lisp/mh-e/mh-mime.el

   1 ;;; mh-mime.el --- MH-E MIME support
   2
   3 ;; Copyright (C) 1993, 1995, 2001-2017 Free Software Foundation, Inc.
   4
   5 ;; Author: Bill Wohler <wohler@newt.com>
   6 ;; Maintainer: Bill Wohler <wohler@newt.com>
   7 ;; Keywords: mail
   8 ;; See: mh-e.el
   9
  10 ;; This file is part of GNU Emacs.
  11
  12 ;; GNU Emacs is free software: you can redistribute it and/or modify
  13 ;; it under the terms of the GNU General Public License as published by
  14 ;; the Free Software Foundation, either version 3 of the License, or
  15 ;; (at your option) any later version.
  16
  17 ;; GNU Emacs is distributed in the hope that it will be useful,
  18 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  19 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20 ;; GNU General Public License for more details.
  21
  22 ;; You should have received a copy of the GNU General Public License
  23 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  24
  25 ;;; Commentary:
  26
  27 ;; Message composition of MIME message is done with either MH-style
  28 ;; directives for mhn or mhbuild (MH 6.8 or later) or MML (MIME Meta
  29 ;; Language) tags.
  30
  31 ;; TODO:
  32 ;;   Paragraph code should not fill # lines if MIME enabled.
  33 ;;   Implement mh-auto-mh-to-mime (if non-nil, \\[mh-send-letter]
  34 ;;      invokes mh-mh-to-mime automatically before sending.)
  35 ;;      Actually, instead of mh-auto-mh-to-mime,
  36 ;;      should read automhnproc from profile.
  37 ;;   MIME option to mh-forward command to move to content-description
  38 ;;   insertion point.
  39
  40 ;;; Change Log:
  41
  42 ;;; Code:
  43
  44 (require 'mh-e)
  45 (require 'mh-gnus)                      ;needed because mh-gnus.el not compiled
  46
  47 (require 'font-lock)
  48 (require 'gnus-util)
  49 (require 'mailcap)
  50 (require 'mm-decode)
  51 (require 'mm-view)
  52 (require 'mml)
  53
  54 (autoload 'article-emphasize "gnus-art")
  55 (autoload 'gnus-eval-format "gnus-spec")
  56 (autoload 'mail-content-type-get "mail-parse")
  57 (autoload 'mail-decode-encoded-word-string "mail-parse")
  58 (autoload 'mail-header-parse-content-type "mail-parse")
  59 (autoload 'mail-header-strip-cte "mail-parse")
  60 (autoload 'mail-strip-quoted-names "mail-utils")
  61 (autoload 'message-options-get "message")
  62 (autoload 'message-options-set "message")
  63 (autoload 'message-options-set-recipient "message")
  64 (autoload 'mm-decode-body "mm-bodies")
  65 (autoload 'mm-uu-dissect "mm-uu")
  66 (autoload 'mml-unsecure-message "mml-sec")
  67 (autoload 'rfc2047-decode-region "rfc2047")
  68 (autoload 'widget-convert-button "wid-edit")
  69
  70 \f
  71
  72 ;;; Variables
  73
  74 ;; This has to be a macro, since we do: (setf (mh-buffer-data) ...)
  75 ;;;###mh-autoload
  76 (defmacro mh-buffer-data ()
  77   "Convenience macro to get the MIME data structures of the current buffer."
  78   `(gethash (current-buffer) mh-globals-hash))
  79
  80 ;; Structure to keep track of MIME handles on a per buffer basis.
  81 (mh-defstruct (mh-buffer-data (:conc-name mh-mime-)
  82                               (:constructor mh-make-buffer-data))
  83   (handles ())                          ; List of MIME handles
  84   (handles-cache (make-hash-table))     ; Cache to avoid multiple decodes of
  85                                         ; nested messages
  86   (parts-count 0)                       ; The button number is generated from
  87                                         ; this number
  88   (part-index-hash (make-hash-table)))  ; Avoid incrementing the part number
  89                                         ; for nested messages
  90
  91 (defvar mh-mm-inline-media-tests
  92   `(("image/jpeg"
  93      mm-inline-image
  94      (lambda (handle)
  95        (mm-valid-and-fit-image-p 'jpeg handle)))
  96     ("image/png"
  97      mm-inline-image
  98      (lambda (handle)
  99        (mm-valid-and-fit-image-p 'png handle)))
 100     ("image/gif"
 101      mm-inline-image
 102      (lambda (handle)
 103        (mm-valid-and-fit-image-p 'gif handle)))
 104     ("image/tiff"
 105      mm-inline-image
 106      (lambda (handle)
 107        (mm-valid-and-fit-image-p 'tiff handle)) )
 108     ("image/xbm"
 109      mm-inline-image
 110      (lambda (handle)
 111        (mm-valid-and-fit-image-p 'xbm handle)))
 112     ("image/x-xbitmap"
 113      mm-inline-image
 114      (lambda (handle)
 115        (mm-valid-and-fit-image-p 'xbm handle)))
 116     ("image/xpm"
 117      mm-inline-image
 118      (lambda (handle)
 119        (mm-valid-and-fit-image-p 'xpm handle)))
 120     ("image/x-pixmap"
 121      mm-inline-image
 122      (lambda (handle)
 123        (mm-valid-and-fit-image-p 'xpm handle)))
 124     ("image/bmp"
 125      mm-inline-image
 126      (lambda (handle)
 127        (mm-valid-and-fit-image-p 'bmp handle)))
 128     ("image/x-portable-bitmap"
 129      mm-inline-image
 130      (lambda (handle)
 131        (mm-valid-and-fit-image-p 'pbm handle)))
 132     ("text/plain" mm-inline-text identity)
 133     ("text/enriched" mm-inline-text identity)
 134     ("text/richtext" mm-inline-text identity)
 135     ("text/x-patch" mm-display-patch-inline
 136      (lambda (handle)
 137        (locate-library "diff-mode")))
 138     ("application/emacs-lisp" mm-display-elisp-inline identity)
 139     ("application/x-emacs-lisp" mm-display-elisp-inline identity)
 140     ("text/html"
 141      ,(if (fboundp 'mm-inline-text-html) 'mm-inline-text-html 'mm-inline-text)
 142      (lambda (handle)
 143        (or (and (boundp 'mm-inline-text-html-renderer)
 144                 mm-inline-text-html-renderer)
 145            (and (boundp 'mm-text-html-renderer) mm-text-html-renderer))))
 146     ("text/x-vcard"
 147      mh-mm-inline-text-vcard
 148      (lambda (handle)
 149        (or (featurep 'vcard)
 150            (locate-library "vcard"))))
 151     ("message/delivery-status" mm-inline-text identity)
 152     ("message/rfc822" mh-mm-inline-message identity)
 153     ;;("message/partial" mm-inline-partial identity)
 154     ;;("message/external-body" mm-inline-external-body identity)
 155     ("text/.*" mm-inline-text identity)
 156     ("audio/wav" mm-inline-audio
 157      (lambda (handle)
 158        (and (or (featurep 'nas-sound) (featurep 'native-sound))
 159             (device-sound-enabled-p))))
 160     ("audio/au"
 161      mm-inline-audio
 162      (lambda (handle)
 163        (and (or (featurep 'nas-sound) (featurep 'native-sound))
 164             (device-sound-enabled-p))))
 165     ("application/pgp-signature" ignore identity)
 166     ("application/x-pkcs7-signature" ignore identity)
 167     ("application/pkcs7-signature" ignore identity)
 168     ("application/x-pkcs7-mime" ignore identity)
 169     ("application/pkcs7-mime" ignore identity)
 170     ("multipart/alternative" ignore identity)
 171     ("multipart/mixed" ignore identity)
 172     ("multipart/related" ignore identity)
 173     ;; Disable audio and image
 174     ("audio/.*" ignore ignore)
 175     ("image/.*" ignore ignore)
 176     ;; Default to displaying as text
 177     (".*" mm-inline-text mh-mm-readable-p))
 178   "Alist of media types/tests saying whether types can be displayed inline.")
 179
 180 (defvar mh-mime-save-parts-directory nil
 181   "Default to use for `mh-mime-save-parts-default-directory'.
 182 Set from last use.")
 183
 184 ;; Copied from gnus-art.el (should be checked for other cool things that can
 185 ;; be added to the buttons)
 186 (defvar mh-mime-button-commands
 187   '((mh-press-button "\r" "Toggle Display")))
 188 (defvar mh-mime-button-map
 189   (let ((map (make-sparse-keymap)))
 190     (unless (>= (string-to-number emacs-version) 21)
 191       ;; XEmacs doesn't care.
 192       (set-keymap-parent map mh-show-mode-map))
 193     (mh-do-in-gnu-emacs
 194      (define-key map [mouse-2] 'mh-push-button))
 195     (mh-do-in-xemacs
 196      (define-key map '(button2) 'mh-push-button))
 197     (dolist (c mh-mime-button-commands)
 198       (define-key map (cadr c) (car c)))
 199     map))
 200 (defvar mh-mime-button-line-format-alist
 201   '((?T long-type ?s)
 202     (?d description ?s)
 203     (?p index ?s)
 204     (?e dots ?s)))
 205 (defvar mh-mime-button-line-format "%{%([%p. %d%T]%)%}%e\n")
 206 (defvar mh-mime-security-button-pressed nil)
 207 (defvar mh-mime-security-button-line-format "%{%([[%t:%i]%D]%)%}\n")
 208 (defvar mh-mime-security-button-end-line-format "%{%([[End of %t]%D]%)%}\n")
 209 (defvar mh-mime-security-button-line-format-alist
 210   '((?t type ?s)
 211     (?i info ?s)
 212     (?d details ?s)
 213     (?D pressed-details ?s)))
 214 (defvar mh-mime-security-button-map
 215   (let ((map (make-sparse-keymap)))
 216     (unless (>= (string-to-number emacs-version) 21)
 217       (set-keymap-parent map mh-show-mode-map))
 218     (define-key map "\r" 'mh-press-button)
 219     (mh-do-in-gnu-emacs
 220      (define-key map [mouse-2] 'mh-push-button))
 221     (mh-do-in-xemacs
 222      (define-key map '(button2) 'mh-push-button))
 223     map))
 224
 225 \f
 226
 227 ;;; MH-Folder Commands
 228
 229 ;; Alphabetical.
