_spacemacs.d/local: import mu4e git20160515

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+;;; mu4e-view.el -- part of mu4e, the mu mail user agent
+;;
+;; Copyright (C) 2011-2016 Dirk-Jan C. Binnema
+
+;; Author: Dirk-Jan C. Binnema <djcb@djcbsoftware.nl>
+;; Maintainer: Dirk-Jan C. Binnema <djcb@djcbsoftware.nl>
+
+;; This file is not part of GNU Emacs.
+;;
+;; GNU Emacs is free software: you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation, either version 3 of the License, or
+;; (at your option) any later version.
+
+;; GNU Emacs is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;; In this file we define mu4e-view-mode (+ helper functions), which is used for
+;; viewing e-mail messages
+
+;;; Code:
+(require 'mu4e-utils) ;; utility functions
+(require 'mu4e-vars)
+(require 'mu4e-mark)
+(require 'mu4e-proc)
+(require 'mu4e-compose)
+(require 'mu4e-actions)
+(require 'mu4e-message)
+
+(require 'comint)
+(require 'browse-url)
+(require 'button)
+(require 'epa)
+(require 'epg)
+(require 'thingatpt)
+(require 'calendar)
+
+(eval-when-compile (byte-compile-disable-warning 'cl-functions))
+(require 'cl)
+
+
+;; the message view
+(defgroup mu4e-view nil
+  "Settings for the message view."
+  :group 'mu4e)
+
+(defcustom mu4e-view-fields
+  '(:from :to  :cc :subject :flags :date :maildir :mailing-list :tags
+          :attachments :signature :decryption)
+  "Header fields to display in the message view buffer.
+For the complete list of available headers, see `mu4e-header-info'."
+  :type (list 'symbol)
+  :group 'mu4e-view)
+
+
+(defcustom mu4e-view-show-addresses nil
+  "Whether to initially show full e-mail addresses for contacts in
+address fields, rather than only their names."
+  :type 'boolean
+  :group 'mu4e-view)
+
+(make-obsolete-variable 'mu4e-view-wrap-lines nil "0.9.9-dev7")
+(make-obsolete-variable 'mu4e-view-hide-cited nil "0.9.9-dev7")
+
+(defcustom mu4e-view-date-format "%c"
+  "Date format to use in the message view.
+In the format of `format-time-string'."
+  :type 'string
+  :group 'mu4e-view)
+
+(defcustom mu4e-view-image-max-width 800
+  "The maximum width for images to display.
+This is only effective if you're using an emacs with Imagemagick
+support, and `mu4e-view-show-images' is non-nil."
+  :group 'mu4e-view)
+
+(defcustom mu4e-view-image-max-height 600
+  "The maximum height for images to display.
+This is only effective if you're using an emacs with Imagemagick
+support, and `mu4e-view-show-images' is non-nil."
+  :group 'mu4e-view)
+
+(defcustom mu4e-view-scroll-to-next t
+  "If non-nil, move to the next message when calling
+`mu4e-view-scroll-up-or-next' (typically bound to SPC) when at the
+end of a message. Otherwise, don't move to the next message.")
+
+(defcustom mu4e-save-multiple-attachments-without-asking nil
+  "If non-nil, saving multiple attachments asks once for a
+directory and saves all attachments in the chosen directory."
+  :type 'boolean
+  :group 'mu4e-view)
+
+(defvar mu4e-view-actions
+  '( ("capture message"  . mu4e-action-capture-message)
+     ("view as pdf"      . mu4e-action-view-as-pdf)
+     ("show this thread" . mu4e-action-show-thread))
+  "List of actions to perform on messages in view mode.
+The actions are of the form:
+  (NAME FUNC)
+where:
+* NAME is the name of the action (e.g. \"Count lines\")
+* FUNC is a function which receives a message plist as an argument.
+
+The first letter of NAME is used as a shortcut character.")
+
+(defvar mu4e-view-attachment-actions
+  '( ("wopen-with" . mu4e-view-open-attachment-with)
+     ("ein-emacs"  . mu4e-view-open-attachment-emacs)
+     ("dimport-in-diary"  . mu4e-view-import-attachment-diary)
+     ("|pipe"      . mu4e-view-pipe-attachment))
+  "List of actions to perform on message attachments.
+The actions are cons-cells of the form:
+ (NAME . FUNC)
+where:
+* NAME is the name of the action (e.g. \"Count lines\")
+* FUNC is a function which receives two arguments: the message
+  plist and the attachment number.
+The first letter of NAME is used as a shortcut character.")
+
+(defvar mu4e-view-fill-headers t
+  "If non-nil, automatically fill the headers when viewing them.")
+
+(defvar mu4e-view-contacts-header-keymap
+  (let ((map (make-sparse-keymap)))
+    (define-key map [mouse-2] 'mu4e~view-compose-contact)
+    (define-key map "C"  'mu4e~view-compose-contact)
+    (define-key map "c"  'mu4e~view-copy-contact)
+    map)
+  "Keymap used for the contacts in the header fields.")
+
+(defvar mu4e-view-clickable-urls-keymap
+  (let ((map (make-sparse-keymap)))
+    (define-key map [mouse-1] 'mu4e~view-browse-url-from-binding)
+    (define-key map [?\M-\r] 'mu4e~view-browse-url-from-binding)
+    map)
+  "Keymap used for the urls inside the body.")
+
+(defvar mu4e-view-attachments-header-keymap
+  (let ((map (make-sparse-keymap)))
+    (define-key map [mouse-1] 'mu4e~view-open-attach-from-binding)
+    (define-key map  [?\M-\r] 'mu4e~view-open-attach-from-binding)
+    (define-key map [mouse-2] 'mu4e~view-save-attach-from-binding)
+    (define-key map (kbd "<S-return>") 'mu4e~view-save-attach-from-binding)
+    map)
+  "Keymap used in the \"Attachements\" header field.")
+
+(defcustom mu4e-view-auto-mark-as-read t
+  "Automatically mark messages are 'read' when you read
+them. This is typically the expected behavior, but can be turned
+off, for example when using a read-only file-system."
+  :type 'boolean
+  :group 'mu4e-view)
+
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+
+(defvar mu4e~view-cited-hidden nil "Whether cited lines are hidden.")
+(defvar mu4e~view-link-map nil
+  "A map of some number->url so we can jump to url by number.")
+
+(defvar mu4e~path-parent-docid-map (make-hash-table :test 'equal)
+  "A map of msg paths --> parent-docids.
+This is to determine what is the parent docid for embedded
+message extracted at some path.")
+
+(defvar mu4e~view-attach-map nil
+  "A mapping of user-visible attachment number to the actual part index.")
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(defun mu4e-view-message-with-message-id (msgid)
+  "View message with message-id MSGID. This (re)creates a
+headers-buffer with a search for MSGID, then open a view for that
+message."
+  (mu4e-headers-search (concat "msgid:" msgid) nil nil t msgid t))
+
+(define-obsolete-function-alias 'mu4e-view-message-with-msgid
+  'mu4e-view-message-with-message-id "0.9.17")
+
+(defun mu4e~view-custom-field (msg field)
+  "Show some custom header field, or raise an error if it is not
+found."
+  (let* ((item (or (assoc field mu4e-header-info-custom)
+		 (mu4e-error "field %S not found" field)))
+	  (func (or (plist-get (cdr-safe item) :function)
+		  (mu4e-error "no :function defined for field %S %S"
+		    field (cdr item)))))
+    (funcall func msg)))
+
+
+(defun mu4e-view-message-text (msg)
+  "Return the message to display (as a string), based on the MSG plist."
