[HACKERS] psql: Activate pager only for height, not width

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От Brendan Jurd
Тема [HACKERS] psql: Activate pager only for height, not width
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Msg-id CADxJZo1bDqDrXry5vwLtM5jfZKSw1i9o9DoWYFP+RCw8RuWAKA@mail.gmail.com
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Ответы Re: [HACKERS] psql: Activate pager only for height, not width
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Hello hackers,

I am often frustrated by the default behaviour of the psql pager, which will activate a pager if the output is deemed to be "too wide" for the terminal, regardless of the number of lines output, and of the pager_min_lines setting.

This behaviour is sometimes desirable, but in my use patterns it is more often the case that I want the pager to activate for output longer than terminal height, whereas for output a little wider than the terminal, I am happy for there to be some wrapping.  This is especially the case with "\d" output for tables, where, at 80 columns, very often the only wrapping is in the table borders and constraint/trigger definitions.

Usually I turn the pager off completely, and only switch it on when I am about to execute something that will return many rows, but what I'd really like is some way to tell psql to activate the pager as normal for height, but to ignore width.  My first thought was an alternate mode to \pset pager -- to {'on' | 'off' | 'always'} we could add 'height'.

Another option is to add the ability to specify the number of columns which psql considers "too wide", analogous to pager_min_lines.  I could then set pager_min_cols to something around 150 which would work nicely for my situation.

I don't have strong opinions about how the options are constructed, as long as it is possible to obtain the behaviour.

I would be happy to produce a patch, if this seems like an acceptable feature add.

Regards,
BJ

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