dpans/dict-pathnames.tex

% -*- Mode: TeX -*-

% Pathnames
%  Logical Pathnames
%  Parsing
%   Namestrings
%   Pathname Matching
%   Pathname Merging

%-------------------- Pathname Types --------------------

\begincom{pathname}\ftype{System Class}

\label Class Precedence List::
\typeref{pathname},
\typeref{t}

\label Description::

A \term{pathname} is a structured \term{object} which represents a \term{filename}.

There are two kinds of \term{pathnames}---\term{physical pathnames} and
\term{logical pathnames}.

\endcom%{pathname}\ftype{System Class}
\begincom{logical-pathname}\ftype{System Class}

\issue{TYPE-OF-AND-PREDEFINED-CLASSES:UNIFY-AND-EXTEND}

\label Class Precedence List::

\typeref{logical-pathname},
\typeref{pathname},
\typeref{t}

\label Description::

A \term{pathname} that uses a \term{namestring} syntax that is 
\term{implementation-independent}, 
and that has component values that are \term{implementation-independent}.
\term{Logical pathnames} do not refer directly to \term{filenames}

%!!! Barmar: Needs more description.  e.g.,
%      an implementation-independent pathname that is automatically translated
%      to a pathname when it is used.
%
% Relate to physical pathname.

\label See Also::

{\secref\FileSystemConcepts},
{\secref\SharpsignP},
{\secref\PrintingPathnames}

\endissue{TYPE-OF-AND-PREDEFINED-CLASSES:UNIFY-AND-EXTEND}

\endcom%{logical-pathname}\ftype{System Class}

%-------------------- Pathnames --------------------

%%% ========== PATHNAME
\begincom{pathname}\ftype{Function}

\label Syntax:: 

\DefunWithValues pathname {pathspec} {pathname}

\label Arguments and Values::

\issue{PATHNAME-STREAM}
\param{pathspec}---a \term{pathname designator}.
\endissue{PATHNAME-STREAM}

\param{pathname}---a \term{pathname}.

\label Description::

Returns the \term{pathname} denoted by \param{pathspec}.

%% 23.1.2 5
% \funref{pathname} converts \param{pathspec} to a \term{pathname} 
% and returns the new \term{pathname}.
% If \param{pathspec} is a \term{stream} 
% it represents the name used to open the file. This may be, but is
% not required to be, the actual name of the file. 
\issue{CLOSED-STREAM-FUNCTIONS:ALLOW-INQUIRY}
If the \param{pathspec} \term{designator} is a \term{stream},
the \term{stream} can be either open or closed;
in both cases, the \funref{pathname} returned 
corresponds to the \term{filename} used to open the \term{file}.
\funref{pathname} returns the same \term{pathname} for a \term{file stream}
after it is closed as it did when it was open.
\endissue{CLOSED-STREAM-FUNCTIONS:ALLOW-INQUIRY}

\issue{PATHNAME-LOGICAL:ADD}
% created by \funref{open}
% or \macref{with-open-file} of a \term{logical pathname},
%\funref{pathname} returns a \term{logical pathname}.
If the \param{pathspec} \term{designator} is
a \term{file stream} created by opening a \term{logical pathname},
a \term{logical pathname} is returned.
\endissue{PATHNAME-LOGICAL:ADD}
% \issue{PATHNAME-STREAM}
% It is an error if \param{pathspec} is a \term{stream} that is 
% created with \funref{make-two-way-stream}, 
% \funref{make-echo-stream},
% \funref{make-broadcast-stream}, 
% \funref{make-concatenated-stream}, \funref{make-string-input-stream},
% \funref{make-string-output-stream}.
% \endissue{PATHNAME-STREAM}

\label Examples::

