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: Fabien COELHO <coelho@cri.ensmp.fr>
Cc: Greg Stark <stark@mit.edu>, Erik Rijkers <er@xs4all.nl>, Tom Lane <tgl@sss.pgh.pa.us>, 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: 2017-02-13T07:55:54Z
Lists: pgsql-hackers

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>
> Maybe this can be a discussed in a follow-up patch and Corey should
> proceed to finalize the if patch?


In the event that we can leave prompting to a later patch, here are the v12
highlights:
- created conditional.h and conditional.c which contain the functions with
stack-ish push/pop/peek/poke names
- now all non-test, non-doc changes are in src/bin/psql
- moved conditional stack out of scan_state, stack state maintained by
mainloop.c/startup.c, passed to HandleSlashCommands
- documentation encourages the user to employ ON_ERROR_STOP when using
conditionals

Commits

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

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