Re: PSQL commands: \quit_if, \quit_unless

Hello Corey,

> This patch adds two very simple psql commands: \quit_if and \quit_unless.

A few comments about the feature design:

I'm unsure about the name, esp with '_'. There are some \lo_* commands, 
but others rely on pasted words (\crosstabview, \errverbose, ...).

I'm wondering if an simplistic interpreted \if \elsif/\else \fi would make 
more sense:

Quitting seems a little bit definitive, and means that if I have some 
alternatives then I have to have something that relaunch another script 
outside...

When \includes are process, does \quit stop the include or the full 
script. I'm afraid it is the script.

Now probably an \if... would have also some drawbacks, but ISTM that there 
could be less of them.

There is no test provided with the patch.

-- 
Fabien.