lisp/mh-e/mh-mime.el

   1 ;;; mh-mime.el --- MH-E MIME support
   2
   3 ;; Copyright (C) 1993, 1995, 2001-2011  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 "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          (flet ((mm-handle-set-external-undisplayer (handle function)
 272                   (mh-handle-set-external-undisplayer folder handle function)))
 273            (unwind-protect (mm-display-external part method)
 274              (set-buffer-modified-p nil)))))
 275    nil))
 276
 277 ;;;###mh-autoload
 278 (defun mh-folder-inline-mime-part (part-index)
 279   "Show attachment verbatim.
 280
 281 You can view the raw contents of an attachment with this command.
 282 This command displays (or hides) the contents of the attachment
 283 associated with the button under the cursor verbatim. If the
 284 cursor is not located over a button, then the cursor first moves
 285 to the next button, wrapping to the beginning of the message if
 286 necessary.
 287
 288 You can also provide a numeric prefix argument PART-INDEX to view
 289 the attachment labeled with that number."
 290   (interactive "P")
 291   (when (consp part-index) (setq part-index (car part-index)))
 292   (mh-folder-mime-action part-index #'mh-mime-inline-part nil))
 293
 294 (defun mh-mime-inline-part ()
 295   "Toggle display of the raw MIME part."
 296   (interactive)
 297   (let* ((buffer-read-only nil)
 298          (data (get-text-property (point) 'mh-data))
 299          (inserted-flag (get-text-property (point) 'mh-mime-inserted))
 300          (displayed-flag (mm-handle-displayed-p data))
 301          (point (point))
 302          start end)
 303     (cond ((and data (not inserted-flag) (not displayed-flag))
 304            (let ((contents (mm-get-part data)))
 305              (add-text-properties (mh-line-beginning-position)
 306                                   (mh-line-end-position) '(mh-mime-inserted t))
 307              (setq start (point-marker))
 308              (forward-line 1)
 309              (mm-insert-inline data contents)
 310              (setq end (point-marker))
 311              (add-text-properties
 312               start (progn (goto-char start) (mh-line-end-position))
 313               `(mh-region (,start . ,end)))))
 314           ((and data (or inserted-flag displayed-flag))
 315            (mh-press-button)
 316            (message "MIME part already inserted")))
 317     (goto-char point)
 318     (set-buffer-modified-p nil)))
 319
 320 ;;;###mh-autoload
 321 (defun mh-folder-save-mime-part (part-index)
 322   "Save (output) attachment.
 323
 324 This command saves the attachment associated with the button under the
 325 cursor. If the cursor is not located over a button, then the cursor
 326 first moves to the next button, wrapping to the beginning of the
 327 message if necessary.
 328
 329 You can also provide a numeric prefix argument PART-INDEX to save the
 330 attachment labeled with that number.
 331
 332 This command prompts you for a filename and suggests a specific name
 333 if it is available."
 334   (interactive "P")
 335   (when (consp part-index) (setq part-index (car part-index)))
 336   (mh-folder-mime-action part-index #'mh-mime-save-part nil))
 337
 338 (defun mh-mime-save-part ()
 339   "Save MIME part at point."
 340   (interactive)
 341   (let ((data (get-text-property (point) 'mh-data)))
 342     (when data
 343       (let ((mm-default-directory
 344              (file-name-as-directory (or mh-mime-save-parts-directory
 345                                          default-directory))))
 346         (mh-mm-save-part data)
 347         (setq mh-mime-save-parts-directory mm-default-directory)))))
 348
 349 ;;;###mh-autoload
 350 (defun mh-folder-toggle-mime-part (part-index)
 351   "View attachment.
 352
 353 This command displays (or hides) the attachment associated with
 354 the button under the cursor. If the cursor is not located over a
 355 button, then the cursor first moves to the next button, wrapping
 356 to the beginning of the message if necessary. This command has
 357 the advantage over related commands of working from the MH-Folder
 358 buffer.
 359
 360 You can also provide a numeric prefix argument PART-INDEX to view
 361 the attachment labeled with that number. If Emacs does not know
 362 how to display the attachment, then Emacs offers to save the
 363 attachment in a file."
 364   (interactive "P")
 365   (when (consp part-index) (setq part-index (car part-index)))
 366   (mh-folder-mime-action part-index #'mh-press-button t))
 367
 368 ;;;###mh-autoload
 369 (defun mh-mime-save-parts (prompt)
 370   "Save attachments.
 371
 372 You can save all of the attachments at once with this command.
 373 The attachments are saved in the directory specified by the
 374 option `mh-mime-save-parts-default-directory' unless you use a
 375 prefix argument PROMPT in which case you are prompted for the
 376 directory. These directories may be superseded by MH profile
 377 components, since this function calls on \"mhstore\" (\"mhn\") to
 378 do the work."
 379   (interactive "P")
 380   (let ((msg (if (eq major-mode 'mh-show-mode)
 381                  (mh-show-buffer-message-number)
 382                (mh-get-msg-num t)))
 383         (folder (if (eq major-mode 'mh-show-mode)
 384                     mh-show-folder-buffer
 385                   mh-current-folder))
 386         (command (if (mh-variant-p 'nmh) "mhstore" "mhn"))
 387         (directory
 388          (cond
 389           ((and (or prompt
 390                     (equal nil mh-mime-save-parts-default-directory)
 391                     (equal t mh-mime-save-parts-default-directory))
 392                 (not mh-mime-save-parts-directory))
 393            (read-directory-name "Store in directory: " nil nil t))
 394           ((and (or prompt
 395                     (equal t mh-mime-save-parts-default-directory))
 396                 mh-mime-save-parts-directory)
 397            (read-directory-name (format
 398                             "Store in directory (default %s): "
 399                             mh-mime-save-parts-directory)
 400                            "" mh-mime-save-parts-directory t ""))
 401           ((stringp mh-mime-save-parts-default-directory)
 402            mh-mime-save-parts-default-directory)
 403           (t
 404            mh-mime-save-parts-directory))))
 405     (if (and (equal directory "") mh-mime-save-parts-directory)
 406         (setq directory mh-mime-save-parts-directory))
 407     (if (not (file-directory-p directory))
 408         (message "No directory specified")
 409       (if (equal nil mh-mime-save-parts-default-directory)
 410           (setq mh-mime-save-parts-directory directory))
 411       (with-current-buffer (get-buffer-create mh-log-buffer)
 412         (cd directory)
 413         (setq mh-mime-save-parts-directory directory)
 414         (let ((initial-size (mh-truncate-log-buffer)))
 415           (apply 'call-process
 416                  (expand-file-name command mh-progs) nil t nil
 417                  (mh-list-to-string (list folder msg "-auto"
 418                                           (if (not (mh-variant-p 'nmh))
 419                                               "-store"))))
 420           (if (> (buffer-size) initial-size)
 421               (save-window-excursion
 422                 (switch-to-buffer-other-window mh-log-buffer)
 423                 (sit-for 3))))))))
 424
 425 ;;;###mh-autoload
 426 (defun mh-toggle-mh-decode-mime-flag ()
 427   "Toggle the value of `mh-decode-mime-flag'."
 428   (interactive)
 429   (setq mh-decode-mime-flag (not mh-decode-mime-flag))
 430   (mh-show nil t)
 431   (message "%s" (if mh-decode-mime-flag
 432                     "Processing attachments normally"
 433                   "Displaying raw message")))
 434
 435 ;;;###mh-autoload
 436 (defun mh-toggle-mime-buttons ()
 437   "Toggle option `mh-display-buttons-for-inline-parts-flag'."
 438   (interactive)
 439   (setq mh-display-buttons-for-inline-parts-flag
 440         (not mh-display-buttons-for-inline-parts-flag))
 441   (mh-show nil t))
 442
 443 \f
 444
 445 ;;; MIME Display Routines
 446
 447 (defun mh-mm-inline-message (handle)
 448   "Display message, HANDLE.
 449 The function decodes the message and displays it. It avoids
 450 decoding the same message multiple times."
