+(defvar notmuch-show-signature-lines-max 6
+ "Maximum length of signature that will be hidden by default.")
+
+(set 'notmuch-show-message-begin-regexp "\fmessage{")
+(set 'notmuch-show-message-end-regexp "\fmessage}")
+(set 'notmuch-show-header-begin-regexp "\fheader{")
+(set 'notmuch-show-header-end-regexp "\fheader}")
+(set 'notmuch-show-body-begin-regexp "\fbody{")
+(set 'notmuch-show-body-end-regexp "\fbody}")
+(set 'notmuch-show-attachment-begin-regexp "\fattachment{")
+(set 'notmuch-show-attachment-end-regexp "\fattachment}")
+(set 'notmuch-show-part-begin-regexp "\fpart{")
+(set 'notmuch-show-part-end-regexp "\fpart}")
+(set 'notmuch-show-marker-regexp "\f\\(message\\|header\\|body\\|attachment\\|part\\)[{}].*$")
+
+(set 'notmuch-show-id-regexp "\\(id:[^ ]*\\)")
+(set 'notmuch-show-filename-regexp "filename:\\(.*\\)$")
+(set 'notmuch-show-tags-regexp "(\\([^)]*\\))$")
+
+; XXX: This should be a generic function in emacs somewhere, not here
+(defun point-invisible-p ()
+ "Return whether the character at point is invisible.
+
+Here visibility is determined by `buffer-invisibility-spec' and
+the invisible property of any overlays for point. It doesn't have
+anything to do with whether point is currently being displayed
+within the current window."
+ (let ((prop (get-char-property (point) 'invisible)))
+ (if (eq buffer-invisibility-spec t)
+ prop
+ (or (memq prop buffer-invisibility-spec)
+ (assq prop buffer-invisibility-spec)))))
+
+(defun notmuch-show-next-line ()
+ "Like builtin `next-line' but ensuring we end on a visible character.
+
+By advancing forward until reaching a visible character.
+
+Unlike builtin `next-line' this version accepts no arguments."
+ (interactive)
+ (set 'this-command 'next-line)
+ (call-interactively 'next-line)
+ (while (point-invisible-p)
+ (forward-char)))
+
+(defun notmuch-show-previous-line ()
+ "Like builtin `previous-line' but ensuring we end on a visible character.
+
+By advancing forward until reaching a visible character.
+
+Unlike builtin `next-line' this version accepts no arguments."
+ (interactive)
+ (set 'this-command 'previous-line)
+ (call-interactively 'previous-line)
+ (while (point-invisible-p)
+ (forward-char)))
+
+(defun notmuch-show-get-message-id ()
+ (save-excursion
+ (beginning-of-line)
+ (if (not (looking-at notmuch-show-message-begin-regexp))
+ (re-search-backward notmuch-show-message-begin-regexp))
+ (re-search-forward notmuch-show-id-regexp)
+ (buffer-substring (match-beginning 1) (match-end 1))))
+
+(defun notmuch-show-get-filename ()
+ (save-excursion
+ (beginning-of-line)
+ (if (not (looking-at notmuch-show-message-begin-regexp))
+ (re-search-backward notmuch-show-message-begin-regexp))
+ (re-search-forward notmuch-show-filename-regexp)
+ (buffer-substring (match-beginning 1) (match-end 1))))
+
+(defun notmuch-show-set-tags (tags)
+ (save-excursion
+ (beginning-of-line)
+ (if (not (looking-at notmuch-show-message-begin-regexp))
+ (re-search-backward notmuch-show-message-begin-regexp))
+ (re-search-forward notmuch-show-tags-regexp)
+ (let ((inhibit-read-only t)
+ (beg (match-beginning 1))
+ (end (match-end 1)))
+ (delete-region beg end)
+ (goto-char beg)
+ (insert (mapconcat 'identity tags " ")))))
+
+(defun notmuch-show-get-tags ()
+ (save-excursion
+ (beginning-of-line)
+ (if (not (looking-at notmuch-show-message-begin-regexp))
+ (re-search-backward notmuch-show-message-begin-regexp))
+ (re-search-forward notmuch-show-tags-regexp)
+ (split-string (buffer-substring (match-beginning 1) (match-end 1)))))
+
+(defun notmuch-show-add-tag (&rest toadd)
+ "Add a tag to the current message."