 230
 231 ;;;###mh-autoload
 232 (defun mh-display-with-external-viewer (part-index)
 233   "View attachment externally.
 234
 235 If Emacs does not know how to view an attachment, you could save
 236 it into a file and then run some program to open it. It is
 237 easier, however, to launch the program directly from MH-E with
 238 this command. While you'll most likely use this to view
 239 spreadsheets and documents, it is also useful to use your browser
 240 to view HTML attachments with higher fidelity than what Emacs can
 241 provide.
 242
 243 This command displays the attachment associated with the button
 244 under the cursor. If the cursor is not located over a button,
 245 then the cursor first moves to the next button, wrapping to the
 246 beginning of the message if necessary. You can provide a numeric
 247 prefix argument PART-INDEX to view the attachment labeled with
 248 that number.
 249
 250 This command tries to provide a reasonable default for the viewer
 251 by calling the Emacs function `mailcap-mime-info'. This function
 252 usually reads the file \"/etc/mailcap\"."
 253   (interactive "P")
 254   (when (consp part-index) (setq part-index (car part-index)))
 255   (mh-folder-mime-action
 256    part-index
 257    #'(lambda ()
 258        (let* ((part (get-text-property (point) 'mh-data))
 259               (type (mm-handle-media-type part))
 260               (methods (mapcar (lambda (x) (list (cdr (assoc 'viewer x))))
 261                                (mailcap-mime-info type 'all)))
 262               (def (caar methods))
 263               (prompt (format "Viewer%s: " (if def
 264                                                (format " (default %s)" def)
 265                                              "")))
 266               (method (completing-read prompt methods nil nil nil nil def))
 267               (folder mh-show-folder-buffer)
 268               (buffer-read-only nil))
 269          (when (string-match "^[^% \t]+$" method)
 270            (setq method (concat method " %s")))
 271          (mh-flet
 272           ((mm-handle-set-external-undisplayer
 273             (handle function)
 274             (mh-handle-set-external-undisplayer folder handle function)))
 275           (unwind-protect (mm-display-external part method)
 276             (set-buffer-modified-p nil)))))
 277    nil))
 278
 279 ;;;###mh-autoload
 280 (defun mh-folder-inline-mime-part (part-index)
 281   "Show attachment verbatim.
 282
 283 You can view the raw contents of an attachment with this command.
 284 This command displays (or hides) the contents of the attachment
 285 associated with the button under the cursor verbatim. If the
 286 cursor is not located over a button, then the cursor first moves
 287 to the next button, wrapping to the beginning of the message if
 288 necessary.
 289
 290 You can also provide a numeric prefix argument PART-INDEX to view
 291 the attachment labeled with that number."
 292   (interactive "P")
 293   (when (consp part-index) (setq part-index (car part-index)))
 294   (mh-folder-mime-action part-index #'mh-mime-inline-part nil))
 295
 296 (defun mh-mime-inline-part ()
 297   "Toggle display of the raw MIME part."
 298   (interactive)
 299   (let* ((buffer-read-only nil)
 300          (data (get-text-property (point) 'mh-data))
 301          (inserted-flag (get-text-property (point) 'mh-mime-inserted))
 302          (displayed-flag (mm-handle-displayed-p data))
 303          (point (point))
 304          start end)
 305     (cond ((and data (not inserted-flag) (not displayed-flag))
 306            (let ((contents (mm-get-part data)))
 307              (add-text-properties (mh-line-beginning-position)
 308                                   (mh-line-end-position) '(mh-mime-inserted t))
 309              (setq start (point-marker))
 310              (forward-line 1)
 311              (mm-insert-inline data contents)
 312              (setq end (point-marker))
 313              (add-text-properties
 314               start (progn (goto-char start) (mh-line-end-position))
 315               `(mh-region (,start . ,end)))))
 316           ((and data (or inserted-flag displayed-flag))
 317            (mh-press-button)
 318            (message "MIME part already inserted")))
 319     (goto-char point)
 320     (set-buffer-modified-p nil)))
 321
 322 ;;;###mh-autoload
 323 (defun mh-folder-save-mime-part (part-index)
 324   "Save (output) attachment.
 325
 326 This command saves the attachment associated with the button under the
 327 cursor. If the cursor is not located over a button, then the cursor
 328 first moves to the next button, wrapping to the beginning of the
 329 message if necessary.
 330
 331 You can also provide a numeric prefix argument PART-INDEX to save the
 332 attachment labeled with that number.
 333
 334 This command prompts you for a filename and suggests a specific name
 335 if it is available."
 336   (interactive "P")
 337   (when (consp part-index) (setq part-index (car part-index)))
 338   (mh-folder-mime-action part-index #'mh-mime-save-part nil))
 339
 340 (defun mh-mime-save-part ()
 341   "Save MIME part at point."
 342   (interactive)
 343   (let ((data (get-text-property (point) 'mh-data)))
 344     (when data
 345       (let ((mm-default-directory
 346              (file-name-as-directory (or mh-mime-save-parts-directory
 347                                          default-directory))))
 348         (mh-mm-save-part data)
 349         (setq mh-mime-save-parts-directory mm-default-directory)))))
 350
 351 ;;;###mh-autoload
 352 (defun mh-folder-toggle-mime-part (part-index)
 353   "View attachment.
 354
 355 This command displays (or hides) the attachment associated with
 356 the button under the cursor. If the cursor is not located over a
 357 button, then the cursor first moves to the next button, wrapping
 358 to the beginning of the message if necessary. This command has
 359 the advantage over related commands of working from the MH-Folder
 360 buffer.
 361
 362 You can also provide a numeric prefix argument PART-INDEX to view
 363 the attachment labeled with that number. If Emacs does not know
 364 how to display the attachment, then Emacs offers to save the
 365 attachment in a file."
 366   (interactive "P")
 367   (when (consp part-index) (setq part-index (car part-index)))
 368   (mh-folder-mime-action part-index #'mh-press-button t))
 369
 370 ;;;###mh-autoload
 371 (defun mh-mime-save-parts (prompt)
 372   "Save attachments.
 373
 374 You can save all of the attachments at once with this command.
 375 The attachments are saved in the directory specified by the
 376 option `mh-mime-save-parts-default-directory' unless you use a
 377 prefix argument PROMPT in which case you are prompted for the
 378 directory. These directories may be superseded by MH profile
 379 components, since this function calls on \"mhstore\" (\"mhn\") to
 380 do the work."
 381   (interactive "P")
 382   (let ((msg (if (eq major-mode 'mh-show-mode)
 383                  (mh-show-buffer-message-number)
 384                (mh-get-msg-num t)))
 385         (folder (if (eq major-mode 'mh-show-mode)
 386                     mh-show-folder-buffer
 387                   mh-current-folder))
 388         (command (if (mh-variant-p 'nmh) "mhstore" "mhn"))
 389         (directory
 390          (cond
 391           ((and (or prompt
 392                     (equal nil mh-mime-save-parts-default-directory)
 393                     (equal t mh-mime-save-parts-default-directory))
 394                 (not mh-mime-save-parts-directory))
 395            (read-directory-name "Store in directory: " nil nil t))
 396           ((and (or prompt
 397                     (equal t mh-mime-save-parts-default-directory))
 398                 mh-mime-save-parts-directory)
 399            (read-directory-name (format
 400                             "Store in directory (default %s): "
 401                             mh-mime-save-parts-directory)
 402                            "" mh-mime-save-parts-directory t ""))
 403           ((stringp mh-mime-save-parts-default-directory)
 404            mh-mime-save-parts-default-directory)
 405           (t
 406            mh-mime-save-parts-directory))))
 407     (if (and (equal directory "") mh-mime-save-parts-directory)
 408         (setq directory mh-mime-save-parts-directory))
 409     (if (not (file-directory-p directory))
 410         (message "No directory specified")
 411       (if (equal nil mh-mime-save-parts-default-directory)
 412           (setq mh-mime-save-parts-directory directory))
 413       (with-current-buffer (get-buffer-create mh-log-buffer)
 414         (cd directory)
 415         (setq mh-mime-save-parts-directory directory)
 416         (let ((initial-size (mh-truncate-log-buffer)))
 417           (apply 'call-process
 418                  (expand-file-name command mh-progs) nil t nil
 419                  (mh-list-to-string (list folder msg "-auto"
 420                                           (if (not (mh-variant-p 'nmh))
 421                                               "-store"))))
 422           (if (> (buffer-size) initial-size)
 423               (save-window-excursion
 424                 (switch-to-buffer-other-window mh-log-buffer)
 425                 (sit-for 3))))))))
 426
 427 ;;;###mh-autoload
 428 (defun mh-toggle-mh-decode-mime-flag ()
 429   "Toggle the value of `mh-decode-mime-flag'."
 430   (interactive)
 431   (setq mh-decode-mime-flag (not mh-decode-mime-flag))
 432   (mh-show nil t)
 433   (message "%s" (if mh-decode-mime-flag
 434                     "Processing attachments normally"
 435                   "Displaying raw message")))
 436
 437 ;;;###mh-autoload
 438 (defun mh-toggle-mime-buttons ()
 439   "Toggle option `mh-display-buttons-for-inline-parts-flag'."
 440   (interactive)
 441   (setq mh-display-buttons-for-inline-parts-flag
 442         (not mh-display-buttons-for-inline-parts-flag))
 443   (mh-show nil t))
 444
 445 \f
 446
 447 ;;; MIME Display Routines
 448
 449 (defun mh-mm-inline-message (handle)
 450   "Display message, HANDLE.
 451 The function decodes the message and displays it. It avoids
 452 decoding the same message multiple times."
