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
   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., 59 Temple Place - Suite 330,
  21 ;; Boston, MA 02111-1307, 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 "21.4"
  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 "21.4"
  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 "21.4"
  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
 128 (defvar mml-buffer-list nil)
 129
 130 (defun mml-generate-new-buffer (name)
 131   (let ((buf (generate-new-buffer name)))
 132     (push buf mml-buffer-list)
 133     buf))
 134
 135 (defun mml-destroy-buffers ()
 136   (let (kill-buffer-hook)
 137     (mapcar 'kill-buffer mml-buffer-list)
 138     (setq mml-buffer-list nil)))
 139
 140 (defun mml-parse ()
 141   "Parse the current buffer as an MML document."
 142   (save-excursion
 143     (goto-char (point-min))
 144     (let ((table (syntax-table)))
 145       (unwind-protect
 146           (progn
 147             (set-syntax-table mml-syntax-table)
 148             (mml-parse-1))
 149         (set-syntax-table table)))))
 150
 151 (defun mml-parse-1 ()
 152   "Parse the current buffer as an MML document."
 153   (let (struct tag point contents charsets warn use-ascii no-markup-p raw)
 154     (while (and (not (eobp))
 155                 (not (looking-at "<#/multipart")))
 156       (cond
 157        ((looking-at "<#secure")
 158         ;; The secure part is essentially a meta-meta tag, which
 159         ;; expands to either a part tag if there are no other parts in
 160         ;; the document or a multipart tag if there are other parts
 161         ;; included in the message
 162         (let* (secure-mode
 163                (taginfo (mml-read-tag))
 164                (recipients (cdr (assq 'recipients taginfo)))
 165                (sender (cdr (assq 'sender taginfo)))
 166                (location (cdr (assq 'tag-location taginfo)))
 167                (mode (cdr (assq 'mode taginfo)))
 168                (method (cdr (assq 'method taginfo)))
 169                tags)
 170           (save-excursion
 171             (if
 172                 (re-search-forward
 173                  "<#\\(/\\)?\\(multipart\\|part\\|external\\|mml\\)." nil t)
 174                 (setq secure-mode "multipart")
 175               (setq secure-mode "part")))
 176           (save-excursion
 177             (goto-char location)
 178             (re-search-forward "<#secure[^\n]*>\n"))
 179           (delete-region (match-beginning 0) (match-end 0))
 180           (cond ((string= mode "sign")
 181                  (setq tags (list "sign" method)))
 182                 ((string= mode "encrypt")
 183                  (setq tags (list "encrypt" method)))
 184                 ((string= mode "signencrypt")
 185                  (setq tags (list "sign" method "encrypt" method))))
 186           (eval `(mml-insert-tag ,secure-mode
 187                                  ,@tags
 188                                  ,(if recipients "recipients")
 189                                  ,recipients
 190                                  ,(if sender "sender")
 191                                  ,sender))
 192           ;; restart the parse
 193           (goto-char location)))
 194        ((looking-at "<#multipart")
 195         (push (nconc (mml-read-tag) (mml-parse-1)) struct))
 196        ((looking-at "<#external")
 197         (push (nconc (mml-read-tag) (list (cons 'contents (mml-read-part))))
 198               struct))
 199        (t
 200         (if (or (looking-at "<#part") (looking-at "<#mml"))
 201             (setq tag (mml-read-tag)
 202                   no-markup-p nil
 203                   warn nil)
 204           (setq tag (list 'part '(type . "text/plain"))
 205                 no-markup-p t
 206                 warn t))
 207         (setq raw (cdr (assq 'raw tag))
 208               point (point)
 209               contents (mml-read-part (eq 'mml (car tag)))
 210               charsets (cond
 211                         (raw nil)
 212                         ((assq 'charset tag)
 213                          (list
 214                           (intern (downcase (cdr (assq 'charset tag))))))
 215                         (t
 216                          (mm-find-mime-charset-region point (point)))))
 217         (when (and (not raw) (memq nil charsets))
 218           (if (or (memq 'unknown-encoding mml-confirmation-set)
 219                   (message-options-get 'unknown-encoding)
 220                   (and (y-or-n-p "\
 221 Message contains characters with unknown encoding.  Really send? ")
 222                        (message-options-set 'unknown-encoding t)))
 223               (if (setq use-ascii
 224                         (or (memq 'use-ascii mml-confirmation-set)
 225                             (message-options-get 'use-ascii)
 226                             (and (y-or-n-p "Use ASCII as charset? ")
 227                                  (message-options-set 'use-ascii t))))
 228                   (setq charsets (delq nil charsets))
 229                 (setq warn nil))
 230             (error "Edit your message to remove those characters")))
 231         (if (or raw
 232                 (eq 'mml (car tag))
 233                 (< (length charsets) 2))
 234             (if (or (not no-markup-p)
 235                     (string-match "[^ \t\r\n]" contents))
 236                 ;; Don't create blank parts.
 237                 (push (nconc tag (list (cons 'contents contents)))
 238                       struct))
 239           (let ((nstruct (mml-parse-singlepart-with-multiple-charsets
 240                           tag point (point) use-ascii)))
 241             (when (and warn
 242                        (not (memq 'multipart mml-confirmation-set))
 243                        (not (message-options-get 'multipart))
 244                        (not (and (y-or-n-p (format "\
 245 A message part needs to be split into %d charset parts.  Really send? "
 246                                                    (length nstruct)))
 247                                  (message-options-set 'multipart t))))
 248               (error "Edit your message to use only one charset"))
 249             (setq struct (nconc nstruct struct)))))))
 250     (unless (eobp)
 251       (forward-line 1))
 252     (nreverse struct)))
 253
 254 (defun mml-parse-singlepart-with-multiple-charsets
 255   (orig-tag beg end &optional use-ascii)
 256   (save-excursion
 257     (save-restriction
 258       (narrow-to-region beg end)
 259       (goto-char (point-min))
 260       (let ((current (or (mm-mime-charset (mm-charset-after))
 261                          (and use-ascii 'us-ascii)))
 262             charset struct space newline paragraph)
 263         (while (not (eobp))
 264           (setq charset (mm-mime-charset (mm-charset-after)))
 265           (cond
 266            ;; The charset remains the same.