 451   (let ((b (point))
 452         (clean-message-header mh-clean-message-header-flag)
 453         (invisible-headers mh-invisible-header-fields-compiled)
 454         (visible-headers nil))
 455     (save-excursion
 456       (save-restriction
 457         (narrow-to-region b b)
 458         (mm-insert-part handle)
 459         (mh-mime-display
 460          (or (gethash handle (mh-mime-handles-cache (mh-buffer-data)))
 461              (setf (gethash handle (mh-mime-handles-cache (mh-buffer-data)))
 462                    (let ((handles (mm-dissect-buffer nil)))
 463                      (if handles
 464                          (mh-mm-uu-dissect-text-parts handles)
 465                        (setq handles (mm-uu-dissect)))
 466                      (setf (mh-mime-handles (mh-buffer-data))
 467                            (mh-mm-merge-handles
 468                             handles (mh-mime-handles (mh-buffer-data))))
 469                      handles))))
 470
 471         (goto-char (point-min))
 472         (mh-show-xface)
 473         (cond (clean-message-header
 474                (mh-clean-msg-header (point-min)
 475                                     invisible-headers
 476                                     visible-headers)
 477                (goto-char (point-min)))
 478               (t
 479                (mh-start-of-uncleaned-message)))
 480         (mh-decode-message-header)
 481         (mh-show-addr)
 482         ;; The other highlighting types don't need anything special
 483         (when (eq mh-highlight-citation-style 'gnus)
 484           (mh-gnus-article-highlight-citation))
 485         (goto-char (point-min))
 486         (insert "\n------- Forwarded Message\n\n")
 487         (mh-display-smileys)
 488         (mh-display-emphasis)
 489         (mm-handle-set-undisplayer
 490          handle
 491          `(lambda ()
 492             (let (buffer-read-only)
 493               (if (fboundp 'remove-specifier)
 494                   ;; This is only valid on XEmacs.
 495                   (mapcar (lambda (prop)
 496                             (remove-specifier
 497                              (face-property 'default prop) (current-buffer)))
 498                           '(background background-pixmap foreground)))
 499               (delete-region ,(point-min-marker) ,(point-max-marker)))))))))
 500
 501 ;;;###mh-autoload
 502 (defun mh-decode-message-header ()
 503   "Decode RFC2047 encoded message header fields."
 504   (when mh-decode-mime-flag
 505     (let ((buffer-read-only nil))
 506       (rfc2047-decode-region (point-min) (mh-mail-header-end)))))
 507
 508 ;;;###mh-autoload
 509 (defun mh-decode-message-subject ()
 510   "Decode RFC2047 encoded message header fields."
 511   (when mh-decode-mime-flag
 512     (save-excursion
 513       (let ((buffer-read-only nil))
 514         (rfc2047-decode-region (progn (mh-goto-header-field "subject:") (point))
 515                                (progn (mh-header-field-end) (point)))))))
 516
 517 ;;;###mh-autoload
 518 (defun mh-mime-display (&optional pre-dissected-handles)
 519   "Display (and possibly decode) MIME handles.
 520 Optional argument, PRE-DISSECTED-HANDLES is a list of MIME
 521 handles. If present they are displayed otherwise the buffer is
 522 parsed and then displayed."
 523   (let ((handles ())
 524         (folder mh-show-folder-buffer)
 525         (raw-message-data (buffer-string)))
 526     (flet ((mm-handle-set-external-undisplayer
 527             (handle function)
 528             (mh-handle-set-external-undisplayer folder handle function)))
 529       (goto-char (point-min))
 530       (unless (search-forward "\n\n" nil t)
 531         (goto-char (point-max))
 532         (insert "\n\n"))
 533
 534       (condition-case err
 535           (progn
 536             ;; If needed dissect the current buffer
 537             (if pre-dissected-handles
 538                 (setq handles pre-dissected-handles)
 539               (if (setq handles (mm-dissect-buffer nil))
 540                   (mh-mm-uu-dissect-text-parts handles)
 541                 (setq handles (mm-uu-dissect)))
 542               (setf (mh-mime-handles (mh-buffer-data))
 543                     (mh-mm-merge-handles handles
 544                                          (mh-mime-handles (mh-buffer-data))))
 545               (unless handles
 546                 (mh-decode-message-body)))
 547
 548             (cond ((and handles
 549                         (or (not (stringp (car handles)))
 550                             (cdr handles)))
 551                    ;; Go to start of message body
 552                    (goto-char (point-min))
 553                    (or (search-forward "\n\n" nil t)
 554                        (goto-char (point-max)))
 555
 556                    ;; Delete the body
 557                    (delete-region (point) (point-max))
 558
 559                    ;; Display the MIME handles
 560                    (mh-mime-display-part handles))
 561                   (t
 562                    (mh-signature-highlight))))
 563         (error
 564          (message "Could not display body: %s" (error-message-string err))
 565          (delete-region (point-min) (point-max))
 566          (insert raw-message-data))))))
 567
 568 (defun mh-decode-message-body ()
 569   "Decode message based on charset.
 570 If message has been encoded for transfer take that into account."
 571   (let (ct charset cte)
 572     (goto-char (point-min))
 573     (re-search-forward "\n\n" nil t)
 574     (save-restriction
 575       (narrow-to-region (point-min) (point))
 576       (setq ct (ignore-errors (mail-header-parse-content-type
 577                                (message-fetch-field "Content-Type" t)))
 578             charset (mail-content-type-get ct 'charset)
 579             cte (message-fetch-field "Content-Transfer-Encoding")))
 580     (when (stringp cte) (setq cte (mail-header-strip cte)))
 581     (when (or (not ct) (equal (car ct) "text/plain"))
 582       (save-restriction
 583         (narrow-to-region (min (1+ (mh-mail-header-end)) (point-max))
 584                           (point-max))
 585         (mm-decode-body charset
 586                         (and cte (intern (downcase
 587                                           (gnus-strip-whitespace cte))))
 588                         (car ct))))))
 589
 590 (defun mh-mime-display-part (handle)
 591   "Decides the viewer to call based on the type of HANDLE."
 592   (cond ((null handle)
 593          nil)
 594         ((not (stringp (car handle)))
 595          (mh-mime-display-single handle))
 596         ((equal (car handle) "multipart/alternative")
 597          (mh-mime-display-alternative (cdr handle)))
 598         ((and mh-pgp-support-flag
 599               (or (equal (car handle) "multipart/signed")
 600                   (equal (car handle) "multipart/encrypted")))
 601          (mh-mime-display-security handle))
 602         (t
 603          (mh-mime-display-mixed (cdr handle)))))
 604
 605 (defun mh-mime-display-mixed (handles)
 606   "Display the list of MIME parts, HANDLES recursively."
 607   (mapcar #'mh-mime-display-part handles))
 608
 609 (defun mh-mime-display-alternative (handles)
 610   "Choose among the alternatives, HANDLES the part that will be displayed.
 611 If no part is preferred then all the parts are displayed."
 612   (let* ((preferred (mm-preferred-alternative handles))
 613          (others (loop for x in handles unless (eq x preferred) collect x)))
 614     (cond ((and preferred
 615                 (stringp (car preferred)))
 616            (mh-mime-display-part preferred)
 617            (mh-mime-maybe-display-alternatives others))
 618           (preferred
 619            (save-restriction
 620              (narrow-to-region (point) (if (eobp) (point) (1+ (point))))
 621              (mh-mime-display-single preferred)
 622              (mh-mime-maybe-display-alternatives others)
 623              (goto-char (point-max))))
 624           (t
 625            (mh-mime-display-mixed handles)))))
 626
 627 (defun mh-mime-maybe-display-alternatives (alternatives)
 628   "Show buttons for ALTERNATIVES.
 629 If `mh-mime-display-alternatives-flag' is non-nil then display
 630 buttons for alternative parts that are usually suppressed."
 631   (when (and mh-display-buttons-for-alternatives-flag alternatives)
 632     (insert "\n----------------------------------------------------\n")
 633     (insert "Alternatives:\n")
 634     (dolist (x alternatives)
 635       (insert "\n")
 636       (mh-insert-mime-button x (mh-mime-part-index x) nil))
 637     (insert "\n----------------------------------------------------\n")))
 638
 639 (defun mh-mime-display-security (handle)
 640   "Display PGP encrypted/signed message, HANDLE."
 641   (save-restriction
 642     (narrow-to-region (point) (point))
 643     (insert "\n")
 644     (mh-insert-mime-security-button handle)
 645     (mh-mime-display-mixed (cdr handle))
 646     (insert "\n")
 647     (let ((mh-mime-security-button-line-format
 648            mh-mime-security-button-end-line-format))
 649       (mh-insert-mime-security-button handle))
 650     (mh-mm-set-handle-multipart-parameter
 651      handle 'mh-region (cons (point-min-marker) (point-max-marker)))))
 652
 653 (defun mh-mime-display-single (handle)
 654   "Display a leaf node, HANDLE in the MIME tree."
 655   (let* ((type (mm-handle-media-type handle))
 656          (small-image-flag (mh-small-image-p handle))
 657          (attachmentp (equal (car (mm-handle-disposition handle))
 658                              "attachment"))
 659          (inlinep (and (equal (car (mm-handle-disposition handle)) "inline")
 660                        (mm-inlinable-p handle)
 661                        (mm-inlined-p handle)))
 662          (displayp (or inlinep                   ; show if inline OR
 663                        (mh-inline-vcard-p handle);      inline vcard OR
 664                        (and (not attachmentp)    ;      if not an attachment
 665                             (or small-image-flag ;        and small image
 666                                                  ;        and user wants inline
 667                                 (and (not (equal
 668                                            (mm-handle-media-supertype handle)
 669                                            "image"))
 670                                      (mm-inlinable-p handle)
 671                                      (mm-inlined-p handle)))))))
 672     (save-restriction
 673       (narrow-to-region (point) (if (eobp) (point) (1+ (point))))
 674       (cond ((and mh-pgp-support-flag
 675                   (equal type "application/pgp-signature"))
 676              nil)             ; skip signatures as they are already handled...
