Cache directory input not respected

[fangly]

Hi Jim,

I found a small issue in the lint() function, when specifying a cache directory. In the root directory of a package, consider:

setwd("tests/")
cacheDir <- file.path("..", ".lintr_cache")
lintr::expect_lint_free(cache=cacheDir)

This should create a directory ".lintr_cache", but it creates instead "~/.R/lintr_cache/".

After investigating, I found that in file "R/lint.R", function lint(), the line that reads:

save_cache(lint_cache, filename)

should be replaced by:

save_cache(lint_cache, filename, cache_dir)

Additionally, the documentation for the "cache" could be improved by stating that it is a directory (and not a simple file).

Cheers,
Florent

[fangly]

Fixed in #214