gnus: Filling In Threads
3.9.1.2 Filling In Threads
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‘gnus-fetch-old-headers’
If non-‘nil’, Gnus will attempt to build old threads by fetching
more old headers—headers to articles marked as read. If you would
like to display as few summary lines as possible, but still connect
as many loose threads as possible, you should set this variable to
‘some’ or a number. If you set it to a number, no more than that
number of extra old headers will be fetched. In either case,
fetching old headers only works if the back end you are using
carries overview files—this would normally be ‘nntp’, ‘nnspool’,
‘nnml’, and ‘nnmaildir’. Also remember that if the root of the
thread has been expired by the server, there’s not much Gnus can do
about that.
This variable can also be set to ‘invisible’. This won’t have any
visible effects, but is useful if you use the ‘A T’ command a lot
(
Finding the Parent).
The server has to support NOV for any of this to work.
This feature can seriously impact performance it ignores all
locally cached header entries. Setting it to ‘t’ for groups for a
server that doesn’t expire articles (such as news.gmane.org), leads
to very slow summary generation.
‘gnus-fetch-old-ephemeral-headers’
Same as ‘gnus-fetch-old-headers’, but only used for ephemeral
newsgroups.
‘gnus-build-sparse-threads’
Fetching old headers can be slow. A low-rent similar effect can be
gotten by setting this variable to ‘some’. Gnus will then look at
the complete ‘References’ headers of all articles and try to string
together articles that belong in the same thread. This will leave
“gaps” in the threading display where Gnus guesses that an article
is missing from the thread. (These gaps appear like normal summary
lines. If you select a gap, Gnus will try to fetch the article in
question.) If this variable is ‘t’, Gnus will display all these
“gaps” without regard for whether they are useful for completing
the thread or not. Finally, if this variable is ‘more’, Gnus won’t
cut off sparse leaf nodes that don’t lead anywhere. This variable
is ‘nil’ by default.
‘gnus-read-all-available-headers’
This is a rather obscure variable that few will find useful. It’s
intended for those non-news newsgroups where the back end has to
fetch quite a lot to present the summary buffer, and where it’s
impossible to go back to parents of articles. This is mostly the
case in the web-based groups.
If you don’t use those, then it’s safe to leave this as the default
‘nil’. If you want to use this variable, it should be a regexp
that matches the group name, or ‘t’ for all groups.
Info Catalog
gnus: Loose Threads
gnus: Customizing Threading
gnus: More Threading