 453   (let ((b (point))
 454         (clean-message-header mh-clean-message-header-flag)
 455         (invisible-headers mh-invisible-header-fields-compiled)
 456         (visible-headers nil))
 457     (save-excursion
 458       (save-restriction
 459         (narrow-to-region b b)
 460         (mm-insert-part handle)
 461         (mh-mime-display
 462          (or (gethash handle (mh-mime-handles-cache (mh-buffer-data)))
 463              (setf (gethash handle (mh-mime-handles-cache (mh-buffer-data)))
 464                    (let ((handles (mm-dissect-buffer nil)))
 465                      (if handles
 466                          (mh-mm-uu-dissect-text-parts handles)
 467                        (setq handles (mm-uu-dissect)))
 468                      (setf (mh-mime-handles (mh-buffer-data))
 469                            (mh-mm-merge-handles
 470                             handles (mh-mime-handles (mh-buffer-data))))
 471                      handles))))
 472
 473         (goto-char (point-min))
 474         (mh-show-xface)
 475         (cond (clean-message-header
 476                (mh-clean-msg-header (point-min)
 477                                     invisible-headers
 478                                     visible-headers)
 479                (goto-char (point-min)))
 480               (t
 481                (mh-start-of-uncleaned-message)))
 482         (mh-decode-message-header)
 483         (mh-show-addr)
 484         ;; The other highlighting types don't need anything special
 485         (when (eq mh-highlight-citation-style 'gnus)
 486           (mh-gnus-article-highlight-citation))
 487         (goto-char (point-min))
 488         (insert "\n------- Forwarded Message\n\n")
 489         (mh-display-smileys)
 490         (mh-display-emphasis)
 491         (mm-handle-set-undisplayer
 492          handle
 493          `(lambda ()
 494             (let (buffer-read-only)
 495               (if (fboundp 'remove-specifier)
 496                   ;; This is only valid on XEmacs.
 497                   (mapcar (lambda (prop)
 498                             (remove-specifier
 499                              (face-property 'default prop) (current-buffer)))
 500                           '(background background-pixmap foreground)))
 501               (delete-region ,(point-min-marker) ,(point-max-marker)))))))))
 502
 503 ;;;###mh-autoload
 504 (defun mh-decode-message-header ()
 505   "Decode RFC2047 encoded message header fields."
 506   (when mh-decode-mime-flag
 507     (let ((buffer-read-only nil))
 508       (rfc2047-decode-region (point-min) (mh-mail-header-end)))))
 509
 510 ;;;###mh-autoload
 511 (defun mh-decode-message-subject ()
 512   "Decode RFC2047 encoded message header fields."
 513   (when mh-decode-mime-flag
 514     (save-excursion
 515       (let ((buffer-read-only nil))
 516         (rfc2047-decode-region (progn (mh-goto-header-field "Subject:") (point))
 517                                (progn (mh-header-field-end) (point)))))))
 518
 519 ;;;###mh-autoload
 520 (defun mh-mime-display (&optional pre-dissected-handles)
 521   "Display (and possibly decode) MIME handles.
 522 Optional argument, PRE-DISSECTED-HANDLES is a list of MIME
 523 handles. If present they are displayed otherwise the buffer is
 524 parsed and then displayed."
 525   (let ((handles ())
 526         (folder mh-show-folder-buffer)
 527         (raw-message-data (buffer-string)))
 528     (mh-flet
 529      ((mm-handle-set-external-undisplayer
 530        (handle function)
 531        (mh-handle-set-external-undisplayer folder handle function)))
 532      (goto-char (point-min))
 533      (unless (search-forward "\n\n" nil t)
 534        (goto-char (point-max))
 535        (insert "\n\n"))
 536
 537      (condition-case err
 538          (progn
 539            ;; If needed dissect the current buffer
 540            (if pre-dissected-handles
 541                (setq handles pre-dissected-handles)
 542              (if (setq handles (mm-dissect-buffer nil))
 543                  (mh-mm-uu-dissect-text-parts handles)
 544                (setq handles (mm-uu-dissect)))
 545              (setf (mh-mime-handles (mh-buffer-data))
 546                    (mh-mm-merge-handles handles
 547                                         (mh-mime-handles (mh-buffer-data))))
 548              (unless handles
 549                (mh-decode-message-body)))
 550
 551            (cond ((and handles
 552                        (or (not (stringp (car handles)))
 553                            (cdr handles)))
 554                   ;; Go to start of message body
 555                   (goto-char (point-min))
 556                   (or (search-forward "\n\n" nil t)
 557                       (goto-char (point-max)))
 558
 559                   ;; Delete the body
 560                   (delete-region (point) (point-max))
 561
 562                   ;; Display the MIME handles
 563                   (mh-mime-display-part handles))
 564                  (t
 565                   (mh-signature-highlight))))
 566        (error
 567         (message "Could not display body: %s" (error-message-string err))
 568         (delete-region (point-min) (point-max))
 569         (insert raw-message-data))))))
 570
 571 (defun mh-decode-message-body ()
 572   "Decode message based on charset.
 573 If message has been encoded for transfer take that into account."
 574   (let (ct charset cte)
 575     (goto-char (point-min))
 576     (re-search-forward "\n\n" nil t)
 577     (save-restriction
 578       (narrow-to-region (point-min) (point))
 579       (setq ct (ignore-errors (mail-header-parse-content-type
 580                                (message-fetch-field "Content-Type" t)))
 581             charset (mail-content-type-get ct 'charset)
 582             cte (message-fetch-field "Content-Transfer-Encoding")))
 583     (when (stringp cte) (setq cte (mail-header-strip-cte cte)))
 584     (when (or (not ct) (equal (car ct) "text/plain"))
 585       (save-restriction
 586         (narrow-to-region (min (1+ (mh-mail-header-end)) (point-max))
 587                           (point-max))
 588         (mm-decode-body charset
 589                         (and cte (intern (downcase cte)))
 590                         (car ct))))))
 591
 592 (defun mh-mime-display-part (handle)
 593   "Decides the viewer to call based on the type of HANDLE."
 594   (cond ((null handle)
 595          nil)
 596         ((not (stringp (car handle)))
 597          (mh-mime-display-single handle))
 598         ((equal (car handle) "multipart/alternative")
 599          (mh-mime-display-alternative (cdr handle)))
 600         ((and mh-pgp-support-flag
 601               (or (equal (car handle) "multipart/signed")
 602                   (equal (car handle) "multipart/encrypted")))
 603          (mh-mime-display-security handle))
 604         (t
 605          (mh-mime-display-mixed (cdr handle)))))
 606
 607 (defun mh-mime-display-mixed (handles)
 608   "Display the list of MIME parts, HANDLES recursively."
 609   (mapcar #'mh-mime-display-part handles))
 610
 611 (defun mh-mime-display-alternative (handles)
 612   "Choose among the alternatives, HANDLES the part that will be displayed.
 613 If no part is preferred then all the parts are displayed."
 614   (let* ((preferred (mm-preferred-alternative handles))
 615          (others (loop for x in handles unless (eq x preferred) collect x)))
 616     (cond ((and preferred
 617                 (stringp (car preferred)))
 618            (mh-mime-display-part preferred)
 619            (mh-mime-maybe-display-alternatives others))
 620           (preferred
 621            (save-restriction
 622              (narrow-to-region (point) (if (eobp) (point) (1+ (point))))
 623              (mh-mime-display-single preferred)
 624              (mh-mime-maybe-display-alternatives others)
 625              (goto-char (point-max))))
 626           (t
 627            (mh-mime-display-mixed handles)))))
 628
 629 (defun mh-mime-maybe-display-alternatives (alternatives)
 630   "Show buttons for ALTERNATIVES.
 631 If `mh-mime-display-alternatives-flag' is non-nil then display
 632 buttons for alternative parts that are usually suppressed."
 633   (when (and mh-display-buttons-for-alternatives-flag alternatives)
 634     (insert "\n----------------------------------------------------\n")
 635     (insert "Alternatives:\n")
 636     (dolist (x alternatives)
 637       (insert "\n")
 638       (mh-insert-mime-button x (mh-mime-part-index x) nil))
 639     (insert "\n----------------------------------------------------\n")))
 640
 641 (defun mh-mime-display-security (handle)
 642   "Display PGP encrypted/signed message, HANDLE."
 643   (save-restriction
 644     (narrow-to-region (point) (point))
 645     (insert "\n")
 646     (mh-insert-mime-security-button handle)
 647     (mh-mime-display-mixed (cdr handle))
 648     (insert "\n")
 649     (let ((mh-mime-security-button-line-format
 650            mh-mime-security-button-end-line-format))
 651       (mh-insert-mime-security-button handle))
 652     (mh-mm-set-handle-multipart-parameter
 653      handle 'mh-region (cons (point-min-marker) (point-max-marker)))))
 654
 655 (defun mh-mime-display-single (handle)
 656   "Display a leaf node, HANDLE in the MIME tree."
 657   (let* ((type (mm-handle-media-type handle))
 658          (small-image-flag (mh-small-image-p handle))
 659          (attachmentp (equal (car (mm-handle-disposition handle))
 660                              "attachment"))
 661          (inlinep (and (equal (car (mm-handle-disposition handle)) "inline")
 662                        (mm-inlinable-p handle)
 663                        (mm-inlined-p handle)))
 664          (displayp (or inlinep                   ; show if inline OR
 665                        (mh-inline-vcard-p handle);      inline vcard OR
 666                        (and (not attachmentp)    ;      if not an attachment
 667                             (or small-image-flag ;        and small image
 668                                                  ;        and user wants inline
 669                                 (and (not (equal
 670                                            (mm-handle-media-supertype handle)
 671                                            "image"))
 672                                      (mm-inlinable-p handle)
 673                                      (mm-inlined-p handle)))))))
 674     (save-restriction
 675       (narrow-to-region (point) (if (eobp) (point) (1+ (point))))
 676       (cond ((and mh-pgp-support-flag
 677                   (equal type "application/pgp-signature"))
 678              nil)             ; skip signatures as they are already handled...
 679             ((not displayp)
 680              (insert "\n")
 681              (mh-insert-mime-button handle (mh-mime-part-index handle) nil))
 682             ((and displayp
 683                   (not mh-display-buttons-for-inline-parts-flag))
 684              (or (mm-display-part handle)
 685                  (mm-display-part handle))
 686              (mh-signature-highlight handle))
 687             ((and displayp
 688                   mh-display-buttons-for-inline-parts-flag)
 689              (insert "\n")
 690              (mh-insert-mime-button handle (mh-mime-part-index handle) nil)
 691              (forward-line -1)
 692              (mh-mm-display-part handle)))
 693       (goto-char (point-max)))))
 694
 695 ;; There is a bug in Gnus inline image display due to which an extra line
 696 ;; gets inserted every time it is viewed. To work around that problem we are
 697 ;; using an extra property 'mh-region to remember the region that is added
 698 ;; when the button is clicked. The region is then deleted to make sure that
 699 ;; no extra lines get inserted.
