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, 2008 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 ;; For Emacs < 22.2.
  29 (eval-and-compile
  30   (unless (fboundp 'declare-function) (defmacro declare-function (&rest r))))
  31
  32 (require 'mm-util)
  33 (require 'mm-bodies)
  34 (require 'mm-encode)
  35 (require 'mm-decode)
  36 (require 'mml-sec)
  37 (eval-when-compile (require 'cl))
  38
  39 (eval-and-compile
  40   (autoload 'message-make-message-id "message")
  41   (autoload 'gnus-setup-posting-charset "gnus-msg")
  42   (autoload 'gnus-make-local-hook "gnus-util")
  43   (autoload 'message-fetch-field "message")
  44   (autoload 'message-mark-active-p "message")
  45   (autoload 'message-info "message")
  46   (autoload 'fill-flowed-encode "flow-fill")
  47   (autoload 'message-posting-charset "message")
  48   (autoload 'dnd-get-local-file-name "dnd"))
  49
  50 (autoload 'message-options-set    "message")
  51 (autoload 'message-narrow-to-head "message")
  52 (autoload 'message-in-body-p      "message")
  53 (autoload 'message-mail-p         "message")
  54
  55 (defvar gnus-article-mime-handles)
  56 (defvar gnus-mouse-2)
  57 (defvar gnus-newsrc-hashtb)
  58 (defvar message-default-charset)
  59 (defvar message-deletable-headers)
  60 (defvar message-options)
  61 (defvar message-posting-charset)
  62 (defvar message-required-mail-headers)
  63 (defvar message-required-news-headers)
  64 (defvar dnd-protocol-alist)
  65 (defvar mml-dnd-protocol-alist)
  66
  67 (defcustom mml-content-type-parameters
  68   '(name access-type expiration size permission format)
  69   "*A list of acceptable parameters in MML tag.
  70 These parameters are generated in Content-Type header if exists."
  71   :version "22.1"
  72   :type '(repeat (symbol :tag "Parameter"))
  73   :group 'message)
  74
  75 (defcustom mml-content-disposition-parameters
  76   '(filename creation-date modification-date read-date)
  77   "*A list of acceptable parameters in MML tag.
  78 These parameters are generated in Content-Disposition header if exists."
  79   :version "22.1"
  80   :type '(repeat (symbol :tag "Parameter"))
  81   :group 'message)
  82
  83 (defcustom mml-content-disposition-alist
  84   '((text (rtf . "attachment") (t . "inline"))
  85     (t . "attachment"))
  86   "Alist of MIME types or regexps matching file names and default dispositions.
  87 Each element should be one of the following three forms:
  88
  89   (REGEXP . DISPOSITION)
  90   (SUPERTYPE (SUBTYPE . DISPOSITION) (SUBTYPE . DISPOSITION)...)
  91   (TYPE . DISPOSITION)
  92
  93 Where REGEXP is a string which matches the file name (if any) of an
  94 attachment, SUPERTYPE, SUBTYPE and TYPE should be symbols which are a
  95 MIME supertype (e.g., text), a MIME subtype (e.g., plain) and a MIME
  96 type (e.g., text/plain) respectively, and DISPOSITION should be either
  97 the string \"attachment\" or the string \"inline\".  The value t for
  98 SUPERTYPE, SUBTYPE or TYPE matches any of those types.  The first
  99 match found will be used."
 100   :version "23.0" ;; No Gnus
 101   :type (let ((dispositions '(radio :format "DISPOSITION: %v"
 102                                     :value "attachment"
 103                                     (const :format "%v " "attachment")
 104                                     (const :format "%v\n" "inline"))))
 105           `(repeat
 106             :offset 0
 107             (choice :format "%[Value Menu%]%v"
 108                     (cons :tag "(REGEXP . DISPOSITION)" :extra-offset 4
 109                           (regexp :tag "REGEXP" :value ".*")
 110                           ,dispositions)
 111                     (cons :tag "(SUPERTYPE (SUBTYPE . DISPOSITION)...)"
 112                           :indent 0
 113                           (symbol :tag "    SUPERTYPE" :value text)
 114                           (repeat :format "%v%i\n" :offset 0 :extra-offset 4
 115                                   (cons :format "%v" :extra-offset 5
 116                                         (symbol :tag "SUBTYPE" :value t)
 117                                         ,dispositions)))
 118                     (cons :tag "(TYPE . DISPOSITION)" :extra-offset 4
 119                           (symbol :tag "TYPE" :value t)
 120                           ,dispositions))))
 121   :group 'message)
 122
 123 (defcustom mml-insert-mime-headers-always nil
 124   "If non-nil, always put Content-Type: text/plain at top of empty parts.
 125 It is necessary to work against a bug in certain clients."
 126   :version "22.1"
 127   :type 'boolean
 128   :group 'message)
 129
 130 (defvar mml-tweak-type-alist nil
 131   "A list of (TYPE . FUNCTION) for tweaking MML parts.
 132 TYPE is a string containing a regexp to match the MIME type.  FUNCTION
 133 is a Lisp function which is called with the MML handle to tweak the
 134 part.  This variable is used only when no TWEAK parameter exists in
 135 the MML handle.")
 136
 137 (defvar mml-tweak-function-alist nil
 138   "A list of (NAME . FUNCTION) for tweaking MML parts.
 139 NAME is a string containing the name of the TWEAK parameter in the MML
 140 handle.  FUNCTION is a Lisp function which is called with the MML
 141 handle to tweak the part.")
 142
 143 (defvar mml-tweak-sexp-alist
 144   '((mml-externalize-attachments . mml-tweak-externalize-attachments))
 145   "A list of (SEXP . FUNCTION) for tweaking MML parts.
 146 SEXP is an s-expression.  If the evaluation of SEXP is non-nil, FUNCTION
 147 is called.  FUNCTION is a Lisp function which is called with the MML
 148 handle to tweak the part.")
 149
 150 (defvar mml-externalize-attachments nil
 151   "*If non-nil, local-file attachments are generated as external parts.")
 152
 153 (defvar mml-generate-multipart-alist nil
 154   "*Alist of multipart generation functions.
 155 Each entry has the form (NAME . FUNCTION), where
 156 NAME is a string containing the name of the part (without the
 157 leading \"/multipart/\"),
 158 FUNCTION is a Lisp function which is called to generate the part.
 159
 160 The Lisp function has to supply the appropriate MIME headers and the
 161 contents of this part.")
 162
 163 (defvar mml-syntax-table
 164   (let ((table (copy-syntax-table emacs-lisp-mode-syntax-table)))
 165     (modify-syntax-entry ?\\ "/" table)
 166     (modify-syntax-entry ?< "(" table)
 167     (modify-syntax-entry ?> ")" table)
 168     (modify-syntax-entry ?@ "w" table)
 169     (modify-syntax-entry ?/ "w" table)
 170     (modify-syntax-entry ?= " " table)
 171     (modify-syntax-entry ?* " " table)
 172     (modify-syntax-entry ?\; " " table)
 173     (modify-syntax-entry ?\' " " table)
 174     table))
 175
 176 (defvar mml-boundary-function 'mml-make-boundary
 177   "A function called to suggest a boundary.
 178 The function may be called several times, and should try to make a new
 179 suggestion each time.  The function is called with one parameter,
 180 which is a number that says how many times the function has been
 181 called for this message.")
 182
 183 (defvar mml-confirmation-set nil
 184   "A list of symbols, each of which disables some warning.
 185 `unknown-encoding': always send messages contain characters with
 186 unknown encoding; `use-ascii': always use ASCII for those characters
 187 with unknown encoding; `multipart': always send messages with more than
 188 one charsets.")
 189
 190 (defvar mml-generate-default-type "text/plain"
 191   "Content type by which the Content-Type header can be omitted.
 192 The Content-Type header will not be put in the MIME part if the type
 193 equals the value and there's no parameter (e.g. charset, format, etc.)
 194 and `mml-insert-mime-headers-always' is nil.  The value will be bound
 195 to \"message/rfc822\" when encoding an article to be forwarded as a MIME
 196 part.  This is for the internal use, you should never modify the value.")
