lisp/gnus/mml.el

   1 ;;; mml.el --- A package for parsing and validating MML documents
   2
   3 ;; Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004,
   4 ;;   2005 Free Software Foundation, Inc.
   5
   6 ;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
   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 2, or (at your option)
  12 ;; 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; see the file COPYING.  If not, write to the
  21 ;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  22 ;; Boston, MA 02110-1301, USA.
  23
  24 ;;; Commentary:
  25
  26 ;;; Code:
  27
  28 (require 'mm-util)
  29 (require 'mm-bodies)
  30 (require 'mm-encode)
  31 (require 'mm-decode)
  32 (require 'mml-sec)
  33 (eval-when-compile (require 'cl))
  34
  35 (eval-and-compile
  36   (autoload 'message-make-message-id "message")
  37   (autoload 'gnus-setup-posting-charset "gnus-msg")
  38   (autoload 'gnus-add-minor-mode "gnus-ems")
  39   (autoload 'gnus-make-local-hook "gnus-util")
  40   (autoload 'message-fetch-field "message")
  41   (autoload 'fill-flowed-encode "flow-fill")
  42   (autoload 'message-posting-charset "message"))
  43
  44 (defvar gnus-article-mime-handles)
  45 (defvar gnus-mouse-2)
  46 (defvar gnus-newsrc-hashtb)
  47 (defvar message-default-charset)
  48 (defvar message-deletable-headers)
  49 (defvar message-options)
  50 (defvar message-posting-charset)
  51 (defvar message-required-mail-headers)
  52 (defvar message-required-news-headers)
  53
  54 (defcustom mml-content-type-parameters
  55   '(name access-type expiration size permission format)
  56   "*A list of acceptable parameters in MML tag.
  57 These parameters are generated in Content-Type header if exists."
  58   :version "22.1"
  59   :type '(repeat (symbol :tag "Parameter"))
  60   :group 'message)
  61
  62 (defcustom mml-content-disposition-parameters
  63   '(filename creation-date modification-date read-date)
  64   "*A list of acceptable parameters in MML tag.
  65 These parameters are generated in Content-Disposition header if exists."
  66   :version "22.1"
  67   :type '(repeat (symbol :tag "Parameter"))
  68   :group 'message)
  69
  70 (defcustom mml-insert-mime-headers-always nil
  71   "If non-nil, always put Content-Type: text/plain at top of empty parts.
  72 It is necessary to work against a bug in certain clients."
  73   :version "22.1"
  74   :type 'boolean
  75   :group 'message)
  76
  77 (defvar mml-tweak-type-alist nil
  78   "A list of (TYPE . FUNCTION) for tweaking MML parts.
  79 TYPE is a string containing a regexp to match the MIME type.  FUNCTION
  80 is a Lisp function which is called with the MML handle to tweak the
  81 part.  This variable is used only when no TWEAK parameter exists in
  82 the MML handle.")
  83
  84 (defvar mml-tweak-function-alist nil
  85   "A list of (NAME . FUNCTION) for tweaking MML parts.
  86 NAME is a string containing the name of the TWEAK parameter in the MML
  87 handle.  FUNCTION is a Lisp function which is called with the MML
  88 handle to tweak the part.")
  89
  90 (defvar mml-tweak-sexp-alist
  91   '((mml-externalize-attachments . mml-tweak-externalize-attachments))
  92   "A list of (SEXP . FUNCTION) for tweaking MML parts.
  93 SEXP is an s-expression.  If the evaluation of SEXP is non-nil, FUNCTION
  94 is called.  FUNCTION is a Lisp function which is called with the MML
  95 handle to tweak the part.")
  96
  97 (defvar mml-externalize-attachments nil
  98   "*If non-nil, local-file attachments are generated as external parts.")
  99
 100 (defvar mml-generate-multipart-alist nil
 101   "*Alist of multipart generation functions.
 102 Each entry has the form (NAME . FUNCTION), where
 103 NAME is a string containing the name of the part (without the
 104 leading \"/multipart/\"),
 105 FUNCTION is a Lisp function which is called to generate the part.
 106
 107 The Lisp function has to supply the appropriate MIME headers and the
 108 contents of this part.")
 109
 110 (defvar mml-syntax-table
 111   (let ((table (copy-syntax-table emacs-lisp-mode-syntax-table)))
 112     (modify-syntax-entry ?\\ "/" table)
 113     (modify-syntax-entry ?< "(" table)
 114     (modify-syntax-entry ?> ")" table)
 115     (modify-syntax-entry ?@ "w" table)
 116     (modify-syntax-entry ?/ "w" table)
 117     (modify-syntax-entry ?= " " table)
 118     (modify-syntax-entry ?* " " table)
 119     (modify-syntax-entry ?\; " " table)
 120     (modify-syntax-entry ?\' " " table)
 121     table))
 122
 123 (defvar mml-boundary-function 'mml-make-boundary
 124   "A function called to suggest a boundary.
 125 The function may be called several times, and should try to make a new
 126 suggestion each time.  The function is called with one parameter,
 127 which is a number that says how many times the function has been
 128 called for this message.")
 129
 130 (defvar mml-confirmation-set nil
 131   "A list of symbols, each of which disables some warning.
 132 `unknown-encoding': always send messages contain characters with
 133 unknown encoding; `use-ascii': always use ASCII for those characters
 134 with unknown encoding; `multipart': always send messages with more than
 135 one charsets.")
 136
 137 (defvar mml-generate-default-type "text/plain"
 138   "Content type by which the Content-Type header can be omitted.
 139 The Content-Type header will not be put in the MIME part if the type
 140 equals the value and there's no parameter (e.g. charset, format, etc.)
 141 and `mml-insert-mime-headers-always' is nil.  The value will be bound
 142 to \"message/rfc822\" when encoding an article to be forwarded as a MIME
 143 part.  This is for the internal use, you should never modify the value.")
 144
 145 (defvar mml-buffer-list nil)
 146
 147 (defun mml-generate-new-buffer (name)
 148   (let ((buf (generate-new-buffer name)))
 149     (push buf mml-buffer-list)
 150     buf))
 151
 152 (defun mml-destroy-buffers ()
 153   (let (kill-buffer-hook)
 154     (mapcar 'kill-buffer mml-buffer-list)
 155     (setq mml-buffer-list nil)))
 156
 157 (defun mml-parse ()
 158   "Parse the current buffer as an MML document."
 159   (save-excursion
 160     (goto-char (point-min))
 161     (let ((table (syntax-table)))
 162       (unwind-protect
 163           (progn
 164             (set-syntax-table mml-syntax-table)
 165             (mml-parse-1))
 166         (set-syntax-table table)))))
 167
 168 (defun mml-parse-1 ()
 169   "Parse the current buffer as an MML document."