+ (interactive "sTag to add: ")
+ (apply 'notmuch-call-notmuch-process
+ (append (cons "tag"
+ (mapcar (lambda (s) (concat "+" s)) toadd))
+ (cons (notmuch-show-get-message-id) nil)))
+ (notmuch-show-set-tags (sort (union toadd (notmuch-show-get-tags) :test 'string=) 'string<)))
+
+(defun notmuch-show-remove-tag (&rest toremove)
+ "Remove a tag from the current message."
+ (interactive "sTag to remove: ")
+ (let ((tags (notmuch-show-get-tags)))
+ (if (intersection tags toremove :test 'string=)
+ (progn
+ (apply 'notmuch-call-notmuch-process
+ (append (cons "tag"
+ (mapcar (lambda (s) (concat "-" s)) toremove))
+ (cons (notmuch-show-get-message-id) nil)))
+ (notmuch-show-set-tags (sort (set-difference tags toremove :test 'string=) 'string<))))))
+
+(defun notmuch-show-archive-thread-maybe-mark-read (markread)
+ (save-excursion
+ (goto-char (point-min))
+ (while (not (eobp))
+ (if markread
+ (notmuch-show-remove-tag "unread" "inbox")
+ (notmuch-show-remove-tag "inbox"))
+ (if (not (eobp))
+ (forward-char))
+ (if (not (re-search-forward notmuch-show-message-begin-regexp nil t))
+ (goto-char (point-max)))))
+ (let ((parent-buffer notmuch-show-parent-buffer))
+ (kill-this-buffer)
+ (if parent-buffer
+ (progn
+ (switch-to-buffer parent-buffer)
+ (forward-line)
+ (notmuch-search-show-thread)))))
+
+(defun notmuch-show-mark-read-then-archive-thread ()
+ "Remove \"unread\" tag from each message, then archive and show next thread.
+
+Archive each message currrently shown by removing the \"unread\"
+and \"inbox\" tag from each. Then kill this buffer and show the
+next thread from the search from which this thread was originally
+shown.
+
+Note: This command is safe from any race condition of new messages
+being delivered to the same thread. It does not archive the
+entire thread, but only the messages shown in the current
+buffer."
+ (interactive)
+ (notmuch-show-archive-thread-maybe-mark-read t))
+
+(defun notmuch-show-archive-thread ()
+ "Archive each message in thread, and show next thread from search.
+
+Archive each message currrently shown by removing the \"inbox\"
+tag from each. Then kill this buffer and show the next thread
+from the search from which this thread was originally shown.
+
+Note: This command is safe from any race condition of new messages
+being delivered to the same thread. It does not archive the
+entire thread, but only the messages shown in the current
+buffer."
+ (interactive)
+ (notmuch-show-archive-thread-maybe-mark-read nil))
+
+(defun notmuch-show-view-raw-message ()
+ "View the raw email of the current message."
+ (interactive)
+ (view-file (notmuch-show-get-filename)))
+
+(defun notmuch-show-reply ()
+ "Begin composing a reply to the current message in a new buffer."
+ (interactive)
+ (view-file (notmuch-show-get-filename))
+ (let ((buf (current-buffer)))
+ (message-reply)
+ (kill-buffer buf)))
+
+(defun notmuch-show-pipe-message (command)
+ "Pipe the contents of the current message to the given command.
+
+The given command will be executed with the raw contents of the
+current email message as stdin. Anything printed by the command
+to stdout or stderr will appear in the *Messages* buffer."
