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1068 lines
46 KiB
EmacsLisp
1068 lines
46 KiB
EmacsLisp
;;; mh-seq.el --- MH-E sequences support
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;; Copyright (C) 1993, 1995, 2001, 2002 Free Software Foundation, Inc.
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;; Author: Bill Wohler <wohler@newt.com>
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;; Maintainer: Bill Wohler <wohler@newt.com>
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;; Keywords: mail
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;; See: mh-e.el
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation; either version 2, or (at your option)
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;; any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs; see the file COPYING. If not, write to the
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;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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;; Boston, MA 02111-1307, USA.
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;;; Commentary:
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;;
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;; This tries to implement the algorithm described at:
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;; http://www.jwz.org/doc/threading.html
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;; It is also a start to implementing the IMAP Threading extension RFC. The
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;; implementation lacks the reference and subject canonicalization of the
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;; RFC.
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;;
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;; In the presentation buffer, children messages are shown indented with
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;; either [ ] or < > around them. Square brackets ([ ]) denote that the
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;; algorithm can point out some headers which when taken together implies
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;; that the unindented message is an ancestor of the indented message. If
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;; no such proof exists then angles (< >) are used.
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;;
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;; Some issues and problems are as follows:
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;;
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;; (1) Scan truncates the fields at length 512. So longer references:
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;; headers get mutilated. The same kind of MH format string works when
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;; composing messages. Is there a way to avoid this? My scan command
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;; is as follows:
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;; scan +folder -width 10000 \
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;; -format "%(msg)\n%{message-id}\n%{references}\n%{subject}\n"
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;; I would really appreciate it if someone would help me with this.
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;;
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;; (2) Implement heuristics to recognize message-id's in In-Reply-To:
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;; header. Right now it just assumes that the last text between angles
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;; (< and >) is the message-id. There is the chance that this will
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;; incorrectly use an email address like a message-id.
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;;
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;; (3) Error checking of found message-id's should be done.
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;;
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;; (4) Since this breaks the assumption that message indices increase as
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;; one goes down the buffer, the binary search based mh-goto-msg
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;; doesn't work. I have a simpler replacement which may be less
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;; efficient.
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;;
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;; (5) Better canonicalizing for message-id and subject strings.
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;;
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;; Internal support for MH-E package.
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;;; Change Log:
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;; $Id: mh-seq.el,v 1.71 2002/11/14 20:41:12 wohler Exp $
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;;; Code:
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(require 'cl)
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(require 'mh-e)
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;; Shush the byte-compiler
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(defvar tool-bar-mode)
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;;; Data structures (used in message threading)...
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(defstruct (mh-thread-message (:conc-name mh-message-)
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(:constructor mh-thread-make-message))
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(id nil)
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(references ())
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(subject "")
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(subject-re-p nil))
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(defstruct (mh-thread-container (:conc-name mh-container-)
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(:constructor mh-thread-make-container))
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message parent children
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(real-child-p t))
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;;; Internal variables:
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(defvar mh-last-seq-used nil
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"Name of seq to which a msg was last added.")
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(defvar mh-non-seq-mode-line-annotation nil
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"Saved value of `mh-mode-line-annotation' when narrowed to a seq.")
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;;; Maps and hashes...
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(defvar mh-thread-id-hash nil
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"Hashtable used to canonicalize message-id strings.")
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(defvar mh-thread-subject-hash nil
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"Hashtable used to canonicalize subject strings.")
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(defvar mh-thread-id-table nil
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"Thread ID table maps from message-id's to message containers.")
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(defvar mh-thread-id-index-map nil
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"Table to lookup message index number from message-id.")
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(defvar mh-thread-index-id-map nil
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"Table to lookup message-id from message index.")
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(defvar mh-thread-scan-line-map nil
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"Map of message index to various parts of the scan line.")
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(defvar mh-thread-old-scan-line-map nil
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"Old map of message index to various parts of the scan line.
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This is the original map that is stored when the folder is narrowed.")
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(defvar mh-thread-subject-container-hash nil
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"Hashtable used to group messages by subject.")
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(defvar mh-thread-duplicates nil
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"Hashtable used to remember multiple messages with the same message-id.")
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(defvar mh-thread-history ()
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"Variable to remember the transformations to the thread tree.
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When new messages are added, these transformations are rewound, then the
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links are added from the newly seen messages. Finally the transformations are
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redone to get the new thread tree. This makes incremental threading easier.")
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(defvar mh-thread-body-width nil
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"Width of scan substring that contains subject and body of message.")
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(make-variable-buffer-local 'mh-thread-id-hash)
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(make-variable-buffer-local 'mh-thread-subject-hash)
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(make-variable-buffer-local 'mh-thread-id-table)
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(make-variable-buffer-local 'mh-thread-id-index-map)
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(make-variable-buffer-local 'mh-thread-index-id-map)
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(make-variable-buffer-local 'mh-thread-scan-line-map)
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(make-variable-buffer-local 'mh-thread-old-scan-line-map)
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(make-variable-buffer-local 'mh-thread-subject-container-hash)
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(make-variable-buffer-local 'mh-thread-duplicates)
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(make-variable-buffer-local 'mh-thread-history)
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(defun mh-delete-seq (sequence)
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"Delete the SEQUENCE."
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(interactive (list (mh-read-seq-default "Delete" t)))
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(mh-map-to-seq-msgs 'mh-notate-if-in-one-seq sequence ? (1+ mh-cmd-note)
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sequence)
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(mh-undefine-sequence sequence '("all"))
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(mh-delete-seq-locally sequence))
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;; Avoid compiler warnings
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(defvar view-exit-action)
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(defun mh-list-sequences (folder)
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"List the sequences defined in FOLDER."
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(interactive (list (mh-prompt-for-folder "List sequences in"
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mh-current-folder t)))
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(let ((temp-buffer mh-temp-sequences-buffer)
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(seq-list mh-seq-list))
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(with-output-to-temp-buffer temp-buffer
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(save-excursion
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(set-buffer temp-buffer)
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(erase-buffer)
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(message "Listing sequences ...")