 700 (defun mh-mm-display-part (handle)
 701   "Toggle display of button for MIME part, HANDLE."
 702   (beginning-of-line)
 703   (let ((id (get-text-property (point) 'mh-part))
 704         (point (point))
 705         (window (selected-window))
 706         (mail-parse-charset 'nil)
 707         (mail-parse-ignored-charsets nil)
 708         region buffer-read-only)
 709     (save-excursion
 710       (unwind-protect
 711           (let ((win (get-buffer-window (current-buffer) t)))
 712             (when win
 713               (select-window win))
 714             (goto-char point)
 715
 716             (if (mm-handle-displayed-p handle)
 717                 ;; This will remove the part.
 718                 (progn
 719                   ;; Delete the button and displayed part (if any)
 720                   (let ((region (get-text-property point 'mh-region)))
 721                     (when region
 722                       (mh-funcall-if-exists
 723                        remove-images (car region) (cdr region)))
 724                     (mm-display-part handle)
 725                     (when region
 726                       (delete-region (car region) (cdr region))))
 727                   ;; Delete button (if it still remains). This happens for
 728                   ;; externally displayed parts where the previous step does
 729                   ;; nothing.
 730                   (unless (eolp)
 731                     (delete-region (point) (progn (forward-line) (point)))))
 732               (save-restriction
 733                 (delete-region (point) (progn (forward-line 1) (point)))
 734                 (narrow-to-region (point) (point))
 735                 ;; Maybe we need another unwind-protect here.
 736                 (when (equal (mm-handle-media-supertype handle) "image")
 737                   (insert "\n"))
 738                 (when (and (not (eq (ignore-errors (mm-display-part handle))
 739                                     'inline))
 740                            (equal (mm-handle-media-supertype handle)
 741                                   "image"))
 742                   (goto-char (point-min))
 743                   (delete-char 1))
 744                 (when (equal (mm-handle-media-supertype handle) "text")
 745                   (when (eq mh-highlight-citation-style 'gnus)
 746                     (mh-gnus-article-highlight-citation))
 747                   (mh-display-smileys)
 748                   (mh-display-emphasis)
 749                   (mh-signature-highlight handle))
 750                 (setq region (cons (progn (goto-char (point-min))
 751                                           (point-marker))
 752                                    (progn (goto-char (point-max))
 753                                           (point-marker)))))))
 754         (when (window-live-p window)
 755           (select-window window))
 756         (goto-char point)
 757         (beginning-of-line)
 758         (mh-insert-mime-button handle id (mm-handle-displayed-p handle))
 759         (goto-char point)
 760         (when region
 761           (add-text-properties (mh-line-beginning-position)
 762                                (mh-line-end-position)
 763                                `(mh-region ,region)))))))
 764
 765 (defun mh-mime-part-index (handle)
 766   "Generate the button number for MIME part, HANDLE.
 767 Notice that a hash table is used to display the same number when
 768 buttons need to be displayed multiple times (for instance when
 769 nested messages are opened)."
 770   (or (gethash handle (mh-mime-part-index-hash (mh-buffer-data)))
 771       (setf (gethash handle (mh-mime-part-index-hash (mh-buffer-data)))
 772             (incf (mh-mime-parts-count (mh-buffer-data))))))
 773
 774 (defun mh-small-image-p (handle)
 775   "Decide whether HANDLE is a \"small\" image that can be displayed inline.
 776 This is only useful if a Content-Disposition header is not present."
 777   (let ((media-test (caddr (assoc (car (mm-handle-type handle))
 778                                   mh-mm-inline-media-tests)))
 779         (mm-inline-large-images t))
 780     (and media-test
 781          (equal (mm-handle-media-supertype handle) "image")
 782          (funcall media-test handle) ; Since mm-inline-large-images is T,
 783                                         ; this only tells us if the image is
 784                                         ; something that emacs can display
 785          (let* ((image (mm-get-image handle)))
 786            (or (mh-do-in-xemacs
 787                  (and (mh-funcall-if-exists glyphp image)
 788                       (< (glyph-width image)
 789                          (or mh-max-inline-image-width (window-pixel-width)))
 790                       (< (glyph-height image)
 791                          (or mh-max-inline-image-height
 792                              (window-pixel-height)))))
 793                (mh-do-in-gnu-emacs
 794                  (let ((size (mh-funcall-if-exists image-size image)))
 795                    (and size
 796                         (< (cdr size) (or mh-max-inline-image-height
 797                                           (1- (window-height))))
 798                         (< (car size) (or mh-max-inline-image-width
 799                                           (window-width)))))))))))
 800
 801 (defun mh-inline-vcard-p (handle)
 802   "Decide if HANDLE is a vcard that must be displayed inline."
 803   (let ((type (mm-handle-type handle)))
 804     (and (or (featurep 'vcard) (fboundp 'vcard-pretty-print))
 805          (consp type)
 806          (equal (car type) "text/x-vcard")
 807          (save-excursion
 808            (save-restriction
 809              (widen)
 810              (goto-char (point-min))
 811              (not (mh-signature-separator-p)))))))
 812
 813 (defun mh-signature-highlight (&optional handle)
 814   "Highlight message signature in HANDLE.
 815 The optional argument, HANDLE is a MIME handle if the function is
 816 being used to highlight the signature in a MIME part."
 817   (let ((regexp
 818          (cond ((not handle) "^-- $")
 819                ((not (and (equal (mm-handle-media-supertype handle) "text")
 820                           (equal (mm-handle-media-subtype handle) "html")))
 821                 "^-- $")
 822                ((eq (mh-mm-text-html-renderer) 'lynx) "^   --$")
 823                (t "^--$"))))
 824     (save-excursion
 825       (goto-char (point-max))
 826       (when (re-search-backward regexp nil t)
 827         (mh-do-in-gnu-emacs
 828           (let ((ov (make-overlay (point) (point-max))))
 829             (overlay-put ov 'face 'mh-show-signature)
 830             (overlay-put ov 'evaporate t)))
 831         (mh-do-in-xemacs
 832           (set-extent-property (make-extent (point) (point-max))
 833                                'face 'mh-show-signature))))))
 834
 835 \f
 836
 837 ;;; Button Display
 838
 839 ;; Shush compiler.
 840 (mh-do-in-xemacs
 841   (defvar dots)
 842   (defvar type)
 843   (defvar ov))
 844
 845 (defun mh-insert-mime-button (handle index displayed)
 846   "Insert MIME button for HANDLE.
 847 INDEX is the part number that will be DISPLAYED. It is also used
 848 by commands like \"K v\" which operate on individual MIME parts."
 849   ;; The button could be displayed by a previous decode. In that case
 850   ;; undisplay it if we need a hidden button.
 851   (when (and (mm-handle-displayed-p handle) (not displayed))
 852     (mm-display-part handle))
 853   (let ((name (or (mail-content-type-get (mm-handle-type handle) 'name)
 854                   (mail-content-type-get (mm-handle-disposition handle)
 855                                          'filename)
 856                   (mail-content-type-get (mm-handle-type handle) 'url)
 857                   ""))
 858         (type (mm-handle-media-type handle))
 859         (description (mail-decode-encoded-word-string
 860                       (or (mm-handle-description handle) "")))
 861         (dots (if (or displayed (mm-handle-displayed-p handle)) "   " "..."))
 862         long-type begin end)
 863     (if (string-match ".*/" name) (setq name (substring name (match-end 0))))
 864     (setq long-type (concat type (and (not (equal name ""))
 865                                       (concat "; " name))))
 866     (unless (equal description "")
 867       (setq long-type (concat " --- " long-type)))
 868     (unless (bolp) (insert "\n"))
 869     (setq begin (point))
 870     (gnus-eval-format
 871      mh-mime-button-line-format mh-mime-button-line-format-alist
 872      `(,@(mh-gnus-local-map-property mh-mime-button-map)
 873          mh-callback mh-mm-display-part
 874          mh-part ,index
 875          mh-data ,handle))
 876     (setq end (point))
 877     (widget-convert-button
 878      'link begin end
 879      :mime-handle handle
 880      :action 'mh-widget-press-button
 881      :button-keymap mh-mime-button-map
 882      :help-echo
 883      "Mouse-2 click or press RET (in show buffer) to toggle display")
 884     (dolist (ov (mh-funcall-if-exists overlays-in begin end))
 885       (mh-funcall-if-exists overlay-put ov 'evaporate t))))
 886
 887 ;; Shush compiler.
 888 (defvar mm-verify-function-alist)       ; < Emacs 22
 889 (defvar mm-decrypt-function-alist)      ; < Emacs 22
 890 (mh-do-in-xemacs
 891   (defvar pressed-details))
 892
 893 (defun mh-insert-mime-security-button (handle)
 894   "Display buttons for PGP message, HANDLE."
 895   (let* ((protocol (mh-mm-handle-multipart-ctl-parameter handle 'protocol))
 896          (crypto-type (or (nth 2 (assoc protocol mm-verify-function-alist))
 897                           (nth 2 (assoc protocol mm-decrypt-function-alist))
 898                           "Unknown"))
 899          (type (concat crypto-type
 900                        (if (equal (car handle) "multipart/signed")
 901                            " Signed" " Encrypted")
 902                        " Part"))
 903          (info (or (mh-mm-handle-multipart-ctl-parameter handle 'gnus-info)
 904                    "Undecided"))
 905          (details (mh-mm-handle-multipart-ctl-parameter handle 'gnus-details))
 906          pressed-details begin end face)
 907     (setq details (if details (concat "\n" details) ""))
 908     (setq pressed-details (if mh-mime-security-button-pressed details ""))
 909     (setq face (mh-mime-security-button-face info))
 910     (unless (bolp) (insert "\n"))
 911     (setq begin (point))
 912     (gnus-eval-format
 913      mh-mime-security-button-line-format
 914      mh-mime-security-button-line-format-alist
 915      `(,@(mh-gnus-local-map-property mh-mime-security-button-map)
 916          mh-button-pressed ,mh-mime-security-button-pressed
 917          mh-callback mh-mime-security-press-button
 918          mh-line-format ,mh-mime-security-button-line-format
 919          mh-data ,handle))
 920     (setq end (point))
 921     (widget-convert-button 'link begin end
 922                            :mime-handle handle
 923                            :action 'mh-widget-press-button
 924                            :button-keymap mh-mime-security-button-map
 925                            :button-face face
 926                            :help-echo "Mouse-2 click or press RET (in show buffer) to see security details.")