 197
 198 (defvar mml-buffer-list nil)
 199
 200 (defun mml-generate-new-buffer (name)
 201   (let ((buf (generate-new-buffer name)))
 202     (push buf mml-buffer-list)
 203     buf))
 204
 205 (defun mml-destroy-buffers ()
 206   (let (kill-buffer-hook)
 207     (mapc 'kill-buffer mml-buffer-list)
 208     (setq mml-buffer-list nil)))
 209
 210 (defun mml-parse ()
 211   "Parse the current buffer as an MML document."
 212   (save-excursion
 213     (goto-char (point-min))
 214     (with-syntax-table mml-syntax-table
 215       (mml-parse-1))))
 216
 217 (defun mml-parse-1 ()
 218   "Parse the current buffer as an MML document."
 219   (let (struct tag point contents charsets warn use-ascii no-markup-p raw)
 220     (while (and (not (eobp))
 221                 (not (looking-at "<#/multipart")))
 222       (cond
 223        ((looking-at "<#secure")
 224         ;; The secure part is essentially a meta-meta tag, which
 225         ;; expands to either a part tag if there are no other parts in
 226         ;; the document or a multipart tag if there are other parts
 227         ;; included in the message
 228         (let* (secure-mode
 229                (taginfo (mml-read-tag))
 230                (keyfile (cdr (assq 'keyfile taginfo)))
 231                (certfile (cdr (assq 'certfile taginfo)))
 232                (recipients (cdr (assq 'recipients taginfo)))
 233                (sender (cdr (assq 'sender taginfo)))
 234                (location (cdr (assq 'tag-location taginfo)))
 235                (mode (cdr (assq 'mode taginfo)))
 236                (method (cdr (assq 'method taginfo)))
 237                tags)
 238           (save-excursion
 239             (if (re-search-forward
 240                  "<#/?\\(multipart\\|part\\|external\\|mml\\)." nil t)
 241                 (setq secure-mode "multipart")
 242               (setq secure-mode "part")))
 243           (save-excursion
 244             (goto-char location)
 245             (re-search-forward "<#secure[^\n]*>\n"))
 246           (delete-region (match-beginning 0) (match-end 0))
 247           (cond ((string= mode "sign")
 248                  (setq tags (list "sign" method)))
 249                 ((string= mode "encrypt")
 250                  (setq tags (list "encrypt" method)))
 251                 ((string= mode "signencrypt")
 252                  (setq tags (list "sign" method "encrypt" method))))
 253           (eval `(mml-insert-tag ,secure-mode
 254                                  ,@tags
 255                                  ,(if keyfile "keyfile")
 256                                  ,keyfile
 257                                  ,(if certfile "certfile")
 258                                  ,certfile
 259                                  ,(if recipients "recipients")
 260                                  ,recipients
 261                                  ,(if sender "sender")
 262                                  ,sender))
 263           ;; restart the parse
 264           (goto-char location)))
 265        ((looking-at "<#multipart")
 266         (push (nconc (mml-read-tag) (mml-parse-1)) struct))
 267        ((looking-at "<#external")
 268         (push (nconc (mml-read-tag) (list (cons 'contents (mml-read-part))))
 269               struct))
 270        (t
 271         (if (or (looking-at "<#part") (looking-at "<#mml"))
 272             (setq tag (mml-read-tag)
 273                   no-markup-p nil
 274                   warn nil)
 275           (setq tag (list 'part '(type . "text/plain"))
 276                 no-markup-p t
 277                 warn t))
 278         (setq raw (cdr (assq 'raw tag))
 279               point (point)
 280               contents (mml-read-part (eq 'mml (car tag)))
 281               charsets (cond
 282                         (raw nil)
 283                         ((assq 'charset tag)
 284                          (list
 285                           (intern (downcase (cdr (assq 'charset tag))))))
 286                         (t
 287                          (mm-find-mime-charset-region point (point)
 288                                                       mm-hack-charsets))))
 289         (when (and (not raw) (memq nil charsets))
 290           (if (or (memq 'unknown-encoding mml-confirmation-set)
 291                   (message-options-get 'unknown-encoding)
 292                   (and (y-or-n-p "\
 293 Message contains characters with unknown encoding.  Really send? ")
 294                        (message-options-set 'unknown-encoding t)))
 295               (if (setq use-ascii
 296                         (or (memq 'use-ascii mml-confirmation-set)
 297                             (message-options-get 'use-ascii)
 298                             (and (y-or-n-p "Use ASCII as charset? ")
 299                                  (message-options-set 'use-ascii t))))
 300                   (setq charsets (delq nil charsets))
 301                 (setq warn nil))
 302             (error "Edit your message to remove those characters")))
 303         (if (or raw
 304                 (eq 'mml (car tag))
 305                 (< (length charsets) 2))
 306             (if (or (not no-markup-p)
 307                     (string-match "[^ \t\r\n]" contents))
 308                 ;; Don't create blank parts.
 309                 (push (nconc tag (list (cons 'contents contents)))
 310                       struct))
 311           (let ((nstruct (mml-parse-singlepart-with-multiple-charsets
 312                           tag point (point) use-ascii)))
 313             (when (and warn
 314                        (not (memq 'multipart mml-confirmation-set))
 315                        (not (message-options-get 'multipart))
 316                        (not (and (y-or-n-p (format "\
 317 A message part needs to be split into %d charset parts.  Really send? "
 318                                                    (length nstruct)))
 319                                  (message-options-set 'multipart t))))
 320               (error "Edit your message to use only one charset"))
 321             (setq struct (nconc nstruct struct)))))))
 322     (unless (eobp)
 323       (forward-line 1))
 324     (nreverse struct)))
 325
 326 (defun mml-parse-singlepart-with-multiple-charsets
 327   (orig-tag beg end &optional use-ascii)
 328   (save-excursion
 329     (save-restriction
 330       (narrow-to-region beg end)
 331       (goto-char (point-min))
 332       (let ((current (or (mm-mime-charset (mm-charset-after))
 333                          (and use-ascii 'us-ascii)))
 334             charset struct space newline paragraph)
 335         (while (not (eobp))
 336           (setq charset (mm-mime-charset (mm-charset-after)))
 337           (cond
 338            ;; The charset remains the same.
 339            ((eq charset 'us-ascii))
 340            ((or (and use-ascii (not charset))
 341                 (eq charset current))
 342             (setq space nil
 343                   newline nil
 344                   paragraph nil))
 345            ;; The initial charset was ascii.
 346            ((eq current 'us-ascii)
 347             (setq current charset
 348                   space nil
 349                   newline nil
 350                   paragraph nil))
 351            ;; We have a change in charsets.
 352            (t
 353             (push (append
 354                    orig-tag
 355                    (list (cons 'contents
 356                                (buffer-substring-no-properties
 357                                 beg (or paragraph newline space (point))))))
 358                   struct)
 359             (setq beg (or paragraph newline space (point))
 360                   current charset
 361                   space nil
 362                   newline nil
 363                   paragraph nil)))
 364           ;; Compute places where it might be nice to break the part.
 365           (cond
 366            ((memq (following-char) '(?  ?\t))
 367             (setq space (1+ (point))))
 368            ((and (eq (following-char) ?\n)
 369                  (not (bobp))
 370                  (eq (char-after (1- (point))) ?\n))
 371             (setq paragraph (point)))
 372            ((eq (following-char) ?\n)
 373             (setq newline (1+ (point)))))
 374           (forward-char 1))
 375         ;; Do the final part.
 376         (unless (= beg (point))
 377           (push (append orig-tag
 378                         (list (cons 'contents
 379                                     (buffer-substring-no-properties
 380                                      beg (point)))))
 381                 struct))
 382         struct))))
 383
 384 (defun mml-read-tag ()
 385   "Read a tag and return the contents."
 386   (let ((orig-point (point))
 387         contents name elem val)
 388     (forward-char 2)
 389     (setq name (buffer-substring-no-properties
 390                 (point) (progn (forward-sexp 1) (point))))
 391     (skip-chars-forward " \t\n")
 392     (while (not (looking-at ">[ \t]*\n?"))