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(insert "Sequences in folder " folder ":\n")
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(while seq-list
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(let ((name (mh-seq-name (car seq-list)))
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(sorted-seq-msgs
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(sort (copy-sequence (mh-seq-msgs (car seq-list))) '<))
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(last-col (- (window-width) 4))
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name-spec)
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(insert (setq name-spec (format "%20s:" name)))
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(while sorted-seq-msgs
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(if (> (current-column) last-col)
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(progn
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(insert "\n")
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(move-to-column (length name-spec))))
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(insert (format " %s" (car sorted-seq-msgs)))
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(setq sorted-seq-msgs (cdr sorted-seq-msgs)))
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(insert "\n"))
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(setq seq-list (cdr seq-list)))
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(goto-char (point-min))
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(view-mode 1)
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(setq view-exit-action 'kill-buffer)
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(message "Listing sequences...done")))))
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(defun mh-msg-is-in-seq (message)
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"Display the sequences that contain MESSAGE (default: current message)."
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(interactive (list (mh-get-msg-num t)))
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(let* ((dest-folder (loop for seq in mh-refile-list
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when (member message (cdr seq))
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return (car seq)))
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(deleted-flag (unless dest-folder (member message mh-delete-list))))
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(message "Message %d%s is in sequences: %s"
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message
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(cond (dest-folder (format " (to be refiled to %s)" dest-folder))
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(deleted-flag (format " (to be deleted)"))
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(t ""))
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(mapconcat 'concat
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(mh-list-to-string (mh-seq-containing-msg message t))
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" "))))
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(defun mh-narrow-to-seq (sequence)
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"Restrict display of this folder to just messages in SEQUENCE.
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Use \\<mh-folder-mode-map>\\[mh-widen] to undo this command."
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(interactive (list (mh-read-seq "Narrow to" t)))
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(with-mh-folder-updating (t)
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(cond ((mh-seq-to-msgs sequence)
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(mh-widen)
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(mh-remove-all-notation)
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(let ((eob (point-max))
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(msg-at-cursor (mh-get-msg-num nil)))
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(setq mh-thread-old-scan-line-map mh-thread-scan-line-map)
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(setq mh-thread-scan-line-map (make-hash-table :test #'eql))
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(mh-copy-seq-to-eob sequence)
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(narrow-to-region eob (point-max))
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(mh-notate-user-sequences)
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(mh-notate-deleted-and-refiled)
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(mh-notate-seq 'cur mh-note-cur mh-cmd-note)
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(when msg-at-cursor (mh-goto-msg msg-at-cursor t t))
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(make-variable-buffer-local 'mh-non-seq-mode-line-annotation)
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(setq mh-non-seq-mode-line-annotation mh-mode-line-annotation)
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(setq mh-mode-line-annotation (symbol-name sequence))
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(mh-make-folder-mode-line)
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(mh-recenter nil)
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(if (and (boundp 'tool-bar-mode) tool-bar-mode)
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(set (make-local-variable 'tool-bar-map)
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mh-folder-seq-tool-bar-map))
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(setq mh-narrowed-to-seq sequence)
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(push 'widen mh-view-ops)))
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(t
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(error "No messages in sequence `%s'" (symbol-name sequence))))))
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(defun mh-put-msg-in-seq (msg-or-seq sequence)
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"Add MSG-OR-SEQ (default: displayed message) to SEQUENCE.
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If optional prefix argument provided, then prompt for the message sequence.
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If variable `transient-mark-mode' is non-nil and the mark is active, then
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the selected region is added to the sequence."
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(interactive (list (cond
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((mh-mark-active-p t)
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(mh-region-to-sequence (region-beginning) (region-end))
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'region)
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(current-prefix-arg
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(mh-read-seq-default "Add messages from" t))
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(t
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(mh-get-msg-num t)))
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(mh-read-seq-default "Add to" nil)))
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(if (not (mh-internal-seq sequence))
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(setq mh-last-seq-used sequence))
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(mh-add-msgs-to-seq (if (numberp msg-or-seq)
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msg-or-seq
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(mh-seq-to-msgs msg-or-seq))
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sequence))
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(defun mh-valid-view-change-operation-p (op)
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"Check if the view change operation can be performed.
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OP is one of 'widen and 'unthread."
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(cond ((eq (car mh-view-ops) op)
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(pop mh-view-ops))
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(t nil)))
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(defun mh-widen ()
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"Remove restrictions from current folder, thereby showing all messages."
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(interactive)
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(let ((msg (mh-get-msg-num nil)))
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(when mh-narrowed-to-seq
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(cond ((mh-valid-view-change-operation-p 'widen) nil)
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((memq 'widen mh-view-ops)
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(while (not (eq (car mh-view-ops) 'widen))
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(setq mh-view-ops (cdr mh-view-ops)))
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(pop mh-view-ops))
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(t (error "Widening is not applicable")))
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(when (memq 'unthread mh-view-ops)
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(setq mh-thread-scan-line-map mh-thread-old-scan-line-map))
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(with-mh-folder-updating (t)
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(delete-region (point-min) (point-max))
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(widen)
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(setq mh-mode-line-annotation mh-non-seq-mode-line-annotation)
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(mh-make-folder-mode-line))
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(if msg
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(mh-goto-msg msg t t))
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(mh-notate-deleted-and-refiled)
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(mh-notate-user-sequences)
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(mh-notate-seq 'cur mh-note-cur mh-cmd-note)
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(mh-recenter nil)))
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(if (and (boundp 'tool-bar-mode) tool-bar-mode)
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(set (make-local-variable 'tool-bar-map) mh-folder-tool-bar-map))
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(setq mh-narrowed-to-seq nil))
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;; FIXME? We may want to clear all notations and add one for current-message
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;; and process user sequences.
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(defun mh-notate-deleted-and-refiled ()
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"Notate messages marked for deletion or refiling.
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Messages to be deleted are given by `mh-delete-list' while messages to be
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refiled are present in `mh-refile-list'."
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(mh-mapc #'(lambda (msg) (mh-notate msg mh-note-deleted mh-cmd-note))
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mh-delete-list)
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(mh-mapc #'(lambda (dest-msg-list)
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;; foreach folder name, get the keyed sequence from mh-seq-list
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(let ((msg-list (cdr dest-msg-list)))
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(mh-mapc #'(lambda (msg)
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(mh-notate msg mh-note-refiled mh-cmd-note))
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msg-list)))
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mh-refile-list))
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;;; Commands to manipulate sequences. Sequences are stored in an alist
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;;; of the form:
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;;; ((seq-name msgs ...) (seq-name msgs ...) ...)