\code
 ;; There is a great degree of variability permitted here.  The next
 ;; several examples are intended to illustrate just a few of the many
 ;; possibilities.  Whether the name is canonicalized to a particular
 ;; case (either upper or lower) depends on both the file system and the
 ;; implementation since two different implementations using the same
 ;; file system might differ on many issues.  How information is stored
 ;; internally (and possibly presented in #S notation) might vary,
 ;; possibly requiring `accessors' such as PATHNAME-NAME to perform case
 ;; conversion upon access.  The format of a namestring is dependent both
 ;; on the file system and the implementation since, for example, one
 ;; implementation might include the host name in a namestring, and
 ;; another might not.  #S notation would generally only be used in a
 ;; situation where no appropriate namestring could be constructed for use
 ;; with #P.
 (setq p1 (pathname "test"))
\EV #P"CHOCOLATE:TEST" ; with case canonicalization (e.g., VMS)
\OV #P"VANILLA:test"   ; without case canonicalization (e.g., Unix)
\OV #P"test"
\OV #S(PATHNAME :HOST "STRAWBERRY" :NAME "TEST")
\OV #S(PATHNAME :HOST "BELGIAN-CHOCOLATE" :NAME "test")
 (setq p2 (pathname "test"))
\EV #P"CHOCOLATE:TEST"
\OV #P"VANILLA:test"
\OV #P"test"
\OV #S(PATHNAME :HOST "STRAWBERRY" :NAME "TEST")
\OV #S(PATHNAME :HOST "BELGIAN-CHOCOLATE" :NAME "test")
 (pathnamep p1) \EV \term{true}
 (eq p1 (pathname p1)) \EV \term{true}
 (eq p1 p2)
\EV \term{true}
\OV \term{false}
 (with-open-file (stream "test" :direction :output)
   (pathname stream))
\EV #P"ORANGE-CHOCOLATE:>Gus>test.lisp.newest"
\endcode

\label Affected By:\None.

\label Exceptional Situations:\None.

\label See Also::

\issue{PATHNAME-LOGICAL:ADD}
\typeref{pathname},
\typeref{logical-pathname},
{\secref\FileSystemConcepts},
\endissue{PATHNAME-LOGICAL:ADD}
\issue{FILE-OPEN-ERROR:SIGNAL-FILE-ERROR}
{\secref\PathnamesAsFilenames}
\endissue{FILE-OPEN-ERROR:SIGNAL-FILE-ERROR}

\label Notes:\None.

%% 23.1.2 4                 
%% was left out

\endcom%{pathname}


%%% ========== MAKE-PATHNAME
\begincom{make-pathname}\ftype{Function}

\label Syntax:: 

\DefunWithValuesNewline make-pathname 
		        {{\key} host device directory name type version defaults case}
		        {pathname}

\label Arguments and Values::

\issue{PATHNAME-UNSPECIFIC-COMPONENT:NEW-TOKEN}
\param{host}---a \term{valid physical pathname host}.
%%Per X3J13. -kmp 05-Oct-93.
 \HairyDefault.

\param{device}---a \term{valid pathname device}.
%%Per X3J13. -kmp 05-Oct-93.
 \HairyDefault.

\param{directory}---a \term{valid pathname directory}.
%%Per X3J13. -kmp 05-Oct-93.
 \HairyDefault.

\param{name}---a \term{valid pathname name}.
%%Per X3J13. -kmp 05-Oct-93.
 \HairyDefault.

\param{type}---a \term{valid pathname type}.
%%Per X3J13. -kmp 05-Oct-93.
 \HairyDefault.

\param{version}---a \term{valid pathname version}.
%%Per X3J13. -kmp 05-Oct-93
 \HairyDefault.
\endissue{PATHNAME-UNSPECIFIC-COMPONENT:NEW-TOKEN}

\param{defaults}---a \term{pathname designator}.
 \Default{a \term{pathname} whose host component is the same as the
          host component of \thevalueof{*default-pathname-defaults*},
	  and whose other components are all \nil}

\issue{PATHNAME-COMPONENT-CASE:KEYWORD-ARGUMENT}
\param{case}---one of \kwd{common} or \kwd{local}.
 \Default{\kwd{local}}
\endissue{PATHNAME-COMPONENT-CASE:KEYWORD-ARGUMENT}

\param{pathname}---a \term{pathname}.

\label Description::

%% 23.1.2 27
Constructs and returns a \term{pathname} from the supplied keyword arguments.

After the components supplied explicitly by
       \param{host},
       \param{device}, 
       \param{directory},
       \param{name},
       \param{type},
   and \param{version} 
are filled in, 
the merging rules used by \funref{merge-pathnames} 
are used to fill in any 
%%Per X3J13. -kmp 05-Oct-93.
%missing
unsupplied
components
from the defaults supplied by \param{defaults}.

