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| ANSI Common Lisp 19 Filenames 19.4 Dictionary of Filenames
19.4.8 logical-pathname-translations | Accessor
  Syntax: logical-pathname-translations host translations (setf (logical-pathname-translations host) new-translations) Arguments and Values: host--a logical host designator. translations, new-translations - a list. Description: Returns the host's list of translations. Each translation is a list of at least two elements: from-wildcard and to-wildcard. Any additional elements are implementation-defined. From-wildcard is a logical pathname whose host is host. To-wildcard is a pathname. `(setf (logical-pathname-translations host) translations)` sets a logical pathname host's list of translations. If host is a string that has not been previously used as a logical pathname host, a new logical pathname host is defined; otherwise an existing host's translations are replaced. logical pathname host names are compared with string-equal. When setting the translations list, each from-wildcard can be a logical pathname whose host is host or a logical pathname namestring parseable by `(parse-namestring string host)`, where host represents the appropriate object as defined by parse-namestring. Each to-wildcard can be anything coercible to a pathname by `(pathname to-wildcard)`. If to-wildcard coerces to a logical pathname, translate-logical-pathname will perform repeated translation steps when it uses it. host is either the host component of a logical pathname or a string that has been defined as a logical pathname host name by setf of logical-pathname-translations. Examples:
       ;;;A very simple example of setting up a logical pathname host.  No
       ;;;translations are necessary to get around file system restrictions, so
       ;;;all that is necessary is to specify the root of the physical directory
       ;;;tree that contains the logical file system.
       ;;;The namestring syntax on the right-hand side is implementation-dependent.
       (setf (logical-pathname-translations "foo")
             '(("**;*.*.*"              "MY-LISPM:>library>foo>**>")))

       ;;;Sample use of that logical pathname.  The return value
       ;;;is implementation-dependent.
       (translate-logical-pathname "foo:bar;baz;mum.quux.3")
       #P"MY-LISPM:>library>foo>bar>baz>mum.quux.3"

       ;;;A more complex example, dividing the files among two file servers
       ;;;and several different directories.  This Unix doesn't support
       ;;;:WILD-INFERIORS in the directory, so each directory level must
       ;;;be translated individually.  No file name or type translations
       ;;;are required except for .MAIL to .MBX.
       ;;;The namestring syntax on the right-hand side is implementation-dependent.
       (setf (logical-pathname-translations "prog")
             '(("RELEASED;*.*.*"        "MY-UNIX:/sys/bin/my-prog/")
               ("RELEASED;*;*.*.*"      "MY-UNIX:/sys/bin/my-prog/*/")
               ("EXPERIMENTAL;*.*.*"    "MY-UNIX:/usr/Joe/development/prog/")
               ("EXPERIMENTAL;DOCUMENTATION;*.*.*"
                                        "MY-VAX:SYSDISK:[JOE.DOC]")
               ("EXPERIMENTAL;*;*.*.*"  "MY-UNIX:/usr/Joe/development/prog/*/")
               ("MAIL;**;*.MAIL"        "MY-VAX:SYSDISK:[JOE.MAIL.PROG...]*.MBX")))

       ;;;Sample use of that logical pathname.  The return value
       ;;;is implementation-dependent.
       (translate-logical-pathname "prog:mail;save;ideas.mail.3")
       #P"MY-VAX:SYS$DISK:[JOE.MAIL.PROG.SAVE]IDEAS.MBX.3"

       ;;;Example translations for a program that uses three files main.lisp,
       ;;;auxiliary.lisp, and documentation.lisp.  These translations might be
       ;;;supplied by a software supplier as examples.

       ;;;For Unix with long file names
       (setf (logical-pathname-translations "prog")
             '(("CODE;*.*.*"             "/lib/prog/")))

       ;;;Sample use of that logical pathname.  The return value
       ;;;is implementation-dependent.
       (translate-logical-pathname "prog:code;documentation.lisp")
       #P"/lib/prog/documentation.lisp"

       ;;;For Unix with 14-character file names, using .lisp as the type
       (setf (logical-pathname-translations "prog")
             '(("CODE;DOCUMENTATION.*.*" "/lib/prog/docum.*")
               ("CODE;*.*.*"             "/lib/prog/")))

       ;;;Sample use of that logical pathname.  The return value
       ;;;is implementation-dependent.
       (translate-logical-pathname "prog:code;documentation.lisp")
       #P"/lib/prog/docum.lisp"

       ;;;For Unix with 14-character file names, using .l as the type
       ;;;The second translation shortens the compiled file type to .b
       (setf (logical-pathname-translations "prog")
             `(("**;*.LISP.*"            ,(logical-pathname "PROG:**;*.L.*"))
               (,(compile-file-pathname (logical-pathname "PROG:**;*.LISP.*"))
                                         ,(logical-pathname "PROG:**;*.B.*"))
               ("CODE;DOCUMENTATION.*.*" "/lib/prog/documentatio.*")
               ("CODE;*.*.*"             "/lib/prog/")))

       ;;;Sample use of that logical pathname.  The return value
       ;;;is implementation-dependent.
       (translate-logical-pathname "prog:code;documentation.lisp")
       #P"/lib/prog/documentatio.l"

       ;;;For a Cray with 6 character names and no directories, types, or versions.
       (setf (logical-pathname-translations "prog")
             (let ((l '(("MAIN" "PGMN")
                        ("AUXILIARY" "PGAUX")
                        ("DOCUMENTATION" "PGDOC")))
                   (logpath (logical-pathname "prog:code;"))
                   (phypath (pathname "XXX")))
               (append
                 ;; Translations for source files
                 (mapcar #'(lambda (x)
                             (let ((log (first x))
                                   (phy (second x)))
                               (list (make-pathname :name log
                                                    :type "LISP"
                                                    :version :wild
                                                    :defaults logpath)
                                     (make-pathname :name phy
                                                    :defaults phypath))))
                         l)
                 ;; Translations for compiled files
                 (mapcar #'(lambda (x)
                             (let* ((log (first x))
                                    (phy (second x))
                                    (com (compile-file-pathname
                                           (make-pathname :name log
                                                          :type "LISP"
                                                          :version :wild
                                                          :defaults logpath))))
                               (setq phy (concatenate 'string phy "B"))
                               (list com
                                     (make-pathname :name phy
                                                    :defaults phypath))))
                         l))))

       ;;;Sample use of that logical pathname.  The return value
       ;;;is implementation-dependent.
       (translate-logical-pathname "prog:code;documentation.lisp")
       #P"PGDOC"
Exceptional Situations: If host is incorrectly supplied, an error of type type-error is signaled. See Also: logical-pathname, Section 19.1.2 Pathnames as Filenames Notes: Implementations can define additional functions that operate on logical pathname hosts, for example to specify additional translation rules or options. Allegro CL Implementation Details: None.

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