+  (concat
+    (mapconcat
+      (lambda (field)
+	(let ((fieldval (mu4e-message-field msg field)))
+	  (case field
+	    (:subject  (mu4e~view-construct-header field fieldval))
+	    (:path     (mu4e~view-construct-header field fieldval))
+	    (:maildir  (mu4e~view-construct-header field fieldval))
+	    ((:flags :tags) (mu4e~view-construct-flags-tags-header
+			      field fieldval))
+
+	    ;; contact fields
+	    (:to       (mu4e~view-construct-contacts-header msg field))
+	    (:from     (mu4e~view-construct-contacts-header msg field))
+	    (:cc       (mu4e~view-construct-contacts-header msg field))
+	    (:bcc      (mu4e~view-construct-contacts-header msg field))
+
+	    ;; if we (`user-mail-address' are the From, show To, otherwise,
+	    ;; show From
+	    (:from-or-to
+	      (let* ((from (mu4e-message-field msg :from))
+		      (from (and from (cdar from))))
+		(if (mu4e-user-mail-address-p from)
+		  (mu4e~view-construct-contacts-header msg :to)
+		  (mu4e~view-construct-contacts-header msg :from))))
+	    ;; date
+	    (:date
+	      (let ((datestr
+		      (when fieldval (format-time-string mu4e-view-date-format
+				       fieldval))))
+		(if datestr (mu4e~view-construct-header field datestr) "")))
+	    ;; size
+	    (:size
+	      (mu4e~view-construct-header field (mu4e-display-size fieldval)))
+	    (:mailing-list
+	      (mu4e~view-construct-header field fieldval))
+	    (:message-id
+	      (mu4e~view-construct-header field fieldval))
+	    ;; attachments
+	    (:attachments (mu4e~view-construct-attachments-header msg))
+	    ;; pgp-signatures
+	    (:signature   (mu4e~view-construct-signature-header msg))
+	    ;; pgp-decryption
+	    (:decryption  (mu4e~view-construct-decryption-header msg))
+	    (t (mu4e~view-construct-header field
+		 (mu4e~view-custom-field msg field))))))
+      mu4e-view-fields "")
+    "\n"
+    (let ((body (mu4e-message-body-text msg)))
+      (when (fboundp 'add-face-text-property)
+        (add-face-text-property 0 (length body) 'mu4e-view-body-face t body))
+      body)))
+
+(defun mu4e~view-embedded-winbuf ()
+  "Get a buffer (shown in a window) for the embedded message."
+  (let* ((buf (get-buffer-create mu4e~view-embedded-buffer-name))
+	  (win (or (get-buffer-window buf) (split-window-vertically))))
+    (select-window win)
+    (switch-to-buffer buf)))
+
+(defun mu4e~delete-all-overlays ()
+  "`delete-all-overlays' with compatibility fallback."
+  (if (functionp 'delete-all-overlays)
+    (delete-all-overlays)
+    (remove-overlays)))
+
+
+(defun mu4e-view (msg headersbuf)
+  "Display the message MSG in a new buffer, and keep in sync with HDRSBUF.
+'In sync' here means that moving to the next/previous message in
+the the message view affects HDRSBUF, as does marking etc.
+
+As a side-effect, a message that is being viewed loses its 'unread'
+marking if it still had that."
+  (let* ((embedded ;; is it as an embedded msg (ie. message/rfc822 att)?
+	   (when (gethash (mu4e-message-field msg :path)
+		   mu4e~path-parent-docid-map) t))
+	  (buf
+	    (if embedded
+	      (mu4e~view-embedded-winbuf)
+	      (get-buffer-create mu4e~view-buffer-name))))
+    ;; note: mu4e~view-mark-as-read-maybe will pseudo-recursively call mu4e-view
+    ;; again by triggering mu4e~view again as it marks the message as read
+    (with-current-buffer buf
+      (switch-to-buffer buf)
+      (setq mu4e~view-msg msg)
+      (when (or embedded (not (mu4e~view-mark-as-read-maybe msg)))
+	(let ((inhibit-read-only t))
+	  (erase-buffer)
+	  (mu4e~delete-all-overlays)
+	  (insert (mu4e-view-message-text msg))
+	  (goto-char (point-min))
+	  (mu4e~fontify-cited)
+	  (mu4e~fontify-signature)
+	  (mu4e~view-make-urls-clickable)
+	  (mu4e~view-show-images-maybe msg)
+	  (setq
+	    mu4e~view-buffer buf
+	    mu4e~view-headers-buffer headersbuf)
+	  (when embedded (local-set-key "q" 'kill-buffer-and-window))
+	  (mu4e-view-mode))))))
+
+(defun mu4e~view-get-property-from-event (prop)
+  "Get the property PROP at point, or the location of the mouse.
+The action is chosen based on the `last-command-event'.
+Meant to be evoked from interactive commands."
+  (if (and (eventp last-command-event)
+	   (mouse-event-p last-command-event))
+      (let ((posn (event-end last-command-event)))
+        (when (numberp (posn-point posn))
+          (get-text-property
+           (posn-point posn)
+           prop
+           (window-buffer (posn-window posn)))
+          ))
+    (get-text-property (point) prop)))
+
+(defun mu4e~view-construct-header (field val &optional dont-propertize-val)
+  "Return header field FIELD (as in `mu4e-header-info') with value
+VAL if VAL is non-nil. If DONT-PROPERTIZE-VAL is non-nil, do not
+add text-properties to VAL."
+  (let* ((info (cdr (assoc field
+		      (append mu4e-header-info mu4e-header-info-custom))))
+	  (key (plist-get info :name))
+	  (help (plist-get info :help)))
+    (if (and val (> (length val) 0))
+    (with-temp-buffer
+      (insert (propertize (concat key ":")
+		'face 'mu4e-header-key-face
+		'help-echo help) " "
+	(if dont-propertize-val
+	  val
+	  (propertize val 'face 'mu4e-header-value-face)) "\n")
+      (when mu4e-view-fill-headers
+	;; temporarily set the fill column <margin> positions to the right, so
+	;; we can indent the following lines correctly
+	(let* ((margin 1)
+		(fill-column (max (- fill-column margin) 0)))
+	  (fill-region (point-min) (point-max))
+	  (goto-char (point-min))
+	  (while (and (zerop (forward-line 1)) (not (looking-at "^$")))
+	    (indent-to-column margin))))
+      (buffer-string))
+    "")))
+
+(defun mu4e~view-compose-contact (&optional point)
+  "Compose a message for the address at point."
+  (interactive)
+  (unless (get-text-property (or point (point)) 'email)
+    (mu4e-error "No address at point"))
+  (mu4e~compose-mail (get-text-property (or point (point)) 'long)))
+
+(defun mu4e~view-copy-contact (&optional full)
+  "Compose a message for the address at (point)."
+  (interactive "P")
+  (let ((email (get-text-property (point) 'email))
+	 (long (get-text-property (point) 'long)))
+    (unless email (mu4e-error "No address at point"))
+    (kill-new (if full long email))
+    (mu4e-message "Address copied.")))
+
+(defun mu4e~view-construct-contacts-header (msg field)
+  "Add a header for a contact field (ie., :to, :from, :cc, :bcc)."
+  (mu4e~view-construct-header field
+    (mapconcat
+      (lambda(c)
+	(let* ((name (when (car c)
+		       (replace-regexp-in-string "[[:cntrl:]]" "" (car c))))
+		(email (when (cdr c)
+			 (replace-regexp-in-string "[[:cntrl:]]" "" (cdr c))))
+		(short (or name email)) ;; name may be nil
+		(long (if name (format "%s <%s>" name email) email)))
+	  (propertize
+	    (if mu4e-view-show-addresses long short)
+	    'long long
+	    'short short
+	    'email email
+	    'keymap mu4e-view-contacts-header-keymap
+	    'face 'mu4e-contact-face
+	    'mouse-face 'highlight
+	    'help-echo (format "<%s>\n%s" email
+			 "[mouse-2] or C to compose a mail for this recipient"))))
+	  (mu4e-message-field msg field) ", ") t))
+
+
+(defun mu4e~view-construct-flags-tags-header (field val)
+  "Construct a Flags: header."
+  (mu4e~view-construct-header
+    field
+    (mapconcat
+      (lambda (flag)
+	(propertize
+	  (if (symbolp flag)
+	    (symbol-name flag)
+	    flag)
+	  'face 'mu4e-special-header-value-face))
+      val
+      (propertize ", " 'face 'mu4e-header-value-face)) t))
+
+(defun mu4e~view-construct-signature-header (msg)
+  "Construct a Signature: header, if there are any signed parts."
+  (let* ((parts (mu4e-message-field msg :parts))
+	  (verdicts
+	    (remove-if 'null
+	      (mapcar (lambda (part) (mu4e-message-part-field part :signature))
+		parts)))
+	  (val (when verdicts
+		 (mapconcat
+		   (lambda (v)
+		     (propertize (symbol-name v)
+		       'face (if (eq v 'verified)
+			       'mu4e-ok-face 'mu4e-warning-face)))
+		   verdicts ", ")))
+	  (btn (when val
+		 (with-temp-buffer
+		   (insert-text-button "Details"
+		     'action (lambda (b)
+			       (mu4e-view-verify-msg-popup
+				 (button-get b 'msg))))
+		   (buffer-string))))
+	  (val (when val (concat val " (" btn ")"))))
+    (mu4e~view-construct-header :signature val t)))
+
+(defun mu4e~view-construct-decryption-header (msg)
+  "Construct a Decryption: header, if there are any encrypted parts."
