On Mon, 12 Feb 2018 09:27:04 +0000 Ralph Corderoy <ra...@inputplus.co.uk> wrote:
Ralph Corderoy writes:
> Hi Paul,
> > i just don't know whether MH can attract new users through a rewrite.
> That wouldn't be the aim.  The aim would be for the existing users to
> have a code base that allowed more rapid, stable development of new
> features, deprecating old warts, and improving consistency.
> For example, whilst I like the Unix idiom of one command to do one thing
> well, I do find myself doing a series of picks, marks, and scans to
> whittle down emails whereas having a consistent, planned, notation that
> can be used wherever a message number can be given would lessen the
> iterations a lot.  `seq=-3' is nice, but I can't do `seq:-3:2', for
> example.  And overall it's warty, so warty no one replied to my
> http://lists.nongnu.org/archive/html/nmh-workers/2017-09/msg00014.html
> :-)

I don't remember your message but I did look at message
sequence number selection in some detail when I was
implementing it in Go. My initial implemention just treated it
as simple number sequences independent of context but messages
that match a selection expession depend on which messages
exist.  As an example, if you have messages 1 2 5 8 in a
mailbox, Thus 5:3 match es 5 & 8.  And the start message need
not exist.  10:-2 matchs 5 & 8 but 10:1 fails.  The semantics
are fairly consistent. Except for last!  last:2 matches 5 & 8
but 8:2 matches only 8.  But last is a small anomaly.

I can see extending it so that an expressions as seq:-3:2
(which would be equivalent to seq=-3:2) works but given the
context sensitivity, I think it would be rather confusing.
But I admit I have often wanted next:n or prev:n.


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