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(defun mh-read-seq-default (prompt not-empty)
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"Read and return sequence name with default narrowed or previous sequence.
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PROMPT is the prompt to use when reading. If NOT-EMPTY is non-nil then a
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non-empty sequence is read."
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(mh-read-seq prompt not-empty
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(or mh-narrowed-to-seq
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mh-last-seq-used
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(car (mh-seq-containing-msg (mh-get-msg-num nil) nil)))))
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(defun mh-read-seq (prompt not-empty &optional default)
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"Read and return a sequence name.
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Prompt with PROMPT, raise an error if the sequence is empty and the NOT-EMPTY
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flag is non-nil, and supply an optional DEFAULT sequence. A reply of '%'
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defaults to the first sequence containing the current message."
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(let* ((input (completing-read (format "%s %s %s" prompt "sequence:"
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(if default
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(format "[%s] " default)
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""))
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(mh-seq-names mh-seq-list)))
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(seq (cond ((equal input "%")
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(car (mh-seq-containing-msg (mh-get-msg-num t) nil)))
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((equal input "") default)
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(t (intern input))))
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(msgs (mh-seq-to-msgs seq)))
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(if (and (null msgs) not-empty)
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(error "No messages in sequence `%s'" seq))
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seq))
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(defun mh-seq-names (seq-list)
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"Return an alist containing the names of the SEQ-LIST."
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(mapcar (lambda (entry) (list (symbol-name (mh-seq-name entry))))
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seq-list))
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(defun mh-rename-seq (sequence new-name)
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"Rename SEQUENCE to have NEW-NAME."
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(interactive (list (mh-read-seq "Old" t)
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(intern (read-string "New sequence name: "))))
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(let ((old-seq (mh-find-seq sequence)))
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(or old-seq
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(error "Sequence %s does not exist" sequence))
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;; create new sequence first, since it might raise an error.
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(mh-define-sequence new-name (mh-seq-msgs old-seq))
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(mh-undefine-sequence sequence (mh-seq-msgs old-seq))
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(rplaca old-seq new-name)))
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(defun mh-map-to-seq-msgs (func seq &rest args)
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"Invoke the FUNC at each message in the SEQ.
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The remaining ARGS are passed as arguments to FUNC."
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(save-excursion
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(let ((msgs (mh-seq-to-msgs seq)))
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(while msgs
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(if (mh-goto-msg (car msgs) t t)
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(apply func (car msgs) args))
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(setq msgs (cdr msgs))))))
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(defun mh-notate-seq (seq notation offset)
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"Mark the scan listing.
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All messages in SEQ are marked with NOTATION at OFFSET from the beginning of
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the line."
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(mh-map-to-seq-msgs 'mh-notate seq notation offset))
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(defun mh-add-to-sequence (seq msgs)
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"The sequence SEQ is augmented with the messages in MSGS."
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;; Add to a SEQUENCE each message the list of MSGS.
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(if (not (mh-folder-name-p seq))
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(if msgs
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(apply 'mh-exec-cmd "mark" mh-current-folder "-add"
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"-sequence" (symbol-name seq)
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(mh-coalesce-msg-list msgs)))))
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;; This has a tricky bug. mh-map-to-seq-msgs uses mh-goto-msg, which assumes
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;; that the folder buffer is sorted. However in this case that assumption
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;; doesn't hold. So we will do this the dumb way.
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;(defun mh-copy-seq-to-point (seq location)
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; ;; Copy the scan listing of the messages in SEQUENCE to after the point
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; ;; LOCATION in the current buffer.
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; (mh-map-to-seq-msgs 'mh-copy-line-to-point seq location))
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(defun mh-copy-seq-to-eob (seq)
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"Copy SEQ to the end of the buffer."
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;; It is quite involved to write something which will work at any place in
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;; the buffer, so we will write something which works only at the end of
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;; the buffer. If we ever need to insert sequences in the middle of the
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;; buffer, this will need to be fixed.
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(save-excursion
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(let* ((msgs (mh-seq-to-msgs seq))
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(coalesced-msgs (mh-coalesce-msg-list msgs)))
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(goto-char (point-max))
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(save-restriction
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(narrow-to-region (point) (point))
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(mh-regenerate-headers coalesced-msgs t)
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(when (memq 'unthread mh-view-ops)
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;; Populate restricted scan-line map
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(goto-char (point-min))
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(while (not (eobp))
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(setf (gethash (mh-get-msg-num nil) mh-thread-scan-line-map)
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(mh-thread-parse-scan-line))
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(forward-line))
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;; Remove scan lines and read results from pre-computed thread tree
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(delete-region (point-min) (point-max))
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(let ((thread-tree (mh-thread-generate mh-current-folder ()))
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(mh-thread-body-width
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(- (window-width) mh-cmd-note
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(1- mh-scan-field-subject-start-offset))))
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(mh-thread-generate-scan-lines thread-tree -2)))))))
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(defun mh-copy-line-to-point (msg location)
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"Copy current message line to a specific location.
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||
The argument MSG is not used. The message in the current line is copied to
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LOCATION."
|
||
;; msg is not used?
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||
;; Copy the current line to the LOCATION in the current buffer.
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||
(beginning-of-line)
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(save-excursion
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(let ((beginning-of-line (point))
|
||
end)
|
||
(forward-line 1)
|
||
(setq end (point))
|
||
(goto-char location)
|
||
(insert-buffer-substring (current-buffer) beginning-of-line end))))
|
||
|
||
(defun mh-region-to-sequence (begin end)
|
||
"Define sequence 'region as the messages between point and mark.
|
||
When called programmatically, use arguments BEGIN and END to define region."
|
||
(interactive "r")
|
||
(mh-delete-seq-locally 'region)
|
||
(save-excursion
|
||
;; If end is end of buffer back up one position
|
||
(setq end (if (equal end (point-max)) (1- end) end))
|
||
(goto-char begin)
|
||
(while (<= (point) end)
|
||
(mh-add-msgs-to-seq (mh-get-msg-num t) 'region t)
|
||
(forward-line 1))))
|
||
|
||
|
||
|
||
;;; Commands to handle new 'subject sequence.
|
||
;;; Or "Poor man's threading" by psg.
|
||
|
||
(defun mh-subject-to-sequence (all)
|
||
"Put all following messages with same subject in sequence 'subject.
