lisp/mh-e/mh-mime.el

   1 ;;; mh-mime.el --- MH-E MIME support
   2
   3 ;; Copyright (C) 1993, 1995,
   4 ;;  2001, 2002, 2003, 2004, 2005, 2006, 2007 Free Software Foundation, Inc.
   5
   6 ;; Author: Bill Wohler <wohler@newt.com>
   7 ;; Maintainer: Bill Wohler <wohler@newt.com>
   8 ;; Keywords: mail
   9 ;; See: mh-e.el
  10
  11 ;; This file is part of GNU Emacs.
  12
  13 ;; GNU Emacs is free software; you can redistribute it and/or modify
  14 ;; it under the terms of the GNU General Public License as published by
  15 ;; the Free Software Foundation; either version 3, or (at your option)
  16 ;; any later version.
  17
  18 ;; GNU Emacs is distributed in the hope that it will be useful,
  19 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  20 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21 ;; GNU General Public License for more details.
  22
  23 ;; You should have received a copy of the GNU General Public License
  24 ;; along with GNU Emacs; see the file COPYING.  If not, write to the
  25 ;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  26 ;; Boston, MA 02110-1301, USA.
  27
  28 ;;; Commentary:
  29
  30 ;; Message composition of MIME message is done with either MH-style
  31 ;; directives for mhn or mhbuild (MH 6.8 or later) or MML (MIME Meta
  32 ;; Language) tags.
  33
  34 ;; TODO:
  35 ;;   Paragraph code should not fill # lines if MIME enabled.
  36 ;;   Implement mh-auto-mh-to-mime (if non-nil, \\[mh-send-letter]
  37 ;;      invokes mh-mh-to-mime automatically before sending.)
  38 ;;      Actually, instead of mh-auto-mh-to-mime,
  39 ;;      should read automhnproc from profile.
  40 ;;   MIME option to mh-forward command to move to content-description
  41 ;;   insertion point.
  42
  43 ;;; Change Log:
  44
  45 ;;; Code:
  46
  47 (require 'mh-e)
  48 (require 'mh-gnus)                      ;needed because mh-gnus.el not compiled
  49
  50 (require 'font-lock)
  51 (require 'gnus-util)
  52 (require 'mailcap)
  53 (require 'mm-decode)
  54 (require 'mm-view)
  55 (require 'mml)
  56
  57 (autoload 'article-emphasize "gnus-art")
  58 (autoload 'gnus-eval-format "gnus-spec")
  59 (autoload 'mail-content-type-get "mail-parse")
  60 (autoload 'mail-decode-encoded-word-string "mail-parse")
  61 (autoload 'mail-header-parse-content-type "mail-parse")
  62 (autoload 'mail-header-strip "mail-parse")
  63 (autoload 'mail-strip-quoted-names "mail-utils")
  64 (autoload 'message-options-get "message")
  65 (autoload 'message-options-set "message")
  66 (autoload 'message-options-set-recipient "message")
  67 (autoload 'mm-decode-body "mm-bodies")
  68 (autoload 'mm-uu-dissect "mm-uu")
  69 (autoload 'mml-unsecure-message "mml-sec")
  70 (autoload 'rfc2047-decode-region "rfc2047")
  71 (autoload 'widget-convert-button "wid-edit")
  72
  73 \f
  74
  75 ;;; Variables
  76
  77 ;; This has to be a macro, since we do: (setf (mh-buffer-data) ...)
  78 ;;;###mh-autoload
  79 (defmacro mh-buffer-data ()
  80   "Convenience macro to get the MIME data structures of the current buffer."
  81   `(gethash (current-buffer) mh-globals-hash))
  82
  83 ;; Structure to keep track of MIME handles on a per buffer basis.
  84 (mh-defstruct (mh-buffer-data (:conc-name mh-mime-)
  85                               (:constructor mh-make-buffer-data))
  86   (handles ())                          ; List of MIME handles
  87   (handles-cache (make-hash-table))     ; Cache to avoid multiple decodes of
  88                                         ; nested messages
  89   (parts-count 0)                       ; The button number is generated from
  90                                         ; this number
  91   (part-index-hash (make-hash-table)))  ; Avoid incrementing the part number
  92                                         ; for nested messages
  93
  94 (defvar mh-mm-inline-media-tests
  95   `(("image/jpeg"
  96      mm-inline-image
  97      (lambda (handle)
  98        (mm-valid-and-fit-image-p 'jpeg handle)))
  99     ("image/png"
 100      mm-inline-image
 101      (lambda (handle)
 102        (mm-valid-and-fit-image-p 'png handle)))
 103     ("image/gif"
 104      mm-inline-image
 105      (lambda (handle)
 106        (mm-valid-and-fit-image-p 'gif handle)))
 107     ("image/tiff"
 108      mm-inline-image
 109      (lambda (handle)
 110        (mm-valid-and-fit-image-p 'tiff handle)) )
 111     ("image/xbm"
 112      mm-inline-image
 113      (lambda (handle)
 114        (mm-valid-and-fit-image-p 'xbm handle)))
 115     ("image/x-xbitmap"
 116      mm-inline-image
 117      (lambda (handle)
 118        (mm-valid-and-fit-image-p 'xbm handle)))
 119     ("image/xpm"
 120      mm-inline-image
 121      (lambda (handle)
 122        (mm-valid-and-fit-image-p 'xpm handle)))
 123     ("image/x-pixmap"
 124      mm-inline-image
 125      (lambda (handle)
 126        (mm-valid-and-fit-image-p 'xpm handle)))
 127     ("image/bmp"
 128      mm-inline-image
 129      (lambda (handle)
 130        (mm-valid-and-fit-image-p 'bmp handle)))
 131     ("image/x-portable-bitmap"
 132      mm-inline-image
 133      (lambda (handle)
 134        (mm-valid-and-fit-image-p 'pbm handle)))
 135     ("text/plain" mm-inline-text identity)
 136     ("text/enriched" mm-inline-text identity)
 137     ("text/richtext" mm-inline-text identity)
 138     ("text/x-patch" mm-display-patch-inline
 139      (lambda (handle)
 140        (locate-library "diff-mode")))
 141     ("application/emacs-lisp" mm-display-elisp-inline identity)
 142     ("application/x-emacs-lisp" mm-display-elisp-inline identity)
 143     ("text/html"
 144      ,(if (fboundp 'mm-inline-text-html) 'mm-inline-text-html 'mm-inline-text)
 145      (lambda (handle)
 146        (or (and (boundp 'mm-inline-text-html-renderer)
 147                 mm-inline-text-html-renderer)
 148            (and (boundp 'mm-text-html-renderer) mm-text-html-renderer))))
 149     ("text/x-vcard"
 150      mh-mm-inline-text-vcard
 151      (lambda (handle)
 152        (or (featurep 'vcard)
 153            (locate-library "vcard"))))
 154     ("message/delivery-status" mm-inline-text identity)
 155     ("message/rfc822" mh-mm-inline-message identity)
 156     ;;("message/partial" mm-inline-partial identity)
 157     ;;("message/external-body" mm-inline-external-body identity)
 158     ("text/.*" mm-inline-text identity)
 159     ("audio/wav" mm-inline-audio
 160      (lambda (handle)
 161        (and (or (featurep 'nas-sound) (featurep 'native-sound))
 162             (device-sound-enabled-p))))
 163     ("audio/au"
 164      mm-inline-audio
 165      (lambda (handle)
 166        (and (or (featurep 'nas-sound) (featurep 'native-sound))
 167             (device-sound-enabled-p))))
 168     ("application/pgp-signature" ignore identity)
 169     ("application/x-pkcs7-signature" ignore identity)
 170     ("application/pkcs7-signature" ignore identity)
 171     ("application/x-pkcs7-mime" ignore identity)
 172     ("application/pkcs7-mime" ignore identity)
 173     ("multipart/alternative" ignore identity)
 174     ("multipart/mixed" ignore identity)
 175     ("multipart/related" ignore identity)
 176     ;; Disable audio and image
 177     ("audio/.*" ignore ignore)
 178     ("image/.*" ignore ignore)
 179     ;; Default to displaying as text
 180     (".*" mm-inline-text mh-mm-readable-p))
 181   "Alist of media types/tests saying whether types can be displayed inline.")
 182
 183 (defvar mh-mime-save-parts-directory nil
 184   "Default to use for `mh-mime-save-parts-default-directory'.
 185 Set from last use.")
 186
 187 ;; Copied from gnus-art.el (should be checked for other cool things that can
 188 ;; be added to the buttons)
 189 (defvar mh-mime-button-commands
 190   '((mh-press-button "\r" "Toggle Display")))
 191 (defvar mh-mime-button-map
 192   (let ((map (make-sparse-keymap)))
 193     (unless (>= (string-to-number emacs-version) 21)
 194       ;; XEmacs doesn't care.
 195       (set-keymap-parent map mh-show-mode-map))
 196     (mh-do-in-gnu-emacs
 197      (define-key map [mouse-2] 'mh-push-button))
 198     (mh-do-in-xemacs
 199      (define-key map '(button2) 'mh-push-button))
 200     (dolist (c mh-mime-button-commands)
 201       (define-key map (cadr c) (car c)))
 202     map))
 203 (defvar mh-mime-button-line-format-alist
 204   '((?T long-type ?s)
 205     (?d description ?s)
 206     (?p index ?s)
 207     (?e dots ?s)))
 208 (defvar mh-mime-button-line-format "%{%([%p. %d%T]%)%}%e\n")
 209 (defvar mh-mime-security-button-pressed nil)
 210 (defvar mh-mime-security-button-line-format "%{%([[%t:%i]%D]%)%}\n")
 211 (defvar mh-mime-security-button-end-line-format "%{%([[End of %t]%D]%)%}\n")
 212 (defvar mh-mime-security-button-line-format-alist
 213   '((?t type ?s)
 214     (?i info ?s)
 215     (?d details ?s)
 216     (?D pressed-details ?s)))
 217 (defvar mh-mime-security-button-map
 218   (let ((map (make-sparse-keymap)))
 219     (unless (>= (string-to-number emacs-version) 21)
 220       (set-keymap-parent map mh-show-mode-map))
 221     (define-key map "\r" 'mh-press-button)
 222     (mh-do-in-gnu-emacs
 223      (define-key map [mouse-2] 'mh-push-button))
 224     (mh-do-in-xemacs
 225      (define-key map '(button2) 'mh-push-button))
 226     map))
 227
 228 \f
 229
 230 ;;; MH-Folder Commands
 231
 232 ;; Alphabetical.