 927     (dolist (ov (mh-funcall-if-exists overlays-in begin end))
 928       (mh-funcall-if-exists overlay-put ov 'evaporate t))
 929     (when (equal info "Failed")
 930       (let* ((type (if (equal (car handle) "multipart/signed")
 931                        "verification" "decryption"))
 932              (warning (if (equal type "decryption")
 933                           "(passphrase may be incorrect)" "")))
 934         (message "%s %s failed %s" crypto-type type warning)))))
 935
 936 (defun mh-mime-security-button-face (info)
 937   "Return the button face to use for encrypted/signed mail based on INFO."
 938   (cond ((string-match "OK" info)       ;Decrypted mail
 939          'mh-show-pgg-good)
 940         ((string-match "Failed" info)   ;Decryption failed or signature invalid
 941          'mh-show-pgg-bad)
 942         ((string-match "Undecided" info);Unprocessed mail
 943          'mh-show-pgg-unknown)
 944         ((string-match "Untrusted" info);Key not trusted
 945          'mh-show-pgg-unknown)
 946         (t
 947          'mh-show-pgg-good)))
 948
 949 \f
 950
 951 ;;; Button Handlers
 952
 953 (defun mh-folder-mime-action (part-index action include-security-flag)
 954   "Go to PART-INDEX and carry out ACTION.
 955
 956 If PART-INDEX is nil then go to the next part in the buffer. The
 957 search for the next buffer wraps around if end of buffer is reached.
 958 If argument INCLUDE-SECURITY-FLAG is non-nil then include security
 959 info buttons when searching for a suitable parts."
 960   (unless mh-showing-mode
 961     (mh-show))
 962   (mh-in-show-buffer (mh-show-buffer)
 963     (let ((criterion
 964            (cond (part-index
 965                   (lambda (p)
 966                     (let ((part (get-text-property p 'mh-part)))
 967                       (and (integerp part) (= part part-index)))))
 968                  (t (lambda (p)
 969                       (if include-security-flag
 970                           (get-text-property p 'mh-data)
 971                         (integerp (get-text-property p 'mh-part)))))))
 972           (point (point)))
 973       (cond ((and (get-text-property point 'mh-part)
 974                   (or (null part-index)
 975                       (= (get-text-property point 'mh-part) part-index)))
 976              (funcall action))
 977             ((and (get-text-property point 'mh-data)
 978                   include-security-flag
 979                   (null part-index))
 980              (funcall action))
 981             (t
 982              (mh-goto-next-button nil criterion)
 983              (if (= (point) point)
 984                  (message "No matching MIME part found")
 985                (funcall action)))))))
 986
 987 ;;;###mh-autoload
 988 (defun mh-goto-next-button (backward-flag &optional criterion)
 989   "Search for next button satisfying criterion.
 990
 991 If BACKWARD-FLAG is non-nil search backward in the buffer for a mime
 992 button.
 993 If CRITERION is a function or a symbol which has a function binding
 994 then that function must return non-nil at the button we stop."
 995   (unless (or (and (symbolp criterion) (fboundp criterion))
 996               (functionp criterion))
 997     (setq criterion (lambda (x) t)))
 998   ;; Move to the next button in the buffer satisfying criterion
 999   (goto-char (or (save-excursion
1000                    (beginning-of-line)
1001                    ;; Find point before current button
1002                    (let ((point-before-current-button
1003                           (save-excursion
1004                             (while (get-text-property (point) 'mh-data)
1005                               (unless (= (forward-line
1006                                           (if backward-flag 1 -1))
1007                                          0)
1008                                 (if backward-flag
1009                                     (goto-char (point-min))
1010                                   (goto-char (point-max)))))
1011                             (point))))
1012                      ;; Skip over current button
1013                      (while (and (get-text-property (point) 'mh-data)
1014                                  (not (if backward-flag (bobp) (eobp))))
1015                        (forward-line (if backward-flag -1 1)))
1016                      ;; Stop at next MIME button if any exists.
1017                      (block loop
1018                        (while (/= (progn
1019                                     (unless (= (forward-line
1020                                                 (if backward-flag -1 1))
1021                                                0)
1022                                       (if backward-flag
1023                                           (goto-char (point-max))
1024                                         (goto-char (point-min)))
1025                                       (beginning-of-line))
1026                                     (point))
1027                                   point-before-current-button)
1028                          (when (and (get-text-property (point) 'mh-data)
1029                                     (funcall criterion (point)))
1030                            (return-from loop (point))))
1031                        nil)))
1032                  (point))))
1033
1034 (defun mh-widget-press-button (widget el)
1035   "Callback for widget, WIDGET.
1036 Parameter EL is unused."
1037   (goto-char (widget-get widget :from))
1038   (mh-press-button))
1039
1040 (defun mh-press-button ()
1041   "View contents of button.
1042
1043 This command is a toggle so if you use it again on the same
1044 attachment, the attachment is hidden."
1045   (interactive)
1046   (let ((mm-inline-media-tests mh-mm-inline-media-tests)
1047         (data (get-text-property (point) 'mh-data))
1048         (function (get-text-property (point) 'mh-callback))
1049         (buffer-read-only nil)
1050         (folder mh-show-folder-buffer))
1051     (mh-flet
1052      ((mm-handle-set-external-undisplayer
1053        (handle function)
1054        (mh-handle-set-external-undisplayer folder handle function)))
1055      (when (and function (eolp))
1056        (backward-char))
1057      (unwind-protect (and function (funcall function data))
1058        (set-buffer-modified-p nil)))))
1059
1060 (defun mh-push-button (event)
1061   "Click MIME button for EVENT.
1062
1063 If the MIME part is visible then it is removed. Otherwise the
1064 part is displayed. This function is called when the mouse is used
1065 to click the MIME button."
1066   (interactive "e")
1067   (mh-do-at-event-location event
1068     (let ((folder mh-show-folder-buffer)
1069           (mm-inline-media-tests mh-mm-inline-media-tests)
1070           (data (get-text-property (point) 'mh-data))
1071           (function (get-text-property (point) 'mh-callback)))
1072       (mh-flet
1073        ((mm-handle-set-external-undisplayer
1074          (handle func)
1075          (mh-handle-set-external-undisplayer folder handle func)))
1076        (and function (funcall function data))))))
1077
1078 (defun mh-handle-set-external-undisplayer (folder handle function)
1079   "Replacement for `mm-handle-set-external-undisplayer'.
1080
1081 This is only called in recent versions of Gnus. The MIME handles
1082 are stored in data structures corresponding to MH-E folder buffer
1083 FOLDER instead of in Gnus (as in the original). The MIME part,
1084 HANDLE is associated with the undisplayer FUNCTION."
1085   (if (mh-mm-keep-viewer-alive-p handle)
1086       (let ((new-handle (copy-sequence handle)))
1087         (mm-handle-set-undisplayer new-handle function)
1088         (mm-handle-set-undisplayer handle nil)
1089         (with-current-buffer folder
1090           (push new-handle (mh-mime-handles (mh-buffer-data)))))
1091     (mm-handle-set-undisplayer handle function)))
1092
1093 (defun mh-mime-security-press-button (handle)
1094   "Callback from security button for part HANDLE."
1095   (if (mh-mm-handle-multipart-ctl-parameter handle 'gnus-info)
1096       (mh-mime-security-show-details handle)
1097     (let ((region (mh-mm-handle-multipart-ctl-parameter handle 'mh-region))
1098           point)
1099       (setq point (point))
1100       (goto-char (car region))
1101       (delete-region (car region) (cdr region))
1102       (with-current-buffer (mh-mm-handle-multipart-ctl-parameter handle 'buffer)
1103         (let* ((mm-verify-option 'known)
1104                (mm-decrypt-option 'known)
1105                (new (mh-mm-possibly-verify-or-decrypt (cdr handle) handle)))
1106           (unless (eq new (cdr handle))
1107             (mh-mm-destroy-parts (cdr handle))
1108             (setcdr handle new))))
1109       (mh-mime-display-security handle)
1110       (goto-char point))))
1111
1112 ;; I rewrote the security part because Gnus doesn't seem to ever minimize
1113 ;; the button. That is once the mime-security button is pressed there seems
1114 ;; to be no way of getting rid of the inserted text.
1115 (defun mh-mime-security-show-details (handle)
1116   "Toggle display of detailed security info for HANDLE."
1117   (let ((details (mh-mm-handle-multipart-ctl-parameter handle 'gnus-details)))
1118     (when details
1119       (let ((mh-mime-security-button-pressed
1120              (not (get-text-property (point) 'mh-button-pressed)))
1121             (mh-mime-security-button-line-format
1122              (get-text-property (point) 'mh-line-format)))
1123         (forward-char -1)
1124         (while (eq (get-text-property (point) 'mh-line-format)
1125                    mh-mime-security-button-line-format)
1126           (forward-char -1))
1127         (forward-char)
1128         (save-restriction
1129           (narrow-to-region (point) (point))
1130           (mh-insert-mime-security-button handle))
1131         (delete-region
1132          (point)
1133          (or (text-property-not-all
1134               (point) (point-max)
1135               'mh-line-format mh-mime-security-button-line-format)
1136              (point-max)))
1137         (forward-line -1)))))
1138
1139 \f
1140
1141 ;;; Miscellaneous Article Washing
1142
1143 ;;;###mh-autoload
1144 (defun mh-add-missing-mime-version-header ()
1145   "Some mail programs don't put a MIME-Version header.
1146 I have seen this only in spam, so maybe we shouldn't fix
1147 this ;-)"
1148   (save-excursion
1149     (goto-char (point-min))
1150     (re-search-forward "\n\n" nil t)
1151     (save-restriction
1152       (narrow-to-region (point-min) (point))
1153       (when (and (message-fetch-field "content-type")
1154                  (not (message-fetch-field "mime-version")))
1155         (goto-char (point-min))
1156         (insert "MIME-Version: 1.0\n")))))
1157
1158 ;;;###mh-autoload
1159 (defun mh-display-smileys ()
1160   "Display smileys."