 267            ((eq charset 'us-ascii))
 268            ((or (and use-ascii (not charset))
 269                 (eq charset current))
 270             (setq space nil
 271                   newline nil
 272                   paragraph nil))
 273            ;; The initial charset was ascii.
 274            ((eq current 'us-ascii)
 275             (setq current charset
 276                   space nil
 277                   newline nil
 278                   paragraph nil))
 279            ;; We have a change in charsets.
 280            (t
 281             (push (append
 282                    orig-tag
 283                    (list (cons 'contents
 284                                (buffer-substring-no-properties
 285                                 beg (or paragraph newline space (point))))))
 286                   struct)
 287             (setq beg (or paragraph newline space (point))
 288                   current charset
 289                   space nil
 290                   newline nil
 291                   paragraph nil)))
 292           ;; Compute places where it might be nice to break the part.
 293           (cond
 294            ((memq (following-char) '(?  ?\t))
 295             (setq space (1+ (point))))
 296            ((and (eq (following-char) ?\n)
 297                  (not (bobp))
 298                  (eq (char-after (1- (point))) ?\n))
 299             (setq paragraph (point)))
 300            ((eq (following-char) ?\n)
 301             (setq newline (1+ (point)))))
 302           (forward-char 1))
 303         ;; Do the final part.
 304         (unless (= beg (point))
 305           (push (append orig-tag
 306                         (list (cons 'contents
 307                                     (buffer-substring-no-properties
 308                                      beg (point)))))
 309                 struct))
 310         struct))))
 311
 312 (defun mml-read-tag ()
 313   "Read a tag and return the contents."
 314   (let ((orig-point (point))
 315         contents name elem val)
 316     (forward-char 2)
 317     (setq name (buffer-substring-no-properties
 318                 (point) (progn (forward-sexp 1) (point))))
 319     (skip-chars-forward " \t\n")
 320     (while (not (looking-at ">[ \t]*\n?"))
 321       (setq elem (buffer-substring-no-properties
 322                   (point) (progn (forward-sexp 1) (point))))
 323       (skip-chars-forward "= \t\n")
 324       (setq val (buffer-substring-no-properties
 325                  (point) (progn (forward-sexp 1) (point))))
 326       (when (string-match "^\"\\(.*\\)\"$" val)
 327         (setq val (match-string 1 val)))
 328       (push (cons (intern elem) val) contents)
 329       (skip-chars-forward " \t\n"))
 330     (goto-char (match-end 0))
 331     ;; Don't skip the leading space.
 332     ;;(skip-chars-forward " \t\n")
 333     ;; Put the tag location into the returned contents
 334     (setq contents (append (list (cons 'tag-location orig-point)) contents))
 335     (cons (intern name) (nreverse contents))))
 336
 337 (defun mml-buffer-substring-no-properties-except-hard-newlines (start end)
 338   (let ((str (buffer-substring-no-properties start end))
 339         (bufstart start) tmp)
 340     (while (setq tmp (text-property-any start end 'hard 't))
 341       (set-text-properties (- tmp bufstart) (- tmp bufstart -1)
 342                            '(hard t) str)
 343       (setq start (1+ tmp)))
 344     str))
 345
 346 (defun mml-read-part (&optional mml)
 347   "Return the buffer up till the next part, multipart or closing part or multipart.
 348 If MML is non-nil, return the buffer up till the correspondent mml tag."
 349   (let ((beg (point)) (count 1))
 350     ;; If the tag ended at the end of the line, we go to the next line.
 351     (when (looking-at "[ \t]*\n")
 352       (forward-line 1))
 353     (if mml
 354         (progn
 355           (while (and (> count 0) (not (eobp)))
 356             (if (re-search-forward "<#\\(/\\)?mml." nil t)
 357                 (setq count (+ count (if (match-beginning 1) -1 1)))
 358               (goto-char (point-max))))
 359           (mml-buffer-substring-no-properties-except-hard-newlines
 360            beg (if (> count 0)
 361                    (point)
 362                  (match-beginning 0))))
 363       (if (re-search-forward
 364            "<#\\(/\\)?\\(multipart\\|part\\|external\\|mml\\)." nil t)
 365           (prog1
 366               (mml-buffer-substring-no-properties-except-hard-newlines
 367                beg (match-beginning 0))
 368             (if (or (not (match-beginning 1))
 369                     (equal (match-string 2) "multipart"))
 370                 (goto-char (match-beginning 0))
 371               (when (looking-at "[ \t]*\n")
 372                 (forward-line 1))))
 373         (mml-buffer-substring-no-properties-except-hard-newlines
 374          beg (goto-char (point-max)))))))
 375
 376 (defvar mml-boundary nil)
 377 (defvar mml-base-boundary "-=-=")
 378 (defvar mml-multipart-number 0)
 379
 380 (defun mml-generate-mime ()
 381   "Generate a MIME message based on the current MML document."
