I second that - it provides the most consistent way of storing information 

I was in a similar situation, and ended up using the function at 


And the location `rappdirs::user_config_dir(appname = "dmdScheme", appauthor = 
"dmdScheme”)` as the permanent cache.

I either either 
- use a temporary cache if the cache does not exist
- if the cache does exist, use that one, and
- use the `createPermanent` argument to create the cache so that it can be used.



> On 14 Jan 2020, at 17:34, Gábor Csárdi <csardi.ga...@gmail.com> wrote:
> You can use the rappdirs package to look up the standard places for
> permanent config, cache etc. files. E.g. on macOS:
> ❯ rappdirs::user_cache_dir()
> [1] "/Users/gaborcsardi/Library/Caches"
> Gabor
> On Tue, Jan 14, 2020 at 4:10 PM Jonathan Greenberg <jgreenb...@unr.edu> wrote:
>> Folks:
>> My package gdalUtils is a wrapper for a set of binaries on disk (the GDAL 
>> Utilities) -- these have about as many places to install as there are people 
>> installing it, and the system environment variables aren't always much help 
>> (they aren't always set) for locating them.  My package is trying to 
>> dummy-proof the usage as much as possible, so one of the things it does is 
>> if it can't find the install, it goes search for the install in, first, 
>> standard locations and runs a short test to see if the install is valid and, 
>> if not, goes on a longer hunt.  Right now, it does this search everytime 
>> someone boots up R and uses it, which slows down the process.
>> What I'm wondering is twofold:
>> 1) Are there any packages/methods by which user "preferences" are saved that 
>> don't require saving workspaces (e.g. does R have a standardized 
>> "preferences" location that packages can use).
>> 2) If the answer to #1 is "no", what is the preferred method for saving 
>> variables for use by packages that are always restored on boot -- e.g. I was 
>> thinking something like .Renviron but I think that's Rstudio only.  I'm 
>> concerned with workspace-type saves since I feel like that often results in 
>> a ton of variables being saved.
>> Thanks!
>> --j
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Rainer M. Krug, PhD (Conservation Ecology, SUN), MSc (Conservation Biology, 
UCT), Dipl. Phys. (Germany)

Orcid ID: 0000-0002-7490-0066

Department of Evolutionary Biology and Environmental Studies
University of Zürich
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