 393       (setq elem (buffer-substring-no-properties
 394                   (point) (progn (forward-sexp 1) (point))))
 395       (skip-chars-forward "= \t\n")
 396       (setq val (buffer-substring-no-properties
 397                  (point) (progn (forward-sexp 1) (point))))
 398       (when (string-match "^\"\\(.*\\)\"$" val)
 399         (setq val (match-string 1 val)))
 400       (push (cons (intern elem) val) contents)
 401       (skip-chars-forward " \t\n"))
 402     (goto-char (match-end 0))
 403     ;; Don't skip the leading space.
 404     ;;(skip-chars-forward " \t\n")
 405     ;; Put the tag location into the returned contents
 406     (setq contents (append (list (cons 'tag-location orig-point)) contents))
 407     (cons (intern name) (nreverse contents))))
 408
 409 (defun mml-buffer-substring-no-properties-except-hard-newlines (start end)
 410   (let ((str (buffer-substring-no-properties start end))
 411         (bufstart start) tmp)
 412     (while (setq tmp (text-property-any start end 'hard 't))
 413       (set-text-properties (- tmp bufstart) (- tmp bufstart -1)
 414                            '(hard t) str)
 415       (setq start (1+ tmp)))
 416     str))
 417
 418 (defun mml-read-part (&optional mml)
 419   "Return the buffer up till the next part, multipart or closing part or multipart.
 420 If MML is non-nil, return the buffer up till the correspondent mml tag."
 421   (let ((beg (point)) (count 1))
 422     ;; If the tag ended at the end of the line, we go to the next line.
 423     (when (looking-at "[ \t]*\n")
 424       (forward-line 1))
 425     (if mml
 426         (progn
 427           (while (and (> count 0) (not (eobp)))
 428             (if (re-search-forward "<#\\(/\\)?mml." nil t)
 429                 (setq count (+ count (if (match-beginning 1) -1 1)))
 430               (goto-char (point-max))))
 431           (mml-buffer-substring-no-properties-except-hard-newlines
 432            beg (if (> count 0)
 433                    (point)
 434                  (match-beginning 0))))
 435       (if (re-search-forward
 436            "<#\\(/\\)?\\(multipart\\|part\\|external\\|mml\\)." nil t)
 437           (prog1
 438               (mml-buffer-substring-no-properties-except-hard-newlines
 439                beg (match-beginning 0))
 440             (if (or (not (match-beginning 1))
 441                     (equal (match-string 2) "multipart"))
 442                 (goto-char (match-beginning 0))
 443               (when (looking-at "[ \t]*\n")
 444                 (forward-line 1))))
 445         (mml-buffer-substring-no-properties-except-hard-newlines
 446          beg (goto-char (point-max)))))))
 447
 448 (defvar mml-boundary nil)
 449 (defvar mml-base-boundary "-=-=")
 450 (defvar mml-multipart-number 0)
 451
 452 (defun mml-generate-mime ()
 453   "Generate a MIME message based on the current MML document."
 454   (let ((cont (mml-parse))
 455         (mml-multipart-number mml-multipart-number))
 456     (if (not cont)
 457         nil
 458       (mm-with-multibyte-buffer
 459         (if (and (consp (car cont))
 460                  (= (length cont) 1))
 461             (mml-generate-mime-1 (car cont))
 462           (mml-generate-mime-1 (nconc (list 'multipart '(type . "mixed"))
 463                                       cont)))
 464         (buffer-string)))))
 465
 466 (defun mml-generate-mime-1 (cont)
 467   (let ((mm-use-ultra-safe-encoding
 468          (or mm-use-ultra-safe-encoding (assq 'sign cont))))
 469     (save-restriction
 470       (narrow-to-region (point) (point))
 471       (mml-tweak-part cont)
 472       (cond
 473        ((or (eq (car cont) 'part) (eq (car cont) 'mml))
 474         (let* ((raw (cdr (assq 'raw cont)))
 475                (filename (cdr (assq 'filename cont)))
 476                (type (or (cdr (assq 'type cont))
 477                          (if filename
 478                              (or (mm-default-file-encoding filename)
 479                                  "application/octet-stream")
 480                            "text/plain")))
 481                (charset (cdr (assq 'charset cont)))
 482                (coding (mm-charset-to-coding-system charset))
 483                encoding flowed coded)
 484           (cond ((eq coding 'ascii)
 485                  (setq charset nil
 486                        coding nil))
 487                 (charset
 488                  (setq charset (intern (downcase charset)))))
 489           (if (and (not raw)
 490                    (member (car (split-string type "/")) '("text" "message")))
 491               (progn
 492                 (with-temp-buffer
 493                   (cond
 494                    ((cdr (assq 'buffer cont))
 495                     (insert-buffer-substring (cdr (assq 'buffer cont))))
 496                    ((and filename
 497                          (not (equal (cdr (assq 'nofile cont)) "yes")))
 498                     (let ((coding-system-for-read coding))
 499                       (mm-insert-file-contents filename)))
 500                    ((eq 'mml (car cont))
 501                     (insert (cdr (assq 'contents cont))))
 502                    (t
 503                     (save-restriction
 504                       (narrow-to-region (point) (point))
 505                       (insert (cdr (assq 'contents cont)))
 506                       ;; Remove quotes from quoted tags.
 507                       (goto-char (point-min))
 508                       (while (re-search-forward
 509                               "<#!+/?\\(part\\|multipart\\|external\\|mml\\)"
 510                               nil t)
 511                         (delete-region (+ (match-beginning 0) 2)
 512                                        (+ (match-beginning 0) 3))))))
 513                   (cond
 514                    ((eq (car cont) 'mml)
 515                     (let ((mml-boundary (mml-compute-boundary cont))
 516                           ;; It is necessary for the case where this
 517                           ;; function is called recursively since
 518                           ;; `m-g-d-t' will be bound to "message/rfc822"
 519                           ;; when encoding an article to be forwarded.
 520                           (mml-generate-default-type "text/plain"))
 521                       (mml-to-mime))
 522                     (let ((mm-7bit-chars (concat mm-7bit-chars "\x1b")))
 523                       ;; ignore 0x1b, it is part of iso-2022-jp
 524                       (setq encoding (mm-body-7-or-8))))
 525                    ((string= (car (split-string type "/")) "message")
 526                     (let ((mm-7bit-chars (concat mm-7bit-chars "\x1b")))
 527                       ;; ignore 0x1b, it is part of iso-2022-jp
 528                       (setq encoding (mm-body-7-or-8))))
 529                    (t
 530                     ;; Only perform format=flowed filling on text/plain
 531                     ;; parts where there either isn't a format parameter
 532                     ;; in the mml tag or it says "flowed" and there
 533                     ;; actually are hard newlines in the text.
 534                     (let (use-hard-newlines)
 535                       (when (and (string= type "text/plain")
 536                                  (not (string= (cdr (assq 'sign cont)) "pgp"))
 537                                  (or (null (assq 'format cont))
 538                                      (string= (cdr (assq 'format cont))
 539                                               "flowed"))
 540                                  (setq use-hard-newlines
 541                                        (text-property-any
 542                                         (point-min) (point-max) 'hard 't)))
 543                         (fill-flowed-encode)
 544                         ;; Indicate that `mml-insert-mime-headers' should
 545                         ;; insert a "; format=flowed" string unless the
 546                         ;; user has already specified it.
 547                         (setq flowed (null (assq 'format cont)))))
 548                     ;; Prefer `utf-8' for text/calendar parts.