|
||
If arg ALL is t, move to beginning of folder buffer to collect all messages.
|
||
If arg ALL is nil, collect only messages fron current one on forward.
|
||
|
||
Return number of messages put in the sequence:
|
||
|
||
nil -> there was no subject line.
|
||
0 -> there were no later messages with the same subject (sequence not made)
|
||
>1 -> the total number of messages including current one."
|
||
(if (not (eq major-mode 'mh-folder-mode))
|
||
(error "Not in a folder buffer"))
|
||
(save-excursion
|
||
(beginning-of-line)
|
||
(if (or (not (looking-at mh-scan-subject-regexp))
|
||
(not (match-string 3))
|
||
(string-equal "" (match-string 3)))
|
||
(progn (message "No subject line.")
|
||
nil)
|
||
(let ((subject (match-string-no-properties 3))
|
||
(list))
|
||
(if (> (length subject) 41)
|
||
(setq subject (substring subject 0 41)))
|
||
(save-excursion
|
||
(if all
|
||
(goto-char (point-min)))
|
||
(while (re-search-forward mh-scan-subject-regexp nil t)
|
||
(let ((this-subject (match-string-no-properties 3)))
|
||
(if (> (length this-subject) 41)
|
||
(setq this-subject (substring this-subject 0 41)))
|
||
(if (string-equal this-subject subject)
|
||
(setq list (cons (mh-get-msg-num t) list))))))
|
||
(cond
|
||
(list
|
||
;; If we created a new sequence, add the initial message to it too.
|
||
(if (not (member (mh-get-msg-num t) list))
|
||
(setq list (cons (mh-get-msg-num t) list)))
|
||
(if (member '("subject") (mh-seq-names mh-seq-list))
|
||
(mh-delete-seq 'subject))
|
||
;; sort the result into a sequence
|
||
(let ((sorted-list (sort (copy-sequence list) 'mh-lessp)))
|
||
(while sorted-list
|
||
(mh-add-msgs-to-seq (car sorted-list) 'subject nil)
|
||
(setq sorted-list (cdr sorted-list)))
|
||
(safe-length list)))
|
||
(t
|
||
0))))))
|
||
|
||
(defun mh-narrow-to-subject ()
|
||
"Narrow to a sequence containing all following messages with same subject."
|
||
(interactive)
|
||
(let ((num (mh-get-msg-num nil))
|
||
(count (mh-subject-to-sequence t)))
|
||
(cond
|
||
((not count) ; No subject line, delete msg anyway
|
||
nil)
|
||
((= 0 count) ; No other msgs, delete msg anyway.
|
||
(message "No other messages with same Subject following this one.")
|
||
nil)
|
||
(t ; We have a subject sequence.
|
||
(message "Found %d messages for subject sequence." count)
|
||
(mh-narrow-to-seq 'subject)
|
||
(if (numberp num)
|
||
(mh-goto-msg num t t))))))
|
||
|
||
(defun mh-delete-subject ()
|
||
"Mark all following messages with same subject to be deleted.
|
||
This puts the messages in a sequence named subject. You can undo the last
|
||
deletion marks using `mh-undo' with a prefix argument and then specifying the
|
||
subject sequence."
|
||
(interactive)
|
||
(let ((count (mh-subject-to-sequence nil)))
|
||
(cond
|
||
((not count) ; No subject line, delete msg anyway
|
||
(mh-delete-msg (mh-get-msg-num t)))
|
||
((= 0 count) ; No other msgs, delete msg anyway.
|
||
(message "No other messages with same Subject following this one.")
|
||
(mh-delete-msg (mh-get-msg-num t)))
|
||
(t ; We have a subject sequence.
|
||
(message "Marked %d messages for deletion" count)
|
||
(mh-delete-msg 'subject)))))
|
||
|
||
;;; Message threading:
|
||
|
||
(defun mh-thread-initialize ()
|
||
"Make hash tables, otherwise clear them."
|
||
(cond
|
||
(mh-thread-id-hash
|
||
(clrhash mh-thread-id-hash)
|
||
(clrhash mh-thread-subject-hash)
|
||
(clrhash mh-thread-id-table)
|
||
(clrhash mh-thread-id-index-map)
|
||
(clrhash mh-thread-index-id-map)
|
||
(clrhash mh-thread-scan-line-map)
|
||
(clrhash mh-thread-subject-container-hash)
|
||
(clrhash mh-thread-duplicates)
|
||
(setq mh-thread-history ()))
|
||
(t (setq mh-thread-id-hash (make-hash-table :test #'equal))
|
||
(setq mh-thread-subject-hash (make-hash-table :test #'equal))
|
||
(setq mh-thread-id-table (make-hash-table :test #'eq))
|
||
(setq mh-thread-id-index-map (make-hash-table :test #'eq))
|
||
(setq mh-thread-index-id-map (make-hash-table :test #'eql))
|
||
(setq mh-thread-scan-line-map (make-hash-table :test #'eql))
|
||
(setq mh-thread-subject-container-hash (make-hash-table :test #'eq))
|
||
(setq mh-thread-duplicates (make-hash-table :test #'eq))
|
||
(setq mh-thread-history ()))))
|
||
|
||
(defsubst mh-thread-id-container (id)
|
||
"Given ID, return the corresponding container in `mh-thread-id-table'.
|
||
If no container exists then a suitable container is created and the id-table
|
||
is updated."
|
||
(when (not id)
|
||
(error "1"))
|
||
(or (gethash id mh-thread-id-table)
|
||
(setf (gethash id mh-thread-id-table)
|
||
(let ((message (mh-thread-make-message :id id)))
|
||
(mh-thread-make-container :message message)))))
|
||
|
||
(defsubst mh-thread-remove-parent-link (child)
|
||
"Remove parent link of CHILD if it exists."
|
||
(let* ((child-container (if (mh-thread-container-p child)
|
||
child (mh-thread-id-container child)))
|
||
(parent-container (mh-container-parent child-container)))
|
||
(when parent-container
|
||
(setf (mh-container-children parent-container)
|
||
(remove* child-container (mh-container-children parent-container)
|
||
:test #'eq))
|
||
(setf (mh-container-parent child-container) nil))))
|
||
|
||
(defsubst mh-thread-add-link (parent child &optional at-end-p)
|
||
"Add links so that PARENT becomes a parent of CHILD.
