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Source for wiki DirectoryPortsCowan version 9
== Directory ports ==
This proposal depends on SettingsListsCowan. See DirectoriesCowan for a proposal for creating and destroying directories.
== Procedures ==
Returns a ''directory port''. It is not defined whether `port?` and `input-port?` return `#t` or `#f` to a directory port.
''Filename'' can be a string or a ''settings list'' as described in SettingsListsCowan. In addition to the keys `path` and `encoding` specified there, the key `hidden` can have the values `none` (don't expose hidden files), `all` (expose all files), and `dots` (expose 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. On other systems, the definition of a hidden file is implementation-dependent.
Returns `#t` if ''obj'' is a directory port.
Returns the next available filename as a string (or, when necessary, an implementation-dependent object). If no filenames are available, returns an eof-object. Filenames are returned in arbitrary order.
Close ''directory port''.