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Re: Sorting on compound keys?


From: Andreas Röhler
Subject: Re: Sorting on compound keys?
Date: Thu, 26 May 2011 08:28:10 +0200
User-agent: Mozilla/5.0 (X11; U; Linux i686; de; rv:1.9.2.17) Gecko/20110414 SUSE/3.1.10 Thunderbird/3.1.10

Am 26.05.2011 00:08, schrieb Tim Landscheidt:
Andreas Röhler<andreas.roehler@easy-emacs.de>  wrote:

sometimes I want to sort unified diffs of CSV files (sepa-
rated by tabs (here: \t)):

| +A 1\t1\tx
| +A 1\t2\ty
| +B 2\t3\tz
| -A 1\t1\tx
| -B 2\t2\ty
| -B 2\t3\tz

by the second column, then the first column, then "+" vs.
"-". Unfortunately, it seems that sort-regexp-fields doesn't
allow more than one match field as a key. sort-fields
doesn't work either as it requires the fields to be sur-
rounded by white space (no "+" vs. "-") and doesn't allow
white space inside the fields.

    Is there any function in vanilla Emacs (23.1.1) that I
missed? I looked at pimping sort-regexp-fields, but it seems
to me that sort-subr would have to be rewritten from scratch
to achieve sorting on compound keys.

last time I looked into that feature was missing indeed.
However, didn't look for a need of re-write from the
scratch, just to extend to existing routine - ie. introduce
one or more levels of sorting.

I remember our discussion in de.comp.editoren :-), but as I
read sort-subr it is hard-coded that the sort key is one
literal, continuous part of the buffer as sort-lists is a
list of buffer positions.

Tim





sort-subr takes functions to determine the fields to sort.

As for the functions as arguments, maybe have a look at
`ar-th-sort' in thingatpt-utils-base.el

https://code.launchpad.net/s-x-emacs-werkstatt/

Cheers,

Andreas






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