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, unless it matches one of the entries in
-gnus-registry-unfollowed-groups or
-nnmail-split-fancy-with-parent-ignore-groups.
+returned, unless `gnus-registry-follow-group-p' return nil for
+that group.
See the Info node `(gnus)Fancy Mail Splitting' for more details."
- (let* ((refstr (or (message-fetch-field "references") "")) ; guarantee string
- (reply-to (message-fetch-field "in-reply-to")) ; grab reply-to
+ (let* ((refstr (or (message-fetch-field "references") "")) ; guaranteed
+ (reply-to (message-fetch-field "in-reply-to")) ; may be nil
;; now, if reply-to is valid, append it to the References
(refstr (if reply-to
(concat refstr " " reply-to)
refstr))
- (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)))
- res)
- ;; the references string must be valid and parse to valid references
- (if (and refstr (gnus-extract-references refstr))
- (dolist (reference (nreverse (gnus-extract-references refstr)))
- (setq res (or (gnus-registry-fetch-group reference) 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)))
-
- ;; else: there were no references, now try the extra tracking
- (let ((sender (gnus-string-remove-all-properties(message-fetch-field "from")))
- (subject (gnus-string-remove-all-properties
- (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))
- (when (and sender res)
- (gnus-message
- ;; raise level of messaging if gnus-registry-track-extra
- (if gnus-registry-track-extra 7 9)
- "%s (extra tracking) traced sender %s to group %s"
- "gnus-registry-split-fancy-with-parent"
- sender
- res)))))
- 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))
- (when (and subject res)
- (gnus-message
- ;; raise level of messaging if gnus-registry-track-extra
- (if gnus-registry-track-extra 7 9)
- "%s (extra tracking) traced subject %s to group %s"
- "gnus-registry-split-fancy-with-parent"
- subject
- res)))))
- gnus-registry-hashtb))
- (unless single-match
- (gnus-message
- 3
- "gnus-registry-split-fancy-with-parent: too many extra matches for %s"
- refstr)
- (setq res nil))))
- (when (and refstr res)
- (gnus-message
- 5
- "gnus-registry-split-fancy-with-parent traced %s to group %s"
- refstr res))
-
- (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
+ ;; these may not be used, but the code is cleaner having them up here
+ (sender (gnus-string-remove-all-properties
+ (message-fetch-field "from")))
+ (subject (gnus-string-remove-all-properties
+ (gnus-registry-simplify-subject
+ (message-fetch-field "subject"))))
+
+ (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)))
+ (log-agent "gnus-registry-split-fancy-with-parent")
+ found)
+
+ ;; this is a big if-else statement. it uses
+ ;; gnus-registry-post-process-groups to filter the results after
+ ;; every step.
+ (cond
+ ;; the references string must be valid and parse to valid references
+ ((and refstr (gnus-extract-references refstr))
+ (dolist (reference (nreverse (gnus-extract-references refstr)))
+ (gnus-message
+ 9
+ "%s is looking for matches for reference %s from [%s]"
+ log-agent reference refstr)
+ (dolist (group (gnus-registry-fetch-groups reference))
+ (when (and group (gnus-registry-follow-group-p group))
(gnus-message
- 9
- "gnus-registry-split-fancy-with-parent stripped group %s to %s"
- res
- short-res)
- (setq res short-res))
- ;; else...
+ 7
+ "%s traced the reference %s from [%s] to group %s"
+ log-agent reference refstr group)
+ (push group found))))
+ ;; filter the found groups and return them
+ (setq found (gnus-registry-post-process-groups "references" refstr found)))
+
+ ;; else: there were no matches, now try the extra tracking by sender
+ ((and (gnus-registry-track-sender-p)
+ sender)
+ (maphash
+ (lambda (key value)
+ (let ((this-sender (cdr
+ (gnus-registry-fetch-extra key 'sender)))
+ matches)
+ (when (and this-sender
+ (equal sender this-sender))
+ (setq found (append (gnus-registry-fetch-groups key) found))
+ (push key matches)
+ (gnus-message
+ ;; raise level of messaging if gnus-registry-track-extra
+ (if gnus-registry-track-extra 7 9)
+ "%s (extra tracking) traced sender %s to groups %s (keys %s)"
+ log-agent sender found matches))))
+ gnus-registry-hashtb)
+ ;; filter the found groups and return them
+ (setq found (gnus-registry-post-process-groups "sender" sender found)))
+
+ ;; else: there were no matches, now try the extra tracking by subject
+ ((and (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)))
+ matches)
+ (when (and this-subject
+ (equal subject this-subject))
+ (setq found (append (gnus-registry-fetch-groups key) found))
+ (push key matches)
+ (gnus-message
+ ;; raise level of messaging if gnus-registry-track-extra
+ (if gnus-registry-track-extra 7 9)
+ "%s (extra tracking) traced subject %s to groups %s (keys %s)"
+ log-agent subject found matches))))
+ gnus-registry-hashtb)
+ ;; filter the found groups and return them
+ (setq found (gnus-registry-post-process-groups "subject" subject found))))))
+
+(defun gnus-registry-post-process-groups (mode key groups)
+ "Modifies GROUPS obtained by searching by MODE for KEY to determine which ones to follow.
+
+MODE can be 'subject' or 'sender' for example. The KEY is the
+value by which MODE was searched.
+
+Transforms each group name to the equivalent short name.
+
+Checks if the current Gnus method (from `gnus-command-method' or
+from `gnus-newsgroup-name') is the same as the group's method.
+This is not possible if gnus-registry-use-long-group-names is
+false. Foreign methods are not supported so they are rejected.
+
+Reduces the list to a single group, or complains if that's not
+possible."
+ (let ((log-agent "gnus-registry-post-process-group")
+ out)
+ (if gnus-registry-use-long-group-names
+ (dolist (group groups)
+ (let ((m1 (gnus-find-method-for-group group))
+ (m2 (or gnus-command-method
+ (gnus-find-method-for-group gnus-newsgroup-name)))
+ (short-name (gnus-group-short-name group)))
+ (if (gnus-methods-equal-p m1 m2)
+ (progn
+ ;; this is REALLY just for debugging
+ (gnus-message
+ 10
+ "%s stripped group %s to %s"
+ log-agent group short-name)
+ (unless (member short-name out)
+ (push short-name out)))
+ ;; else...
+ (gnus-message
+ 7
+ "%s ignored foreign group %s"
+ log-agent group))))
+ (setq out groups))
+ (when (cdr-safe out)
(gnus-message
- 7
- "gnus-registry-split-fancy-with-parent ignored foreign group %s"
- res)
- (setq res nil))))
- res))
+ 5
+ "%s: too many extra matches (%s) for %s %s. Returning none."
+ log-agent out mode key)
+ (setq out nil))
+ out))
+
+(defun gnus-registry-follow-group-p (group)
+ "Determines if a group name should be followed.
+Consults `gnus-registry-unfollowed-groups' and
+`nnmail-split-fancy-with-parent-ignore-groups'."
+ (not (or (gnus-registry-grep-in-list
+ group
+ gnus-registry-unfollowed-groups)
+ (gnus-registry-grep-in-list
+ group
+ nnmail-split-fancy-with-parent-ignore-groups))))
(defun gnus-registry-wash-for-keywords (&optional force)
(interactive)
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