 170   (let (struct tag point contents charsets warn use-ascii no-markup-p raw)
 171     (while (and (not (eobp))
 172                 (not (looking-at "<#/multipart")))
 173       (cond
 174        ((looking-at "<#secure")
 175         ;; The secure part is essentially a meta-meta tag, which
 176         ;; expands to either a part tag if there are no other parts in
 177         ;; the document or a multipart tag if there are other parts
 178         ;; included in the message
 179         (let* (secure-mode
 180                (taginfo (mml-read-tag))
 181                (recipients (cdr (assq 'recipients taginfo)))
 182                (sender (cdr (assq 'sender taginfo)))
 183                (location (cdr (assq 'tag-location taginfo)))
 184                (mode (cdr (assq 'mode taginfo)))
 185                (method (cdr (assq 'method taginfo)))
 186                tags)
 187           (save-excursion
 188             (if
 189                 (re-search-forward
 190                  "<#\\(/\\)?\\(multipart\\|part\\|external\\|mml\\)." nil t)
 191                 (setq secure-mode "multipart")
 192               (setq secure-mode "part")))
 193           (save-excursion
 194             (goto-char location)
 195             (re-search-forward "<#secure[^\n]*>\n"))
 196           (delete-region (match-beginning 0) (match-end 0))
 197           (cond ((string= mode "sign")
 198                  (setq tags (list "sign" method)))
 199                 ((string= mode "encrypt")
 200                  (setq tags (list "encrypt" method)))
 201                 ((string= mode "signencrypt")
 202                  (setq tags (list "sign" method "encrypt" method))))
 203           (eval `(mml-insert-tag ,secure-mode
 204                                  ,@tags
 205                                  ,(if recipients "recipients")
 206                                  ,recipients
 207                                  ,(if sender "sender")
 208                                  ,sender))
 209           ;; restart the parse
 210           (goto-char location)))
 211        ((looking-at "<#multipart")
 212         (push (nconc (mml-read-tag) (mml-parse-1)) struct))
 213        ((looking-at "<#external")
 214         (push (nconc (mml-read-tag) (list (cons 'contents (mml-read-part))))
 215               struct))
 216        (t
 217         (if (or (looking-at "<#part") (looking-at "<#mml"))
 218             (setq tag (mml-read-tag)
 219                   no-markup-p nil
 220                   warn nil)
 221           (setq tag (list 'part '(type . "text/plain"))
 222                 no-markup-p t
 223                 warn t))
 224         (setq raw (cdr (assq 'raw tag))
 225               point (point)
 226               contents (mml-read-part (eq 'mml (car tag)))
 227               charsets (cond
 228                         (raw nil)
 229                         ((assq 'charset tag)
 230                          (list
 231                           (intern (downcase (cdr (assq 'charset tag))))))
 232                         (t
 233                          (mm-find-mime-charset-region point (point)
 234                                                       mm-hack-charsets))))
 235         (when (and (not raw) (memq nil charsets))
 236           (if (or (memq 'unknown-encoding mml-confirmation-set)
 237                   (message-options-get 'unknown-encoding)
 238                   (and (y-or-n-p "\
 239 Message contains characters with unknown encoding.  Really send? ")
 240                        (message-options-set 'unknown-encoding t)))
 241               (if (setq use-ascii
 242                         (or (memq 'use-ascii mml-confirmation-set)
 243                             (message-options-get 'use-ascii)
 244                             (and (y-or-n-p "Use ASCII as charset? ")
 245                                  (message-options-set 'use-ascii t))))
 246                   (setq charsets (delq nil charsets))
 247                 (setq warn nil))
 248             (error "Edit your message to remove those characters")))
 249         (if (or raw
 250                 (eq 'mml (car tag))
 251                 (< (length charsets) 2))
 252             (if (or (not no-markup-p)
 253                     (string-match "[^ \t\r\n]" contents))
 254                 ;; Don't create blank parts.
 255                 (push (nconc tag (list (cons 'contents contents)))
 256                       struct))
 257           (let ((nstruct (mml-parse-singlepart-with-multiple-charsets
 258                           tag point (point) use-ascii)))
 259             (when (and warn
 260                        (not (memq 'multipart mml-confirmation-set))
 261                        (not (message-options-get 'multipart))
 262                        (not (and (y-or-n-p (format "\
 263 A message part needs to be split into %d charset parts.  Really send? "
 264                                                    (length nstruct)))
 265                                  (message-options-set 'multipart t))))
 266               (error "Edit your message to use only one charset"))
 267             (setq struct (nconc nstruct struct)))))))
 268     (unless (eobp)
 269       (forward-line 1))
 270     (nreverse struct)))
 271
 272 (defun mml-parse-singlepart-with-multiple-charsets
 273   (orig-tag beg end &optional use-ascii)
 274   (save-excursion
 275     (save-restriction
 276       (narrow-to-region beg end)
 277       (goto-char (point-min))
 278       (let ((current (or (mm-mime-charset (mm-charset-after))
 279                          (and use-ascii 'us-ascii)))
 280             charset struct space newline paragraph)
 281         (while (not (eobp))
 282           (setq charset (mm-mime-charset (mm-charset-after)))
 283           (cond
 284            ;; The charset remains the same.
 285            ((eq charset 'us-ascii))
 286            ((or (and use-ascii (not charset))
 287                 (eq charset current))
 288             (setq space nil
 289                   newline nil
 290                   paragraph nil))
 291            ;; The initial charset was ascii.
 292            ((eq current 'us-ascii)
 293             (setq current charset
 294                   space nil
 295                   newline nil
 296                   paragraph nil))
 297            ;; We have a change in charsets.
 298            (t
 299             (push (append
 300                    orig-tag
 301                    (list (cons 'contents
 302                                (buffer-substring-no-properties
 303                                 beg (or paragraph newline space (point))))))
 304                   struct)
 305             (setq beg (or paragraph newline space (point))
 306                   current charset
 307                   space nil
 308                   newline nil
 309                   paragraph nil)))
 310           ;; Compute places where it might be nice to break the part.
 311           (cond
 312            ((memq (following-char) '(?  ?\t))
 313             (setq space (1+ (point))))
 314            ((and (eq (following-char) ?\n)
 315                  (not (bobp))
 316                  (eq (char-after (1- (point))) ?\n))
 317             (setq paragraph (point)))
 318            ((eq (following-char) ?\n)
 319             (setq newline (1+ (point)))))
 320           (forward-char 1))
 321         ;; Do the final part.
 322         (unless (= beg (point))
 323           (push (append orig-tag
 324                         (list (cons 'contents
 325                                     (buffer-substring-no-properties
 326                                      beg (point)))))
 327                 struct))
 328         struct))))
 329
 330 (defun mml-read-tag ()
 331   "Read a tag and return the contents."
