A Path is list of strings

Relative paths can go backwards.

First argument states how many layers to go back.

(0,[])
    |> relativeToString
    --> "."


(1,[])
    |> relativeToString
    --> "../."


(0,["a"])
    |> relativeToString
    --> "a"


(-1,["a"])
    |> relativeToString
    --> "a"


(1,["a"])
    |> relativeToString
    --> "../a"


(2,[])
    |> relativeToString
    --> "../../."


(0,["a", "b"])
    |> relativeToString
    --> "a.b"


(1,["a", "b"])
    |> relativeToString
    --> "../a.b"

list : List String
list =
    ["people","Jack"]


list
    |> toString
    --> relativeToString (0,list)

Turns relative path to path

[ "people", "jack"]
    |> withRelativePath (-1,[])
    --> Nothing


[ "people", "jack"]
    |> withRelativePath (0,[])
    --> Just ["people","jack"]


[ "people","jack"]
    |> withRelativePath (1,[ "gill"])
    --> Just ["people","gill"]


[ "people","jack" ]
    |> withRelativePath (2,[ "cities" ])
    --> Just [ "cities"]




[ "people","jack"]
    |> withRelativePath (3,[])
    --> Nothing