code.delx.au - gnu-emacs/blob - 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, 2006, 2007 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 3, 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 'message-info "message")
  42   (autoload 'fill-flowed-encode "flow-fill")
  43   (autoload 'message-posting-charset "message")
  44   (autoload 'dnd-get-local-file-name "dnd"))
  45
  46 (defvar gnus-article-mime-handles)
  47 (defvar gnus-mouse-2)
  48 (defvar gnus-newsrc-hashtb)
  49 (defvar message-default-charset)
  50 (defvar message-deletable-headers)
  51 (defvar message-options)
  52 (defvar message-posting-charset)
  53 (defvar message-required-mail-headers)
  54 (defvar message-required-news-headers)
  55 (defvar dnd-protocol-alist)
  56
  57 (defcustom mml-content-type-parameters
  58   '(name access-type expiration size permission format)
  59   "*A list of acceptable parameters in MML tag.
  60 These parameters are generated in Content-Type header if exists."
  61   :version "22.1"
  62   :type '(repeat (symbol :tag "Parameter"))
  63   :group 'message)
  64
  65 (defcustom mml-content-disposition-parameters
  66   '(filename creation-date modification-date read-date)
  67   "*A list of acceptable parameters in MML tag.
  68 These parameters are generated in Content-Disposition header if exists."
  69   :version "22.1"
  70   :type '(repeat (symbol :tag "Parameter"))
  71   :group 'message)
  72
  73 (defcustom mml-insert-mime-headers-always nil
  74   "If non-nil, always put Content-Type: text/plain at top of empty parts.
  75 It is necessary to work against a bug in certain clients."
  76   :version "22.1"
  77   :type 'boolean
  78   :group 'message)
  79
  80 (defvar mml-tweak-type-alist nil
  81   "A list of (TYPE . FUNCTION) for tweaking MML parts.
  82 TYPE is a string containing a regexp to match the MIME type.  FUNCTION
  83 is a Lisp function which is called with the MML handle to tweak the
  84 part.  This variable is used only when no TWEAK parameter exists in
  85 the MML handle.")
  86
  87 (defvar mml-tweak-function-alist nil
  88   "A list of (NAME . FUNCTION) for tweaking MML parts.
  89 NAME is a string containing the name of the TWEAK parameter in the MML
  90 handle.  FUNCTION is a Lisp function which is called with the MML
  91 handle to tweak the part.")
  92
  93 (defvar mml-tweak-sexp-alist
  94   '((mml-externalize-attachments . mml-tweak-externalize-attachments))
  95   "A list of (SEXP . FUNCTION) for tweaking MML parts.
  96 SEXP is an s-expression.  If the evaluation of SEXP is non-nil, FUNCTION
  97 is called.  FUNCTION is a Lisp function which is called with the MML
  98 handle to tweak the part.")
  99
 100 (defvar mml-externalize-attachments nil
 101   "*If non-nil, local-file attachments are generated as external parts.")
 102
 103 (defvar mml-generate-multipart-alist nil
 104   "*Alist of multipart generation functions.
 105 Each entry has the form (NAME . FUNCTION), where
 106 NAME is a string containing the name of the part (without the
 107 leading \"/multipart/\"),
 108 FUNCTION is a Lisp function which is called to generate the part.
 109
 110 The Lisp function has to supply the appropriate MIME headers and the
 111 contents of this part.")
 112
 113 (defvar mml-syntax-table
 114   (let ((table (copy-syntax-table emacs-lisp-mode-syntax-table)))
 115     (modify-syntax-entry ?\\ "/" table)
 116     (modify-syntax-entry ?< "(" table)
 117     (modify-syntax-entry ?> ")" table)
 118     (modify-syntax-entry ?@ "w" table)
 119     (modify-syntax-entry ?/ "w" table)
 120     (modify-syntax-entry ?= " " table)
 121     (modify-syntax-entry ?* " " table)
 122     (modify-syntax-entry ?\; " " table)
 123     (modify-syntax-entry ?\' " " table)
 124     table))
 125
 126 (defvar mml-boundary-function 'mml-make-boundary
 127   "A function called to suggest a boundary.
 128 The function may be called several times, and should try to make a new
 129 suggestion each time.  The function is called with one parameter,
 130 which is a number that says how many times the function has been
 131 called for this message.")
 132
 133 (defvar mml-confirmation-set nil
 134   "A list of symbols, each of which disables some warning.
 135 `unknown-encoding': always send messages contain characters with
 136 unknown encoding; `use-ascii': always use ASCII for those characters
 137 with unknown encoding; `multipart': always send messages with more than
 138 one charsets.")
 139
 140 (defvar mml-generate-default-type "text/plain"
 141   "Content type by which the Content-Type header can be omitted.
 142 The Content-Type header will not be put in the MIME part if the type
 143 equals the value and there's no parameter (e.g. charset, format, etc.)
 144 and `mml-insert-mime-headers-always' is nil.  The value will be bound
 145 to \"message/rfc822\" when encoding an article to be forwarded as a MIME
 146 part.  This is for the internal use, you should never modify the value.")
 147
 148 (defvar mml-buffer-list nil)
 149
 150 (defun mml-generate-new-buffer (name)
 151   (let ((buf (generate-new-buffer name)))
 152     (push buf mml-buffer-list)
 153     buf))
 154
 155 (defun mml-destroy-buffers ()
 156   (let (kill-buffer-hook)
 157     (mapcar 'kill-buffer mml-buffer-list)
 158     (setq mml-buffer-list nil)))
 159
 160 (defun mml-parse ()
 161   "Parse the current buffer as an MML document."
 162   (save-excursion
 163     (goto-char (point-min))
 164     (let ((table (syntax-table)))
 165       (unwind-protect
 166           (progn
 167             (set-syntax-table mml-syntax-table)
 168             (mml-parse-1))
 169         (set-syntax-table table)))))
 170
 171 (defun mml-parse-1 ()
 172   "Parse the current buffer as an MML document."
