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;;; gnus-registry.el --- article registry for Gnus
;; Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004,
;; 2005, 2006 Free Software Foundation, Inc.
;; Author: Ted Zlatanov <tzz@lifelogs.com>
;; Keywords: news
;; This file is 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 2, 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; see the file COPYING. If not, write to the
;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
;; Boston, MA 02110-1301, USA.
;;; Commentary:
;; This is the gnus-registry.el package, works with other backends
;; besides nnmail. The major issue is that it doesn't go across
;; backends, so for instance if an article is in nnml:sys and you see
;; a reference to it in nnimap splitting, the article will end up in
;; nnimap:sys
;; gnus-registry.el intercepts article respooling, moving, deleting,
;; and copying for all backends. If it doesn't work correctly for
;; you, submit a bug report and I'll be glad to fix it. It needs
;; documentation in the manual (also on my to-do list).
;; Put this in your startup file (~/.gnus.el for instance)
;; (setq gnus-registry-max-entries 2500
;; gnus-registry-use-long-group-names t)
;; (gnus-registry-initialize)
;; Then use this in your fancy-split:
;; (: gnus-registry-split-fancy-with-parent)
;; TODO:
;; - get the correct group on spool actions
;; - articles that are spooled to a different backend should be handled
;;; Code:
(eval-when-compile (require 'cl))
(require 'gnus)
(require 'gnus-int)
(require 'gnus-sum)
(require 'nnmail)
(defvar gnus-registry-dirty t
"Boolean set to t when the registry is modified")
(defgroup gnus-registry nil
"The Gnus registry."
:version "22.1"
:group 'gnus)
(defvar gnus-registry-hashtb nil
"*The article registry by Message ID.")
(defcustom gnus-registry-unfollowed-groups '("delayed" "drafts" "queue")
"List of groups that gnus-registry-split-fancy-with-parent won't follow.
The group names are matched, they don't have to be fully qualified."
:group 'gnus-registry
:type '(repeat string))
(defcustom gnus-registry-install nil
"Whether the registry should be installed."
:group 'gnus-registry
:type 'boolean)
(defcustom gnus-registry-clean-empty t
"Whether the empty registry entries should be deleted.
Registry entries are considered empty when they have no groups."
:group 'gnus-registry
:type 'boolean)
(defcustom gnus-registry-use-long-group-names nil
"Whether the registry should use long group names (BUGGY)."
:group 'gnus-registry
:type 'boolean)
(defcustom gnus-registry-track-extra nil
"Whether the registry should track extra data about a message.
The Subject and Sender (From:) headers are currently tracked this
way."
:group 'gnus-registry
:type
'(set :tag "Tracking choices"
(const :tag "Track by subject (Subject: header)" subject)
(const :tag "Track by sender (From: header)" sender)))
(defcustom gnus-registry-entry-caching t
"Whether the registry should cache extra information."
:group 'gnus-registry
:type 'boolean)
(defcustom gnus-registry-minimum-subject-length 5
"The minimum length of a subject before it's considered trackable."
:group 'gnus-registry
:type 'integer)
(defcustom gnus-registry-trim-articles-without-groups t
"Whether the registry should clean out message IDs without groups."
:group 'gnus-registry
:type 'boolean)
(defcustom gnus-registry-cache-file "~/.gnus.registry.eld"
"File where the Gnus registry will be stored."
:group 'gnus-registry
:type 'file)
(defcustom gnus-registry-max-entries nil
"Maximum number of entries in the registry, nil for unlimited."
:group 'gnus-registry
:type '(radio (const :format "Unlimited " nil)
(integer :format "Maximum number: %v")))
;; Function(s) missing in Emacs 20
(when (memq nil (mapcar 'fboundp '(puthash)))
(require 'cl)
(unless (fboundp 'puthash)
;; alias puthash is missing from Emacs 20 cl-extra.el
(defalias 'puthash 'cl-puthash)))
(defun gnus-registry-track-subject-p ()
(memq 'subject gnus-registry-track-extra))
(defun gnus-registry-track-sender-p ()
(memq 'sender gnus-registry-track-extra))
(defun gnus-registry-cache-read ()
"Read the registry cache file."