 332   (let ((orig-point (point))
 333         contents name elem val)
 334     (forward-char 2)
 335     (setq name (buffer-substring-no-properties
 336                 (point) (progn (forward-sexp 1) (point))))
 337     (skip-chars-forward " \t\n")
 338     (while (not (looking-at ">[ \t]*\n?"))
 339       (setq elem (buffer-substring-no-properties
 340                   (point) (progn (forward-sexp 1) (point))))
 341       (skip-chars-forward "= \t\n")
 342       (setq val (buffer-substring-no-properties
 343                  (point) (progn (forward-sexp 1) (point))))
 344       (when (string-match "^\"\\(.*\\)\"$" val)
 345         (setq val (match-string 1 val)))
 346       (push (cons (intern elem) val) contents)
 347       (skip-chars-forward " \t\n"))
 348     (goto-char (match-end 0))
 349     ;; Don't skip the leading space.
 350     ;;(skip-chars-forward " \t\n")
 351     ;; Put the tag location into the returned contents
 352     (setq contents (append (list (cons 'tag-location orig-point)) contents))
 353     (cons (intern name) (nreverse contents))))
 354
 355 (defun mml-buffer-substring-no-properties-except-hard-newlines (start end)
 356   (let ((str (buffer-substring-no-properties start end))
 357         (bufstart start) tmp)
 358     (while (setq tmp (text-property-any start end 'hard 't))
 359       (set-text-properties (- tmp bufstart) (- tmp bufstart -1)
 360                            '(hard t) str)
 361       (setq start (1+ tmp)))
 362     str))
 363
 364 (defun mml-read-part (&optional mml)
 365   "Return the buffer up till the next part, multipart or closing part or multipart.
 366 If MML is non-nil, return the buffer up till the correspondent mml tag."
 367   (let ((beg (point)) (count 1))
 368     ;; If the tag ended at the end of the line, we go to the next line.
 369     (when (looking-at "[ \t]*\n")
 370       (forward-line 1))
 371     (if mml
 372         (progn
 373           (while (and (> count 0) (not (eobp)))
 374             (if (re-search-forward "<#\\(/\\)?mml." nil t)
 375                 (setq count (+ count (if (match-beginning 1) -1 1)))
 376               (goto-char (point-max))))
 377           (mml-buffer-substring-no-properties-except-hard-newlines
 378            beg (if (> count 0)
 379                    (point)
 380                  (match-beginning 0))))
 381       (if (re-search-forward
 382            "<#\\(/\\)?\\(multipart\\|part\\|external\\|mml\\)." nil t)
 383           (prog1
 384               (mml-buffer-substring-no-properties-except-hard-newlines
 385                beg (match-beginning 0))
 386             (if (or (not (match-beginning 1))
 387                     (equal (match-string 2) "multipart"))
 388                 (goto-char (match-beginning 0))
 389               (when (looking-at "[ \t]*\n")
 390                 (forward-line 1))))
 391         (mml-buffer-substring-no-properties-except-hard-newlines
 392          beg (goto-char (point-max)))))))
 393
 394 (defvar mml-boundary nil)
 395 (defvar mml-base-boundary "-=-=")
 396 (defvar mml-multipart-number 0)
 397
 398 (defun mml-generate-mime ()
 399   "Generate a MIME message based on the current MML document."
 400   (let ((cont (mml-parse))
 401         (mml-multipart-number mml-multipart-number))
 402     (if (not cont)
 403         nil
 404       (with-temp-buffer
 405         (if (and (consp (car cont))
 406                  (= (length cont) 1))
 407             (mml-generate-mime-1 (car cont))
 408           (mml-generate-mime-1 (nconc (list 'multipart '(type . "mixed"))
 409                                       cont)))
 410         (buffer-string)))))
 411
 412 (defun mml-generate-mime-1 (cont)
 413   (let ((mm-use-ultra-safe-encoding
 414          (or mm-use-ultra-safe-encoding (assq 'sign cont))))
 415     (save-restriction
 416       (narrow-to-region (point) (point))
 417       (mml-tweak-part cont)
 418       (cond
 419        ((or (eq (car cont) 'part) (eq (car cont) 'mml))
 420         (let* ((raw (cdr (assq 'raw cont)))
 421                (filename (cdr (assq 'filename cont)))
 422                (type (or (cdr (assq 'type cont))
 423                          (if filename
 424                              (or (mm-default-file-encoding filename)
 425                                  "application/octet-stream")
 426                            "text/plain")))
 427                coded encoding charset flowed)
 428           (if (and (not raw)
 429                    (member (car (split-string type "/")) '("text" "message")))
 430               (progn
 431                 (with-temp-buffer
 432                   (setq charset (mm-charset-to-coding-system
 433                                  (cdr (assq 'charset cont))))
 434                   (when (eq charset 'ascii)
 435                     (setq charset nil))
 436                   (cond
 437                    ((cdr (assq 'buffer cont))
 438                     (insert-buffer-substring (cdr (assq 'buffer cont))))
 439                    ((and filename
 440                          (not (equal (cdr (assq 'nofile cont)) "yes")))
 441                     (let ((coding-system-for-read charset))
 442                       (mm-insert-file-contents filename)))
 443                    ((eq 'mml (car cont))
 444                     (insert (cdr (assq 'contents cont))))
 445                    (t
 446                     (save-restriction
 447                       (narrow-to-region (point) (point))
 448                       (insert (cdr (assq 'contents cont)))
 449                       ;; Remove quotes from quoted tags.
 450                       (goto-char (point-min))
 451                       (while (re-search-forward
 452                               "<#!+/?\\(part\\|multipart\\|external\\|mml\\)"
 453                               nil t)
 454                         (delete-region (+ (match-beginning 0) 2)
 455                                        (+ (match-beginning 0) 3))))))
 456                   (cond
 457                    ((eq (car cont) 'mml)
 458                     (let ((mml-boundary (mml-compute-boundary cont))
 459                           ;; It is necessary for the case where this
 460                           ;; function is called recursively since
 461                           ;; `m-g-d-t' will be bound to "message/rfc822"
 462                           ;; when encoding an article to be forwarded.
 463                           (mml-generate-default-type "text/plain"))
 464                       (mml-to-mime))
 465                     (let ((mm-7bit-chars (concat mm-7bit-chars "\x1b")))
 466                       ;; ignore 0x1b, it is part of iso-2022-jp
 467                       (setq encoding (mm-body-7-or-8))))
 468                    ((string= (car (split-string type "/")) "message")
 469                     (let ((mm-7bit-chars (concat mm-7bit-chars "\x1b")))
 470                       ;; ignore 0x1b, it is part of iso-2022-jp
 471                       (setq encoding (mm-body-7-or-8))))
 472                    (t
 473                     ;; Only perform format=flowed filling on text/plain
 474                     ;; parts where there either isn't a format parameter
 475                     ;; in the mml tag or it says "flowed" and there
 476                     ;; actually are hard newlines in the text.
