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| ANSI Common Lisp 19 Filenames 19.4 Dictionary of Filenames
19.4.11 namestring, file-namestring, directory-namestring, host-namestring, enough-namestring | Function
  Syntax: namestring pathname namestring file-namestring pathname namestring directory-namestring pathname namestring host-namestring pathname namestring enough-namestring pathname `&optional` defaults namestring Arguments and Values: pathname - a pathname designator. defaults - a pathname designator. The default is the value of *default-pathname-defaults*. namestring - a string or nil. Description: These functions convert pathname into a namestring. The name represented by pathname is returned as a namestring in an implementation-dependent canonical form. namestring returns the full form of pathname. file-namestring returns just the name, type, and version components of pathname. directory-namestring returns the directory name portion. host-namestring returns the host name. enough-namestring returns an abbreviated namestring that is just sufficient to identify the file named by pathname when considered relative to the defaults. It is required that
       (merge-pathnames (enough-namestring pathname defaults) defaults)
      ==(merge-pathnames (parse-namestring pathname nil defaults) defaults)
  in all cases, and the result of enough-namestring is the shortest reasonable string that will satisfy this criterion. It is not necessarily possible to construct a valid namestring by concatenating some of the three shorter namestrings in some order. Examples:
       (namestring "getty")
       "getty"
       (setq q (make-pathname :host "kathy"
                               :directory
                                 (pathname-directory *default-pathname-defaults*)
                               :name "getty"))
       #S(PATHNAME :HOST "kathy" :DEVICE NIL :DIRECTORY directory-name
             :NAME "getty" :TYPE NIL :VERSION NIL)
       (file-namestring q)  "getty"
       (directory-namestring q)  directory-name
       (host-namestring q)  "kathy"
       ;;;Using Unix syntax and the wildcard conventions used by the
       ;;;particular version of Unix on which this example was created:
       (namestring
         (translate-pathname "/usr/dmr/hacks/frob.l"
                             "/usr/d*/hacks/*.l"
                             "/usr/d*/backup/hacks/backup-*.*"))
       "/usr/dmr/backup/hacks/backup-frob.l"
       (namestring
         (translate-pathname "/usr/dmr/hacks/frob.l"
                             "/usr/d*/hacks/fr*.l"
                             "/usr/d*/backup/hacks/backup-*.*"))
       "/usr/dmr/backup/hacks/backup-ob.l"

       ;;;This is similar to the above example but uses two different hosts,
       ;;;U: which is a Unix and V: which is a VMS.  Note the translation
       ;;;of file type and alphabetic case conventions.
       (namestring
         (translate-pathname "U:/usr/dmr/hacks/frob.l"
                             "U:/usr/d*/hacks/*.l"
                             "V:SYS$DISK:[D*.BACKUP.HACKS]BACKUP-*.*"))
       "V:SYS$DISK:[DMR.BACKUP.HACKS]BACKUP-FROB.LSP"
       (namestring
         (translate-pathname "U:/usr/dmr/hacks/frob.l"
                             "U:/usr/d*/hacks/fr*.l"
                             "V:SYS$DISK:[D*.BACKUP.HACKS]BACKUP-*.*"))
       "V:SYS$DISK:[DMR.BACKUP.HACKS]BACKUP-OB.LSP"
See Also: truename, merge-pathnames, pathname, logical-pathname, Section 20.1 File System Concepts, Section 19.1.2 Pathnames as Filenames Allegro CL Implementation Details: See cl:namestring implementation for information on the Allegro CL implementation of namestring.

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