 173   (let (struct tag point contents charsets warn use-ascii no-markup-p raw)
 174     (while (and (not (eobp))
 175                 (not (looking-at "<#/multipart")))
 176       (cond
 177        ((looking-at "<#secure")
 178         ;; The secure part is essentially a meta-meta tag, which
 179         ;; expands to either a part tag if there are no other parts in
 180         ;; the document or a multipart tag if there are other parts
 181         ;; included in the message
 182         (let* (secure-mode
 183                (taginfo (mml-read-tag))
 184                (recipients (cdr (assq 'recipients taginfo)))
 185                (sender (cdr (assq 'sender taginfo)))
 186                (location (cdr (assq 'tag-location taginfo)))
 187                (mode (cdr (assq 'mode taginfo)))
 188                (method (cdr (assq 'method taginfo)))
 189                tags)
 190           (save-excursion
 191             (if
 192                 (re-search-forward
 193                  "<#\\(/\\)?\\(multipart\\|part\\|external\\|mml\\)." nil t)
 194                 (setq secure-mode "multipart")
 195               (setq secure-mode "part")))
 196           (save-excursion
 197             (goto-char location)
 198             (re-search-forward "<#secure[^\n]*>\n"))
 199           (delete-region (match-beginning 0) (match-end 0))
 200           (cond ((string= mode "sign")
 201                  (setq tags (list "sign" method)))
 202                 ((string= mode "encrypt")
 203                  (setq tags (list "encrypt" method)))
 204                 ((string= mode "signencrypt")
 205                  (setq tags (list "sign" method "encrypt" method))))
 206           (eval `(mml-insert-tag ,secure-mode
 207                                  ,@tags
 208                                  ,(if recipients "recipients")
 209                                  ,recipients
 210                                  ,(if sender "sender")
 211                                  ,sender))
 212           ;; restart the parse
 213           (goto-char location)))
 214        ((looking-at "<#multipart")
 215         (push (nconc (mml-read-tag) (mml-parse-1)) struct))
 216        ((looking-at "<#external")
 217         (push (nconc (mml-read-tag) (list (cons 'contents (mml-read-part))))
 218               struct))
 219        (t
 220         (if (or (looking-at "<#part") (looking-at "<#mml"))
 221             (setq tag (mml-read-tag)
 222                   no-markup-p nil
 223                   warn nil)
 224           (setq tag (list 'part '(type . "text/plain"))
 225                 no-markup-p t
 226                 warn t))
 227         (setq raw (cdr (assq 'raw tag))
 228               point (point)
 229               contents (mml-read-part (eq 'mml (car tag)))
 230               charsets (cond
 231                         (raw nil)
 232                         ((assq 'charset tag)
 233                          (list
 234                           (intern (downcase (cdr (assq 'charset tag))))))
 235                         (t
 236                          (mm-find-mime-charset-region point (point)))))
 237         (when (and (not raw) (memq nil charsets))
 238           (if (or (memq 'unknown-encoding mml-confirmation-set)
 239                   (message-options-get 'unknown-encoding)
 240                   (and (y-or-n-p "\
 241 Message contains characters with unknown encoding.  Really send? ")
 242                        (message-options-set 'unknown-encoding t)))
 243               (if (setq use-ascii
 244                         (or (memq 'use-ascii mml-confirmation-set)
 245                             (message-options-get 'use-ascii)
 246                             (and (y-or-n-p "Use ASCII as charset? ")
 247                                  (message-options-set 'use-ascii t))))
 248                   (setq charsets (delq nil charsets))
 249                 (setq warn nil))
 250             (error "Edit your message to remove those characters")))
 251         (if (or raw
 252                 (eq 'mml (car tag))
 253                 (< (length charsets) 2))
 254             (if (or (not no-markup-p)
 255                     (string-match "[^ \t\r\n]" contents))
 256                 ;; Don't create blank parts.
 257                 (push (nconc tag (list (cons 'contents contents)))
 258                       struct))
 259           (let ((nstruct (mml-parse-singlepart-with-multiple-charsets
 260                           tag point (point) use-ascii)))
 261             (when (and warn
 262                        (not (memq 'multipart mml-confirmation-set))
 263                        (not (message-options-get 'multipart))
 264                        (not (and (y-or-n-p (format "\
 265 A message part needs to be split into %d charset parts.  Really send? "
 266                                                    (length nstruct)))
 267                                  (message-options-set 'multipart t))))
 268               (error "Edit your message to use only one charset"))
 269             (setq struct (nconc nstruct struct)))))))
 270     (unless (eobp)
 271       (forward-line 1))
 272     (nreverse struct)))
 273
 274 (defun mml-parse-singlepart-with-multiple-charsets
 275   (orig-tag beg end &optional use-ascii)
 276   (save-excursion
 277     (save-restriction
 278       (narrow-to-region beg end)
 279       (goto-char (point-min))
 280       (let ((current (or (mm-mime-charset (mm-charset-after))
 281                          (and use-ascii 'us-ascii)))
 282             charset struct space newline paragraph)
 283         (while (not (eobp))
 284           (setq charset (mm-mime-charset (mm-charset-after)))
 285           (cond
 286            ;; The charset remains the same.
 287            ((eq charset 'us-ascii))
 288            ((or (and use-ascii (not charset))
 289                 (eq charset current))
 290             (setq space nil
 291                   newline nil
 292                   paragraph nil))
 293            ;; The initial charset was ascii.
 294            ((eq current 'us-ascii)
 295             (setq current charset
 296                   space nil
 297                   newline nil
 298                   paragraph nil))
 299            ;; We have a change in charsets.
 300            (t
 301             (push (append
 302                    orig-tag
 303                    (list (cons 'contents
 304                                (buffer-substring-no-properties
 305                                 beg (or paragraph newline space (point))))))
 306                   struct)
 307             (setq beg (or paragraph newline space (point))
 308                   current charset
 309                   space nil
 310                   newline nil
 311                   paragraph nil)))
 312           ;; Compute places where it might be nice to break the part.
 313           (cond
 314            ((memq (following-char) '(?  ?\t))
 315             (setq space (1+ (point))))
 316            ((and (eq (following-char) ?\n)
 317                  (not (bobp))
 318                  (eq (char-after (1- (point))) ?\n))
 319             (setq paragraph (point)))
 320            ((eq (following-char) ?\n)
 321             (setq newline (1+ (point)))))
 322           (forward-char 1))
 323         ;; Do the final part.
 324         (unless (= beg (point))
 325           (push (append orig-tag
 326                         (list (cons 'contents
 327                                     (buffer-substring-no-properties
 328                                      beg (point)))))
 329                 struct))
 330         struct))))
 331
 332 (defun mml-read-tag ()
 333   "Read a tag and return the contents."
 334   (let ((orig-point (point))
 335         contents name elem val)
 336     (forward-char 2)
 337     (setq name (buffer-substring-no-properties
 338                 (point) (progn (forward-sexp 1) (point))))
 339     (skip-chars-forward " \t\n")
 340     (while (not (looking-at ">[ \t]*\n?"))
 341       (setq elem (buffer-substring-no-properties
 342                   (point) (progn (forward-sexp 1) (point))))
 343       (skip-chars-forward "= \t\n")
 344       (setq val (buffer-substring-no-properties
 345                  (point) (progn (forward-sexp 1) (point))))
 346       (when (string-match "^\"\\(.*\\)\"$" val)
 347         (setq val (match-string 1 val)))
 348       (push (cons (intern elem) val) contents)
 349       (skip-chars-forward " \t\n"))
 350     (goto-char (match-end 0))
 351     ;; Don't skip the leading space.
 352     ;;(skip-chars-forward " \t\n")
 353     ;; Put the tag location into the returned contents
 354     (setq contents (append (list (cons 'tag-location orig-point)) contents))
 355     (cons (intern name) (nreverse contents))))
 356
 357 (defun mml-buffer-substring-no-properties-except-hard-newlines (start end)
 358   (let ((str (buffer-substring-no-properties start end))
 359         (bufstart start) tmp)
 360     (while (setq tmp (text-property-any start end 'hard 't))
 361       (set-text-properties (- tmp bufstart) (- tmp bufstart -1)
 362                            '(hard t) str)
 363       (setq start (1+ tmp)))
 364     str))
 365
 366 (defun mml-read-part (&optional mml)
 367   "Return the buffer up till the next part, multipart or closing part or multipart.
 368 If MML is non-nil, return the buffer up till the correspondent mml tag."
 369   (let ((beg (point)) (count 1))
 370     ;; If the tag ended at the end of the line, we go to the next line.