 382   (let ((cont (mml-parse))
 383         (mml-multipart-number mml-multipart-number))
 384     (if (not cont)
 385         nil
 386       (with-temp-buffer
 387         (if (and (consp (car cont))
 388                  (= (length cont) 1))
 389             (mml-generate-mime-1 (car cont))
 390           (mml-generate-mime-1 (nconc (list 'multipart '(type . "mixed"))
 391                                       cont)))
 392         (buffer-string)))))
 393
 394 (defun mml-generate-mime-1 (cont)
 395   (let ((mm-use-ultra-safe-encoding
 396          (or mm-use-ultra-safe-encoding (assq 'sign cont))))
 397     (save-restriction
 398       (narrow-to-region (point) (point))
 399       (mml-tweak-part cont)
 400       (cond
 401        ((or (eq (car cont) 'part) (eq (car cont) 'mml))
 402         (let ((raw (cdr (assq 'raw cont)))
 403               coded encoding charset filename type flowed)
 404           (setq type (or (cdr (assq 'type cont)) "text/plain"))
 405           (if (and (not raw)
 406                    (member (car (split-string type "/")) '("text" "message")))
 407               (progn
 408                 (with-temp-buffer
 409                   (setq charset (mm-charset-to-coding-system
 410                                  (cdr (assq 'charset cont))))
 411                   (when (eq charset 'ascii)
 412                     (setq charset nil))
 413                   (cond
 414                    ((cdr (assq 'buffer cont))
 415                     (insert-buffer-substring (cdr (assq 'buffer cont))))
 416                    ((and (setq filename (cdr (assq 'filename cont)))
 417                          (not (equal (cdr (assq 'nofile cont)) "yes")))
 418                     (let ((coding-system-for-read charset))
 419                       (mm-insert-file-contents filename)))
 420                    ((eq 'mml (car cont))
 421                     (insert (cdr (assq 'contents cont))))
 422                    (t
 423                     (save-restriction
 424                       (narrow-to-region (point) (point))
 425                       (insert (cdr (assq 'contents cont)))
 426                       ;; Remove quotes from quoted tags.
 427                       (goto-char (point-min))
 428                       (while (re-search-forward
 429                               "<#!+/?\\(part\\|multipart\\|external\\|mml\\)"
 430                               nil t)
 431                         (delete-region (+ (match-beginning 0) 2)
 432                                        (+ (match-beginning 0) 3))))))
 433                   (cond
 434                    ((eq (car cont) 'mml)
 435                     (let ((mml-boundary (mml-compute-boundary cont))
 436                           (mml-generate-default-type "text/plain"))
 437                       (mml-to-mime))
 438                     (let ((mm-7bit-chars (concat mm-7bit-chars "\x1b")))
 439                       ;; ignore 0x1b, it is part of iso-2022-jp
 440                       (setq encoding (mm-body-7-or-8))))
 441                    ((string= (car (split-string type "/")) "message")
 442                     (let ((mm-7bit-chars (concat mm-7bit-chars "\x1b")))
 443                       ;; ignore 0x1b, it is part of iso-2022-jp
 444                       (setq encoding (mm-body-7-or-8))))
 445                    (t
 446                     ;; Only perform format=flowed filling on text/plain
 447                     ;; parts where there either isn't a format parameter
 448                     ;; in the mml tag or it says "flowed" and there
 449                     ;; actually are hard newlines in the text.
 450                     (let (use-hard-newlines)
 451                       (when (and (string= type "text/plain")
 452                                  (or (null (assq 'format cont))
 453                                      (string= (cdr (assq 'format cont))
 454                                               "flowed"))
 455                                  (setq use-hard-newlines
 456                                        (text-property-any
 457                                         (point-min) (point-max) 'hard 't)))
 458                         (fill-flowed-encode)
 459                         ;; Indicate that `mml-insert-mime-headers' should
 460                         ;; insert a "; format=flowed" string unless the
 461                         ;; user has already specified it.
 462                         (setq flowed (null (assq 'format cont)))))
 463                     (setq charset (mm-encode-body charset))
 464                     (setq encoding (mm-body-encoding
 465                                     charset (cdr (assq 'encoding cont))))))
 466                   (setq coded (buffer-string)))
 467                 (mml-insert-mime-headers cont type charset encoding flowed)
 468                 (insert "\n")
 469                 (insert coded))
 470             (mm-with-unibyte-buffer
 471               (cond
 472                ((cdr (assq 'buffer cont))
 473                 (insert-buffer-substring (cdr (assq 'buffer cont))))
 474                ((and (setq filename (cdr (assq 'filename cont)))
 475                      (not (equal (cdr (assq 'nofile cont)) "yes")))
 476                 (let ((coding-system-for-read mm-binary-coding-system))
 477                   (mm-insert-file-contents filename nil nil nil nil t)))
 478                (t
 479                 (insert (cdr (assq 'contents cont)))))
 480               (setq encoding (mm-encode-buffer type)
 481                     coded (mm-string-as-multibyte (buffer-string))))
 482             (mml-insert-mime-headers cont type charset encoding nil)
 483             (insert "\n")
 484             (mm-with-unibyte-current-buffer
 485               (insert coded)))))
 486        ((eq (car cont) 'external)
 487         (insert "Content-Type: message/external-body")
 488         (let ((parameters (mml-parameter-string
 489                            cont '(expiration size permission)))
 490               (name (cdr (assq 'name cont)))
 491               (url (cdr (assq 'url cont))))
 492           (when name
 493             (setq name (mml-parse-file-name name))
 494             (if (stringp name)
 495                 (mml-insert-parameter
 496                  (mail-header-encode-parameter "name" name)
 497                  "access-type=local-file")
 498               (mml-insert-parameter
 499                (mail-header-encode-parameter
 500                 "name" (file-name-nondirectory (nth 2 name)))
 501                (mail-header-encode-parameter "site" (nth 1 name))
 502                (mail-header-encode-parameter
 503                 "directory" (file-name-directory (nth 2 name))))
 504               (mml-insert-parameter
 505                (concat "access-type="
 506                        (if (member (nth 0 name) '("ftp@" "anonymous@"))
 507                            "anon-ftp"
 508                          "ftp")))))
 509           (when url
 510             (mml-insert-parameter
 511              (mail-header-encode-parameter "url" url)
 512              "access-type=url"))
 513           (when parameters
 514             (mml-insert-parameter-string
 515              cont '(expiration size permission))))
 516         (insert "\n\n")
 517         (insert "Content-Type: " (cdr (assq 'type cont)) "\n")
 518         (insert "Content-ID: " (message-make-message-id) "\n")
 519         (insert "Content-Transfer-Encoding: "
 520                 (or (cdr (assq 'encoding cont)) "binary"))
 521         (insert "\n\n")
 522         (insert (or (cdr (assq 'contents cont))))
 523         (insert "\n"))
 524        ((eq (car cont) 'multipart)
 525         (let* ((type (or (cdr (assq 'type cont)) "mixed"))
 526                (mml-generate-default-type (if (equal type "digest")
 527                                               "message/rfc822"
 528                                             "text/plain"))
 529                (handler (assoc type mml-generate-multipart-alist)))
 530           (if handler
 531               (funcall (cdr handler) cont)
 532             ;; No specific handler.  Use default one.
