code.delx.au - gnu-emacs/blob - lisp/gnus/mml.el

   1 ;;; mml.el --- A package for parsing and validating MML documents
   2 ;; Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005
   3 ;;        Free Software Foundation, Inc.
   4
   5 ;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
   6 ;; This file is part of GNU Emacs.
   7
   8 ;; GNU Emacs is free software; you can redistribute it and/or modify
   9 ;; it under the terms of the GNU General Public License as published by
  10 ;; the Free Software Foundation; either version 2, or (at your option)
  11 ;; any later version.
  12
  13 ;; GNU Emacs is distributed in the hope that it will be useful,
  14 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 ;; GNU General Public License for more details.
  17
  18 ;; You should have received a copy of the GNU General Public License
  19 ;; along with GNU Emacs; see the file COPYING.  If not, write to the
  20 ;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  21 ;; Boston, MA 02110-1301, USA.
  22
  23 ;;; Commentary:
  24
  25 ;;; Code:
  26
  27 (require 'mm-util)
  28 (require 'mm-bodies)
  29 (require 'mm-encode)
  30 (require 'mm-decode)
  31 (require 'mml-sec)
  32 (eval-when-compile (require 'cl))
  33
  34 (eval-and-compile
  35   (autoload 'message-make-message-id "message")
  36   (autoload 'gnus-setup-posting-charset "gnus-msg")
  37   (autoload 'gnus-add-minor-mode "gnus-ems")
  38   (autoload 'gnus-make-local-hook "gnus-util")
  39   (autoload 'message-fetch-field "message")
  40   (autoload 'fill-flowed-encode "flow-fill")
  41   (autoload 'message-posting-charset "message"))
  42
  43 (defcustom mml-content-type-parameters
  44   '(name access-type expiration size permission format)
  45   "*A list of acceptable parameters in MML tag.
  46 These parameters are generated in Content-Type header if exists."
  47   :version "22.1"
  48   :type '(repeat (symbol :tag "Parameter"))
  49   :group 'message)
  50
  51 (defcustom mml-content-disposition-parameters
  52   '(filename creation-date modification-date read-date)
  53   "*A list of acceptable parameters in MML tag.
  54 These parameters are generated in Content-Disposition header if exists."
  55   :version "22.1"
  56   :type '(repeat (symbol :tag "Parameter"))
  57   :group 'message)
  58
  59 (defcustom mml-insert-mime-headers-always nil
  60   "If non-nil, always put Content-Type: text/plain at top of empty parts.
  61 It is necessary to work against a bug in certain clients."
  62   :version "22.1"
  63   :type 'boolean
  64   :group 'message)
  65
  66 (defvar mml-tweak-type-alist nil
  67   "A list of (TYPE . FUNCTION) for tweaking MML parts.
  68 TYPE is a string containing a regexp to match the MIME type.  FUNCTION
  69 is a Lisp function which is called with the MML handle to tweak the
  70 part.  This variable is used only when no TWEAK parameter exists in
  71 the MML handle.")
  72
  73 (defvar mml-tweak-function-alist nil
  74   "A list of (NAME . FUNCTION) for tweaking MML parts.
  75 NAME is a string containing the name of the TWEAK parameter in the MML
  76 handle.  FUNCTION is a Lisp function which is called with the MML
  77 handle to tweak the part.")
  78
  79 (defvar mml-tweak-sexp-alist
  80   '((mml-externalize-attachments . mml-tweak-externalize-attachments))
  81   "A list of (SEXP . FUNCTION) for tweaking MML parts.
  82 SEXP is an s-expression.  If the evaluation of SEXP is non-nil, FUNCTION
  83 is called.  FUNCTION is a Lisp function which is called with the MML
  84 handle to tweak the part.")
  85
  86 (defvar mml-externalize-attachments nil
  87   "*If non-nil, local-file attachments are generated as external parts.")
  88
  89 (defvar mml-generate-multipart-alist nil
  90   "*Alist of multipart generation functions.
  91 Each entry has the form (NAME . FUNCTION), where
  92 NAME is a string containing the name of the part (without the
  93 leading \"/multipart/\"),
  94 FUNCTION is a Lisp function which is called to generate the part.
  95
  96 The Lisp function has to supply the appropriate MIME headers and the
  97 contents of this part.")
  98
  99 (defvar mml-syntax-table
 100   (let ((table (copy-syntax-table emacs-lisp-mode-syntax-table)))
 101     (modify-syntax-entry ?\\ "/" table)
 102     (modify-syntax-entry ?< "(" table)
 103     (modify-syntax-entry ?> ")" table)
 104     (modify-syntax-entry ?@ "w" table)
 105     (modify-syntax-entry ?/ "w" table)
 106     (modify-syntax-entry ?= " " table)
 107     (modify-syntax-entry ?* " " table)
 108     (modify-syntax-entry ?\; " " table)
 109     (modify-syntax-entry ?\' " " table)
 110     table))
 111
 112 (defvar mml-boundary-function 'mml-make-boundary
 113   "A function called to suggest a boundary.
 114 The function may be called several times, and should try to make a new
 115 suggestion each time.  The function is called with one parameter,
 116 which is a number that says how many times the function has been
 117 called for this message.")
 118
 119 (defvar mml-confirmation-set nil
 120   "A list of symbols, each of which disables some warning.
 121 `unknown-encoding': always send messages contain characters with
 122 unknown encoding; `use-ascii': always use ASCII for those characters
 123 with unknown encoding; `multipart': always send messages with more than
 124 one charsets.")
 125
 126 (defvar mml-generate-default-type "text/plain"
 127   "Content type by which the Content-Type header can be omitted.
 128 The Content-Type header will not be put in the MIME part if the type
 129 equals the value and there's no parameter (e.g. charset, format, etc.)
 130 and `mml-insert-mime-headers-always' is nil.  The value will be bound
 131 to \"message/rfc822\" when encoding an article to be forwarded as a MIME
 132 part.  This is for the internal use, you should never modify the value.")
 133
 134 (defvar mml-buffer-list nil)
 135
 136 (defun mml-generate-new-buffer (name)
 137   (let ((buf (generate-new-buffer name)))
 138     (push buf mml-buffer-list)
 139     buf))
 140
 141 (defun mml-destroy-buffers ()
 142   (let (kill-buffer-hook)
 143     (mapcar 'kill-buffer mml-buffer-list)
 144     (setq mml-buffer-list nil)))
 145
 146 (defun mml-parse ()
 147   "Parse the current buffer as an MML document."
 148   (save-excursion
 149     (goto-char (point-min))
 150     (let ((table (syntax-table)))
 151       (unwind-protect
 152           (progn
 153             (set-syntax-table mml-syntax-table)
 154             (mml-parse-1))
 155         (set-syntax-table table)))))
 156
 157 (defun mml-parse-1 ()
 158   "Parse the current buffer as an MML document."