 371     (when (looking-at "[ \t]*\n")
 372       (forward-line 1))
 373     (if mml
 374         (progn
 375           (while (and (> count 0) (not (eobp)))
 376             (if (re-search-forward "<#\\(/\\)?mml." nil t)
 377                 (setq count (+ count (if (match-beginning 1) -1 1)))
 378               (goto-char (point-max))))
 379           (mml-buffer-substring-no-properties-except-hard-newlines
 380            beg (if (> count 0)
 381                    (point)
 382                  (match-beginning 0))))
 383       (if (re-search-forward
 384            "<#\\(/\\)?\\(multipart\\|part\\|external\\|mml\\)." nil t)
 385           (prog1
 386               (mml-buffer-substring-no-properties-except-hard-newlines
 387                beg (match-beginning 0))
 388             (if (or (not (match-beginning 1))
 389                     (equal (match-string 2) "multipart"))
 390                 (goto-char (match-beginning 0))
 391               (when (looking-at "[ \t]*\n")
 392                 (forward-line 1))))
 393         (mml-buffer-substring-no-properties-except-hard-newlines
 394          beg (goto-char (point-max)))))))
 395
 396 (defvar mml-boundary nil)
 397 (defvar mml-base-boundary "-=-=")
 398 (defvar mml-multipart-number 0)
 399
 400 (defun mml-generate-mime ()
 401   "Generate a MIME message based on the current MML document."
 402   (let ((cont (mml-parse))
 403         (mml-multipart-number mml-multipart-number))
 404     (if (not cont)
 405         nil
 406       (mm-with-multibyte-buffer
 407         (if (and (consp (car cont))
 408                  (= (length cont) 1))
 409             (mml-generate-mime-1 (car cont))
 410           (mml-generate-mime-1 (nconc (list 'multipart '(type . "mixed"))
 411                                       cont)))
 412         (buffer-string)))))
 413
 414 (defun mml-generate-mime-1 (cont)
 415   (let ((mm-use-ultra-safe-encoding
 416          (or mm-use-ultra-safe-encoding (assq 'sign cont))))
 417     (save-restriction
 418       (narrow-to-region (point) (point))
 419       (mml-tweak-part cont)
 420       (cond
 421        ((or (eq (car cont) 'part) (eq (car cont) 'mml))
 422         (let* ((raw (cdr (assq 'raw cont)))
 423                (filename (cdr (assq 'filename cont)))
 424                (type (or (cdr (assq 'type cont))
 425                          (if filename
 426                              (or (mm-default-file-encoding filename)
 427                                  "application/octet-stream")
 428                            "text/plain")))
 429                coded encoding charset flowed)
 430           (if (and (not raw)
 431                    (member (car (split-string type "/")) '("text" "message")))
 432               (progn
 433                 (with-temp-buffer
 434                   (setq charset (mm-charset-to-coding-system
 435                                  (cdr (assq 'charset cont))))
 436                   (when (eq charset 'ascii)
 437                     (setq charset nil))
 438                   (cond
 439                    ((cdr (assq 'buffer cont))
 440                     (insert-buffer-substring (cdr (assq 'buffer cont))))
 441                    ((and filename
 442                          (not (equal (cdr (assq 'nofile cont)) "yes")))
 443                     (let ((coding-system-for-read charset))
 444                       (mm-insert-file-contents filename)))
 445                    ((eq 'mml (car cont))
 446                     (insert (cdr (assq 'contents cont))))
 447                    (t
 448                     (save-restriction
 449                       (narrow-to-region (point) (point))
 450                       (insert (cdr (assq 'contents cont)))
 451                       ;; Remove quotes from quoted tags.
 452                       (goto-char (point-min))
 453                       (while (re-search-forward
 454                               "<#!+/?\\(part\\|multipart\\|external\\|mml\\)"
 455                               nil t)
 456                         (delete-region (+ (match-beginning 0) 2)
 457                                        (+ (match-beginning 0) 3))))))
 458                   (cond
 459                    ((eq (car cont) 'mml)
 460                     (let ((mml-boundary (mml-compute-boundary cont))
 461                           ;; It is necessary for the case where this
 462                           ;; function is called recursively since
 463                           ;; `m-g-d-t' will be bound to "message/rfc822"
 464                           ;; when encoding an article to be forwarded.
 465                           (mml-generate-default-type "text/plain"))
 466                       (mml-to-mime))
 467                     (let ((mm-7bit-chars (concat mm-7bit-chars "\x1b")))
 468                       ;; ignore 0x1b, it is part of iso-2022-jp
 469                       (setq encoding (mm-body-7-or-8))))
 470                    ((string= (car (split-string type "/")) "message")
 471                     (let ((mm-7bit-chars (concat mm-7bit-chars "\x1b")))
 472                       ;; ignore 0x1b, it is part of iso-2022-jp
 473                       (setq encoding (mm-body-7-or-8))))
 474                    (t
 475                     ;; Only perform format=flowed filling on text/plain
 476                     ;; parts where there either isn't a format parameter
 477                     ;; in the mml tag or it says "flowed" and there
 478                     ;; actually are hard newlines in the text.
 479                     (let (use-hard-newlines)
 480                       (when (and (string= type "text/plain")
 481                                  (not (string= (cdr (assq 'sign cont)) "pgp"))
 482                                  (or (null (assq 'format cont))
 483                                      (string= (cdr (assq 'format cont))
 484                                               "flowed"))
 485                                  (setq use-hard-newlines
 486                                        (text-property-any
 487                                         (point-min) (point-max) 'hard 't)))
 488                         (fill-flowed-encode)
 489                         ;; Indicate that `mml-insert-mime-headers' should
 490                         ;; insert a "; format=flowed" string unless the
 491                         ;; user has already specified it.