+  (let* ((parts (mu4e-message-field msg :parts))
+	 (verdicts
+	  (remove-if 'null
+	    (mapcar (lambda (part)
+		      (mu4e-message-part-field part :decryption))
+	      parts)))
+	 (succeeded (remove-if (lambda (v) (eq v 'failed)) verdicts))
+	 (failed (remove-if (lambda (v) (eq v 'succeeded)) verdicts))
+	 (succ (when succeeded
+		 (propertize
+		  (concat (number-to-string (length succeeded))
+			  " part(s) decrypted")
+		  'face 'mu4e-ok-face)))
+	 (fail (when failed
+		 (propertize
+		  (concat (number-to-string (length failed))
+			  " part(s) failed")
+		  'face 'mu4e-warning-face)))
+	 (val (concat succ fail)))
+    (mu4e~view-construct-header :decryption val t)))
+
+(defun mu4e~view-open-attach-from-binding ()
+  "Open the attachement at point, or click location."
+  (interactive)
+  (let* (( msg (mu4e~view-get-property-from-event 'mu4e-msg))
+         ( attnum (mu4e~view-get-property-from-event 'mu4e-attnum)))
+    (when (and msg attnum)
+      (mu4e-view-open-attachment msg attnum))))
+
+(defun mu4e~view-save-attach-from-binding ()
+  "Save the attachement at point, or click location."
+  (interactive)
+  (let* (( msg (mu4e~view-get-property-from-event 'mu4e-msg))
+         ( attnum (mu4e~view-get-property-from-event 'mu4e-attnum)))
+    (when (and msg attnum)
+      (mu4e-view-save-attachment-single msg attnum))))
+
+(defun mu4e~view-construct-attachments-header (msg)
+  "Display attachment information; the field looks like something like:
+   	:parts ((:index 1 :name \"1.part\" :mime-type \"text/plain\"
+                 :type (leaf) :attachment nil :size 228)
+                (:index 2 :name \"analysis.doc\"
+                 :mime-type \"application/msword\"
+                 :type (leaf attachment) :attachment nil :size 605196))"
+  (setq mu4e~view-attach-map ;; buffer local
+    (make-hash-table :size 64 :weakness nil))
+  (let* ((id 0)
+	  (attachments
+	    ;; we only list parts that look like attachments, ie. that have a
+	    ;; non-nil :attachment property; we record a mapping between
+	    ;; user-visible numbers and the part indices
+	    (remove-if-not
+	      (lambda (part)
+		(let* ((mtype (or (mu4e-message-part-field part :mime-type)
+				"application/octet-stream"))
+			(attachtype (mu4e-message-part-field part :type))
+			(isattach
+			  (or ;; we consider parts marked either
+			    ;; "attachment" or "inline" as attachment.
+			    (member 'attachment attachtype)
+			    ;; list inline parts as attachment (so they can be
+			    ;; saved), unless they are text/plain, which are
+			    ;; usually just message footers in mailing lists
+			    (and (member 'inline attachtype)
+			      (not (string-match "^text/plain" mtype))))))
+		  (or ;; remove if it's not an attach *or* if it's an
+		    ;; image/audio/application type (but not a signature)
+		    isattach
+		    (string-match "^\\(image\\|audio\\)" mtype)
+		    (string= "message/rfc822" mtype)
+		    (string= "text/calendar" mtype)
+		    (and (string-match "^application" mtype)
+		      (not (string-match "signature" mtype))))))
+	      (mu4e-message-field msg :parts)))
+	  (attstr
+	    (mapconcat
+	      (lambda (part)
+		(let ((index (mu4e-message-part-field part :index))
+		       (name (mu4e-message-part-field part :name))
+		       (size (mu4e-message-part-field part :size)))
+		  (incf id)
+		  (puthash id index mu4e~view-attach-map)
+
+		  (concat
+		    (propertize (format "[%d]" id)
+		      'face 'mu4e-attach-number-face)
+		    (propertize name 'face 'mu4e-link-face
+		      'keymap mu4e-view-attachments-header-keymap
+		      'mouse-face 'highlight
+		      'help-echo (concat
+				  "[mouse-1] or [M-RET] opens the attachment\n"
+				  "[mouse-2] or [S-RET] offers to save it")
+		      'mu4e-msg msg
+		      'mu4e-attnum id
+		      )
+		    (when (and size (> size 0))
+		      (propertize (format "(%s)" (mu4e-display-size size))
+                                  'face 'mu4e-header-key-face)))))
+	      attachments ", ")))
+    (when attachments
+      (mu4e~view-construct-header :attachments attstr t))))
+
+(defun mu4e-view-for-each-part (msg func)
+  "Apply FUNC to each part in MSG.
+FUNC should be a function taking two arguments:
+ 1. the message MSG, and
+ 2. a plist describing the attachment. The plist looks like:
+    	 (:index 1 :name \"test123.doc\"
+          :mime-type \"application/msword\" :attachment t :size 1234)."
+  (dolist (part (mu4e-msg-field msg :parts))
+    (funcall func msg part)))
+
+(defvar mu4e-view-mode-map nil
+  "Keymap for \"*mu4e-view*\" buffers.")
+(unless mu4e-view-mode-map
+  (setq mu4e-view-mode-map
+    (let ((map (make-sparse-keymap)))
+
+      (define-key map  (kbd "C-S-u") 'mu4e-update-mail-and-index)
+      (define-key map  (kbd "C-c C-u") 'mu4e-update-mail-and-index)
+
+      (define-key map "q" 'mu4e~view-quit-buffer)
+
+      ;; note, 'z' is by-default bound to 'bury-buffer'
+      ;; but that's not very useful in this case
+      (define-key map "z" 'ignore)
+
+      (define-key map "s" 'mu4e-headers-search)
+      (define-key map "S" 'mu4e-view-search-edit)
+      (define-key map "/" 'mu4e-view-search-narrow)
+
+      (define-key map (kbd "<M-left>")  'mu4e-headers-query-prev)
+      (define-key map (kbd "<M-right>") 'mu4e-headers-query-next)
+
+      (define-key map "b" 'mu4e-headers-search-bookmark)
+      (define-key map "B" 'mu4e-headers-search-bookmark-edit)
+
+      (define-key map "%" 'mu4e-view-mark-pattern)
+      (define-key map "t" 'mu4e-view-mark-subthread)
+      (define-key map "T" 'mu4e-view-mark-thread)
+
+      (define-key map "v" 'mu4e-view-verify-msg-popup)
+
+      (define-key map "j" 'mu4e~headers-jump-to-maildir)
+
+      (define-key map "g" 'mu4e-view-go-to-url)
+      (define-key map "k" 'mu4e-view-save-url)
+      (define-key map "f" 'mu4e-view-fetch-url)
+
+      (define-key map "F" 'mu4e-compose-forward)
+      (define-key map "R" 'mu4e-compose-reply)
+      (define-key map "C" 'mu4e-compose-new)
+      (define-key map "E" 'mu4e-compose-edit)
+
+      (define-key map "." 'mu4e-view-raw-message)
+      (define-key map "|" 'mu4e-view-pipe)
+      (define-key map "a" 'mu4e-view-action)
+
+      (define-key map ";" 'mu4e-context-switch)
+      
+      ;; toggle header settings
+      (define-key map "O" 'mu4e-headers-change-sorting)
+      (define-key map "P" 'mu4e-headers-toggle-threading)
+      (define-key map "Q" 'mu4e-headers-toggle-full-search)
+      (define-key map "W" 'mu4e-headers-toggle-include-related)
+
+      ;; change the number of headers
+      (define-key map (kbd "C-+") 'mu4e-headers-split-view-grow)
+      (define-key map (kbd "C--") 'mu4e-headers-split-view-shrink)
+      (define-key map (kbd "<C-kp-add>") 'mu4e-headers-split-view-grow)