 233
 234 ;;;###mh-autoload
 235 (defun mh-display-with-external-viewer (part-index)
 236   "View attachment externally.
 237
 238 If Emacs does not know how to view an attachment, you could save
 239 it into a file and then run some program to open it. It is
 240 easier, however, to launch the program directly from MH-E with
 241 this command. While you'll most likely use this to view
 242 spreadsheets and documents, it is also useful to use your browser
 243 to view HTML attachments with higher fidelity than what Emacs can
 244 provide.
 245
 246 This command displays the attachment associated with the button
 247 under the cursor. If the cursor is not located over a button,
 248 then the cursor first moves to the next button, wrapping to the
 249 beginning of the message if necessary. You can provide a numeric
 250 prefix argument PART-INDEX to view the attachment labeled with
 251 that number.
 252
 253 This command tries to provide a reasonable default for the viewer
 254 by calling the Emacs function `mailcap-mime-info'. This function
 255 usually reads the file \"/etc/mailcap\"."
 256   (interactive "P")
 257   (when (consp part-index) (setq part-index (car part-index)))
 258   (mh-folder-mime-action
 259    part-index
 260    #'(lambda ()
 261        (let* ((part (get-text-property (point) 'mh-data))
 262               (type (mm-handle-media-type part))
 263               (methods (mapcar (lambda (x) (list (cdr (assoc 'viewer x))))
 264                                (mailcap-mime-info type 'all)))
 265               (def (caar methods))
 266               (prompt (format "Viewer%s: " (if def
 267                                                (format " (default %s)" def)
 268                                              "")))
 269               (method (completing-read prompt methods nil nil nil nil def))
 270               (folder mh-show-folder-buffer)
 271               (buffer-read-only nil))
 272          (when (string-match "^[^% \t]+$" method)
 273            (setq method (concat method " %s")))
 274          (flet ((mm-handle-set-external-undisplayer (handle function)
 275                   (mh-handle-set-external-undisplayer folder handle function)))
 276            (unwind-protect (mm-display-external part method)
 277              (set-buffer-modified-p nil)))))
 278    nil))
 279
 280 ;;;###mh-autoload
 281 (defun mh-folder-inline-mime-part (part-index)
 282   "Show attachment verbatim.
 283
 284 You can view the raw contents of an attachment with this command.
 285 This command displays (or hides) the contents of the attachment
 286 associated with the button under the cursor verbatim. If the
 287 cursor is not located over a button, then the cursor first moves
 288 to the next button, wrapping to the beginning of the message if
 289 necessary.
 290
 291 You can also provide a numeric prefix argument PART-INDEX to view
 292 the attachment labeled with that number."
 293   (interactive "P")
 294   (when (consp part-index) (setq part-index (car part-index)))
 295   (mh-folder-mime-action part-index #'mh-mime-inline-part nil))
 296
 297 (defun mh-mime-inline-part ()
 298   "Toggle display of the raw MIME part."
 299   (interactive)
 300   (let* ((buffer-read-only nil)
 301          (data (get-text-property (point) 'mh-data))
 302          (inserted-flag (get-text-property (point) 'mh-mime-inserted))
 303          (displayed-flag (mm-handle-displayed-p data))
 304          (point (point))
 305          start end)
 306     (cond ((and data (not inserted-flag) (not displayed-flag))
 307            (let ((contents (mm-get-part data)))
 308              (add-text-properties (mh-line-beginning-position)
 309                                   (mh-line-end-position) '(mh-mime-inserted t))
 310              (setq start (point-marker))
 311              (forward-line 1)
 312              (mm-insert-inline data contents)
 313              (setq end (point-marker))
 314              (add-text-properties
 315               start (progn (goto-char start) (mh-line-end-position))
 316               `(mh-region (,start . ,end)))))
 317           ((and data (or inserted-flag displayed-flag))
 318            (mh-press-button)
 319            (message "MIME part already inserted")))
 320     (goto-char point)
 321     (set-buffer-modified-p nil)))
 322
 323 ;;;###mh-autoload
 324 (defun mh-folder-save-mime-part (part-index)
 325   "Save (output) attachment.
 326
 327 This command saves the attachment associated with the button under the
 328 cursor. If the cursor is not located over a button, then the cursor
 329 first moves to the next button, wrapping to the beginning of the
 330 message if necessary.
 331
 332 You can also provide a numeric prefix argument PART-INDEX to save the
 333 attachment labeled with that number.
 334
 335 This command prompts you for a filename and suggests a specific name
 336 if it is available."
 337   (interactive "P")
 338   (when (consp part-index) (setq part-index (car part-index)))
 339   (mh-folder-mime-action part-index #'mh-mime-save-part nil))
 340
 341 (defun mh-mime-save-part ()
 342   "Save MIME part at point."
 343   (interactive)
 344   (let ((data (get-text-property (point) 'mh-data)))
 345     (when data
 346       (let ((mm-default-directory
 347              (file-name-as-directory (or mh-mime-save-parts-directory
 348                                          default-directory))))
 349         (mh-mm-save-part data)
 350         (setq mh-mime-save-parts-directory mm-default-directory)))))
 351
 352 ;;;###mh-autoload
 353 (defun mh-folder-toggle-mime-part (part-index)
 354   "View attachment.
 355
 356 This command displays (or hides) the attachment associated with
 357 the button under the cursor. If the cursor is not located over a
 358 button, then the cursor first moves to the next button, wrapping
 359 to the beginning of the message if necessary. This command has
 360 the advantage over related commands of working from the MH-Folder
 361 buffer.
 362
 363 You can also provide a numeric prefix argument PART-INDEX to view
 364 the attachment labeled with that number. If Emacs does not know
 365 how to display the attachment, then Emacs offers to save the
 366 attachment in a file."
 367   (interactive "P")
 368   (when (consp part-index) (setq part-index (car part-index)))
 369   (mh-folder-mime-action part-index #'mh-press-button t))
 370
 371 ;;;###mh-autoload
 372 (defun mh-mime-save-parts (prompt)
 373   "Save attachments.
 374
 375 You can save all of the attachments at once with this command.
 376 The attachments are saved in the directory specified by the
 377 option `mh-mime-save-parts-default-directory' unless you use a
 378 prefix argument PROMPT in which case you are prompted for the
 379 directory. These directories may be superseded by MH profile
 380 components, since this function calls on \"mhstore\" (\"mhn\") to
 381 do the work."
 382   (interactive "P")
 383   (let ((msg (if (eq major-mode 'mh-show-mode)
 384                  (mh-show-buffer-message-number)
 385                (mh-get-msg-num t)))
 386         (folder (if (eq major-mode 'mh-show-mode)
 387                     mh-show-folder-buffer
 388                   mh-current-folder))
 389         (command (if (mh-variant-p 'nmh) "mhstore" "mhn"))
 390         (directory
 391          (cond
 392           ((and (or prompt
 393                     (equal nil mh-mime-save-parts-default-directory)
 394                     (equal t mh-mime-save-parts-default-directory))
 395                 (not mh-mime-save-parts-directory))
 396            (read-file-name "Store in directory: " nil nil t nil))
 397           ((and (or prompt
 398                     (equal t mh-mime-save-parts-default-directory))
 399                 mh-mime-save-parts-directory)
 400            (read-file-name (format
 401                             "Store in directory (default %s): "
 402                             mh-mime-save-parts-directory)
 403                            "" mh-mime-save-parts-directory t ""))
 404           ((stringp mh-mime-save-parts-default-directory)
 405            mh-mime-save-parts-default-directory)
 406           (t
 407            mh-mime-save-parts-directory))))
 408     (if (and (equal directory "") mh-mime-save-parts-directory)
 409         (setq directory mh-mime-save-parts-directory))
 410     (if (not (file-directory-p directory))
 411         (message "No directory specified")
 412       (if (equal nil mh-mime-save-parts-default-directory)
 413           (setq mh-mime-save-parts-directory directory))
 414       (save-excursion
 415         (set-buffer (get-buffer-create mh-log-buffer))
 416         (cd directory)
 417         (setq mh-mime-save-parts-directory directory)
 418         (let ((initial-size (mh-truncate-log-buffer)))
 419           (apply 'call-process
 420                  (expand-file-name command mh-progs) nil t nil
 421                  (mh-list-to-string (list folder msg "-auto"
 422                                           (if (not (mh-variant-p 'nmh))
 423                                               "-store"))))
 424           (if (> (buffer-size) initial-size)
 425               (save-window-excursion
 426                 (switch-to-buffer-other-window mh-log-buffer)
 427                 (sit-for 3))))))))
 428
 429 ;;;###mh-autoload
 430 (defun mh-toggle-mh-decode-mime-flag ()
 431   "Toggle the value of `mh-decode-mime-flag'."
 432   (interactive)
 433   (setq mh-decode-mime-flag (not mh-decode-mime-flag))
 434   (mh-show nil t)
 435   (message "%s" (if mh-decode-mime-flag
 436                     "Processing attachments normally"
 437                   "Displaying raw message")))
 438
 439 ;;;###mh-autoload
 440 (defun mh-toggle-mime-buttons ()
 441   "Toggle option `mh-display-buttons-for-inline-parts-flag'."
 442   (interactive)
 443   (setq mh-display-buttons-for-inline-parts-flag
 444         (not mh-display-buttons-for-inline-parts-flag))
 445   (mh-show nil t))
 446
 447 \f
 448
 449 ;;; MIME Display Routines
 450
 451 (defun mh-mm-inline-message (handle)
 452   "Display message, HANDLE.
 453 The function decodes the message and displays it. It avoids
 454 decoding the same message multiple times."
