Michael Paquier <mich...@paquier.xyz> writes:
> On Tue, Apr 13, 2021 at 07:57:54AM +0000, PG Doc comments form wrote:
>> There is a spurious space inside the documentation:
>> \set HISTFILE ~/.psql_history- :DBNAME
>> instead of
>> \set HISTFILE ~/.psql_history-:DBNAME
> Both commands sey in your .psqlrc results in the same path being
> used, as I guess that psqlscanslash.l eats all the whitespaces
> in-between. So the documentation is not wrong here (see also commit
> e4c7619).
I think that e4c7619 may have been working around a since-fixed
limitation in variable expansion. [experiments ...] Ah, looks like
this behavior changed in 9.2, which is later than I would've guessed:
psql (9.1.24)
Type "help" for help.
regression=# \set FOO bar-:DBNAME
regression=# \echo :FOO
bar-:DBNAME
psql (9.2.24)
Type "help" for help.
regression=# \set FOO bar-:DBNAME
regression=# \echo :FOO
bar-regression
As you say, both ways now give the same result. Since it's not the
point of this example to illustrate \set's space-eating behavior,
it might be clearer to revert the addition of the space.
regards, tom lane