(interactive)
(let ((file gnus-registry-cache-file))
(when (file-exists-p file)
(gnus-message 5 "Reading %s..." file)
(gnus-load file)
(gnus-message 5 "Reading %s...done" file))))
(defun gnus-registry-cache-save ()
"Save the registry cache file."
(interactive)
(let ((file gnus-registry-cache-file))
(save-excursion
(set-buffer (gnus-get-buffer-create " *Gnus-registry-cache*"))
(make-local-variable 'version-control)
(setq version-control gnus-backup-startup-file)
(setq buffer-file-name file)
(setq default-directory (file-name-directory buffer-file-name))
(buffer-disable-undo)
(erase-buffer)
(gnus-message 5 "Saving %s..." file)
(if gnus-save-startup-file-via-temp-buffer
(let ((coding-system-for-write gnus-ding-file-coding-system)
(standard-output (current-buffer)))
(gnus-gnus-to-quick-newsrc-format t "gnus registry startup file" 'gnus-registry-alist)
(gnus-registry-cache-whitespace file)
(save-buffer))
(let ((coding-system-for-write gnus-ding-file-coding-system)
(version-control gnus-backup-startup-file)
(startup-file file)
(working-dir (file-name-directory file))
working-file
(i -1))
;; Generate the name of a non-existent file.
(while (progn (setq working-file
(format
(if (and (eq system-type 'ms-dos)
(not (gnus-long-file-names)))
"%s#%d.tm#" ; MSDOS limits files to 8+3
(if (memq system-type '(vax-vms axp-vms))
"%s$tmp$%d"
"%s#tmp#%d"))
working-dir (setq i (1+ i))))
(file-exists-p working-file)))
(unwind-protect
(progn
(gnus-with-output-to-file working-file
(gnus-gnus-to-quick-newsrc-format t "gnus registry startup file" 'gnus-registry-alist))
;; These bindings will mislead the current buffer
;; into thinking that it is visiting the startup
;; file.
(let ((buffer-backed-up nil)
(buffer-file-name startup-file)
(file-precious-flag t)
(setmodes (file-modes startup-file)))
;; Backup the current version of the startup file.
(backup-buffer)
;; Replace the existing startup file with the temp file.
(rename-file working-file startup-file t)
(set-file-modes startup-file setmodes)))
(condition-case nil
(delete-file working-file)
(file-error nil)))))
(gnus-kill-buffer (current-buffer))
(gnus-message 5 "Saving %s...done" file))))
;; Idea from Dan Christensen <jdc@chow.mat.jhu.edu>
;; Save the gnus-registry file with extra line breaks.
(defun gnus-registry-cache-whitespace (filename)
(gnus-message 5 "Adding whitespace to %s" filename)
(save-excursion
(goto-char (point-min))
(while (re-search-forward "^(\\|(\\\"" nil t)
(replace-match "\n\\&" t))
(goto-char (point-min))
(while (re-search-forward " $" nil t)
(replace-match "" t t))))
(defun gnus-registry-save (&optional force)
(when (or gnus-registry-dirty force)
(let ((caching gnus-registry-entry-caching))
;; turn off entry caching, so mtime doesn't get recorded
(setq gnus-registry-entry-caching nil)
;; remove entry caches
(maphash
(lambda (key value)
(if (hash-table-p value)
(remhash key gnus-registry-hashtb)))
gnus-registry-hashtb)
;; remove empty entries
(when gnus-registry-clean-empty
(gnus-registry-clean-empty-function))
;; now trim the registry appropriately
(setq gnus-registry-alist (gnus-registry-trim
(hashtable-to-alist gnus-registry-hashtb)))
;; really save
(gnus-registry-cache-save)
(setq gnus-registry-entry-caching caching)
(setq gnus-registry-dirty nil))))
(defun gnus-registry-clean-empty-function ()
"Remove all empty entries from the registry. Returns count thereof."