 455   (let ((b (point))
 456         (clean-message-header mh-clean-message-header-flag)
 457         (invisible-headers mh-invisible-header-fields-compiled)
 458         (visible-headers nil))
 459     (save-excursion
 460       (save-restriction
 461         (narrow-to-region b b)
 462         (mm-insert-part handle)
 463         (mh-mime-display
 464          (or (gethash handle (mh-mime-handles-cache (mh-buffer-data)))
 465              (setf (gethash handle (mh-mime-handles-cache (mh-buffer-data)))
 466                    (let ((handles (mm-dissect-buffer nil)))
 467                      (if handles
 468                          (mh-mm-uu-dissect-text-parts handles)
 469                        (setq handles (mm-uu-dissect)))
 470                      (setf (mh-mime-handles (mh-buffer-data))
 471                            (mh-mm-merge-handles
 472                             handles (mh-mime-handles (mh-buffer-data))))
 473                      handles))))
 474
 475         (goto-char (point-min))
 476         (mh-show-xface)
 477         (cond (clean-message-header
 478                (mh-clean-msg-header (point-min)
 479                                     invisible-headers
 480                                     visible-headers)
 481                (goto-char (point-min)))
 482               (t
 483                (mh-start-of-uncleaned-message)))
 484         (mh-decode-message-header)
 485         (mh-show-addr)
 486         ;; The other highlighting types don't need anything special
 487         (when (eq mh-highlight-citation-style 'gnus)
 488           (mh-gnus-article-highlight-citation))
 489         (goto-char (point-min))
 490         (insert "\n------- Forwarded Message\n\n")
 491         (mh-display-smileys)
 492         (mh-display-emphasis)
 493         (mm-handle-set-undisplayer
 494          handle
 495          `(lambda ()
 496             (let (buffer-read-only)
 497               (if (fboundp 'remove-specifier)
 498                   ;; This is only valid on XEmacs.
 499                   (mapcar (lambda (prop)
 500                             (remove-specifier
 501                              (face-property 'default prop) (current-buffer)))
 502                           '(background background-pixmap foreground)))
 503               (delete-region ,(point-min-marker) ,(point-max-marker)))))))))
 504
 505 ;;;###mh-autoload
 506 (defun mh-decode-message-header ()
 507   "Decode RFC2047 encoded message header fields."
 508   (when mh-decode-mime-flag
 509     (let ((buffer-read-only nil))
 510       (rfc2047-decode-region (point-min) (mh-mail-header-end)))))
 511
 512 ;;;###mh-autoload
 513 (defun mh-mime-display (&optional pre-dissected-handles)
 514   "Display (and possibly decode) MIME handles.
 515 Optional argument, PRE-DISSECTED-HANDLES is a list of MIME
 516 handles. If present they are displayed otherwise the buffer is
 517 parsed and then displayed."
 518   (let ((handles ())
 519         (folder mh-show-folder-buffer)
 520         (raw-message-data (buffer-string)))
 521     (flet ((mm-handle-set-external-undisplayer
 522             (handle function)
 523             (mh-handle-set-external-undisplayer folder handle function)))
 524       (goto-char (point-min))
 525       (unless (search-forward "\n\n" nil t)
 526         (goto-char (point-max))
 527         (insert "\n\n"))
 528
 529       (condition-case err
 530           (progn
 531             ;; If needed dissect the current buffer
 532             (if pre-dissected-handles
 533                 (setq handles pre-dissected-handles)
 534               (if (setq handles (mm-dissect-buffer nil))
 535                   (mh-mm-uu-dissect-text-parts handles)
 536                 (setq handles (mm-uu-dissect)))
 537               (setf (mh-mime-handles (mh-buffer-data))
 538                     (mh-mm-merge-handles handles
 539                                          (mh-mime-handles (mh-buffer-data))))
 540               (unless handles
 541                 (mh-decode-message-body)))
 542
 543             (cond ((and handles
 544                         (or (not (stringp (car handles)))
 545                             (cdr handles)))
 546                    ;; Go to start of message body
 547                    (goto-char (point-min))
 548                    (or (search-forward "\n\n" nil t)
 549                        (goto-char (point-max)))
 550
 551                    ;; Delete the body
 552                    (delete-region (point) (point-max))
 553
 554                    ;; Display the MIME handles
 555                    (mh-mime-display-part handles))
 556                   (t
 557                    (mh-signature-highlight))))
 558         (error
 559          (message "Could not display body: %s" (error-message-string err))
 560          (delete-region (point-min) (point-max))
 561          (insert raw-message-data))))))
 562
 563 (defun mh-decode-message-body ()
 564   "Decode message based on charset.
 565 If message has been encoded for transfer take that into account."
 566   (let (ct charset cte)
 567     (goto-char (point-min))
 568     (re-search-forward "\n\n" nil t)
 569     (save-restriction
 570       (narrow-to-region (point-min) (point))
 571       (setq ct (ignore-errors (mail-header-parse-content-type
 572                                (message-fetch-field "Content-Type" t)))
 573             charset (mail-content-type-get ct 'charset)
 574             cte (message-fetch-field "Content-Transfer-Encoding")))
 575     (when (stringp cte) (setq cte (mail-header-strip cte)))
 576     (when (or (not ct) (equal (car ct) "text/plain"))
 577       (save-restriction
 578         (narrow-to-region (min (1+ (mh-mail-header-end)) (point-max))
 579                           (point-max))
 580         (mm-decode-body charset
 581                         (and cte (intern (downcase
 582                                           (gnus-strip-whitespace cte))))
 583                         (car ct))))))
 584
 585 (defun mh-mime-display-part (handle)
 586   "Decides the viewer to call based on the type of HANDLE."
 587   (cond ((null handle)
 588          nil)
 589         ((not (stringp (car handle)))
 590          (mh-mime-display-single handle))
 591         ((equal (car handle) "multipart/alternative")
 592          (mh-mime-display-alternative (cdr handle)))
 593         ((and mh-pgp-support-flag
 594               (or (equal (car handle) "multipart/signed")
 595                   (equal (car handle) "multipart/encrypted")))
 596          (mh-mime-display-security handle))
 597         (t
 598          (mh-mime-display-mixed (cdr handle)))))
 599
 600 (defun mh-mime-display-mixed (handles)
 601   "Display the list of MIME parts, HANDLES recursively."
 602   (mapcar #'mh-mime-display-part handles))
 603
 604 (defun mh-mime-display-alternative (handles)
 605   "Choose among the alternatives, HANDLES the part that will be displayed.
 606 If no part is preferred then all the parts are displayed."
 607   (let* ((preferred (mm-preferred-alternative handles))
 608          (others (loop for x in handles unless (eq x preferred) collect x)))
 609     (cond ((and preferred
 610                 (stringp (car preferred)))
 611            (mh-mime-display-part preferred)
 612            (mh-mime-maybe-display-alternatives others))
 613           (preferred
 614            (save-restriction
 615              (narrow-to-region (point) (if (eobp) (point) (1+ (point))))
 616              (mh-mime-display-single preferred)
 617              (mh-mime-maybe-display-alternatives others)
 618              (goto-char (point-max))))
 619           (t
 620            (mh-mime-display-mixed handles)))))
 621
 622 (defun mh-mime-maybe-display-alternatives (alternatives)
 623   "Show buttons for ALTERNATIVES.
 624 If `mh-mime-display-alternatives-flag' is non-nil then display
 625 buttons for alternative parts that are usually suppressed."
 626   (when (and mh-display-buttons-for-alternatives-flag alternatives)
 627     (insert "\n----------------------------------------------------\n")
 628     (insert "Alternatives:\n")
 629     (dolist (x alternatives)
 630       (insert "\n")
 631       (mh-insert-mime-button x (mh-mime-part-index x) nil))
 632     (insert "\n----------------------------------------------------\n")))
 633
 634 (defun mh-mime-display-security (handle)
 635   "Display PGP encrypted/signed message, HANDLE."
 636   (save-restriction
 637     (narrow-to-region (point) (point))
 638     (insert "\n")
 639     (mh-insert-mime-security-button handle)
 640     (mh-mime-display-mixed (cdr handle))
 641     (insert "\n")
 642     (let ((mh-mime-security-button-line-format
 643            mh-mime-security-button-end-line-format))
 644       (mh-insert-mime-security-button handle))
 645     (mh-mm-set-handle-multipart-parameter
 646      handle 'mh-region (cons (point-min-marker) (point-max-marker)))))
 647
 648 (defun mh-mime-display-single (handle)
 649   "Display a leaf node, HANDLE in the MIME tree."
 650   (let* ((type (mm-handle-media-type handle))
 651          (small-image-flag (mh-small-image-p handle))
 652          (attachmentp (equal (car (mm-handle-disposition handle))
 653                              "attachment"))
 654          (inlinep (and (equal (car (mm-handle-disposition handle)) "inline")
 655                        (mm-inlinable-p handle)
 656                        (mm-inlined-p handle)))
 657          (displayp (or inlinep                   ; show if inline OR
 658                        (mh-inline-vcard-p handle);      inline vcard OR
 659                        (and (not attachmentp)    ;      if not an attachment
 660                             (or small-image-flag ;        and small image
 661                                                  ;        and user wants inline
 662                                 (and (not (equal
 663                                            (mm-handle-media-supertype handle)
 664                                            "image"))
 665                                      (mm-inlinable-p handle)
 666                                      (mm-inlined-p handle)))))))
 667     (save-restriction
 668       (narrow-to-region (point) (if (eobp) (point) (1+ (point))))
 669       (cond ((and mh-pgp-support-flag
 670                   (equal type "application/pgp-signature"))
 671              nil)             ; skip signatures as they are already handled...
 672             ((not displayp)
 673              (insert "\n")
 674              (mh-insert-mime-button handle (mh-mime-part-index handle) nil))
 675             ((and displayp
 676                   (not mh-display-buttons-for-inline-parts-flag))
 677              (or (mm-display-part handle)
 678                  (mm-display-part handle))
 679              (mh-signature-highlight handle))
 680             ((and displayp
 681                   mh-display-buttons-for-inline-parts-flag)
 682              (insert "\n")
 683              (mh-insert-mime-button handle (mh-mime-part-index handle) nil)
 684              (forward-line -1)
 685              (mh-mm-display-part handle)))
 686       (goto-char (point-max)))))
 687
 688 ;; There is a bug in Gnus inline image display due to which an extra line
 689 ;; gets inserted every time it is viewed. To work around that problem we are
 690 ;; using an extra property 'mh-region to remember the region that is added
 691 ;; when the button is clicked. The region is then deleted to make sure that
 692 ;; no extra lines get inserted.