|
||
Doesn't make any changes if CHILD is already an ancestor of PARENT. If
|
||
optional argument AT-END-P is non-nil, the CHILD is added to the end of the
|
||
children list of PARENT."
|
||
(let ((parent-container (cond ((null parent) nil)
|
||
((mh-thread-container-p parent) parent)
|
||
(t (mh-thread-id-container parent))))
|
||
(child-container (if (mh-thread-container-p child)
|
||
child (mh-thread-id-container child))))
|
||
(when (and parent-container
|
||
(not (mh-thread-ancestor-p child-container parent-container))
|
||
(not (mh-thread-ancestor-p parent-container child-container)))
|
||
(mh-thread-remove-parent-link child-container)
|
||
(cond ((not at-end-p)
|
||
(push child-container (mh-container-children parent-container)))
|
||
((null (mh-container-children parent-container))
|
||
(push child-container (mh-container-children parent-container)))
|
||
(t (let ((last-child (mh-container-children parent-container)))
|
||
(while (cdr last-child)
|
||
(setq last-child (cdr last-child)))
|
||
(setcdr last-child (cons child-container nil)))))
|
||
(setf (mh-container-parent child-container) parent-container))
|
||
(unless parent-container
|
||
(mh-thread-remove-parent-link child-container))))
|
||
|
||
(defun mh-thread-ancestor-p (ancestor successor)
|
||
"Return t if ANCESTOR is really an ancestor of SUCCESSOR and nil otherwise.
|
||
In the limit, the function returns t if ANCESTOR and SUCCESSOR are the same
|
||
containers."
|
||
(block nil
|
||
(while successor
|
||
(when (eq ancestor successor) (return t))
|
||
(setq successor (mh-container-parent successor)))
|
||
nil))
|
||
|
||
(defsubst mh-thread-get-message-container (message)
|
||
"Return container which has MESSAGE in it.
|
||
If there is no container present then a new container is allocated."
|
||
(let* ((id (mh-message-id message))
|
||
(container (gethash id mh-thread-id-table)))
|
||
(cond (container (setf (mh-container-message container) message)
|
||
container)
|
||
(t (setf (gethash id mh-thread-id-table)
|
||
(mh-thread-make-container :message message))))))
|
||
|
||
(defsubst mh-thread-get-message (id subject-re-p subject refs)
|
||
"Return appropriate message.
|
||
Otherwise update message already present to have the proper ID, SUBJECT-RE-P,
|
||
SUBJECT and REFS fields."
|
||
(let* ((container (gethash id mh-thread-id-table))
|
||
(message (if container (mh-container-message container) nil)))
|
||
(cond (message
|
||
(setf (mh-message-subject-re-p message) subject-re-p)
|
||
(setf (mh-message-subject message) subject)
|
||
(setf (mh-message-id message) id)
|
||
(setf (mh-message-references message) refs)
|
||
message)
|
||
(container
|
||
(setf (mh-container-message container)
|
||
(mh-thread-make-message :subject subject
|
||
:subject-re-p subject-re-p
|
||
:id id :references refs)))
|
||
(t (let ((message (mh-thread-make-message
|
||
:subject subject
|
||
:subject-re-p subject-re-p
|
||
:id id :references refs)))
|
||
(prog1 message
|
||
(mh-thread-get-message-container message)))))))
|
||
|
||
(defsubst mh-thread-canonicalize-id (id)
|
||
"Produce canonical string representation for ID.
|
||
This allows cheap string comparison with EQ."
|
||
(or (and (equal id "") (copy-sequence ""))
|
||
(gethash id mh-thread-id-hash)
|
||
(setf (gethash id mh-thread-id-hash) id)))
|
||
|
||
(defsubst mh-thread-prune-subject (subject)
|
||
"Prune leading Re:'s, Fwd:'s etc. and trailing (fwd)'s from SUBJECT.
|
||
If the result after pruning is not the empty string then it is canonicalized
|
||
so that subjects can be tested for equality with eq. This is done so that all
|
||
the messages without a subject are not put into a single thread."
|
||
(let ((case-fold-search t)
|
||
(subject-pruned-flag nil))
|
||
;; Prune subject leader
|
||
(while (or (string-match "^[ \t]*\\(re\\|fwd?\\)\\(\\[[0-9]*\\]\\)?:[ \t]*"
|
||
subject)
|
||
(string-match "^[ \t]*\\[[^\\]][ \t]*" subject))
|
||
(setq subject-pruned-flag t)
|
||
(setq subject (substring subject (match-end 0))))
|
||
;; Prune subject trailer
|
||
(while (or (string-match "(fwd)$" subject)
|
||
(string-match "[ \t]+$" subject))
|
||
(setq subject-pruned-flag t)
|
||
(setq subject (substring subject 0 (match-beginning 0))))
|
||
;; Canonicalize subject only if it is non-empty
|
||
(cond ((equal subject "") (values subject subject-pruned-flag))
|
||
(t (values
|
||
(or (gethash subject mh-thread-subject-hash)
|
||
(setf (gethash subject mh-thread-subject-hash) subject))
|
||
subject-pruned-flag)))))
|
||
|
||
(defun mh-thread-container-subject (container)
|
||
"Return the subject of CONTAINER.
|
||
If CONTAINER is empty return the subject info of one of its children."
|
||
(cond ((and (mh-container-message container)
|
||
(mh-message-id (mh-container-message container)))
|
||
(mh-message-subject (mh-container-message container)))
|
||
(t (block nil
|
||
(dolist (kid (mh-container-children container))
|
||
(when (and (mh-container-message kid)
|
||
(mh-message-id (mh-container-message kid)))
|
||
(let ((kid-message (mh-container-message kid)))
|
||
(return (mh-message-subject kid-message)))))
|
||
(error "This can't happen!")))))
|
||
|
||
(defun mh-thread-rewind-pruning ()
|
||
"Restore the thread tree to its state before pruning."