+ (interactive "sPipe message to command: ")
+ (apply 'start-process-shell-command "notmuch-pipe-command" "*notmuch-pipe*" (split-string (concat command " < " (notmuch-show-get-filename)))))
+
+(defun notmuch-show-move-to-current-message-summary-line ()
+ "Move to the beginning of the one-line summary of the current message.
+
+This gives us a stable place to move to and work from since the
+summary line is always visible. This is important since moving to
+an invisible location is unreliable, (the main command loop moves
+point either forward or backward to the next visible character
+when a command ends with point on an invisible character).
+
+Emits an error if point is not within a valid message, (that is
+not pattern of `notmuch-show-message-begin-regexp' could be found
+by searching backward)."
+ (beginning-of-line)
+ (if (not (looking-at notmuch-show-message-begin-regexp))
+ (if (re-search-backward notmuch-show-message-begin-regexp nil t)
+ (forward-line 2)
+ (error "Not within a valid message."))
+ (forward-line 2)))
+
+(defun notmuch-show-last-message-p ()
+ "Predicate testing whether point is within the last message."
+ (save-window-excursion
+ (save-excursion
+ (notmuch-show-move-to-current-message-summary-line)
+ (not (re-search-forward notmuch-show-message-begin-regexp nil t)))))
+
+(defun notmuch-show-message-unread-p ()
+ "Preficate testing whether current message is unread."
+ (member "unread" (notmuch-show-get-tags)))
+
+(defun notmuch-show-next-message ()
+ "Advance to the beginning of the next message in the buffer.
+
+Moves to the last visible character of the current message if
+already on the last message in the buffer."
+ (interactive)
+ (notmuch-show-move-to-current-message-summary-line)
+ (if (re-search-forward notmuch-show-message-begin-regexp nil t)
+ (notmuch-show-move-to-current-message-summary-line)
+ (goto-char (- (point-max) 1))
+ (while (point-invisible-p)
+ (backward-char)))
+ (recenter 0))
+
+(defun notmuch-show-find-next-message ()
+ "Returns the position of the next message in the buffer.
+
+Or the position of the last visible character of the current
+message if already within the last message in the buffer."
+ ; save-excursion doesn't save our window position
+ ; save-window-excursion doesn't save point
+ ; Looks like we have to use both.
+ (save-excursion
+ (save-window-excursion
+ (notmuch-show-next-message)
+ (point))))
+
+(defun notmuch-show-next-unread-message ()
+ "Advance to the beginning of the next unread message in the buffer.
+
+Moves to the last visible character of the current message if
+there are no more unread messages past the current point."
+ (notmuch-show-next-message)
+ (while (and (not (notmuch-show-last-message-p))
+ (not (notmuch-show-message-unread-p)))
+ (notmuch-show-next-message))
+ (if (not (notmuch-show-message-unread-p))
+ (notmuch-show-next-message)))
+
+(defun notmuch-show-next-open-message ()
+ "Advance to the the next message which is not hidden.
+
+If read messages are currently hidden, advance to the next unread
+message. Otherwise, advance to the next message."
+ (if (or (memq 'notmuch-show-body-read buffer-invisibility-spec)
+ (assq 'notmuch-show-body-read buffer-invisibility-spec))
+ (notmuch-show-next-unread-message)
+ (notmuch-show-next-message)))
+
+(defun notmuch-show-previous-message ()
+ "Backup to the beginning of the previous message in the buffer.
+
+If within a message rather than at the beginning of it, then
+simply move to the beginning of the current message."
+ (interactive)
+ (let ((start (point)))
+ (notmuch-show-move-to-current-message-summary-line)
+ (if (not (< (point) start))
+ ; Go backward twice to skip the current message's marker
+ (progn
+ (re-search-backward notmuch-show-message-begin-regexp nil t)
+ (re-search-backward notmuch-show-message-begin-regexp nil t)
+ (notmuch-show-move-to-current-message-summary-line)
+ ))
+ (recenter 0)))
+
+(defun notmuch-show-find-previous-message ()
+ "Returns the position of the previous message in the buffer.