+      (define-key map (kbd "<C-kp-subtract>") 'mu4e-headers-split-view-shrink)
+
+      ;; intra-message navigation
+      (define-key map (kbd "SPC") 'mu4e-view-scroll-up-or-next)
+      (define-key map (kbd "<home>") 'beginning-of-buffer)
+      (define-key map (kbd "<end>") 'end-of-buffer)
+      (define-key map (kbd "RET") 'mu4e-scroll-up)
+      (define-key map (kbd "<backspace>") 'mu4e-scroll-down)
+
+      ;; navigation between messages
+      (define-key map "p" 'mu4e-view-headers-prev)
+      (define-key map "n" 'mu4e-view-headers-next)
+      ;; the same
+      (define-key map (kbd "<M-down>") 'mu4e-view-headers-next)
+      (define-key map (kbd "<M-up>") 'mu4e-view-headers-prev)
+
+      (define-key map (kbd "[") 'mu4e-view-headers-prev-unread)
+      (define-key map (kbd "]") 'mu4e-view-headers-next-unread)
+      
+      ;; switching to view mode (if it's visible)
+      (define-key map "y" 'mu4e-select-other-view)
+
+      ;; attachments
+      (define-key map "e" 'mu4e-view-save-attachment)
+      (define-key map "o" 'mu4e-view-open-attachment)
+      (define-key map "A" 'mu4e-view-attachment-action)
+
+      ;; marking/unmarking
+      (define-key map "d" 'mu4e-view-mark-for-trash)
+      (define-key map (kbd "<delete>") 'mu4e-view-mark-for-delete)
+      (define-key map (kbd "<deletechar>") 'mu4e-view-mark-for-delete)
+      (define-key map (kbd "D") 'mu4e-view-mark-for-delete)
+      (define-key map (kbd "m") 'mu4e-view-mark-for-move)
+      (define-key map (kbd "r") 'mu4e-view-mark-for-refile)
+
+      (define-key map (kbd "?") 'mu4e-view-mark-for-unread)
+      (define-key map (kbd "!") 'mu4e-view-mark-for-read)
+
+      (define-key map (kbd "+") 'mu4e-view-mark-for-flag)
+      (define-key map (kbd "-") 'mu4e-view-mark-for-unflag)
+      (define-key map (kbd "=") 'mu4e-view-mark-for-untrash)
+      (define-key map (kbd "&") 'mu4e-view-mark-custom)
+      
+      (define-key map (kbd "*")             'mu4e-view-mark-for-something)
+      (define-key map (kbd "<kp-multiply>") 'mu4e-view-mark-for-something)
+      (define-key map (kbd "<insert>")     'mu4e-view-mark-for-something)
+      (define-key map (kbd "<insertchar>") 'mu4e-view-mark-for-something)
+
+      (define-key map (kbd "#") 'mu4e-mark-resolve-deferred-marks)
+
+      ;; misc
+      (define-key map "w" 'visual-line-mode)
+      (define-key map "#" 'mu4e-view-toggle-hide-cited)
+      (define-key map "h" 'mu4e-view-toggle-html)
+      (define-key map (kbd "M-q") 'mu4e-view-fill-long-lines)
+
+      ;; next 3 only warn user when attempt in the message view
+      (define-key map "u" 'mu4e-view-unmark)
+      (define-key map "U" 'mu4e-view-unmark-all)
+      (define-key map "x" 'mu4e-view-marked-execute)
+
+      (define-key map "$" 'mu4e-show-log)
+      (define-key map "H" 'mu4e-display-manual)
+
+      ;; menu
+      (define-key map [menu-bar] (make-sparse-keymap))
+      (let ((menumap (make-sparse-keymap "View")))
+	(define-key map [menu-bar headers] (cons "View" menumap))
+
+	(define-key menumap [quit-buffer]
+	  '("Quit view" . mu4e~view-quit-buffer))
+	(define-key menumap [display-help] '("Help" . mu4e-display-manual))
+
+	(define-key menumap [sepa0] '("--"))
+	(define-key menumap [wrap-lines]
+	  '("Toggle wrap lines" . visual-line-mode))
+	(define-key menumap [toggle-html]
+	  '("Toggle view-html" . mu4e-view-toggle-html))
+	(define-key menumap [hide-cited]
+	  '("Toggle hide cited" . mu4e-view-toggle-hide-cited))
+	(define-key menumap [raw-view]
+	  '("View raw message" . mu4e-view-raw-message))
+	(define-key menumap [pipe]
+	  '("Pipe through shell" . mu4e-view-pipe))
+	;; (define-key menumap [inspect]
+	;;   '("Inspect with guile" . mu4e-inspect-message))
+
+	(define-key menumap [sepa8] '("--"))
+	(define-key menumap [open-att]
+	  '("Open attachment" . mu4e-view-open-attachment))
+	(define-key menumap [extract-att]
+	  '("Extract attachment" . mu4e-view-save-attachment))
+
+	(define-key menumap [save-url]
+	  '("Save URL to kill-ring" . mu4e-view-save-url))
+	(define-key menumap [fetch-url]
+	  '("Fetch URL" . mu4e-view-fetch-url))
+	(define-key menumap [goto-url]
+	  '("Visit URL" . mu4e-view-go-to-url))
+
+	(define-key menumap [sepa1] '("--"))
+	(define-key menumap [mark-delete]
+	  '("Mark for deletion" . mu4e-view-mark-for-delete))
+	(define-key menumap [mark-trash]
+	  '("Mark for trash" .  mu4e-view-mark-for-trash))
+	(define-key menumap [mark-move]
+	  '("Mark for move" . mu4e-view-mark-for-move))
+
+	(define-key menumap [sepa2] '("--"))
+	(define-key menumap [resend]  '("Resend" . mu4e-compose-resend))
+	(define-key menumap [forward]  '("Forward" . mu4e-compose-forward))
+	(define-key menumap [reply]  '("Reply" . mu4e-compose-reply))
+	(define-key menumap [compose-new]  '("Compose new" . mu4e-compose-new))
+	(define-key menumap [sepa3] '("--"))
+
+	(define-key menumap [query-next]
+	  '("Next query" . mu4e-headers-query-next))
+	(define-key menumap [query-prev]
+	  '("Previous query" . mu4e-headers-query-prev))
+	(define-key menumap [narrow-search]
+	  '("Narrow search" . mu4e-headers-search-narrow))
+	(define-key menumap [bookmark]
+	  '("Search bookmark" . mu4e-headers-search-bookmark))
+	(define-key menumap [jump]
+	  '("Jump to maildir" . mu4e~headers-jump-to-maildir))
+	(define-key menumap [search]
+	  '("Search" . mu4e-headers-search))
+
+	(define-key menumap [sepa4] '("--"))
+	(define-key menumap [next]  '("Next" . mu4e-view-headers-next))
+	(define-key menumap [previous]  '("Previous" . mu4e-view-headers-prev)))
+      map)))
+
+(fset 'mu4e-view-mode-map mu4e-view-mode-map)
+
+(defcustom mu4e-view-mode-hook nil
+  "Hook run when entering Mu4e-View mode."
+  :options '(turn-on-visual-line-mode)
+  :type 'hook
+  :group 'mu4e-view)
+
+(defvar mu4e-view-mode-abbrev-table nil)
+(define-derived-mode mu4e-view-mode special-mode "mu4e:view"
+  "Major mode for viewing an e-mail message in mu4e.
+\\{mu4e-view-mode-map}."
+  (use-local-map mu4e-view-mode-map)
+
+  (make-local-variable 'mu4e~view-headers-buffer)
+  (make-local-variable 'mu4e~view-msg)
+  (make-local-variable 'mu4e~view-link-map)
+  (make-local-variable 'mu4e~view-attach-map)
+  (make-local-variable 'mu4e~view-cited-hidden)
+
+  ;; show context in mode-string
+  (set (make-local-variable 'global-mode-string) '(:eval (mu4e-context-label))) 
+ 
+  (setq buffer-undo-list t);; don't record undo info
+     
+  ;; autopair mode gives error when pressing RET
+  ;; turn it off
+  (when (boundp 'autopair-dont-activate)
+    (setq autopair-dont-activate t)))
+
+(defun mu4e~view-mark-as-read-maybe (msg)
+  "Clear the message MSG New/Unread status and set it to Seen.
+If the message is not New/Unread, do nothing. Evaluates to t if it
+triggers any changes, nil otherwise. If this function does any
+changes, it triggers a refresh."