|
||
(while mh-thread-history
|
||
(let ((action (pop mh-thread-history)))
|
||
(cond ((eq (car action) 'DROP)
|
||
(mh-thread-remove-parent-link (cadr action))
|
||
(mh-thread-add-link (caddr action) (cadr action)))
|
||
((eq (car action) 'PROMOTE)
|
||
(let ((node (cadr action))
|
||
(parent (caddr action))
|
||
(children (cdddr action)))
|
||
(dolist (child children)
|
||
(mh-thread-remove-parent-link child)
|
||
(mh-thread-add-link node child))
|
||
(mh-thread-add-link parent node)))
|
||
((eq (car action) 'SUBJECT)
|
||
(let ((node (cadr action)))
|
||
(mh-thread-remove-parent-link node)
|
||
(setf (mh-container-real-child-p node) t)))))))
|
||
|
||
(defun mh-thread-prune-containers (roots)
|
||
"Prune empty containers in the containers ROOTS."
|
||
(let ((dfs-ordered-nodes ())
|
||
(work-list roots))
|
||
(while work-list
|
||
(let ((node (pop work-list)))
|
||
(dolist (child (mh-container-children node))
|
||
(push child work-list))
|
||
(push node dfs-ordered-nodes)))
|
||
(while dfs-ordered-nodes
|
||
(let ((node (pop dfs-ordered-nodes)))
|
||
(cond ((gethash (mh-message-id (mh-container-message node))
|
||
mh-thread-id-index-map)
|
||
;; Keep it
|
||
(setf (mh-container-children node)
|
||
(mh-thread-sort-containers (mh-container-children node))))
|
||
((and (mh-container-children node)
|
||
(or (null (cdr (mh-container-children node)))
|
||
(mh-container-parent node)))
|
||
;; Promote kids
|
||
(let ((children ()))
|
||
(dolist (kid (mh-container-children node))
|
||
(mh-thread-remove-parent-link kid)
|
||
(mh-thread-add-link (mh-container-parent node) kid)
|
||
(push kid children))
|
||
(push `(PROMOTE ,node ,(mh-container-parent node) ,@children)
|
||
mh-thread-history)
|
||
(mh-thread-remove-parent-link node)))
|
||
((mh-container-children node)
|
||
;; Promote the first orphan to parent and add the other kids as
|
||
;; his children
|
||
(setf (mh-container-children node)
|
||
(mh-thread-sort-containers (mh-container-children node)))
|
||
(let ((new-parent (car (mh-container-children node)))
|
||
(other-kids (cdr (mh-container-children node))))
|
||
(mh-thread-remove-parent-link new-parent)
|
||
(dolist (kid other-kids)
|
||
(mh-thread-remove-parent-link kid)
|
||
(setf (mh-container-real-child-p kid) nil)
|
||
(mh-thread-add-link new-parent kid t))
|
||
(push `(PROMOTE ,node ,(mh-container-parent node)
|
||
,new-parent ,@other-kids)
|
||
mh-thread-history)
|
||
(mh-thread-remove-parent-link node)))
|
||
(t
|
||
;; Drop it
|
||
(push `(DROP ,node ,(mh-container-parent node))
|
||
mh-thread-history)
|
||
(mh-thread-remove-parent-link node)))))
|
||
(let ((results ()))
|
||
(maphash #'(lambda (k v)
|
||
(declare (ignore k))
|
||
(when (and (null (mh-container-parent v))
|
||
(gethash (mh-message-id (mh-container-message v))
|
||
mh-thread-id-index-map))
|
||
(push v results)))
|
||
mh-thread-id-table)
|
||
(mh-thread-sort-containers results))))
|
||
|
||
(defun mh-thread-sort-containers (containers)
|
||
"Sort a list of message CONTAINERS to be in ascending order wrt index."
|
||
(sort containers
|
||
#'(lambda (x y)
|
||
(when (and (mh-container-message x) (mh-container-message y))
|
||
(let* ((id-x (mh-message-id (mh-container-message x)))
|
||
(id-y (mh-message-id (mh-container-message y)))
|
||
(index-x (gethash id-x mh-thread-id-index-map))
|
||
(index-y (gethash id-y mh-thread-id-index-map)))
|
||
(and (integerp index-x) (integerp index-y)
|
||
(< index-x index-y)))))))
|
||
|
||
(defsubst mh-thread-group-by-subject (roots)
|
||
"Group the set of message containers, ROOTS based on subject.
|
||
Bug: Check for and make sure that something without Re: is made the parent in
|
||
preference to something that has it."
|
||
(clrhash mh-thread-subject-container-hash)
|
||
(let ((results ()))
|
||
(dolist (root roots)
|
||
(let* ((subject (mh-thread-container-subject root))
|
||
(parent (gethash subject mh-thread-subject-container-hash)))
|
||
(cond (parent (mh-thread-remove-parent-link root)
|
||
(mh-thread-add-link parent root t)
|
||
(setf (mh-container-real-child-p root) nil)
|
||
(push `(SUBJECT ,root) mh-thread-history))
|
||
(t
|
||
(setf (gethash subject mh-thread-subject-container-hash) root)
|
||
(push root results)))))
|
||
(nreverse results)))
|
||
|
||
(defsubst mh-thread-process-in-reply-to (reply-to-header)
|
||
"Extract message id's from REPLY-TO-HEADER.
|
||
Ideally this should have some regexp which will try to guess if a string
|
||
between < and > is a message id and not an email address. For now it will
|
||
take the last string inside angles."
|
||
(let ((end (search ">" reply-to-header :from-end t)))
|
||
(when (numberp end)
|
||
(let ((begin (search "<" reply-to-header :from-end t :end2 end)))
|
||
(when (numberp begin)
|
||
(list (substring reply-to-header begin (1+ end))))))))
|
||
|
||
(defun mh-thread-set-tables (folder)
|
||
"Use the tables of FOLDER in current buffer."
|
||
(flet ((mh-get-table (symbol)
|
||
(save-excursion (set-buffer folder) (symbol-value symbol))))
|
||
(setq mh-thread-id-hash (mh-get-table 'mh-thread-id-hash))
|
||
(setq mh-thread-subject-hash (mh-get-table 'mh-thread-subject-hash))
|
||
(setq mh-thread-id-table (mh-get-table 'mh-thread-id-table))
|
||
(setq mh-thread-id-index-map (mh-get-table 'mh-thread-id-index-map))
|
||
(setq mh-thread-index-id-map (mh-get-table 'mh-thread-index-id-map))
|
||
(setq mh-thread-scan-line-map (mh-get-table 'mh-thread-scan-line-map))
|
||
(setq mh-thread-subject-container-hash
|
||
(mh-get-table 'mh-thread-subject-container-hash))
|
||
(setq mh-thread-duplicates (mh-get-table 'mh-thread-duplicates))
|
||
(setq mh-thread-history (mh-get-table 'mh-thread-history))))
|
||
|
||
(defsubst mh-thread-update-id-index-maps (id index)
|
||
"Message with id, ID is the message in INDEX.
