μ-library to deal with non-empty strings, filenames, and directories.

The base types protect important invariants and are as follows:

• ContentfulString cannot be constructed from an empty string.
• Filename, e.g. just "foo". The filename is never an empty string.
• Basename, e.g. "foo.txt". The path extension is optional, but a valid filename is always present.
• Folder keeps a URL reference, but only to local directory URLs.
• FileURL only accepts local file: URLs, but rejects directories.

FileURL is the true star of the show: It combines Folder + Basename to represent local file URLs, so access to these never fails. Once you have a FileURL, you get checks for non-directory, local file: URLs for free. There's always going to be a basename for convenient access.

Construct file URLs from components, e.g. to create a destination URL for a new file in an existing folder:

guard let basename = Basename("foo.txt"),
      let folder = Folder(url: URL(fileURLWithPath: "/path/to/success/"))
else { exit }

let fileURL: FileURL = basename.fileURL(relativeTo: folder)

Filter URLs from user input for local filesystem references:

let url: URL = ...

guard let fileURL = FileURL(from: url) else { exit }

print("You selected", fileURL.basename, "in", fileURL.folder)

Construct file URLs from existing primitives by concatenation through custom operators:

// Custom operators!
let path: String = folder + basename
let fileURL: FileURL = folder + basename

.package(url: "https://github.com/CleanCocoa/PathUtils", from: "0.3.2")

MIT