Re: allow psql to watch \dt

Justin Pryzby <pryzby(at)telsasoft(dot)com> writes:
> I thought that would be desirable, although I don't see any better way of
> getting there than this.

Hm, but a lot of the \d commands involve more than one underlying query,
as well as a bunch of postprocessing. I doubt that the approach you seem
to be using here can handle such cases.

I think you have also stomped all over the semantics of
query-buffer-related commands that are executed in the vicinity of a \d.
Up to now, \d didn't change the query buffer. That has its uses, eg

select somecol
\dt some* -- how's that table spelled again?
from sometable;

We could maybe think about making it work by moving the \watch repetition
up a level, so that exec_command() as a whole would be repeated ... but
I wonder what people would think repetition of other commands such as \i,
\e, \r, \if, etc etc should mean.

On the whole I think this is not a can of worms I want to open. There's
a clear distinction right now between plain SQL and backslash commands,
and this is going to fuzz that in ways that are hard to predict the
consequences of.

regards, tom lane