Re: nnmail-split-fancy-with-parent usage is unclear

[Kai.Grossjohann@CS.Uni-Dortmund.DE (Kai Großjohann)]

On 01 Jan 2001, Ted Zlatanov wrote:

> How do I use nnmail-split-fancy-with-parent (in nnmail.el)?

The node `Fancy Mail Splitting' in the Gnus info file has the
following text in the current version.  Does that give enough info?

/----
|    `nnmail-split-fancy-with-parent' is a function which allows you to
| split followups into the same groups their parents are in.  Sometimes
| you can't make splitting rules for all your mail.  For example, your
| boss might send you personal mail regarding different projects you are
| working on, and as you can't tell your boss to put a distinguishing
| string into the subject line, you have to resort to manually moving the
| messages into the right group.  With this function, you only have to do
| it once per thread.
| 
|    To use this feature, you have to set `nnmail-treat-duplicates' to a
| non-nil value.  And then you can include
| `nnmail-split-fancy-with-parent' using the colon feature, like so:
|      (setq nnmail-split-fancy
|            '(| (: nnmail-split-fancy-with-parent)
|                ;; other splits go here
|              ))
| 
|    This feature works as follows: when `nnmail-treat-duplicates' is
| non-nil, Gnus records the message id of every message it sees in the
| file specified by the variable `nnmail-message-id-cache-file', together
| with the group it is in (the group is omitted for non-mail messages).
| When mail splitting is invoked, the function
| `nnmail-split-fancy-with-parent' then looks at the References (and
| In-Reply-To) header of each message to split and searches the file
| specified by `nnmail-message-id-cache-file' for the message ids.  When
| it has found a parent, it returns the corresponding group name.  It is
| recommended that you set `nnmail-message-id-cache-length' to a somewhat
| higher number than the default so that the message ids are still in the
| cache.  (A value of 5000 appears to create a file some 300 kBytes in
| size.)  When `nnmail-cache-accepted-message-ids' is non-nil, Gnus also
| records the message ids of moved articles, so that the followup
| messages goes into the new group.
\----

If this doesn't give the info, the manual should be fixed.  (Also,
the function itself should be documented, I guess.  Hm.)

kai
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