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- ;;; Thread support for VM
- ;;; Copyright (C) 1994 Kyle E. Jones
- ;;;
- ;;; This program 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 1, or (at your option)
- ;;; any later version.
- ;;;
- ;;; This program 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 this program; if not, write to the Free Software
- ;;; Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
-
- (provide 'vm-thread)
-
- (defun vm-toggle-threads-display ()
- "Toggle the threads display on and off.
- When the threads display is on, the folder will be sorted by
- thread and thread indentation (via the %I summary format specifier)
- will be visible."
- (interactive)
- (vm-select-folder-buffer)
- (vm-check-for-killed-summary)
- (vm-set-summary-redo-start-point t)
- (setq vm-summary-show-threads (not vm-summary-show-threads))
- (if vm-summary-show-threads
- (vm-sort-messages "thread")
- (vm-sort-messages "physical-order")))
-
- (defun vm-build-threads (message-list)
- (if (null vm-thread-obarray)
- (setq vm-thread-obarray (make-vector 641 0)
- vm-thread-subject-obarray (make-vector 641 0)))
- (let ((mp (or message-list vm-message-list))
- (n 0)
- ;; Just for laughs, make the update interval vary.
- (modulus (+ (% (vm-abs (random)) 11) 40))
- ;; no need to schedule reindents of reparented messages
- ;; unless there were already messages present.
- (schedule-reindents message-list)
- m parent parent-sym id id-sym date refs old-parent-sym)
- (while mp
- (setq m (car mp)
- parent (vm-th-parent m)
- id (vm-su-message-id m)
- id-sym (intern id vm-thread-obarray)
- date (vm-so-sortable-datestring m))
- (put id-sym 'messages (cons m (get id-sym 'messages)))
- (if (and (null (cdr (get id-sym 'messages)))
- schedule-reindents)
- (vm-thread-mark-for-summary-update (get id-sym 'children)))
- (if parent
- (progn
- (setq parent-sym (intern parent vm-thread-obarray))
- (cond ((or (not (boundp id-sym))
- (null (symbol-value id-sym))
- (eq (symbol-value id-sym) parent-sym))
- (set id-sym parent-sym))
- (t
- (setq old-parent-sym (symbol-value id-sym))
- (put old-parent-sym 'children
- (let ((kids (get old-parent-sym 'children))
- (msgs (get id-sym 'messages)))
- (while msgs
- (setq kids (delq m kids)
- msgs (cdr msgs)))
- kids ))
- (set id-sym parent-sym)
- (if schedule-reindents
- (vm-thread-mark-for-summary-update
- (get id-sym 'messages)))))
- (put parent-sym 'children
- (cons m (get parent-sym 'children))))
- (if (not (boundp id-sym))
- (set id-sym nil)))
- ;; use the references header to set parenting information
- ;; for ancestors of this message. This does not override
- ;; a parent pointer for a message if it already exists.
- (if (cdr (setq refs (vm-th-references m)))
- (let (parent-sym id-sym msgs)
- (setq parent-sym (intern (car refs) vm-thread-obarray)
- refs (cdr refs))
- (while refs
- (setq id-sym (intern (car refs) vm-thread-obarray))
- (if (and (boundp id-sym) (symbol-value id-sym))
- nil
- (set id-sym parent-sym)
- (if (setq msgs (get id-sym 'messages))
- (put parent-sym 'children
- (append msgs (get parent-sym 'children))))
- (if schedule-reindents
- (vm-thread-mark-for-summary-update msgs)))
- (setq parent-sym id-sym
- refs (cdr refs)))))
- (if vm-thread-using-subject
- ;; inhibit-quit because we need to make sure the asets
- ;; below are an atomic group.
- (let* ((inhibit-quit t)
- (subject (vm-so-sortable-subject m))
- (subject-sym (intern subject vm-thread-subject-obarray)))
- ;; if this subject never seen before create the
- ;; information vector.
- (if (not (boundp subject-sym))
- (set subject-sym
- (vector id-sym (vm-so-sortable-datestring m)
- nil (list m)))
- ;; this subject seen before
- (aset (symbol-value subject-sym) 3
- (cons m (aref (symbol-value subject-sym) 3)))
- (if (string< date (aref (symbol-value subject-sym) 1))
- (let* ((vect (symbol-value subject-sym))
- (i-sym (aref vect 0)))
- ;; optimization: if we know that this message
- ;; already has a parent, then don't bother
- ;; adding it to the list of child messages
- ;; since we know that it will be threaded and
- ;; unthreaded using the parent information.
- (if (or (not (boundp i-sym))
- (null (symbol-value i-sym)))
- (aset vect 2 (append (get i-sym 'messages)
- (aref vect 2))))
- (aset vect 0 id-sym)
- (aset vect 1 date)
- ;; this loops _and_ recurses and I'm worried
- ;; about it going into a spin someday. So I
- ;; unblock interrupts here. It's not critical
- ;; that it finish... the summary will just be out
- ;; of sync.
- (if schedule-reindents
- (let ((inhibit-quit nil))
- (vm-thread-mark-for-summary-update (aref vect 2)))))
- ;; optimization: if we know that this message
- ;; already has a parent, then don't bother adding
- ;; it to the list of child messages, since we
- ;; know that it will be threaded and unthreaded
- ;; using the parent information.
- (if (null parent)
- (aset (symbol-value subject-sym) 2
- (cons m (aref (symbol-value subject-sym) 2))))))))
- (setq mp (cdr mp) n (1+ n))
- (if (zerop (% n modulus))
- (message "Building threads... %d" n)))
- (if (> n modulus)
- (message "Building threads... done"))))
-
- (defun vm-thread-mark-for-summary-update (message-list)
- (let (m)
- (while message-list
- (setq m (car message-list))
- ;; if thread-list is null then we've already marked this
- ;; message, or it doesn't need marking.