 677             ((not displayp)
 678              (insert "\n")
 679              (mh-insert-mime-button handle (mh-mime-part-index handle) nil))
 680             ((and displayp
 681                   (not mh-display-buttons-for-inline-parts-flag))
 682              (or (mm-display-part handle)
 683                  (mm-display-part handle))
 684              (mh-signature-highlight handle))
 685             ((and displayp
 686                   mh-display-buttons-for-inline-parts-flag)
 687              (insert "\n")
 688              (mh-insert-mime-button handle (mh-mime-part-index handle) nil)
 689              (forward-line -1)
 690              (mh-mm-display-part handle)))
 691       (goto-char (point-max)))))
 692
 693 ;; There is a bug in Gnus inline image display due to which an extra line
 694 ;; gets inserted every time it is viewed. To work around that problem we are
 695 ;; using an extra property 'mh-region to remember the region that is added
 696 ;; when the button is clicked. The region is then deleted to make sure that
 697 ;; no extra lines get inserted.
 698 (defun mh-mm-display-part (handle)
 699   "Toggle display of button for MIME part, HANDLE."
 700   (beginning-of-line)
 701   (let ((id (get-text-property (point) 'mh-part))
 702         (point (point))
 703         (window (selected-window))
 704         (mail-parse-charset 'nil)
 705         (mail-parse-ignored-charsets nil)
 706         region buffer-read-only)
 707     (save-excursion
 708       (unwind-protect
 709           (let ((win (get-buffer-window (current-buffer) t)))
 710             (when win
 711               (select-window win))
 712             (goto-char point)
 713
 714             (if (mm-handle-displayed-p handle)
 715                 ;; This will remove the part.
 716                 (progn
 717                   ;; Delete the button and displayed part (if any)
 718                   (let ((region (get-text-property point 'mh-region)))
 719                     (when region
 720                       (mh-funcall-if-exists
 721                        remove-images (car region) (cdr region)))
 722                     (mm-display-part handle)
 723                     (when region
 724                       (delete-region (car region) (cdr region))))
 725                   ;; Delete button (if it still remains). This happens for
 726                   ;; externally displayed parts where the previous step does
 727                   ;; nothing.
 728                   (unless (eolp)
 729                     (delete-region (point) (progn (forward-line) (point)))))
 730               (save-restriction
 731                 (delete-region (point) (progn (forward-line 1) (point)))
 732                 (narrow-to-region (point) (point))
 733                 ;; Maybe we need another unwind-protect here.
 734                 (when (equal (mm-handle-media-supertype handle) "image")
 735                   (insert "\n"))
 736                 (when (and (not (eq (ignore-errors (mm-display-part handle))
 737                                     'inline))
 738                            (equal (mm-handle-media-supertype handle)
 739                                   "image"))
 740                   (goto-char (point-min))
 741                   (delete-char 1))
 742                 (when (equal (mm-handle-media-supertype handle) "text")
 743                   (when (eq mh-highlight-citation-style 'gnus)
 744                     (mh-gnus-article-highlight-citation))
 745                   (mh-display-smileys)
 746                   (mh-display-emphasis)
 747                   (mh-signature-highlight handle))
 748                 (setq region (cons (progn (goto-char (point-min))
 749                                           (point-marker))
 750                                    (progn (goto-char (point-max))
 751                                           (point-marker)))))))
 752         (when (window-live-p window)
 753           (select-window window))
 754         (goto-char point)
 755         (beginning-of-line)
 756         (mh-insert-mime-button handle id (mm-handle-displayed-p handle))
 757         (goto-char point)
 758         (when region
 759           (add-text-properties (mh-line-beginning-position)
 760                                (mh-line-end-position)
 761                                `(mh-region ,region)))))))
 762
 763 (defun mh-mime-part-index (handle)
 764   "Generate the button number for MIME part, HANDLE.
 765 Notice that a hash table is used to display the same number when
 766 buttons need to be displayed multiple times (for instance when
 767 nested messages are opened)."
 768   (or (gethash handle (mh-mime-part-index-hash (mh-buffer-data)))
 769       (setf (gethash handle (mh-mime-part-index-hash (mh-buffer-data)))
 770             (incf (mh-mime-parts-count (mh-buffer-data))))))
 771
 772 (defun mh-small-image-p (handle)
 773   "Decide whether HANDLE is a \"small\" image that can be displayed inline.
 774 This is only useful if a Content-Disposition header is not present."
 775   (let ((media-test (caddr (assoc (car (mm-handle-type handle))
 776                                   mh-mm-inline-media-tests)))
 777         (mm-inline-large-images t))
 778     (and media-test
 779          (equal (mm-handle-media-supertype handle) "image")
 780          (funcall media-test handle) ; Since mm-inline-large-images is T,
 781                                         ; this only tells us if the image is
 782                                         ; something that emacs can display
 783          (let* ((image (mm-get-image handle)))
 784            (or (mh-do-in-xemacs
 785                  (and (mh-funcall-if-exists glyphp image)
 786                       (< (glyph-width image)
 787                          (or mh-max-inline-image-width (window-pixel-width)))
 788                       (< (glyph-height image)
 789                          (or mh-max-inline-image-height
 790                              (window-pixel-height)))))
 791                (mh-do-in-gnu-emacs
 792                  (let ((size (mh-funcall-if-exists image-size image)))
 793                    (and size
 794                         (< (cdr size) (or mh-max-inline-image-height
 795                                           (1- (window-height))))
 796                         (< (car size) (or mh-max-inline-image-width
 797                                           (window-width)))))))))))
 798
 799 (defun mh-inline-vcard-p (handle)
 800   "Decide if HANDLE is a vcard that must be displayed inline."
 801   (let ((type (mm-handle-type handle)))
 802     (and (or (featurep 'vcard) (fboundp 'vcard-pretty-print))
 803          (consp type)
 804          (equal (car type) "text/x-vcard")
 805          (save-excursion
 806            (save-restriction
 807              (widen)
 808              (goto-char (point-min))
 809              (not (mh-signature-separator-p)))))))
 810
 811 (defun mh-signature-highlight (&optional handle)
 812   "Highlight message signature in HANDLE.
 813 The optional argument, HANDLE is a MIME handle if the function is
 814 being used to highlight the signature in a MIME part."
 815   (let ((regexp
 816          (cond ((not handle) "^-- $")
 817                ((not (and (equal (mm-handle-media-supertype handle) "text")
 818                           (equal (mm-handle-media-subtype handle) "html")))
 819                 "^-- $")
 820                ((eq (mh-mm-text-html-renderer) 'lynx) "^   --$")
 821                (t "^--$"))))
 822     (save-excursion
 823       (goto-char (point-max))
 824       (when (re-search-backward regexp nil t)
 825         (mh-do-in-gnu-emacs
 826           (let ((ov (make-overlay (point) (point-max))))
 827             (overlay-put ov 'face 'mh-show-signature)
 828             (overlay-put ov 'evaporate t)))
 829         (mh-do-in-xemacs
 830           (set-extent-property (make-extent (point) (point-max))
 831                                'face 'mh-show-signature))))))
 832
 833 \f
 834
 835 ;;; Button Display
 836
 837 ;; Shush compiler.
 838 (when (featurep 'xemacs)
 839   (defvar dots)
 840   (defvar type)
 841   (defvar ov))
 842
 843 (defun mh-insert-mime-button (handle index displayed)
 844   "Insert MIME button for HANDLE.
 845 INDEX is the part number that will be DISPLAYED. It is also used
 846 by commands like \"K v\" which operate on individual MIME parts."
 847   ;; The button could be displayed by a previous decode. In that case
 848   ;; undisplay it if we need a hidden button.
 849   (when (and (mm-handle-displayed-p handle) (not displayed))
 850     (mm-display-part handle))
 851   (let ((name (or (mail-content-type-get (mm-handle-type handle) 'name)
 852                   (mail-content-type-get (mm-handle-disposition handle)
 853                                          'filename)
 854                   (mail-content-type-get (mm-handle-type handle) 'url)
 855                   ""))
 856         (type (mm-handle-media-type handle))
 857         (description (mail-decode-encoded-word-string
 858                       (or (mm-handle-description handle) "")))
 859         (dots (if (or displayed (mm-handle-displayed-p handle)) "   " "..."))