%% 23.1.2 28
Whenever a \term{pathname} is constructed the components may be 
canonicalized if appropriate.
%For example, if a file system is insensitive to case, then
%characters with case may be forced to be all uppercase or all lowercase
%by the implementation.
For the explanation of the arguments that can be supplied for each component,
\seesection\PathnameComponents.

\issue{PATHNAME-COMPONENT-CASE:KEYWORD-ARGUMENT}
If \param{case} is supplied,
it is treated as described in \secref\PathnameComponentCase.
\endissue{PATHNAME-COMPONENT-CASE:KEYWORD-ARGUMENT}

\issue{PATHNAME-HOST-PARSING:RECOGNIZE-LOGICAL-HOST-NAMES}
\issue{PATHNAME-LOGICAL:ADD}
The resulting \param{pathname} is a \term{logical pathname} 
if and only its host component 
%denotes 
is
a \term{logical host} 
or a \term{string} that names a defined \term{logical host}.
% If \param{host} is supplied,
% the host is logical if it came from \funref{pathname-host} of a \term{logical pathname}. 
% Whether \param{host} denotes a \term{logical host} if it is a \term{string} 
% that is equal to the \term{name} of a \term{logical host} is \term{implementation-defined}.
\endissue{PATHNAME-LOGICAL:ADD}
\endissue{PATHNAME-HOST-PARSING:RECOGNIZE-LOGICAL-HOST-NAMES}

\issue{PATHNAME-SUBDIRECTORY-LIST:NEW-REPRESENTATION}
%!!! Laddaga: Clearly this should also be presented in the concept section.
If the \param{directory} is a \term{string},
it should be the name of a top level directory,
and should not contain any punctuation characters; that is,
specifying a \term{string}, \i{str}, is
equivalent to specifying the list \f{(:absolute \i{str})}.
Specifying the symbol \kwd{wild} is equivalent to specifying the list 
\f{(:absolute :wild-inferiors)}, or \f{(:absolute :wild)} 
in a file system that does not support \kwd{wild-inferiors}.
\endissue{PATHNAME-SUBDIRECTORY-LIST:NEW-REPRESENTATION}
 
\label Examples::

\code
 ;; Implementation A -- an implementation with access to a single
 ;;  Unix file system.  This implementation happens to never display
 ;;  the `host' information in a namestring, since there is only one host. 
 (make-pathname :directory '(:absolute "public" "games")
                :name "chess" :type "db")
\EV #P"/public/games/chess.db" 
\medbreak
 ;; Implementation B -- an implementation with access to one or more
 ;;  VMS file systems.  This implementation displays `host' information
 ;;  in the namestring only when the host is not the local host.
 ;;  It uses a double colon to separate a host name from the host's local
 ;;  file name.
 (make-pathname :directory '(:absolute "PUBLIC" "GAMES")
                :name "CHESS" :type "DB")
\EV #P"SYS$DISK:[PUBLIC.GAMES]CHESS.DB" 
 (make-pathname :host "BOBBY"
                :directory '(:absolute "PUBLIC" "GAMES")
                :name "CHESS" :type "DB")
\EV #P"BOBBY::SYS$DISK:[PUBLIC.GAMES]CHESS.DB" 
\medbreak
 ;; Implementation C -- an implementation with simultaneous access to
 ;;  multiple file systems from the same Lisp image.  In this 
 ;;  implementation, there is a convention that any text preceding the
 ;;  first colon in a pathname namestring is a host name.
 (dolist (case '(:common :local))
   (dolist (host '("MY-LISPM" "MY-VAX" "MY-UNIX"))
     (print (make-pathname :host host :case case
                           :directory '(:absolute "PUBLIC" "GAMES")
                           :name "CHESS" :type "DB"))))
\OUT #P"MY-LISPM:>public>games>chess.db"
\OUT #P"MY-VAX:SYS$DISK:[PUBLIC.GAMES]CHESS.DB"
\OUT #P"MY-UNIX:/public/games/chess.db"
\OUT #P"MY-LISPM:>public>games>chess.db" 
\OUT #P"MY-VAX:SYS$DISK:[PUBLIC.GAMES]CHESS.DB" 
\OUT #P"MY-UNIX:/PUBLIC/GAMES/CHESS.DB" 
\EV NIL
\endcode

\label Affected By::

The \term{file system}.