 159   (let (struct tag point contents charsets warn use-ascii no-markup-p raw)
 160     (while (and (not (eobp))
 161                 (not (looking-at "<#/multipart")))
 162       (cond
 163        ((looking-at "<#secure")
 164         ;; The secure part is essentially a meta-meta tag, which
 165         ;; expands to either a part tag if there are no other parts in
 166         ;; the document or a multipart tag if there are other parts
 167         ;; included in the message
 168         (let* (secure-mode
 169                (taginfo (mml-read-tag))
 170                (recipients (cdr (assq 'recipients taginfo)))
 171                (sender (cdr (assq 'sender taginfo)))
 172                (location (cdr (assq 'tag-location taginfo)))
 173                (mode (cdr (assq 'mode taginfo)))
 174                (method (cdr (assq 'method taginfo)))
 175                tags)
 176           (save-excursion
 177             (if
 178                 (re-search-forward
 179                  "<#\\(/\\)?\\(multipart\\|part\\|external\\|mml\\)." nil t)
 180                 (setq secure-mode "multipart")
 181               (setq secure-mode "part")))
 182           (save-excursion
 183             (goto-char location)
 184             (re-search-forward "<#secure[^\n]*>\n"))
 185           (delete-region (match-beginning 0) (match-end 0))
 186           (cond ((string= mode "sign")
 187                  (setq tags (list "sign" method)))
 188                 ((string= mode "encrypt")
 189                  (setq tags (list "encrypt" method)))
 190                 ((string= mode "signencrypt")
 191                  (setq tags (list "sign" method "encrypt" method))))
 192           (eval `(mml-insert-tag ,secure-mode
 193                                  ,@tags
 194                                  ,(if recipients "recipients")
 195                                  ,recipients
 196                                  ,(if sender "sender")
 197                                  ,sender))
 198           ;; restart the parse
 199           (goto-char location)))
 200        ((looking-at "<#multipart")
 201         (push (nconc (mml-read-tag) (mml-parse-1)) struct))
 202        ((looking-at "<#external")
 203         (push (nconc (mml-read-tag) (list (cons 'contents (mml-read-part))))
 204               struct))
 205        (t
 206         (if (or (looking-at "<#part") (looking-at "<#mml"))
 207             (setq tag (mml-read-tag)
 208                   no-markup-p nil
 209                   warn nil)
 210           (setq tag (list 'part '(type . "text/plain"))
 211                 no-markup-p t
 212                 warn t))
 213         (setq raw (cdr (assq 'raw tag))
 214               point (point)
 215               contents (mml-read-part (eq 'mml (car tag)))
 216               charsets (cond
 217                         (raw nil)
 218                         ((assq 'charset tag)
 219                          (list
 220                           (intern (downcase (cdr (assq 'charset tag))))))
 221                         (t
 222                          (mm-find-mime-charset-region point (point)
 223                                                       mm-hack-charsets))))
 224         (when (and (not raw) (memq nil charsets))
 225           (if (or (memq 'unknown-encoding mml-confirmation-set)
 226                   (message-options-get 'unknown-encoding)
 227                   (and (y-or-n-p "\
 228 Message contains characters with unknown encoding.  Really send? ")
 229                        (message-options-set 'unknown-encoding t)))
 230               (if (setq use-ascii
 231                         (or (memq 'use-ascii mml-confirmation-set)
 232                             (message-options-get 'use-ascii)
 233                             (and (y-or-n-p "Use ASCII as charset? ")
 234                                  (message-options-set 'use-ascii t))))
 235                   (setq charsets (delq nil charsets))
 236                 (setq warn nil))
 237             (error "Edit your message to remove those characters")))
 238         (if (or raw
 239                 (eq 'mml (car tag))
 240                 (< (length charsets) 2))
 241             (if (or (not no-markup-p)
 242                     (string-match "[^ \t\r\n]" contents))
 243                 ;; Don't create blank parts.
 244                 (push (nconc tag (list (cons 'contents contents)))
 245                       struct))
 246           (let ((nstruct (mml-parse-singlepart-with-multiple-charsets
 247                           tag point (point) use-ascii)))
 248             (when (and warn
 249                        (not (memq 'multipart mml-confirmation-set))
 250                        (not (message-options-get 'multipart))
 251                        (not (and (y-or-n-p (format "\
 252 A message part needs to be split into %d charset parts.  Really send? "
 253                                                    (length nstruct)))
 254                                  (message-options-set 'multipart t))))
 255               (error "Edit your message to use only one charset"))
 256             (setq struct (nconc nstruct struct)))))))
 257     (unless (eobp)
 258       (forward-line 1))
 259     (nreverse struct)))
 260
 261 (defun mml-parse-singlepart-with-multiple-charsets
 262   (orig-tag beg end &optional use-ascii)
 263   (save-excursion
 264     (save-restriction
 265       (narrow-to-region beg end)
 266       (goto-char (point-min))
 267       (let ((current (or (mm-mime-charset (mm-charset-after))
 268                          (and use-ascii 'us-ascii)))
 269             charset struct space newline paragraph)
 270         (while (not (eobp))
 271           (setq charset (mm-mime-charset (mm-charset-after)))
 272           (cond
 273            ;; The charset remains the same.
 274            ((eq charset 'us-ascii))
 275            ((or (and use-ascii (not charset))
 276                 (eq charset current))
 277             (setq space nil
 278                   newline nil
 279                   paragraph nil))
 280            ;; The initial charset was ascii.
 281            ((eq current 'us-ascii)
 282             (setq current charset
 283                   space nil
 284                   newline nil
 285                   paragraph nil))
 286            ;; We have a change in charsets.
 287            (t
 288             (push (append
 289                    orig-tag
 290                    (list (cons 'contents
 291                                (buffer-substring-no-properties
 292                                 beg (or paragraph newline space (point))))))
 293                   struct)
 294             (setq beg (or paragraph newline space (point))
 295                   current charset
 296                   space nil
 297                   newline nil
 298                   paragraph nil)))
 299           ;; Compute places where it might be nice to break the part.
 300           (cond
 301            ((memq (following-char) '(?  ?\t))
 302             (setq space (1+ (point))))
 303            ((and (eq (following-char) ?\n)
 304                  (not (bobp))
 305                  (eq (char-after (1- (point))) ?\n))
 306             (setq paragraph (point)))
 307            ((eq (following-char) ?\n)
 308             (setq newline (1+ (point)))))
 309           (forward-char 1))
 310         ;; Do the final part.
