package.file(...)
system.filesystem.file.
The function works as system.file,
but takes care when the package is a local folder.
The use case is when some data file or direcotry is needed to be loaded,
and it is placed in inst/ directory of the package.
mibddir <- package.file("extdata", "solarOutput", "solarMibds", package = "solarius") mibddir[1] "/home/andrey/git/ugcd/solarius/inst/extdata/solarOutput/solarMibds"list.files(mibddir)[1] "mibd.2.0.gz" "mibd.2.1.gz" "mibd.2.2.gz" "mibd.2.3.gz" "mibd.2.4.gz" [6] "mibd.2.5.gz" "mibd.5.0.gz" "mibd.5.1.gz" "mibd.5.2.gz" "mibd.5.3.gz" [11] "mibd.5.4.gz" "mibd.5.5.gz"