 533             (let ((mml-boundary (mml-compute-boundary cont)))
 534               (insert (format "Content-Type: multipart/%s; boundary=\"%s\""
 535                               type mml-boundary)
 536                       (if (cdr (assq 'start cont))
 537                           (format "; start=\"%s\"\n" (cdr (assq 'start cont)))
 538                         "\n"))
 539               (let ((cont cont) part)
 540                 (while (setq part (pop cont))
 541                   ;; Skip `multipart' and attributes.
 542                   (when (and (consp part) (consp (cdr part)))
 543                     (insert "\n--" mml-boundary "\n")
 544                     (mml-generate-mime-1 part))))
 545               (insert "\n--" mml-boundary "--\n")))))
 546        (t
 547         (error "Invalid element: %S" cont)))
 548       ;; handle sign & encrypt tags in a semi-smart way.
 549       (let ((sign-item (assoc (cdr (assq 'sign cont)) mml-sign-alist))
 550             (encrypt-item (assoc (cdr (assq 'encrypt cont))
 551                                  mml-encrypt-alist))
 552             sender recipients)
 553         (when (or sign-item encrypt-item)
 554           (when (setq sender (cdr (assq 'sender cont)))
 555             (message-options-set 'mml-sender sender)
 556             (message-options-set 'message-sender sender))
 557           (if (setq recipients (cdr (assq 'recipients cont)))
 558               (message-options-set 'message-recipients recipients))
 559           (let ((style (mml-signencrypt-style (first (or sign-item encrypt-item)))))
 560             ;; check if: we're both signing & encrypting, both methods
 561             ;; are the same (why would they be different?!), and that
 562             ;; the signencrypt style allows for combined operation.
 563             (if (and sign-item encrypt-item (equal (first sign-item)
 564                                                    (first encrypt-item))
 565                      (equal style 'combined))
 566                 (funcall (nth 1 encrypt-item) cont t)
 567               ;; otherwise, revert to the old behavior.
 568               (when sign-item
 569                 (funcall (nth 1 sign-item) cont))
 570               (when encrypt-item
 571                 (funcall (nth 1 encrypt-item) cont)))))))))
 572
 573 (defun mml-compute-boundary (cont)
 574   "Return a unique boundary that does not exist in CONT."
 575   (let ((mml-boundary (funcall mml-boundary-function
 576                                (incf mml-multipart-number))))
 577     ;; This function tries again and again until it has found
 578     ;; a unique boundary.
 579     (while (not (catch 'not-unique
 580                   (mml-compute-boundary-1 cont))))
 581     mml-boundary))
 582
 583 (defun mml-compute-boundary-1 (cont)
 584   (let (filename)
 585     (cond
 586      ((eq (car cont) 'part)
 587       (with-temp-buffer
 588         (cond
 589          ((cdr (assq 'buffer cont))
 590           (insert-buffer-substring (cdr (assq 'buffer cont))))
 591          ((and (setq filename (cdr (assq 'filename cont)))
 592                (not (equal (cdr (assq 'nofile cont)) "yes")))
 593           (mm-insert-file-contents filename))
 594          (t
 595           (insert (cdr (assq 'contents cont)))))
 596         (goto-char (point-min))
 597         (when (re-search-forward (concat "^--" (regexp-quote mml-boundary))
 598                                  nil t)
 599           (setq mml-boundary (funcall mml-boundary-function
 600                                       (incf mml-multipart-number)))
 601           (throw 'not-unique nil))))
 602      ((eq (car cont) 'multipart)
 603       (mapcar 'mml-compute-boundary-1 (cddr cont))))
 604     t))
 605
 606 (defun mml-make-boundary (number)
 607   (concat (make-string (% number 60) ?=)
 608           (if (> number 17)
 609               (format "%x" number)
 610             "")
 611           mml-base-boundary))
 612
 613 (defun mml-insert-mime-headers (cont type charset encoding flowed)
 614   (let (parameters id disposition description)
 615     (setq parameters
 616           (mml-parameter-string
 617            cont mml-content-type-parameters))
 618     (when (or charset
 619               parameters
 620               flowed
 621               (not (equal type mml-generate-default-type))
 622               mml-insert-mime-headers-always)
 623       (when (consp charset)
 624         (error
 625          "Can't encode a part with several charsets"))
 626       (insert "Content-Type: " type)
 627       (when charset
 628         (insert "; " (mail-header-encode-parameter
 629                       "charset" (symbol-name charset))))
 630       (when flowed
 631         (insert "; format=flowed"))
 632       (when parameters
 633         (mml-insert-parameter-string
 634          cont mml-content-type-parameters))
 635       (insert "\n"))
 636     (when (setq id (cdr (assq 'id cont)))
 637       (insert "Content-ID: " id "\n"))
 638     (setq parameters
 639           (mml-parameter-string
 640            cont mml-content-disposition-parameters))
 641     (when (or (setq disposition (cdr (assq 'disposition cont)))
 642               parameters)
 643       (insert "Content-Disposition: " (or disposition "inline"))
 644       (when parameters
 645         (mml-insert-parameter-string
 646          cont mml-content-disposition-parameters))
 647       (insert "\n"))
 648     (unless (eq encoding '7bit)
 649       (insert (format "Content-Transfer-Encoding: %s\n" encoding)))
 650     (when (setq description (cdr (assq 'description cont)))
 651       (insert "Content-Description: "
 652               (mail-encode-encoded-word-string description) "\n"))))
 653
 654 (defun mml-parameter-string (cont types)
 655   (let ((string "")
 656         value type)
 657     (while (setq type (pop types))
 658       (when (setq value (cdr (assq type cont)))
 659         ;; Strip directory component from the filename parameter.