 477                     (let (use-hard-newlines)
 478                       (when (and (string= type "text/plain")
 479                                  (not (string= (cdr (assq 'sign cont)) "pgp"))
 480                                  (or (null (assq 'format cont))
 481                                      (string= (cdr (assq 'format cont))
 482                                               "flowed"))
 483                                  (setq use-hard-newlines
 484                                        (text-property-any
 485                                         (point-min) (point-max) 'hard 't)))
 486                         (fill-flowed-encode)
 487                         ;; Indicate that `mml-insert-mime-headers' should
 488                         ;; insert a "; format=flowed" string unless the
 489                         ;; user has already specified it.
 490                         (setq flowed (null (assq 'format cont)))))
 491                     (setq charset (mm-encode-body charset))
 492                     (setq encoding (mm-body-encoding
 493                                     charset (cdr (assq 'encoding cont))))))
 494                   (setq coded (buffer-string)))
 495                 (mml-insert-mime-headers cont type charset encoding flowed)
 496                 (insert "\n")
 497                 (insert coded))
 498             (mm-with-unibyte-buffer
 499               (cond
 500                ((cdr (assq 'buffer cont))
 501                 (insert (with-current-buffer (cdr (assq 'buffer cont))
 502                           (mm-with-unibyte-current-buffer
 503                             (buffer-string)))))
 504                ((and filename
 505                      (not (equal (cdr (assq 'nofile cont)) "yes")))
 506                 (let ((coding-system-for-read mm-binary-coding-system))
 507                   (mm-insert-file-contents filename nil nil nil nil t)))
 508                (t
 509                 (insert (cdr (assq 'contents cont)))))
 510               (setq encoding (mm-encode-buffer type)
 511                     coded (mm-string-as-multibyte (buffer-string))))
 512             (mml-insert-mime-headers cont type charset encoding nil)
 513             (insert "\n")
 514             (mm-with-unibyte-current-buffer
 515               (insert coded)))))
 516        ((eq (car cont) 'external)
 517         (insert "Content-Type: message/external-body")
 518         (let ((parameters (mml-parameter-string
 519                            cont '(expiration size permission)))
 520               (name (cdr (assq 'name cont)))
 521               (url (cdr (assq 'url cont))))
 522           (when name
 523             (setq name (mml-parse-file-name name))
 524             (if (stringp name)
 525                 (mml-insert-parameter
 526                  (mail-header-encode-parameter "name" name)
 527                  "access-type=local-file")
 528               (mml-insert-parameter
 529                (mail-header-encode-parameter
 530                 "name" (file-name-nondirectory (nth 2 name)))
 531                (mail-header-encode-parameter "site" (nth 1 name))
 532                (mail-header-encode-parameter
 533                 "directory" (file-name-directory (nth 2 name))))
 534               (mml-insert-parameter
 535                (concat "access-type="
 536                        (if (member (nth 0 name) '("ftp@" "anonymous@"))
 537                            "anon-ftp"
 538                          "ftp")))))
 539           (when url
 540             (mml-insert-parameter
 541              (mail-header-encode-parameter "url" url)
 542              "access-type=url"))
 543           (when parameters
 544             (mml-insert-parameter-string
 545              cont '(expiration size permission)))
 546           (insert "\n\n")
 547           (insert "Content-Type: "
 548                   (or (cdr (assq 'type cont))
 549                       (if name
 550                           (or (mm-default-file-encoding name)
 551                               "application/octet-stream")
 552                         "text/plain"))
 553                   "\n")
 554           (insert "Content-ID: " (message-make-message-id) "\n")
 555           (insert "Content-Transfer-Encoding: "
 556                   (or (cdr (assq 'encoding cont)) "binary"))
 557           (insert "\n\n")
 558           (insert (or (cdr (assq 'contents cont))))
 559           (insert "\n")))
 560        ((eq (car cont) 'multipart)
 561         (let* ((type (or (cdr (assq 'type cont)) "mixed"))
 562                (mml-generate-default-type (if (equal type "digest")
 563                                               "message/rfc822"
 564                                             "text/plain"))
 565                (handler (assoc type mml-generate-multipart-alist)))
 566           (if handler
 567               (funcall (cdr handler) cont)
 568             ;; No specific handler.  Use default one.
 569             (let ((mml-boundary (mml-compute-boundary cont)))
 570               (insert (format "Content-Type: multipart/%s; boundary=\"%s\""
 571                               type mml-boundary)
 572                       (if (cdr (assq 'start cont))
 573                           (format "; start=\"%s\"\n" (cdr (assq 'start cont)))
 574                         "\n"))
 575               (let ((cont cont) part)
 576                 (while (setq part (pop cont))
 577                   ;; Skip `multipart' and attributes.
 578                   (when (and (consp part) (consp (cdr part)))
 579                     (insert "\n--" mml-boundary "\n")
 580                     (mml-generate-mime-1 part))))
 581               (insert "\n--" mml-boundary "--\n")))))
 582        (t
 583         (error "Invalid element: %S" cont)))
 584       ;; handle sign & encrypt tags in a semi-smart way.
 585       (let ((sign-item (assoc (cdr (assq 'sign cont)) mml-sign-alist))
 586             (encrypt-item (assoc (cdr (assq 'encrypt cont))
 587                                  mml-encrypt-alist))
 588             sender recipients)
 589         (when (or sign-item encrypt-item)
 590           (when (setq sender (cdr (assq 'sender cont)))
 591             (message-options-set 'mml-sender sender)
 592             (message-options-set 'message-sender sender))
 593           (if (setq recipients (cdr (assq 'recipients cont)))
 594               (message-options-set 'message-recipients recipients))
 595           (let ((style (mml-signencrypt-style
 596                         (first (or sign-item encrypt-item)))))
 597             ;; check if: we're both signing & encrypting, both methods
 598             ;; are the same (why would they be different?!), and that
 599             ;; the signencrypt style allows for combined operation.
 600             (if (and sign-item encrypt-item (equal (first sign-item)
 601                                                    (first encrypt-item))
 602                      (equal style 'combined))
 603                 (funcall (nth 1 encrypt-item) cont t)
 604               ;; otherwise, revert to the old behavior.
 605               (when sign-item
 606                 (funcall (nth 1 sign-item) cont))
 607               (when encrypt-item
 608                 (funcall (nth 1 encrypt-item) cont)))))))))
 609
 610 (defun mml-compute-boundary (cont)
 611   "Return a unique boundary that does not exist in CONT."