+
+Or the position of the beginning of the current message if point
+is originally within the message rather than at the beginning of
+it."
+ ; save-excursion doesn't save our window position
+ ; save-window-excursion doesn't save point
+ ; Looks like we have to use both.
+ (save-excursion
+ (save-window-excursion
+ (notmuch-show-previous-message)
+ (point))))
+
+(defun notmuch-show-mark-read-then-next-open-message ()
+ "Remove unread tag from current message, then advance to next unread message."
+ (interactive)
+ (notmuch-show-remove-tag "unread")
+ (notmuch-show-next-open-message))
+
+(defun notmuch-show-rewind ()
+ "Do reverse scrolling compared to `notmuch-show-advance-marking-read-and-archiving'
+
+Specifically, if the beginning of the previous email is fewer
+than `window-height' lines from the current point, move to it
+just like `notmuch-show-previous-message'.
+
+Otherwise, just scroll down a screenful of the current message.
+
+This command does not modify any message tags, (it does not undo
+any effects from previous calls to
+`notmuch-show-advance-marking-read-and-archiving'."
+ (interactive)
+ (let ((previous (notmuch-show-find-previous-message)))
+ (if (> (count-lines previous (point)) (- (window-height) next-screen-context-lines))
+ (progn
+ (condition-case nil
+ (scroll-down nil)
+ ((beginning-of-buffer) nil))
+ (goto-char (window-start)))
+ (notmuch-show-previous-message))))
+
+(defun notmuch-show-advance-marking-read-and-archiving ()
+ "Advance through buffer, marking read and archiving.
+
+This command is intended to be one of the simplest ways to
+process a thread of email. It does the following:
+
+If the current message in the thread is not yet fully visible,
+scroll by a near screenful to read more of the message.
+
+Otherwise, (the end of the current message is already within the
+current window), remove the \"unread\" tag (if present) from the
+current message and advance to the next open message.
+
+Finally, if there is no further message to advance to, and this
+last message is already read, then archive the entire current
+thread, (remove the \"inbox\" tag from each message). Also kill
+this buffer, and display the next thread from the search from
+which this thread was originally shown."
+ (interactive)
+ (let ((next (notmuch-show-find-next-message))
+ (unread (notmuch-show-message-unread-p)))
+ (if (> next (window-end))
+ (scroll-up nil)
+ (let ((last (notmuch-show-last-message-p)))
+ (notmuch-show-mark-read-then-next-open-message)
+ (if last
+ (notmuch-show-archive-thread))))))
+
+(defun notmuch-show-markup-citations-region (beg end)
+ (goto-char beg)
+ (beginning-of-line)
+ (while (< (point) end)
+ (let ((beg-sub (point)))
+ (if (looking-at ">")
+ (progn
+ (while (looking-at ">")
+ (forward-line))
+ (let ((overlay (make-overlay beg-sub (point))))
+ (overlay-put overlay 'invisible 'notmuch-show-citation)
+ (overlay-put overlay 'before-string
+ (concat "[" (number-to-string (count-lines beg-sub (point)))
+ "-line citation. Press 'c' to show.]\n")))))
+ (if (looking-at "--[ ]?$")
+ (let ((sig-lines (count-lines beg-sub end)))
+ (if (<= sig-lines notmuch-show-signature-lines-max)
+ (progn
+ (overlay-put (make-overlay beg-sub (+ beg-sub 1))
+ 'before-string
+ (concat "[" (number-to-string sig-lines)
+ "-line signature. Press 's' to show.]"))