 549                     (if (or charset
 550                             (not (string= type "text/calendar")))
 551                         (setq charset (mm-encode-body charset))
 552                       (let ((mm-coding-system-priorities
 553                              (cons 'utf-8 mm-coding-system-priorities)))
 554                         (setq charset (mm-encode-body))))
 555                     (setq encoding (mm-body-encoding
 556                                     charset (cdr (assq 'encoding cont))))))
 557                   (setq coded (buffer-string)))
 558                 (mml-insert-mime-headers cont type charset encoding flowed)
 559                 (insert "\n")
 560                 (insert coded))
 561             (mm-with-unibyte-buffer
 562               (cond
 563                ((cdr (assq 'buffer cont))
 564                 (insert (mm-string-as-unibyte
 565                          (with-current-buffer (cdr (assq 'buffer cont))
 566                            (buffer-string)))))
 567                ((and filename
 568                      (not (equal (cdr (assq 'nofile cont)) "yes")))
 569                 (let ((coding-system-for-read mm-binary-coding-system))
 570                   (mm-insert-file-contents filename nil nil nil nil t))
 571                 (unless charset
 572                   (setq charset (mm-coding-system-to-mime-charset
 573                                  (mm-find-buffer-file-coding-system
 574                                   filename)))))
 575                (t
 576                 (let ((contents (cdr (assq 'contents cont))))
 577                   (if (if (featurep 'xemacs)
 578                           (string-match "[^\000-\377]" contents)
 579                         (mm-multibyte-string-p contents))
 580                       (progn
 581                         (mm-enable-multibyte)
 582                         (insert contents)
 583                         (unless raw
 584                           (setq charset (mm-encode-body charset))))
 585                     (insert contents)))))
 586               (setq encoding (mm-encode-buffer type)
 587                     coded (mm-string-as-multibyte (buffer-string))))
 588             (mml-insert-mime-headers cont type charset encoding nil)
 589             (insert "\n" coded))))
 590        ((eq (car cont) 'external)
 591         (insert "Content-Type: message/external-body")
 592         (let ((parameters (mml-parameter-string
 593                            cont '(expiration size permission)))
 594               (name (cdr (assq 'name cont)))
 595               (url (cdr (assq 'url cont))))
 596           (when name
 597             (setq name (mml-parse-file-name name))
 598             (if (stringp name)
 599                 (mml-insert-parameter
 600                  (mail-header-encode-parameter "name" name)
 601                  "access-type=local-file")
 602               (mml-insert-parameter
 603                (mail-header-encode-parameter
 604                 "name" (file-name-nondirectory (nth 2 name)))
 605                (mail-header-encode-parameter "site" (nth 1 name))
 606                (mail-header-encode-parameter
 607                 "directory" (file-name-directory (nth 2 name))))
 608               (mml-insert-parameter
 609                (concat "access-type="
 610                        (if (member (nth 0 name) '("ftp@" "anonymous@"))
 611                            "anon-ftp"
 612                          "ftp")))))
 613           (when url
 614             (mml-insert-parameter
 615              (mail-header-encode-parameter "url" url)
 616              "access-type=url"))
 617           (when parameters
 618             (mml-insert-parameter-string
 619              cont '(expiration size permission)))
 620           (insert "\n\n")
 621           (insert "Content-Type: "
 622                   (or (cdr (assq 'type cont))
 623                       (if name
 624                           (or (mm-default-file-encoding name)
 625                               "application/octet-stream")
 626                         "text/plain"))
 627                   "\n")
 628           (insert "Content-ID: " (message-make-message-id) "\n")
 629           (insert "Content-Transfer-Encoding: "
 630                   (or (cdr (assq 'encoding cont)) "binary"))
 631           (insert "\n\n")
 632           (insert (or (cdr (assq 'contents cont))))
 633           (insert "\n")))
 634        ((eq (car cont) 'multipart)
 635         (let* ((type (or (cdr (assq 'type cont)) "mixed"))
 636                (mml-generate-default-type (if (equal type "digest")
 637                                               "message/rfc822"
 638                                             "text/plain"))
 639                (handler (assoc type mml-generate-multipart-alist)))
 640           (if handler
 641               (funcall (cdr handler) cont)
 642             ;; No specific handler.  Use default one.
 643             (let ((mml-boundary (mml-compute-boundary cont)))
 644               (insert (format "Content-Type: multipart/%s; boundary=\"%s\""
 645                               type mml-boundary)
 646                       (if (cdr (assq 'start cont))
 647                           (format "; start=\"%s\"\n" (cdr (assq 'start cont)))
 648                         "\n"))
 649               (let ((cont cont) part)
 650                 (while (setq part (pop cont))
 651                   ;; Skip `multipart' and attributes.
 652                   (when (and (consp part) (consp (cdr part)))
 653                     (insert "\n--" mml-boundary "\n")
 654                     (mml-generate-mime-1 part)
 655                     (goto-char (point-max)))))
 656               (insert "\n--" mml-boundary "--\n")))))
 657        (t
 658         (error "Invalid element: %S" cont)))
 659       ;; handle sign & encrypt tags in a semi-smart way.
 660       (let ((sign-item (assoc (cdr (assq 'sign cont)) mml-sign-alist))
 661             (encrypt-item (assoc (cdr (assq 'encrypt cont))
 662                                  mml-encrypt-alist))
 663             sender recipients)
 664         (when (or sign-item encrypt-item)
 665           (when (setq sender (cdr (assq 'sender cont)))
 666             (message-options-set 'mml-sender sender)
 667             (message-options-set 'message-sender sender))
 668           (if (setq recipients (cdr (assq 'recipients cont)))
 669               (message-options-set 'message-recipients recipients))
 670           (let ((style (mml-signencrypt-style
 671                         (first (or sign-item encrypt-item)))))
 672             ;; check if: we're both signing & encrypting, both methods
 673             ;; are the same (why would they be different?!), and that
 674             ;; the signencrypt style allows for combined operation.
 675             (if (and sign-item encrypt-item (equal (first sign-item)
 676                                                    (first encrypt-item))
 677                      (equal style 'combined))
 678                 (funcall (nth 1 encrypt-item) cont t)
 679               ;; otherwise, revert to the old behavior.
 680               (when sign-item
 681                 (funcall (nth 1 sign-item) cont))
 682               (when encrypt-item
 683                 (funcall (nth 1 encrypt-item) cont)))))))))
 684
 685 (defun mml-compute-boundary (cont)
 686   "Return a unique boundary that does not exist in CONT."
 687   (let ((mml-boundary (funcall mml-boundary-function
 688                                (incf mml-multipart-number))))
 689     ;; This function tries again and again until it has found
 690     ;; a unique boundary.
 691     (while (not (catch 'not-unique
 692                   (mml-compute-boundary-1 cont))))
 693     mml-boundary))
 694
 695 (defun mml-compute-boundary-1 (cont)
 696   (let (filename)
 697     (cond
 698      ((eq (car cont) 'part)
 699       (with-temp-buffer
 700         (cond
 701          ((cdr (assq 'buffer cont))
 702           (insert-buffer-substring (cdr (assq 'buffer cont))))
 703          ((and (setq filename (cdr (assq 'filename cont)))
 704                (not (equal (cdr (assq 'nofile cont)) "yes")))
 705           (mm-insert-file-contents filename nil nil nil nil t))
 706          (t
 707           (insert (cdr (assq 'contents cont)))))
 708         (goto-char (point-min))
 709         (when (re-search-forward (concat "^--" (regexp-quote mml-boundary))
 710                                  nil t)
 711           (setq mml-boundary (funcall mml-boundary-function
 712                                       (incf mml-multipart-number)))
 713           (throw 'not-unique nil))))
 714      ((eq (car cont) 'multipart)
 715       (mapc 'mml-compute-boundary-1 (cddr cont))))
 716     t))
 717
 718 (defun mml-make-boundary (number)
 719   (concat (make-string (% number 60) ?=)
 720           (if (> number 17)
 721               (format "%x" number)
 722             "")
 723           mml-base-boundary))
 724
 725 (defun mml-content-disposition (type &optional filename)
 726   "Return a default disposition name suitable to TYPE or FILENAME."