|
||
The function also checks for duplicate messages (that is multiple messages
|
||
with the same ID). These messages are put in the `mh-thread-duplicates' hash
|
||
table."
|
||
(let ((old-index (gethash id mh-thread-id-index-map)))
|
||
(when old-index (push old-index (gethash id mh-thread-duplicates)))
|
||
(setf (gethash id mh-thread-id-index-map) index)
|
||
(setf (gethash index mh-thread-index-id-map) id)))
|
||
|
||
|
||
|
||
;;; Generate Threads...
|
||
|
||
(defun mh-thread-generate (folder msg-list)
|
||
"Scan FOLDER to get info for threading.
|
||
Only information about messages in MSG-LIST are added to the tree."
|
||
(save-excursion
|
||
(set-buffer (get-buffer-create "*mh-thread*"))
|
||
(mh-thread-set-tables folder)
|
||
(erase-buffer)
|
||
(when msg-list
|
||
(apply
|
||
#'call-process (expand-file-name mh-scan-prog mh-progs) nil '(t nil) nil
|
||
"-width" "10000" "-format"
|
||
"%(msg)\n%{message-id}\n%{references}\n%{in-reply-to}\n%{subject}\n"
|
||
(mapcar #'(lambda (x) (format "%s" x)) msg-list)))
|
||
(goto-char (point-min))
|
||
(let ((roots ())
|
||
(case-fold-search t))
|
||
(block nil
|
||
(while (not (eobp))
|
||
(block process-message
|
||
(let* ((index-line
|
||
(prog1 (buffer-substring (point) (line-end-position))
|
||
(forward-line)))
|
||
(index (car (read-from-string index-line)))
|
||
(id (prog1 (buffer-substring (point) (line-end-position))
|
||
(forward-line)))
|
||
(refs (prog1 (buffer-substring (point) (line-end-position))
|
||
(forward-line)))
|
||
(in-reply-to (prog1 (buffer-substring (point)
|
||
(line-end-position))
|
||
(forward-line)))
|
||
(subject (prog1
|
||
(buffer-substring (point) (line-end-position))
|
||
(forward-line)))
|
||
(subject-re-p nil))
|
||
(unless (gethash index mh-thread-scan-line-map)
|
||
(return-from process-message))
|
||
(unless (integerp index) (return)) ;Error message here
|
||
(multiple-value-setq (subject subject-re-p)
|
||
(mh-thread-prune-subject subject))
|
||
(setq in-reply-to (mh-thread-process-in-reply-to in-reply-to))
|
||
(setq refs (append (split-string refs) in-reply-to))
|
||
(setq id (mh-thread-canonicalize-id id))
|
||
(mh-thread-update-id-index-maps id index)
|
||
(setq refs (mapcar #'mh-thread-canonicalize-id refs))
|
||
(mh-thread-get-message id subject-re-p subject refs)
|
||
(do ((ancestors refs (cdr ancestors)))
|
||
((null (cdr ancestors))
|
||
(when (car ancestors)
|
||
(mh-thread-remove-parent-link id)
|
||
(mh-thread-add-link (car ancestors) id)))
|
||
(mh-thread-add-link (car ancestors) (cadr ancestors)))))))
|
||
(maphash #'(lambda (k v)
|
||
(declare (ignore k))
|
||
(when (null (mh-container-parent v))
|
||
(push v roots)))
|
||
mh-thread-id-table)
|
||
(setq roots (mh-thread-prune-containers roots))
|
||
(prog1 (setq roots (mh-thread-group-by-subject roots))
|
||
(let ((history mh-thread-history))
|
||
(set-buffer folder)
|
||
(setq mh-thread-history history))))))
|
||
|
||
(defun mh-thread-inc (folder start-point)
|
||
"Update thread tree for FOLDER.
|
||
All messages after START-POINT are added to the thread tree."
|
||
(mh-thread-rewind-pruning)
|
||
(goto-char start-point)
|
||
(let ((msg-list ()))
|
||
(while (not (eobp))
|
||
(let ((index (mh-get-msg-num nil)))
|
||
(push index msg-list)
|
||
(setf (gethash index mh-thread-scan-line-map)
|
||
(mh-thread-parse-scan-line))
|
||
(forward-line)))
|
||
(let ((thread-tree (mh-thread-generate folder msg-list))
|
||
(buffer-read-only nil)
|
||
(old-buffer-modified-flag (buffer-modified-p)))
|
||
(delete-region (point-min) (point-max))
|
||
(let ((mh-thread-body-width (- (window-width) mh-cmd-note
|
||
(1- mh-scan-field-subject-start-offset))))
|
||
(mh-thread-generate-scan-lines thread-tree -2))
|
||
(mh-notate-user-sequences)
|
||
(mh-notate-deleted-and-refiled)
|
||
(mh-notate-seq 'cur mh-note-cur mh-cmd-note)
|
||
(set-buffer-modified-p old-buffer-modified-flag))))
|
||
|
||
(defun mh-thread-generate-scan-lines (tree level)
|
||
"Generate scan lines.
|
||
TREE is the hierarchical tree of messages, SCAN-LINE-MAP maps message indices
|
||
to the corresponding scan lines and LEVEL used to determine indentation of
|
||
the message."