 693 (defun mh-mm-display-part (handle)
 694   "Toggle display of button for MIME part, HANDLE."
 695   (beginning-of-line)
 696   (let ((id (get-text-property (point) 'mh-part))
 697         (point (point))
 698         (window (selected-window))
 699         (mail-parse-charset 'nil)
 700         (mail-parse-ignored-charsets nil)
 701         region buffer-read-only)
 702     (save-excursion
 703       (unwind-protect
 704           (let ((win (get-buffer-window (current-buffer) t)))
 705             (when win
 706               (select-window win))
 707             (goto-char point)
 708
 709             (if (mm-handle-displayed-p handle)
 710                 ;; This will remove the part.
 711                 (progn
 712                   ;; Delete the button and displayed part (if any)
 713                   (let ((region (get-text-property point 'mh-region)))
 714                     (when region
 715                       (mh-funcall-if-exists
 716                        remove-images (car region) (cdr region)))
 717                     (mm-display-part handle)
 718                     (when region
 719                       (delete-region (car region) (cdr region))))
 720                   ;; Delete button (if it still remains). This happens for
 721                   ;; externally displayed parts where the previous step does
 722                   ;; nothing.
 723                   (unless (eolp)
 724                     (delete-region (point) (progn (forward-line) (point)))))
 725               (save-restriction
 726                 (delete-region (point) (progn (forward-line 1) (point)))
 727                 (narrow-to-region (point) (point))
 728                 ;; Maybe we need another unwind-protect here.
 729                 (when (equal (mm-handle-media-supertype handle) "image")
 730                   (insert "\n"))
 731                 (when (and (not (eq (ignore-errors (mm-display-part handle))
 732                                     'inline))
 733                            (equal (mm-handle-media-supertype handle)
 734                                   "image"))
 735                   (goto-char (point-min))
 736                   (delete-char 1))
 737                 (when (equal (mm-handle-media-supertype handle) "text")
 738                   (when (eq mh-highlight-citation-style 'gnus)
 739                     (mh-gnus-article-highlight-citation))
 740                   (mh-display-smileys)
 741                   (mh-display-emphasis)
 742                   (mh-signature-highlight handle))
 743                 (setq region (cons (progn (goto-char (point-min))
 744                                           (point-marker))
 745                                    (progn (goto-char (point-max))
 746                                           (point-marker)))))))
 747         (when (window-live-p window)
 748           (select-window window))
 749         (goto-char point)
 750         (beginning-of-line)
 751         (mh-insert-mime-button handle id (mm-handle-displayed-p handle))
 752         (goto-char point)
 753         (when region
 754           (add-text-properties (mh-line-beginning-position)
 755                                (mh-line-end-position)
 756                                `(mh-region ,region)))))))
 757
 758 (defun mh-mime-part-index (handle)
 759   "Generate the button number for MIME part, HANDLE.
 760 Notice that a hash table is used to display the same number when
 761 buttons need to be displayed multiple times (for instance when
 762 nested messages are opened)."
 763   (or (gethash handle (mh-mime-part-index-hash (mh-buffer-data)))
 764       (setf (gethash handle (mh-mime-part-index-hash (mh-buffer-data)))
 765             (incf (mh-mime-parts-count (mh-buffer-data))))))
 766
 767 (defun mh-small-image-p (handle)
 768   "Decide whether HANDLE is a \"small\" image that can be displayed inline.
 769 This is only useful if a Content-Disposition header is not present."
 770   (let ((media-test (caddr (assoc (car (mm-handle-type handle))
 771                                   mh-mm-inline-media-tests)))
 772         (mm-inline-large-images t))
 773     (and media-test
 774          (equal (mm-handle-media-supertype handle) "image")
 775          (funcall media-test handle) ; Since mm-inline-large-images is T,
 776                                         ; this only tells us if the image is
 777                                         ; something that emacs can display
 778          (let* ((image (mm-get-image handle)))
 779            (or (mh-do-in-xemacs
 780                  (and (mh-funcall-if-exists glyphp image)
 781                       (< (glyph-width image)
 782                          (or mh-max-inline-image-width (window-pixel-width)))
 783                       (< (glyph-height image)
 784                          (or mh-max-inline-image-height
 785                              (window-pixel-height)))))
 786                (mh-do-in-gnu-emacs
 787                  (let ((size (mh-funcall-if-exists image-size image)))
 788                    (and size
 789                         (< (cdr size) (or mh-max-inline-image-height
 790                                           (1- (window-height))))
 791                         (< (car size) (or mh-max-inline-image-width
 792                                           (window-width)))))))))))
 793
 794 (defun mh-inline-vcard-p (handle)
 795   "Decide if HANDLE is a vcard that must be displayed inline."
 796   (let ((type (mm-handle-type handle)))
 797     (and (or (featurep 'vcard) (fboundp 'vcard-pretty-print))
 798          (consp type)
 799          (equal (car type) "text/x-vcard")
 800          (save-excursion
 801            (save-restriction
 802              (widen)
 803              (goto-char (point-min))
 804              (not (mh-signature-separator-p)))))))
 805
 806 (defun mh-signature-highlight (&optional handle)
 807   "Highlight message signature in HANDLE.
 808 The optional argument, HANDLE is a MIME handle if the function is
 809 being used to highlight the signature in a MIME part."
 810   (let ((regexp
 811          (cond ((not handle) "^-- $")
 812                ((not (and (equal (mm-handle-media-supertype handle) "text")
 813                           (equal (mm-handle-media-subtype handle) "html")))
 814                 "^-- $")
 815                ((eq (mh-mm-text-html-renderer) 'lynx) "^   --$")
 816                (t "^--$"))))
 817     (save-excursion
 818       (goto-char (point-max))
 819       (when (re-search-backward regexp nil t)
 820         (mh-do-in-gnu-emacs
 821           (let ((ov (make-overlay (point) (point-max))))
 822             (overlay-put ov 'face 'mh-show-signature)
 823             (overlay-put ov 'evaporate t)))
 824         (mh-do-in-xemacs
 825           (set-extent-property (make-extent (point) (point-max))
 826                                'face 'mh-show-signature))))))
 827
 828 \f
 829
 830 ;;; Button Display
 831
 832 ;; Shush compiler.
 833 (defvar dots)                           ; XEmacs
 834 (defvar type)                           ; XEmacs
 835 (defvar ov)                             ; XEmacs
 836
 837 (defun mh-insert-mime-button (handle index displayed)
 838   "Insert MIME button for HANDLE.
 839 INDEX is the part number that will be DISPLAYED. It is also used
 840 by commands like \"K v\" which operate on individual MIME parts."
 841   ;; The button could be displayed by a previous decode. In that case
 842   ;; undisplay it if we need a hidden button.
 843   (when (and (mm-handle-displayed-p handle) (not displayed))
 844     (mm-display-part handle))
 845   (let ((name (or (mail-content-type-get (mm-handle-type handle) 'name)
 846                   (mail-content-type-get (mm-handle-disposition handle)
 847                                          'filename)
 848                   (mail-content-type-get (mm-handle-type handle) 'url)
 849                   ""))
 850         (type (mm-handle-media-type handle))
 851         (description (mail-decode-encoded-word-string
 852                       (or (mm-handle-description handle) "")))
 853         (dots (if (or displayed (mm-handle-displayed-p handle)) "   " "..."))
 854         long-type begin end)
 855     (if (string-match ".*/" name) (setq name (substring name (match-end 0))))
 856     (setq long-type (concat type (and (not (equal name ""))
 857                                       (concat "; " name))))
 858     (unless (equal description "")
 859       (setq long-type (concat " --- " long-type)))
 860     (unless (bolp) (insert "\n"))
 861     (setq begin (point))
 862     (gnus-eval-format
 863      mh-mime-button-line-format mh-mime-button-line-format-alist
 864      `(,@(mh-gnus-local-map-property mh-mime-button-map)
 865          mh-callback mh-mm-display-part
 866          mh-part ,index
 867          mh-data ,handle))
 868     (setq end (point))
 869     (widget-convert-button
 870      'link begin end
 871      :mime-handle handle
 872      :action 'mh-widget-press-button
 873      :button-keymap mh-mime-button-map
 874      :help-echo
 875      "Mouse-2 click or press RET (in show buffer) to toggle display")
 876     (dolist (ov (mh-funcall-if-exists overlays-in begin end))
 877       (mh-funcall-if-exists overlay-put ov 'evaporate t))))
 878
 879 ;; Shush compiler.
 880 (defvar mm-verify-function-alist)       ; < Emacs 22
 881 (defvar mm-decrypt-function-alist)      ; < Emacs 22
 882 (defvar pressed-details)                ; XEmacs
 883
 884 (defun mh-insert-mime-security-button (handle)
 885   "Display buttons for PGP message, HANDLE."
 886   (let* ((protocol (mh-mm-handle-multipart-ctl-parameter handle 'protocol))
 887          (crypto-type (or (nth 2 (assoc protocol mm-verify-function-alist))
 888                           (nth 2 (assoc protocol mm-decrypt-function-alist))
 889                           "Unknown"))
 890          (type (concat crypto-type
 891                        (if (equal (car handle) "multipart/signed")
 892                            " Signed" " Encrypted")
 893                        " Part"))
 894          (info (or (mh-mm-handle-multipart-ctl-parameter handle 'gnus-info)
 895                    "Undecided"))
 896          (details (mh-mm-handle-multipart-ctl-parameter handle 'gnus-details))
 897          pressed-details begin end face)
 898     (setq details (if details (concat "\n" details) ""))
 899     (setq pressed-details (if mh-mime-security-button-pressed details ""))
 900     (setq face (mh-mime-security-button-face info))
 901     (unless (bolp) (insert "\n"))
 902     (setq begin (point))
 903     (gnus-eval-format
 904      mh-mime-security-button-line-format
 905      mh-mime-security-button-line-format-alist
 906      `(,@(mh-gnus-local-map-property mh-mime-security-button-map)
 907          mh-button-pressed ,mh-mime-security-button-pressed
 908          mh-callback mh-mime-security-press-button
 909          mh-line-format ,mh-mime-security-button-line-format
 910          mh-data ,handle))
 911     (setq end (point))
 912     (widget-convert-button 'link begin end
 913                            :mime-handle handle
 914                            :action 'mh-widget-press-button
 915                            :button-keymap mh-mime-security-button-map
 916                            :button-face face
 917                            :help-echo "Mouse-2 click or press RET (in show buffer) to see security details.")
