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: "Daniel Verite" <daniel(at)manitou-mail(dot)org>
Cc: "Corey Huinker" <corey(dot)huinker(at)gmail(dot)com>, "Fabien COELHO" <coelho(at)cri(dot)ensmp(dot)fr>, "PostgreSQL" <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: \if, \elseif, \else, \endif (was Re: PSQL commands: \quit_if, \quit_unless)
Date: 2017-01-24 19:38:33
Message-ID: 10528.1485286713@sss.pgh.pa.us
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"Daniel Verite" <daniel(at)manitou-mail(dot)org> writes:
> ISTM that it's important that eventually ParseVariableBool()
> and \if agree on what evaluates to true and false (and the
> more straightforward way to achieve that is by \if calling
> directly ParseVariableBool), but that it's not productive that we
> discuss /if issues relatively to the behavior of ParseVariableBool()
> in HEAD at the moment, as it's likely to change.

AFAIK we do have consensus on changing its behavior to disallow
assignment of invalid values. It's just a matter of getting the
patch to be stylistically nice.

regards, tom lane

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