 492                         (setq flowed (null (assq 'format cont)))))
 493                     (setq charset (mm-encode-body charset))
 494                     (setq encoding (mm-body-encoding
 495                                     charset (cdr (assq 'encoding cont))))))
 496                   (setq coded (buffer-string)))
 497                 (mml-insert-mime-headers cont type charset encoding flowed)
 498                 (insert "\n")
 499                 (insert coded))
 500             (mm-with-unibyte-buffer
 501               (cond
 502                ((cdr (assq 'buffer cont))
 503                 (insert (mm-string-as-unibyte
 504                          (with-current-buffer (cdr (assq 'buffer cont))
 505                            (buffer-string)))))
 506                ((and filename
 507                      (not (equal (cdr (assq 'nofile cont)) "yes")))
 508                 (let ((coding-system-for-read mm-binary-coding-system))
 509                   (mm-insert-file-contents filename nil nil nil nil t)))
 510                (t
 511                 (let ((contents (cdr (assq 'contents cont))))
 512                   (if (if (featurep 'xemacs)
 513                           (string-match "[^\000-\377]" contents)
 514                         (mm-multibyte-string-p contents))
 515                       (progn
 516                         (mm-enable-multibyte)
 517                         (insert contents)
 518                         (unless raw
 519                           (setq charset (mm-encode-body))))
 520                     (insert contents)))))
 521               (setq encoding (mm-encode-buffer type)
 522                     coded (mm-string-as-multibyte (buffer-string))))
 523             (mml-insert-mime-headers cont type charset encoding nil)
 524             (insert "\n" coded))))
 525        ((eq (car cont) 'external)
 526         (insert "Content-Type: message/external-body")
 527         (let ((parameters (mml-parameter-string
 528                            cont '(expiration size permission)))
 529               (name (cdr (assq 'name cont)))
 530               (url (cdr (assq 'url cont))))
 531           (when name
 532             (setq name (mml-parse-file-name name))
 533             (if (stringp name)
 534                 (mml-insert-parameter
 535                  (mail-header-encode-parameter "name" name)
 536                  "access-type=local-file")
 537               (mml-insert-parameter
 538                (mail-header-encode-parameter
 539                 "name" (file-name-nondirectory (nth 2 name)))
 540                (mail-header-encode-parameter "site" (nth 1 name))
 541                (mail-header-encode-parameter
 542                 "directory" (file-name-directory (nth 2 name))))
 543               (mml-insert-parameter
 544                (concat "access-type="
 545                        (if (member (nth 0 name) '("ftp@" "anonymous@"))
 546                            "anon-ftp"
 547                          "ftp")))))
 548           (when url
 549             (mml-insert-parameter
 550              (mail-header-encode-parameter "url" url)
 551              "access-type=url"))
 552           (when parameters
 553             (mml-insert-parameter-string
 554              cont '(expiration size permission)))
 555           (insert "\n\n")
 556           (insert "Content-Type: "
 557                   (or (cdr (assq 'type cont))
 558                       (if name
 559                           (or (mm-default-file-encoding name)
 560                               "application/octet-stream")
 561                         "text/plain"))
 562                   "\n")
 563           (insert "Content-ID: " (message-make-message-id) "\n")
 564           (insert "Content-Transfer-Encoding: "
 565                   (or (cdr (assq 'encoding cont)) "binary"))
 566           (insert "\n\n")
 567           (insert (or (cdr (assq 'contents cont))))
 568           (insert "\n")))
 569        ((eq (car cont) 'multipart)
 570         (let* ((type (or (cdr (assq 'type cont)) "mixed"))
 571                (mml-generate-default-type (if (equal type "digest")
 572                                               "message/rfc822"
 573                                             "text/plain"))
 574                (handler (assoc type mml-generate-multipart-alist)))
 575           (if handler
 576               (funcall (cdr handler) cont)
 577             ;; No specific handler.  Use default one.
 578             (let ((mml-boundary (mml-compute-boundary cont)))
 579               (insert (format "Content-Type: multipart/%s; boundary=\"%s\""
 580                               type mml-boundary)
 581                       (if (cdr (assq 'start cont))
 582                           (format "; start=\"%s\"\n" (cdr (assq 'start cont)))
 583                         "\n"))
 584               (let ((cont cont) part)
 585                 (while (setq part (pop cont))
 586                   ;; Skip `multipart' and attributes.
 587                   (when (and (consp part) (consp (cdr part)))
 588                     (insert "\n--" mml-boundary "\n")
 589                     (mml-generate-mime-1 part)
 590                     (goto-char (point-max)))))
 591               (insert "\n--" mml-boundary "--\n")))))
 592        (t
 593         (error "Invalid element: %S" cont)))
 594       ;; handle sign & encrypt tags in a semi-smart way.
 595       (let ((sign-item (assoc (cdr (assq 'sign cont)) mml-sign-alist))
 596             (encrypt-item (assoc (cdr (assq 'encrypt cont))
 597                                  mml-encrypt-alist))
 598             sender recipients)
 599         (when (or sign-item encrypt-item)
 600           (when (setq sender (cdr (assq 'sender cont)))
 601             (message-options-set 'mml-sender sender)
 602             (message-options-set 'message-sender sender))
 603           (if (setq recipients (cdr (assq 'recipients cont)))
 604               (message-options-set 'message-recipients recipients))
 605           (let ((style (mml-signencrypt-style
 606                         (first (or sign-item encrypt-item)))))
 607             ;; check if: we're both signing & encrypting, both methods
 608             ;; are the same (why would they be different?!), and that
 609             ;; the signencrypt style allows for combined operation.
 610             (if (and sign-item encrypt-item (equal (first sign-item)
 611                                                    (first encrypt-item))
 612                      (equal style 'combined))
 613                 (funcall (nth 1 encrypt-item) cont t)
 614               ;; otherwise, revert to the old behavior.
 615               (when sign-item
 616                 (funcall (nth 1 sign-item) cont))
 617               (when encrypt-item
 618                 (funcall (nth 1 encrypt-item) cont)))))))))
 619
 620 (defun mml-compute-boundary (cont)
 621   "Return a unique boundary that does not exist in CONT."
 622   (let ((mml-boundary (funcall mml-boundary-function
 623                                (incf mml-multipart-number))))
 624     ;; This function tries again and again until it has found
 625     ;; a unique boundary.
 626     (while (not (catch 'not-unique
 627                   (mml-compute-boundary-1 cont))))
 628     mml-boundary))
 629
 630 (defun mml-compute-boundary-1 (cont)
 631   (let (filename)
 632     (cond
 633      ((eq (car cont) 'part)
 634       (with-temp-buffer
 635         (cond
 636          ((cdr (assq 'buffer cont))
 637           (insert-buffer-substring (cdr (assq 'buffer cont))))
 638          ((and (setq filename (cdr (assq 'filename cont)))
 639                (not (equal (cdr (assq 'nofile cont)) "yes")))
 640           (mm-insert-file-contents filename nil nil nil nil t))
 641          (t
 642           (insert (cdr (assq 'contents cont)))))
 643         (goto-char (point-min))
 644         (when (re-search-forward (concat "^--" (regexp-quote mml-boundary))
 645                                  nil t)
 646           (setq mml-boundary (funcall mml-boundary-function
 647                                       (incf mml-multipart-number)))
 648           (throw 'not-unique nil))))
 649      ((eq (car cont) 'multipart)
 650       (mapcar 'mml-compute-boundary-1 (cddr cont))))
 651     t))
 652
 653 (defun mml-make-boundary (number)
 654   (concat (make-string (% number 60) ?=)
 655           (if (> number 17)
 656               (format "%x" number)
 657             "")
 658           mml-base-boundary))
 659
 660 (defun mml-insert-mime-headers (cont type charset encoding flowed)
 661   (let (parameters id disposition description)
 662     (setq parameters
 663           (mml-parameter-string
 664            cont mml-content-type-parameters))
 665     (when (or charset
 666               parameters
 667               flowed
 668               (not (equal type mml-generate-default-type))
 669               mml-insert-mime-headers-always)
 670       (when (consp charset)
 671         (error
 672          "Can't encode a part with several charsets"))
 673       (insert "Content-Type: " type)
 674       (when charset
 675         (mml-insert-parameter
 676          (mail-header-encode-parameter "charset" (symbol-name charset))))
 677       (when flowed
 678         (mml-insert-parameter "format=flowed"))
 679       (when parameters
 680         (mml-insert-parameter-string
 681          cont mml-content-type-parameters))
 682       (insert "\n"))
 683     (when (setq id (cdr (assq 'id cont)))
 684       (insert "Content-ID: " id "\n"))
 685     (setq parameters
 686           (mml-parameter-string
 687            cont mml-content-disposition-parameters))
 688     (when (or (setq disposition (cdr (assq 'disposition cont)))
 689               parameters)
 690       (insert "Content-Disposition: " (or disposition "inline"))
 691       (when parameters
 692         (mml-insert-parameter-string
 693          cont mml-content-disposition-parameters))
 694       (insert "\n"))
 695     (unless (eq encoding '7bit)
 696       (insert (format "Content-Transfer-Encoding: %s\n" encoding)))
 697     (when (setq description (cdr (assq 'description cont)))
 698       (insert "Content-Description: ")
 699       (setq description (prog1
 700                             (point)
 701                           (insert description "\n")))
 702       (mail-encode-encoded-word-region description (point)))))
 703
 704 (defun mml-parameter-string (cont types)
 705   (let ((string "")
 706         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         (setq string (concat string "; "
 713                              (mail-header-encode-parameter
 714                               (symbol-name type) value)))))
 715     (when (not (zerop (length string)))
 716       string)))
 717
 718 (defun mml-insert-parameter-string (cont types)
 719   (let (value type)
 720     (while (setq type (pop types))
 721       (when (setq value (cdr (assq type cont)))
 722         ;; Strip directory component from the filename parameter.