 860         long-type begin end)
 861     (if (string-match ".*/" name) (setq name (substring name (match-end 0))))
 862     (setq long-type (concat type (and (not (equal name ""))
 863                                       (concat "; " name))))
 864     (unless (equal description "")
 865       (setq long-type (concat " --- " long-type)))
 866     (unless (bolp) (insert "\n"))
 867     (setq begin (point))
 868     (gnus-eval-format
 869      mh-mime-button-line-format mh-mime-button-line-format-alist
 870      `(,@(mh-gnus-local-map-property mh-mime-button-map)
 871          mh-callback mh-mm-display-part
 872          mh-part ,index
 873          mh-data ,handle))
 874     (setq end (point))
 875     (widget-convert-button
 876      'link begin end
 877      :mime-handle handle
 878      :action 'mh-widget-press-button
 879      :button-keymap mh-mime-button-map
 880      :help-echo
 881      "Mouse-2 click or press RET (in show buffer) to toggle display")
 882     (dolist (ov (mh-funcall-if-exists overlays-in begin end))
 883       (mh-funcall-if-exists overlay-put ov 'evaporate t))))
 884
 885 ;; Shush compiler.
 886 (defvar mm-verify-function-alist)       ; < Emacs 22
 887 (defvar mm-decrypt-function-alist)      ; < Emacs 22
 888 (defvar pressed-details)                ; XEmacs
 889
 890 (defun mh-insert-mime-security-button (handle)
 891   "Display buttons for PGP message, HANDLE."
 892   (let* ((protocol (mh-mm-handle-multipart-ctl-parameter handle 'protocol))
 893          (crypto-type (or (nth 2 (assoc protocol mm-verify-function-alist))
 894                           (nth 2 (assoc protocol mm-decrypt-function-alist))
 895                           "Unknown"))
 896          (type (concat crypto-type
 897                        (if (equal (car handle) "multipart/signed")
 898                            " Signed" " Encrypted")
 899                        " Part"))
 900          (info (or (mh-mm-handle-multipart-ctl-parameter handle 'gnus-info)
 901                    "Undecided"))
 902          (details (mh-mm-handle-multipart-ctl-parameter handle 'gnus-details))
 903          pressed-details begin end face)
 904     (setq details (if details (concat "\n" details) ""))
 905     (setq pressed-details (if mh-mime-security-button-pressed details ""))
 906     (setq face (mh-mime-security-button-face info))
 907     (unless (bolp) (insert "\n"))
 908     (setq begin (point))
 909     (gnus-eval-format
 910      mh-mime-security-button-line-format
 911      mh-mime-security-button-line-format-alist
 912      `(,@(mh-gnus-local-map-property mh-mime-security-button-map)
 913          mh-button-pressed ,mh-mime-security-button-pressed
 914          mh-callback mh-mime-security-press-button
 915          mh-line-format ,mh-mime-security-button-line-format
 916          mh-data ,handle))
 917     (setq end (point))
 918     (widget-convert-button 'link begin end
 919                            :mime-handle handle
 920                            :action 'mh-widget-press-button
 921                            :button-keymap mh-mime-security-button-map
 922                            :button-face face
 923                            :help-echo "Mouse-2 click or press RET (in show buffer) to see security details.")
 924     (dolist (ov (mh-funcall-if-exists overlays-in begin end))
 925       (mh-funcall-if-exists overlay-put ov 'evaporate t))
 926     (when (equal info "Failed")
 927       (let* ((type (if (equal (car handle) "multipart/signed")
 928                        "verification" "decryption"))
 929              (warning (if (equal type "decryption")
 930                           "(passphrase may be incorrect)" "")))
 931         (message "%s %s failed %s" crypto-type type warning)))))
 932
 933 (defun mh-mime-security-button-face (info)
 934   "Return the button face to use for encrypted/signed mail based on INFO."
 935   (cond ((string-match "OK" info)       ;Decrypted mail
 936          'mh-show-pgg-good)
 937         ((string-match "Failed" info)   ;Decryption failed or signature invalid
 938          'mh-show-pgg-bad)
 939         ((string-match "Undecided" info);Unprocessed mail
 940          'mh-show-pgg-unknown)
 941         ((string-match "Untrusted" info);Key not trusted
 942          'mh-show-pgg-unknown)
 943         (t
 944          'mh-show-pgg-good)))
 945
 946 \f
 947
 948 ;;; Button Handlers
 949
 950 (defun mh-folder-mime-action (part-index action include-security-flag)
 951   "Go to PART-INDEX and carry out ACTION.
 952
 953 If PART-INDEX is nil then go to the next part in the buffer. The
 954 search for the next buffer wraps around if end of buffer is reached.
 955 If argument INCLUDE-SECURITY-FLAG is non-nil then include security
 956 info buttons when searching for a suitable parts."
 957   (unless mh-showing-mode
 958     (mh-show))
 959   (mh-in-show-buffer (mh-show-buffer)
 960     (let ((criterion
 961            (cond (part-index
 962                   (lambda (p)
 963                     (let ((part (get-text-property p 'mh-part)))
 964                       (and (integerp part) (= part part-index)))))
 965                  (t (lambda (p)
 966                       (if include-security-flag
 967                           (get-text-property p 'mh-data)
 968                         (integerp (get-text-property p 'mh-part)))))))
 969           (point (point)))
 970       (cond ((and (get-text-property point 'mh-part)
 971                   (or (null part-index)
 972                       (= (get-text-property point 'mh-part) part-index)))
 973              (funcall action))
 974             ((and (get-text-property point 'mh-data)
 975                   include-security-flag
 976                   (null part-index))
 977              (funcall action))
 978             (t
 979              (mh-goto-next-button nil criterion)
 980              (if (= (point) point)
 981                  (message "No matching MIME part found")
 982                (funcall action)))))))
 983
 984 ;;;###mh-autoload
 985 (defun mh-goto-next-button (backward-flag &optional criterion)
 986   "Search for next button satisfying criterion.
 987
 988 If BACKWARD-FLAG is non-nil search backward in the buffer for a mime
 989 button.
 990 If CRITERION is a function or a symbol which has a function binding
 991 then that function must return non-nil at the button we stop."
 992   (unless (or (and (symbolp criterion) (fboundp criterion))
 993               (functionp criterion))
 994     (setq criterion (lambda (x) t)))
 995   ;; Move to the next button in the buffer satisfying criterion
 996   (goto-char (or (save-excursion
 997                    (beginning-of-line)
 998                    ;; Find point before current button
 999                    (let ((point-before-current-button
1000                           (save-excursion
1001                             (while (get-text-property (point) 'mh-data)
1002                               (unless (= (forward-line
1003                                           (if backward-flag 1 -1))
1004                                          0)
1005                                 (if backward-flag
1006                                     (goto-char (point-min))
1007                                   (goto-char (point-max)))))
1008                             (point))))
1009                      ;; Skip over current button
1010                      (while (and (get-text-property (point) 'mh-data)
1011                                  (not (if backward-flag (bobp) (eobp))))
1012                        (forward-line (if backward-flag -1 1)))
1013                      ;; Stop at next MIME button if any exists.
1014                      (block loop
1015                        (while (/= (progn
1016                                     (unless (= (forward-line
1017                                                 (if backward-flag -1 1))
1018                                                0)
1019                                       (if backward-flag
1020                                           (goto-char (point-max))
1021                                         (goto-char (point-min)))
1022                                       (beginning-of-line))
1023                                     (point))
1024                                   point-before-current-button)
1025                          (when (and (get-text-property (point) 'mh-data)
1026                                     (funcall criterion (point)))
1027                            (return-from loop (point))))
1028                        nil)))
1029                  (point))))
1030
1031 (defun mh-widget-press-button (widget el)
1032   "Callback for widget, WIDGET.
1033 Parameter EL is unused."
1034   (goto-char (widget-get widget :from))
1035   (mh-press-button))
1036
1037 (defun mh-press-button ()
1038   "View contents of button.
1039
1040 This command is a toggle so if you use it again on the same
1041 attachment, the attachment is hidden."
1042   (interactive)
1043   (let ((mm-inline-media-tests mh-mm-inline-media-tests)
1044         (data (get-text-property (point) 'mh-data))
1045         (function (get-text-property (point) 'mh-callback))
1046         (buffer-read-only nil)
1047         (folder mh-show-folder-buffer))
1048     (flet ((mm-handle-set-external-undisplayer
1049             (handle function)
1050             (mh-handle-set-external-undisplayer folder handle function)))
1051       (when (and function (eolp))
1052         (backward-char))
1053       (unwind-protect (and function (funcall function data))
1054         (set-buffer-modified-p nil)))))
1055
1056 (defun mh-push-button (event)
1057   "Click MIME button for EVENT.
1058
1059 If the MIME part is visible then it is removed. Otherwise the
1060 part is displayed. This function is called when the mouse is used
1061 to click the MIME button."