|
||
(cond ((null tree) nil)
|
||
((mh-thread-container-p tree)
|
||
(let* ((message (mh-container-message tree))
|
||
(id (mh-message-id message))
|
||
(index (gethash id mh-thread-id-index-map))
|
||
(duplicates (gethash id mh-thread-duplicates))
|
||
(new-level (+ level 2))
|
||
(dupl-flag t)
|
||
(increment-level-flag nil))
|
||
(dolist (scan-line (mapcar (lambda (x)
|
||
(gethash x mh-thread-scan-line-map))
|
||
(reverse (cons index duplicates))))
|
||
(when scan-line
|
||
(insert (car scan-line)
|
||
(format (format "%%%ss"
|
||
(if dupl-flag level new-level)) "")
|
||
(if (and (mh-container-real-child-p tree) dupl-flag)
|
||
"[" "<")
|
||
(cadr scan-line)
|
||
(if (and (mh-container-real-child-p tree) dupl-flag)
|
||
"]" ">")
|
||
(truncate-string-to-width
|
||
(caddr scan-line) (- mh-thread-body-width
|
||
(if dupl-flag level new-level)))
|
||
"\n")
|
||
(setq increment-level-flag t)
|
||
(setq dupl-flag nil)))
|
||
(unless increment-level-flag (setq new-level level))
|
||
(dolist (child (mh-container-children tree))
|
||
(mh-thread-generate-scan-lines child new-level))))
|
||
(t (let ((nlevel (+ level 2)))
|
||
(dolist (ch tree)
|
||
(mh-thread-generate-scan-lines ch nlevel))))))
|
||
|
||
;; Another and may be better approach would be to generate all the info from
|
||
;; the scan which generates the threading info. For now this will have to do.
|
||
(defun mh-thread-parse-scan-line (&optional string)
|
||
"Parse a scan line.
|
||
If optional argument STRING is given then that is assumed to be the scan line.
|
||
Otherwise uses the line at point as the scan line to parse."
|
||
(let* ((string (or string
|
||
(buffer-substring-no-properties (line-beginning-position)
|
||
(line-end-position))))
|
||
(first-string (substring string 0 (+ mh-cmd-note 8))))
|
||
(setf (elt first-string mh-cmd-note) ? )
|
||
(when (equal (elt first-string (1+ mh-cmd-note)) (elt mh-note-seq 0))
|
||
(setf (elt first-string (1+ mh-cmd-note)) ? ))
|
||
(list first-string
|
||
(substring string
|
||
(+ mh-cmd-note mh-scan-field-from-start-offset)
|
||
(+ mh-cmd-note mh-scan-field-from-end-offset -2))
|
||
(substring string (+ mh-cmd-note mh-scan-field-from-end-offset))
|
||
string)))
|
||
|
||
(defun mh-thread-add-spaces (count)
|
||
"Add COUNT spaces to each scan line in `mh-thread-scan-line-map'."
|
||
(let ((spaces (format (format "%%%ss" count) "")))
|
||
(while (not (eobp))
|
||
(let* ((msg-num (mh-get-msg-num nil))
|
||
(old-line (nth 3 (gethash msg-num mh-thread-scan-line-map))))
|
||
(setf (gethash msg-num mh-thread-scan-line-map)
|
||
(mh-thread-parse-scan-line (format "%s%s" spaces old-line))))
|
||
(forward-line 1))))
|
||
|
||
(defun mh-thread-folder ()
|
||
"Generate thread view of folder."
|
||
(message "Threading %s..." (buffer-name))
|
||
(mh-thread-initialize)
|
||
(goto-char (point-min))
|
||
(while (not (eobp))
|
||
(setf (gethash (mh-get-msg-num nil) mh-thread-scan-line-map)
|
||
(mh-thread-parse-scan-line))
|
||
(forward-line))
|
||
(let* ((range (format "%s-%s" mh-first-msg-num mh-last-msg-num))
|
||
(thread-tree (mh-thread-generate (buffer-name) (list range)))
|
||
(buffer-read-only nil)
|
||
(old-buffer-modified-p (buffer-modified-p)))
|
||
(delete-region (point-min) (point-max))
|
||
(let ((mh-thread-body-width (- (window-width) mh-cmd-note
|
||
(1- mh-scan-field-subject-start-offset))))
|
||
(mh-thread-generate-scan-lines thread-tree -2))
|
||
(mh-notate-user-sequences)
|
||
(mh-notate-deleted-and-refiled)
|
||
(mh-notate-seq 'cur mh-note-cur mh-cmd-note)
|
||
(set-buffer-modified-p old-buffer-modified-p)
|
||
(message "Threading %s...done" (buffer-name))))
|
||
|
||
(defun mh-toggle-threads ()
|
||
"Toggle threaded view of folder.
|
||
The conversion of normal view to threaded view is exact, that is the same
|
||
messages are displayed in the folder buffer before and after threading. However
|
||
the conversion from threaded view to normal view is inexact. So more messages
|
||
than were originally present may be shown as a result."
|
||
(interactive)
|
||
(let ((msg-at-point (mh-get-msg-num nil)))
|
||
(cond ((and (memq 'unthread mh-view-ops) mh-narrowed-to-seq)
|
||
(unless (mh-valid-view-change-operation-p 'unthread)
|
||
(error "Can't unthread folder"))
|
||
(mh-scan-folder mh-current-folder
|
||
(format "%s" mh-narrowed-to-seq)
|
||
t))
|
||
((memq 'unthread mh-view-ops)
|
||
(unless (mh-valid-view-change-operation-p 'unthread)
|
||
(error "Can't unthread folder"))
|
||
(mh-scan-folder mh-current-folder
|
||
(format "%s-%s" mh-first-msg-num mh-last-msg-num)
|
||
t))
|
||
(t (mh-thread-folder)
|
||
(push 'unthread mh-view-ops)))
|
||
(when msg-at-point (mh-goto-msg msg-at-point t t))
|
||
(mh-recenter nil)))
|
||
|
||
(defun mh-thread-forget-message (index)
|
||
"Forget the message INDEX from the threading tables."
|
||
(let* ((id (gethash index mh-thread-index-id-map))
|
||
(id-index (gethash id mh-thread-id-index-map))
|
||
(duplicates (gethash id mh-thread-duplicates)))
|
||
(remhash index mh-thread-index-id-map)
|
||
(cond ((and (eql index id-index) (null duplicates))
|
||
(remhash id mh-thread-id-index-map))
|
||
((eql index id-index)
|
||
(setf (gethash id mh-thread-id-index-map) (car duplicates))
|
||
(setf (gethash (car duplicates) mh-thread-index-id-map) id)
|
||
(setf (gethash id mh-thread-duplicates) (cdr duplicates)))
|
||
(t
|
||
(setf (gethash id mh-thread-duplicates)
|
||
(remove index duplicates))))))
|
||
|
||
(provide 'mh-seq)
|
||
|
||
;;; Local Variables:
|
||
;;; sentence-end-double-space: nil
|
||
;;; End:
|
||
|
||
;;; mh-seq.el ends here
|