## Function: SB-EXT:MAP-DIRECTORY
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> Map over entries in DIRECTORY. Keyword arguments specify which entries to
> map over, and how:
> 
> :FILES
> If true, call FUNCTION with the pathname of each file in DIRECTORY.
> Defaults to T.
> 
> :DIRECTORIES
> If true, call FUNCTION with a pathname for each subdirectory of DIRECTORY.
> If :AS-FILES, the pathname used is a pathname designating the subdirectory
> as a file in DIRECTORY. Otherwise the pathname used is a directory
> pathname. Defaults to T.
> 
> :CLASSIFY-SYMLINKS
> If true, the decision to call FUNCTION with the pathname of a symbolic link
> depends on the resolution of the link: if it points to a directory, it is
> considered a directory entry, otherwise a file entry. If false, all
> symbolic links are considered file entries. In both cases the pathname used
> for the symbolic link is not fully resolved, but names it as an immediate
> child of DIRECTORY. Defaults to T.
> 
> :ERRORP
> If true, signal an error if DIRECTORY does not exist, cannot be read, etc.
> Defaults to T.
> 
> Experimental: interface subject to change.

### Lambda list
```cl
(function directory &key sb-impl::files sb-impl::directories sb-impl::classify-symlinks
 sb-impl::errorp)
```