1062   (interactive "e")
1063   (mh-do-at-event-location event
1064     (let ((folder mh-show-folder-buffer)
1065           (mm-inline-media-tests mh-mm-inline-media-tests)
1066           (data (get-text-property (point) 'mh-data))
1067           (function (get-text-property (point) 'mh-callback)))
1068       (flet ((mm-handle-set-external-undisplayer (handle func)
1069                (mh-handle-set-external-undisplayer folder handle func)))
1070         (and function (funcall function data))))))
1071
1072 (defun mh-handle-set-external-undisplayer (folder handle function)
1073   "Replacement for `mm-handle-set-external-undisplayer'.
1074
1075 This is only called in recent versions of Gnus. The MIME handles
1076 are stored in data structures corresponding to MH-E folder buffer
1077 FOLDER instead of in Gnus (as in the original). The MIME part,
1078 HANDLE is associated with the undisplayer FUNCTION."
1079   (if (mh-mm-keep-viewer-alive-p handle)
1080       (let ((new-handle (copy-sequence handle)))
1081         (mm-handle-set-undisplayer new-handle function)
1082         (mm-handle-set-undisplayer handle nil)
1083         (with-current-buffer folder
1084           (push new-handle (mh-mime-handles (mh-buffer-data)))))
1085     (mm-handle-set-undisplayer handle function)))
1086
1087 (defun mh-mime-security-press-button (handle)
1088   "Callback from security button for part HANDLE."
1089   (if (mh-mm-handle-multipart-ctl-parameter handle 'gnus-info)
1090       (mh-mime-security-show-details handle)
1091     (let ((region (mh-mm-handle-multipart-ctl-parameter handle 'mh-region))
1092           point)
1093       (setq point (point))
1094       (goto-char (car region))
1095       (delete-region (car region) (cdr region))
1096       (with-current-buffer (mh-mm-handle-multipart-ctl-parameter handle 'buffer)
1097         (let* ((mm-verify-option 'known)
1098                (mm-decrypt-option 'known)
1099                (new (mh-mm-possibly-verify-or-decrypt (cdr handle) handle)))
1100           (unless (eq new (cdr handle))
1101             (mh-mm-destroy-parts (cdr handle))
1102             (setcdr handle new))))
1103       (mh-mime-display-security handle)
1104       (goto-char point))))
1105
1106 ;; I rewrote the security part because Gnus doesn't seem to ever minimize
1107 ;; the button. That is once the mime-security button is pressed there seems
1108 ;; to be no way of getting rid of the inserted text.
1109 (defun mh-mime-security-show-details (handle)
1110   "Toggle display of detailed security info for HANDLE."
1111   (let ((details (mh-mm-handle-multipart-ctl-parameter handle 'gnus-details)))
1112     (when details
1113       (let ((mh-mime-security-button-pressed
1114              (not (get-text-property (point) 'mh-button-pressed)))
1115             (mh-mime-security-button-line-format
1116              (get-text-property (point) 'mh-line-format)))
1117         (forward-char -1)
1118         (while (eq (get-text-property (point) 'mh-line-format)
1119                    mh-mime-security-button-line-format)
1120           (forward-char -1))
1121         (forward-char)
1122         (save-restriction
1123           (narrow-to-region (point) (point))
1124           (mh-insert-mime-security-button handle))
1125         (delete-region
1126          (point)
1127          (or (text-property-not-all
1128               (point) (point-max)
1129               'mh-line-format mh-mime-security-button-line-format)
1130              (point-max)))
1131         (forward-line -1)))))
1132
1133 \f
1134
1135 ;;; Miscellaneous Article Washing
1136
1137 ;;;###mh-autoload
1138 (defun mh-add-missing-mime-version-header ()
1139   "Some mail programs don't put a MIME-Version header.
1140 I have seen this only in spam, so maybe we shouldn't fix
1141 this ;-)"
1142   (save-excursion
1143     (goto-char (point-min))
1144     (re-search-forward "\n\n" nil t)
1145     (save-restriction
1146       (narrow-to-region (point-min) (point))
1147       (when (and (message-fetch-field "content-type")
1148                  (not (message-fetch-field "mime-version")))
1149         (goto-char (point-min))
1150         (insert "MIME-Version: 1.0\n")))))
1151
1152 ;;;###mh-autoload
1153 (defun mh-display-smileys ()
1154   "Display smileys."
1155   (when (and mh-graphical-smileys-flag (mh-small-show-buffer-p))
1156     (mh-funcall-if-exists smiley-region (point-min) (point-max))))
1157
1158 ;;;###mh-autoload
1159 (defun mh-display-emphasis ()
1160   "Display graphical emphasis."
1161   (when (and mh-graphical-emphasis-flag (mh-small-show-buffer-p))
1162     (flet ((article-goto-body ()))      ; shadow this function to do nothing
1163       (save-excursion
1164         (goto-char (point-min))
1165         (article-emphasize)))))
1166
1167 (defun mh-small-show-buffer-p ()
1168   "Check if show buffer is small.
1169 This is used to decide if smileys and graphical emphasis should be
1170 displayed."
1171   (let ((max nil))
1172     (when (and (boundp 'font-lock-maximum-size) font-lock-maximum-size)
1173       (cond ((numberp font-lock-maximum-size)
1174              (setq max font-lock-maximum-size))
1175             ((listp font-lock-maximum-size)
1176              (setq max (cdr (or (assoc 'mh-show-mode font-lock-maximum-size)
1177                                 (assoc t font-lock-maximum-size)))))))
1178     (or (not (numberp max)) (>= (/ max 8) (buffer-size)))))
1179
1180 \f
1181
1182 ;;; MH-Letter Commands
1183
1184 ;; MH-E commands are alphabetical; specific support routines follow command.
1185
1186 ;;;###mh-autoload
1187 (defun mh-compose-forward (&optional description folder range)
1188   "Add tag to forward a message.
1189
1190 You are prompted for a content DESCRIPTION, the name of the
1191 FOLDER in which the messages to forward are located, and a RANGE
1192 of messages, which defaults to the current message in that
1193 folder. Check the documentation of `mh-interactive-range' to see
1194 how RANGE is read in interactive use.
1195
1196 The option `mh-compose-insertion' controls what type of tags are inserted."
1197   (interactive
1198    (let* ((description
1199            (mml-minibuffer-read-description))
1200           (folder
1201            (mh-prompt-for-folder "Message from"
1202                                  mh-sent-from-folder nil))
1203           (default
1204             (if (and (equal folder mh-sent-from-folder)
1205                      (numberp mh-sent-from-msg))
1206                 mh-sent-from-msg
1207               (nth 0 (mh-translate-range folder "cur"))))
1208           (range
1209            (mh-read-range "Forward" folder
1210                           (or (and default
1211                                    (number-to-string default))
1212                               t)
1213                           t t)))
1214      (list description folder range)))
1215   (let ((messages (mapconcat 'identity (mh-list-to-string range) " ")))
1216     (dolist (message (mh-translate-range folder messages))
1217       (if (equal mh-compose-insertion 'mml)
1218           (mh-mml-forward-message description folder (format "%s" message))
1219         (mh-mh-forward-message description folder (format "%s" message))))))
1220
1221 ;;;###mh-autoload
1222 (defun mh-mml-forward-message (description folder message)
1223   "Forward a message as attachment.
1224
1225 The function will prompt the user for a DESCRIPTION, a FOLDER and
1226 MESSAGE number."
1227   (let ((msg (if (and (equal message "") (numberp mh-sent-from-msg))
1228                  mh-sent-from-msg
1229                (string-to-number message))))
1230     (cond ((integerp msg)
1231            (mml-attach-file (format "%s%s/%d"
1232                                     mh-user-path (substring folder 1) msg)
1233                             "message/rfc822"
1234                             (if (string= "" description) nil description)
1235                             "inline"))
1236           (t (error "The message number, %s, is not a integer" msg)))))
1237
1238 (defun mh-mh-forward-message (&optional description folder messages)
1239   "Add tag to forward a message.
1240 You are prompted for a content DESCRIPTION, the name of the
1241 FOLDER in which the messages to forward are located, and the
1242 MESSAGES' numbers.
1243
1244 See also \\[mh-mh-to-mime]."
1245   (interactive (list
1246                 (mml-minibuffer-read-description)
1247                 (mh-prompt-for-folder "Message from" mh-sent-from-folder nil)
1248                 (read-string (concat "Messages"
1249                                      (if (numberp mh-sent-from-msg)
1250                                          (format " (default %d): "
1251                                                  mh-sent-from-msg)
1252                                        ": ")))))
1253   (beginning-of-line)
1254   (insert "#forw [")
1255   (and description
1256        (not (string= description ""))
1257        (insert description))
1258   (insert "]")
1259   (and folder
1260        (not (string= folder ""))
1261        (insert " " folder))
1262   (if (and messages
1263            (not (string= messages "")))
1264       (let ((start (point)))
1265         (insert " " messages)
1266         (subst-char-in-region start (point) ?, ? ))
1267     (if (numberp mh-sent-from-msg)
1268         (insert " " (int-to-string mh-sent-from-msg))))
1269   (insert "\n"))
1270
1271 ;;;###mh-autoload
1272 (defun mh-compose-insertion (&optional inline)
1273   "Add tag to include a file such as an image or sound.