 723         (when (eq type 'filename)
 724           (setq value (file-name-nondirectory value)))
 725         (mml-insert-parameter
 726          (mail-header-encode-parameter
 727           (symbol-name type) value))))))
 728
 729 (eval-when-compile
 730   (defvar ange-ftp-name-format)
 731   (defvar efs-path-regexp))
 732 (defun mml-parse-file-name (path)
 733   (if (if (boundp 'efs-path-regexp)
 734           (string-match efs-path-regexp path)
 735         (if (boundp 'ange-ftp-name-format)
 736             (string-match (car ange-ftp-name-format) path)))
 737       (list (match-string 1 path) (match-string 2 path)
 738             (substring path (1+ (match-end 2))))
 739     path))
 740
 741 (defun mml-insert-buffer (buffer)
 742   "Insert BUFFER at point and quote any MML markup."
 743   (save-restriction
 744     (narrow-to-region (point) (point))
 745     (insert-buffer-substring buffer)
 746     (mml-quote-region (point-min) (point-max))
 747     (goto-char (point-max))))
 748
 749 ;;;
 750 ;;; Transforming MIME to MML
 751 ;;;
 752
 753 (defun mime-to-mml (&optional handles)
 754   "Translate the current buffer (which should be a message) into MML.
 755 If HANDLES is non-nil, use it instead reparsing the buffer."
 756   ;; First decode the head.
 757   (save-restriction
 758     (message-narrow-to-head)
 759     (let ((rfc2047-quote-decoded-words-containing-tspecials t))
 760       (mail-decode-encoded-word-region (point-min) (point-max))))
 761   (unless handles
 762     (setq handles (mm-dissect-buffer t)))
 763   (goto-char (point-min))
 764   (search-forward "\n\n" nil t)
 765   (delete-region (point) (point-max))
 766   (if (stringp (car handles))
 767       (mml-insert-mime handles)
 768     (mml-insert-mime handles t))
 769   (mm-destroy-parts handles)
 770   (save-restriction
 771     (message-narrow-to-head)
 772     ;; Remove them, they are confusing.
 773     (message-remove-header "Content-Type")
 774     (message-remove-header "MIME-Version")
 775     (message-remove-header "Content-Disposition")
 776     (message-remove-header "Content-Transfer-Encoding")))
 777
 778 (defun mml-to-mime ()
 779   "Translate the current buffer from MML to MIME."
 780   (message-encode-message-body)
 781   (save-restriction
 782     (message-narrow-to-headers-or-head)
 783     ;; Skip past any From_ headers.
 784     (while (looking-at "From ")
 785       (forward-line 1))
 786     (let ((mail-parse-charset message-default-charset))
 787       (mail-encode-encoded-word-buffer))))
 788
 789 (defun mml-insert-mime (handle &optional no-markup)
 790   (let (textp buffer mmlp)
 791     ;; Determine type and stuff.
 792     (unless (stringp (car handle))
 793       (unless (setq textp (equal (mm-handle-media-supertype handle) "text"))
 794         (save-excursion
 795           (set-buffer (setq buffer (mml-generate-new-buffer " *mml*")))
 796           (mm-insert-part handle 'no-cache)
 797           (if (setq mmlp (equal (mm-handle-media-type handle)
 798                                 "message/rfc822"))
 799               (mime-to-mml)))))
 800     (if mmlp
 801         (mml-insert-mml-markup handle nil t t)
 802       (unless (and no-markup
 803                    (equal (mm-handle-media-type handle) "text/plain"))
 804         (mml-insert-mml-markup handle buffer textp)))
 805     (cond
 806      (mmlp
 807       (insert-buffer-substring buffer)
 808       (goto-char (point-max))
 809       (insert "<#/mml>\n"))
 810      ((stringp (car handle))
 811       (mapcar 'mml-insert-mime (cdr handle))
 812       (insert "<#/multipart>\n"))
 813      (textp
 814       (let ((charset (mail-content-type-get
 815                       (mm-handle-type handle) 'charset))
 816             (start (point)))
 817         (if (eq charset 'gnus-decoded)
 818             (mm-insert-part handle)
 819           (insert (mm-decode-string (mm-get-part handle) charset)))
 820         (mml-quote-region start (point)))
 821       (goto-char (point-max)))
 822      (t
 823       (insert "<#/part>\n")))))
 824
 825 (defun mml-insert-mml-markup (handle &optional buffer nofile mmlp)
 826   "Take a MIME handle and insert an MML tag."
 827   (if (stringp (car handle))
 828       (progn
 829         (insert "<#multipart type=" (mm-handle-media-subtype handle))
 830         (let ((start (mm-handle-multipart-ctl-parameter handle 'start)))
 831           (when start
 832             (insert " start=\"" start "\"")))
 833         (insert ">\n"))
 834     (if mmlp
 835         (insert "<#mml type=" (mm-handle-media-type handle))
 836       (insert "<#part type=" (mm-handle-media-type handle)))
 837     (dolist (elem (append (cdr (mm-handle-type handle))
 838                           (cdr (mm-handle-disposition handle))))
 839       (unless (symbolp (cdr elem))
 840         (insert " " (symbol-name (car elem)) "=\"" (cdr elem) "\"")))
 841     (when (mm-handle-id handle)
 842       (insert " id=\"" (mm-handle-id handle) "\""))
 843     (when (mm-handle-disposition handle)
 844       (insert " disposition=" (car (mm-handle-disposition handle))))
 845     (when buffer
 846       (insert " buffer=\"" (buffer-name buffer) "\""))
 847     (when nofile
 848       (insert " nofile=yes"))
 849     (when (mm-handle-description handle)
 850       (insert " description=\"" (mm-handle-description handle) "\""))
 851     (insert ">\n")))
 852
 853 (defun mml-insert-parameter (&rest parameters)
 854   "Insert PARAMETERS in a nice way."
