Horton

Re: Variable substitution in psql backtick expansion

Fabien COELHO <coelho@cri.ensmp.fr>

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From: Fabien COELHO <coelho@cri.ensmp.fr>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Robert Haas <robertmhaas@gmail.com>, Pavel Stehule <pavel.stehule@gmail.com>, Corey Huinker <corey.huinker@gmail.com>, Daniel Verite <daniel@manitou-mail.org>, PostgreSQL Developers <pgsql-hackers@postgresql.org>
Date: 2017-08-27T06:13:15Z
Lists: pgsql-hackers 
>> Spending developer time to write code for the hypothetical someone running
>> a psql version 11 linked to a libpq < 7.4, if it can even link, does not
>> look like a very good investment... Anyway, here is required the update.
>
> The question is the server's version, not libpq.

Ok.

> Modern psql does still talk to ancient servers (I tried 11devel against 
> 7.2 just now, to be sure).

Wow:-)

> The stuff in describe.c may not work well, but basic functionality
> is there and I don't want to break it.

Ok. Then the updated patch should work, although I do not have a setup to 
test that easily.

-- 
Fabien.

Commits

  1. Add psql variables showing server version and psql version.

  2. Reformat psql's --help=variables output.

  3. Remove reinvention of stringify macro.

  4. Allow psql variable substitution to occur in backtick command strings.