            (format "protocol=%s" protocol))))))
1699         (save-excursion
1700           (if func
1701               (setq parts (funcall func parts ctl))
1702             (mm-set-handle-multipart-parameter
1703              mm-security-handle 'gnus-details
1704              (format "Unknown sign protocol (%s)" protocol))))))
1705      ((equal subtype "encrypted")
1706       (unless (setq protocol
1707                     (mm-handle-multipart-ctl-parameter ctl 'protocol))
1708         ;; The message is broken.
1709         (let ((parts parts))
1710           (while parts
1711             (if (assoc (mm-handle-media-type (car parts))
1712                        mm-decrypt-function-alist)
1713                 (setq protocol (mm-handle-media-type (car parts))
1714                       parts nil)
1715               (setq parts (cdr parts))))))
1716       (setq func (nth 1 (assoc protocol mm-decrypt-function-alist)))
1717       (when (cond
1718              ((eq mm-decrypt-option 'never) nil)
1719              ((eq mm-decrypt-option 'always) t)
1720              ((eq mm-decrypt-option 'known)
1721               (and func
1722                    (or (not (setq functest
1723                                   (nth 3 (assoc protocol
1724                                                 mm-decrypt-function-alist))))
1725                        (funcall functest parts ctl))))
1726              (t
1727               (y-or-n-p
1728                (format "Decrypt (%s) part? "
1729                        (or (nth 2 (assoc protocol mm-decrypt-function-alist))
1730                            (format "protocol=%s" protocol))))))
1731         (save-excursion
1732           (if func
1733               (setq parts (funcall func parts ctl))
1734             (mm-set-handle-multipart-parameter
1735              mm-security-handle 'gnus-details
1736              (format "Unknown encrypt protocol (%s)" protocol))))))
1737      (t nil))
1738     parts))
1739
1740 (defun mm-multiple-handles (handles)
1741   (and (listp handles)
1742        (> (length handles) 1)
1743        (or (listp (car handles))
1744            (stringp (car handles)))))
1745
1746 (defun mm-complicated-handles (handles)
1747   (and (listp (car handles))
1748        (> (length handles) 1)))
1749
1750 (defun mm-merge-handles (handles1 handles2)
1751   (append
1752    (if (listp (car handles1))
1753        handles1
1754      (list handles1))
1755    (if (listp (car handles2))
1756        handles2
1757      (list handles2))))
1758
1759 (defun mm-readable-p (handle)
1760   "Say whether the content of HANDLE is readable."
1761   (and (< (with-current-buffer (mm-handle-buffer handle)
1762             (buffer-size)) 10000)
1763        (mm-with-unibyte-buffer
1764          (mm-insert-part handle)
1765          (and (eq (mm-body-7-or-8) '7bit)
1766               (not (mm-long-lines-p 76))))))
1767
1768 (declare-function libxml-parse-html-region "xml.c"
1769                   (start end &optional base-url))
1770 (declare-function shr-insert-document "shr" (dom))
1771 (defvar shr-blocked-images)
1772 (defvar gnus-inhibit-images)
1773 (autoload 'gnus-blocked-images "gnus-art")
1774
1775 (defun mm-shr (handle)
1776   ;; Require since we bind its variables.
1777   (require 'shr)
1778   (let ((article-buffer (current-buffer))
1779         (shr-content-function (lambda (id)
1780                                 (let ((handle (mm-get-content-id id)))
1781                                   (when handle
1782                                     (mm-with-part handle
1783                                       (buffer-string))))))
1784         shr-inhibit-images shr-blocked-images charset char)
1785     (if (and (boundp 'gnus-summary-buffer)
1786              (bufferp gnus-summary-buffer)
1787              (buffer-name gnus-summary-buffer))
1788         (with-current-buffer gnus-summary-buffer
1789           (setq shr-inhibit-images gnus-inhibit-images
1790                 shr-blocked-images (gnus-blocked-images)))
1791       (setq shr-inhibit-images gnus-inhibit-images
1792             shr-blocked-images (gnus-blocked-images)))
1793     (unless handle
1794       (setq handle (mm-dissect-buffer t)))
1795     (setq charset (mail-content-type-get (mm-handle-type handle) 'charset))
1796     (save-restriction
1797       (narrow-to-region (point) (point))
1798       (shr-insert-document
1799        (mm-with-part handle
1800          (insert (prog1
1801                      (if (and charset
1802                               (setq charset
1803                                     (mm-charset-to-coding-system charset
1804                                                                  nil t))
1805                               (not (eq charset 'ascii)))
1806                          (mm-decode-coding-string (buffer-string) charset)
1807                        (mm-string-as-multibyte (buffer-string)))
1808                    (erase-buffer)
1809                    (mm-enable-multibyte)))
1810          (goto-char (point-min))
1811          (setq case-fold-search t)
1812          (while (re-search-forward
1813                  "&#\\(?:x\\([89][0-9a-f]\\)\\|\\(1[2-5][0-9]\\)\\);" nil t)
1814            (when (setq char
1815                        (cdr (assq (if (match-beginning 1)
1816                                       (string-to-number (match-string 1) 16)
1817                                     (string-to-number (match-string 2)))
1818                                   mm-extra-numeric-entities)))
1819              (replace-match (char-to-string char))))
1820          ;; Remove "soft hyphens".
1821          (goto-char (point-min))
1822          (while (search-forward "" nil t)
1823            (replace-match "" t t))
1824          (libxml-parse-html-region (point-min) (point-max))))
1825       (unless (bobp)
1826         (insert "\n"))
1827       (mm-convert-shr-links)
1828       (mm-handle-set-undisplayer
1829        handle
1830        `(lambda ()
1831           (let ((inhibit-read-only t))
1832             (delete-region ,(point-min-marker)
1833                            ,(point-max-marker))))))))
1834
1835 (defvar shr-map)
1836
1837 (autoload 'widget-convert-button "wid-edit")
1838
1839 (defun mm-convert-shr-links ()
1840   (let ((start (point-min))
1841         end)
1842     (while (and start
1843                 (< start (point-max)))
1844       (when (setq start (text-property-not-all start (point-max) 'shr-url nil))
1845         (setq end (next-single-property-change start 'shr-url nil (point-max)))
1846         (widget-convert-button
1847          'url-link start end
1848          :help-echo (get-text-property start 'help-echo)
1849          :keymap shr-map
1850          (get-text-property start 'shr-url))
1851         (put-text-property start end 'local-map nil)
1852         (setq start end)))))
1853
1854 (defun mm-handle-filename (handle)
1855   "Return filename of HANDLE if any."
1856   (or (mail-content-type-get (mm-handle-type handle)
1857                              'name)
1858       (mail-content-type-get (mm-handle-disposition handle)
1859                              'filename)))
1860
1861 (provide 'mm-decode)
1862
1863 ;; Local Variables:
1864 ;; coding: utf-8
1865 ;; End:
1866
1867 ;;; mm-decode.el ends here