 311         (unless (= beg (point))
 312           (push (append orig-tag
 313                         (list (cons 'contents
 314                                     (buffer-substring-no-properties
 315                                      beg (point)))))
 316                 struct))
 317         struct))))
 318
 319 (defun mml-read-tag ()
 320   "Read a tag and return the contents."
 321   (let ((orig-point (point))
 322         contents name elem val)
 323     (forward-char 2)
 324     (setq name (buffer-substring-no-properties
 325                 (point) (progn (forward-sexp 1) (point))))
 326     (skip-chars-forward " \t\n")
 327     (while (not (looking-at ">[ \t]*\n?"))
 328       (setq elem (buffer-substring-no-properties
 329                   (point) (progn (forward-sexp 1) (point))))
 330       (skip-chars-forward "= \t\n")
 331       (setq val (buffer-substring-no-properties
 332                  (point) (progn (forward-sexp 1) (point))))
 333       (when (string-match "^\"\\(.*\\)\"$" val)
 334         (setq val (match-string 1 val)))
 335       (push (cons (intern elem) val) contents)
 336       (skip-chars-forward " \t\n"))
 337     (goto-char (match-end 0))
 338     ;; Don't skip the leading space.
 339     ;;(skip-chars-forward " \t\n")
 340     ;; Put the tag location into the returned contents
 341     (setq contents (append (list (cons 'tag-location orig-point)) contents))
 342     (cons (intern name) (nreverse contents))))
 343
 344 (defun mml-buffer-substring-no-properties-except-hard-newlines (start end)
 345   (let ((str (buffer-substring-no-properties start end))
 346         (bufstart start) tmp)
 347     (while (setq tmp (text-property-any start end 'hard 't))
 348       (set-text-properties (- tmp bufstart) (- tmp bufstart -1)
 349                            '(hard t) str)
 350       (setq start (1+ tmp)))
 351     str))
 352
 353 (defun mml-read-part (&optional mml)
 354   "Return the buffer up till the next part, multipart or closing part or multipart.
 355 If MML is non-nil, return the buffer up till the correspondent mml tag."
 356   (let ((beg (point)) (count 1))
 357     ;; If the tag ended at the end of the line, we go to the next line.
 358     (when (looking-at "[ \t]*\n")
 359       (forward-line 1))
 360     (if mml
 361         (progn
 362           (while (and (> count 0) (not (eobp)))
 363             (if (re-search-forward "<#\\(/\\)?mml." nil t)
 364                 (setq count (+ count (if (match-beginning 1) -1 1)))
 365               (goto-char (point-max))))
 366           (mml-buffer-substring-no-properties-except-hard-newlines
 367            beg (if (> count 0)
 368                    (point)
 369                  (match-beginning 0))))
 370       (if (re-search-forward
 371            "<#\\(/\\)?\\(multipart\\|part\\|external\\|mml\\)." nil t)
 372           (prog1
 373               (mml-buffer-substring-no-properties-except-hard-newlines
 374                beg (match-beginning 0))
 375             (if (or (not (match-beginning 1))
 376                     (equal (match-string 2) "multipart"))
 377                 (goto-char (match-beginning 0))
 378               (when (looking-at "[ \t]*\n")
 379                 (forward-line 1))))
 380         (mml-buffer-substring-no-properties-except-hard-newlines
 381          beg (goto-char (point-max)))))))
 382
 383 (defvar mml-boundary nil)
 384 (defvar mml-base-boundary "-=-=")
 385 (defvar mml-multipart-number 0)
 386
 387 (defun mml-generate-mime ()
 388   "Generate a MIME message based on the current MML document."
 389   (let ((cont (mml-parse))
 390         (mml-multipart-number mml-multipart-number))
 391     (if (not cont)
 392         nil
 393       (with-temp-buffer
 394         (if (and (consp (car cont))
 395                  (= (length cont) 1))
 396             (mml-generate-mime-1 (car cont))
 397           (mml-generate-mime-1 (nconc (list 'multipart '(type . "mixed"))
 398                                       cont)))
 399         (buffer-string)))))
 400
 401 (defun mml-generate-mime-1 (cont)
 402   (let ((mm-use-ultra-safe-encoding
 403          (or mm-use-ultra-safe-encoding (assq 'sign cont))))
 404     (save-restriction
 405       (narrow-to-region (point) (point))
 406       (mml-tweak-part cont)
 407       (cond
 408        ((or (eq (car cont) 'part) (eq (car cont) 'mml))
 409         (let* ((raw (cdr (assq 'raw cont)))
 410                (filename (cdr (assq 'filename cont)))
 411                (type (or (cdr (assq 'type cont))
 412                          (if filename
 413                              (or (mm-default-file-encoding filename)
 414                                  "application/octet-stream")
 415                            "text/plain")))
 416                coded encoding charset flowed)
 417           (if (and (not raw)
 418                    (member (car (split-string type "/")) '("text" "message")))
 419               (progn
 420                 (with-temp-buffer
 421                   (setq charset (mm-charset-to-coding-system
 422                                  (cdr (assq 'charset cont))))
 423                   (when (eq charset 'ascii)
 424                     (setq charset nil))
 425                   (cond
 426                    ((cdr (assq 'buffer cont))
 427                     (insert-buffer-substring (cdr (assq 'buffer cont))))
 428                    ((and filename
 429                          (not (equal (cdr (assq 'nofile cont)) "yes")))
 430                     (let ((coding-system-for-read charset))
 431                       (mm-insert-file-contents filename)))
 432                    ((eq 'mml (car cont))
 433                     (insert (cdr (assq 'contents cont))))
 434                    (t
 435                     (save-restriction
 436                       (narrow-to-region (point) (point))
 437                       (insert (cdr (assq 'contents cont)))
 438                       ;; Remove quotes from quoted tags.
 439                       (goto-char (point-min))
 440                       (while (re-search-forward
 441                               "<#!+/?\\(part\\|multipart\\|external\\|mml\\)"
 442                               nil t)
 443                         (delete-region (+ (match-beginning 0) 2)
 444                                        (+ (match-beginning 0) 3))))))
 445                   (cond
 446                    ((eq (car cont) 'mml)
 447                     (let ((mml-boundary (mml-compute-boundary cont))
 448                           ;; It is necessary for the case where this
 449                           ;; function is called recursively since
 450                           ;; `m-g-d-t' will be bound to "message/rfc822"
 451                           ;; when encoding an article to be forwarded.