 660         (when (eq type 'filename)
 661           (setq value (file-name-nondirectory value)))
 662         (setq string (concat string "; "
 663                              (mail-header-encode-parameter
 664                               (symbol-name type) value)))))
 665     (when (not (zerop (length string)))
 666       string)))
 667
 668 (defun mml-insert-parameter-string (cont types)
 669   (let (value type)
 670     (while (setq type (pop types))
 671       (when (setq value (cdr (assq type cont)))
 672         ;; Strip directory component from the filename parameter.
 673         (when (eq type 'filename)
 674           (setq value (file-name-nondirectory value)))
 675         (mml-insert-parameter
 676          (mail-header-encode-parameter
 677           (symbol-name type) value))))))
 678
 679 (eval-when-compile
 680   (defvar ange-ftp-name-format)
 681   (defvar efs-path-regexp))
 682 (defun mml-parse-file-name (path)
 683   (if (if (boundp 'efs-path-regexp)
 684           (string-match efs-path-regexp path)
 685         (if (boundp 'ange-ftp-name-format)
 686             (string-match (car ange-ftp-name-format) path)))
 687       (list (match-string 1 path) (match-string 2 path)
 688             (substring path (1+ (match-end 2))))
 689     path))
 690
 691 (defun mml-insert-buffer (buffer)
 692   "Insert BUFFER at point and quote any MML markup."
 693   (save-restriction
 694     (narrow-to-region (point) (point))
 695     (insert-buffer-substring buffer)
 696     (mml-quote-region (point-min) (point-max))
 697     (goto-char (point-max))))
 698
 699 ;;;
 700 ;;; Transforming MIME to MML
 701 ;;;
 702
 703 (defun mime-to-mml (&optional handles)
 704   "Translate the current buffer (which should be a message) into MML.
 705 If HANDLES is non-nil, use it instead reparsing the buffer."
 706   ;; First decode the head.
 707   (save-restriction
 708     (message-narrow-to-head)
 709     (mail-decode-encoded-word-region (point-min) (point-max)))
 710   (unless handles
 711     (setq handles (mm-dissect-buffer t)))
 712   (goto-char (point-min))
 713   (search-forward "\n\n" nil t)
 714   (delete-region (point) (point-max))
 715   (if (stringp (car handles))
 716       (mml-insert-mime handles)
 717     (mml-insert-mime handles t))
 718   (mm-destroy-parts handles)
 719   (save-restriction
 720     (message-narrow-to-head)
 721     ;; Remove them, they are confusing.
 722     (message-remove-header "Content-Type")
 723     (message-remove-header "MIME-Version")
 724     (message-remove-header "Content-Disposition")
 725     (message-remove-header "Content-Transfer-Encoding")))
 726
 727 (defun mml-to-mime ()
 728   "Translate the current buffer from MML to MIME."
 729   (message-encode-message-body)
 730   (save-restriction
 731     (message-narrow-to-headers-or-head)
 732     ;; Skip past any From_ headers.
 733     (while (looking-at "From ")
 734       (forward-line 1))
 735     (let ((mail-parse-charset message-default-charset))
 736       (mail-encode-encoded-word-buffer))))
 737
 738 (defun mml-insert-mime (handle &optional no-markup)
 739   (let (textp buffer mmlp)
 740     ;; Determine type and stuff.
 741     (unless (stringp (car handle))
 742       (unless (setq textp (equal (mm-handle-media-supertype handle) "text"))
 743         (save-excursion
 744           (set-buffer (setq buffer (mml-generate-new-buffer " *mml*")))
 745           (mm-insert-part handle)
 746           (if (setq mmlp (equal (mm-handle-media-type handle)
 747                                 "message/rfc822"))
 748               (mime-to-mml)))))
 749     (if mmlp
 750         (mml-insert-mml-markup handle nil t t)
 751       (unless (and no-markup
 752                    (equal (mm-handle-media-type handle) "text/plain"))
 753         (mml-insert-mml-markup handle buffer textp)))
 754     (cond
 755      (mmlp
 756       (insert-buffer-substring buffer)
 757       (goto-char (point-max))
 758       (insert "<#/mml>\n"))
 759      ((stringp (car handle))
 760       (mapcar 'mml-insert-mime (cdr handle))
 761       (insert "<#/multipart>\n"))
 762      (textp
 763       (let ((charset (mail-content-type-get
 764                       (mm-handle-type handle) 'charset))
 765             (start (point)))
 766         (if (eq charset 'gnus-decoded)
 767             (mm-insert-part handle)
 768           (insert (mm-decode-string (mm-get-part handle) charset)))
 769         (mml-quote-region start (point)))
 770       (goto-char (point-max)))
 771      (t
 772       (insert "<#/part>\n")))))
 773
 774 (defun mml-insert-mml-markup (handle &optional buffer nofile mmlp)
 775   "Take a MIME handle and insert an MML tag."