\label Exceptional Situations:\None.

\label See Also::

\issue{PATHNAME-LOGICAL:ADD}
\funref{merge-pathnames},
\typeref{pathname},
\typeref{logical-pathname},
{\secref\FileSystemConcepts},
\endissue{PATHNAME-LOGICAL:ADD}
\issue{FILE-OPEN-ERROR:SIGNAL-FILE-ERROR}
{\secref\PathnamesAsFilenames}
\endissue{FILE-OPEN-ERROR:SIGNAL-FILE-ERROR}

\label Notes::

Portable programs should not supply \kwd{unspecific} for any component.
\Seesection\UnspecificComponent.

\endcom%{make-pathname}

%%% ========== PATHNAMEP
\begincom{pathnamep}\ftype{Function}

\label Syntax::

\DefunWithValues pathnamep {object} {generalized-boolean}

\label Arguments and Values::

\param{object}---an \term{object}.

\param{generalized-boolean}---a \term{generalized boolean}.

\label Description::

%% 23.1.2 29
\TypePredicate{object}{pathname}

\label Examples::

\code
 (setq q "test")  \EV "test"
 (pathnamep q) \EV \term{false}
 (setq q (pathname "test"))
\EV #S(PATHNAME :HOST NIL :DEVICE NIL :DIRECTORY NIL :NAME "test" :TYPE NIL
       :VERSION NIL)
 (pathnamep q) \EV \term{true} 
 (setq q (logical-pathname "SYS:SITE;FOO.SYSTEM"))
\EV #P"SYS:SITE;FOO.SYSTEM"
 (pathnamep q) \EV \term{true}
\endcode

\label Side Effects:\None.

\label Affected By:\None.

\label Exceptional Situations:\None!

\label See Also:\None.

\label Notes::

\code
 (pathnamep \param{object}) \EQ (typep \param{object} 'pathname)
\endcode

\endcom%{pathnamep}

%%% ========== PATHNAME-HOST
%%% ========== PATHNAME-DEVICE
%%% ========== PATHNAME-DIRECTORY
%%% ========== PATHNAME-NAME
%%% ========== PATHNAME-TYPE
%%% ========== PATHNAME-VERSION
\begincom{pathname-host, pathname-device, pathname-directory,
	  pathname-name, pathname-type,   pathname-version}\ftype{Function}

\label Syntax::

\issue{PATHNAME-COMPONENT-CASE:KEYWORD-ARGUMENT}

\DefunWithValues pathname-host      {pathname {\key} case} {host}

\DefunWithValues pathname-device    {pathname {\key} case} {device}

\DefunWithValues pathname-directory {pathname {\key} case} {directory}

\DefunWithValues pathname-name      {pathname {\key} case} {name}

\DefunWithValues pathname-type      {pathname {\key} case} {type}

\endissue{PATHNAME-COMPONENT-CASE:KEYWORD-ARGUMENT}

\DefunWithValues pathname-version {pathname} {version}

\label Arguments and Values::

\issue{PATHNAME-STREAM}
\param{pathname}---a \term{pathname designator}.
\endissue{PATHNAME-STREAM}

\issue{PATHNAME-COMPONENT-CASE:KEYWORD-ARGUMENT}
\param{case}---one of \kwd{local} or \kwd{common}.
 \Default{\kwd{local}}
\endissue{PATHNAME-COMPONENT-CASE:KEYWORD-ARGUMENT}

\issue{PATHNAME-UNSPECIFIC-COMPONENT:NEW-TOKEN}
\param{host}---a \term{valid pathname host}.

\param{device}---a \term{valid pathname device}.

\issue{PATHNAME-SUBDIRECTORY-LIST:NEW-REPRESENTATION}
\param{directory}---a \term{valid pathname directory}.
\endissue{PATHNAME-SUBDIRECTORY-LIST:NEW-REPRESENTATION}

\param{name}---a \term{valid pathname name}.

\param{type}---a \term{valid pathname type}.

\param{version}---a \term{valid pathname version}.

\endissue{PATHNAME-UNSPECIFIC-COMPONENT:NEW-TOKEN}

\label Description::

%% 23.1.2 30
These functions return the components of \param{pathname}.

If the \param{pathname} \term{designator} is a \term{pathname},
it represents the name used to open the file. This may be, but is
not required to be, the actual name of the file. 