1161   (when (and mh-graphical-smileys-flag (mh-small-show-buffer-p))
1162     (mh-funcall-if-exists smiley-region (point-min) (point-max))))
1163
1164 ;;;###mh-autoload
1165 (defun mh-display-emphasis ()
1166   "Display graphical emphasis."
1167   (when (and mh-graphical-emphasis-flag (mh-small-show-buffer-p))
1168     (mh-flet
1169      ((article-goto-body ()))      ; shadow this function to do nothing
1170      (save-excursion
1171        (goto-char (point-min))
1172        (article-emphasize)))))
1173
1174 (defun mh-small-show-buffer-p ()
1175   "Check if show buffer is small.
1176 This is used to decide if smileys and graphical emphasis should be
1177 displayed."
1178   (let ((max nil))
1179     (when (and (boundp 'font-lock-maximum-size) font-lock-maximum-size)
1180       (cond ((numberp font-lock-maximum-size)
1181              (setq max font-lock-maximum-size))
1182             ((listp font-lock-maximum-size)
1183              (setq max (cdr (or (assoc 'mh-show-mode font-lock-maximum-size)
1184                                 (assoc t font-lock-maximum-size)))))))
1185     (or (not (numberp max)) (>= (/ max 8) (buffer-size)))))
1186
1187 \f
1188
1189 ;;; MH-Letter Commands
1190
1191 ;; MH-E commands are alphabetical; specific support routines follow command.
1192
1193 ;;;###mh-autoload
1194 (defun mh-compose-forward (&optional description folder range)
1195   "Add tag to forward a message.
1196
1197 You are prompted for a content DESCRIPTION, the name of the
1198 FOLDER in which the messages to forward are located, and a RANGE
1199 of messages, which defaults to the current message in that
1200 folder. Check the documentation of `mh-interactive-range' to see
1201 how RANGE is read in interactive use.
1202
1203 The option `mh-compose-insertion' controls what type of tags are inserted."
1204   (interactive
1205    (let* ((description
1206            (mml-minibuffer-read-description))
1207           (folder
1208            (mh-prompt-for-folder "Message from"
1209                                  mh-sent-from-folder nil))
1210           (default
1211             (if (and (equal folder mh-sent-from-folder)
1212                      (numberp mh-sent-from-msg))
1213                 mh-sent-from-msg
1214               (nth 0 (mh-translate-range folder "cur"))))
1215           (range
1216            (mh-read-range "Forward" folder
1217                           (or (and default
1218                                    (number-to-string default))
1219                               t)
1220                           t t)))
1221      (list description folder range)))
1222   (let ((messages (mapconcat 'identity (mh-list-to-string range) " ")))
1223     (dolist (message (mh-translate-range folder messages))
1224       (if (equal mh-compose-insertion 'mml)
1225           (mh-mml-forward-message description folder (format "%s" message))
1226         (mh-mh-forward-message description folder (format "%s" message))))))
1227
1228 ;;;###mh-autoload
1229 (defun mh-mml-forward-message (description folder message)
1230   "Forward a message as attachment.
1231
1232 The function will prompt the user for a DESCRIPTION, a FOLDER and
1233 MESSAGE number."
1234   (let ((msg (if (and (equal message "") (numberp mh-sent-from-msg))
1235                  mh-sent-from-msg
1236                (string-to-number message))))
1237     (cond ((integerp msg)
1238            (mml-attach-file (format "%s%s/%d"
1239                                     mh-user-path (substring folder 1) msg)
1240                             "message/rfc822"
1241                             (if (string= "" description) nil description)
1242                             "inline"))
1243           (t (error "The message number, %s, is not a integer" msg)))))
1244
1245 (defun mh-mh-forward-message (&optional description folder messages)
1246   "Add tag to forward a message.
1247 You are prompted for a content DESCRIPTION, the name of the
1248 FOLDER in which the messages to forward are located, and the
1249 MESSAGES' numbers.
1250
1251 See also \\[mh-mh-to-mime]."
1252   (interactive (list
1253                 (mml-minibuffer-read-description)
1254                 (mh-prompt-for-folder "Message from" mh-sent-from-folder nil)
1255                 (read-string (concat "Messages"
1256                                      (if (numberp mh-sent-from-msg)
1257                                          (format " (default %d): "
1258                                                  mh-sent-from-msg)
1259                                        ": ")))))
1260   (beginning-of-line)
1261   (insert "#forw [")
1262   (and description
1263        (not (string= description ""))
1264        (insert description))
1265   (insert "]")
1266   (and folder
1267        (not (string= folder ""))
1268        (insert " " folder))
1269   (if (and messages
1270            (not (string= messages "")))
1271       (let ((start (point)))
1272         (insert " " messages)
1273         (subst-char-in-region start (point) ?, ? ))
1274     (if (numberp mh-sent-from-msg)
1275         (insert " " (int-to-string mh-sent-from-msg))))
1276   (insert "\n"))
1277
1278 ;;;###mh-autoload
1279 (defun mh-compose-insertion (&optional inline)
1280   "Add tag to include a file such as an image or sound.
1281
1282 You are prompted for the filename containing the object, the
1283 media type if it cannot be determined automatically, and a
1284 content description. If you're using MH-style directives, you
1285 will also be prompted for additional attributes.
1286
1287 The option `mh-compose-insertion' controls what type of tags are
1288 inserted. Optional argument INLINE means make it an inline
1289 attachment."
1290   (interactive "P")
1291   (if (equal mh-compose-insertion 'mml)
1292       (if inline
1293           (mh-mml-attach-file "inline")
1294         (mh-mml-attach-file))
1295     (call-interactively 'mh-mh-attach-file)))
1296
1297 (defun mh-mml-attach-file (&optional disposition)
1298   "Add a tag to insert a MIME message part from a file.
1299
1300 You are prompted for the filename containing the object, the
1301 media type if it cannot be determined automatically, a content
1302 description and the DISPOSITION of the attachment.
1303
1304 This is basically `mml-attach-file' from Gnus, modified such that a prefix
1305 argument yields an \"inline\" disposition and Content-Type is determined
1306 automatically."
1307   (let* ((file (mml-minibuffer-read-file "Attach file: "))
1308          (type (mh-minibuffer-read-type file))
1309          (description (mml-minibuffer-read-description))
1310          (dispos (or disposition
1311                      (mh-mml-minibuffer-read-disposition type))))
1312     (mml-insert-empty-tag 'part 'type type 'filename file
1313                           'disposition dispos 'description description)))
1314
1315 (defun mh-mh-attach-file (filename type description attributes)
1316   "Add a tag to insert a MIME message part from a file.
1317 You are prompted for the FILENAME containing the object, the
1318 media TYPE if it cannot be determined automatically, and a
1319 content DESCRIPTION. In addition, you are also prompted for
1320 additional ATTRIBUTES.
1321
1322 See also \\[mh-mh-to-mime]."
1323   (interactive (let ((filename (mml-minibuffer-read-file "Attach file: ")))
1324                  (list
1325                   filename
1326                   (mh-minibuffer-read-type filename)
1327                   (mml-minibuffer-read-description)
1328                   (read-string "Attributes: "
1329                                (concat "name=\""
1330                                        (file-name-nondirectory filename)
1331                                        "\"")))))
1332   (mh-mh-compose-type filename type description attributes))
1333
1334 (defun mh-mh-compose-type (filename type
1335                                      &optional description attributes comment)
1336   "Insert an MH-style directive to insert a file.
1337 The file specified by FILENAME is encoded as TYPE. An optional
1338 DESCRIPTION is used as the Content-Description field, optional
1339 set of ATTRIBUTES and an optional COMMENT can also be included."
1340   (beginning-of-line)
1341   (insert "#" type)
1342   (and attributes
1343        (insert "; " attributes))
1344   (and comment
1345        (insert " (" comment ")"))
1346   (insert " [")
1347   (and description
1348        (insert description))
1349   (insert "] " (expand-file-name filename))
1350   (insert "\n"))
1351
1352 ;;;###mh-autoload
1353 (defun mh-mh-compose-anon-ftp (host filename type description)
1354   "Add tag to include anonymous ftp reference to a file.
1355
1356 You can have your message initiate an \"ftp\" transfer when the
1357 recipient reads the message. You are prompted for the remote HOST
1358 and FILENAME, the media TYPE, and the content DESCRIPTION.
1359
1360 See also \\[mh-mh-to-mime]."
1361   (interactive (list
1362                 (read-string "Remote host: ")
1363                 (read-string "Remote filename: ")
1364                 (mh-minibuffer-read-type "DUMMY-FILENAME")
1365                 (mml-minibuffer-read-description)))
1366   (mh-mh-compose-external-type "anon-ftp" host filename
1367                                type description))
1368
1369 ;;;###mh-autoload
1370 (defun mh-mh-compose-external-compressed-tar (host filename description)
1371   "Add tag to include anonymous ftp reference to a compressed tar file.
1372
1373 In addition to retrieving the file via anonymous \"ftp\" as per
1374 the command \\[mh-mh-compose-anon-ftp], the file will also be
1375 uncompressed and untarred. You are prompted for the remote HOST
1376 and FILENAME and the content DESCRIPTION.
1377
1378 See also \\[mh-mh-to-mime]."
1379   (interactive (list
1380                 (read-string "Remote host: ")
1381                 (read-string "Remote filename: ")
1382                 (mml-minibuffer-read-description)))
1383   (mh-mh-compose-external-type "anon-ftp" host filename
1384                                "application/octet-stream"
1385                                description
1386                                "type=tar; conversions=x-compress"
1387                                "mode=image"))
1388
1389 ;; RFC 2045 - Multipurpose Internet Mail Extensions (MIME) Part One:
1390 ;;            Format of Internet Message Bodies.
1391 ;; RFC 2046 - Multipurpose Internet Mail Extensions (MIME) Part Two:
1392 ;;            Media Types.
1393 ;; RFC 2049 - Multipurpose Internet Mail Extensions (MIME) Part Five:
1394 ;;            Conformance Criteria and Examples.
