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

Corey Huinker <corey.huinker@gmail.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