 612   (let ((mml-boundary (funcall mml-boundary-function
 613                                (incf mml-multipart-number))))
 614     ;; This function tries again and again until it has found
 615     ;; a unique boundary.
 616     (while (not (catch 'not-unique
 617                   (mml-compute-boundary-1 cont))))
 618     mml-boundary))
 619
 620 (defun mml-compute-boundary-1 (cont)
 621   (let (filename)
 622     (cond
 623      ((eq (car cont) 'part)
 624       (with-temp-buffer
 625         (cond
 626          ((cdr (assq 'buffer cont))
 627           (insert-buffer-substring (cdr (assq 'buffer cont))))
 628          ((and (setq filename (cdr (assq 'filename cont)))
 629                (not (equal (cdr (assq 'nofile cont)) "yes")))
 630           (mm-insert-file-contents filename nil nil nil nil t))
 631          (t
 632           (insert (cdr (assq 'contents cont)))))
 633         (goto-char (point-min))
 634         (when (re-search-forward (concat "^--" (regexp-quote mml-boundary))
 635                                  nil t)
 636           (setq mml-boundary (funcall mml-boundary-function
 637                                       (incf mml-multipart-number)))
 638           (throw 'not-unique nil))))
 639      ((eq (car cont) 'multipart)
 640       (mapcar 'mml-compute-boundary-1 (cddr cont))))
 641     t))
 642
 643 (defun mml-make-boundary (number)
 644   (concat (make-string (% number 60) ?=)
 645           (if (> number 17)
 646               (format "%x" number)
 647             "")
 648           mml-base-boundary))
 649
 650 (defun mml-insert-mime-headers (cont type charset encoding flowed)
 651   (let (parameters id disposition description)
 652     (setq parameters
 653           (mml-parameter-string
 654            cont mml-content-type-parameters))
 655     (when (or charset
 656               parameters
 657               flowed
 658               (not (equal type mml-generate-default-type))
 659               mml-insert-mime-headers-always)
 660       (when (consp charset)
 661         (error
 662          "Can't encode a part with several charsets"))
 663       (insert "Content-Type: " type)
 664       (when charset
 665         (insert "; " (mail-header-encode-parameter
 666                       "charset" (symbol-name charset))))
 667       (when flowed
 668         (insert "; format=flowed"))
 669       (when parameters
 670         (mml-insert-parameter-string
 671          cont mml-content-type-parameters))
 672       (insert "\n"))
 673     (when (setq id (cdr (assq 'id cont)))
 674       (insert "Content-ID: " id "\n"))
 675     (setq parameters
 676           (mml-parameter-string
 677            cont mml-content-disposition-parameters))
 678     (when (or (setq disposition (cdr (assq 'disposition cont)))
 679               parameters)
 680       (insert "Content-Disposition: " (or disposition "inline"))
 681       (when parameters
 682         (mml-insert-parameter-string
 683          cont mml-content-disposition-parameters))
 684       (insert "\n"))
 685     (unless (eq encoding '7bit)
 686       (insert (format "Content-Transfer-Encoding: %s\n" encoding)))
 687     (when (setq description (cdr (assq 'description cont)))
 688       (insert "Content-Description: "
 689               (mail-encode-encoded-word-string description) "\n"))))
 690
 691 (defun mml-parameter-string (cont types)
 692   (let ((string "")
 693         value type)
 694     (while (setq type (pop types))
 695       (when (setq value (cdr (assq type cont)))
 696         ;; Strip directory component from the filename parameter.
 697         (when (eq type 'filename)
 698           (setq value (file-name-nondirectory value)))
 699         (setq string (concat string "; "
 700                              (mail-header-encode-parameter
 701                               (symbol-name type) value)))))
 702     (when (not (zerop (length string)))
 703       string)))
 704
 705 (defun mml-insert-parameter-string (cont types)
 706   (let (value type)
 707     (while (setq type (pop types))
 708       (when (setq value (cdr (assq type cont)))
 709         ;; Strip directory component from the filename parameter.
 710         (when (eq type 'filename)
 711           (setq value (file-name-nondirectory value)))
 712         (mml-insert-parameter
 713          (mail-header-encode-parameter
 714           (symbol-name type) value))))))
 715
 716 (eval-when-compile
 717   (defvar ange-ftp-name-format)
 718   (defvar efs-path-regexp))
 719 (defun mml-parse-file-name (path)
 720   (if (if (boundp 'efs-path-regexp)
 721           (string-match efs-path-regexp path)
 722         (if (boundp 'ange-ftp-name-format)
 723             (string-match (car ange-ftp-name-format) path)))
 724       (list (match-string 1 path) (match-string 2 path)
 725             (substring path (1+ (match-end 2))))
 726     path))
 727
 728 (defun mml-insert-buffer (buffer)
 729   "Insert BUFFER at point and quote any MML markup."
 730   (save-restriction
 731     (narrow-to-region (point) (point))
 732     (insert-buffer-substring buffer)
 733     (mml-quote-region (point-min) (point-max))
 734     (goto-char (point-max))))
 735
 736 ;;;
 737 ;;; Transforming MIME to MML
 738 ;;;
 739
 740 (defun mime-to-mml (&optional handles)
 741   "Translate the current buffer (which should be a message) into MML.
 742 If HANDLES is non-nil, use it instead reparsing the buffer."
 743   ;; First decode the head.
 744   (save-restriction
 745     (message-narrow-to-head)
 746     (let ((rfc2047-quote-decoded-words-containing-tspecials t))
 747       (mail-decode-encoded-word-region (point-min) (point-max))))
 748   (unless handles
 749     (setq handles (mm-dissect-buffer t)))
 750   (goto-char (point-min))
 751   (search-forward "\n\n" nil t)
 752   (delete-region (point) (point-max))
 753   (if (stringp (car handles))
 754       (mml-insert-mime handles)
 755     (mml-insert-mime handles t))
 756   (mm-destroy-parts handles)
 757   (save-restriction
 758     (message-narrow-to-head)
 759     ;; Remove them, they are confusing.
 760     (message-remove-header "Content-Type")
 761     (message-remove-header "MIME-Version")
 762     (message-remove-header "Content-Disposition")
 763     (message-remove-header "Content-Transfer-Encoding")))
 764
 765 (defun mml-to-mime ()
 766   "Translate the current buffer from MML to MIME."
 767   (message-encode-message-body)
 768   (save-restriction
 769     (message-narrow-to-headers-or-head)
 770     ;; Skip past any From_ headers.