 855   (let (start end)
 856     (dolist (param parameters)
 857       (insert ";")
 858       (setq start (point))
 859       (insert " " param)
 860       (setq end (point))
 861       (goto-char start)
 862       (end-of-line)
 863       (if (> (current-column) 76)
 864           (progn
 865             (goto-char start)
 866             (insert "\n")
 867             (goto-char (1+ end)))
 868         (goto-char end)))))
 869
 870 ;;;
 871 ;;; Mode for inserting and editing MML forms
 872 ;;;
 873
 874 (defvar mml-mode-map
 875   (let ((sign (make-sparse-keymap))
 876         (encrypt (make-sparse-keymap))
 877         (signpart (make-sparse-keymap))
 878         (encryptpart (make-sparse-keymap))
 879         (map (make-sparse-keymap))
 880         (main (make-sparse-keymap)))
 881     (define-key map "\C-s" 'mml-secure-message-sign)
 882     (define-key map "\C-c" 'mml-secure-message-encrypt)
 883     (define-key map "\C-e" 'mml-secure-message-sign-encrypt)
 884     (define-key map "\C-p\C-s" 'mml-secure-sign)
 885     (define-key map "\C-p\C-c" 'mml-secure-encrypt)
 886     (define-key sign "p" 'mml-secure-message-sign-pgpmime)
 887     (define-key sign "o" 'mml-secure-message-sign-pgp)
 888     (define-key sign "s" 'mml-secure-message-sign-smime)
 889     (define-key signpart "p" 'mml-secure-sign-pgpmime)
 890     (define-key signpart "o" 'mml-secure-sign-pgp)
 891     (define-key signpart "s" 'mml-secure-sign-smime)
 892     (define-key encrypt "p" 'mml-secure-message-encrypt-pgpmime)
 893     (define-key encrypt "o" 'mml-secure-message-encrypt-pgp)
 894     (define-key encrypt "s" 'mml-secure-message-encrypt-smime)
 895     (define-key encryptpart "p" 'mml-secure-encrypt-pgpmime)
 896     (define-key encryptpart "o" 'mml-secure-encrypt-pgp)
 897     (define-key encryptpart "s" 'mml-secure-encrypt-smime)
 898     (define-key map "\C-n" 'mml-unsecure-message)
 899     (define-key map "f" 'mml-attach-file)
 900     (define-key map "b" 'mml-attach-buffer)
 901     (define-key map "e" 'mml-attach-external)
 902     (define-key map "q" 'mml-quote-region)
 903     (define-key map "m" 'mml-insert-multipart)
 904     (define-key map "p" 'mml-insert-part)
 905     (define-key map "v" 'mml-validate)
 906     (define-key map "P" 'mml-preview)
 907     (define-key map "s" sign)
 908     (define-key map "S" signpart)
 909     (define-key map "c" encrypt)
 910     (define-key map "C" encryptpart)
 911     ;;(define-key map "n" 'mml-narrow-to-part)
 912     ;; `M-m' conflicts with `back-to-indentation'.
 913     ;; (define-key main "\M-m" map)
 914     (define-key main "\C-c\C-m" map)
 915     main))
 916
 917 (easy-menu-define
 918   mml-menu mml-mode-map ""
 919   `("Attachments"
 920     ["Attach File..." mml-attach-file
 921      ,@(if (featurep 'xemacs) '(t)
 922          '(:help "Attach a file at point"))]
 923     ["Attach Buffer..." mml-attach-buffer
 924      ,@(if (featurep 'xemacs) '(t)
 925          '(:help "Attach a buffer to the outgoing MIME message"))]
 926     ["Attach External..." mml-attach-external
 927      ,@(if (featurep 'xemacs) '(t)
 928          '(:help "Attach reference to file"))]
 929     ;;
 930     ("Change Security Method"
 931      ["PGP/MIME"
 932       (lambda () (interactive) (setq mml-secure-method "pgpmime"))
 933       ,@(if (featurep 'xemacs) nil
 934           '(:help "Set Security Method to PGP/MIME"))
 935       :style radio
 936       :selected (equal mml-secure-method "pgpmime") ]
 937      ["S/MIME"
 938       (lambda () (interactive) (setq mml-secure-method "smime"))
 939       ,@(if (featurep 'xemacs) nil
 940           '(:help "Set Security Method to S/MIME"))
 941       :style radio
 942       :selected (equal mml-secure-method "smime") ]
 943      ["Inline PGP"
 944       (lambda () (interactive) (setq mml-secure-method "pgp"))
 945       ,@(if (featurep 'xemacs) nil
 946           '(:help "Set Security Method to inline PGP"))
 947       :style radio
 948       :selected (equal mml-secure-method "pgp") ] )
 949     ;;
 950     ["Sign Message" mml-secure-message-sign t]
 951     ["Encrypt Message" mml-secure-message-encrypt t]
 952     ["Sign and Encrypt Message" mml-secure-message-sign-encrypt t]
 953     ["Encrypt/Sign off" mml-unsecure-message
 954      ,@(if (featurep 'xemacs) '(t)
 955          '(:help "Don't Encrypt/Sign Message"))]
 956     ;; Maybe we could remove these, because people who write MML most probably
 957     ;; don't use the menu:
 958     ["Insert Part..." mml-insert-part
 959      :active (message-in-body-p)]
 960     ["Insert Multipart..." mml-insert-multipart
 961      :active (message-in-body-p)]
 962     ;;
 963     ;; Do we have separate encrypt and encrypt/sign commands for parts?
 964     ["Sign Part" mml-secure-sign t]
 965     ["Encrypt Part" mml-secure-encrypt t]
 966     ;;["Narrow" mml-narrow-to-part t]
 967     ["Quote MML in region" mml-quote-region
 968      :active (message-mark-active-p)
 969      ,@(if (featurep 'xemacs) nil
 970          '(:help "Quote MML tags in region"))]
 971     ["Validate MML" mml-validate t]
 972     ["Preview" mml-preview t]
 973     "----"
 974     ["Emacs MIME manual" (lambda () (interactive) (message-info 4))
 975      ,@(if (featurep 'xemacs) '(t)
 976          '(:help "Display the Emacs MIME manual"))]
 977     ["PGG manual" (lambda () (interactive) (message-info 16))
 978      ,@(if (featurep 'xemacs) '(t)
 979          '(:help "Display the PGG manual"))]))
 980
 981 (defvar mml-mode nil
 982   "Minor mode for editing MML.")
 983
 984 (defun mml-mode (&optional arg)
 985   "Minor mode for editing MML.
 986 MML is the MIME Meta Language, a minor mode for composing MIME articles.
 987 See Info node `(emacs-mime)Composing'.
 988
 989 \\{mml-mode-map}"
 990   (interactive "P")
 991   (when (set (make-local-variable 'mml-mode)
 992              (if (null arg) (not mml-mode)
 993                (> (prefix-numeric-value arg) 0)))
 994     (add-minor-mode 'mml-mode " MML" mml-mode-map)
 995     (easy-menu-add mml-menu mml-mode-map)
 996     (when (boundp 'dnd-protocol-alist)
 997       (set (make-local-variable 'dnd-protocol-alist)
 998            (append mml-dnd-protocol-alist dnd-protocol-alist)))
 999     (run-hooks 'mml-mode-hook)))
1000
1001 ;;;
1002 ;;; Helper functions for reading MIME stuff from the minibuffer and
1003 ;;; inserting stuff to the buffer.
