enhancement to rn = index command

[Per Hedeland]

In article <3063 at haddock.ISC.COM> trb at haddock.isc.com (Andrew Tannenbaum) writes:
>	This patch lets you use printf-style formatting in rn strings,
>	most usefully, the SUBJLINE variable.
>
>	A sample of the output is just below.  The format used is
>	-ESUBJLINE="%:-50.50s %:.24t"

This is actually quite unnecessary, you can achieve the same effect with
standard rn and

-ESUBJLINE="\
%(%s                                                  =\
^\\(..................................................\\)?%1) \
%(%t=^\\(........................\\)?%1:%t)"

(Your example seems to use 45 cols for the subject, though, which is probably
better on an 80 col terminal.) Of course, it's a bit more complicated, but
how often do you change your SUBJLINE? (Here is mine, BTW, created from the
"sample" used the previous time this fix was suggested:

-ESUBJLINE="\
%(%(%f=(\\(.*[^ ].*\\))$?%1:%f)               =^\\(...............\\)?%1) \
(%(    %[lines]=\\(....\\)$?%1)) \
%(%[subject]=^\\(...................................................\\)?\
%1:%[subject])"

)

>	I also fixed the /foo/= bug (it wasn't checking SUBJLINE).  I

I guess it's debatable whether this is correct. I would say that the
documentation is (slightly) inaccurate when saying that = prints the "subject".

>	I notice that the %s fields have all the Re's stripped off, which
>	isn't quite right, but I haven't dealt with that.  (That's an
>	existing bug, or at least the doc for = says that it uses %s by
>	default).

If you want them, just use %[subject] instead of %s above. (Surely, nobody
uses the defaults? :-)

--Per Hedeland
per at erix.ericsson.se  or  {mcvax,uunet}!enea!erix!per