Using R.cache.rootPath.ask or R_CACHE_ROOTPATH_ASK sys. env.

[arekbee]

With ver. 0.14.0, behavior of loaded library has change
In interactive mode (in RStudio) I will get a blocking message to create ~/.cache/R/R.cache/ path.
This is blocking our Shiny apps.
Maybe setting R option or system variable will not force to prompt the message.

If R.cache.rootPath.ask option or R_CACHE_ROOTPATH_ASK system variable will be false then prompt will not appear
R.cache.rootPath.ask has priority over R_CACHE_ROOTPATH_ASK

[codecov-io]

Codecov Report

Merging #43 (bdc3a2a) into develop (b4ea219) will not change coverage.
The diff coverage is 0.00%.

@@           Coverage Diff            @@
##           develop      #43   +/-   ##
========================================
  Coverage    67.65%   67.65%           
========================================
  Files           23       23           
  Lines          405      405           
========================================
  Hits           274      274           
  Misses         131      131           

Impacted Files	Coverage Δ
R/setupCacheRootPath.R	52.38% <0.00%> (ø)

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[lorenzwalthert]

I'd also like this feature. It came up in dreamRs/esquisse#168.

[HenrikBengtsson]

With ver. 0.14.0, behavior of loaded library has change
In interactive mode (in RStudio) I will get a blocking message to create ~/.cache/R/R.cache/ path.

This should have been fixed in R.cache 0.15.0 (2021-04-27). From the NEWS file:

R.cache/NEWS

Lines 17 to 18 in 2a543be

	* The package will no longer ask for permission to create the cache folder
	as long as the cache folder is compatible with tools::R_user_dir().

For non-standard cache folders, the CRAN policy is that we must have the user's permission to create folders. However, if the folder already exists, then R.cache does of course not have to ask for permission to create it, which is how R.cache always have worked.

Thus, the following should work without R.cache prompting the user:

> my_path <- file.path(tempdir(), "foo")
> dir.create(my_path, recursive = TRUE)

> options(R.cache.rootPath = my_path)
> path <- R.cache::getCachePath(dirs = "bar")
> path
[1] "/tmp/hb/RtmpdZuzuK/foo/bar"

Does this cover what you need?

[lorenzwalthert]

Perfect, thanks for the detailed explanation, this completely solves the problem. Will require R.cache >= 0.15.0 in {styler}.

[HenrikBengtsson]

This should have been fixed in R.cache 0.15.0 (2021-04-27).

I'll assume this fixed it, so I'll close. If not, please create an issue explaining the problem.