Cols hide missing

[mrcaseb]

Summary

This PR introduces the exported function cols_hide_missing(). It checks if columns in the table data are missing all rows, i.e. all values equal NA, and hides them using cols_hide().

It is obviously possible to omit such columns before entering gt but the "all-NA" columns could still be useful during formatting of other columns.

I keep the PR a draft as the cols_hide documentation needs to be updated for cols_hide_missing. I didn't do this yet because I wanted to discuss the general interest in this function first.

Checklist

• I understand and agree to the Code of Conduct.
• I have listed any major changes in the NEWS.
• I have added testthat unit tests to tests/testthat for any new functionality.

[CLAassistant]

All committers have signed the CLA.

[rich-iannone]

Thanks for the contribution but after thinking about this for some time, it's possible to create an equivalent tidyselect expression and supply it to cols_hide() for the same effect.

[mrcaseb]

Thanks for the contribution but after thinking about this for some time, it's possible to create an equivalent tidyselect expression and supply it to cols_hide() for the same effect.

Oooh. I never thought about that! Do you suggest something like this?

tidyselect::where(~ all(is.na(.x)))

[rich-iannone]

Yeah, that would do it! Again sorry to close but it’s in the interest of limiting new functions (as we are super high in exported function count now).

[mrcaseb]

Yeah, that would do it! Again sorry to close but it’s in the interest of limiting new functions (as we are super high in exported function count now).

Oh no worries. I prefer limiting exported functions as well and appreciate the tidyselect suggestion as well as your work.