(let ((count 0))
(maphash
(lambda (key value)
(unless (gnus-registry-fetch-group key)
(incf count)
(remhash key gnus-registry-hashtb)))
gnus-registry-hashtb)
count))
(defun gnus-registry-read ()
(gnus-registry-cache-read)
(setq gnus-registry-hashtb (alist-to-hashtable gnus-registry-alist))
(setq gnus-registry-dirty nil))
(defun gnus-registry-trim (alist)
"Trim alist to size, using gnus-registry-max-entries."
(if (null gnus-registry-max-entries)
alist ; just return the alist
;; else, when given max-entries, trim the alist
(let* ((timehash (make-hash-table
:size 4096
:test 'equal))
(trim-length (- (length alist) gnus-registry-max-entries))
(trim-length (if (natnump trim-length) trim-length 0)))
(maphash
(lambda (key value)
(puthash key (gnus-registry-fetch-extra key 'mtime) timehash))
gnus-registry-hashtb)
;; we use the return value of this setq, which is the trimmed alist
(setq alist
(nthcdr
trim-length
(sort alist
(lambda (a b)
(time-less-p
(cdr (gethash (car a) timehash))
(cdr (gethash (car b) timehash))))))))))
(defun alist-to-hashtable (alist)
"Build a hashtable from the values in ALIST."
(let ((ht (make-hash-table
:size 4096
:test 'equal)))
(mapc
(lambda (kv-pair)
(puthash (car kv-pair) (cdr kv-pair) ht))
alist)
ht))
(defun hashtable-to-alist (hash)
"Build an alist from the values in HASH."
(let ((list nil))
(maphash
(lambda (key value)
(setq list (cons (cons key value) list)))
hash)
list))
(defun gnus-registry-action (action data-header from &optional to method)
(let* ((id (mail-header-id data-header))
(subject (gnus-registry-simplify-subject
(mail-header-subject data-header)))
(sender (mail-header-from data-header))
(from (gnus-group-guess-full-name-from-command-method from))
(to (if to (gnus-group-guess-full-name-from-command-method to) nil))
(to-name (if to to "the Bit Bucket"))
(old-entry (gethash id gnus-registry-hashtb)))
(gnus-message 5 "Registry: article %s %s from %s to %s"
id
(if method "respooling" "going")
from
to)
;; All except copy will need a delete
(gnus-registry-delete-group id from)
(when (equal 'copy action)
(gnus-registry-add-group id from subject sender)) ; undo the delete
(gnus-registry-add-group id to subject sender)))
(defun gnus-registry-spool-action (id group &optional subject sender)
(let ((group (gnus-group-guess-full-name-from-command-method group)))
(when (and (stringp id) (string-match "\r$" id))
(setq id (substring id 0 -1)))
(gnus-message 5 "Registry: article %s spooled to %s"
id
group)
(gnus-registry-add-group id group subject sender)))
;; Function for nn{mail|imap}-split-fancy: look up all references in
;; the cache and if a match is found, return that group.
(defun gnus-registry-split-fancy-with-parent ()
"Split this message into the same group as its parent. The parent
is obtained from the registry. This function can be used as an entry
in `nnmail-split-fancy' or `nnimap-split-fancy', for example like
this: (: gnus-registry-split-fancy-with-parent)
For a message to be split, it looks for the parent message in the
References or In-Reply-To header and then looks in the registry to
see which group that message was put in. This group is returned.
See the Info node `(gnus)Fancy Mail Splitting' for more details."
