address knitr installation dependency

[simonpcouch]

Copies knitr::combine_words and friends to close #785.

Could you confirm this does the trick for you, @mdneuzerling?

[mdneuzerling]

Thank you so much for the quick response, @simonpcouch! My Docker image now builds successfully — without knitr — so I think we can consider #785 solved.

[simonpcouch]

Awesome, glad to hear it!

[simonpcouch]

Opted instead to introduce a light wrapper around glue::glue:collapse, which is already an Imports:

parsnip:::combine_words(1)
#> [1] "1"
parsnip:::combine_words(1:2)
#> [1] "1 and 2"
parsnip:::combine_words(1:3)
#> [1] "1, 2, and 3"
parsnip:::combine_words(1:4)
#> [1] "1, 2, 3, and 4"

^{Created on 2022-08-18 by the reprex package (v2.0.1)}

Will wait to fix merge conflicts until the updated NEWS.md is on main. :)

[github-actions]

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