+  (when (and mu4e-view-auto-mark-as-read msg)
+    (let ((flags (mu4e-message-field msg :flags))
+	   (msgid (mu4e-message-field msg :message-id))
+	   (docid (mu4e-message-field msg :docid)))
+      ;; attached (embedded) messages don't have docids; leave them alone if it is a new message
+      (when (and docid (or (member 'unread flags) (member 'new flags)))
+	;; mark /all/ messages with this message-id as read, so all copies of
+	;; this message will be marked as read.
+	(mu4e~proc-move msgid nil "+S-u-N")
+	t))))
+
+(defun mu4e~view-browse-url-func (url)
+  "Return a function that executes `browse-url' with URL.
+What browser is called is depending on
+`browse-url-browser-function' and `browse-url-mailto-function'."
+  (save-match-data
+    (if (string-match "^mailto:" url)
+      (lexical-let ((url url))
+	(lambda ()
+	  (interactive)
+	  (mu4e~compose-browse-url-mail url)))
+      (lexical-let ((url url))
+	(lambda ()
+	  (interactive)
+	  (browse-url url))))))
+
+(defun mu4e~view-browse-url-from-binding (&optional url)
+  "View in browser the url at point, or click location.
+If the optional argument URL is provided, browse that instead.
+If the url is mailto link, start writing an email to that address."
+  (interactive)
+  (let* (( url (or url (mu4e~view-get-property-from-event 'mu4e-url))))
+    (when url
+      (if (string-match-p "^mailto:" url)
+	  (mu4e~compose-browse-url-mail url)
+	(browse-url url)))))
+
+(defun mu4e~view-show-images-maybe (msg)
+  "Show attached images, if `mu4e-show-images' is non-nil."
+  (when (and (display-images-p) mu4e-view-show-images)
+    (mu4e-view-for-each-part msg
+      (lambda (msg part)
+	(when (string-match "^image/"
+		(or (mu4e-message-part-field part :mime-type)
+		  "application/object-stream"))
+	  (let ((imgfile (mu4e-message-part-field part :temp)))
+	    (when (and imgfile (file-exists-p imgfile))
+ 	      (save-excursion
+		(goto-char (point-max))
+		(mu4e-display-image imgfile
+		  mu4e-view-image-max-width
+		  mu4e-view-image-max-height)))))))))
+
+
+(defvar mu4e~view-beginning-of-url-regexp
+  "https?\\://\\|mailto:"
+  "Regexp that matches the beginning of http:/https:/mailto:
+URLs; match-string 1 will contain the matched URL, if any.")
+
+;; this is fairly simplistic...
+(defun mu4e~view-make-urls-clickable ()
+  "Turn things that look like URLs into clickable things.
+Also number them so they can be opened using `mu4e-view-go-to-url'."
+  (let ((num 0))
+    (save-excursion
+      (setq mu4e~view-link-map ;; buffer local
+	(make-hash-table :size 32 :weakness nil))
+      (goto-char (point-min))
+      (while (re-search-forward mu4e~view-beginning-of-url-regexp nil t)
+	(let ((bounds (thing-at-point-bounds-of-url-at-point)))
+	  (when bounds
+	    (let* ((url (thing-at-point-url-at-point))
+		    (ov (make-overlay (car bounds) (cdr bounds))))
+	      (puthash (incf num) url mu4e~view-link-map)
+	      (add-text-properties
+		(car bounds)
+		(cdr bounds)
+		`(face mu4e-link-face
+		   mouse-face highlight
+		   mu4e-url ,url
+		   keymap ,mu4e-view-clickable-urls-keymap
+		   help-echo
+		   "[mouse-1] or [M-RET] to open the link"))
+	      (overlay-put ov 'after-string
+		(propertize (format "[%d]" num)
+		  'face 'mu4e-url-number-face)))))))))
+
+
+(defun mu4e~view-hide-cited ()
+  "Toggle hiding of cited lines in the message body."
+  (save-excursion
+    (let ((inhibit-read-only t))
+      (goto-char (point-min))
+      (flush-lines mu4e-cited-regexp)
+      (setq mu4e~view-cited-hidden t))))
+
+(defmacro mu4e~view-in-headers-context (&rest body)
+  "Evaluate BODY in the context of the headers buffer connected to
+this view."
+  `(progn
+     (unless (buffer-live-p mu4e~view-headers-buffer)
+       (mu4e-error "no headers-buffer connected"))
+     (let* ((msg (mu4e-message-at-point))
+	     (docid (mu4e-message-field msg :docid))
+	     (curwin (selected-window)))
+       (unless docid
+	 (mu4e-error "message without docid: action is not possible."))
+       (with-current-buffer mu4e~view-headers-buffer
+	 (when (get-buffer-window)
+	   (select-window (get-buffer-window)))
+	 (if (mu4e~headers-goto-docid docid)
+	   ,@body
+	   (mu4e-error "cannot find message in headers buffer."))))))
+
+(defun mu4e-view-headers-next (&optional n)
+  "Move point to the next message header in the headers buffer
+connected with this message view. If this succeeds, return the new
+docid. Otherwise, return nil. Optionally, takes an integer
+N (prefix argument), to the Nth next header."
+  (interactive "P")
+  (mu4e~view-in-headers-context
+    (mu4e~headers-move (or n 1))))
+
+(defun mu4e-view-headers-prev (&optional n)
+  "Move point to the previous message header in the headers buffer
+connected with this message view. If this succeeds, return the new
+docid. Otherwise, return nil. Optionally, takes an integer
+N (prefix argument), to the Nth previous header."
+  (interactive "P")
+  (mu4e~view-in-headers-context
+    (mu4e~headers-move (- (or n 1)))))
+
+(defun mu4e~view-prev-or-next-unread (backwards)
+  "Move point to the next or previous (when BACKWARDS is non-`nil')
+unread message header in the headers buffer connected with this
+message view. If this succeeds, return the new docid. Otherwise,
+return nil."
+  (mu4e~view-in-headers-context 
+    (mu4e~headers-prev-or-next-unread backwards))
+  (mu4e-select-other-view)
+  (mu4e-headers-view-message))
+
+(defun mu4e-view-headers-prev-unread ()
+"Move point to the previous unread message header in the headers
+buffer connected with this message view. If this succeeds, return
+the new docid. Otherwise, return nil."
+  (interactive)
+  (mu4e~view-prev-or-next-unread t))
+
+(defun mu4e-view-headers-next-unread ()
+  "Move point to the next unread message header in the headers
+buffer connected with this message view. If this succeeds, return
+the new docid. Otherwise, return nil."
+  (interactive)
+  (mu4e~view-prev-or-next-unread nil))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+;; Interactive functions
+
+(defun mu4e-view-toggle-hide-cited ()
+  "Toggle hiding of cited lines in the message body."
+  (interactive)
+  (if mu4e~view-cited-hidden
+    (mu4e-view-refresh)
+    (mu4e~view-hide-cited)))
+
+(defun mu4e-view-toggle-html ()
+  "Toggle html-display of the message body (if any)."
+  (interactive)
+  (setq mu4e-view-prefer-html (not mu4e-view-prefer-html)) 
+  (mu4e-view-refresh)) 
+
+(defun mu4e-view-refresh ()
+  "Redisplay the current message."
+  (interactive)
+  (mu4e-view mu4e~view-msg mu4e~view-headers-buffer)
+  (setq mu4e~view-cited-hidden nil))
+
+(defun mu4e-view-action (&optional msg)
+  "Ask user for some action to apply on MSG, then do it.
+If MSG is nil apply action to message returned
+bymessage-at-point.  The actions are specified in
+`mu4e-view-actions'."
+  (interactive)
+  (let* ((msg (or msg (mu4e-message-at-point)))
+	  (actionfunc (mu4e-read-option "Action: " mu4e-view-actions)))
+    (funcall actionfunc msg)))
+
+(defun mu4e-view-mark-pattern ()
+    "Ask user for a kind of mark (move, delete etc.), a field to
+match and a regular expression to match with. Then, mark all
+matching messages with that mark."
+  (interactive)
+  (mu4e~view-in-headers-context (mu4e-headers-mark-pattern)))
+
+(defun mu4e-view-mark-thread (&optional markpair)
+  "Ask user for a kind of mark (move, delete etc.), and apply it
+to all messages in the thread at point in the headers view. The
+optional MARKPAIR can also be used to provide the mark
+selection."