(let ((refstr (or (message-fetch-field "references")
(message-fetch-field "in-reply-to")))
(nnmail-split-fancy-with-parent-ignore-groups
(if (listp nnmail-split-fancy-with-parent-ignore-groups)
nnmail-split-fancy-with-parent-ignore-groups
(list nnmail-split-fancy-with-parent-ignore-groups)))
references res)
(if refstr
(progn
(setq references (nreverse (gnus-split-references refstr)))
(mapcar (lambda (x)
(setq res (or (gnus-registry-fetch-group x) res))
(when (or (gnus-registry-grep-in-list
res
gnus-registry-unfollowed-groups)
(gnus-registry-grep-in-list
res
nnmail-split-fancy-with-parent-ignore-groups))
(setq res nil)))
references))
;; else: there were no references, now try the extra tracking
(let ((sender (message-fetch-field "from"))
(subject (gnus-registry-simplify-subject
(message-fetch-field "subject")))
(single-match t))
(when (and single-match
(gnus-registry-track-sender-p)
sender)
(maphash
(lambda (key value)
(let ((this-sender (cdr
(gnus-registry-fetch-extra key 'sender))))
(when (and single-match
this-sender
(equal sender this-sender))
;; too many matches, bail
(unless (equal res (gnus-registry-fetch-group key))
(setq single-match nil))
(setq res (gnus-registry-fetch-group key))
(gnus-message
;; raise level of messaging if gnus-registry-track-extra
(if gnus-registry-track-extra 5 9)
"%s (extra tracking) traced sender %s to group %s"
"gnus-registry-split-fancy-with-parent"
sender
(if res res "nil")))))
gnus-registry-hashtb))
(when (and single-match
(gnus-registry-track-subject-p)
subject
(< gnus-registry-minimum-subject-length (length subject)))
(maphash
(lambda (key value)
(let ((this-subject (cdr
(gnus-registry-fetch-extra key 'subject))))
(when (and single-match
this-subject
(equal subject this-subject))
;; too many matches, bail
(unless (equal res (gnus-registry-fetch-group key))
(setq single-match nil))
(setq res (gnus-registry-fetch-group key))
(gnus-message
;; raise level of messaging if gnus-registry-track-extra
(if gnus-registry-track-extra 5 9)
"%s (extra tracking) traced subject %s to group %s"
"gnus-registry-split-fancy-with-parent"
subject
(if res res "nil")))))
gnus-registry-hashtb))
(unless single-match
(gnus-message
5
"gnus-registry-split-fancy-with-parent: too many extra matches for %s"
refstr)
(setq res nil))))
(gnus-message
5
"gnus-registry-split-fancy-with-parent traced %s to group %s"
refstr (if res res "nil"))
(when (and res gnus-registry-use-long-group-names)
(let ((m1 (gnus-find-method-for-group res))
(m2 (or gnus-command-method
(gnus-find-method-for-group gnus-newsgroup-name)))
(short-res (gnus-group-short-name res)))
(if (gnus-methods-equal-p m1 m2)
(progn
(gnus-message
9
"gnus-registry-split-fancy-with-parent stripped group %s to %s"
res
short-res)
(setq res short-res))
;; else...
(gnus-message
5
"gnus-registry-split-fancy-with-parent ignored foreign group %s"
res)
(setq res nil))))
res))
(defun gnus-registry-register-message-ids ()
"Register the Message-ID of every article in the group"
(unless (gnus-parameter-registry-ignore gnus-newsgroup-name)
(dolist (article gnus-newsgroup-articles)
(let ((id (gnus-registry-fetch-message-id-fast article)))
(unless (gnus-registry-fetch-group id)
(gnus-message 9 "Registry: Registering article %d with group %s"
article gnus-newsgroup-name)
(gnus-registry-add-group
(gnus-registry-fetch-message-id-fast article)
gnus-newsgroup-name
(gnus-registry-fetch-simplified-message-subject-fast article)
(gnus-registry-fetch-sender-fast article)))))))
(defun gnus-registry-fetch-message-id-fast (article)
"Fetch the Message-ID quickly, using the internal gnus-data-list function"
(if (and (numberp article)
(assoc article (gnus-data-list nil)))
(mail-header-id (gnus-data-header (assoc article (gnus-data-list nil))))
nil))
(defun gnus-registry-simplify-subject (subject)
(if (stringp subject)
(gnus-simplify-subject subject)
nil))
(defun gnus-registry-fetch-simplified-message-subject-fast (article)
"Fetch the Subject quickly, using the internal gnus-data-list function"
(if (and (numberp article)
(assoc article (gnus-data-list nil)))
(gnus-registry-simplify-subject
(mail-header-subject (gnus-data-header
(assoc article (gnus-data-list nil)))))
nil))
(defun gnus-registry-fetch-sender-fast (article)
"Fetch the Sender quickly, using the internal gnus-data-list function"
(if (and (numberp article)
(assoc article (gnus-data-list nil)))
(mail-header-from (gnus-data-header
(assoc article (gnus-data-list nil))))
nil))
(defun gnus-registry-grep-in-list (word list)
(when word
(memq nil
(mapcar 'not
(mapcar
(lambda (x)
(string-match x word))
list)))))
(defun gnus-registry-fetch-extra (id &optional entry)
"Get the extra data of a message, based on the message ID.
