| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Corey Huinker <corey(dot)huinker(at)gmail(dot)com> |
| Cc: | Fabien COELHO <coelho(at)cri(dot)ensmp(dot)fr>, Daniel Verite <daniel(at)manitou-mail(dot)org>, "David G(dot) Johnston" <david(dot)g(dot)johnston(at)gmail(dot)com>, Greg Stark <stark(at)mit(dot)edu>, Erik Rijkers <er(at)xs4all(dot)nl>, Robert Haas <robertmhaas(at)gmail(dot)com>, Jim Nasby <Jim(dot)Nasby(at)bluetreble(dot)com>, PostgreSQL <pgsql-hackers(at)postgresql(dot)org>, pgsql-hackers-owner(at)postgresql(dot)org |
| Subject: | Re: \if, \elseif, \else, \endif (was Re: PSQL commands: \quit_if, \quit_unless) |
| Date: | 2017-03-17 17:27:49 |
| Message-ID: | 15541.1489771669@sss.pgh.pa.us |
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| Lists: | pgsql-hackers |
Corey Huinker <corey(dot)huinker(at)gmail(dot)com> writes:
>> In the end, I suspect that teaching all the backslash commands to do
>> nothing after absorbing their arguments is likely to be the least messy
>> way to tackle this, even if it makes for a rather bulky patch.
> Perhaps, but just glancing at \connect makes me think that for some
> commands (present or future) the number of args might depend on the value
> of the first arg, and variable expansion-or-not, backtick execution-or-not
> could alter the number of apparent args on the line, like this:
> \set x 'arg1 arg2'
> \if false
> \cmd_that_takes_exactly_two_args :x
> \endif
Yeah, throwing errors for bad arguments would also need to be suppressed.
regards, tom lane
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