 771     (while (looking-at "From ")
 772       (forward-line 1))
 773     (let ((mail-parse-charset message-default-charset))
 774       (mail-encode-encoded-word-buffer))))
 775
 776 (defun mml-insert-mime (handle &optional no-markup)
 777   (let (textp buffer mmlp)
 778     ;; Determine type and stuff.
 779     (unless (stringp (car handle))
 780       (unless (setq textp (equal (mm-handle-media-supertype handle) "text"))
 781         (save-excursion
 782           (set-buffer (setq buffer (mml-generate-new-buffer " *mml*")))
 783           (mm-insert-part handle)
 784           (if (setq mmlp (equal (mm-handle-media-type handle)
 785                                 "message/rfc822"))
 786               (mime-to-mml)))))
 787     (if mmlp
 788         (mml-insert-mml-markup handle nil t t)
 789       (unless (and no-markup
 790                    (equal (mm-handle-media-type handle) "text/plain"))
 791         (mml-insert-mml-markup handle buffer textp)))
 792     (cond
 793      (mmlp
 794       (insert-buffer-substring buffer)
 795       (goto-char (point-max))
 796       (insert "<#/mml>\n"))
 797      ((stringp (car handle))
 798       (mapcar 'mml-insert-mime (cdr handle))
 799       (insert "<#/multipart>\n"))
 800      (textp
 801       (let ((charset (mail-content-type-get
 802                       (mm-handle-type handle) 'charset))
 803             (start (point)))
 804         (if (eq charset 'gnus-decoded)
 805             (mm-insert-part handle)
 806           (insert (mm-decode-string (mm-get-part handle) charset)))
 807         (mml-quote-region start (point)))
 808       (goto-char (point-max)))
 809      (t
 810       (insert "<#/part>\n")))))
 811
 812 (defun mml-insert-mml-markup (handle &optional buffer nofile mmlp)
 813   "Take a MIME handle and insert an MML tag."
 814   (if (stringp (car handle))
 815       (progn
 816         (insert "<#multipart type=" (mm-handle-media-subtype handle))
 817         (let ((start (mm-handle-multipart-ctl-parameter handle 'start)))
 818           (when start
 819             (insert " start=\"" start "\"")))
 820         (insert ">\n"))
 821     (if mmlp
 822         (insert "<#mml type=" (mm-handle-media-type handle))
 823       (insert "<#part type=" (mm-handle-media-type handle)))
 824     (dolist (elem (append (cdr (mm-handle-type handle))
 825                           (cdr (mm-handle-disposition handle))))
 826       (unless (symbolp (cdr elem))
 827         (insert " " (symbol-name (car elem)) "=\"" (cdr elem) "\"")))
 828     (when (mm-handle-id handle)
 829       (insert " id=\"" (mm-handle-id handle) "\""))
 830     (when (mm-handle-disposition handle)
 831       (insert " disposition=" (car (mm-handle-disposition handle))))
 832     (when buffer
 833       (insert " buffer=\"" (buffer-name buffer) "\""))
 834     (when nofile
 835       (insert " nofile=yes"))
 836     (when (mm-handle-description handle)
 837       (insert " description=\"" (mm-handle-description handle) "\""))
 838     (insert ">\n")))
 839
 840 (defun mml-insert-parameter (&rest parameters)
 841   "Insert PARAMETERS in a nice way."
 842   (dolist (param parameters)
 843     (insert ";")
 844     (let ((point (point)))
 845       (insert " " param)
 846       (when (> (current-column) 71)
 847         (goto-char point)
 848         (insert "\n ")
 849         (end-of-line)))))
 850
 851 ;;;
 852 ;;; Mode for inserting and editing MML forms
 853 ;;;
 854
 855 (defvar mml-mode-map
 856   (let ((sign (make-sparse-keymap))
 857         (encrypt (make-sparse-keymap))
 858         (signpart (make-sparse-keymap))
 859         (encryptpart (make-sparse-keymap))
 860         (map (make-sparse-keymap))
 861         (main (make-sparse-keymap)))
 862     (define-key sign "p" 'mml-secure-message-sign-pgpmime)
 863     (define-key sign "o" 'mml-secure-message-sign-pgp)
 864     (define-key sign "s" 'mml-secure-message-sign-smime)
 865     (define-key signpart "p" 'mml-secure-sign-pgpmime)
 866     (define-key signpart "o" 'mml-secure-sign-pgp)
 867     (define-key signpart "s" 'mml-secure-sign-smime)
 868     (define-key encrypt "p" 'mml-secure-message-encrypt-pgpmime)
 869     (define-key encrypt "o" 'mml-secure-message-encrypt-pgp)
 870     (define-key encrypt "s" 'mml-secure-message-encrypt-smime)
 871     (define-key encryptpart "p" 'mml-secure-encrypt-pgpmime)
 872     (define-key encryptpart "o" 'mml-secure-encrypt-pgp)
 873     (define-key encryptpart "s" 'mml-secure-encrypt-smime)
 874     (define-key map "\C-n" 'mml-unsecure-message)
 875     (define-key map "f" 'mml-attach-file)
 876     (define-key map "b" 'mml-attach-buffer)
 877     (define-key map "e" 'mml-attach-external)
 878     (define-key map "q" 'mml-quote-region)
 879     (define-key map "m" 'mml-insert-multipart)
 880     (define-key map "p" 'mml-insert-part)
 881     (define-key map "v" 'mml-validate)
 882     (define-key map "P" 'mml-preview)
 883     (define-key map "s" sign)
 884     (define-key map "S" signpart)
 885     (define-key map "c" encrypt)
 886     (define-key map "C" encryptpart)
 887     ;;(define-key map "n" 'mml-narrow-to-part)
 888     ;; `M-m' conflicts with `back-to-indentation'.
 889     ;; (define-key main "\M-m" map)
 890     (define-key main "\C-c\C-m" map)
 891     main))
 892
 893 (easy-menu-define
 894   mml-menu mml-mode-map ""
 895   `("Attachments"
 896     ["Attach File..." mml-attach-file
 897      ,@(if (featurep 'xemacs) '(t)
 898          '(:help "Attach a file at point"))]
 899     ["Attach Buffer..." mml-attach-buffer t]
 900     ["Attach External..." mml-attach-external t]
 901     ["Insert Part..." mml-insert-part t]
 902     ["Insert Multipart..." mml-insert-multipart t]
 903     ["PGP/MIME Sign" mml-secure-message-sign-pgpmime t]
 904     ["PGP/MIME Encrypt" mml-secure-message-encrypt-pgpmime t]
 905     ["PGP Sign" mml-secure-message-sign-pgp t]
 906     ["PGP Encrypt" mml-secure-message-encrypt-pgp t]
 907     ["S/MIME Sign" mml-secure-message-sign-smime t]
 908     ["S/MIME Encrypt" mml-secure-message-encrypt-smime t]
 909     ("Secure MIME part"
 910      ["PGP/MIME Sign Part" mml-secure-sign-pgpmime t]
 911      ["PGP/MIME Encrypt Part" mml-secure-encrypt-pgpmime t]
 912      ["PGP Sign Part" mml-secure-sign-pgp t]
 913      ["PGP Encrypt Part" mml-secure-encrypt-pgp t]
 914      ["S/MIME Sign Part" mml-secure-sign-smime t]
 915      ["S/MIME Encrypt Part" mml-secure-encrypt-smime t])
 916     ["Encrypt/Sign off" mml-unsecure-message t]
 917     ;;["Narrow" mml-narrow-to-part t]
 918     ["Quote MML" mml-quote-region t]
 919     ["Validate MML" mml-validate t]
 920     ["Preview" mml-preview t]))
 921
 922 (defvar mml-mode nil
 923   "Minor mode for editing MML.")