 727   (let ((defs mml-content-disposition-alist)
 728         disposition def types)
 729     (while (and (not disposition) defs)
 730       (setq def (pop defs))
 731       (cond ((stringp (car def))
 732              (when (and filename
 733                         (string-match (car def) filename))
 734                (setq disposition (cdr def))))
 735             ((consp (cdr def))
 736              (when (string= (car (setq types (split-string type "/")))
 737                             (car def))
 738                (setq type (cadr types)
 739                      types (cdr def))
 740                (while (and (not disposition) types)
 741                  (setq def (pop types))
 742                  (when (or (eq (car def) t) (string= type (car def)))
 743                    (setq disposition (cdr def))))))
 744             (t
 745              (when (or (eq (car def) t) (string= type (car def)))
 746                (setq disposition (cdr def))))))
 747     (or disposition "attachment")))
 748
 749 (defun mml-insert-mime-headers (cont type charset encoding flowed)
 750   (let (parameters id disposition description)
 751     (setq parameters
 752           (mml-parameter-string
 753            cont mml-content-type-parameters))
 754     (when (or charset
 755               parameters
 756               flowed
 757               (not (equal type mml-generate-default-type))
 758               mml-insert-mime-headers-always)
 759       (when (consp charset)
 760         (error
 761          "Can't encode a part with several charsets"))
 762       (insert "Content-Type: " type)
 763       (when charset
 764         (mml-insert-parameter
 765          (mail-header-encode-parameter "charset" (symbol-name charset))))
 766       (when flowed
 767         (mml-insert-parameter "format=flowed"))
 768       (when parameters
 769         (mml-insert-parameter-string
 770          cont mml-content-type-parameters))
 771       (insert "\n"))
 772     (when (setq id (cdr (assq 'id cont)))
 773       (insert "Content-ID: " id "\n"))
 774     (setq parameters
 775           (mml-parameter-string
 776            cont mml-content-disposition-parameters))
 777     (when (or (setq disposition (cdr (assq 'disposition cont)))
 778               parameters)
 779       (insert "Content-Disposition: "
 780               (or disposition
 781                   (mml-content-disposition type (cdr (assq 'filename cont)))))
 782       (when parameters
 783         (mml-insert-parameter-string
 784          cont mml-content-disposition-parameters))
 785       (insert "\n"))
 786     (unless (eq encoding '7bit)
 787       (insert (format "Content-Transfer-Encoding: %s\n" encoding)))
 788     (when (setq description (cdr (assq 'description cont)))
 789       (insert "Content-Description: ")
 790       (setq description (prog1
 791                             (point)
 792                           (insert description "\n")))
 793       (mail-encode-encoded-word-region description (point)))))
 794
 795 (defun mml-parameter-string (cont types)
 796   (let ((string "")
 797         value type)
 798     (while (setq type (pop types))
 799       (when (setq value (cdr (assq type cont)))
 800         ;; Strip directory component from the filename parameter.
 801         (when (eq type 'filename)
 802           (setq value (file-name-nondirectory value)))
 803         (setq string (concat string "; "
 804                              (mail-header-encode-parameter
 805                               (symbol-name type) value)))))
 806     (when (not (zerop (length string)))
 807       string)))
 808
 809 (defun mml-insert-parameter-string (cont types)
 810   (let (value type)
 811     (while (setq type (pop types))
 812       (when (setq value (cdr (assq type cont)))
 813         ;; Strip directory component from the filename parameter.
 814         (when (eq type 'filename)
 815           (setq value (file-name-nondirectory value)))
 816         (mml-insert-parameter
 817          (mail-header-encode-parameter
 818           (symbol-name type) value))))))
 819
 820 (defvar ange-ftp-name-format)
 821 (defvar efs-path-regexp)
 822
 823 (defun mml-parse-file-name (path)
 824   (if (if (boundp 'efs-path-regexp)
 825           (string-match efs-path-regexp path)
 826         (if (boundp 'ange-ftp-name-format)
 827             (string-match (car ange-ftp-name-format) path)))
 828       (list (match-string 1 path) (match-string 2 path)
 829             (substring path (1+ (match-end 2))))
 830     path))
 831
 832 (defun mml-insert-buffer (buffer)
 833   "Insert BUFFER at point and quote any MML markup."
 834   (save-restriction
 835     (narrow-to-region (point) (point))
 836     (insert-buffer-substring buffer)
 837     (mml-quote-region (point-min) (point-max))
 838     (goto-char (point-max))))
 839
 840 ;;;
 841 ;;; Transforming MIME to MML
 842 ;;;
 843
 844 ;; message-narrow-to-head autoloads message.
 845 (declare-function message-remove-header "message"
 846                   (header &optional is-regexp first reverse))
 847
 848 (defun mime-to-mml (&optional handles)
 849   "Translate the current buffer (which should be a message) into MML.
 850 If HANDLES is non-nil, use it instead reparsing the buffer."
 851   ;; First decode the head.
 852   (save-restriction
 853     (message-narrow-to-head)
 854     (let ((rfc2047-quote-decoded-words-containing-tspecials t))
 855       (mail-decode-encoded-word-region (point-min) (point-max))))
 856   (unless handles
 857     (setq handles (mm-dissect-buffer t)))
 858   (goto-char (point-min))
 859   (search-forward "\n\n" nil t)
 860   (delete-region (point) (point-max))
 861   (if (stringp (car handles))
 862       (mml-insert-mime handles)
 863     (mml-insert-mime handles t))
 864   (mm-destroy-parts handles)
 865   (save-restriction
 866     (message-narrow-to-head)
 867     ;; Remove them, they are confusing.
 868     (message-remove-header "Content-Type")
 869     (message-remove-header "MIME-Version")
 870     (message-remove-header "Content-Disposition")
 871     (message-remove-header "Content-Transfer-Encoding")))
 872
 873 (autoload 'message-encode-message-body "message")
 874 (declare-function message-narrow-to-headers-or-head "message" ())
 875
 876 (defun mml-to-mime ()
 877   "Translate the current buffer from MML to MIME."
 878   ;; `message-encode-message-body' will insert an encoded Content-Description
 879   ;; header in the message header if the body contains a single part
 880   ;; that is specified by a user with a MML tag containing a description
 881   ;; token.  So, we encode the message header first to prevent the encoded
 882   ;; Content-Description header from being encoded again.
 883   (save-restriction
 884     (message-narrow-to-headers-or-head)
 885     ;; Skip past any From_ headers.
 886     (while (looking-at "From ")
 887       (forward-line 1))
 888     (let ((mail-parse-charset message-default-charset))
 889       (mail-encode-encoded-word-buffer)))
 890   (message-encode-message-body))
 891
 892 (defun mml-insert-mime (handle &optional no-markup)
 893   (let (textp buffer mmlp)
 894     ;; Determine type and stuff.
 895     (unless (stringp (car handle))
 896       (unless (setq textp (equal (mm-handle-media-supertype handle) "text"))
 897         (save-excursion
 898           (set-buffer (setq buffer (mml-generate-new-buffer " *mml*")))
 899           (mm-insert-part handle 'no-cache)
 900           (if (setq mmlp (equal (mm-handle-media-type handle)
 901                                 "message/rfc822"))
 902               (mime-to-mml)))))
 903     (if mmlp
 904         (mml-insert-mml-markup handle nil t t)
 905       (unless (and no-markup
 906                    (equal (mm-handle-media-type handle) "text/plain"))
 907         (mml-insert-mml-markup handle buffer textp)))
 908     (cond
 909      (mmlp
 910       (insert-buffer-substring buffer)
 911       (goto-char (point-max))
 912       (insert "<#/mml>\n"))
 913      ((stringp (car handle))
 914       (mapc 'mml-insert-mime (cdr handle))
 915       (insert "<#/multipart>\n"))
 916      (textp
 917       (let ((charset (mail-content-type-get
 918                       (mm-handle-type handle) 'charset))
 919             (start (point)))
 920         (if (eq charset 'gnus-decoded)
 921             (mm-insert-part handle)
 922           (insert (mm-decode-string (mm-get-part handle) charset)))
 923         (mml-quote-region start (point)))
 924       (goto-char (point-max)))
 925      (t
 926       (insert "<#/part>\n")))))
 927
 928 (defun mml-insert-mml-markup (handle &optional buffer nofile mmlp)
 929   "Take a MIME handle and insert an MML tag."
 930   (if (stringp (car handle))
 931       (progn
 932         (insert "<#multipart type=" (mm-handle-media-subtype handle))
 933         (let ((start (mm-handle-multipart-ctl-parameter handle 'start)))
 934           (when start
 935             (insert " start=\"" start "\"")))
 936         (insert ">\n"))
 937     (if mmlp
 938         (insert "<#mml type=" (mm-handle-media-type handle))
 939       (insert "<#part type=" (mm-handle-media-type handle)))
 940     (dolist (elem (append (cdr (mm-handle-type handle))
 941                           (cdr (mm-handle-disposition handle))))
 942       (unless (symbolp (cdr elem))
 943         (insert " " (symbol-name (car elem)) "=\"" (cdr elem) "\"")))
 944     (when (mm-handle-id handle)
 945       (insert " id=\"" (mm-handle-id handle) "\""))
 946     (when (mm-handle-disposition handle)
 947       (insert " disposition=" (car (mm-handle-disposition handle))))
 948     (when buffer
 949       (insert " buffer=\"" (buffer-name buffer) "\""))
 950     (when nofile
 951       (insert " nofile=yes"))
 952     (when (mm-handle-description handle)
 953       (insert " description=\"" (mm-handle-description handle) "\""))
 954     (insert ">\n")))
 955
 956 (defun mml-insert-parameter (&rest parameters)
 957   "Insert PARAMETERS in a nice way."
