Re: Add Pipelining support in psql

Jelte Fennema-Nio wrote:

> As an example you can copy paste this tiny script:
>
> \startpipeline
> select pg_sleep(5) \bind \g
> \endpipeline
>
> And then it will show these "extra argument ... ignored" warnings
>
> \startpipeline: extra argument "select" ignored
> \startpipeline: extra argument "pg_sleep(5)" ignored

It happens with other metacommands as well, and appears
to depend on a readline option that is "on" by default since
readline-8.1 [1]

enable-bracketed-paste

When set to ‘On’, Readline configures the terminal to insert each
paste into the editing buffer as a single string of characters,
instead of treating each character as if it had been read from the
keyboard. This is called putting the terminal into bracketed paste
mode; it prevents Readline from executing any editing commands
bound to key sequences appearing in the pasted text. The default
is ‘On’.

This behavior of the metacommand complaining about arguments
on the next line also happens if using \e and typing this sequence
of commands in the editor. In that case readline is not involved.

There might be something to improve here, because
a metacommand cannot take its argument from the next line,
and yet that's what the error messages somewhat imply.
But that issue is not related to the new pipeline metacommands.

[1]
https://tiswww.case.edu/php/chet/readline/readline.html#index-enable_002dbracketed_002dpaste

Best regards,
--
Daniel Vérité
https://postgresql.verite.pro/