+  (interactive)
+  (mu4e~view-in-headers-context
+   (if markpair (mu4e-headers-mark-thread nil markpair)
+       (call-interactively 'mu4e-headers-mark-thread))))
+
+(defun mu4e-view-mark-subthread (&optional markpair)
+  "Ask user for a kind of mark (move, delete etc.), and apply it
+to all messages in the subthread at point in the headers view.
+The optional MARKPAIR can also be used to provide the mark
+selection."
+  (interactive)
+  (mu4e~view-in-headers-context
+   (if markpair (mu4e-headers-mark-subthread markpair)
+     (mu4e-headers-mark-subthread))))
+
+(defun mu4e-view-search-narrow ()
+  "Run `mu4e-headers-search-narrow' in the headers buffer."
+  (interactive)
+  (mu4e~view-in-headers-context
+    (call-interactively 'mu4e-headers-search-narrow)))
+
+(defun mu4e-view-search-edit ()
+  "Run `mu4e-headers-search-edit' in the headers buffer."
+  (interactive)
+  (mu4e~view-in-headers-context (mu4e-headers-search-edit)))
+
+(defun mu4e-mark-region-code ()
+  "Highlight region marked with `message-mark-inserted-region'.
+Add this function to `mu4e-view-mode-hook' to enable this feature."
+  (require 'message)
+  (let (beg end ov-beg ov-end ov-inv)
+    (save-excursion
+      (goto-char (point-min))
+      (while (re-search-forward
+              (concat "^" message-mark-insert-begin) nil t)
+        (setq ov-beg (match-beginning 0)
+              ov-end (match-end 0)
+              ov-inv (make-overlay ov-beg ov-end)
+              beg    ov-end)
+        (overlay-put ov-inv 'invisible t)
+        (when (re-search-forward
+               (concat "^" message-mark-insert-end) nil t)
+          (setq ov-beg (match-beginning 0)
+                ov-end (match-end 0)
+                ov-inv (make-overlay ov-beg ov-end)
+                end    ov-beg)
+          (overlay-put ov-inv 'invisible t))
+        (when (and beg end)
+          (let ((ov (make-overlay beg end)))
+            (overlay-put ov 'face 'mu4e-region-code))
+          (setq beg nil end nil))))))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Wash functions
+(defun mu4e-view-fill-long-lines ()
+  "Fill lines that are wider than the window width or `fill-column'."
+  (interactive)
+  (with-current-buffer mu4e~view-buffer
+    (save-excursion
+      (let ((inhibit-read-only t)
+            (width (window-width (get-buffer-window (current-buffer)))))
+        (save-restriction
+          (message-goto-body)
+          (while (not (eobp))
+            (end-of-line)
+            (when (>= (current-column) (min fill-column width))
+              (narrow-to-region (min (1+ (point)) (point-max))
+                                (point-at-bol))
+              (let ((goback (point-marker)))
+                (fill-paragraph nil)
+                (goto-char (marker-position goback)))
+              (widen))
+            (forward-line 1)))))))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; attachment handling
+(defun mu4e~view-get-attach-num (prompt msg &optional multi)
+  "Ask the user with PROMPT for an attachment number for MSG, and
+ensure it is valid. The number is [1..n] for attachments
+\[0..(n-1)] in the message. If MULTI is nil, return the number for
+the attachment; otherwise (MULTI is non-nil), accept ranges of
+attachment numbers, as per `mu4e-split-ranges-to-numbers', and
+return the corresponding string."
+  (let* ((count (hash-table-count mu4e~view-attach-map)) (def))
+    (when (zerop count) (mu4e-error "No attachments for this message"))
+    (if (not multi)
+      (if (= count 1)
+	(read-number (mu4e-format "%s: " prompt) 1)
+	(read-number (mu4e-format "%s (1-%d): " prompt count)))
+      (progn
+	(setq def (if (= count 1) "1" (format "1-%d" count)))
+	(read-string (mu4e-format "%s (default %s): " prompt def)
+	  nil nil def)))))
+
+(defun mu4e~view-get-attach (msg attnum)
+  "Return the attachment plist in MSG corresponding to attachment
+number ATTNUM."
+  (let* ((partid (gethash attnum mu4e~view-attach-map))
+	 (attach
+	   (find-if
+	     (lambda (part)
+	       (eq (mu4e-message-part-field part :index) partid))
+	     (mu4e-message-field msg :parts))))
+    (or attach (mu4e-error "Not a valid attachment"))))
+
+
+(defun mu4e~view-request-attachment-path (fname path)
+  "Ask the user where to save FNAME (default is PATH/FNAME)."
+  (let ((fpath (expand-file-name
+                (read-file-name
+                 (mu4e-format "Save as ")
+                 path nil nil fname) path)))
+    (if (file-directory-p fpath)
+      (expand-file-name fname fpath)
+      fpath)))
+
+(defun mu4e~view-request-attachments-dir (path)
+  "Ask the user where to save multiple attachments (default is PATH)."
+  (let ((fpath (expand-file-name
+                (read-directory-name
+                 (mu4e-format "Save in directory ")
+                 path nil nil nil) path)))
+    (if (file-directory-p fpath)
+        fpath)))
+
+(defun mu4e-view-save-attachment-single (&optional msg attnum)
+  "Save attachment number ATTNUM from MSG.
+If MSG is nil use the message returned by `message-at-point'.
+If ATTNUM is nil ask for the attachment number."
+  (interactive)
+  (let* ((msg (or msg (mu4e-message-at-point)))
+	  (attnum (or attnum
+		    (mu4e~view-get-attach-num "Attachment to save" msg)))
+	  (att (mu4e~view-get-attach msg attnum))
+	  (fname  (plist-get att :name))
+	  (mtype  (plist-get att :mime-type))
+	  (path (concat
+		  (mu4e~get-attachment-dir fname mtype) "/"))
+	  (index (plist-get att :index))
+	  (retry t) (fpath))
+    (while retry
+      (setq fpath (mu4e~view-request-attachment-path fname path))
+      (setq retry
+	(and (file-exists-p fpath)
+	  (not (y-or-n-p (mu4e-format "Overwrite '%s'?" fpath))))))
+    (mu4e~proc-extract
+      'save (mu4e-message-field msg :docid)
+      index mu4e-decryption-policy fpath)))
+
+
+(defun mu4e-view-save-attachment-multi (&optional msg)
+  "Offer to save multiple email attachments from the current message.
+Default is to save all messages, [1..n], where n is the number of
+attachments.  You can type multiple values separated by space, e.g.
+  1 3-6 8
+will save attachments 1,3,4,5,6 and 8.
+
+Furthermore, there is a shortcut \"a\" which so means all
+attachments, but as this is the default, you may not need it."
+  (interactive)
+  (let* ((msg (or msg (mu4e-message-at-point)))
+         (attachstr (mu4e~view-get-attach-num
+                     "Attachment number range (or 'a' for 'all')" msg t))
+         (count (hash-table-count mu4e~view-attach-map))
+         (attachnums (mu4e-split-ranges-to-numbers attachstr count)))
+    (if mu4e-save-multiple-attachments-without-asking
+        (let* ((path (concat (mu4e~get-attachment-dir) "/"))
+               (attachdir (mu4e~view-request-attachments-dir path)))
+          (dolist (num attachnums)
+            (let* ((att (mu4e~view-get-attach msg num))
+                   (fname  (plist-get att :name))
+                   (index (plist-get att :index))
+                   (retry t)
+		   fpath)
+              (while retry
+                (setq fpath (expand-file-name (concat attachdir fname) path))
+                (setq retry
+                      (and (file-exists-p fpath)
+			(not (y-or-n-p
+			       (mu4e-format "Overwrite '%s'?" fpath))))))
+              (mu4e~proc-extract
+		'save (mu4e-message-field msg :docid)
+		index mu4e-decryption-policy fpath))))
+      (dolist (num attachnums)
+        (mu4e-view-save-attachment-single msg num)))))
+
+(defun mu4e-view-save-attachment (&optional multi)
+  "Offer to save attachment(s).
+If MULTI (prefix-argument) is nil, save a single one, otherwise,
+offer to save a range of attachments."
+  (interactive "P")
+  (if multi
+    (mu4e-view-save-attachment-multi)
+    (mu4e-view-save-attachment-single)))
+
+(defun mu4e-view-open-attachment (&optional msg attnum)
+  "Open attachment number ATTNUM from MSG.
