arrow

ARROW-16297: [R] Improve detection of ARROW_*_URL variables for offline build

As Neal mentioned in https://github.com/apache/arrow/pull/12849#issuecomment-1101489333, the current code in nixlibs.R doesn't handle URL variable names components that have multiple words (because of the way it parses variable names from filenames). Until now, we've had a special case for the AWS variables, but `ARROW_GOOGLE_CLOUD_CPP_URL` and `ARROW_NLOHMANN_JSON_URL` also need handling. Instead of adding special cases, we can provide the correct `ARROW_*_URL` values with the new bash script added as part of ARROW-15092 (in PR #12849).

Please let me know what you think!

Closes #12973 from karldw/fix-16297

Lead-authored-by: karldw <karldw@users.noreply.github.com>
Co-authored-by: Neal Richardson <neal.p.richardson@gmail.com>
Signed-off-by: Neal Richardson <neal.p.richardson@gmail.com>