 918     (dolist (ov (mh-funcall-if-exists overlays-in begin end))
 919       (mh-funcall-if-exists overlay-put ov 'evaporate t))
 920     (when (equal info "Failed")
 921       (let* ((type (if (equal (car handle) "multipart/signed")
 922                        "verification" "decryption"))
 923              (warning (if (equal type "decryption")
 924                           "(passphrase may be incorrect)" "")))
 925         (message "%s %s failed %s" crypto-type type warning)))))
 926
 927 (defun mh-mime-security-button-face (info)
 928   "Return the button face to use for encrypted/signed mail based on INFO."
 929   (cond ((string-match "OK" info)       ;Decrypted mail
 930          'mh-show-pgg-good)
 931         ((string-match "Failed" info)   ;Decryption failed or signature invalid
 932          'mh-show-pgg-bad)
 933         ((string-match "Undecided" info);Unprocessed mail
 934          'mh-show-pgg-unknown)
 935         ((string-match "Untrusted" info);Key not trusted
 936          'mh-show-pgg-unknown)
 937         (t
 938          'mh-show-pgg-good)))
 939
 940 \f
 941
 942 ;;; Button Handlers
 943
 944 (defun mh-folder-mime-action (part-index action include-security-flag)
 945   "Go to PART-INDEX and carry out ACTION.
 946
 947 If PART-INDEX is nil then go to the next part in the buffer. The
 948 search for the next buffer wraps around if end of buffer is reached.
 949 If argument INCLUDE-SECURITY-FLAG is non-nil then include security
 950 info buttons when searching for a suitable parts."
 951   (unless mh-showing-mode
 952     (mh-show))
 953   (mh-in-show-buffer (mh-show-buffer)
 954     (let ((criterion
 955            (cond (part-index
 956                   (lambda (p)
 957                     (let ((part (get-text-property p 'mh-part)))
 958                       (and (integerp part) (= part part-index)))))
 959                  (t (lambda (p)
 960                       (if include-security-flag
 961                           (get-text-property p 'mh-data)
 962                         (integerp (get-text-property p 'mh-part)))))))
 963           (point (point)))
 964       (cond ((and (get-text-property point 'mh-part)
 965                   (or (null part-index)
 966                       (= (get-text-property point 'mh-part) part-index)))
 967              (funcall action))
 968             ((and (get-text-property point 'mh-data)
 969                   include-security-flag
 970                   (null part-index))
 971              (funcall action))
 972             (t
 973              (mh-goto-next-button nil criterion)
 974              (if (= (point) point)
 975                  (message "No matching MIME part found")
 976                (funcall action)))))))
 977
 978 ;;;###mh-autoload
 979 (defun mh-goto-next-button (backward-flag &optional criterion)
 980   "Search for next button satisfying criterion.
 981
 982 If BACKWARD-FLAG is non-nil search backward in the buffer for a mime
 983 button.
 984 If CRITERION is a function or a symbol which has a function binding
 985 then that function must return non-nil at the button we stop."
 986   (unless (or (and (symbolp criterion) (fboundp criterion))
 987               (functionp criterion))
 988     (setq criterion (lambda (x) t)))
 989   ;; Move to the next button in the buffer satisfying criterion
 990   (goto-char (or (save-excursion
 991                    (beginning-of-line)
 992                    ;; Find point before current button
 993                    (let ((point-before-current-button
 994                           (save-excursion
 995                             (while (get-text-property (point) 'mh-data)
 996                               (unless (= (forward-line
 997                                           (if backward-flag 1 -1))
 998                                          0)
 999                                 (if backward-flag
1000                                     (goto-char (point-min))
1001                                   (goto-char (point-max)))))
1002                             (point))))
1003                      ;; Skip over current button
1004                      (while (and (get-text-property (point) 'mh-data)
1005                                  (not (if backward-flag (bobp) (eobp))))
1006                        (forward-line (if backward-flag -1 1)))
1007                      ;; Stop at next MIME button if any exists.
1008                      (block loop
1009                        (while (/= (progn
1010                                     (unless (= (forward-line
1011                                                 (if backward-flag -1 1))
1012                                                0)
1013                                       (if backward-flag
1014                                           (goto-char (point-max))
1015                                         (goto-char (point-min)))
1016                                       (beginning-of-line))
1017                                     (point))
1018                                   point-before-current-button)
1019                          (when (and (get-text-property (point) 'mh-data)
1020                                     (funcall criterion (point)))
1021                            (return-from loop (point))))
1022                        nil)))
1023                  (point))))
1024
1025 (defun mh-widget-press-button (widget el)
1026   "Callback for widget, WIDGET.
1027 Parameter EL is unused."
1028   (goto-char (widget-get widget :from))
1029   (mh-press-button))
1030
1031 (defun mh-press-button ()
1032   "View contents of button.
1033
1034 This command is a toggle so if you use it again on the same
1035 attachment, the attachment is hidden."
1036   (interactive)
1037   (let ((mm-inline-media-tests mh-mm-inline-media-tests)
1038         (data (get-text-property (point) 'mh-data))
1039         (function (get-text-property (point) 'mh-callback))
1040         (buffer-read-only nil)
1041         (folder mh-show-folder-buffer))
1042     (flet ((mm-handle-set-external-undisplayer
1043             (handle function)
1044             (mh-handle-set-external-undisplayer folder handle function)))
1045       (when (and function (eolp))
1046         (backward-char))
1047       (unwind-protect (and function (funcall function data))
1048         (set-buffer-modified-p nil)))))
1049
1050 (defun mh-push-button (event)
1051   "Click MIME button for EVENT.
1052
1053 If the MIME part is visible then it is removed. Otherwise the
1054 part is displayed. This function is called when the mouse is used
1055 to click the MIME button."
1056   (interactive "e")
1057   (mh-do-at-event-location event
1058     (let ((folder mh-show-folder-buffer)
1059           (mm-inline-media-tests mh-mm-inline-media-tests)
1060           (data (get-text-property (point) 'mh-data))
1061           (function (get-text-property (point) 'mh-callback)))
1062       (flet ((mm-handle-set-external-undisplayer (handle func)
1063                (mh-handle-set-external-undisplayer folder handle func)))
1064         (and function (funcall function data))))))
1065
1066 (defun mh-handle-set-external-undisplayer (folder handle function)
1067   "Replacement for `mm-handle-set-external-undisplayer'.
1068
1069 This is only called in recent versions of Gnus. The MIME handles
1070 are stored in data structures corresponding to MH-E folder buffer
1071 FOLDER instead of in Gnus (as in the original). The MIME part,
1072 HANDLE is associated with the undisplayer FUNCTION."
1073   (if (mh-mm-keep-viewer-alive-p handle)
1074       (let ((new-handle (copy-sequence handle)))
1075         (mm-handle-set-undisplayer new-handle function)
1076         (mm-handle-set-undisplayer handle nil)
1077         (save-excursion
1078           (set-buffer folder)
1079           (push new-handle (mh-mime-handles (mh-buffer-data)))))
1080     (mm-handle-set-undisplayer handle function)))
1081
1082 (defun mh-mime-security-press-button (handle)
1083   "Callback from security button for part HANDLE."
1084   (if (mh-mm-handle-multipart-ctl-parameter handle 'gnus-info)
1085       (mh-mime-security-show-details handle)
1086     (let ((region (mh-mm-handle-multipart-ctl-parameter handle 'mh-region))
1087           point)
1088       (setq point (point))
1089       (goto-char (car region))
1090       (delete-region (car region) (cdr region))
1091       (with-current-buffer (mh-mm-handle-multipart-ctl-parameter handle 'buffer)
1092         (let* ((mm-verify-option 'known)
1093                (mm-decrypt-option 'known)
1094                (new (mh-mm-possibly-verify-or-decrypt (cdr handle) handle)))
1095           (unless (eq new (cdr handle))
1096             (mh-mm-destroy-parts (cdr handle))
1097             (setcdr handle new))))
1098       (mh-mime-display-security handle)
1099       (goto-char point))))
1100
1101 ;; I rewrote the security part because Gnus doesn't seem to ever minimize
1102 ;; the button. That is once the mime-security button is pressed there seems
1103 ;; to be no way of getting rid of the inserted text.
1104 (defun mh-mime-security-show-details (handle)
1105   "Toggle display of detailed security info for HANDLE."
1106   (let ((details (mh-mm-handle-multipart-ctl-parameter handle 'gnus-details)))
1107     (when details
1108       (let ((mh-mime-security-button-pressed
1109              (not (get-text-property (point) 'mh-button-pressed)))
1110             (mh-mime-security-button-line-format
1111              (get-text-property (point) 'mh-line-format)))
1112         (forward-char -1)
1113         (while (eq (get-text-property (point) 'mh-line-format)
1114                    mh-mime-security-button-line-format)
1115           (forward-char -1))
1116         (forward-char)
1117         (save-restriction
1118           (narrow-to-region (point) (point))
1119           (mh-insert-mime-security-button handle))
1120         (delete-region
1121          (point)
1122          (or (text-property-not-all
1123               (point) (point-max)
1124               'mh-line-format mh-mime-security-button-line-format)
1125              (point-max)))
1126         (forward-line -1)))))
1127
1128 \f
1129
1130 ;;; Miscellaneous Article Washing
1131
1132 ;;;###mh-autoload
1133 (defun mh-add-missing-mime-version-header ()
1134   "Some mail programs don't put a MIME-Version header.
1135 I have seen this only in spam, so maybe we shouldn't fix
1136 this ;-)"
1137   (save-excursion
1138     (goto-char (point-min))
1139     (re-search-forward "\n\n" nil t)
1140     (save-restriction
1141       (narrow-to-region (point-min) (point))
1142       (when (and (message-fetch-field "content-type")
1143                  (not (message-fetch-field "mime-version")))
1144         (goto-char (point-min))
1145         (insert "MIME-Version: 1.0\n")))))
1146
1147 ;;;###mh-autoload
1148 (defun mh-display-smileys ()
1149   "Display smileys."