 776   (if (stringp (car handle))
 777       (progn
 778         (insert "<#multipart type=" (mm-handle-media-subtype handle))
 779         (let ((start (mm-handle-multipart-ctl-parameter handle 'start)))
 780           (when start
 781             (insert " start=\"" start "\"")))
 782         (insert ">\n"))
 783     (if mmlp
 784         (insert "<#mml type=" (mm-handle-media-type handle))
 785       (insert "<#part type=" (mm-handle-media-type handle)))
 786     (dolist (elem (append (cdr (mm-handle-type handle))
 787                           (cdr (mm-handle-disposition handle))))
 788       (unless (symbolp (cdr elem))
 789         (insert " " (symbol-name (car elem)) "=\"" (cdr elem) "\"")))
 790     (when (mm-handle-id handle)
 791       (insert " id=\"" (mm-handle-id handle) "\""))
 792     (when (mm-handle-disposition handle)
 793       (insert " disposition=" (car (mm-handle-disposition handle))))
 794     (when buffer
 795       (insert " buffer=\"" (buffer-name buffer) "\""))
 796     (when nofile
 797       (insert " nofile=yes"))
 798     (when (mm-handle-description handle)
 799       (insert " description=\"" (mm-handle-description handle) "\""))
 800     (insert ">\n")))
 801
 802 (defun mml-insert-parameter (&rest parameters)
 803   "Insert PARAMETERS in a nice way."
 804   (dolist (param parameters)
 805     (insert ";")
 806     (let ((point (point)))
 807       (insert " " param)
 808       (when (> (current-column) 71)
 809         (goto-char point)
 810         (insert "\n ")
 811         (end-of-line)))))
 812
 813 ;;;
 814 ;;; Mode for inserting and editing MML forms
 815 ;;;
 816
 817 (defvar mml-mode-map
 818   (let ((sign (make-sparse-keymap))
 819         (encrypt (make-sparse-keymap))
 820         (signpart (make-sparse-keymap))
 821         (encryptpart (make-sparse-keymap))
 822         (map (make-sparse-keymap))
 823         (main (make-sparse-keymap)))
 824     (define-key sign "p" 'mml-secure-message-sign-pgpmime)
 825     (define-key sign "o" 'mml-secure-message-sign-pgp)
 826     (define-key sign "s" 'mml-secure-message-sign-smime)
 827     (define-key signpart "p" 'mml-secure-sign-pgpmime)
 828     (define-key signpart "o" 'mml-secure-sign-pgp)
 829     (define-key signpart "s" 'mml-secure-sign-smime)
 830     (define-key encrypt "p" 'mml-secure-message-encrypt-pgpmime)
 831     (define-key encrypt "o" 'mml-secure-message-encrypt-pgp)
 832     (define-key encrypt "s" 'mml-secure-message-encrypt-smime)
 833     (define-key encryptpart "p" 'mml-secure-encrypt-pgpmime)
 834     (define-key encryptpart "o" 'mml-secure-encrypt-pgp)
 835     (define-key encryptpart "s" 'mml-secure-encrypt-smime)
 836     (define-key map "\C-n" 'mml-unsecure-message)
 837     (define-key map "f" 'mml-attach-file)
 838     (define-key map "b" 'mml-attach-buffer)
 839     (define-key map "e" 'mml-attach-external)
 840     (define-key map "q" 'mml-quote-region)
 841     (define-key map "m" 'mml-insert-multipart)
 842     (define-key map "p" 'mml-insert-part)
 843     (define-key map "v" 'mml-validate)
 844     (define-key map "P" 'mml-preview)
 845     (define-key map "s" sign)
 846     (define-key map "S" signpart)
 847     (define-key map "c" encrypt)
 848     (define-key map "C" encryptpart)
 849     ;;(define-key map "n" 'mml-narrow-to-part)
 850     ;; `M-m' conflicts with `back-to-indentation'.
 851     ;; (define-key main "\M-m" map)
 852     (define-key main "\C-c\C-m" map)
 853     main))
 854
 855 (easy-menu-define
 856   mml-menu mml-mode-map ""
 857   `("Attachments"
 858     ["Attach File..." mml-attach-file
 859      ,@(if (featurep 'xemacs) '(t)
 860          '(:help "Attach a file at point"))]
 861     ["Attach Buffer..." mml-attach-buffer t]
 862     ["Attach External..." mml-attach-external t]
 863     ["Insert Part..." mml-insert-part t]
 864     ["Insert Multipart..." mml-insert-multipart t]
 865     ["PGP/MIME Sign" mml-secure-message-sign-pgpmime t]
 866     ["PGP/MIME Encrypt" mml-secure-message-encrypt-pgpmime t]
 867     ["PGP Sign" mml-secure-message-sign-pgp t]
 868     ["PGP Encrypt" mml-secure-message-encrypt-pgp t]
 869     ["S/MIME Sign" mml-secure-message-sign-smime t]
 870     ["S/MIME Encrypt" mml-secure-message-encrypt-smime t]
 871     ("Secure MIME part"
 872      ["PGP/MIME Sign Part" mml-secure-sign-pgpmime t]
 873      ["PGP/MIME Encrypt Part" mml-secure-encrypt-pgpmime t]
 874      ["PGP Sign Part" mml-secure-sign-pgp t]
 875      ["PGP Encrypt Part" mml-secure-encrypt-pgp t]
 876      ["S/MIME Sign Part" mml-secure-sign-smime t]
 877      ["S/MIME Encrypt Part" mml-secure-encrypt-smime t])
 878     ["Encrypt/Sign off" mml-unsecure-message t]
 879     ;;["Narrow" mml-narrow-to-part t]
 880     ["Quote MML" mml-quote-region t]
 881     ["Validate MML" mml-validate t]
 882     ["Preview" mml-preview t]))
 883
 884 (defvar mml-mode nil
 885   "Minor mode for editing MML.")
 886
 887 (defun mml-mode (&optional arg)
 888   "Minor mode for editing MML.
 889 MML is the MIME Meta Language, a minor mode for composing MIME articles.
 890 See Info node `(emacs-mime)Composing'.
 891
 892 \\{mml-mode-map}"
 893   (interactive "P")
 894   (when (set (make-local-variable 'mml-mode)
 895              (if (null arg) (not mml-mode)
 896                (> (prefix-numeric-value arg) 0)))
 897     (gnus-add-minor-mode 'mml-mode " MML" mml-mode-map)
 898     (easy-menu-add mml-menu mml-mode-map)
 899     (run-hooks 'mml-mode-hook)))
 900
 901 ;;;
 902 ;;; Helper functions for reading MIME stuff from the minibuffer and
 903 ;;; inserting stuff to the buffer.