1274
1275 You are prompted for the filename containing the object, the
1276 media type if it cannot be determined automatically, and a
1277 content description. If you're using MH-style directives, you
1278 will also be prompted for additional attributes.
1279
1280 The option `mh-compose-insertion' controls what type of tags are
1281 inserted. Optional argument INLINE means make it an inline
1282 attachment."
1283   (interactive "P")
1284   (if (equal mh-compose-insertion 'mml)
1285       (if inline
1286           (mh-mml-attach-file "inline")
1287         (mh-mml-attach-file))
1288     (call-interactively 'mh-mh-attach-file)))
1289
1290 (defun mh-mml-attach-file (&optional disposition)
1291   "Add a tag to insert a MIME message part from a file.
1292
1293 You are prompted for the filename containing the object, the
1294 media type if it cannot be determined automatically, a content
1295 description and the DISPOSITION of the attachment.
1296
1297 This is basically `mml-attach-file' from Gnus, modified such that a prefix
1298 argument yields an \"inline\" disposition and Content-Type is determined
1299 automatically."
1300   (let* ((file (mml-minibuffer-read-file "Attach file: "))
1301          (type (mh-minibuffer-read-type file))
1302          (description (mml-minibuffer-read-description))
1303          (dispos (or disposition
1304                      (mh-mml-minibuffer-read-disposition type))))
1305     (mml-insert-empty-tag 'part 'type type 'filename file
1306                           'disposition dispos 'description description)))
1307
1308 (defun mh-mh-attach-file (filename type description attributes)
1309   "Add a tag to insert a MIME message part from a file.
1310 You are prompted for the FILENAME containing the object, the
1311 media TYPE if it cannot be determined automatically, and a
1312 content DESCRIPTION. In addition, you are also prompted for
1313 additional ATTRIBUTES.
1314
1315 See also \\[mh-mh-to-mime]."
1316   (interactive (let ((filename (mml-minibuffer-read-file "Attach file: ")))
1317                  (list
1318                   filename
1319                   (mh-minibuffer-read-type filename)
1320                   (mml-minibuffer-read-description)
1321                   (read-string "Attributes: "
1322                                (concat "name=\""
1323                                        (file-name-nondirectory filename)
1324                                        "\"")))))
1325   (mh-mh-compose-type filename type description attributes))
1326
1327 (defun mh-mh-compose-type (filename type
1328                                      &optional description attributes comment)
1329   "Insert an MH-style directive to insert a file.
1330 The file specified by FILENAME is encoded as TYPE. An optional
1331 DESCRIPTION is used as the Content-Description field, optional
1332 set of ATTRIBUTES and an optional COMMENT can also be included."
1333   (beginning-of-line)
1334   (insert "#" type)
1335   (and attributes
1336        (insert "; " attributes))
1337   (and comment
1338        (insert " (" comment ")"))
1339   (insert " [")
1340   (and description
1341        (insert description))
1342   (insert "] " (expand-file-name filename))
1343   (insert "\n"))
1344
1345 ;;;###mh-autoload
1346 (defun mh-mh-compose-anon-ftp (host filename type description)
1347   "Add tag to include anonymous ftp reference to a file.
1348
1349 You can have your message initiate an \"ftp\" transfer when the
1350 recipient reads the message. You are prompted for the remote HOST
1351 and FILENAME, the media TYPE, and the content DESCRIPTION.
1352
1353 See also \\[mh-mh-to-mime]."
1354   (interactive (list
1355                 (read-string "Remote host: ")
1356                 (read-string "Remote filename: ")
1357                 (mh-minibuffer-read-type "DUMMY-FILENAME")
1358                 (mml-minibuffer-read-description)))
1359   (mh-mh-compose-external-type "anon-ftp" host filename
1360                                type description))
1361
1362 ;;;###mh-autoload
1363 (defun mh-mh-compose-external-compressed-tar (host filename description)
1364   "Add tag to include anonymous ftp reference to a compressed tar file.
1365
1366 In addition to retrieving the file via anonymous \"ftp\" as per
1367 the command \\[mh-mh-compose-anon-ftp], the file will also be
1368 uncompressed and untarred. You are prompted for the remote HOST
1369 and FILENAME and the content DESCRIPTION.
1370
1371 See also \\[mh-mh-to-mime]."
1372   (interactive (list
1373                 (read-string "Remote host: ")
1374                 (read-string "Remote filename: ")
1375                 (mml-minibuffer-read-description)))
1376   (mh-mh-compose-external-type "anon-ftp" host filename
1377                                "application/octet-stream"
1378                                description
1379                                "type=tar; conversions=x-compress"
1380                                "mode=image"))
1381
1382 ;; RFC 2045 - Multipurpose Internet Mail Extensions (MIME) Part One:
1383 ;;            Format of Internet Message Bodies.
1384 ;; RFC 2046 - Multipurpose Internet Mail Extensions (MIME) Part Two:
1385 ;;            Media Types.
1386 ;; RFC 2049 - Multipurpose Internet Mail Extensions (MIME) Part Five:
1387 ;;            Conformance Criteria and Examples.
1388 ;; RFC 2017 - Definition of the URL MIME External-Body Access-Type
1389 ;; RFC 1738 - Uniform Resource Locators (URL)
1390 (defvar mh-access-types
1391   '(("anon-ftp")        ; RFC2046 Anonymous File Transfer Protocol
1392     ("file")            ; RFC1738 Host-specific file names
1393     ("ftp")             ; RFC2046 File Transfer Protocol
1394     ("gopher")          ; RFC1738 The Gopher Protocol
1395     ("http")            ; RFC1738 Hypertext Transfer Protocol
1396     ("local-file")      ; RFC2046 Local file access
1397     ("mail-server")     ; RFC2046 mail-server Electronic mail address
1398     ("mailto")          ; RFC1738 Electronic mail address
1399     ("news")            ; RFC1738 Usenet news
1400     ("nntp")            ; RFC1738 Usenet news using NNTP access
1401     ("propspero")       ; RFC1738 Prospero Directory Service
1402     ("telnet")          ; RFC1738 Telnet
1403     ("tftp")            ; RFC2046 Trivial File Transfer Protocol
1404     ("url")             ; RFC2017 URL scheme MIME access-type Protocol
1405     ("wais"))           ; RFC1738 Wide Area Information Servers
1406   "Valid MIME access-type values.")
1407
1408 ;;;###mh-autoload
1409 (defun mh-mh-compose-external-type (access-type host filename type
1410                                                 &optional description
1411                                                 attributes parameters
1412                                                 comment)
1413   "Add tag to refer to a remote file.
1414
1415 This command is a general utility for referencing external files.
1416 In fact, all of the other commands that insert directives to
1417 access external files call this command. You are prompted for the
1418 ACCESS-TYPE, remote HOST and FILENAME, and content TYPE. If you
1419 provide a prefix argument, you are also prompted for a content
1420 DESCRIPTION, ATTRIBUTES, PARAMETERS, and a COMMENT.
1421
1422 See also \\[mh-mh-to-mime]."
1423   (interactive (list
1424                 (completing-read "Access type: " mh-access-types)
1425                 (read-string "Remote host: ")
1426                 (read-string "Remote filename: ")
1427                 (mh-minibuffer-read-type "DUMMY-FILENAME")
1428                 (if current-prefix-arg (mml-minibuffer-read-description))
1429                 (if current-prefix-arg (read-string "Attributes: "))
1430                 (if current-prefix-arg (read-string "Parameters: "))
1431                 (if current-prefix-arg (read-string "Comment: "))))
1432   (beginning-of-line)
1433   (insert "#@" type)
1434   (and attributes
1435        (insert "; " attributes))
1436   (and comment
1437        (insert " (" comment ") "))
1438   (insert " [")
1439   (and description
1440        (insert description))
1441   (insert "] ")
1442   (insert "access-type=" access-type "; ")
1443   (insert "site=" host)
1444   (insert "; name=" (file-name-nondirectory filename))
1445   (let ((directory (file-name-directory filename)))
1446     (and directory
1447          (insert "; directory=\"" directory "\"")))
1448   (and parameters
1449        (insert "; " parameters))
1450   (insert "\n"))
1451
1452 (defvar mh-mh-to-mime-args nil
1453   "Extra arguments for \\[mh-mh-to-mime] to pass to the \"mhbuild\" command.