 924
 925 (defun mml-mode (&optional arg)
 926   "Minor mode for editing MML.
 927 MML is the MIME Meta Language, a minor mode for composing MIME articles.
 928 See Info node `(emacs-mime)Composing'.
 929
 930 \\{mml-mode-map}"
 931   (interactive "P")
 932   (when (set (make-local-variable 'mml-mode)
 933              (if (null arg) (not mml-mode)
 934                (> (prefix-numeric-value arg) 0)))
 935     (gnus-add-minor-mode 'mml-mode " MML" mml-mode-map)
 936     (easy-menu-add mml-menu mml-mode-map)
 937     (run-hooks 'mml-mode-hook)))
 938
 939 ;;;
 940 ;;; Helper functions for reading MIME stuff from the minibuffer and
 941 ;;; inserting stuff to the buffer.
 942 ;;;
 943
 944 (defun mml-minibuffer-read-file (prompt)
 945   (let* ((completion-ignored-extensions nil)
 946          (file (read-file-name prompt nil nil t)))
 947     ;; Prevent some common errors.  This is inspired by similar code in
 948     ;; VM.
 949     (when (file-directory-p file)
 950       (error "%s is a directory, cannot attach" file))
 951     (unless (file-exists-p file)
 952       (error "No such file: %s" file))
 953     (unless (file-readable-p file)
 954       (error "Permission denied: %s" file))
 955     file))
 956
 957 (defun mml-minibuffer-read-type (name &optional default)
 958   (mailcap-parse-mimetypes)
 959   (let* ((default (or default
 960                       (mm-default-file-encoding name)
 961                       ;; Perhaps here we should check what the file
 962                       ;; looks like, and offer text/plain if it looks
 963                       ;; like text/plain.
 964                       "application/octet-stream"))
 965          (string (completing-read
 966                   (format "Content type (default %s): " default)
 967                   (mapcar 'list (mailcap-mime-types)))))
 968     (if (not (equal string ""))
 969         string
 970       default)))
 971
 972 (defun mml-minibuffer-read-description ()
 973   (let ((description (read-string "One line description: ")))
 974     (when (string-match "\\`[ \t]*\\'" description)
 975       (setq description nil))
 976     description))
 977
 978 (defun mml-minibuffer-read-disposition (type &optional default)
 979   (unless default (setq default
 980                         (if (and (string-match "\\`text/" type)
 981                                  (not (string-match "\\`text/rtf\\'" type)))
 982                             "inline"
 983                           "attachment")))
 984   (let ((disposition (completing-read
 985                       (format "Disposition (default %s): " default)
 986                       '(("attachment") ("inline") (""))
 987                       nil t nil nil default)))
 988     (if (not (equal disposition ""))
 989         disposition
 990       default)))
 991
 992 (defun mml-quote-region (beg end)
 993   "Quote the MML tags in the region."
 994   (interactive "r")
 995   (save-excursion
 996     (save-restriction
 997       ;; Temporarily narrow the region to defend from changes
 998       ;; invalidating END.
 999       (narrow-to-region beg end)
1000       (goto-char (point-min))
1001       ;; Quote parts.
1002       (while (re-search-forward
1003               "<#!*/?\\(multipart\\|part\\|external\\|mml\\)" nil t)
1004         ;; Insert ! after the #.
1005         (goto-char (+ (match-beginning 0) 2))
1006         (insert "!")))))
1007
1008 (defun mml-insert-tag (name &rest plist)
1009   "Insert an MML tag described by NAME and PLIST."
1010   (when (symbolp name)
1011     (setq name (symbol-name name)))
1012   (insert "<#" name)
1013   (while plist
1014     (let ((key (pop plist))
1015           (value (pop plist)))
1016       (when value
1017         ;; Quote VALUE if it contains suspicious characters.
1018         (when (string-match "[\"'\\~/*;() \t\n]" value)
1019           (setq value (with-output-to-string
1020                         (let (print-escape-nonascii)
1021                           (prin1 value)))))
1022         (insert (format " %s=%s" key value)))))
1023   (insert ">\n"))
1024
1025 (defun mml-insert-empty-tag (name &rest plist)
1026   "Insert an empty MML tag described by NAME and PLIST."
1027   (when (symbolp name)
1028     (setq name (symbol-name name)))
1029   (apply #'mml-insert-tag name plist)
1030   (insert "<#/" name ">\n"))
1031
1032 ;;; Attachment functions.
1033
1034 (defun mml-attach-file (file &optional type description disposition)
1035   "Attach a file to the outgoing MIME message.
1036 The file is not inserted or encoded until you send the message with
1037 `\\[message-send-and-exit]' or `\\[message-send]'.
1038
1039 FILE is the name of the file to attach.  TYPE is its content-type, a
1040 string of the form \"type/subtype\".  DESCRIPTION is a one-line
1041 description of the attachment."
1042   (interactive
1043    (let* ((file (mml-minibuffer-read-file "Attach file: "))
1044           (type (mml-minibuffer-read-type file))
1045           (description (mml-minibuffer-read-description))
1046           (disposition (mml-minibuffer-read-disposition type)))
1047      (list file type description disposition)))
1048   (mml-insert-empty-tag 'part
1049                         'type type
1050                         'filename file
1051                         'disposition (or disposition "attachment")
1052                         'description description))
1053
1054 (defun mml-attach-buffer (buffer &optional type description)
1055   "Attach a buffer to the outgoing MIME message.
1056 See `mml-attach-file' for details of operation."
1057   (interactive
1058    (let* ((buffer (read-buffer "Attach buffer: "))
1059           (type (mml-minibuffer-read-type buffer "text/plain"))
1060           (description (mml-minibuffer-read-description)))
1061      (list buffer type description)))
1062   (mml-insert-empty-tag 'part 'type type 'buffer buffer
1063                         'disposition "attachment" 'description description))
1064
1065 (defun mml-attach-external (file &optional type description)
1066   "Attach an external file into the buffer.