 452                           (mml-generate-default-type "text/plain"))
 453                       (mml-to-mime))
 454                     (let ((mm-7bit-chars (concat mm-7bit-chars "\x1b")))
 455                       ;; ignore 0x1b, it is part of iso-2022-jp
 456                       (setq encoding (mm-body-7-or-8))))
 457                    ((string= (car (split-string type "/")) "message")
 458                     (let ((mm-7bit-chars (concat mm-7bit-chars "\x1b")))
 459                       ;; ignore 0x1b, it is part of iso-2022-jp
 460                       (setq encoding (mm-body-7-or-8))))
 461                    (t
 462                     ;; Only perform format=flowed filling on text/plain
 463                     ;; parts where there either isn't a format parameter
 464                     ;; in the mml tag or it says "flowed" and there
 465                     ;; actually are hard newlines in the text.
 466                     (let (use-hard-newlines)
 467                       (when (and (string= type "text/plain")
 468                                  (not (string= (cdr (assq 'sign cont)) "pgp"))
 469                                  (or (null (assq 'format cont))
 470                                      (string= (cdr (assq 'format cont))
 471                                               "flowed"))
 472                                  (setq use-hard-newlines
 473                                        (text-property-any
 474                                         (point-min) (point-max) 'hard 't)))
 475                         (fill-flowed-encode)
 476                         ;; Indicate that `mml-insert-mime-headers' should
 477                         ;; insert a "; format=flowed" string unless the
 478                         ;; user has already specified it.
 479                         (setq flowed (null (assq 'format cont)))))
 480                     (setq charset (mm-encode-body charset))
 481                     (setq encoding (mm-body-encoding
 482                                     charset (cdr (assq 'encoding cont))))))
 483                   (setq coded (buffer-string)))
 484                 (mml-insert-mime-headers cont type charset encoding flowed)
 485                 (insert "\n")
 486                 (insert coded))
 487             (mm-with-unibyte-buffer
 488               (cond
 489                ((cdr (assq 'buffer cont))
 490                 (insert (with-current-buffer (cdr (assq 'buffer cont))
 491                           (mm-with-unibyte-current-buffer
 492                             (buffer-string)))))
 493                ((and filename
 494                      (not (equal (cdr (assq 'nofile cont)) "yes")))
 495                 (let ((coding-system-for-read mm-binary-coding-system))
 496                   (mm-insert-file-contents filename nil nil nil nil t)))
 497                (t
 498                 (insert (cdr (assq 'contents cont)))))
 499               (setq encoding (mm-encode-buffer type)
 500                     coded (mm-string-as-multibyte (buffer-string))))
 501             (mml-insert-mime-headers cont type charset encoding nil)
 502             (insert "\n")
 503             (mm-with-unibyte-current-buffer
 504               (insert coded)))))
 505        ((eq (car cont) 'external)
 506         (insert "Content-Type: message/external-body")
 507         (let ((parameters (mml-parameter-string
 508                            cont '(expiration size permission)))
 509               (name (cdr (assq 'name cont)))
 510               (url (cdr (assq 'url cont))))
 511           (when name
 512             (setq name (mml-parse-file-name name))
 513             (if (stringp name)
 514                 (mml-insert-parameter
 515                  (mail-header-encode-parameter "name" name)
 516                  "access-type=local-file")
 517               (mml-insert-parameter
 518                (mail-header-encode-parameter
 519                 "name" (file-name-nondirectory (nth 2 name)))
 520                (mail-header-encode-parameter "site" (nth 1 name))
 521                (mail-header-encode-parameter
 522                 "directory" (file-name-directory (nth 2 name))))
 523               (mml-insert-parameter
 524                (concat "access-type="
 525                        (if (member (nth 0 name) '("ftp@" "anonymous@"))
 526                            "anon-ftp"
 527                          "ftp")))))
 528           (when url
 529             (mml-insert-parameter
 530              (mail-header-encode-parameter "url" url)
 531              "access-type=url"))
 532           (when parameters
 533             (mml-insert-parameter-string
 534              cont '(expiration size permission)))
 535           (insert "\n\n")
 536           (insert "Content-Type: "
 537                   (or (cdr (assq 'type cont))
 538                       (if name
 539                           (or (mm-default-file-encoding name)
 540                               "application/octet-stream")
 541                         "text/plain"))
 542                   "\n")
 543           (insert "Content-ID: " (message-make-message-id) "\n")
 544           (insert "Content-Transfer-Encoding: "
 545                   (or (cdr (assq 'encoding cont)) "binary"))
 546           (insert "\n\n")
 547           (insert (or (cdr (assq 'contents cont))))
 548           (insert "\n")))
 549        ((eq (car cont) 'multipart)
 550         (let* ((type (or (cdr (assq 'type cont)) "mixed"))
 551                (mml-generate-default-type (if (equal type "digest")
 552                                               "message/rfc822"
 553                                             "text/plain"))
 554                (handler (assoc type mml-generate-multipart-alist)))
 555           (if handler
 556               (funcall (cdr handler) cont)
 557             ;; No specific handler.  Use default one.
 558             (let ((mml-boundary (mml-compute-boundary cont)))
 559               (insert (format "Content-Type: multipart/%s; boundary=\"%s\""
 560                               type mml-boundary)
 561                       (if (cdr (assq 'start cont))
 562                           (format "; start=\"%s\"\n" (cdr (assq 'start cont)))
 563                         "\n"))
 564               (let ((cont cont) part)
 565                 (while (setq part (pop cont))
 566                   ;; Skip `multipart' and attributes.
 567                   (when (and (consp part) (consp (cdr part)))
 568                     (insert "\n--" mml-boundary "\n")
 569                     (mml-generate-mime-1 part))))
 570               (insert "\n--" mml-boundary "--\n")))))
 571        (t
 572         (error "Invalid element: %S" cont)))
 573       ;; handle sign & encrypt tags in a semi-smart way.
 574       (let ((sign-item (assoc (cdr (assq 'sign cont)) mml-sign-alist))
 575             (encrypt-item (assoc (cdr (assq 'encrypt cont))
 576                                  mml-encrypt-alist))
 577             sender recipients)
 578         (when (or sign-item encrypt-item)
 579           (when (setq sender (cdr (assq 'sender cont)))
 580             (message-options-set 'mml-sender sender)
 581             (message-options-set 'message-sender sender))
 582           (if (setq recipients (cdr (assq 'recipients cont)))
 583               (message-options-set 'message-recipients recipients))
 584           (let ((style (mml-signencrypt-style
 585                         (first (or sign-item encrypt-item)))))
 586             ;; check if: we're both signing & encrypting, both methods
 587             ;; are the same (why would they be different?!), and that
 588             ;; the signencrypt style allows for combined operation.
 589             (if (and sign-item encrypt-item (equal (first sign-item)
 590                                                    (first encrypt-item))
 591                      (equal style 'combined))
 592                 (funcall (nth 1 encrypt-item) cont t)
 593               ;; otherwise, revert to the old behavior.