1454 The arguments are passed to \"mhbuild\" if \\[mh-mh-to-mime] is
1455 given a prefix argument. Normally default arguments to
1456 \"mhbuild\" are specified in the MH profile.")
1457
1458 ;;;###mh-autoload
1459 (defun mh-mh-to-mime (&optional extra-args)
1460   "Compose MIME message from MH-style directives.
1461
1462 Typically, you send a message with attachments just like any other
1463 message. However, you may take a sneak preview of the MIME encoding if
1464 you wish by running this command.
1465
1466 If you wish to pass additional arguments to \"mhbuild\" (\"mhn\")
1467 to affect how it builds your message, use the option
1468 `mh-mh-to-mime-args'. For example, you can build a consistency
1469 check into the message by setting `mh-mh-to-mime-args' to
1470 \"-check\". The recipient of your message can then run \"mhbuild
1471 -check\" on the message--\"mhbuild\" (\"mhn\") will complain if
1472 the message has been corrupted on the way. This command only
1473 consults this option when given a prefix argument EXTRA-ARGS.
1474
1475 The hook `mh-mh-to-mime-hook' is called after the message has been
1476 formatted.
1477
1478 The effects of this command can be undone by running
1479 \\[mh-mh-to-mime-undo]."
1480   (interactive "*P")
1481   (mh-mh-quote-unescaped-sharp)
1482   (save-buffer)
1483   (message "Running %s..." (if (mh-variant-p 'nmh) "mhbuild" "mhn"))
1484   (cond
1485    ((mh-variant-p 'nmh)
1486     (mh-exec-cmd-error nil
1487                        "mhbuild"
1488                        (if extra-args mh-mh-to-mime-args)
1489                        buffer-file-name))
1490    (t
1491     (mh-exec-cmd-error (format "mhdraft=%s" buffer-file-name)
1492                        "mhn"
1493                        (if extra-args mh-mh-to-mime-args)
1494                        buffer-file-name)))
1495   (revert-buffer t t t)
1496   (message "Running %s...done" (if (mh-variant-p 'nmh) "mhbuild" "mhn"))
1497   (run-hooks 'mh-mh-to-mime-hook))
1498
1499 (defun mh-mh-quote-unescaped-sharp ()
1500   "Quote \"#\" characters that haven't been quoted for \"mhbuild\".
1501 If the \"#\" character is present in the first column, but it isn't
1502 part of a MH-style directive then \"mhbuild\" gives an error.
1503 This function will quote all such characters."
1504   (save-excursion
1505     (goto-char (point-min))
1506     (while (re-search-forward "^#" nil t)
1507       (beginning-of-line)
1508       (unless (mh-mh-directive-present-p (point) (mh-line-end-position))
1509         (insert "#"))
1510       (goto-char (mh-line-end-position)))))
1511
1512 ;;;###mh-autoload
1513 (defun mh-mh-to-mime-undo (noconfirm)
1514   "Undo effects of \\[mh-mh-to-mime].
1515
1516 It does this by reverting to a backup file. You are prompted to
1517 confirm this action, but you can avoid the confirmation by adding
1518 a prefix argument NOCONFIRM."
1519   (interactive "*P")
1520   (if (null buffer-file-name)
1521       (error "Buffer does not seem to be associated with any file"))
1522   (let ((backup-strings '("," "#"))
1523         backup-file)
1524     (while (and backup-strings
1525                 (not (file-exists-p
1526                       (setq backup-file
1527                             (concat (file-name-directory buffer-file-name)
1528                                     (car backup-strings)
1529                                     (file-name-nondirectory buffer-file-name)
1530                                     ".orig")))))
1531       (setq backup-strings (cdr backup-strings)))
1532     (or backup-strings
1533         (error "Backup file for %s no longer exists" buffer-file-name))
1534     (or noconfirm
1535         (yes-or-no-p (format "Revert buffer from file %s? "
1536                              backup-file))
1537         (error "Revert not confirmed"))
1538     (let ((buffer-read-only nil))
1539       (erase-buffer)
1540       (insert-file-contents backup-file))
1541     (after-find-file nil nil nil nil t)))
1542
1543 ;; Shush compiler.
1544 (defvar mh-identity-pgg-default-user-id)
1545
1546 ;;;###mh-autoload
1547 (defun mh-mml-secure-message-encrypt (method)
1548   "Add tag to encrypt the message.
1549
1550 A proper multipart message is created for you when you send the
1551 message. Use the command \\[mh-mml-unsecure-message] to remove
1552 this tag. Use a prefix argument METHOD to be prompted for one of
1553 the possible security methods (see `mh-mml-method-default')."
1554   (interactive (list (mh-mml-query-cryptographic-method)))
1555   (mh-secure-message method "encrypt" mh-identity-pgg-default-user-id))
1556
1557 ;;;###mh-autoload
1558 (defun mh-mml-secure-message-sign (method)
1559   "Add tag to sign the message.
1560
1561 A proper multipart message is created for you when you send the
1562 message. Use the command \\[mh-mml-unsecure-message] to remove
1563 this tag. Use a prefix argument METHOD to be prompted for one of
1564 the possible security methods (see `mh-mml-method-default')."
1565   (interactive (list (mh-mml-query-cryptographic-method)))
1566   (mh-secure-message method "sign" mh-identity-pgg-default-user-id))
1567
1568 ;;;###mh-autoload
1569 (defun mh-mml-secure-message-signencrypt (method)
1570   "Add tag to encrypt and sign the message.
1571
1572 A proper multipart message is created for you when you send the
1573 message. Use the command \\[mh-mml-unsecure-message] to remove
1574 this tag. Use a prefix argument METHOD to be prompted for one of
1575 the possible security methods (see `mh-mml-method-default')."
1576   (interactive (list (mh-mml-query-cryptographic-method)))
1577   (mh-secure-message method "signencrypt" mh-identity-pgg-default-user-id))
1578
1579 (defvar mh-mml-cryptographic-method-history ())
1580
1581 (defun mh-mml-query-cryptographic-method ()
1582   "Read the cryptographic method to use."
1583   (if current-prefix-arg
1584       (let ((def (or (car mh-mml-cryptographic-method-history)
1585                      mh-mml-method-default)))
1586         (completing-read (format "Method (default %s): " def)
1587                          '(("pgp") ("pgpmime") ("smime"))
1588                          nil t nil 'mh-mml-cryptographic-method-history def))
1589     mh-mml-method-default))
1590
1591 (defun mh-secure-message (method mode &optional identity)
1592   "Add tag to encrypt or sign message.
1593
1594 METHOD should be one of: \"pgpmime\", \"pgp\", \"smime\".
1595 MODE should be one of: \"sign\", \"encrypt\", \"signencrypt\", \"none\".
1596 IDENTITY is optionally the default-user-id to use."
1597   (if (not mh-pgp-support-flag)
1598       (error "Your version of Gnus does not support PGP/GPG")
1599     ;; Check the arguments
1600     (let ((valid-methods (list "pgpmime" "pgp" "smime"))
1601           (valid-modes (list "sign" "encrypt" "signencrypt" "none")))
1602       (if (not (member method valid-methods))
1603           (error "Method %s is invalid" method))
1604       (if (not (member mode valid-modes))
1605           (error "Mode %s is invalid" mode))
1606       (mml-unsecure-message)
1607       (if (not (string= mode "none"))
1608         (save-excursion
1609           (goto-char (point-min))
1610           (mh-goto-header-end 1)
1611           (if mh-identity-pgg-default-user-id
1612               (mml-insert-tag 'secure 'method method 'mode mode
1613                               'sender mh-identity-pgg-default-user-id)
1614             (mml-insert-tag 'secure 'method method 'mode mode)))))))
1615
1616 ;;;###mh-autoload
1617 (defun mh-mml-to-mime ()
1618   "Compose MIME message from MML tags.
1619
1620 Typically, you send a message with attachments just like any
1621 other message. However, you may take a sneak preview of the MIME
1622 encoding if you wish by running this command.
1623
1624 This action can be undone by running \\[undo]."
1625   (interactive)
1626   (require 'message)
1627   (when mh-pgp-support-flag
1628     ;; PGP requires actual e-mail addresses, not aliases.
1629     ;; Parse the recipients and sender from the message.
1630     (message-options-set-recipient)
1631     ;; Do an alias lookup on sender (if From field is present).