1004 ;;;
1005
1006 (defun mml-minibuffer-read-file (prompt)
1007   (let* ((completion-ignored-extensions nil)
1008          (file (read-file-name prompt nil nil t)))
1009     ;; Prevent some common errors.  This is inspired by similar code in
1010     ;; VM.
1011     (when (file-directory-p file)
1012       (error "%s is a directory, cannot attach" file))
1013     (unless (file-exists-p file)
1014       (error "No such file: %s" file))
1015     (unless (file-readable-p file)
1016       (error "Permission denied: %s" file))
1017     file))
1018
1019 (defun mml-minibuffer-read-type (name &optional default)
1020   (mailcap-parse-mimetypes)
1021   (let* ((default (or default
1022                       (mm-default-file-encoding name)
1023                       ;; Perhaps here we should check what the file
1024                       ;; looks like, and offer text/plain if it looks
1025                       ;; like text/plain.
1026                       "application/octet-stream"))
1027          (string (completing-read
1028                   (format "Content type (default %s): " default)
1029                   (mapcar 'list (mailcap-mime-types)))))
1030     (if (not (equal string ""))
1031         string
1032       default)))
1033
1034 (defun mml-minibuffer-read-description ()
1035   (let ((description (read-string "One line description: ")))
1036     (when (string-match "\\`[ \t]*\\'" description)
1037       (setq description nil))
1038     description))
1039
1040 (defun mml-minibuffer-read-disposition (type &optional default)
1041   (unless default (setq default
1042                         (if (and (string-match "\\`text/" type)
1043                                  (not (string-match "\\`text/rtf\\'" type)))
1044                             "inline"
1045                           "attachment")))
1046   (let ((disposition (completing-read
1047                       (format "Disposition (default %s): " default)
1048                       '(("attachment") ("inline") (""))
1049                       nil t nil nil default)))
1050     (if (not (equal disposition ""))
1051         disposition
1052       default)))
1053
1054 (defun mml-quote-region (beg end)
1055   "Quote the MML tags in the region."
1056   (interactive "r")
1057   (save-excursion
1058     (save-restriction
1059       ;; Temporarily narrow the region to defend from changes
1060       ;; invalidating END.
1061       (narrow-to-region beg end)
1062       (goto-char (point-min))
1063       ;; Quote parts.
1064       (while (re-search-forward
1065               "<#!*/?\\(multipart\\|part\\|external\\|mml\\)" nil t)
1066         ;; Insert ! after the #.
1067         (goto-char (+ (match-beginning 0) 2))
1068         (insert "!")))))
1069
1070 (defun mml-insert-tag (name &rest plist)
1071   "Insert an MML tag described by NAME and PLIST."
1072   (when (symbolp name)
1073     (setq name (symbol-name name)))
1074   (insert "<#" name)
1075   (while plist
1076     (let ((key (pop plist))
1077           (value (pop plist)))
1078       (when value
1079         ;; Quote VALUE if it contains suspicious characters.
1080         (when (string-match "[\"'\\~/*;() \t\n]" value)
1081           (setq value (with-output-to-string
1082                         (let (print-escape-nonascii)
1083                           (prin1 value)))))
1084         (insert (format " %s=%s" key value)))))
1085   (insert ">\n"))
1086
1087 (defun mml-insert-empty-tag (name &rest plist)
1088   "Insert an empty MML tag described by NAME and PLIST."
1089   (when (symbolp name)
1090     (setq name (symbol-name name)))
1091   (apply #'mml-insert-tag name plist)
1092   (insert "<#/" name ">\n"))
1093
1094 ;;; Attachment functions.
1095
1096 (defcustom mml-dnd-protocol-alist
1097   '(("^file:///" . mml-dnd-attach-file)
1098     ("^file://"  . dnd-open-file)
1099     ("^file:"    . mml-dnd-attach-file))
1100   "The functions to call when a drop in `mml-mode' is made.
1101 See `dnd-protocol-alist' for more information.  When nil, behave
1102 as in other buffers."
1103   :type '(choice (repeat (cons (regexp) (function)))
1104                  (const :tag "Behave as in other buffers" nil))
1105   :version "22.1" ;; Gnus 5.10.9
1106   :group 'message)
1107
1108 (defcustom mml-dnd-attach-options nil
1109   "Which options should be queried when attaching a file via drag and drop.
1110
1111 If it is a list, valid members are `type', `description' and
1112 `disposition'.  `disposition' implies `type'.  If it is nil,
1113 don't ask for options.  If it is t, ask the user whether or not
1114 to specify options."
1115   :type '(choice
1116           (const :tag "Non" nil)
1117           (const :tag "Query" t)
1118           (list :value (type description disposition)
1119            (set :inline t
1120                 (const type)
1121                 (const description)
1122                 (const disposition))))
1123   :version "22.1" ;; Gnus 5.10.9
1124   :group 'message)
1125
1126 (defun mml-attach-file (file &optional type description disposition)
1127   "Attach a file to the outgoing MIME message.
1128 The file is not inserted or encoded until you send the message with
1129 `\\[message-send-and-exit]' or `\\[message-send]'.
1130
1131 FILE is the name of the file to attach.  TYPE is its
1132 content-type, a string of the form \"type/subtype\".  DESCRIPTION
1133 is a one-line description of the attachment.  The DISPOSITION
1134 specifies how the attachment is intended to be displayed.  It can
1135 be either \"inline\" (displayed automatically within the message
1136 body) or \"attachment\" (separate from the body)."
1137   (interactive
1138    (let* ((file (mml-minibuffer-read-file "Attach file: "))
1139           (type (mml-minibuffer-read-type file))
1140           (description (mml-minibuffer-read-description))
1141           (disposition (mml-minibuffer-read-disposition type)))
1142      (list file type description disposition)))
1143   (save-excursion
1144     (unless (message-in-body-p) (goto-char (point-max)))
1145     (mml-insert-empty-tag 'part
1146                           'type type
1147                           'filename file
1148                           'disposition (or disposition "attachment")
1149                           'description description)))
1150
1151 (defun mml-dnd-attach-file (uri action)
1152   "Attach a drag and drop file.
1153
1154 Ask for type, description or disposition according to
1155 `mml-dnd-attach-options'."
1156   (let ((file (dnd-get-local-file-name uri t)))
1157     (when (and file (file-regular-p file))
1158       (let ((mml-dnd-attach-options mml-dnd-attach-options)
1159             type description disposition)
1160         (setq mml-dnd-attach-options
1161               (when (and (eq mml-dnd-attach-options t)
1162                          (not
1163                           (y-or-n-p
1164                            "Use default type, disposition and description? ")))
1165                 '(type description disposition)))
1166         (when (or (memq 'type mml-dnd-attach-options)
1167                   (memq 'disposition mml-dnd-attach-options))
1168           (setq type (mml-minibuffer-read-type file)))
1169         (when (memq 'description mml-dnd-attach-options)
1170           (setq description (mml-minibuffer-read-description)))
1171         (when (memq 'disposition mml-dnd-attach-options)
1172           (setq disposition (mml-minibuffer-read-disposition type)))
1173         (mml-attach-file file type description disposition)))))
1174
1175 (defun mml-attach-buffer (buffer &optional type description)
1176   "Attach a buffer to the outgoing MIME message.
