Julia - strange joinpath() behaviour

2
votes

This is supposed to prefix the given path:

date = Date(2016, 6, 3)
const FILEDATE_FORMAT = "YYYYmmdd"
const FILE_PATH_FORMAT = "/YYYY/mm/"

joinpath(
 "path-prefix",
  Dates.format(DateTime(date), FILE_PATH_FORMAT),
  Dates.format(DateTime(date), FILEDATE_FORMAT)
)

Expected: "/path-prefix/2016/06/20160603"

Actual: "/2016/06/20160603"

What is wrong here?

1
julia

1 Answers

5
votes

On Linux, / is the root directory. Since your FILE_PATH_FORMAT begins with the character /, joinpath is interpreting this as the root directory, and, as per the behaviour of that function, everything that comes before it is omitted since the path is already absolute.

The solution is to just drop the leading / from FILE_PATH_FORMAT.

By the way, I need to use yyyy, not YYYY on my system. Not sure why YYYY works for you...