I have added a link to this on the TODO list:
Add "auto" expanded mode that outputs in expanded format if "wrapped"mode can't wrap the output to the screen width
*Re: psql wrapped format default for backslash-d commands *
http://archives.postgresql.org/pgsql-hackers/2010-12/msg01638.php
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Peter Eisentraut wrote:
> I have often found myself wanting that psql automatically switch between
> normal and \x mode depending on the width of the output. Would others
> find this useful?
>
> Attached is a crude demo patch. Enable with \pset expanded auto.
>
[ Attachment, skipping... ]
>
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-- Bruce Momjian <bruce@momjian.us> http://momjian.us EnterpriseDB
http://enterprisedb.com
+ It's impossible for everything to be true. +