Lazy split

[kylemacomber]

Recently we've been exploring at FilePath APIs for Swift System, including extension:

let path: FilePath = "/tmp/archive.tar.gz"
print(path.stem!)
print(path.extension!)
// Prints "archive.tar"
// Prints "gz"

For more complicated cases, a lazy version of the existing split algorithm could be a handy and efficient (no heap allocations!) way to operate on a path with multiple extensions:

let path: FilePath = "/tmp/archive.tar.gz"
for component in path.basename!.string.lazy.split(separator: ".") {
    print(component)
}
// Prints "archive"
// Prints "tar"
// Prints "gz"