\issue{PATHNAME-COMPONENT-CASE:KEYWORD-ARGUMENT}
If \param{case} is supplied,
it is treated as described in \secref\PathnameComponentCase.
\endissue{PATHNAME-COMPONENT-CASE:KEYWORD-ARGUMENT}

\label Examples::

\issue{PATHNAME-WILD:NEW-FUNCTIONS}
\issue{PATHNAME-SUBDIRECTORY-LIST:NEW-REPRESENTATION}
\code
 (setq q (make-pathname :host "KATHY"
                        :directory "CHAPMAN" 
                        :name "LOGIN" :type "COM"))
\EV #P"KATHY::[CHAPMAN]LOGIN.COM"
 (pathname-host q) \EV "KATHY"
 (pathname-name q) \EV "LOGIN"
 (pathname-type q) \EV "COM"

 ;; Because namestrings are used, the results shown in the remaining
 ;; examples are not necessarily the only possible results.  Mappings
 ;; from namestring representation to pathname representation are 
 ;; dependent both on the file system involved and on the implementation
 ;; (since there may be several implementations which can manipulate the
 ;; the same file system, and those implementations are not constrained
 ;; to agree on all details). Consult the documentation for each
 ;; implementation for specific information on how namestrings are treated
 ;; that implementation.

 ;; VMS
 (pathname-directory (parse-namestring "[FOO.*.BAR]BAZ.LSP"))
\EV (:ABSOLUTE "FOO" "BAR")
 (pathname-directory (parse-namestring "[FOO.*.BAR]BAZ.LSP") :case :common)
\EV (:ABSOLUTE "FOO" "BAR")

 ;; Unix
 (pathname-directory "foo.l") \EV NIL
 (pathname-device "foo.l") \EV :UNSPECIFIC
 (pathname-name "foo.l") \EV "foo"
 (pathname-name "foo.l" :case :local) \EV "foo"
 (pathname-name "foo.l" :case :common) \EV "FOO"
 (pathname-type "foo.l") \EV "l"
 (pathname-type "foo.l" :case :local) \EV "l"
 (pathname-type "foo.l" :case :common) \EV "L"
 (pathname-type "foo") \EV :UNSPECIFIC
 (pathname-type "foo" :case :common) \EV :UNSPECIFIC
 (pathname-type "foo.") \EV ""
 (pathname-type "foo." :case :common) \EV ""
 (pathname-directory (parse-namestring "/foo/bar/baz.lisp") :case :local)
\EV (:ABSOLUTE "foo" "bar")
 (pathname-directory (parse-namestring "/foo/bar/baz.lisp") :case :local)
\EV (:ABSOLUTE "FOO" "BAR")
 (pathname-directory (parse-namestring "../baz.lisp"))
\EV (:RELATIVE :UP)
 (PATHNAME-DIRECTORY (PARSE-NAMESTRING "/foo/BAR/../Mum/baz"))
\EV (:ABSOLUTE "foo" "BAR" :UP "Mum")
 (PATHNAME-DIRECTORY (PARSE-NAMESTRING "/foo/BAR/../Mum/baz") :case :common)
\EV (:ABSOLUTE "FOO" "bar" :UP "Mum")
 (PATHNAME-DIRECTORY (PARSE-NAMESTRING "/foo/*/bar/baz.l"))
\EV (:ABSOLUTE "foo" :WILD "bar")
 (PATHNAME-DIRECTORY (PARSE-NAMESTRING "/foo/*/bar/baz.l") :case :common)
\EV (:ABSOLUTE "FOO" :WILD "BAR")

 ;; Symbolics LMFS
 (pathname-directory (parse-namestring ">foo>**>bar>baz.lisp"))
\EV (:ABSOLUTE "foo" :WILD-INFERIORS "bar")
 (pathname-directory (parse-namestring ">foo>*>bar>baz.lisp"))
\EV (:ABSOLUTE "foo" :WILD "bar")
 (pathname-directory (parse-namestring ">foo>*>bar>baz.lisp") :case :common)
\EV (:ABSOLUTE "FOO" :WILD "BAR")
 (pathname-device (parse-namestring ">foo>baz.lisp")) \EV :UNSPECIFIC
\endcode
\endissue{PATHNAME-SUBDIRECTORY-LIST:NEW-REPRESENTATION}
\endissue{PATHNAME-WILD:NEW-FUNCTIONS}


\label Affected By::

The \term{implementation} and the host \term{file system}.

