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/


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