 904 ;;;
 905
 906 (defun mml-minibuffer-read-file (prompt)
 907   (let* ((completion-ignored-extensions nil)
 908          (file (read-file-name prompt nil nil t)))
 909     ;; Prevent some common errors.  This is inspired by similar code in
 910     ;; VM.
 911     (when (file-directory-p file)
 912       (error "%s is a directory, cannot attach" file))
 913     (unless (file-exists-p file)
 914       (error "No such file: %s" file))
 915     (unless (file-readable-p file)
 916       (error "Permission denied: %s" file))
 917     file))
 918
 919 (defun mml-minibuffer-read-type (name &optional default)
 920   (mailcap-parse-mimetypes)
 921   (let* ((default (or default
 922                       (mm-default-file-encoding name)
 923                       ;; Perhaps here we should check what the file
 924                       ;; looks like, and offer text/plain if it looks
 925                       ;; like text/plain.
 926                       "application/octet-stream"))
 927          (string (completing-read
 928                   (format "Content type (default %s): " default)
 929                   (mapcar 'list (mailcap-mime-types)))))
 930     (if (not (equal string ""))
 931         string
 932       default)))
 933
 934 (defun mml-minibuffer-read-description ()
 935   (let ((description (read-string "One line description: ")))
 936     (when (string-match "\\`[ \t]*\\'" description)
 937       (setq description nil))
 938     description))
 939
 940 (defun mml-minibuffer-read-disposition (type &optional default)
 941   (let* ((default (or default
 942                       (if (string-match "^text/.*" type)
 943                           "inline"
 944                         "attachment")))
 945          (disposition (completing-read "Disposition: "
 946                                        '(("attachment") ("inline") (""))
 947                                        nil
 948                                        nil)))
 949     (if (not (equal disposition ""))
 950         disposition
 951       default)))
 952
 953 (defun mml-quote-region (beg end)
 954   "Quote the MML tags in the region."
 955   (interactive "r")
 956   (save-excursion
 957     (save-restriction
 958       ;; Temporarily narrow the region to defend from changes
 959       ;; invalidating END.
 960       (narrow-to-region beg end)
 961       (goto-char (point-min))
 962       ;; Quote parts.
 963       (while (re-search-forward
 964               "<#!*/?\\(multipart\\|part\\|external\\|mml\\)" nil t)
 965         ;; Insert ! after the #.
 966         (goto-char (+ (match-beginning 0) 2))
 967         (insert "!")))))
 968
 969 (defun mml-insert-tag (name &rest plist)
 970   "Insert an MML tag described by NAME and PLIST."
 971   (when (symbolp name)
 972     (setq name (symbol-name name)))
 973   (insert "<#" name)
 974   (while plist
 975     (let ((key (pop plist))
 976           (value (pop plist)))
 977       (when value
 978         ;; Quote VALUE if it contains suspicious characters.
 979         (when (string-match "[\"'\\~/*;() \t\n]" value)
 980           (setq value (with-output-to-string
 981                         (let (print-escape-nonascii)
 982                           (prin1 value)))))
 983         (insert (format " %s=%s" key value)))))
 984   (insert ">\n"))
 985
 986 (defun mml-insert-empty-tag (name &rest plist)
 987   "Insert an empty MML tag described by NAME and PLIST."
 988   (when (symbolp name)
 989     (setq name (symbol-name name)))
 990   (apply #'mml-insert-tag name plist)
 991   (insert "<#/" name ">\n"))
 992
 993 ;;; Attachment functions.
 994
 995 (defun mml-attach-file (file &optional type description disposition)
 996   "Attach a file to the outgoing MIME message.
 997 The file is not inserted or encoded until you send the message with
 998 `\\[message-send-and-exit]' or `\\[message-send]'.
 999
1000 FILE is the name of the file to attach.  TYPE is its content-type, a
1001 string of the form \"type/subtype\".  DESCRIPTION is a one-line
1002 description of the attachment."
1003   (interactive
1004    (let* ((file (mml-minibuffer-read-file "Attach file: "))
1005           (type (mml-minibuffer-read-type file))
1006           (description (mml-minibuffer-read-description))
1007           (disposition (mml-minibuffer-read-disposition type)))
1008      (list file type description disposition)))
1009   (mml-insert-empty-tag 'part
1010                         'type type
1011                         'filename file
1012                         'disposition (or disposition "attachment")
1013                         'description description))
1014
1015 (defun mml-attach-buffer (buffer &optional type description)
1016   "Attach a buffer to the outgoing MIME message.
1017 See `mml-attach-file' for details of operation."
1018   (interactive
1019    (let* ((buffer (read-buffer "Attach buffer: "))
1020           (type (mml-minibuffer-read-type buffer "text/plain"))
1021           (description (mml-minibuffer-read-description)))
1022      (list buffer type description)))
1023   (mml-insert-empty-tag 'part 'type type 'buffer buffer
1024                         'disposition "attachment" 'description description))
1025
1026 (defun mml-attach-external (file &optional type description)
1027   "Attach an external file into the buffer.
1028 FILE is an ange-ftp/efs specification of the part location.
1029 TYPE is the MIME type to use."
1030   (interactive
1031    (let* ((file (mml-minibuffer-read-file "Attach external file: "))
1032           (type (mml-minibuffer-read-type file))
1033           (description (mml-minibuffer-read-description)))
1034      (list file type description)))
1035   (mml-insert-empty-tag 'external 'type type 'name file
1036                         'disposition "attachment" 'description description))
1037
1038 (defun mml-insert-multipart (&optional type)
1039   (interactive (list (completing-read "Multipart type (default mixed): "
1040                                       '(("mixed") ("alternative") ("digest") ("parallel")
1041                                         ("signed") ("encrypted"))
1042                                       nil nil "mixed")))
1043   (or type
1044       (setq type "mixed"))
1045   (mml-insert-empty-tag "multipart" 'type type)
1046   (forward-line -1))
1047
1048 (defun mml-insert-part (&optional type)
1049   (interactive
1050    (list (mml-minibuffer-read-type "")))
1051   (mml-insert-tag 'part 'type type 'disposition "inline")
1052   (forward-line -1))
1053
1054 (defun mml-preview-insert-mail-followup-to ()
1055   "Insert a Mail-Followup-To header before previewing an article.