1632     (when (message-options-get 'message-sender)
1633       (message-options-set 'message-sender
1634                            (mail-strip-quoted-names
1635                             (mh-alias-expand
1636                              (message-options-get 'message-sender)))))
1637     ;; Do an alias lookup on recipients
1638     (message-options-set 'message-recipients
1639                          (mapconcat
1640                           '(lambda (ali)
1641                              (mail-strip-quoted-names (mh-alias-expand ali)))
1642                           (split-string (message-options-get 'message-recipients) "[, ]+")
1643                           ", ")))
1644   (let ((saved-text (buffer-string))
1645         (buffer (current-buffer))
1646         (modified-flag (buffer-modified-p)))
1647     (condition-case err (mml-to-mime)
1648       (error
1649        (with-current-buffer buffer
1650          (delete-region (point-min) (point-max))
1651          (insert saved-text)
1652          (set-buffer-modified-p modified-flag))
1653        (error (error-message-string err))))))
1654
1655 ;;;###mh-autoload
1656 (defun mh-mml-unsecure-message ()
1657   "Remove any secure message tags."
1658   (interactive)
1659   (if (not mh-pgp-support-flag)
1660       (error "Your version of Gnus does not support PGP/GPG")
1661     (mml-unsecure-message)))
1662
1663 \f
1664
1665 ;;; Support Routines for MH-Letter Commands
1666
1667 ;;;###mh-autoload
1668 (defun mh-mml-tag-present-p ()
1669   "Check if the current buffer has text which may be a MML tag."
1670   (save-excursion
1671     (goto-char (point-min))
1672     (re-search-forward
1673      (concat
1674       "\\(<#\\(mml\\|part\\)\\(.\\|\n\\)*>[ \n\t]*<#/\\(mml\\|part\\)>\\|"
1675       "^<#secure.+>$\\)")
1676      nil t)))
1677
1678 (defvar mh-media-type-regexp
1679   (concat (regexp-opt '("text" "image" "audio" "video" "application"
1680                         "multipart" "message") t)
1681           "/[-.+a-zA-Z0-9]+")
1682   "Regexp matching valid media types used in MIME attachment compositions.")
1683
1684 ;;;###mh-autoload
1685 (defun mh-mh-directive-present-p (&optional begin end)
1686   "Check if the text between BEGIN and END might be a MH-style directive.
1687 The optional argument BEGIN defaults to the beginning of the
1688 buffer, while END defaults to the end of the buffer."
1689   (unless begin (setq begin (point-min)))
1690   (unless end (setq end (point-max)))
1691   (save-excursion
1692     (block 'search-for-mh-directive
1693       (goto-char begin)
1694       (while (re-search-forward "^#" end t)
1695         (let ((s (buffer-substring-no-properties
1696                   (point) (mh-line-end-position))))
1697           (cond ((equal s ""))
1698                 ((string-match "^forw[ \t\n]+" s)
1699                  (return-from 'search-for-mh-directive t))
1700                 (t (let ((first-token (car (split-string s "[ \t;@]"))))
1701                      (when (and first-token
1702                                 (string-match mh-media-type-regexp
1703                                               first-token))
1704                        (return-from 'search-for-mh-directive t)))))))
1705       nil)))
1706
1707 (defun mh-minibuffer-read-type (filename &optional default)
1708   "Return the content type associated with the given FILENAME.
1709 If the \"file\" command exists and recognizes the given file,
1710 then its value is returned\; otherwise, the user is prompted for
1711 a type (see `mailcap-mime-types').
1712 Optional argument DEFAULT is returned if a type isn't entered."
1713   (mailcap-parse-mimetypes)
1714   (let* ((default (or default
1715                       (mm-default-file-encoding filename)
1716                       "application/octet-stream"))
1717          (probed-type (mh-file-mime-type filename))
1718          (type (or (and (not (equal probed-type "application/octet-stream"))
1719                         probed-type)
1720                    (completing-read
1721                     (format "Content type (default %s): " default)
1722                     (mapcar 'list (mailcap-mime-types))))))
1723     (if (not (equal type ""))
1724         type
1725       default)))
1726
1727 ;;;###mh-autoload
1728 (defun mh-file-mime-type (filename)
1729   "Return MIME type of FILENAME from file command.
1730 Returns nil if file command not on system."
1731   (cond
1732    ((not (mh-have-file-command))
1733     nil)                                ;no file command, exit now
1734    ((not (and (file-exists-p filename)
1735               (file-readable-p filename)))
1736     nil)                               ;no file or not readable, ditto
1737    (t
1738     (let ((tmp-buffer (get-buffer-create mh-temp-buffer)))
1739       (with-current-buffer tmp-buffer
1740         (unwind-protect
1741             (progn
1742               (call-process "file" nil '(t nil) nil "-b" "-i"
1743                             (expand-file-name filename))
1744               (goto-char (point-min))
1745               (if (not (re-search-forward mh-media-type-regexp nil t))
1746                   nil
1747                 (mh-file-mime-type-substitute (match-string 0) filename)))
1748           (kill-buffer tmp-buffer)))))))
1749
1750 (defvar mh-file-mime-type-substitutions
1751   '(("application/msword" "\.xls" "application/ms-excel")
1752     ("application/msword" "\.ppt" "application/ms-powerpoint")
1753     ("text/plain" "\.vcf" "text/x-vcard")
1754     ("text/rtf" "\.rtf" "application/rtf")
1755     ("application/x-zip" "\.sxc" "application/vnd.sun.xml.calc")
1756     ("application/x-zip" "\.sxd" "application/vnd.sun.xml.draw")
1757     ("application/x-zip" "\.sxi" "application/vnd.sun.xml.impress")
1758     ("application/x-zip" "\.sxw" "application/vnd.sun.xml.writer")
1759     ("application/x-zip" "\.odg" "application/vnd.oasis.opendocument.graphics")
1760     ("application/x-zip" "\.odi" "application/vnd.oasis.opendocument.image")
1761     ("application/x-zip" "\.odp"
1762      "application/vnd.oasis.opendocument.presentation")
1763     ("application/x-zip" "\.ods"
1764      "application/vnd.oasis.opendocument.spreadsheet")
1765     ("application/x-zip" "\.odt" "application/vnd.oasis.opendocument.text"))
1766   "Substitutions to make for Content-Type returned from file command.
1767 The first element is the Content-Type returned by the file command.
1768 The second element is a regexp matching the file name, usually the
1769 extension.
1770 The third element is the Content-Type to replace with.")
1771
1772 (defun mh-file-mime-type-substitute (content-type filename)
1773   "Return possibly changed CONTENT-TYPE on the FILENAME.
1774 Substitutions are made from the `mh-file-mime-type-substitutions'
1775 variable."
1776   (let ((subst mh-file-mime-type-substitutions)
1777         (type) (match) (answer content-type)
1778         (case-fold-search t))
1779     (while subst
1780       (setq type (car (car subst))
1781             match (elt (car subst) 1))
1782       (if (and (string-equal content-type type)
1783                (string-match match filename))
1784           (setq answer (elt (car subst) 2)
1785                 subst nil)
1786         (setq subst (cdr subst))))
1787     answer))
1788
1789 (defvar mh-have-file-command 'undefined
1790   "Cached value of function `mh-have-file-command'.
1791 Do not reference this variable directly as it might not have been
1792 initialized. Always use the command `mh-have-file-command'.")
1793
1794 ;;;###mh-autoload
1795 (defun mh-have-file-command ()
1796   "Return t if 'file' command is on the system.
1797 'file -i' is used to get MIME type of composition insertion."
1798   (when (eq mh-have-file-command 'undefined)
1799     (setq mh-have-file-command
1800           (and (fboundp 'executable-find)
1801                (executable-find "file") ; file command exists
1802                                         ;   and accepts -i and -b args.
1803                (zerop (call-process "file" nil nil nil "-i" "-b"
1804                                     (expand-file-name "inc" mh-progs))))))
1805   mh-have-file-command)
1806
1807 \f
1808
1809 ;;; MIME Cleanup
1810
1811 ;;;###mh-autoload
1812 (defun mh-mime-cleanup ()
1813   "Free the decoded MIME parts."
1814   (let ((mime-data (gethash (current-buffer) mh-globals-hash)))
1815     ;; This is for Emacs, what about XEmacs?
1816     (mh-funcall-if-exists remove-images (point-min) (point-max))
1817     (when mime-data
1818       (mh-mm-destroy-parts (mh-mime-handles mime-data))
1819       (remhash (current-buffer) mh-globals-hash))))
1820
1821 ;;;###mh-autoload
1822 (defun mh-destroy-postponed-handles ()
1823   "Free MIME data for externally displayed MIME parts."
1824   (let ((mime-data (mh-buffer-data)))
1825     (when mime-data
1826       (mh-mm-destroy-parts (mh-mime-handles mime-data)))
1827     (remhash (current-buffer) mh-globals-hash)))
1828
1829 (provide 'mh-mime)
1830
1831 ;; Local Variables:
1832 ;; indent-tabs-mode: nil
1833 ;; sentence-end-double-space: nil
1834 ;; End:
1835
1836 ;;; mh-mime.el ends here