defmodule FilePaths do
  def main do
    # Path.join/1 should be used to construct paths in a
    # portable way. It takes a list of path segments
    # and constructs a hierarchical path from them.
    p = Path.join(["dir1", "dir2", "filename"])
    IO.puts("p: #{p}")

    # You should always use Path.join/1 instead of
    # concatenating "/" manually. In addition to providing
    # portability, Path.join/1 will also normalize paths
    # by removing superfluous separators and directory changes.
    IO.puts(Path.join(["dir1//", "filename"]))
    IO.puts(Path.join(["dir1/../dir1", "filename"]))

    # Path.dirname/1 and Path.basename/1 can be used to split
    # a path to the directory and the file.
    IO.puts("Dir(p): #{Path.dirname(p)}")
    IO.puts("Base(p): #{Path.basename(p)}")

    # We can check whether a path is absolute.
    IO.puts(Path.type("dir/file"))
    IO.puts(Path.type("/dir/file"))

    filename = "config.json"

    # Some file names have extensions following a dot. We
    # can split the extension out of such names with Path.extname/1.
    ext = Path.extname(filename)
    IO.puts(ext)

    # To find the file's name with the extension removed,
    # use Path.rootname/1.
    IO.puts(Path.rootname(filename))

    # Path.relative_to/2 finds a relative path between a base and a
    # target. It returns the target if it cannot be made relative to base.
    rel = Path.relative_to("a/b/t/file", "a/b")
    IO.puts(rel)

    rel = Path.relative_to("a/c/t/file", "a/b")
    IO.puts(rel)
  end
end

FilePaths.main()