Horton

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

Corey Huinker <corey.huinker@gmail.com>

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From: Corey Huinker <corey.huinker@gmail.com>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Fabien COELHO <coelho@cri.ensmp.fr>, Greg Stark <stark@mit.edu>, Erik Rijkers <er@xs4all.nl>, Robert Haas <robertmhaas@gmail.com>, Daniel Verite <daniel@manitou-mail.org>, Jim Nasby <Jim.Nasby@bluetreble.com>, PostgreSQL <pgsql-hackers@postgresql.org>, pgsql-hackers-owner@postgresql.org
Date: 2017-02-22T22:52:28Z
Lists: pgsql-hackers 
On Wed, Feb 22, 2017 at 5:11 PM, Corey Huinker <corey.huinker@gmail.com>
wrote:

> Dunno, that sounds a lot like an "if the only tool I have is a hammer,
>> then this must be a nail" argument.
>
>
> More of a "don't rock the boat more than absolutely necessary", but
> knowing that adding another global struct might be welcomed is good to know.
>
>

After some research, GetVariable is called by psql_get_variable, which is
one of the callback functions passed to psql_scan_create(). So passing a
state variable around probably isn't going to work and PsqlFileState now
looks like the best option.

Commits

  1. Support \if ... \elif ... \else ... \endif in psql scripting.

  2. Add a "void *" passthrough pointer for psqlscan.l's callback functions.