+If MSG is nil use the message returned by `message-at-point'.
+If ATTNUM is nil ask for the attachment number."
+  (interactive)
+  (let* ((msg (or msg (mu4e-message-at-point)))
+	  (attnum (or attnum
+		    (mu4e~view-get-attach-num "Attachment to open" msg)))
+	  (att (or (mu4e~view-get-attach msg attnum)))
+	  (index (plist-get att :index))
+	  (docid (mu4e-message-field msg :docid))
+	  (mimetype (plist-get att :mime-type)))
+    (if (and mimetype (string= mimetype "message/rfc822"))
+      ;; special handling for message-attachments; we open them in mu4e. we also
+      ;; send the docid as parameter (4th arg); we'll get this back from the
+      ;; server, and use it to determine the parent message (ie., the current
+      ;; message) when showing the embedded message/rfc822, and return to the
+      ;; current message when quitting that one.
+      (mu4e~view-temp-action docid index "mu4e" docid)
+      ;; otherwise, open with the default program (handled in mu-server
+      (mu4e~proc-extract 'open docid index mu4e-decryption-policy))))
+
+
+(defun mu4e~view-temp-action (docid index what &optional param)
+  "Open attachment INDEX for message with DOCID, and invoke ACTION."
+  (interactive)
+  (mu4e~proc-extract 'temp docid index mu4e-decryption-policy nil what param ))
+
+(defvar mu4e~view-open-with-hist nil "History list for the open-with argument.")
+
+(defun mu4e-view-open-attachment-with (msg attachnum &optional cmd)
+  "Open MSG's attachment ATTACHNUM with CMD.
+If CMD is nil, ask user for it."
+  (interactive)
+  (let* ((att (mu4e~view-get-attach msg attachnum))
+	  (cmd (or cmd
+		 (read-string
+		   (mu4e-format "Shell command to open it with: ")
+		   nil 'mu4e~view-open-with-hist)))
+	  (index (plist-get att :index)))
+    (mu4e~view-temp-action
+      (mu4e-message-field msg :docid) index "open-with" cmd)))
+
+(defvar mu4e~view-pipe-hist nil
+  "History list for the pipe argument.")
+
+(defun mu4e-view-pipe-attachment (msg attachnum &optional pipecmd)
+  "Feed MSG's attachment ATTACHNUM through pipe PIPECMD.
+If PIPECMD is nil, ask user for it."
+  (interactive)
+  (let* ((att (mu4e~view-get-attach msg attachnum))
+	  (pipecmd (or pipecmd
+		     (read-string
+		       (mu4e-format "Pipe: ")
+		       nil
+		       'mu4e~view-pipe-hist)))
+	  (index (plist-get att :index)))
+    (mu4e~view-temp-action
+      (mu4e-message-field msg :docid) index "pipe" pipecmd)))
+
+
+(defun mu4e-view-open-attachment-emacs (msg attachnum)
+  "Open MSG's attachment ATTACHNUM in the current emacs instance."
+  (interactive)
+  (let* ((att (mu4e~view-get-attach msg attachnum))
+	  (index (plist-get att :index)))
+    (mu4e~view-temp-action (mu4e-message-field msg :docid) index "emacs")))
+
+(defun mu4e-view-import-attachment-diary (msg attachnum)
+  "Open MSG's attachment ATTACHNUM in the current emacs instance."
+  (interactive)
+  (let* ((att (mu4e~view-get-attach msg attachnum))
+	  (index (plist-get att :index)))
+    (mu4e~view-temp-action (mu4e-message-field msg :docid) index "diary")))
+
+(defun mu4e-view-attachment-action (&optional msg)
+  "Ask user what to do with attachments in MSG
+If MSG is nil use the message returned by `message-at-point'.
+The actions are specified in `mu4e-view-attachment-actions'."
+  (interactive)
+  (let* ((msg (or msg (mu4e-message-at-point)))
+	  (actionfunc (mu4e-read-option
+			"Action on attachment: "
+			mu4e-view-attachment-actions))
+	  (attnum (mu4e~view-get-attach-num "Which attachment" msg)))
+    (when (and actionfunc attnum)
+      (funcall actionfunc msg attnum))))
+
+;; handler-function to handle the response we get from the server when we
+;; want to do something with one of the attachments.
+(defun mu4e~view-temp-handler (path what docid param)
+  "Handler function for doing things with temp files (ie.,
+attachments) in response to a (mu4e~proc-extract 'temp ... )."
+  (cond
+    ((string= what "open-with")
+      ;; 'param' will be the program to open-with
+      (start-process "*mu4e-open-with-proc*" "*mu4e-open-with*" param path))
+    ((string= what "pipe")
+      ;; 'param' will be the pipe command, path the infile for this
+      (mu4e-process-file-through-pipe path param))
+    ;; if it's mu4e, it's some embedded message; 'param' may contain the docid
+    ;; of the parent message.
+    ((string= what "mu4e")
+      ;; remember the mapping path->docid, which maps the path of the embedded
+      ;; message to the docid of its parent
+      (puthash path docid mu4e~path-parent-docid-map)
+      (mu4e~proc-view-path path mu4e-view-show-images mu4e-decryption-policy))
+    ((string= what "emacs")
+      (find-file path)
+      ;; make the buffer read-only since it usually does not make
+      ;; sense to edit the temp buffer; use C-x C-q if you insist...
+      (setq buffer-read-only t))
+    ((string= what "diary")
+     (icalendar-import-file path diary-file))
+    (t (mu4e-error "Unsupported action %S" what))))
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(defun mu4e-view-mark-custom ()
+  "Run some custom mark function."
+  (mu4e~view-in-headers-context
+    (mu4e-headers-mark-custom)))
+
+(defun mu4e~view-split-view-p ()
+  "Return t if we're in split-view, nil otherwise."
+  (member mu4e-split-view '(horizontal vertical)))
+
+(defun mu4e-view-scroll-up-or-next ()
+  "Scroll-up the current message.
+If `mu4e-view-scroll-to-next' is non-nil, and we can't scroll-up
+anymore, go the next message."
+  (interactive)
+  (condition-case nil
+    (scroll-up)
+    (error
+      (when mu4e-view-scroll-to-next
+	(mu4e-view-headers-next)))))
+
+(defun mu4e-scroll-up ()
+  "Scroll text of selected window up one line."
+  (interactive)
+  (scroll-up 1))
+
+(defun mu4e-scroll-down ()
+  "Scroll text of selected window down one line."
+  (interactive)
+  (scroll-down 1))
+
+(defun mu4e-view-unmark-all ()
+  "If we're in split-view, unmark all messages.
+Otherwise, warn user that unmarking only works in the header
+list."
+  (interactive)
+  (if (mu4e~view-split-view-p)
+    (mu4e~view-in-headers-context (mu4e-mark-unmark-all))
+    (mu4e-message "Unmarking needs to be done in the header list view")))
+
+(defun mu4e-view-unmark ()
+  "If we're in split-view, unmark message at point.
+Otherwise, warn user that unmarking only works in the header
+list."
+  (interactive)
+  (if (mu4e~view-split-view-p)
+    (mu4e-view-mark-for-unmark)
+    (mu4e-message "Unmarking needs to be done in the header list view")))
+
+
+(defmacro mu4e~view-defun-mark-for (mark)
+  "Define a function mu4e-view-mark-for-MARK."
+  (let ((funcname (intern (format "mu4e-view-mark-for-%s" mark)))
+	(docstring (format "Mark the current message for %s." mark)))
+    `(progn
+       (defun ,funcname () ,docstring
+	 (interactive)
+	 (mu4e~view-in-headers-context
+	  (mu4e-headers-mark-and-next ',mark)))
+       (put ',funcname 'definition-name ',mark))))
+
+(mu4e~view-defun-mark-for move)
+(mu4e~view-defun-mark-for trash)
+(mu4e~view-defun-mark-for refile)
+(mu4e~view-defun-mark-for delete)
+(mu4e~view-defun-mark-for flag)
+(mu4e~view-defun-mark-for unflag)
+(mu4e~view-defun-mark-for unmark)
+(mu4e~view-defun-mark-for something)
+(mu4e~view-defun-mark-for read)
+(mu4e~view-defun-mark-for unread)
+
+(defun mu4e-view-marked-execute ()
+  "Execute the marks."
