I 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.
Here is a finalized patch for this. The first hunk of the patch is the
documentation change, so you can see there how it's supposed to work.
Let me know what you think.