 594               (when sign-item
 595                 (funcall (nth 1 sign-item) cont))
 596               (when encrypt-item
 597                 (funcall (nth 1 encrypt-item) cont)))))))))
 598
 599 (defun mml-compute-boundary (cont)
 600   "Return a unique boundary that does not exist in CONT."
 601   (let ((mml-boundary (funcall mml-boundary-function
 602                                (incf mml-multipart-number))))
 603     ;; This function tries again and again until it has found
 604     ;; a unique boundary.
 605     (while (not (catch 'not-unique
 606                   (mml-compute-boundary-1 cont))))
 607     mml-boundary))
 608
 609 (defun mml-compute-boundary-1 (cont)
 610   (let (filename)
 611     (cond
 612      ((eq (car cont) 'part)
 613       (with-temp-buffer
 614         (cond
 615          ((cdr (assq 'buffer cont))
 616           (insert-buffer-substring (cdr (assq 'buffer cont))))
 617          ((and (setq filename (cdr (assq 'filename cont)))
 618                (not (equal (cdr (assq 'nofile cont)) "yes")))
 619           (mm-insert-file-contents filename nil nil nil nil t))
 620          (t
 621           (insert (cdr (assq 'contents cont)))))
 622         (goto-char (point-min))
 623         (when (re-search-forward (concat "^--" (regexp-quote mml-boundary))
 624                                  nil t)
 625           (setq mml-boundary (funcall mml-boundary-function
 626                                       (incf mml-multipart-number)))
 627           (throw 'not-unique nil))))
 628      ((eq (car cont) 'multipart)
 629       (mapcar 'mml-compute-boundary-1 (cddr cont))))
 630     t))
 631
 632 (defun mml-make-boundary (number)
 633   (concat (make-string (% number 60) ?=)
 634           (if (> number 17)
 635               (format "%x" number)
 636             "")
 637           mml-base-boundary))
 638
 639 (defun mml-insert-mime-headers (cont type charset encoding flowed)
 640   (let (parameters id disposition description)
 641     (setq parameters
 642           (mml-parameter-string
 643            cont mml-content-type-parameters))
 644     (when (or charset
 645               parameters
 646               flowed
 647               (not (equal type mml-generate-default-type))
 648               mml-insert-mime-headers-always)
 649       (when (consp charset)
 650         (error
 651          "Can't encode a part with several charsets"))
 652       (insert "Content-Type: " type)
 653       (when charset
 654         (insert "; " (mail-header-encode-parameter
 655                       "charset" (symbol-name charset))))
 656       (when flowed
 657         (insert "; format=flowed"))
 658       (when parameters
 659         (mml-insert-parameter-string
 660          cont mml-content-type-parameters))
 661       (insert "\n"))
 662     (when (setq id (cdr (assq 'id cont)))
 663       (insert "Content-ID: " id "\n"))
 664     (setq parameters
 665           (mml-parameter-string
 666            cont mml-content-disposition-parameters))
 667     (when (or (setq disposition (cdr (assq 'disposition cont)))
 668               parameters)
 669       (insert "Content-Disposition: " (or disposition "inline"))
 670       (when parameters
 671         (mml-insert-parameter-string
 672          cont mml-content-disposition-parameters))
 673       (insert "\n"))
 674     (unless (eq encoding '7bit)
 675       (insert (format "Content-Transfer-Encoding: %s\n" encoding)))
 676     (when (setq description (cdr (assq 'description cont)))
 677       (insert "Content-Description: "
 678               (mail-encode-encoded-word-string description) "\n"))))
 679
 680 (defun mml-parameter-string (cont types)
 681   (let ((string "")
 682         value type)
 683     (while (setq type (pop types))
 684       (when (setq value (cdr (assq type cont)))
 685         ;; Strip directory component from the filename parameter.
 686         (when (eq type 'filename)
 687           (setq value (file-name-nondirectory value)))
 688         (setq string (concat string "; "
 689                              (mail-header-encode-parameter
 690                               (symbol-name type) value)))))
 691     (when (not (zerop (length string)))
 692       string)))
 693
 694 (defun mml-insert-parameter-string (cont types)
 695   (let (value type)
 696     (while (setq type (pop types))
 697       (when (setq value (cdr (assq type cont)))
 698         ;; Strip directory component from the filename parameter.
 699         (when (eq type 'filename)
 700           (setq value (file-name-nondirectory value)))
 701         (mml-insert-parameter
 702          (mail-header-encode-parameter
 703           (symbol-name type) value))))))
 704
 705 (eval-when-compile
 706   (defvar ange-ftp-name-format)
 707   (defvar efs-path-regexp))
 708 (defun mml-parse-file-name (path)
 709   (if (if (boundp 'efs-path-regexp)
 710           (string-match efs-path-regexp path)
 711         (if (boundp 'ange-ftp-name-format)
 712             (string-match (car ange-ftp-name-format) path)))
 713       (list (match-string 1 path) (match-string 2 path)
 714             (substring path (1+ (match-end 2))))
 715     path))
 716
 717 (defun mml-insert-buffer (buffer)
 718   "Insert BUFFER at point and quote any MML markup."
 719   (save-restriction
 720     (narrow-to-region (point) (point))
 721     (insert-buffer-substring buffer)
 722     (mml-quote-region (point-min) (point-max))
 723     (goto-char (point-max))))
 724
 725 ;;;
 726 ;;; Transforming MIME to MML
 727 ;;;
 728
 729 (defun mime-to-mml (&optional handles)
 730   "Translate the current buffer (which should be a message) into MML.
 731 If HANDLES is non-nil, use it instead reparsing the buffer."
 732   ;; First decode the head.
 733   (save-restriction
 734     (message-narrow-to-head)
 735     (let ((rfc2047-quote-decoded-words-containing-tspecials t))
 736       (mail-decode-encoded-word-region (point-min) (point-max))))
 737   (unless handles
 738     (setq handles (mm-dissect-buffer t)))
 739   (goto-char (point-min))
 740   (search-forward "\n\n" nil t)
 741   (delete-region (point) (point-max))
 742   (if (stringp (car handles))
 743       (mml-insert-mime handles)
 744     (mml-insert-mime handles t))
 745   (mm-destroy-parts handles)
 746   (save-restriction
 747     (message-narrow-to-head)
 748     ;; Remove them, they are confusing.
 749     (message-remove-header "Content-Type")
 750     (message-remove-header "MIME-Version")
 751     (message-remove-header "Content-Disposition")
 752     (message-remove-header "Content-Transfer-Encoding")))
 753
 754 (defun mml-to-mime ()
 755   "Translate the current buffer from MML to MIME."
 756   (message-encode-message-body)
 757   (save-restriction
 758     (message-narrow-to-headers-or-head)
 759     ;; Skip past any From_ headers.