\label Exceptional Situations::

Should signal an error \oftype{type-error} if its first argument is not a \term{pathname}.

\label See Also::

\issue{PATHNAME-LOGICAL:ADD}
\typeref{pathname},
\typeref{logical-pathname},
{\secref\FileSystemConcepts},
\endissue{PATHNAME-LOGICAL:ADD}
\issue{FILE-OPEN-ERROR:SIGNAL-FILE-ERROR}
{\secref\PathnamesAsFilenames}
\endissue{FILE-OPEN-ERROR:SIGNAL-FILE-ERROR}

\label Notes:\None.

\endcom%{pathname-host, ...}

%-------------------- Logical Pathnames --------------------

%%% ========== LOAD-LOGICAL-PATHNAME-TRANSLATIONS
\begincom{load-logical-pathname-translations}\ftype{Function}

\issue{PATHNAME-LOGICAL:ADD}

\label Syntax:: 

\DefunWithValues load-logical-pathname-translations {host} {just-loaded}

\label Arguments and Values::

\param{host}---a \term{string}.

\term{just-loaded}---a \term{generalized boolean}.

\label Description::

Searches for and loads the definition of a \term{logical host} named \param{host},
if it is not already defined.
The specific nature of the search is \term{implementation-defined}.
 
If the \param{host} is already defined, 
no attempt to find or load a definition is attempted,
and \term{false} is returned.
If the \param{host} is not already defined,
but a definition is successfully found and loaded,
\term{true} is returned.
Otherwise, an error is signaled.

\label Examples::

\code
 (translate-logical-pathname "hacks:weather;barometer.lisp.newest")
\OUT Error: The logical host HACKS is not defined.
 (load-logical-pathname-translations "HACKS")
\OUT ;; Loading SYS:SITE;HACKS.TRANSLATIONS
\OUT ;; Loading done.
\EV \term{true}
 (translate-logical-pathname "hacks:weather;barometer.lisp.newest")
\EV #P"HELIUM:[SHARED.HACKS.WEATHER]BAROMETER.LSP;0"
 (load-logical-pathname-translations "HACKS")
\EV \term{false}
\endcode

\label Affected By:\None.

\label Exceptional Situations::

If no definition is found, an error \oftype{error} is signaled.

\label See Also::

\typeref{logical-pathname}

\label Notes::

\term{Logical pathname} definitions will be created not just by 
\term{implementors} but also by \term{programmers}.  As such,
it is important that the search strategy be documented.
For example, an \term{implementation} might define that the
definition of a \param{host} is to be found in a file called
``\param{host}.translations'' in some specifically named directory.
 
\endissue{PATHNAME-LOGICAL:ADD}

\endcom%{load-logical-pathname-translations}

%%% ========== LOGICAL-PATHNAME-TRANSLATIONS
\begincom{logical-pathname-translations}\ftype{Accessor}

\issue{PATHNAME-LOGICAL:ADD}

\label Syntax:: 

\DefunWithValues logical-pathname-translations {host} {translations}
\Defsetf         logical-pathname-translations {host} {new-translations}

\label Arguments and Values::

\param{host}--a \term{logical host designator}.

\param{translations}, \param{new-translations}---a \term{list}.

\label Description::

Returns the host's \term{list} of translations.
Each translation is a \term{list} of at least two elements: 
\i{from-wildcard} and \i{to-wildcard}.  Any
    additional elements are \term{implementation-defined}.  
\i{From-wildcard} is a
    \term{logical pathname} whose host is \param{host}.  
\i{To-wildcard} is a \term{pathname}.    
\reviewer{Laddaga: Can this be a logical pathname?}
                                                    
\f{(setf (logical-pathname-translations \param{host}) \i{translations})} sets a 
\term{logical pathname} host's
\term{list} of \i{translations}.  If \param{host} 
is a \term{string} that has
    not been previously used as 
a \term{logical pathname} host, a new 
\term{logical pathname} host is defined; 
otherwise an existing host's translations are
    replaced.  \term{logical pathname} host names are compared with \funref{string-equal}.
 
