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

From: Corey Huinker <corey(dot)huinker(at)gmail(dot)com>
To: Greg Stark <stark(at)mit(dot)edu>
Cc: Fabien COELHO <coelho(at)cri(dot)ensmp(dot)fr>, Erik Rijkers <er(at)xs4all(dot)nl>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Robert Haas <robertmhaas(at)gmail(dot)com>, Daniel Verite <daniel(at)manitou-mail(dot)org>, 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: 2017-02-11 23:45:49
Message-ID: CADkLM=f4cDjWgq_JxMhf_NS0PG-xYuL5rhVpxth2zYxpu_fMhQ@mail.gmail.com
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On Sat, Feb 11, 2017 at 5:57 PM, Greg Stark <stark(at)mit(dot)edu> wrote:

> On 10 February 2017 at 21:36, Fabien COELHO <coelho(at)cri(dot)ensmp(dot)fr> wrote:
> >> command prompt is now
> >> ----------- ---------------------------------------
> >> \echo bob '' = initial state, no branch going on at all
> >> \if yes 't' = inside a true branch
> >> \if no 'tf' = false inside a true
> >> \endif 't' = back to just the true branch
> >> \if yes 'tt'
> >> \if yes 'ttt'
> >> \if yes '...ttt' = only show the last 3, but let it be known that
> >> there's at least one more'
> >> \else '...ttz' = past the point of a true bit of this branch
> >
> >
> > I like the "tfz" idea. I'm not sure whether the up to 6 characters is a
> > good, though.
>
>
> I haven't been following this thread but just skimming through it for
> the first time I thought this was more baroque than I was expecting. I
> was expecting something like a { for each level of nested if you're in
> so you can see how many deep you are. I didn't expect to see anything
> more complex than that.
>

So you'd just want to know nesting depth, with no indicator of true/false?

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