+  (interactive)
+  (mu4e~view-in-headers-context
+    (mu4e-mark-execute-all)))
+
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; URL handling
+(defun mu4e~view-get-urls-num (prompt &optional multi)
+  "Ask the user with PROMPT for an URL number for MSG, and ensure
+it is valid. The number is [1..n] for URLs \[0..(n-1)] in the
+message. If MULTI is nil, return the number for the URL;
+otherwise (MULTI is non-nil), accept ranges of URL numbers, as
+per `mu4e-split-ranges-to-numbers', and return the corresponding
+string."
+  (let* ((count (hash-table-count mu4e~view-link-map)) (def))
+    (when (zerop count) (mu4e-error "No links for this message"))
+    (if (not multi)
+      (if (= count 1)
+	(read-number (mu4e-format "%s: " prompt) 1)
+	(read-number (mu4e-format "%s (1-%d): " prompt count)))
+      (progn
+	(setq def (if (= count 1) "1" (format "1-%d" count)))
+	(read-string (mu4e-format "%s (default %s): " prompt def)
+	  nil nil def)))))
+
+(defun mu4e-view-go-to-url (&optional multi)
+  "Offer to go to url(s). If MULTI (prefix-argument) is nil, go to
+a single one, otherwise, offer to go to a range of urls."
+  (interactive "P")
+  (mu4e~view-handle-urls "URL to visit"
+    multi (lambda (url) (mu4e~view-browse-url-from-binding url))))
+
+(defun mu4e-view-save-url (&optional multi)
+  "Offer to save urls(s) to the kill-ring. If
+MULTI (prefix-argument) is nil, save a single one, otherwise, offer
+to save a range of URLs."
+  (interactive "P")
+  (mu4e~view-handle-urls "URL to save" multi
+    (lambda (url)
+      (kill-new url)
+      (mu4e-message "Saved %s to the kill-ring" url))))
+
+(defun mu4e-view-fetch-url (&optional multi)
+  "Offer to fetch (download) urls(s). If MULTI (prefix-argument) is nil,
+download a single one, otherwise, offer to fetch a range of
+URLs. The urls are fetched to `mu4e-attachment-dir'."
+  (interactive "P")
+  (mu4e~view-handle-urls "URL to fetch" multi
+    (lambda (url)
+      (let ((target (concat (mu4e~get-attachment-dir url) "/"
+		      (file-name-nondirectory url))))
+	(url-copy-file url target)
+      (mu4e-message "Fetched %s -> %s" url target)))))
+
+(defun mu4e~view-handle-urls (prompt multi urlfunc)
+  "If MULTI is nil, apply URLFUNC to a single uri, otherwise, apply
+it to a range of uris. PROMPT is the query to present to the user."
+  (interactive "P")
+  (if multi
+    (mu4e~view-handle-multi-urls prompt urlfunc)
+    (mu4e~view-handle-single-url prompt urlfunc)))
+
+(defun mu4e~view-handle-single-url (prompt urlfunc &optional num)
+  "Apply URLFUNC to url NUM in the current message, prompting the
+user with PROMPT."
+  (interactive)
+  (let* ((num (or num (mu4e~view-get-urls-num prompt)))
+         (url (gethash num mu4e~view-link-map)))
+    (unless url (mu4e-warn "Invalid number for URL"))
+    (funcall urlfunc url)))
+
+(defun mu4e~view-handle-multi-urls (prompt urlfunc)
+  "Apply URLFUNC to a a range of urls in the current message,
+prompting the user with PROMPT.
+
+Default is to aplly it to all URLs, [1..n], where n is the number
+of urls. You can type multiple values separated by space, e.g.  1
+3-6 8 will visit urls 1,3,4,5,6 and 8.
+
+Furthermore, there is a shortcut \"a\" which means all urls, but as
+this is the default, you may not need it."
+  (interactive)
+  (let* ((linkstr (mu4e~view-get-urls-num
+		      "URL number range (or 'a' for 'all')" t))
+	  (count (hash-table-count mu4e~view-link-map))
+	  (linknums (mu4e-split-ranges-to-numbers linkstr count)))
+    (dolist (num linknums)
+      (mu4e~view-handle-single-url prompt urlfunc num))))
+
+(defun mu4e-view-for-each-uri (func)
+  "Execute FUNC (which receives a uri) for each uri in the current
+  message."
+  (maphash (lambda (num uri) (funcall func uri)) mu4e~view-link-map))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(defconst mu4e~view-raw-buffer-name " *mu4e-raw-view*"
+  "*internal* Name for the raw message view buffer")
+
+(defun mu4e-view-raw-message ()
+  "Display the raw contents of message at point in a new buffer."
+  (interactive)
+  (let ((path (mu4e-message-field-at-point :path))
+	 (buf (get-buffer-create mu4e~view-raw-buffer-name)))
+    (unless (and path (file-readable-p path))
+      (mu4e-error "Not a readable file: %S" path))
+    (with-current-buffer buf
+      (let ((inhibit-read-only t))
+	(erase-buffer)
+	(insert-file-contents path)
+	(view-mode)
+	(goto-char (point-min))))
+    (switch-to-buffer buf)))
+
+(defun mu4e-view-pipe (cmd)
+  "Pipe the message at point through shell command CMD, and display
+the results."
+  (interactive "sShell command: ")
+  (let ((path (mu4e-message-field (mu4e-message-at-point) :path)))
+    (mu4e-process-file-through-pipe path cmd)))
+
+(defconst mu4e~verify-buffer-name " *mu4e-verify*")
+
+(defun mu4e-view-verify-msg-popup (&optional msg)
+  "Pop-up a little signature verification window for (optional) MSG
+or message-at-point."
+  (interactive)
+  (let* ((msg (or msg (mu4e-message-at-point)))
+	  (path (mu4e-message-field msg :path))
+	  (cmd (format "%s verify --verbose %s %s"
+		 mu4e-mu-binary
+		 (shell-quote-argument path)
+		 (if mu4e-decryption-policy
+		     "--decrypt --use-agent"
+		     "")))
+	  (output (shell-command-to-string cmd))
+	    ;; create a new one
+	  (buf (get-buffer-create mu4e~verify-buffer-name))
+	  (win (or (get-buffer-window buf)
+		 (split-window-vertically (- (window-height) 6)))))
+    (with-selected-window win
+      (let ((inhibit-read-only t))
+	;; (set-window-dedicated-p win t)
+	(switch-to-buffer buf)
+	(erase-buffer)
+	(insert output)
+	(goto-char (point-min))
+	(local-set-key "q" 'kill-buffer-and-window))
+      (setq buffer-read-only t))
+    (select-window win)))
+
+
+(defun mu4e~view-quit-buffer ()
+  "Quit the mu4e-view buffer.
+This is a rather complex function, to ensure we don't disturb
+other windows."
+  (interactive)
+  (unless (eq major-mode 'mu4e-view-mode)
+    (mu4e-error "Must be in mu4e-view-mode (%S)" major-mode))
+  (let ((curbuf (current-buffer)) (curwin (selected-window))
+	 (headers-win))
+    (walk-windows
+      (lambda (win)
+	;; check whether the headers buffer window is visible
+	(when (eq mu4e~view-headers-buffer (window-buffer win))
+	  (setq headers-win win))
+	;; and kill any _other_ (non-selected) window that shows the current
+	;; buffer
+	(when
+	  (and
+	    (eq curbuf (window-buffer win)) ;; does win show curbuf?
+	    (not (eq curwin win))	    ;; but it's not the curwin?
+	    (not (one-window-p))) ;; and not the last one on the frame?
+	  (delete-window win))))  ;; delete it!
+    ;; now, all *other* windows should be gone.
+    ;; if the headers view is also visible, kill ourselves + window; otherwise
+    ;; switch to the headers view
+    (if (window-live-p headers-win)
+      ;; headers are visible
+      (progn
+	(kill-buffer-and-window) ;; kill the view win
+        (setq mu4e~headers-view-win nil)
+	(select-window headers-win)) ;; and switch to the headers win...
+      ;; headers are not visible...
+      (progn
+	(kill-buffer)
+        (setq mu4e~headers-view-win nil)
+	(when (buffer-live-p mu4e~view-headers-buffer)
+	  (switch-to-buffer mu4e~view-headers-buffer))))))
+
+(provide 'mu4e-view)
+;; end of mu4e-view