feature request: ability to use occur within *Occur* buffer

[Benjamin Rutt]

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Please write in English, because the Emacs maintainers do not have
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In GNU Emacs 20.7.1 (i386-redhat-linux-gnu, X toolkit)
 of Tue Jun 13 2000 on porky.devel.redhat.com
configured using `configure  --mandir=/usr/man --infodir=/usr/info 
--prefix=/usr --libexecdir=/usr/lib --sharedstatedir=/var --with-gcc --with-pop 
--with-x-toolkit i386-redhat-linux-gnu'

Please describe exactly what actions triggered the bug
and the precise symptoms of the bug:

This is not a bug per se, it's more of a feature request.  The problem
is, you cannot run M-x occur within an *Occur* results buffer.
Running occur within occur would be useful because you could refine
partial results.  It is often easier to think about a complicated
occur regexp as a combination of two simpler regexps, rather than
having to draw up the complicated regexp in one shot.  (much like it
is easier to do 'cat foo | grep "regex1" | grep "regex2"' than just
'cat foo | grep "\(regex1\|regex2\)"'.  

The first thing occur does is erase the *Occur* buffer, so this
doesn't work currently.  Maybe a user customization option should be
to have a variable, say occur-uniquify-results-buffer, that if set to
t will simply call (rename-uniquely) on each new occur buffer.  Or,
someone else suggested that it would be neat to have occur buffers
named "*Occurences of foo.*bar in BAZ", which would be convenient from
a buffer-switching perspective.  Both of these solutions would be at
the expense of having to manage possibly many more old occur buffers,
but for me the expense would be worth it in some cases (and I could
control it by the value of occur-uniquify-results-buffer).

Thanks,
Benjamin Rutt
brutt@bloomington.in.us

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