1177 See `mml-attach-file' for details of operation."
1178   (interactive
1179    (let* ((buffer (read-buffer "Attach buffer: "))
1180           (type (mml-minibuffer-read-type buffer "text/plain"))
1181           (description (mml-minibuffer-read-description)))
1182      (list buffer type description)))
1183   (save-excursion
1184     (unless (message-in-body-p) (goto-char (point-max)))
1185     (mml-insert-empty-tag 'part 'type type 'buffer buffer
1186                           'disposition "attachment"
1187                           'description description)))
1188
1189 (defun mml-attach-external (file &optional type description)
1190   "Attach an external file into the buffer.
1191 FILE is an ange-ftp/efs specification of the part location.
1192 TYPE is the MIME type to use."
1193   (interactive
1194    (let* ((file (mml-minibuffer-read-file "Attach external file: "))
1195           (type (mml-minibuffer-read-type file))
1196           (description (mml-minibuffer-read-description)))
1197      (list file type description)))
1198   (save-excursion
1199     (unless (message-in-body-p) (goto-char (point-max)))
1200     (mml-insert-empty-tag 'external 'type type 'name file
1201                           'disposition "attachment" 'description description)))
1202
1203 (defun mml-insert-multipart (&optional type)
1204   (interactive (list (completing-read "Multipart type (default mixed): "
1205                                       '(("mixed") ("alternative") ("digest") ("parallel")
1206                                         ("signed") ("encrypted"))
1207                                       nil nil "mixed")))
1208   (or type
1209       (setq type "mixed"))
1210   (mml-insert-empty-tag "multipart" 'type type)
1211   (forward-line -1))
1212
1213 (defun mml-insert-part (&optional type)
1214   (interactive
1215    (list (mml-minibuffer-read-type "")))
1216   (mml-insert-tag 'part 'type type 'disposition "inline")
1217   (forward-line -1))
1218
1219 (defun mml-preview-insert-mail-followup-to ()
1220   "Insert a Mail-Followup-To header before previewing an article.
1221 Should be adopted if code in `message-send-mail' is changed."
1222   (when (and (message-mail-p)
1223              (message-subscribed-p)
1224              (not (mail-fetch-field "mail-followup-to"))
1225              (message-make-mail-followup-to))
1226     (message-position-on-field "Mail-Followup-To" "X-Draft-From")
1227     (insert (message-make-mail-followup-to))))
1228
1229 (defun mml-preview (&optional raw)
1230   "Display current buffer with Gnus, in a new buffer.
1231 If RAW, display a raw encoded MIME message."
1232   (interactive "P")
1233   (save-excursion
1234     (let* ((buf (current-buffer))
1235            (message-options message-options)
1236            (message-this-is-mail (message-mail-p))
1237            (message-this-is-news (message-news-p))
1238            (message-posting-charset (or (gnus-setup-posting-charset
1239                                          (save-restriction
1240                                            (message-narrow-to-headers-or-head)
1241                                            (message-fetch-field "Newsgroups")))
1242                                         message-posting-charset)))
1243       (message-options-set-recipient)
1244       (pop-to-buffer (generate-new-buffer
1245                       (concat (if raw "*Raw MIME preview of "
1246                                 "*MIME preview of ") (buffer-name))))
1247       (when (boundp 'gnus-buffers)
1248         (push (current-buffer) gnus-buffers))
1249       (erase-buffer)
1250       (insert-buffer-substring buf)
1251       (mml-preview-insert-mail-followup-to)
1252       (let ((message-deletable-headers (if (message-news-p)
1253                                            nil
1254                                          message-deletable-headers)))
1255         (message-generate-headers
1256          (copy-sequence (if (message-news-p)
1257                             message-required-news-headers
1258                           message-required-mail-headers))))
1259       (if (re-search-forward
1260            (concat "^" (regexp-quote mail-header-separator) "\n") nil t)
1261           (replace-match "\n"))
1262       (let ((mail-header-separator ""));; mail-header-separator is removed.
1263         (mml-to-mime))
1264       (if raw
1265           (when (fboundp 'set-buffer-multibyte)
1266             (let ((s (buffer-string)))
1267               ;; Insert the content into unibyte buffer.
1268               (erase-buffer)
1269               (mm-disable-multibyte)
1270               (insert s)))
1271         (let ((gnus-newsgroup-charset (car message-posting-charset))
1272               gnus-article-prepare-hook gnus-original-article-buffer)
1273           (run-hooks 'gnus-article-decode-hook)
1274           (let ((gnus-newsgroup-name "dummy")
1275                 (gnus-newsrc-hashtb (or gnus-newsrc-hashtb
1276                                         (gnus-make-hashtable 5))))
1277             (gnus-article-prepare-display))))
1278       ;; Disable article-mode-map.
1279       (use-local-map nil)
1280       (gnus-make-local-hook 'kill-buffer-hook)
1281       (add-hook 'kill-buffer-hook
1282                 (lambda ()
1283                   (mm-destroy-parts gnus-article-mime-handles)) nil t)
1284       (setq buffer-read-only t)
1285       (local-set-key "q" (lambda () (interactive) (kill-buffer nil)))
1286       (local-set-key "=" (lambda () (interactive) (delete-other-windows)))
1287       (local-set-key "\r"
1288                      (lambda ()
1289                        (interactive)
1290                        (widget-button-press (point))))
1291       (local-set-key gnus-mouse-2
1292                      (lambda (event)
1293                        (interactive "@e")
1294                        (widget-button-press (widget-event-point event) event)))
1295       (goto-char (point-min)))))
1296
1297 (defun mml-validate ()
1298   "Validate the current MML document."
1299   (interactive)
1300   (mml-parse))
1301
1302 (defun mml-tweak-part (cont)
1303   "Tweak a MML part."
1304   (let ((tweak (cdr (assq 'tweak cont)))
1305         func)
1306     (cond
1307      (tweak
1308       (setq func
1309             (or (cdr (assoc tweak mml-tweak-function-alist))
1310                 (intern tweak))))
1311      (mml-tweak-type-alist
1312       (let ((alist mml-tweak-type-alist)
1313             (type (or (cdr (assq 'type cont)) "text/plain")))
1314         (while alist
1315           (if (string-match (caar alist) type)
1316               (setq func (cdar alist)
1317                     alist nil)
1318             (setq alist (cdr alist)))))))
1319     (if func
1320         (funcall func cont)
1321       cont)
1322     (let ((alist mml-tweak-sexp-alist))
1323       (while alist
1324         (if (eval (caar alist))
1325             (funcall (cdar alist) cont))
1326         (setq alist (cdr alist)))))
1327   cont)
1328
1329 (defun mml-tweak-externalize-attachments (cont)
1330   "Tweak attached files as external parts."
1331   (let (filename-cons)
1332     (when (and (eq (car cont) 'part)
1333                (not (cdr (assq 'buffer cont)))
1334                (and (setq filename-cons (assq 'filename cont))
1335                     (not (equal (cdr (assq 'nofile cont)) "yes"))))
1336       (setcar cont 'external)
1337       (setcar filename-cons 'name))))
1338
1339 (provide 'mml)
1340
1341 ;;; arch-tag: 583c96cf-1ffe-451b-a5e5-4733ae9ddd12
1342 ;;; mml.el ends here