 760     (while (looking-at "From ")
 761       (forward-line 1))
 762     (let ((mail-parse-charset message-default-charset))
 763       (mail-encode-encoded-word-buffer))))
 764
 765 (defun mml-insert-mime (handle &optional no-markup)
 766   (let (textp buffer mmlp)
 767     ;; Determine type and stuff.
 768     (unless (stringp (car handle))
 769       (unless (setq textp (equal (mm-handle-media-supertype handle) "text"))
 770         (save-excursion
 771           (set-buffer (setq buffer (mml-generate-new-buffer " *mml*")))
 772           (mm-insert-part handle)
 773           (if (setq mmlp (equal (mm-handle-media-type handle)
 774                                 "message/rfc822"))
 775               (mime-to-mml)))))
 776     (if mmlp
 777         (mml-insert-mml-markup handle nil t t)
 778       (unless (and no-markup
 779                    (equal (mm-handle-media-type handle) "text/plain"))
 780         (mml-insert-mml-markup handle buffer textp)))
 781     (cond
 782      (mmlp
 783       (insert-buffer-substring buffer)
 784       (goto-char (point-max))
 785       (insert "<#/mml>\n"))
 786      ((stringp (car handle))
 787       (mapcar 'mml-insert-mime (cdr handle))
 788       (insert "<#/multipart>\n"))
 789      (textp
 790       (let ((charset (mail-content-type-get
 791                       (mm-handle-type handle) 'charset))
 792             (start (point)))
 793         (if (eq charset 'gnus-decoded)
 794             (mm-insert-part handle)
 795           (insert (mm-decode-string (mm-get-part handle) charset)))
 796         (mml-quote-region start (point)))
 797       (goto-char (point-max)))
 798      (t
 799       (insert "<#/part>\n")))))
 800
 801 (defun mml-insert-mml-markup (handle &optional buffer nofile mmlp)
 802   "Take a MIME handle and insert an MML tag."
 803   (if (stringp (car handle))
 804       (progn
 805         (insert "<#multipart type=" (mm-handle-media-subtype handle))
 806         (let ((start (mm-handle-multipart-ctl-parameter handle 'start)))
 807           (when start
 808             (insert " start=\"" start "\"")))
 809         (insert ">\n"))
 810     (if mmlp
 811         (insert "<#mml type=" (mm-handle-media-type handle))
 812       (insert "<#part type=" (mm-handle-media-type handle)))
 813     (dolist (elem (append (cdr (mm-handle-type handle))
 814                           (cdr (mm-handle-disposition handle))))
 815       (unless (symbolp (cdr elem))
 816         (insert " " (symbol-name (car elem)) "=\"" (cdr elem) "\"")))
 817     (when (mm-handle-id handle)
 818       (insert " id=\"" (mm-handle-id handle) "\""))
 819     (when (mm-handle-disposition handle)
 820       (insert " disposition=" (car (mm-handle-disposition handle))))
 821     (when buffer
 822       (insert " buffer=\"" (buffer-name buffer) "\""))
 823     (when nofile
 824       (insert " nofile=yes"))
 825     (when (mm-handle-description handle)
 826       (insert " description=\"" (mm-handle-description handle) "\""))
 827     (insert ">\n")))
 828
 829 (defun mml-insert-parameter (&rest parameters)
 830   "Insert PARAMETERS in a nice way."
 831   (dolist (param parameters)
 832     (insert ";")
 833     (let ((point (point)))
 834       (insert " " param)
 835       (when (> (current-column) 71)
 836         (goto-char point)
 837         (insert "\n ")
 838         (end-of-line)))))
 839
 840 ;;;
 841 ;;; Mode for inserting and editing MML forms
 842 ;;;
 843
 844 (defvar mml-mode-map
 845   (let ((sign (make-sparse-keymap))
 846         (encrypt (make-sparse-keymap))
 847         (signpart (make-sparse-keymap))
 848         (encryptpart (make-sparse-keymap))
 849         (map (make-sparse-keymap))
 850         (main (make-sparse-keymap)))
 851     (define-key sign "p" 'mml-secure-message-sign-pgpmime)
 852     (define-key sign "o" 'mml-secure-message-sign-pgp)
 853     (define-key sign "s" 'mml-secure-message-sign-smime)
 854     (define-key signpart "p" 'mml-secure-sign-pgpmime)
 855     (define-key signpart "o" 'mml-secure-sign-pgp)
 856     (define-key signpart "s" 'mml-secure-sign-smime)
 857     (define-key encrypt "p" 'mml-secure-message-encrypt-pgpmime)
 858     (define-key encrypt "o" 'mml-secure-message-encrypt-pgp)
 859     (define-key encrypt "s" 'mml-secure-message-encrypt-smime)
 860     (define-key encryptpart "p" 'mml-secure-encrypt-pgpmime)
 861     (define-key encryptpart "o" 'mml-secure-encrypt-pgp)
 862     (define-key encryptpart "s" 'mml-secure-encrypt-smime)
 863     (define-key map "\C-n" 'mml-unsecure-message)
 864     (define-key map "f" 'mml-attach-file)
 865     (define-key map "b" 'mml-attach-buffer)
 866     (define-key map "e" 'mml-attach-external)
 867     (define-key map "q" 'mml-quote-region)
 868     (define-key map "m" 'mml-insert-multipart)
 869     (define-key map "p" 'mml-insert-part)
 870     (define-key map "v" 'mml-validate)
 871     (define-key map "P" 'mml-preview)
 872     (define-key map "s" sign)
 873     (define-key map "S" signpart)
 874     (define-key map "c" encrypt)
 875     (define-key map "C" encryptpart)
 876     ;;(define-key map "n" 'mml-narrow-to-part)
 877     ;; `M-m' conflicts with `back-to-indentation'.
 878     ;; (define-key main "\M-m" map)
 879     (define-key main "\C-c\C-m" map)
 880     main))
 881
 882 (easy-menu-define
 883   mml-menu mml-mode-map ""
 884   `("Attachments"
 885     ["Attach File..." mml-attach-file
 886      ,@(if (featurep 'xemacs) '(t)
 887          '(:help "Attach a file at point"))]
 888     ["Attach Buffer..." mml-attach-buffer t]
 889     ["Attach External..." mml-attach-external t]
 890     ["Insert Part..." mml-insert-part t]
 891     ["Insert Multipart..." mml-insert-multipart t]
 892     ["PGP/MIME Sign" mml-secure-message-sign-pgpmime t]
 893     ["PGP/MIME Encrypt" mml-secure-message-encrypt-pgpmime t]
 894     ["PGP Sign" mml-secure-message-sign-pgp t]
 895     ["PGP Encrypt" mml-secure-message-encrypt-pgp t]
 896     ["S/MIME Sign" mml-secure-message-sign-smime t]
 897     ["S/MIME Encrypt" mml-secure-message-encrypt-smime t]
 898     ("Secure MIME part"
 899      ["PGP/MIME Sign Part" mml-secure-sign-pgpmime t]
 900      ["PGP/MIME Encrypt Part" mml-secure-encrypt-pgpmime t]
 901      ["PGP Sign Part" mml-secure-sign-pgp t]
 902      ["PGP Encrypt Part" mml-secure-encrypt-pgp t]
 903      ["S/MIME Sign Part" mml-secure-sign-smime t]
 904      ["S/MIME Encrypt Part" mml-secure-encrypt-smime t])
 905     ["Encrypt/Sign off" mml-unsecure-message t]
 906     ;;["Narrow" mml-narrow-to-part t]
 907     ["Quote MML" mml-quote-region t]
 908     ["Validate MML" mml-validate t]
 909     ["Preview" mml-preview t]))
 910
 911 (defvar mml-mode nil
 912   "Minor mode for editing MML.")