1395 ;; RFC 2017 - Definition of the URL MIME External-Body Access-Type
1396 ;; RFC 1738 - Uniform Resource Locators (URL)
1397 (defvar mh-access-types
1398   '(("anon-ftp")        ; RFC2046 Anonymous File Transfer Protocol
1399     ("file")            ; RFC1738 Host-specific file names
1400     ("ftp")             ; RFC2046 File Transfer Protocol
1401     ("gopher")          ; RFC1738 The Gopher Protocol
1402     ("http")            ; RFC1738 Hypertext Transfer Protocol
1403     ("local-file")      ; RFC2046 Local file access
1404     ("mail-server")     ; RFC2046 mail-server Electronic mail address
1405     ("mailto")          ; RFC1738 Electronic mail address
1406     ("news")            ; RFC1738 Usenet news
1407     ("nntp")            ; RFC1738 Usenet news using NNTP access
1408     ("prospero")        ; RFC1738 Prospero Directory Service
1409     ("telnet")          ; RFC1738 Telnet
1410     ("tftp")            ; RFC2046 Trivial File Transfer Protocol
1411     ("url")             ; RFC2017 URL scheme MIME access-type Protocol
1412     ("wais"))           ; RFC1738 Wide Area Information Servers
1413   "Valid MIME access-type values.")
1414
1415 ;;;###mh-autoload
1416 (defun mh-mh-compose-external-type (access-type host filename type
1417                                                 &optional description
1418                                                 attributes parameters
1419                                                 comment)
1420   "Add tag to refer to a remote file.
1421
1422 This command is a general utility for referencing external files.
1423 In fact, all of the other commands that insert directives to
1424 access external files call this command. You are prompted for the
1425 ACCESS-TYPE, remote HOST and FILENAME, and content TYPE. If you
1426 provide a prefix argument, you are also prompted for a content
1427 DESCRIPTION, ATTRIBUTES, PARAMETERS, and a COMMENT.
1428
1429 See also \\[mh-mh-to-mime]."
1430   (interactive (list
1431                 (completing-read "Access type: " mh-access-types)
1432                 (read-string "Remote host: ")
1433                 (read-string "Remote filename: ")
1434                 (mh-minibuffer-read-type "DUMMY-FILENAME")
1435                 (if current-prefix-arg (mml-minibuffer-read-description))
1436                 (if current-prefix-arg (read-string "Attributes: "))
1437                 (if current-prefix-arg (read-string "Parameters: "))
1438                 (if current-prefix-arg (read-string "Comment: "))))
1439   (beginning-of-line)
1440   (insert "#@" type)
1441   (and attributes
1442        (insert "; " attributes))
1443   (and comment
1444        (insert " (" comment ") "))
1445   (insert " [")
1446   (and description
1447        (insert description))
1448   (insert "] ")
1449   (insert "access-type=" access-type "; ")
1450   (insert "site=" host)
1451   (insert "; name=" (file-name-nondirectory filename))
1452   (let ((directory (file-name-directory filename)))
1453     (and directory
1454          (insert "; directory=\"" directory "\"")))
1455   (and parameters
1456        (insert "; " parameters))
1457   (insert "\n"))
1458
1459 (defvar mh-mh-to-mime-args nil
1460   "Extra arguments for \\[mh-mh-to-mime] to pass to the \"mhbuild\" command.
1461 The arguments are passed to \"mhbuild\" if \\[mh-mh-to-mime] is
1462 given a prefix argument. Normally default arguments to
1463 \"mhbuild\" are specified in the MH profile.")
1464
1465 ;;;###mh-autoload
1466 (defun mh-mh-to-mime (&optional extra-args)
1467   "Compose MIME message from MH-style directives.
1468
1469 Typically, you send a message with attachments just like any other
1470 message. However, you may take a sneak preview of the MIME encoding if
1471 you wish by running this command.
1472
1473 If you wish to pass additional arguments to \"mhbuild\" (\"mhn\")
1474 to affect how it builds your message, use the option
1475 `mh-mh-to-mime-args'. For example, you can build a consistency
1476 check into the message by setting `mh-mh-to-mime-args' to
1477 \"-check\". The recipient of your message can then run \"mhbuild
1478 -check\" on the message--\"mhbuild\" (\"mhn\") will complain if
1479 the message has been corrupted on the way. This command only
1480 consults this option when given a prefix argument EXTRA-ARGS.
1481
1482 The hook `mh-mh-to-mime-hook' is called after the message has been
1483 formatted.
1484
1485 The effects of this command can be undone by running
1486 \\[mh-mh-to-mime-undo]."
1487   (interactive "*P")
1488   (mh-mh-quote-unescaped-sharp)
1489   (save-buffer)
1490   (message "Running %s..." (if (mh-variant-p 'nmh) "mhbuild" "mhn"))
1491   (cond
1492    ((mh-variant-p 'nmh)
1493     (mh-exec-cmd-error nil
1494                        "mhbuild"
1495                        (if extra-args mh-mh-to-mime-args)
1496                        buffer-file-name))
1497    (t
1498     (mh-exec-cmd-error (format "mhdraft=%s" buffer-file-name)
1499                        "mhn"
1500                        (if extra-args mh-mh-to-mime-args)
1501                        buffer-file-name)))
1502   (revert-buffer t t t)
1503   (message "Running %s...done" (if (mh-variant-p 'nmh) "mhbuild" "mhn"))
1504   (run-hooks 'mh-mh-to-mime-hook))
1505
1506 (defun mh-mh-quote-unescaped-sharp ()
1507   "Quote \"#\" characters that haven't been quoted for \"mhbuild\".
1508 If the \"#\" character is present in the first column, but it isn't
1509 part of a MH-style directive then \"mhbuild\" gives an error.
1510 This function will quote all such characters."
1511   (save-excursion
1512     (goto-char (point-min))
1513     (while (re-search-forward "^#" nil t)
1514       (beginning-of-line)
1515       (unless (mh-mh-directive-present-p (point) (mh-line-end-position))
1516         (insert "#"))
1517       (goto-char (mh-line-end-position)))))
1518
1519 ;;;###mh-autoload
1520 (defun mh-mh-to-mime-undo (noconfirm)
1521   "Undo effects of \\[mh-mh-to-mime].
1522
1523 It does this by reverting to a backup file. You are prompted to
1524 confirm this action, but you can avoid the confirmation by adding
1525 a prefix argument NOCONFIRM."
1526   (interactive "*P")
1527   (if (null buffer-file-name)
1528       (error "Buffer does not seem to be associated with any file"))
1529   (let ((backup-strings '("," "#"))
1530         backup-file)
1531     (while (and backup-strings
1532                 (not (file-exists-p
1533                       (setq backup-file
1534                             (concat (file-name-directory buffer-file-name)
1535                                     (car backup-strings)
1536                                     (file-name-nondirectory buffer-file-name)
1537                                     ".orig")))))
1538       (setq backup-strings (cdr backup-strings)))
1539     (or backup-strings
1540         (error "Backup file for %s no longer exists" buffer-file-name))
1541     (or noconfirm
1542         (yes-or-no-p (format "Revert buffer from file %s? "
1543                              backup-file))
1544         (error "Revert not confirmed"))
1545     (let ((buffer-read-only nil))
1546       (erase-buffer)
1547       (insert-file-contents backup-file))
1548     (after-find-file nil nil nil nil t)))
1549
1550 ;; Shush compiler.
1551 (defvar mh-identity-pgg-default-user-id)
1552
1553 ;;;###mh-autoload
1554 (defun mh-mml-secure-message-encrypt (method)
1555   "Add tag to encrypt the message.
1556
1557 A proper multipart message is created for you when you send the
1558 message. Use the command \\[mh-mml-unsecure-message] to remove
1559 this tag. Use a prefix argument METHOD to be prompted for one of
1560 the possible security methods (see `mh-mml-method-default')."
1561   (interactive (list (mh-mml-query-cryptographic-method)))
1562   (mh-secure-message method "encrypt" mh-identity-pgg-default-user-id))
1563
1564 ;;;###mh-autoload
1565 (defun mh-mml-secure-message-sign (method)
1566   "Add tag to sign the message.
1567
1568 A proper multipart message is created for you when you send the
1569 message. Use the command \\[mh-mml-unsecure-message] to remove
1570 this tag. Use a prefix argument METHOD to be prompted for one of
1571 the possible security methods (see `mh-mml-method-default')."
1572   (interactive (list (mh-mml-query-cryptographic-method)))
1573   (mh-secure-message method "sign" mh-identity-pgg-default-user-id))
1574
1575 ;;;###mh-autoload
1576 (defun mh-mml-secure-message-signencrypt (method)
1577   "Add tag to encrypt and sign the message.
1578
1579 A proper multipart message is created for you when you send the
1580 message. Use the command \\[mh-mml-unsecure-message] to remove
1581 this tag. Use a prefix argument METHOD to be prompted for one of
1582 the possible security methods (see `mh-mml-method-default')."
1583   (interactive (list (mh-mml-query-cryptographic-method)))
1584   (mh-secure-message method "signencrypt" mh-identity-pgg-default-user-id))
1585
1586 (defvar mh-mml-cryptographic-method-history ())
1587
1588 (defun mh-mml-query-cryptographic-method ()
1589   "Read the cryptographic method to use."
1590   (if current-prefix-arg
1591       (let ((def (or (car mh-mml-cryptographic-method-history)
1592                      mh-mml-method-default)))
1593         (completing-read (format "Method (default %s): " def)
1594                          '(("pgp") ("pgpmime") ("smime"))
1595                          nil t nil 'mh-mml-cryptographic-method-history def))
1596     mh-mml-method-default))
1597
1598 (defun mh-secure-message (method mode &optional identity)
1599   "Add tag to encrypt or sign message.
1600
1601 METHOD should be one of: \"pgpmime\", \"pgp\", \"smime\".
1602 MODE should be one of: \"sign\", \"encrypt\", \"signencrypt\", \"none\".
1603 IDENTITY is optionally the default-user-id to use."
1604   (if (not mh-pgp-support-flag)
1605       (error "Your version of Gnus does not support PGP/GPG")
1606     ;; Check the arguments
1607     (let ((valid-methods (list "pgpmime" "pgp" "smime"))
1608           (valid-modes (list "sign" "encrypt" "signencrypt" "none")))
1609       (if (not (member method valid-methods))
1610           (error "Method %s is invalid" method))
1611       (if (not (member mode valid-modes))
1612           (error "Mode %s is invalid" mode))
1613       (mml-unsecure-message)
1614       (if (not (string= mode "none"))
1615         (save-excursion
1616           (goto-char (point-min))
1617           (mh-goto-header-end 1)
1618           (if mh-identity-pgg-default-user-id
1619               (mml-insert-tag 'secure 'method method 'mode mode
1620                               'sender mh-identity-pgg-default-user-id)
1621             (mml-insert-tag 'secure 'method method 'mode mode)))))))
1622
1623 ;;;###mh-autoload
1624 (defun mh-mml-to-mime ()
1625   "Compose MIME message from MML tags.
