gnus: To From Newsgroups
3.1.2 To From Newsgroups
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In some groups (particularly in archive groups), the ‘From’ header isn’t
very interesting, since all the articles there are written by you. To
display the information in the ‘To’ or ‘Newsgroups’ headers instead, you
need to decide three things: What information to gather; where to
display it; and when to display it.
1. The reading of extra header information is controlled by the
‘gnus-extra-headers’. This is a list of header symbols. For
instance:
(setq gnus-extra-headers
'(To Newsgroups X-Newsreader))
This will result in Gnus trying to obtain these three headers, and
storing it in header structures for later easy retrieval.
2. The value of these extra headers can be accessed via the
‘gnus-extra-header’ function. Here’s a format line spec that will
access the ‘X-Newsreader’ header:
"%~(form (gnus-extra-header 'X-Newsreader))@"
3. The ‘gnus-ignored-from-addresses’ variable says when the ‘%f’
summary line spec returns the ‘To’, ‘Newsreader’ or ‘From’ header.
If this regexp matches the contents of the ‘From’ header, the value
of the ‘To’ or ‘Newsreader’ headers are used instead.
To distinguish regular articles from those where the ‘From’ field
has been swapped, a string is prefixed to the ‘To’ or ‘Newsgroups’
header in the summary line. By default the string is ‘-> ’ for
‘To’ and ‘=> ’ for ‘Newsgroups’, you can customize these strings
with ‘gnus-summary-to-prefix’ and ‘gnus-summary-newsgroup-prefix’.
A related variable is ‘nnmail-extra-headers’, which controls when to
include extra headers when generating overview (NOV) files. If you have
old overview files, you should regenerate them after changing this
variable, by entering the server buffer using ‘^’, and then ‘g’ on the
appropriate mail server (e.g., nnml) to cause regeneration.
You also have to instruct Gnus to display the data by changing the
‘%n’ spec to the ‘%f’ spec in the ‘gnus-summary-line-format’ variable.
In summary, you’d typically put something like the following in
‘~/.gnus.el’:
(setq gnus-extra-headers
'(To Newsgroups))
(setq nnmail-extra-headers gnus-extra-headers)
(setq gnus-summary-line-format
"%U%R%z%I%(%[%4L: %-23,23f%]%) %s\n")
(setq gnus-ignored-from-addresses
"Your Name Here")
(The values listed above are the default values in Gnus. Alter them
to fit your needs.)
A note for news server administrators, or for users who wish to try
to convince their news server administrator to provide some additional
support:
The above is mostly useful for mail groups, where you have control
over the NOV files that are created. However, if you can persuade your
nntp admin to add (in the usual implementation, notably INN):
Newsgroups:full
to the end of her ‘overview.fmt’ file, then you can use that just as
you would the extra headers from the mail groups.
Info Catalog
gnus: Summary Buffer Lines
gnus: Summary Buffer Format
gnus: Summary Buffer Mode Line