 958   (let (start end)
 959     (dolist (param parameters)
 960       (insert ";")
 961       (setq start (point))
 962       (insert " " param)
 963       (setq end (point))
 964       (goto-char start)
 965       (end-of-line)
 966       (if (> (current-column) 76)
 967           (progn
 968             (goto-char start)
 969             (insert "\n")
 970             (goto-char (1+ end)))
 971         (goto-char end)))))
 972
 973 ;;;
 974 ;;; Mode for inserting and editing MML forms
 975 ;;;
 976
 977 (defvar mml-mode-map
 978   (let ((sign (make-sparse-keymap))
 979         (encrypt (make-sparse-keymap))
 980         (signpart (make-sparse-keymap))
 981         (encryptpart (make-sparse-keymap))
 982         (map (make-sparse-keymap))
 983         (main (make-sparse-keymap)))
 984     (define-key map "\C-s" 'mml-secure-message-sign)
 985     (define-key map "\C-c" 'mml-secure-message-encrypt)
 986     (define-key map "\C-e" 'mml-secure-message-sign-encrypt)
 987     (define-key map "\C-p\C-s" 'mml-secure-sign)
 988     (define-key map "\C-p\C-c" 'mml-secure-encrypt)
 989     (define-key sign "p" 'mml-secure-message-sign-pgpmime)
 990     (define-key sign "o" 'mml-secure-message-sign-pgp)
 991     (define-key sign "s" 'mml-secure-message-sign-smime)
 992     (define-key signpart "p" 'mml-secure-sign-pgpmime)
 993     (define-key signpart "o" 'mml-secure-sign-pgp)
 994     (define-key signpart "s" 'mml-secure-sign-smime)
 995     (define-key encrypt "p" 'mml-secure-message-encrypt-pgpmime)
 996     (define-key encrypt "o" 'mml-secure-message-encrypt-pgp)
 997     (define-key encrypt "s" 'mml-secure-message-encrypt-smime)
 998     (define-key encryptpart "p" 'mml-secure-encrypt-pgpmime)
 999     (define-key encryptpart "o" 'mml-secure-encrypt-pgp)
1000     (define-key encryptpart "s" 'mml-secure-encrypt-smime)
1001     (define-key map "\C-n" 'mml-unsecure-message)
1002     (define-key map "f" 'mml-attach-file)
1003     (define-key map "b" 'mml-attach-buffer)
1004     (define-key map "e" 'mml-attach-external)
1005     (define-key map "q" 'mml-quote-region)
1006     (define-key map "m" 'mml-insert-multipart)
1007     (define-key map "p" 'mml-insert-part)
1008     (define-key map "v" 'mml-validate)
1009     (define-key map "P" 'mml-preview)
1010     (define-key map "s" sign)
1011     (define-key map "S" signpart)
1012     (define-key map "c" encrypt)
1013     (define-key map "C" encryptpart)
1014     ;;(define-key map "n" 'mml-narrow-to-part)
1015     ;; `M-m' conflicts with `back-to-indentation'.
1016     ;; (define-key main "\M-m" map)
1017     (define-key main "\C-c\C-m" map)
1018     main))
1019
1020 (easy-menu-define
1021   mml-menu mml-mode-map ""
1022   `("Attachments"
1023     ["Attach File..." mml-attach-file
1024      ,@(if (featurep 'xemacs) '(t)
1025          '(:help "Attach a file at point"))]
1026     ["Attach Buffer..." mml-attach-buffer
1027      ,@(if (featurep 'xemacs) '(t)
1028          '(:help "Attach a buffer to the outgoing MIME message"))]
1029     ["Attach External..." mml-attach-external
1030      ,@(if (featurep 'xemacs) '(t)
1031          '(:help "Attach reference to file"))]
1032     ;;
1033     ("Change Security Method"
1034      ["PGP/MIME"
1035       (lambda () (interactive) (setq mml-secure-method "pgpmime"))
1036       ,@(if (featurep 'xemacs) nil
1037           '(:help "Set Security Method to PGP/MIME"))
1038       :style radio
1039       :selected (equal mml-secure-method "pgpmime") ]
1040      ["S/MIME"
1041       (lambda () (interactive) (setq mml-secure-method "smime"))
1042       ,@(if (featurep 'xemacs) nil
1043           '(:help "Set Security Method to S/MIME"))
1044       :style radio
1045       :selected (equal mml-secure-method "smime") ]
1046      ["Inline PGP"
1047       (lambda () (interactive) (setq mml-secure-method "pgp"))
1048       ,@(if (featurep 'xemacs) nil
1049           '(:help "Set Security Method to inline PGP"))
1050       :style radio
1051       :selected (equal mml-secure-method "pgp") ] )
1052     ;;
1053     ["Sign Message" mml-secure-message-sign t]
1054     ["Encrypt Message" mml-secure-message-encrypt t]
1055     ["Sign and Encrypt Message" mml-secure-message-sign-encrypt t]
1056     ["Encrypt/Sign off" mml-unsecure-message
1057      ,@(if (featurep 'xemacs) '(t)
1058          '(:help "Don't Encrypt/Sign Message"))]
1059     ;; Maybe we could remove these, because people who write MML most probably
1060     ;; don't use the menu:
1061     ["Insert Part..." mml-insert-part
1062      :active (message-in-body-p)]
1063     ["Insert Multipart..." mml-insert-multipart
1064      :active (message-in-body-p)]
1065     ;;
1066     ;; Do we have separate encrypt and encrypt/sign commands for parts?
1067     ["Sign Part" mml-secure-sign t]
1068     ["Encrypt Part" mml-secure-encrypt t]
1069     ;;["Narrow" mml-narrow-to-part t]
1070     ["Quote MML in region" mml-quote-region
1071      :active (message-mark-active-p)
1072      ,@(if (featurep 'xemacs) nil
1073          '(:help "Quote MML tags in region"))]
1074     ["Validate MML" mml-validate t]
1075     ["Preview" mml-preview t]
1076     "----"
1077     ["Emacs MIME manual" (lambda () (interactive) (message-info 4))
1078      ,@(if (featurep 'xemacs) '(t)
1079          '(:help "Display the Emacs MIME manual"))]
1080     ["PGG manual" (lambda () (interactive) (message-info 16))
1081      ,@(if (featurep 'xemacs) '(t)
1082          '(:help "Display the PGG manual"))]))
1083
1084 (defvar mml-mode nil
1085   "Minor mode for editing MML.")
1086
1087 (defun mml-mode (&optional arg)
1088   "Minor mode for editing MML.
1089 MML is the MIME Meta Language, a minor mode for composing MIME articles.
1090 See Info node `(emacs-mime)Composing'.
1091
1092 \\{mml-mode-map}"
1093   (interactive "P")
1094   (when (set (make-local-variable 'mml-mode)
1095              (if (null arg) (not mml-mode)
1096                (> (prefix-numeric-value arg) 0)))
1097     (add-minor-mode 'mml-mode " MML" mml-mode-map)
1098     (easy-menu-add mml-menu mml-mode-map)
1099     (when (boundp 'dnd-protocol-alist)
1100       (set (make-local-variable 'dnd-protocol-alist)
1101            (append mml-dnd-protocol-alist dnd-protocol-alist)))
1102     (run-hooks 'mml-mode-hook)))
1103
1104 ;;;
1105 ;;; Helper functions for reading MIME stuff from the minibuffer and
1106 ;;; inserting stuff to the buffer.
1107 ;;;
1108
1109 (defcustom mml-default-directory mm-default-directory
1110   "The default directory where mml will find files.