 913
 914 (defun mml-mode (&optional arg)
 915   "Minor mode for editing MML.
 916 MML is the MIME Meta Language, a minor mode for composing MIME articles.
 917 See Info node `(emacs-mime)Composing'.
 918
 919 \\{mml-mode-map}"
 920   (interactive "P")
 921   (when (set (make-local-variable 'mml-mode)
 922              (if (null arg) (not mml-mode)
 923                (> (prefix-numeric-value arg) 0)))
 924     (gnus-add-minor-mode 'mml-mode " MML" mml-mode-map)
 925     (easy-menu-add mml-menu mml-mode-map)
 926     (run-hooks 'mml-mode-hook)))
 927
 928 ;;;
 929 ;;; Helper functions for reading MIME stuff from the minibuffer and
 930 ;;; inserting stuff to the buffer.
 931 ;;;
 932
 933 (defun mml-minibuffer-read-file (prompt)
 934   (let* ((completion-ignored-extensions nil)
 935          (file (read-file-name prompt nil nil t)))
 936     ;; Prevent some common errors.  This is inspired by similar code in
 937     ;; VM.
 938     (when (file-directory-p file)
 939       (error "%s is a directory, cannot attach" file))
 940     (unless (file-exists-p file)
 941       (error "No such file: %s" file))
 942     (unless (file-readable-p file)
 943       (error "Permission denied: %s" file))
 944     file))
 945
 946 (defun mml-minibuffer-read-type (name &optional default)
 947   (mailcap-parse-mimetypes)
 948   (let* ((default (or default
 949                       (mm-default-file-encoding name)
 950                       ;; Perhaps here we should check what the file
 951                       ;; looks like, and offer text/plain if it looks
 952                       ;; like text/plain.
 953                       "application/octet-stream"))
 954          (string (completing-read
 955                   (format "Content type (default %s): " default)
 956                   (mapcar 'list (mailcap-mime-types)))))
 957     (if (not (equal string ""))
 958         string
 959       default)))
 960
 961 (defun mml-minibuffer-read-description ()
 962   (let ((description (read-string "One line description: ")))
 963     (when (string-match "\\`[ \t]*\\'" description)
 964       (setq description nil))
 965     description))
 966
 967 (defun mml-minibuffer-read-disposition (type &optional default)
 968   (unless default (setq default
 969                         (if (and (string-match "\\`text/" type)
 970                                  (not (string-match "\\`text/rtf\\'" type)))
 971                             "inline"
 972                           "attachment")))
 973   (let ((disposition (completing-read
 974                       (format "Disposition (default %s): " default)
 975                       '(("attachment") ("inline") (""))
 976                       nil t nil nil default)))
 977     (if (not (equal disposition ""))
 978         disposition
 979       default)))
 980
 981 (defun mml-quote-region (beg end)
 982   "Quote the MML tags in the region."
 983   (interactive "r")
 984   (save-excursion
 985     (save-restriction
 986       ;; Temporarily narrow the region to defend from changes
 987       ;; invalidating END.
 988       (narrow-to-region beg end)
 989       (goto-char (point-min))
 990       ;; Quote parts.
 991       (while (re-search-forward
 992               "<#!*/?\\(multipart\\|part\\|external\\|mml\\)" nil t)
 993         ;; Insert ! after the #.
 994         (goto-char (+ (match-beginning 0) 2))
 995         (insert "!")))))
 996
 997 (defun mml-insert-tag (name &rest plist)
 998   "Insert an MML tag described by NAME and PLIST."
 999   (when (symbolp name)
1000     (setq name (symbol-name name)))
1001   (insert "<#" name)
1002   (while plist
1003     (let ((key (pop plist))
1004           (value (pop plist)))
1005       (when value
1006         ;; Quote VALUE if it contains suspicious characters.
1007         (when (string-match "[\"'\\~/*;() \t\n]" value)
1008           (setq value (with-output-to-string
1009                         (let (print-escape-nonascii)
1010                           (prin1 value)))))
1011         (insert (format " %s=%s" key value)))))
1012   (insert ">\n"))
1013
1014 (defun mml-insert-empty-tag (name &rest plist)
1015   "Insert an empty MML tag described by NAME and PLIST."
1016   (when (symbolp name)
1017     (setq name (symbol-name name)))
1018   (apply #'mml-insert-tag name plist)
1019   (insert "<#/" name ">\n"))
1020
1021 ;;; Attachment functions.
1022
1023 (defun mml-attach-file (file &optional type description disposition)
1024   "Attach a file to the outgoing MIME message.
1025 The file is not inserted or encoded until you send the message with
1026 `\\[message-send-and-exit]' or `\\[message-send]'.
1027
1028 FILE is the name of the file to attach.  TYPE is its content-type, a
1029 string of the form \"type/subtype\".  DESCRIPTION is a one-line
1030 description of the attachment."
1031   (interactive
1032    (let* ((file (mml-minibuffer-read-file "Attach file: "))
1033           (type (mml-minibuffer-read-type file))
1034           (description (mml-minibuffer-read-description))
1035           (disposition (mml-minibuffer-read-disposition type)))
1036      (list file type description disposition)))
1037   (mml-insert-empty-tag 'part
1038                         'type type
1039                         'filename file
1040                         'disposition (or disposition "attachment")
1041                         'description description))
1042
1043 (defun mml-attach-buffer (buffer &optional type description)
1044   "Attach a buffer to the outgoing MIME message.
1045 See `mml-attach-file' for details of operation."
1046   (interactive
1047    (let* ((buffer (read-buffer "Attach buffer: "))
1048           (type (mml-minibuffer-read-type buffer "text/plain"))
1049           (description (mml-minibuffer-read-description)))
1050      (list buffer type description)))
1051   (mml-insert-empty-tag 'part 'type type 'buffer buffer
1052                         'disposition "attachment" 'description description))
1053
1054 (defun mml-attach-external (file &optional type description)
1055   "Attach an external file into the buffer.
