Re: \if, \elseif, \else, \endif (was Re: PSQL commands: \quit_if, \quit_unless)

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Fabien COELHO <coelho(at)cri(dot)ensmp(dot)fr>
Cc: Corey Huinker <corey(dot)huinker(at)gmail(dot)com>, Daniel Verite <daniel(at)manitou-mail(dot)org>, "David G(dot) Johnston" <david(dot)g(dot)johnston(at)gmail(dot)com>, Greg Stark <stark(at)mit(dot)edu>, Erik Rijkers <er(at)xs4all(dot)nl>, Robert Haas <robertmhaas(at)gmail(dot)com>, Jim Nasby <Jim(dot)Nasby(at)bluetreble(dot)com>, PostgreSQL <pgsql-hackers(at)postgresql(dot)org>, pgsql-hackers-owner(at)postgresql(dot)org
Subject: Re: \if, \elseif, \else, \endif (was Re: PSQL commands: \quit_if, \quit_unless)
Date: 2017-03-30 04:15:59
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Fabien COELHO <coelho(at)cri(dot)ensmp(dot)fr> writes:
>> New Patch v29: Now with less coverage!

> Patch applies cleanly. Make check ok. Feature still works!

I've been hacking on this for about two full days now, and have gotten
it to a point where I think it's committable. Aside from cosmetic
changes, I've made it behave reasonably for cases where \if is used
on portions of a query, for instance

\if :something
FROM table;

which as I mentioned a long time ago is something that people will
certainly expect to work. I also cleaned up a lot of corner-case
discrepancies between how much text is consumed in active-branch and
inactive-branch cases (OT_FILEPIPE is a particularly nasty case in that
regard :-()

I plan to read this over again tomorrow and then push it, if there are
not objections/corrections.

regards, tom lane

Attachment Content-Type Size
psql-if-v30.patch text/x-diff 113.1 KB

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