1067 FILE is an ange-ftp/efs specification of the part location.
1068 TYPE is the MIME type to use."
1069   (interactive
1070    (let* ((file (mml-minibuffer-read-file "Attach external file: "))
1071           (type (mml-minibuffer-read-type file))
1072           (description (mml-minibuffer-read-description)))
1073      (list file type description)))
1074   (mml-insert-empty-tag 'external 'type type 'name file
1075                         'disposition "attachment" 'description description))
1076
1077 (defun mml-insert-multipart (&optional type)
1078   (interactive (list (completing-read "Multipart type (default mixed): "
1079                                       '(("mixed") ("alternative") ("digest") ("parallel")
1080                                         ("signed") ("encrypted"))
1081                                       nil nil "mixed")))
1082   (or type
1083       (setq type "mixed"))
1084   (mml-insert-empty-tag "multipart" 'type type)
1085   (forward-line -1))
1086
1087 (defun mml-insert-part (&optional type)
1088   (interactive
1089    (list (mml-minibuffer-read-type "")))
1090   (mml-insert-tag 'part 'type type 'disposition "inline")
1091   (forward-line -1))
1092
1093 (defun mml-preview-insert-mail-followup-to ()
1094   "Insert a Mail-Followup-To header before previewing an article.
1095 Should be adopted if code in `message-send-mail' is changed."
1096   (when (and (message-mail-p)
1097              (message-subscribed-p)
1098              (not (mail-fetch-field "mail-followup-to"))
1099              (message-make-mail-followup-to))
1100     (message-position-on-field "Mail-Followup-To" "X-Draft-From")
1101     (insert (message-make-mail-followup-to))))
1102
1103 (defun mml-preview (&optional raw)
1104   "Display current buffer with Gnus, in a new buffer.
1105 If RAW, display a raw encoded MIME message."
1106   (interactive "P")
1107   (save-excursion
1108     (let* ((buf (current-buffer))
1109            (message-options message-options)
1110            (message-this-is-mail (message-mail-p))
1111            (message-this-is-news (message-news-p))
1112            (message-posting-charset (or (gnus-setup-posting-charset
1113                                          (save-restriction
1114                                            (message-narrow-to-headers-or-head)
1115                                            (message-fetch-field "Newsgroups")))
1116                                         message-posting-charset)))
1117       (message-options-set-recipient)
1118       (pop-to-buffer (generate-new-buffer
1119                       (concat (if raw "*Raw MIME preview of "
1120                                 "*MIME preview of ") (buffer-name))))
1121       (when (boundp 'gnus-buffers)
1122         (push (current-buffer) gnus-buffers))
1123       (erase-buffer)
1124       (insert-buffer-substring buf)
1125       (mml-preview-insert-mail-followup-to)
1126       (let ((message-deletable-headers (if (message-news-p)
1127                                            nil
1128                                          message-deletable-headers)))
1129         (message-generate-headers
1130          (copy-sequence (if (message-news-p)
1131                             message-required-news-headers
1132                           message-required-mail-headers))))
1133       (if (re-search-forward
1134            (concat "^" (regexp-quote mail-header-separator) "\n") nil t)
1135           (replace-match "\n"))
1136       (let ((mail-header-separator ""));; mail-header-separator is removed.
1137         (mml-to-mime))
1138       (if raw
1139           (when (fboundp 'set-buffer-multibyte)
1140             (let ((s (buffer-string)))
1141               ;; Insert the content into unibyte buffer.
1142               (erase-buffer)
1143               (mm-disable-multibyte)
1144               (insert s)))
1145         (let ((gnus-newsgroup-charset (car message-posting-charset))
1146               gnus-article-prepare-hook gnus-original-article-buffer)
1147           (run-hooks 'gnus-article-decode-hook)
1148           (let ((gnus-newsgroup-name "dummy")
1149                 (gnus-newsrc-hashtb (or gnus-newsrc-hashtb
1150                                         (gnus-make-hashtable 5))))
1151             (gnus-article-prepare-display))))
1152       ;; Disable article-mode-map.
1153       (use-local-map nil)
1154       (gnus-make-local-hook 'kill-buffer-hook)
1155       (add-hook 'kill-buffer-hook
1156                 (lambda ()
1157                   (mm-destroy-parts gnus-article-mime-handles)) nil t)
1158       (setq buffer-read-only t)
1159       (local-set-key "q" (lambda () (interactive) (kill-buffer nil)))
1160       (local-set-key "=" (lambda () (interactive) (delete-other-windows)))
1161       (local-set-key "\r"
1162                      (lambda ()
1163                        (interactive)
1164                        (widget-button-press (point))))
1165       (local-set-key gnus-mouse-2
1166                      (lambda (event)
1167                        (interactive "@e")
1168                        (widget-button-press (widget-event-point event) event)))
1169       (goto-char (point-min)))))
1170
1171 (defun mml-validate ()
1172   "Validate the current MML document."
1173   (interactive)
1174   (mml-parse))
1175
1176 (defun mml-tweak-part (cont)
1177   "Tweak a MML part."
1178   (let ((tweak (cdr (assq 'tweak cont)))
1179         func)
1180     (cond
1181      (tweak
1182       (setq func
1183             (or (cdr (assoc tweak mml-tweak-function-alist))
1184                 (intern tweak))))
1185      (mml-tweak-type-alist
1186       (let ((alist mml-tweak-type-alist)
1187             (type (or (cdr (assq 'type cont)) "text/plain")))
1188         (while alist
1189           (if (string-match (caar alist) type)
1190               (setq func (cdar alist)
1191                     alist nil)
1192             (setq alist (cdr alist)))))))
1193     (if func
1194         (funcall func cont)
1195       cont)
1196     (let ((alist mml-tweak-sexp-alist))
1197       (while alist
1198         (if (eval (caar alist))
1199             (funcall (cdar alist) cont))
1200         (setq alist (cdr alist)))))
1201   cont)
1202
1203 (defun mml-tweak-externalize-attachments (cont)
1204   "Tweak attached files as external parts."
1205   (let (filename-cons)
1206     (when (and (eq (car cont) 'part)
1207                (not (cdr (assq 'buffer cont)))
1208                (and (setq filename-cons (assq 'filename cont))
1209                     (not (equal (cdr (assq 'nofile cont)) "yes"))))
1210       (setcar cont 'external)
1211       (setcar filename-cons 'name))))
1212
1213 (provide 'mml)
1214
1215 ;;; arch-tag: 583c96cf-1ffe-451b-a5e5-4733ae9ddd12
1216 ;;; mml.el ends here