1150   (when (and mh-graphical-smileys-flag (mh-small-show-buffer-p))
1151     (mh-funcall-if-exists smiley-region (point-min) (point-max))))
1152
1153 ;;;###mh-autoload
1154 (defun mh-display-emphasis ()
1155   "Display graphical emphasis."
1156   (when (and mh-graphical-emphasis-flag (mh-small-show-buffer-p))
1157     (flet ((article-goto-body ()))      ; shadow this function to do nothing
1158       (save-excursion
1159         (goto-char (point-min))
1160         (article-emphasize)))))
1161
1162 (defun mh-small-show-buffer-p ()
1163   "Check if show buffer is small.
1164 This is used to decide if smileys and graphical emphasis should be
1165 displayed."
1166   (let ((max nil))
1167     (when (and (boundp 'font-lock-maximum-size) font-lock-maximum-size)
1168       (cond ((numberp font-lock-maximum-size)
1169              (setq max font-lock-maximum-size))
1170             ((listp font-lock-maximum-size)
1171              (setq max (cdr (or (assoc 'mh-show-mode font-lock-maximum-size)
1172                                 (assoc t font-lock-maximum-size)))))))
1173     (or (not (numberp max)) (>= (/ max 8) (buffer-size)))))
1174
1175 \f
1176
1177 ;;; MH-Letter Commands
1178
1179 ;; MH-E commands are alphabetical; specific support routines follow command.
1180
1181 ;;;###mh-autoload
1182 (defun mh-compose-forward (&optional description folder range)
1183   "Add tag to forward a message.
1184
1185 You are prompted for a content DESCRIPTION, the name of the
1186 FOLDER in which the messages to forward are located, and a RANGE
1187 of messages, which defaults to the current message in that
1188 folder. Check the documentation of `mh-interactive-range' to see
1189 how RANGE is read in interactive use.
1190
1191 The option `mh-compose-insertion' controls what type of tags are inserted."
1192   (interactive
1193    (let* ((description
1194            (mml-minibuffer-read-description))
1195           (folder
1196            (mh-prompt-for-folder "Message from"
1197                                  mh-sent-from-folder nil))
1198           (default
1199             (if (and (equal folder mh-sent-from-folder)
1200                      (numberp mh-sent-from-msg))
1201                 mh-sent-from-msg
1202               (nth 0 (mh-translate-range folder "cur"))))
1203           (range
1204            (mh-read-range "Forward" folder
1205                           (or (and default
1206                                    (number-to-string default))
1207                               t)
1208                           t t)))
1209      (list description folder range)))
1210   (let ((messages (mapconcat 'identity (mh-list-to-string range) " ")))
1211     (dolist (message (mh-translate-range folder messages))
1212       (if (equal mh-compose-insertion 'mml)
1213           (mh-mml-forward-message description folder (format "%s" message))
1214         (mh-mh-forward-message description folder (format "%s" message))))))
1215
1216 ;;;###mh-autoload
1217 (defun mh-mml-forward-message (description folder message)
1218   "Forward a message as attachment.
1219
1220 The function will prompt the user for a DESCRIPTION, a FOLDER and
1221 MESSAGE number."
1222   (let ((msg (if (and (equal message "") (numberp mh-sent-from-msg))
1223                  mh-sent-from-msg
1224                (string-to-number message))))
1225     (cond ((integerp msg)
1226            (mml-attach-file (format "%s%s/%d"
1227                                     mh-user-path (substring folder 1) msg)
1228                             "message/rfc822"
1229                             (if (string= "" description) nil description)
1230                             "inline"))
1231           (t (error "The message number, %s, is not a integer" msg)))))
1232
1233 (defun mh-mh-forward-message (&optional description folder messages)
1234   "Add tag to forward a message.
1235 You are prompted for a content DESCRIPTION, the name of the
1236 FOLDER in which the messages to forward are located, and the
1237 MESSAGES' numbers.
1238
1239 See also \\[mh-mh-to-mime]."
1240   (interactive (list
1241                 (mml-minibuffer-read-description)
1242                 (mh-prompt-for-folder "Message from" mh-sent-from-folder nil)
1243                 (read-string (concat "Messages"
1244                                      (if (numberp mh-sent-from-msg)
1245                                          (format " (default %d): "
1246                                                  mh-sent-from-msg)
1247                                        ": ")))))
1248   (beginning-of-line)
1249   (insert "#forw [")
1250   (and description
1251        (not (string= description ""))
1252        (insert description))
1253   (insert "]")
1254   (and folder
1255        (not (string= folder ""))
1256        (insert " " folder))
1257   (if (and messages
1258            (not (string= messages "")))
1259       (let ((start (point)))
1260         (insert " " messages)
1261         (subst-char-in-region start (point) ?, ? ))
1262     (if (numberp mh-sent-from-msg)
1263         (insert " " (int-to-string mh-sent-from-msg))))
1264   (insert "\n"))
1265
1266 ;;;###mh-autoload
1267 (defun mh-compose-insertion (&optional inline)
1268   "Add tag to include a file such as an image or sound.
1269
1270 You are prompted for the filename containing the object, the
1271 media type if it cannot be determined automatically, and a
1272 content description. If you're using MH-style directives, you
1273 will also be prompted for additional attributes.
1274
1275 The option `mh-compose-insertion' controls what type of tags are
1276 inserted. Optional argument INLINE means make it an inline
1277 attachment."
1278   (interactive "P")
1279   (if (equal mh-compose-insertion 'mml)
1280       (if inline
1281           (mh-mml-attach-file "inline")
1282         (mh-mml-attach-file))
1283     (call-interactively 'mh-mh-attach-file)))
1284
1285 (defun mh-mml-attach-file (&optional disposition)
1286   "Add a tag to insert a MIME message part from a file.
1287
1288 You are prompted for the filename containing the object, the
1289 media type if it cannot be determined automatically, a content
1290 description and the DISPOSITION of the attachment.
1291
1292 This is basically `mml-attach-file' from Gnus, modified such that a prefix
1293 argument yields an \"inline\" disposition and Content-Type is determined
1294 automatically."
1295   (let* ((file (mml-minibuffer-read-file "Attach file: "))
1296          (type (mh-minibuffer-read-type file))
1297          (description (mml-minibuffer-read-description))
1298          (dispos (or disposition
1299                      (mh-mml-minibuffer-read-disposition type))))
1300     (mml-insert-empty-tag 'part 'type type 'filename file
1301                           'disposition dispos 'description description)))
1302
1303 (defun mh-mh-attach-file (filename type description attributes)
1304   "Add a tag to insert a MIME message part from a file.
1305 You are prompted for the FILENAME containing the object, the
1306 media TYPE if it cannot be determined automatically, and a
1307 content DESCRIPTION. In addition, you are also prompted for
1308 additional ATTRIBUTES.
1309
1310 See also \\[mh-mh-to-mime]."
1311   (interactive (let ((filename (mml-minibuffer-read-file "Attach file: ")))
1312                  (list
1313                   filename
1314                   (mh-minibuffer-read-type filename)
1315                   (mml-minibuffer-read-description)
1316                   (read-string "Attributes: "
1317                                (concat "name=\""
1318                                        (file-name-nondirectory filename)
1319                                        "\"")))))
1320   (mh-mh-compose-type filename type description attributes))
1321
1322 (defun mh-mh-compose-type (filename type
1323                                      &optional description attributes comment)
1324   "Insert an MH-style directive to insert a file.
1325 The file specified by FILENAME is encoded as TYPE. An optional
1326 DESCRIPTION is used as the Content-Description field, optional
1327 set of ATTRIBUTES and an optional COMMENT can also be included."
1328   (beginning-of-line)
1329   (insert "#" type)
1330   (and attributes
1331        (insert "; " attributes))
1332   (and comment
1333        (insert " (" comment ")"))
1334   (insert " [")
1335   (and description
1336        (insert description))
1337   (insert "] " (expand-file-name filename))
1338   (insert "\n"))
1339
1340 ;;;###mh-autoload
1341 (defun mh-mh-compose-anon-ftp (host filename type description)
1342   "Add tag to include anonymous ftp reference to a file.
1343
1344 You can have your message initiate an \"ftp\" transfer when the
1345 recipient reads the message. You are prompted for the remote HOST
1346 and FILENAME, the media TYPE, and the content DESCRIPTION.
1347
1348 See also \\[mh-mh-to-mime]."
1349   (interactive (list
1350                 (read-string "Remote host: ")
1351                 (read-string "Remote filename: ")
1352                 (mh-minibuffer-read-type "DUMMY-FILENAME")
1353                 (mml-minibuffer-read-description)))
1354   (mh-mh-compose-external-type "anon-ftp" host filename
1355                                type description))
1356
1357 ;;;###mh-autoload
1358 (defun mh-mh-compose-external-compressed-tar (host filename description)
1359   "Add tag to include anonymous ftp reference to a compressed tar file.
1360
1361 In addition to retrieving the file via anonymous \"ftp\" as per
1362 the command \\[mh-mh-compose-anon-ftp], the file will also be
1363 uncompressed and untarred. You are prompted for the remote HOST
1364 and FILENAME and the content DESCRIPTION.
1365
1366 See also \\[mh-mh-to-mime]."
1367   (interactive (list
1368                 (read-string "Remote host: ")
1369                 (read-string "Remote filename: ")
1370                 (mml-minibuffer-read-description)))
1371   (mh-mh-compose-external-type "anon-ftp" host filename
1372                                "application/octet-stream"
1373                                description
1374                                "type=tar; conversions=x-compress"
1375                                "mode=image"))
1376
1377 ;; RFC 2045 - Multipurpose Internet Mail Extensions (MIME) Part One:
1378 ;;            Format of Internet Message Bodies.
1379 ;; RFC 2046 - Multipurpose Internet Mail Extensions (MIME) Part Two:
1380 ;;            Media Types.
1381 ;; RFC 2049 - Multipurpose Internet Mail Extensions (MIME) Part Five:
1382 ;;            Conformance Criteria and Examples.