Returns the first place where the trail finds a nonstring."
(let ((entry-cache (gethash entry gnus-registry-hashtb)))
(if (and entry
(hash-table-p entry-cache)
(gethash id entry-cache))
(gethash id entry-cache)
;; else, if there is no caching possible...
(let ((trail (gethash id gnus-registry-hashtb)))
(when (listp trail)
(dolist (crumb trail)
(unless (stringp crumb)
(return (gnus-registry-fetch-extra-entry crumb entry id)))))))))
(defun gnus-registry-fetch-extra-entry (alist &optional entry id)
"Get the extra data of a message, or a specific entry in it.
Update the entry cache if needed."
(if (and entry id)
(let ((entry-cache (gethash entry gnus-registry-hashtb))
entree)
(when gnus-registry-entry-caching
;; create the hash table
(unless (hash-table-p entry-cache)
(setq entry-cache (make-hash-table
:size 4096
:test 'equal))
(puthash entry entry-cache gnus-registry-hashtb))
;; get the entree from the hash table or from the alist
(setq entree (gethash id entry-cache)))
(unless entree
(setq entree (assq entry alist))
(when gnus-registry-entry-caching
(puthash id entree entry-cache)))
entree)
alist))
(defun gnus-registry-store-extra (id extra)
"Store the extra data of a message, based on the message ID.
The message must have at least one group name."
(when (gnus-registry-group-count id)
;; we now know the trail has at least 1 group name, so it's not empty
(let ((trail (gethash id gnus-registry-hashtb))
(old-extra (gnus-registry-fetch-extra id))
entry-cache)
(dolist (crumb trail)
(unless (stringp crumb)
(dolist (entry crumb)
(setq entry-cache (gethash (car entry) gnus-registry-hashtb))
(when entry-cache
(remhash id entry-cache))))
(puthash id (cons extra (delete old-extra trail))
gnus-registry-hashtb)
(setq gnus-registry-dirty t)))))
(defun gnus-registry-store-extra-entry (id key value)
"Put a specific entry in the extras field of the registry entry for id."
(let* ((extra (gnus-registry-fetch-extra id))
(alist (cons (cons key value)
(gnus-assq-delete-all key (gnus-registry-fetch-extra id)))))
(gnus-registry-store-extra id alist)))
(defun gnus-registry-fetch-group (id)
"Get the group of a message, based on the message ID.
Returns the first place where the trail finds a group name."
(when (gnus-registry-group-count id)
;; we now know the trail has at least 1 group name
(let ((trail (gethash id gnus-registry-hashtb)))
(dolist (crumb trail)
(when (stringp crumb)
(return (if gnus-registry-use-long-group-names
crumb
(gnus-group-short-name crumb))))))))
(defun gnus-registry-group-count (id)
"Get the number of groups of a message, based on the message ID."
(let ((trail (gethash id gnus-registry-hashtb)))
(if (and trail (listp trail))
(apply '+ (mapcar (lambda (x) (if (stringp x) 1 0)) trail))
0)))
(defun gnus-registry-delete-group (id group)
"Delete a group for a message, based on the message ID."