- (if (null (vm-thread-list-of m))
- nil
- (vm-mark-for-summary-update m t)
- (vm-set-thread-list-of m nil)
- (vm-set-thread-indentation-of m nil)
- (vm-thread-mark-for-summary-update
- (get (intern (vm-su-message-id m) vm-thread-obarray)
- 'children)))
- (setq message-list (cdr message-list)))))
-
- (defun vm-thread-list (message)
- (let ((done nil)
- (m message)
- thread-list id-sym subject-sym loop-sym root-date)
- (save-excursion
- (set-buffer (vm-buffer-of m))
- (setq id-sym (intern (vm-su-message-id m) vm-thread-obarray)
- thread-list (list id-sym))
- (fillarray vm-thread-loop-obarray 0)
- (while (not done)
- (setq loop-sym (intern (symbol-name id-sym) vm-thread-loop-obarray))
- (if (boundp loop-sym)
- ;; loop detected, bail...
- (setq done t)
- (set loop-sym t)
- (if (and (boundp id-sym) (symbol-value id-sym))
- (progn
- (setq id-sym (symbol-value id-sym)
- thread-list (cons id-sym thread-list)
- m (car (get id-sym 'messages))))
- (if (null m)
- (setq done t)
- (if (null vm-thread-using-subject)
- nil
- (setq subject-sym
- (intern (vm-so-sortable-subject m)
- vm-thread-subject-obarray))
- (if (or (not (boundp subject-sym))
- (eq (aref (symbol-value subject-sym) 0) id-sym))
- (setq done t)
- (setq id-sym (aref (symbol-value subject-sym) 0)
- thread-list (cons id-sym thread-list)
- m (car (get id-sym 'messages)))))))))
- ;; save the date of the oldest message in this thread
- (setq root-date (get id-sym 'oldest-date))
- (if (or (null root-date)
- (string< (vm-so-sortable-datestring message) root-date))
- (put id-sym 'oldest-date (vm-so-sortable-datestring message)))
- thread-list )))
-
- ;; remove message struct from thread data.
- ;;
- ;; optional second arg non-nil means forget information that
- ;; might be different if the message contents changed.
- ;;
- ;; message must be a real (non-virtual) message
- (defun vm-unthread-message (message &optional message-changing)
- (save-excursion
- (let ((mp (cons message (vm-virtual-messages-of message)))
- m id-sym subject-sym vect p-sym)
- (while mp
- (setq m (car mp))
- (let ((inhibit-quit t))
- (vm-set-thread-list-of m nil)
- (vm-set-thread-indentation-of m nil)
- (set-buffer (vm-buffer-of m))
- (setq id-sym (intern (vm-su-message-id m) vm-thread-obarray)
- subject-sym (intern (vm-so-sortable-subject m)
- vm-thread-subject-obarray))
- (if (boundp id-sym)
- (progn
- (put id-sym 'messages (delq m (get id-sym 'messages)))
- (vm-thread-mark-for-summary-update (get id-sym 'children))
- (setq p-sym (symbol-value id-sym))
- (and p-sym (put p-sym 'children
- (delq m (get p-sym 'children))))
- (if message-changing
- (set id-sym nil))))
- (if (and (boundp subject-sym) (setq vect (symbol-value subject-sym)))
- (if (not (eq id-sym (aref vect 0)))
- (aset vect 2 (delq m (aref vect 2)))
- (if message-changing
- (if (null (cdr (aref vect 3)))
- (makunbound subject-sym)
- (let ((p (aref vect 3))
- oldest-msg oldest-date children)
- (setq oldest-msg (car p)
- oldest-date (vm-so-sortable-datestring (car p))
- p (cdr p))
- (while p
- (if (and (string-lessp (vm-so-sortable-datestring (car p))
- oldest-date)
- (not (eq m (car p))))
- (setq oldest-msg (car p)
- oldest-date (vm-so-sortable-datestring (car p))))
- (setq p (cdr p)))
- (aset vect 0 (intern (vm-su-message-id oldest-msg)
- vm-thread-obarray))
- (aset vect 1 oldest-date)
- (setq children (delq oldest-msg (aref vect 2)))
- (aset vect 2 children)
- (aset vect 3 (delq m (aref vect 3)))
- ;; I'm not sure there aren't situations
- ;; where this might loop forever.
- (let ((inhibit-quit nil))
- (vm-thread-mark-for-summary-update children))))))))
- (setq mp (cdr mp))))))
-
- (defun vm-th-references (m)
- (or (vm-references-of m)
- (vm-set-references-of
- m
- (let (references)
- (setq references (vm-get-header-contents m "References:" " "))
- (and references (vm-parse references "[^<]*\\(<[^>]+>\\)"))))))
-
- (defun vm-th-parent (m)
- (or (vm-parent-of m)
- (vm-set-parent-of
- m
- (or (car (vm-last (vm-th-references m)))
- (let (in-reply-to)
- (setq in-reply-to (vm-get-header-contents m "In-Reply-To:" " "))
- (and in-reply-to
- (car (vm-parse in-reply-to "[^<]*\\(<[^>]+>\\)"))))))))
-
- (defun vm-th-thread-indentation (m)
- (or (vm-thread-indentation-of m)
- (let ((p (vm-th-thread-list m)))
- (while (and p (null (get (car p) 'messages)))
- (setq p (cdr p)))
- (vm-set-thread-indentation-of m (1- (length p)))
- (vm-thread-indentation-of m))))
-
- (defun vm-th-thread-list (m)
- (or (vm-thread-list-of m)
- (progn
- (vm-set-thread-list-of m (vm-thread-list m))
- (vm-thread-list-of m))))
-