1111 If not set, `default-directory' will be used."
1112   :type '(choice directory (const :tag "Default" nil))
1113   :version "23.0" ;; No Gnus
1114   :group 'message)
1115
1116 (defun mml-minibuffer-read-file (prompt)
1117   (let* ((completion-ignored-extensions nil)
1118          (file (read-file-name prompt
1119                                (or mml-default-directory default-directory)
1120                                nil t)))
1121     ;; Prevent some common errors.  This is inspired by similar code in
1122     ;; VM.
1123     (when (file-directory-p file)
1124       (error "%s is a directory, cannot attach" file))
1125     (unless (file-exists-p file)
1126       (error "No such file: %s" file))
1127     (unless (file-readable-p file)
1128       (error "Permission denied: %s" file))
1129     file))
1130
1131 (defun mml-minibuffer-read-type (name &optional default)
1132   (mailcap-parse-mimetypes)
1133   (let* ((default (or default
1134                       (mm-default-file-encoding name)
1135                       ;; Perhaps here we should check what the file
1136                       ;; looks like, and offer text/plain if it looks
1137                       ;; like text/plain.
1138                       "application/octet-stream"))
1139          (string (completing-read
1140                   (format "Content type (default %s): " default)
1141                   (mapcar 'list (mailcap-mime-types)))))
1142     (if (not (equal string ""))
1143         string
1144       default)))
1145
1146 (defun mml-minibuffer-read-description ()
1147   (let ((description (read-string "One line description: ")))
1148     (when (string-match "\\`[ \t]*\\'" description)
1149       (setq description nil))
1150     description))
1151
1152 (defun mml-minibuffer-read-disposition (type &optional default filename)
1153   (unless default
1154     (setq default (mml-content-disposition type filename)))
1155   (let ((disposition (completing-read
1156                       (format "Disposition (default %s): " default)
1157                       '(("attachment") ("inline") (""))
1158                       nil t nil nil default)))
1159     (if (not (equal disposition ""))
1160         disposition
1161       default)))
1162
1163 (defun mml-quote-region (beg end)
1164   "Quote the MML tags in the region."
1165   (interactive "r")
1166   (save-excursion
1167     (save-restriction
1168       ;; Temporarily narrow the region to defend from changes
1169       ;; invalidating END.
1170       (narrow-to-region beg end)
1171       (goto-char (point-min))
1172       ;; Quote parts.
1173       (while (re-search-forward
1174               "<#!*/?\\(multipart\\|part\\|external\\|mml\\)" nil t)
1175         ;; Insert ! after the #.
1176         (goto-char (+ (match-beginning 0) 2))
1177         (insert "!")))))
1178
1179 (defun mml-insert-tag (name &rest plist)
1180   "Insert an MML tag described by NAME and PLIST."
1181   (when (symbolp name)
1182     (setq name (symbol-name name)))
1183   (insert "<#" name)
1184   (while plist
1185     (let ((key (pop plist))
1186           (value (pop plist)))
1187       (when value
1188         ;; Quote VALUE if it contains suspicious characters.
1189         (when (string-match "[\"'\\~/*;() \t\n]" value)
1190           (setq value (with-output-to-string
1191                         (let (print-escape-nonascii)
1192                           (prin1 value)))))
1193         (insert (format " %s=%s" key value)))))
1194   (insert ">\n"))
1195
1196 (defun mml-insert-empty-tag (name &rest plist)
1197   "Insert an empty MML tag described by NAME and PLIST."
1198   (when (symbolp name)
1199     (setq name (symbol-name name)))
1200   (apply #'mml-insert-tag name plist)
1201   (insert "<#/" name ">\n"))
1202
1203 ;;; Attachment functions.
1204
1205 (defcustom mml-dnd-protocol-alist
1206   '(("^file:///" . mml-dnd-attach-file)
1207     ("^file://"  . dnd-open-file)
1208     ("^file:"    . mml-dnd-attach-file))
1209   "The functions to call when a drop in `mml-mode' is made.
1210 See `dnd-protocol-alist' for more information.  When nil, behave
1211 as in other buffers."
1212   :type '(choice (repeat (cons (regexp) (function)))
1213                  (const :tag "Behave as in other buffers" nil))
1214   :version "22.1" ;; Gnus 5.10.9
1215   :group 'message)
1216
1217 (defcustom mml-dnd-attach-options nil
1218   "Which options should be queried when attaching a file via drag and drop.
1219
1220 If it is a list, valid members are `type', `description' and
1221 `disposition'.  `disposition' implies `type'.  If it is nil,
1222 don't ask for options.  If it is t, ask the user whether or not
1223 to specify options."
1224   :type '(choice
1225           (const :tag "Non" nil)
1226           (const :tag "Query" t)
1227           (list :value (type description disposition)
1228            (set :inline t
1229                 (const type)
1230                 (const description)
1231                 (const disposition))))
1232   :version "22.1" ;; Gnus 5.10.9
1233   :group 'message)
1234
1235 (defun mml-attach-file (file &optional type description disposition)
1236   "Attach a file to the outgoing MIME message.
1237 The file is not inserted or encoded until you send the message with
1238 `\\[message-send-and-exit]' or `\\[message-send]'.
1239
1240 FILE is the name of the file to attach.  TYPE is its
1241 content-type, a string of the form \"type/subtype\".  DESCRIPTION
1242 is a one-line description of the attachment.  The DISPOSITION
1243 specifies how the attachment is intended to be displayed.  It can
1244 be either \"inline\" (displayed automatically within the message
1245 body) or \"attachment\" (separate from the body)."
1246   (interactive
1247    (let* ((file (mml-minibuffer-read-file "Attach file: "))
1248           (type (mml-minibuffer-read-type file))
1249           (description (mml-minibuffer-read-description))
1250           (disposition (mml-minibuffer-read-disposition type nil file)))
1251      (list file type description disposition)))
1252   (save-excursion
1253     (unless (message-in-body-p) (goto-char (point-max)))
1254     (mml-insert-empty-tag 'part
1255                           'type type
1256                           'filename file
1257                           'disposition (or disposition "attachment")
1258                           'description description)))
1259
1260 (defun mml-dnd-attach-file (uri action)
1261   "Attach a drag and drop file.
1262
1263 Ask for type, description or disposition according to
1264 `mml-dnd-attach-options'."
1265   (let ((file (dnd-get-local-file-name uri t)))
1266     (when (and file (file-regular-p file))
1267       (let ((mml-dnd-attach-options mml-dnd-attach-options)
1268             type description disposition)
1269         (setq mml-dnd-attach-options
1270               (when (and (eq mml-dnd-attach-options t)
1271                          (not
1272                           (y-or-n-p
1273                            "Use default type, disposition and description? ")))
1274                 '(type description disposition)))
1275         (when (or (memq 'type mml-dnd-attach-options)
1276                   (memq 'disposition mml-dnd-attach-options))
1277           (setq type (mml-minibuffer-read-type file)))
1278         (when (memq 'description mml-dnd-attach-options)
1279           (setq description (mml-minibuffer-read-description)))
1280         (when (memq 'disposition mml-dnd-attach-options)
1281           (setq disposition (mml-minibuffer-read-disposition type nil file)))
1282         (mml-attach-file file type description disposition)))))
1283
1284 (defun mml-attach-buffer (buffer &optional type description)
1285   "Attach a buffer to the outgoing MIME message.
1286 See `mml-attach-file' for details of operation."
1287   (interactive
1288    (let* ((buffer (read-buffer "Attach buffer: "))
1289           (type (mml-minibuffer-read-type buffer "text/plain"))
1290           (description (mml-minibuffer-read-description)))
1291      (list buffer type description)))
1292   (save-excursion
1293     (unless (message-in-body-p) (goto-char (point-max)))
1294     (mml-insert-empty-tag 'part 'type type 'buffer buffer
1295                           'disposition "attachment"
1296                           'description description)))
1297
1298 (defun mml-attach-external (file &optional type description)
1299   "Attach an external file into the buffer.