1056 FILE is an ange-ftp/efs specification of the part location.
1057 TYPE is the MIME type to use."
1058   (interactive
1059    (let* ((file (mml-minibuffer-read-file "Attach external file: "))
1060           (type (mml-minibuffer-read-type file))
1061           (description (mml-minibuffer-read-description)))
1062      (list file type description)))
1063   (mml-insert-empty-tag 'external 'type type 'name file
1064                         'disposition "attachment" 'description description))
1065
1066 (defun mml-insert-multipart (&optional type)
1067   (interactive (list (completing-read "Multipart type (default mixed): "
1068                                       '(("mixed") ("alternative") ("digest") ("parallel")
1069                                         ("signed") ("encrypted"))
1070                                       nil nil "mixed")))
1071   (or type
1072       (setq type "mixed"))
1073   (mml-insert-empty-tag "multipart" 'type type)
1074   (forward-line -1))
1075
1076 (defun mml-insert-part (&optional type)
1077   (interactive
1078    (list (mml-minibuffer-read-type "")))
1079   (mml-insert-tag 'part 'type type 'disposition "inline")
1080   (forward-line -1))
1081
1082 (defun mml-preview-insert-mail-followup-to ()
1083   "Insert a Mail-Followup-To header before previewing an article.
1084 Should be adopted if code in `message-send-mail' is changed."
1085   (when (and (message-mail-p)
1086              (message-subscribed-p)
1087              (not (mail-fetch-field "mail-followup-to"))
1088              (message-make-mail-followup-to))
1089     (message-position-on-field "Mail-Followup-To" "X-Draft-From")
1090     (insert (message-make-mail-followup-to))))
1091
1092 (defun mml-preview (&optional raw)
1093   "Display current buffer with Gnus, in a new buffer.
1094 If RAW, don't highlight the article."
1095   (interactive "P")
1096   (save-excursion
1097     (let* ((buf (current-buffer))
1098            (message-options message-options)
1099            (message-this-is-mail (message-mail-p))
1100            (message-this-is-news (message-news-p))
1101            (message-posting-charset (or (gnus-setup-posting-charset
1102                                          (save-restriction
1103                                            (message-narrow-to-headers-or-head)
1104                                            (message-fetch-field "Newsgroups")))
1105                                         message-posting-charset)))
1106       (message-options-set-recipient)
1107       (pop-to-buffer (generate-new-buffer
1108                       (concat (if raw "*Raw MIME preview of "
1109                                 "*MIME preview of ") (buffer-name))))
1110       (when (boundp 'gnus-buffers)
1111         (push (current-buffer) gnus-buffers))
1112       (erase-buffer)
1113       (insert-buffer-substring buf)
1114       (mml-preview-insert-mail-followup-to)
1115       (let ((message-deletable-headers (if (message-news-p)
1116                                            nil
1117                                          message-deletable-headers)))
1118         (message-generate-headers
1119          (copy-sequence (if (message-news-p)
1120                             message-required-news-headers
1121                           message-required-mail-headers))))
1122       (if (re-search-forward
1123            (concat "^" (regexp-quote mail-header-separator) "\n") nil t)
1124           (replace-match "\n"))
1125       (let ((mail-header-separator ""));; mail-header-separator is removed.
1126         (mml-to-mime))
1127       (if raw
1128           (when (fboundp 'set-buffer-multibyte)
1129             (let ((s (buffer-string)))
1130               ;; Insert the content into unibyte buffer.
1131               (erase-buffer)
1132               (mm-disable-multibyte)
1133               (insert s)))
1134         (let ((gnus-newsgroup-charset (car message-posting-charset))
1135               gnus-article-prepare-hook gnus-original-article-buffer)
1136           (run-hooks 'gnus-article-decode-hook)
1137           (let ((gnus-newsgroup-name "dummy")
1138                 (gnus-newsrc-hashtb (or gnus-newsrc-hashtb
1139                                         (gnus-make-hashtable 5))))
1140             (gnus-article-prepare-display))))
1141       ;; Disable article-mode-map.
1142       (use-local-map nil)
1143       (gnus-make-local-hook 'kill-buffer-hook)
1144       (add-hook 'kill-buffer-hook
1145                 (lambda ()
1146                   (mm-destroy-parts gnus-article-mime-handles)) nil t)
1147       (setq buffer-read-only t)
1148       (local-set-key "q" (lambda () (interactive) (kill-buffer nil)))
1149       (local-set-key "=" (lambda () (interactive) (delete-other-windows)))
1150       (local-set-key "\r"
1151                      (lambda ()
1152                        (interactive)
1153                        (widget-button-press (point))))
1154       (local-set-key gnus-mouse-2
1155                      (lambda (event)
1156                        (interactive "@e")
1157                        (widget-button-press (widget-event-point event) event)))
1158       (goto-char (point-min)))))
1159
1160 (defun mml-validate ()
1161   "Validate the current MML document."
1162   (interactive)
1163   (mml-parse))
1164
1165 (defun mml-tweak-part (cont)
1166   "Tweak a MML part."
1167   (let ((tweak (cdr (assq 'tweak cont)))
1168         func)
1169     (cond
1170      (tweak
1171       (setq func
1172             (or (cdr (assoc tweak mml-tweak-function-alist))
1173                 (intern tweak))))
1174      (mml-tweak-type-alist
1175       (let ((alist mml-tweak-type-alist)
1176             (type (or (cdr (assq 'type cont)) "text/plain")))
1177         (while alist
1178           (if (string-match (caar alist) type)
1179               (setq func (cdar alist)
1180                     alist nil)
1181             (setq alist (cdr alist)))))))
1182     (if func
1183         (funcall func cont)
1184       cont)
1185     (let ((alist mml-tweak-sexp-alist))
1186       (while alist
1187         (if (eval (caar alist))
1188             (funcall (cdar alist) cont))
1189         (setq alist (cdr alist)))))
1190   cont)
1191
1192 (defun mml-tweak-externalize-attachments (cont)
1193   "Tweak attached files as external parts."
1194   (let (filename-cons)
1195     (when (and (eq (car cont) 'part)
1196                (not (cdr (assq 'buffer cont)))
1197                (and (setq filename-cons (assq 'filename cont))
1198                     (not (equal (cdr (assq 'nofile cont)) "yes"))))
1199       (setcar cont 'external)
1200       (setcar filename-cons 'name))))
1201
1202 (provide 'mml)
1203
1204 ;;; arch-tag: 583c96cf-1ffe-451b-a5e5-4733ae9ddd12
1205 ;;; mml.el ends here