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Source for wiki DirectoryPortsCowan version 2
== Directory ports ==
This module depends on the acceptance of PortsCowan or something like it, as it uses the framework of that proposal.
== Procedures ==
Returns `#t` if ''filename'' is the name of a directory. ''Filename'' is a string or an implementation-dependent object.
''Filename'' can be a string or a ''settings list'' as described in PortsCowan. In addition to the keys `path` and `encoding` specified there, the key `hidden` can have the values `#f` (no hidden files), `#t` (all files), and `dots` (all files except `.` and `..`). On Posix systems, hidden files have names beginning with `.`; on Windows, hidden files are named `.`, `..`, or have the `hidden` file attribute.
The returned value is an input port, but it is neither a binary port nor a character port, so the only procedure callable on it is `read`, which returns the next available filename as a string (or, when necessary, an implementation-dependent object). Filenames are returned in arbitrary order. Directory ports are a disjoint type.
Returns `#t` if ''obj'' is a directory port.