1383 ;; RFC 2017 - Definition of the URL MIME External-Body Access-Type
1384 ;; RFC 1738 - Uniform Resource Locators (URL)
1385 (defvar mh-access-types
1386   '(("anon-ftp")        ; RFC2046 Anonymous File Transfer Protocol
1387     ("file")            ; RFC1738 Host-specific file names
1388     ("ftp")             ; RFC2046 File Transfer Protocol
1389     ("gopher")          ; RFC1738 The Gopher Protocol
1390     ("http")            ; RFC1738 Hypertext Transfer Protocol
1391     ("local-file")      ; RFC2046 Local file access
1392     ("mail-server")     ; RFC2046 mail-server Electronic mail address
1393     ("mailto")          ; RFC1738 Electronic mail address
1394     ("news")            ; RFC1738 Usenet news
1395     ("nntp")            ; RFC1738 Usenet news using NNTP access
1396     ("propspero")       ; RFC1738 Prospero Directory Service
1397     ("telnet")          ; RFC1738 Telnet
1398     ("tftp")            ; RFC2046 Trivial File Transfer Protocol
1399     ("url")             ; RFC2017 URL scheme MIME access-type Protocol
1400     ("wais"))           ; RFC1738 Wide Area Information Servers
1401   "Valid MIME access-type values.")
1402
1403 ;;;###mh-autoload
1404 (defun mh-mh-compose-external-type (access-type host filename type
1405                                                 &optional description
1406                                                 attributes parameters
1407                                                 comment)
1408   "Add tag to refer to a remote file.
1409
1410 This command is a general utility for referencing external files.
1411 In fact, all of the other commands that insert directives to
1412 access external files call this command. You are prompted for the
1413 ACCESS-TYPE, remote HOST and FILENAME, and content TYPE. If you
1414 provide a prefix argument, you are also prompted for a content
1415 DESCRIPTION, ATTRIBUTES, PARAMETERS, and a COMMENT.
1416
1417 See also \\[mh-mh-to-mime]."
1418   (interactive (list
1419                 (completing-read "Access type: " mh-access-types)
1420                 (read-string "Remote host: ")
1421                 (read-string "Remote filename: ")
1422                 (mh-minibuffer-read-type "DUMMY-FILENAME")
1423                 (if current-prefix-arg (mml-minibuffer-read-description))
1424                 (if current-prefix-arg (read-string "Attributes: "))
1425                 (if current-prefix-arg (read-string "Parameters: "))
1426                 (if current-prefix-arg (read-string "Comment: "))))
1427   (beginning-of-line)
1428   (insert "#@" type)
1429   (and attributes
1430        (insert "; " attributes))
1431   (and comment
1432        (insert " (" comment ") "))
1433   (insert " [")
1434   (and description
1435        (insert description))
1436   (insert "] ")
1437   (insert "access-type=" access-type "; ")
1438   (insert "site=" host)
1439   (insert "; name=" (file-name-nondirectory filename))
1440   (let ((directory (file-name-directory filename)))
1441     (and directory
1442          (insert "; directory=\"" directory "\"")))
1443   (and parameters
1444        (insert "; " parameters))
1445   (insert "\n"))
1446
1447 (defvar mh-mh-to-mime-args nil
1448   "Extra arguments for \\[mh-mh-to-mime] to pass to the \"mhbuild\" command.
1449 The arguments are passed to \"mhbuild\" if \\[mh-mh-to-mime] is
1450 given a prefix argument. Normally default arguments to
1451 \"mhbuild\" are specified in the MH profile.")
1452
1453 ;;;###mh-autoload
1454 (defun mh-mh-to-mime (&optional extra-args)
1455   "Compose MIME message from MH-style directives.
1456
1457 Typically, you send a message with attachments just like any other
1458 message. However, you may take a sneak preview of the MIME encoding if
1459 you wish by running this command.
1460
1461 If you wish to pass additional arguments to \"mhbuild\" (\"mhn\")
1462 to affect how it builds your message, use the option
1463 `mh-mh-to-mime-args'. For example, you can build a consistency
1464 check into the message by setting `mh-mh-to-mime-args' to
1465 \"-check\". The recipient of your message can then run \"mhbuild
1466 -check\" on the message--\"mhbuild\" (\"mhn\") will complain if
1467 the message has been corrupted on the way. This command only
1468 consults this option when given a prefix argument EXTRA-ARGS.
1469
1470 The hook `mh-mh-to-mime-hook' is called after the message has been
1471 formatted.
1472
1473 The effects of this command can be undone by running
1474 \\[mh-mh-to-mime-undo]."
1475   (interactive "*P")
1476   (mh-mh-quote-unescaped-sharp)
1477   (save-buffer)
1478   (message "Running %s..." (if (mh-variant-p 'nmh) "mhbuild" "mhn"))
1479   (cond
1480    ((mh-variant-p 'nmh)
1481     (mh-exec-cmd-error nil
1482                        "mhbuild"
1483                        (if extra-args mh-mh-to-mime-args)
1484                        buffer-file-name))
1485    (t
1486     (mh-exec-cmd-error (format "mhdraft=%s" buffer-file-name)
1487                        "mhn"
1488                        (if extra-args mh-mh-to-mime-args)
1489                        buffer-file-name)))
1490   (revert-buffer t t)
1491   (message "Running %s...done" (if (mh-variant-p 'nmh) "mhbuild" "mhn"))
1492   (run-hooks 'mh-mh-to-mime-hook))
1493
1494 (defun mh-mh-quote-unescaped-sharp ()
1495   "Quote \"#\" characters that haven't been quoted for \"mhbuild\".
1496 If the \"#\" character is present in the first column, but it isn't
1497 part of a MH-style directive then \"mhbuild\" gives an error.
1498 This function will quote all such characters."
1499   (save-excursion
1500     (goto-char (point-min))
1501     (while (re-search-forward "^#" nil t)
1502       (beginning-of-line)
1503       (unless (mh-mh-directive-present-p (point) (mh-line-end-position))
1504         (insert "#"))
1505       (goto-char (mh-line-end-position)))))
1506
1507 ;;;###mh-autoload
1508 (defun mh-mh-to-mime-undo (noconfirm)
1509   "Undo effects of \\[mh-mh-to-mime].
1510
1511 It does this by reverting to a backup file. You are prompted to
1512 confirm this action, but you can avoid the confirmation by adding
1513 a prefix argument NOCONFIRM."
1514   (interactive "*P")
1515   (if (null buffer-file-name)
1516       (error "Buffer does not seem to be associated with any file"))
1517   (let ((backup-strings '("," "#"))
1518         backup-file)
1519     (while (and backup-strings
1520                 (not (file-exists-p
1521                       (setq backup-file
1522                             (concat (file-name-directory buffer-file-name)
1523                                     (car backup-strings)
1524                                     (file-name-nondirectory buffer-file-name)
1525                                     ".orig")))))
1526       (setq backup-strings (cdr backup-strings)))
1527     (or backup-strings
1528         (error "Backup file for %s no longer exists" buffer-file-name))
1529     (or noconfirm
1530         (yes-or-no-p (format "Revert buffer from file %s? "
1531                              backup-file))
1532         (error "Revert not confirmed"))
1533     (let ((buffer-read-only nil))
1534       (erase-buffer)
1535       (insert-file-contents backup-file))
1536     (after-find-file nil)))
1537
1538 ;; Shush compiler.
1539 (defvar mh-identity-pgg-default-user-id)
1540
1541 ;;;###mh-autoload
1542 (defun mh-mml-secure-message-encrypt (method)
1543   "Add tag to encrypt the message.
1544
1545 A proper multipart message is created for you when you send the
1546 message. Use the command \\[mh-mml-unsecure-message] to remove
1547 this tag. Use a prefix argument METHOD to be prompted for one of
1548 the possible security methods (see `mh-mml-method-default')."
1549   (interactive (list (mh-mml-query-cryptographic-method)))
1550   (mh-secure-message method "encrypt" mh-identity-pgg-default-user-id))
1551
1552 ;;;###mh-autoload
1553 (defun mh-mml-secure-message-sign (method)
1554   "Add tag to sign the message.
1555
1556 A proper multipart message is created for you when you send the
1557 message. Use the command \\[mh-mml-unsecure-message] to remove
1558 this tag. Use a prefix argument METHOD to be prompted for one of
1559 the possible security methods (see `mh-mml-method-default')."
1560   (interactive (list (mh-mml-query-cryptographic-method)))
1561   (mh-secure-message method "sign" mh-identity-pgg-default-user-id))
1562
1563 ;;;###mh-autoload
1564 (defun mh-mml-secure-message-signencrypt (method)
1565   "Add tag to encrypt and sign the message.
1566
1567 A proper multipart message is created for you when you send the
1568 message. Use the command \\[mh-mml-unsecure-message] to remove
1569 this tag. Use a prefix argument METHOD to be prompted for one of
1570 the possible security methods (see `mh-mml-method-default')."
1571   (interactive (list (mh-mml-query-cryptographic-method)))
1572   (mh-secure-message method "signencrypt" mh-identity-pgg-default-user-id))
1573
1574 (defvar mh-mml-cryptographic-method-history ())
1575
1576 (defun mh-mml-query-cryptographic-method ()
1577   "Read the cryptographic method to use."
1578   (if current-prefix-arg
1579       (let ((def (or (car mh-mml-cryptographic-method-history)
1580                      mh-mml-method-default)))
1581         (completing-read (format "Method (default %s): " def)
1582                          '(("pgp") ("pgpmime") ("smime"))
1583                          nil t nil 'mh-mml-cryptographic-method-history def))
1584     mh-mml-method-default))
1585
1586 (defun mh-secure-message (method mode &optional identity)
1587   "Add tag to encrypt or sign message.
1588
1589 METHOD should be one of: \"pgpmime\", \"pgp\", \"smime\".
1590 MODE should be one of: \"sign\", \"encrypt\", \"signencrypt\", \"none\".
1591 IDENTITY is optionally the default-user-id to use."
1592   (if (not mh-pgp-support-flag)
1593       (error "Your version of Gnus does not support PGP/GPG")
1594     ;; Check the arguments
1595     (let ((valid-methods (list "pgpmime" "pgp" "smime"))
1596           (valid-modes (list "sign" "encrypt" "signencrypt" "none")))
1597       (if (not (member method valid-methods))
1598           (error "Method %s is invalid" method))
1599       (if (not (member mode valid-modes))
1600           (error "Mode %s is invalid" mode))
1601       (mml-unsecure-message)
1602       (if (not (string= mode "none"))
1603         (save-excursion
1604           (goto-char (point-min))
1605           (mh-goto-header-end 1)
1606           (if mh-identity-pgg-default-user-id
1607               (mml-insert-tag 'secure 'method method 'mode mode
1608                               'sender mh-identity-pgg-default-user-id)
1609             (mml-insert-tag 'secure 'method method 'mode mode)))))))
1610
1611 ;;;###mh-autoload
1612 (defun mh-mml-to-mime ()
1613   "Compose MIME message from MML tags.