1056 Should be adopted if code in `message-send-mail' is changed."
1057   (when (and (message-mail-p)
1058              (message-subscribed-p)
1059              (not (mail-fetch-field "mail-followup-to"))
1060              (message-make-mail-followup-to))
1061     (message-position-on-field "Mail-Followup-To" "X-Draft-From")
1062     (insert (message-make-mail-followup-to))))
1063
1064 (defun mml-preview (&optional raw)
1065   "Display current buffer with Gnus, in a new buffer.
1066 If RAW, don't highlight the article."
1067   (interactive "P")
1068   (save-excursion
1069     (let* ((buf (current-buffer))
1070            (message-options message-options)
1071            (message-this-is-mail (message-mail-p))
1072            (message-this-is-news (message-news-p))
1073            (message-posting-charset (or (gnus-setup-posting-charset
1074                                          (save-restriction
1075                                            (message-narrow-to-headers-or-head)
1076                                            (message-fetch-field "Newsgroups")))
1077                                         message-posting-charset)))
1078       (message-options-set-recipient)
1079       (switch-to-buffer (generate-new-buffer
1080                          (concat (if raw "*Raw MIME preview of "
1081                                    "*MIME preview of ") (buffer-name))))
1082       (when (boundp 'gnus-buffers)
1083         (push (current-buffer) gnus-buffers))
1084       (erase-buffer)
1085       (insert-buffer-substring buf)
1086       (mml-preview-insert-mail-followup-to)
1087       (let ((message-deletable-headers (if (message-news-p)
1088                                            nil
1089                                          message-deletable-headers)))
1090         (message-generate-headers
1091          (copy-sequence (if (message-news-p)
1092                             message-required-news-headers
1093                           message-required-mail-headers))))
1094       (if (re-search-forward
1095            (concat "^" (regexp-quote mail-header-separator) "\n") nil t)
1096           (replace-match "\n"))
1097       (let ((mail-header-separator ""));; mail-header-separator is removed.
1098         (mml-to-mime))
1099       (if raw
1100           (when (fboundp 'set-buffer-multibyte)
1101             (let ((s (buffer-string)))
1102               ;; Insert the content into unibyte buffer.
1103               (erase-buffer)
1104               (mm-disable-multibyte)
1105               (insert s)))
1106         (let ((gnus-newsgroup-charset (car message-posting-charset))
1107               gnus-article-prepare-hook gnus-original-article-buffer)
1108           (run-hooks 'gnus-article-decode-hook)
1109           (let ((gnus-newsgroup-name "dummy")
1110                 (gnus-newsrc-hashtb (or gnus-newsrc-hashtb
1111                                         (gnus-make-hashtable 5))))
1112             (gnus-article-prepare-display))))
1113       ;; Disable article-mode-map.
1114       (use-local-map nil)
1115       (gnus-make-local-hook 'kill-buffer-hook)
1116       (add-hook 'kill-buffer-hook
1117                 (lambda ()
1118                   (mm-destroy-parts gnus-article-mime-handles)) nil t)
1119       (setq buffer-read-only t)
1120       (local-set-key "q" (lambda () (interactive) (kill-buffer nil)))
1121       (local-set-key "=" (lambda () (interactive) (delete-other-windows)))
1122       (local-set-key "\r"
1123                      (lambda ()
1124                        (interactive)
1125                        (widget-button-press (point))))
1126       (local-set-key gnus-mouse-2
1127                      (lambda (event)
1128                        (interactive "@e")
1129                        (widget-button-press (widget-event-point event) event)))
1130       (goto-char (point-min)))))
1131
1132 (defun mml-validate ()
1133   "Validate the current MML document."
1134   (interactive)
1135   (mml-parse))
1136
1137 (defun mml-tweak-part (cont)
1138   "Tweak a MML part."
1139   (let ((tweak (cdr (assq 'tweak cont)))
1140         func)
1141     (cond
1142      (tweak
1143       (setq func
1144             (or (cdr (assoc tweak mml-tweak-function-alist))
1145                 (intern tweak))))
1146      (mml-tweak-type-alist
1147       (let ((alist mml-tweak-type-alist)
1148             (type (or (cdr (assq 'type cont)) "text/plain")))
1149         (while alist
1150           (if (string-match (caar alist) type)
1151               (setq func (cdar alist)
1152                     alist nil)
1153             (setq alist (cdr alist)))))))
1154     (if func
1155         (funcall func cont)
1156       cont)
1157     (let ((alist mml-tweak-sexp-alist))
1158       (while alist
1159         (if (eval (caar alist))
1160             (funcall (cdar alist) cont))
1161         (setq alist (cdr alist)))))
1162   cont)
1163
1164 (defun mml-tweak-externalize-attachments (cont)
1165   "Tweak attached files as external parts."
1166   (let (filename-cons)
1167     (when (and (eq (car cont) 'part)
1168                (not (cdr (assq 'buffer cont)))
1169                (and (setq filename-cons (assq 'filename cont))
1170                     (not (equal (cdr (assq 'nofile cont)) "yes"))))
1171       (setcar cont 'external)
1172       (setcar filename-cons 'name))))
1173
1174 (provide 'mml)
1175
1176 ;;; arch-tag: 583c96cf-1ffe-451b-a5e5-4733ae9ddd12
1177 ;;; mml.el ends here