1300 FILE is an ange-ftp/efs specification of the part location.
1301 TYPE is the MIME type to use."
1302   (interactive
1303    (let* ((file (mml-minibuffer-read-file "Attach external file: "))
1304           (type (mml-minibuffer-read-type file))
1305           (description (mml-minibuffer-read-description)))
1306      (list file type description)))
1307   (save-excursion
1308     (unless (message-in-body-p) (goto-char (point-max)))
1309     (mml-insert-empty-tag 'external 'type type 'name file
1310                           'disposition "attachment" 'description description)))
1311
1312 (defun mml-insert-multipart (&optional type)
1313   (interactive (list (completing-read "Multipart type (default mixed): "
1314                                       '(("mixed") ("alternative") ("digest") ("parallel")
1315                                         ("signed") ("encrypted"))
1316                                       nil nil "mixed")))
1317   (or type
1318       (setq type "mixed"))
1319   (mml-insert-empty-tag "multipart" 'type type)
1320   (forward-line -1))
1321
1322 (defun mml-insert-part (&optional type)
1323   (interactive
1324    (list (mml-minibuffer-read-type "")))
1325   (mml-insert-tag 'part 'type type 'disposition "inline")
1326   (forward-line -1))
1327
1328 (declare-function message-subscribed-p "message" ())
1329 (declare-function message-make-mail-followup-to "message"
1330                   (&optional only-show-subscribed))
1331 (declare-function message-position-on-field "message" (header &rest afters))
1332
1333 (defun mml-preview-insert-mail-followup-to ()
1334   "Insert a Mail-Followup-To header before previewing an article.
1335 Should be adopted if code in `message-send-mail' is changed."
1336   (when (and (message-mail-p)
1337              (message-subscribed-p)
1338              (not (mail-fetch-field "mail-followup-to"))
1339              (message-make-mail-followup-to))
1340     (message-position-on-field "Mail-Followup-To" "X-Draft-From")
1341     (insert (message-make-mail-followup-to))))
1342
1343 (defvar mml-preview-buffer nil)
1344
1345 (autoload 'gnus-make-hashtable "gnus-util")
1346 (autoload 'widget-button-press "wid-edit" nil t)
1347 (declare-function widget-event-point "wid-edit" (event))
1348 ;; If gnus-buffer-configuration is bound this is loaded.
1349 (declare-function gnus-configure-windows "gnus-win" (setting &optional force))
1350 ;; Called after message-mail-p, which autoloads message.
1351 (declare-function message-news-p                "message" ())
1352 (declare-function message-options-set-recipient "message" ())
1353 (declare-function message-generate-headers      "message" (headers))
1354 (declare-function message-sort-headers          "message" ())
1355
1356 (defun mml-preview (&optional raw)
1357   "Display current buffer with Gnus, in a new buffer.
1358 If RAW, display a raw encoded MIME message.
1359
1360 The window layout for the preview buffer is controled by the variables
1361 `special-display-buffer-names', `special-display-regexps', or
1362 `gnus-buffer-configuration' (the first match made will be used),
1363 or the `pop-to-buffer' function."
1364   (interactive "P")
1365   (setq mml-preview-buffer (generate-new-buffer
1366                             (concat (if raw "*Raw MIME preview of "
1367                                       "*MIME preview of ") (buffer-name))))
1368   (save-excursion
1369     (let* ((buf (current-buffer))
1370            (message-options message-options)
1371            (message-this-is-mail (message-mail-p))
1372            (message-this-is-news (message-news-p))
1373            (message-posting-charset (or (gnus-setup-posting-charset
1374                                          (save-restriction
1375                                            (message-narrow-to-headers-or-head)
1376                                            (message-fetch-field "Newsgroups")))
1377                                         message-posting-charset)))
1378       (message-options-set-recipient)
1379       (when (boundp 'gnus-buffers)
1380         (push mml-preview-buffer gnus-buffers))
1381       (save-restriction
1382         (widen)
1383         (set-buffer mml-preview-buffer)
1384         (erase-buffer)
1385         (insert-buffer-substring buf))
1386       (mml-preview-insert-mail-followup-to)
1387       (let ((message-deletable-headers (if (message-news-p)
1388                                            nil
1389                                          message-deletable-headers)))
1390         (message-generate-headers
1391          (copy-sequence (if (message-news-p)
1392                             message-required-news-headers
1393                           message-required-mail-headers))))
1394       (if (re-search-forward
1395            (concat "^" (regexp-quote mail-header-separator) "\n") nil t)
1396           (replace-match "\n"))
1397       (let ((mail-header-separator ""));; mail-header-separator is removed.
1398         (message-sort-headers)
1399         (mml-to-mime))
1400       (if raw
1401           (when (fboundp 'set-buffer-multibyte)
1402             (let ((s (buffer-string)))
1403               ;; Insert the content into unibyte buffer.
1404               (erase-buffer)
1405               (mm-disable-multibyte)
1406               (insert s)))
1407         (let ((gnus-newsgroup-charset (car message-posting-charset))
1408               gnus-article-prepare-hook gnus-original-article-buffer)
1409           (run-hooks 'gnus-article-decode-hook)
1410           (let ((gnus-newsgroup-name "dummy")
1411                 (gnus-newsrc-hashtb (or gnus-newsrc-hashtb
1412                                         (gnus-make-hashtable 5))))
1413             (gnus-article-prepare-display))))
1414       ;; Disable article-mode-map.
1415       (use-local-map nil)
1416       (gnus-make-local-hook 'kill-buffer-hook)
1417       (add-hook 'kill-buffer-hook
1418                 (lambda ()
1419                   (mm-destroy-parts gnus-article-mime-handles)) nil t)
1420       (setq buffer-read-only t)
1421       (local-set-key "q" (lambda () (interactive) (kill-buffer nil)))
1422       (local-set-key "=" (lambda () (interactive) (delete-other-windows)))
1423       (local-set-key "\r"
1424                      (lambda ()
1425                        (interactive)
1426                        (widget-button-press (point))))
1427       (local-set-key gnus-mouse-2
1428                      (lambda (event)
1429                        (interactive "@e")
1430                        (widget-button-press (widget-event-point event) event)))
1431       ;; FIXME: Buffer is in article mode, but most tool bar commands won't
1432       ;; work.  Maybe only keep the following icons: search, print, quit
1433       (goto-char (point-min))))
1434   (if (and (not (mm-special-display-p (buffer-name mml-preview-buffer)))
1435            (boundp 'gnus-buffer-configuration)
1436            (assq 'mml-preview gnus-buffer-configuration))
1437       (let ((gnus-message-buffer (current-buffer)))
1438         (gnus-configure-windows 'mml-preview))
1439     (pop-to-buffer mml-preview-buffer)))
1440
1441 (defun mml-validate ()
1442   "Validate the current MML document."
1443   (interactive)
1444   (mml-parse))
1445
1446 (defun mml-tweak-part (cont)
1447   "Tweak a MML part."
1448   (let ((tweak (cdr (assq 'tweak cont)))
1449         func)
1450     (cond
1451      (tweak
1452       (setq func
1453             (or (cdr (assoc tweak mml-tweak-function-alist))
1454                 (intern tweak))))
1455      (mml-tweak-type-alist
1456       (let ((alist mml-tweak-type-alist)
1457             (type (or (cdr (assq 'type cont)) "text/plain")))
1458         (while alist
1459           (if (string-match (caar alist) type)
1460               (setq func (cdar alist)
1461                     alist nil)
1462             (setq alist (cdr alist)))))))
1463     (if func
1464         (funcall func cont)
1465       cont)
1466     (let ((alist mml-tweak-sexp-alist))
1467       (while alist
1468         (if (eval (caar alist))
1469             (funcall (cdar alist) cont))
1470         (setq alist (cdr alist)))))
1471   cont)
1472
1473 (defun mml-tweak-externalize-attachments (cont)
1474   "Tweak attached files as external parts."
1475   (let (filename-cons)
1476     (when (and (eq (car cont) 'part)
1477                (not (cdr (assq 'buffer cont)))
1478                (and (setq filename-cons (assq 'filename cont))
1479                     (not (equal (cdr (assq 'nofile cont)) "yes"))))
1480       (setcar cont 'external)
1481       (setcar filename-cons 'name))))
1482
1483 (provide 'mml)
1484
1485 ;;; arch-tag: 583c96cf-1ffe-451b-a5e5-4733ae9ddd12
1486 ;;; mml.el ends here