(when group
(when id
(let ((trail (gethash id gnus-registry-hashtb))
(group (gnus-group-short-name group)))
(puthash id (if trail
(delete group trail)
nil)
gnus-registry-hashtb))
;; now, clear the entry if there are no more groups
(when gnus-registry-trim-articles-without-groups
(unless (gnus-registry-group-count id)
(gnus-registry-delete-id id)))
;; is this ID still in the registry?
(when (gethash id gnus-registry-hashtb)
(gnus-registry-store-extra-entry id 'mtime (current-time))))))
(defun gnus-registry-delete-id (id)
"Delete a message ID from the registry."
(when (stringp id)
(remhash id gnus-registry-hashtb)
(maphash
(lambda (key value)
(when (hash-table-p value)
(remhash id value)))
gnus-registry-hashtb)))
(defun gnus-registry-add-group (id group &optional subject sender)
"Add a group for a message, based on the message ID."
(when group
(when (and id
(not (string-match "totally-fudged-out-message-id" id)))
(let ((full-group group)
(group (if gnus-registry-use-long-group-names
group
(gnus-group-short-name group))))
(gnus-registry-delete-group id group)
(unless gnus-registry-use-long-group-names ;; unnecessary in this case
(gnus-registry-delete-group id full-group))
(let ((trail (gethash id gnus-registry-hashtb)))
(puthash id (if trail
(cons group trail)
(list group))
gnus-registry-hashtb)
(when (and (gnus-registry-track-subject-p)
subject)
(gnus-registry-store-extra-entry
id
'subject
(gnus-registry-simplify-subject subject)))
(when (and (gnus-registry-track-sender-p)
sender)
(gnus-registry-store-extra-entry
id
'sender
sender))
(gnus-registry-store-extra-entry id 'mtime (current-time)))))))
(defun gnus-registry-clear ()
"Clear the Gnus registry."
(interactive)
(setq gnus-registry-alist nil)
(setq gnus-registry-hashtb (alist-to-hashtable gnus-registry-alist))
(setq gnus-registry-dirty t))
;;;###autoload
(defun gnus-registry-initialize ()
(interactive)
(setq gnus-registry-install t)
(gnus-registry-install-hooks)
(gnus-registry-read))
;;;###autoload
(defun gnus-registry-install-hooks ()
"Install the registry hooks."
(interactive)
(add-hook 'gnus-summary-article-move-hook 'gnus-registry-action)
(add-hook 'gnus-summary-article-delete-hook 'gnus-registry-action)
(add-hook 'gnus-summary-article-expire-hook 'gnus-registry-action)
(add-hook 'nnmail-spool-hook 'gnus-registry-spool-action)
(add-hook 'gnus-save-newsrc-hook 'gnus-registry-save)
(add-hook 'gnus-read-newsrc-el-hook 'gnus-registry-read)
(add-hook 'gnus-summary-prepare-hook 'gnus-registry-register-message-ids))
(defun gnus-registry-unload-hook ()
"Uninstall the registry hooks."
(interactive)
(remove-hook 'gnus-summary-article-move-hook 'gnus-registry-action)
(remove-hook 'gnus-summary-article-delete-hook 'gnus-registry-action)
(remove-hook 'gnus-summary-article-expire-hook 'gnus-registry-action)
(remove-hook 'nnmail-spool-hook 'gnus-registry-spool-action)
(remove-hook 'gnus-save-newsrc-hook 'gnus-registry-save)
(remove-hook 'gnus-read-newsrc-el-hook 'gnus-registry-read)
(remove-hook 'gnus-summary-prepare-hook 'gnus-registry-register-message-ids))
(add-hook 'gnus-registry-unload-hook 'gnus-registry-unload-hook)
(when gnus-registry-install
(gnus-registry-install-hooks)
(gnus-registry-read))
;; TODO: a lot of things
(provide 'gnus-registry)
;;; arch-tag: 5cba0a32-718a-4a97-8c91-0a15af21da94
;;; gnus-registry.el ends here
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