Horton

Re: Variable substitution in psql backtick expansion

Tom Lane <tgl@sss.pgh.pa.us>

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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Fabien COELHO <coelho@cri.ensmp.fr>
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: 2017-08-26T19:07:48Z
Lists: pgsql-hackers 
Fabien COELHO <coelho@cri.ensmp.fr> writes:
> 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.  Modern psql does still
talk to ancient servers (I tried 11devel against 7.2 just now, to be
sure).  The stuff in describe.c may not work well, but basic functionality
is there and I don't want to break it.

			regards, tom lane

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.