1626
1627 Typically, you send a message with attachments just like any
1628 other message. However, you may take a sneak preview of the MIME
1629 encoding if you wish by running this command.
1630
1631 This action can be undone by running \\[undo]."
1632   (interactive)
1633   (require 'message)
1634   (when mh-pgp-support-flag
1635     ;; PGP requires actual e-mail addresses, not aliases.
1636     ;; Parse the recipients and sender from the message.
1637     (message-options-set-recipient)
1638     ;; Do an alias lookup on sender (if From field is present).
1639     (when (message-options-get 'message-sender)
1640       (message-options-set 'message-sender
1641                            (mail-strip-quoted-names
1642                             (mh-alias-expand
1643                              (message-options-get 'message-sender)))))
1644     ;; Do an alias lookup on recipients
1645     (message-options-set 'message-recipients
1646                          (mapconcat
1647                           (lambda (ali)
1648                             (mail-strip-quoted-names (mh-alias-expand ali)))
1649                           (split-string (message-options-get 'message-recipients) "[, ]+")
1650                           ", ")))
1651   (let ((saved-text (buffer-string))
1652         (buffer (current-buffer))
1653         (modified-flag (buffer-modified-p)))
1654     (condition-case err (mml-to-mime)
1655       (error
1656        (with-current-buffer buffer
1657          (delete-region (point-min) (point-max))
1658          (insert saved-text)
1659          (set-buffer-modified-p modified-flag))
1660        (error (error-message-string err))))))
1661
1662 ;;;###mh-autoload
1663 (defun mh-mml-unsecure-message ()
1664   "Remove any secure message tags."
1665   (interactive)
1666   (if (not mh-pgp-support-flag)
1667       (error "Your version of Gnus does not support PGP/GPG")
1668     (mml-unsecure-message)))
1669
1670 \f
1671
1672 ;;; Support Routines for MH-Letter Commands
1673
1674 ;;;###mh-autoload
1675 (defun mh-mml-tag-present-p ()
1676   "Check if the current buffer has text which may be a MML tag."
1677   (save-excursion
1678     (goto-char (point-min))
1679     (re-search-forward
1680      (concat
1681       "\\(<#\\(mml\\|part\\)\\(.\\|\n\\)*>[ \n\t]*<#/\\(mml\\|part\\)>\\|"
1682       "^<#secure.+>$\\)")
1683      nil t)))
1684
1685 (defvar mh-media-type-regexp
1686   (concat (regexp-opt '("text" "image" "audio" "video" "application"
1687                         "multipart" "message") t)
1688           "/[-.+a-zA-Z0-9]+")
1689   "Regexp matching valid media types used in MIME attachment compositions.")
1690
1691 ;;;###mh-autoload
1692 (defun mh-mh-directive-present-p (&optional begin end)
1693   "Check if the text between BEGIN and END might be a MH-style directive.
1694 The optional argument BEGIN defaults to the beginning of the
1695 buffer, while END defaults to the end of the buffer."
1696   (unless begin (setq begin (point-min)))
1697   (unless end (setq end (point-max)))
1698   (save-excursion
1699     (block search-for-mh-directive
1700       (goto-char begin)
1701       (while (re-search-forward "^#" end t)
1702         (let ((s (buffer-substring-no-properties
1703                   (point) (mh-line-end-position))))
1704           (cond ((equal s ""))
1705                 ((string-match "^forw[ \t\n]+" s)
1706                  (return-from search-for-mh-directive t))
1707                 (t (let ((first-token (car (split-string s "[ \t;@]"))))
1708                      (when (and first-token
1709                                 (string-match mh-media-type-regexp
1710                                               first-token))
1711                        (return-from search-for-mh-directive t)))))))
1712       nil)))
1713
1714 (defun mh-minibuffer-read-type (filename &optional default)
1715   "Return the content type associated with the given FILENAME.
1716 If the \"file\" command exists and recognizes the given file,
1717 then its value is returned; otherwise, the user is prompted for
1718 a type (see `mailcap-mime-types').
1719 Optional argument DEFAULT is returned if a type isn't entered."
1720   (mailcap-parse-mimetypes)
1721   (let* ((default (or default
1722                       (mm-default-file-encoding filename)
1723                       "application/octet-stream"))
1724          (probed-type (mh-file-mime-type filename))
1725          (type (or (and (not (equal probed-type "application/octet-stream"))
1726                         probed-type)
1727                    (completing-read
1728                     (format "Content type (default %s): " default)
1729                     (mapcar 'list (mailcap-mime-types))))))
1730     (if (not (equal type ""))
1731         type
1732       default)))
1733
1734 ;;;###mh-autoload
1735 (defun mh-file-mime-type (filename)
1736   "Return MIME type of FILENAME from file command.
1737 Returns nil if file command not on system."
1738   (cond
1739    ((not (mh-have-file-command))
1740     nil)                                ;no file command, exit now
1741    ((not (and (file-exists-p filename)
1742               (file-readable-p filename)))
1743     nil)                               ;no file or not readable, ditto
1744    (t
1745     (let ((tmp-buffer (get-buffer-create mh-temp-buffer)))
1746       (with-current-buffer tmp-buffer
1747         (unwind-protect
1748             (progn
1749               (call-process "file" nil '(t nil) nil "-b" "-i"
1750                             (expand-file-name filename))
1751               (goto-char (point-min))
1752               (if (not (re-search-forward mh-media-type-regexp nil t))
1753                   nil
1754                 (mh-file-mime-type-substitute (match-string 0) filename)))
1755           (kill-buffer tmp-buffer)))))))
1756
1757 (defvar mh-file-mime-type-substitutions
1758   '(("application/msword" "\\.xls" "application/ms-excel")
1759     ("application/msword" "\\.ppt" "application/ms-powerpoint")
1760     ("text/plain" "\\.vcf" "text/x-vcard")
1761     ("text/rtf" "\\.rtf" "application/rtf")
1762     ("application/x-zip" "\\.sxc" "application/vnd.sun.xml.calc")
1763     ("application/x-zip" "\\.sxd" "application/vnd.sun.xml.draw")
1764     ("application/x-zip" "\\.sxi" "application/vnd.sun.xml.impress")
1765     ("application/x-zip" "\\.sxw" "application/vnd.sun.xml.writer")
1766     ("application/x-zip" "\\.odg" "application/vnd.oasis.opendocument.graphics")
1767     ("application/x-zip" "\\.odi" "application/vnd.oasis.opendocument.image")
1768     ("application/x-zip" "\\.odp"
1769      "application/vnd.oasis.opendocument.presentation")
1770     ("application/x-zip" "\\.ods"
1771      "application/vnd.oasis.opendocument.spreadsheet")
1772     ("application/x-zip" "\\.odt" "application/vnd.oasis.opendocument.text"))
1773   "Substitutions to make for Content-Type returned from file command.
1774 The first element is the Content-Type returned by the file command.
1775 The second element is a regexp matching the file name, usually the
1776 extension.
1777 The third element is the Content-Type to replace with.")
1778
1779 (defun mh-file-mime-type-substitute (content-type filename)
1780   "Return possibly changed CONTENT-TYPE on the FILENAME.
1781 Substitutions are made from the `mh-file-mime-type-substitutions'
1782 variable."
1783   (let ((subst mh-file-mime-type-substitutions)
1784         (type) (match) (answer content-type)
1785         (case-fold-search t))
1786     (while subst
1787       (setq type (car (car subst))
1788             match (elt (car subst) 1))
1789       (if (and (string-equal content-type type)
1790                (string-match match filename))
1791           (setq answer (elt (car subst) 2)
1792                 subst nil)
1793         (setq subst (cdr subst))))
1794     answer))
1795
1796 (defvar mh-have-file-command 'undefined
1797   "Cached value of function `mh-have-file-command'.
1798 Do not reference this variable directly as it might not have been
1799 initialized. Always use the command `mh-have-file-command'.")
1800
1801 ;;;###mh-autoload
1802 (defun mh-have-file-command ()
1803   "Return t if `file' command is on the system.
1804 'file -i' is used to get MIME type of composition insertion."
1805   (when (eq mh-have-file-command 'undefined)
1806     (setq mh-have-file-command
1807           (and (fboundp 'executable-find)
1808                (executable-find "file") ; file command exists
1809                                         ;   and accepts -i and -b args.
1810                (zerop (call-process "file" nil nil nil "-i" "-b"
1811                                     (expand-file-name "inc" mh-progs))))))
1812   mh-have-file-command)
1813
1814 \f
1815
1816 ;;; MIME Cleanup
1817
1818 ;;;###mh-autoload
1819 (defun mh-mime-cleanup ()
1820   "Free the decoded MIME parts."
1821   (let ((mime-data (gethash (current-buffer) mh-globals-hash)))
1822     ;; This is for Emacs, what about XEmacs?
1823     (mh-funcall-if-exists remove-images (point-min) (point-max))
1824     (when mime-data
1825       (mh-mm-destroy-parts (mh-mime-handles mime-data))
1826       (remhash (current-buffer) mh-globals-hash))))
1827
1828 ;;;###mh-autoload
1829 (defun mh-destroy-postponed-handles ()
1830   "Free MIME data for externally displayed MIME parts."
1831   (let ((mime-data (mh-buffer-data)))
1832     (when mime-data
1833       (mh-mm-destroy-parts (mh-mime-handles mime-data)))
1834     (remhash (current-buffer) mh-globals-hash)))
1835
1836 (provide 'mh-mime)
1837
1838 ;; Local Variables:
1839 ;; indent-tabs-mode: nil
1840 ;; sentence-end-double-space: nil
1841 ;; End:
1842
1843 ;;; mh-mime.el ends here