+ (overlay-put (make-overlay (+ beg-sub 2) end)
+ 'invisible 'notmuch-show-signature)
+ (goto-char end)))))
+ (forward-line))))
+
+(defun notmuch-show-markup-body ()
+ (re-search-forward notmuch-show-body-begin-regexp)
+ (next-line 1)
+ (beginning-of-line)
+ (let ((beg (point)))
+ (re-search-forward notmuch-show-body-end-regexp)
+ (let ((end (match-beginning 0)))
+ (notmuch-show-markup-citations-region beg end)
+ (if (not (notmuch-show-message-unread-p))
+ (overlay-put (make-overlay beg end)
+ 'invisible 'notmuch-show-body-read)))))
+
+(defun notmuch-show-markup-header ()
+ (re-search-forward notmuch-show-header-begin-regexp)
+ (forward-line 1)
+ (beginning-of-line)
+ (let ((beg (point)))
+ (end-of-line)
+ ; Inverse video for subject
+ (overlay-put (make-overlay beg (point)) 'face '((cons :inverse-video t)))
+ (beginning-of-line)
+ (forward-line 2)
+ (set 'beg (point))
+ (re-search-forward notmuch-show-header-end-regexp)
+ (overlay-put (make-overlay beg (match-beginning 0))
+ 'invisible 'notmuch-show-header)))
+
+(defun notmuch-show-markup-message ()
+ (if (re-search-forward notmuch-show-message-begin-regexp nil t)
+ (progn
+ (notmuch-show-markup-header)
+ (notmuch-show-markup-body))
+ (goto-char (point-max))))
+
+(defun notmuch-show-hide-markers ()
+ (save-excursion
+ (goto-char (point-min))
+ (while (not (eobp))
+ (if (re-search-forward notmuch-show-marker-regexp nil t)
+ (progn
+ (overlay-put (make-overlay (match-beginning 0) (+ (match-end 0) 1))
+ 'invisible 'notmuch-show-marker))
+ (goto-char (point-max))))))
+
+(defun notmuch-show-markup-messages ()
+ (save-excursion
+ (goto-char (point-min))
+ (while (not (eobp))
+ (notmuch-show-markup-message)))
+ (notmuch-show-hide-markers))
+
+(defun notmuch-show-toggle-citations-visible ()
+ "Toggle visibility of citations"
+ (interactive)
+ (if notmuch-show-citations-visible
+ (add-to-invisibility-spec 'notmuch-show-citation)
+ (remove-from-invisibility-spec 'notmuch-show-citation))
+ (set 'notmuch-show-citations-visible (not notmuch-show-citations-visible))
+ ; Need to force the redisplay for some reason
+ (force-window-update)
+ (redisplay t))
+
+(defun notmuch-show-toggle-signatures-visible ()
+ "Toggle visibility of signatures"
+ (interactive)
+ (if notmuch-show-signatures-visible
+ (add-to-invisibility-spec 'notmuch-show-signature)
+ (remove-from-invisibility-spec 'notmuch-show-signature))
+ (set 'notmuch-show-signatures-visible (not notmuch-show-signatures-visible))
+ ; Need to force the redisplay for some reason
+ (force-window-update)
+ (redisplay t))
+
+(defun notmuch-show-toggle-headers-visible ()
+ "Toggle visibility of header fields"
+ (interactive)
+ (if notmuch-show-headers-visible
+ (add-to-invisibility-spec 'notmuch-show-header)
+ (remove-from-invisibility-spec 'notmuch-show-header))
+ (set 'notmuch-show-headers-visible (not notmuch-show-headers-visible))
+ ; Need to force the redisplay for some reason
+ (force-window-update)
+ (redisplay t))
+
+(defun notmuch-show-toggle-body-read-visible ()
+ "Toggle visibility of message bodies of read messages"
+ (interactive)
+ (if notmuch-show-body-read-visible
+ (add-to-invisibility-spec 'notmuch-show-body-read)
+ (remove-from-invisibility-spec 'notmuch-show-body-read))
+ (set 'notmuch-show-body-read-visible (not notmuch-show-body-read-visible))
+ ; Need to force the redisplay for some reason
+ (force-window-update)
+ (redisplay t))
+