1614
1615 Typically, you send a message with attachments just like any
1616 other message. However, you may take a sneak preview of the MIME
1617 encoding if you wish by running this command.
1618
1619 This action can be undone by running \\[undo]."
1620   (interactive)
1621   (require 'message)
1622   (when mh-pgp-support-flag
1623     ;; PGP requires actual e-mail addresses, not aliases.
1624     ;; Parse the recipients and sender from the message
1625     (message-options-set-recipient)
1626     ;; Do an alias lookup on sender
1627     (message-options-set 'message-sender
1628                      (mail-strip-quoted-names
1629                       (mh-alias-expand
1630                        (message-options-get 'message-sender))))
1631     ;; Do an alias lookup on recipients
1632     (message-options-set 'message-recipients
1633                          (mapconcat
1634                           '(lambda (ali)
1635                              (mail-strip-quoted-names (mh-alias-expand ali)))
1636                           (split-string (message-options-get 'message-recipients) "[, ]+")
1637                           ", ")))
1638   (let ((saved-text (buffer-string))
1639         (buffer (current-buffer))
1640         (modified-flag (buffer-modified-p)))
1641     (condition-case err (mml-to-mime)
1642       (error
1643        (with-current-buffer buffer
1644          (delete-region (point-min) (point-max))
1645          (insert saved-text)
1646          (set-buffer-modified-p modified-flag))
1647        (error (error-message-string err))))))
1648
1649 ;;;###mh-autoload
1650 (defun mh-mml-unsecure-message ()
1651   "Remove any secure message tags."
1652   (interactive)
1653   (if (not mh-pgp-support-flag)
1654       (error "Your version of Gnus does not support PGP/GPG")
1655     (mml-unsecure-message)))
1656
1657 \f
1658
1659 ;;; Support Routines for MH-Letter Commands
1660
1661 ;;;###mh-autoload
1662 (defun mh-mml-tag-present-p ()
1663   "Check if the current buffer has text which may be a MML tag."
1664   (save-excursion
1665     (goto-char (point-min))
1666     (re-search-forward
1667      (concat
1668       "\\(<#\\(mml\\|part\\)\\(.\\|\n\\)*>[ \n\t]*<#/\\(mml\\|part\\)>\\|"
1669       "^<#secure.+>$\\)")
1670      nil t)))
1671
1672 (defvar mh-media-type-regexp
1673   (concat (regexp-opt '("text" "image" "audio" "video" "application"
1674                         "multipart" "message") t)
1675           "/[-.+a-zA-Z0-9]+")
1676   "Regexp matching valid media types used in MIME attachment compositions.")
1677
1678 ;;;###mh-autoload
1679 (defun mh-mh-directive-present-p (&optional begin end)
1680   "Check if the text between BEGIN and END might be a MH-style directive.
1681 The optional argument BEGIN defaults to the beginning of the
1682 buffer, while END defaults to the end of the buffer."
1683   (unless begin (setq begin (point-min)))
1684   (unless end (setq end (point-max)))
1685   (save-excursion
1686     (block 'search-for-mh-directive
1687       (goto-char begin)
1688       (while (re-search-forward "^#" end t)
1689         (let ((s (buffer-substring-no-properties
1690                   (point) (mh-line-end-position))))
1691           (cond ((equal s ""))
1692                 ((string-match "^forw[ \t\n]+" s)
1693                  (return-from 'search-for-mh-directive t))
1694                 (t (let ((first-token (car (split-string s "[ \t;@]"))))
1695                      (when (and first-token
1696                                 (string-match mh-media-type-regexp
1697                                               first-token))
1698                        (return-from 'search-for-mh-directive t)))))))
1699       nil)))
1700
1701 (defun mh-minibuffer-read-type (filename &optional default)
1702   "Return the content type associated with the given FILENAME.
1703 If the \"file\" command exists and recognizes the given file,
1704 then its value is returned\; otherwise, the user is prompted for
1705 a type (see `mailcap-mime-types').
1706 Optional argument DEFAULT is returned if a type isn't entered."
1707   (mailcap-parse-mimetypes)
1708   (let* ((default (or default
1709                       (mm-default-file-encoding filename)
1710                       "application/octet-stream"))
1711          (probed-type (mh-file-mime-type filename))
1712          (type (or (and (not (equal probed-type "application/octet-stream"))
1713                         probed-type)
1714                    (completing-read
1715                     (format "Content type (default %s): " default)
1716                     (mapcar 'list (mailcap-mime-types))))))
1717     (if (not (equal type ""))
1718         type
1719       default)))
1720
1721 ;;;###mh-autoload
1722 (defun mh-file-mime-type (filename)
1723   "Return MIME type of FILENAME from file command.
1724 Returns nil if file command not on system."
1725   (cond
1726    ((not (mh-have-file-command))
1727     nil)                                ;no file command, exit now
1728    ((not (and (file-exists-p filename)
1729               (file-readable-p filename)))
1730     nil)                               ;no file or not readable, ditto
1731    (t
1732     (save-excursion
1733       (let ((tmp-buffer (get-buffer-create mh-temp-buffer)))
1734         (set-buffer tmp-buffer)
1735         (unwind-protect
1736             (progn
1737               (call-process "file" nil '(t nil) nil "-b" "-i"
1738                             (expand-file-name filename))
1739               (goto-char (point-min))
1740               (if (not (re-search-forward mh-media-type-regexp nil t))
1741                   nil
1742                 (mh-file-mime-type-substitute (match-string 0) filename)))
1743           (kill-buffer tmp-buffer)))))))
1744
1745 (defvar mh-file-mime-type-substitutions
1746   '(("application/msword" "\.xls" "application/ms-excel")
1747     ("application/msword" "\.ppt" "application/ms-powerpoint")
1748     ("text/plain" "\.vcf" "text/x-vcard")
1749     ("text/rtf" "\.rtf" "application/rtf")
1750     ("application/x-zip" "\.sxc" "application/vnd.sun.xml.calc")
1751     ("application/x-zip" "\.sxd" "application/vnd.sun.xml.draw")
1752     ("application/x-zip" "\.sxi" "application/vnd.sun.xml.impress")
1753     ("application/x-zip" "\.sxw" "application/vnd.sun.xml.writer")
1754     ("application/x-zip" "\.odg" "application/vnd.oasis.opendocument.graphics")
1755     ("application/x-zip" "\.odi" "application/vnd.oasis.opendocument.image")
1756     ("application/x-zip" "\.odp"
1757      "application/vnd.oasis.opendocument.presentation")
1758     ("application/x-zip" "\.ods"
1759      "application/vnd.oasis.opendocument.spreadsheet")
1760     ("application/x-zip" "\.odt" "application/vnd.oasis.opendocument.text"))
1761   "Substitutions to make for Content-Type returned from file command.
1762 The first element is the Content-Type returned by the file command.
1763 The second element is a regexp matching the file name, usually the
1764 extension.
1765 The third element is the Content-Type to replace with.")
1766
1767 (defun mh-file-mime-type-substitute (content-type filename)
1768   "Return possibly changed CONTENT-TYPE on the FILENAME.
1769 Substitutions are made from the `mh-file-mime-type-substitutions'
1770 variable."
1771   (let ((subst mh-file-mime-type-substitutions)
1772         (type) (match) (answer content-type)
1773         (case-fold-search t))
1774     (while subst
1775       (setq type (car (car subst))
1776             match (elt (car subst) 1))
1777       (if (and (string-equal content-type type)
1778                (string-match match filename))
1779           (setq answer (elt (car subst) 2)
1780                 subst nil)
1781         (setq subst (cdr subst))))
1782     answer))
1783
1784 (defvar mh-have-file-command 'undefined
1785   "Cached value of function `mh-have-file-command'.
1786 Do not reference this variable directly as it might not have been
1787 initialized. Always use the command `mh-have-file-command'.")
1788
1789 ;;;###mh-autoload
1790 (defun mh-have-file-command ()
1791   "Return t if 'file' command is on the system.
1792 'file -i' is used to get MIME type of composition insertion."
1793   (when (eq mh-have-file-command 'undefined)
1794     (setq mh-have-file-command
1795           (and (fboundp 'executable-find)
1796                (executable-find "file") ; file command exists
1797                                         ;   and accepts -i and -b args.
1798                (zerop (call-process "file" nil nil nil "-i" "-b"
1799                                     (expand-file-name "inc" mh-progs))))))
1800   mh-have-file-command)
1801
1802 \f
1803
1804 ;;; MIME Cleanup
1805
1806 ;;;###mh-autoload
1807 (defun mh-mime-cleanup ()
1808   "Free the decoded MIME parts."
1809   (let ((mime-data (gethash (current-buffer) mh-globals-hash)))
1810     ;; This is for Emacs, what about XEmacs?
1811     (mh-funcall-if-exists remove-images (point-min) (point-max))
1812     (when mime-data
1813       (mh-mm-destroy-parts (mh-mime-handles mime-data))
1814       (remhash (current-buffer) mh-globals-hash))))
1815
1816 ;;;###mh-autoload
1817 (defun mh-destroy-postponed-handles ()
1818   "Free MIME data for externally displayed MIME parts."
1819   (let ((mime-data (mh-buffer-data)))
1820     (when mime-data
1821       (mh-mm-destroy-parts (mh-mime-handles mime-data)))
1822     (remhash (current-buffer) mh-globals-hash)))
1823
1824 (provide 'mh-mime)
1825
1826 ;; Local Variables:
1827 ;; indent-tabs-mode: nil
1828 ;; sentence-end-double-space: nil
1829 ;; End:
1830
1831 ;; arch-tag: 0dd36518-1b64-4a84-8f4e-59f422d3f002
1832 ;;; mh-mime.el ends here