    When setting the translations list, each \i{from-wildcard} 
can be a \term{logical pathname} whose
host is \param{host} or a \term{logical pathname} namestring
    parseable by \f{(parse-namestring \term{string} \i{host})}, 
where \i{host}
    represents the appropriate \term{object} as defined 
by \funref{parse-namestring}. Each
    \i{to-wildcard} can be anything coercible to a 
\term{pathname} by
    \f{(pathname \i{to-wildcard})}.  
If \i{to-wildcard} coerces to a \term{logical pathname},
\funref{translate-logical-pathname} 
will perform repeated translation steps when
    it uses it.
 
\param{host} is either the host component of a 
\term{logical pathname} or a
    \term{string} that has been defined 
as a \term{logical pathname} host name by \macref{setf} of
\funref{logical-pathname-translations}. 

\label Examples::

\reviewer{Laddaga: Shouldn't there be some \f{*.*}'s in the list
		   of translations for \f{PROG} below?}

\code
 ;;;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>**>")))
\smallbreak 
 ;;;Sample use of that logical pathname.  The return value
 ;;;is implementation-dependent.          
 (translate-logical-pathname "foo:bar;baz;mum.quux.3")
\EV #P"MY-LISPM:>library>foo>bar>baz>mum.quux.3"
\medbreak 
 ;;;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:SYS$DISK:[JOE.DOC]")
         ("EXPERIMENTAL;*;*.*.*"  "MY-UNIX:/usr/Joe/development/prog/*/")
         ("MAIL;**;*.MAIL"        "MY-VAX:SYS$DISK:[JOE.MAIL.PROG...]*.MBX")))
\smallbreak
 ;;;Sample use of that logical pathname.  The return value
 ;;;is implementation-dependent.          
 (translate-logical-pathname "prog:mail;save;ideas.mail.3")
\EV #P"MY-VAX:SYS$DISK:[JOE.MAIL.PROG.SAVE]IDEAS.MBX.3"
\medbreak
 ;;;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.
\smallbreak
 ;;;For Unix with long file names
 (setf (logical-pathname-translations "prog")
       '(("CODE;*.*.*"             "/lib/prog/")))
\smallbreak
 ;;;Sample use of that logical pathname.  The return value
 ;;;is implementation-dependent.          
 (translate-logical-pathname "prog:code;documentation.lisp")
\EV #P"/lib/prog/documentation.lisp"
\smallbreak
 ;;;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")
\EV #P"/lib/prog/docum.lisp"
\medbreak
 ;;;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/")))
\smallbreak
 ;;;Sample use of that logical pathname.  The return value
 ;;;is implementation-dependent.          
 (translate-logical-pathname "prog:code;documentation.lisp")
\EV #P"/lib/prog/documentatio.l"
\medbreak
 ;;;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")
\EV #P"PGDOC"
\endcode

\label Affected By:\None.

\label Exceptional Situations::

If \param{host} is incorrectly supplied, 
an error \oftype{type-error} is signaled.

\label See Also::

\typeref{logical-pathname},
\issue{FILE-OPEN-ERROR:SIGNAL-FILE-ERROR}
{\secref\PathnamesAsFilenames}
\endissue{FILE-OPEN-ERROR:SIGNAL-FILE-ERROR}

\label Notes::

Implementations can define additional \term{functions}
that operate on \term{logical pathname} hosts,
for example to specify additional translation rules or options.
 
\endissue{PATHNAME-LOGICAL:ADD}

\endcom%{logical-pathname-translations}

%%% ========== LOGICAL-PATHNAME
\begincom{logical-pathname}\ftype{Function}

\issue{PATHNAME-LOGICAL:ADD}

\label Syntax:: 

\DefunWithValues logical-pathname {pathspec} {logical-pathname}

\label Arguments and Values::

\param{pathspec}---a \term{logical pathname}, 
		   a \term{logical pathname} \term{namestring},
		or a \term{stream}.

\param{logical-pathname}---a \term{logical pathname}.

\label Description::

\funref{logical-pathname} converts \param{pathspec} to a
\term{logical pathname} and returns the new \term{logical pathname}.
If \param{pathspec} is a \term{logical pathname} \term{namestring},
it should contain a host component and its following \term{colon}.
If \param{pathspec} is a \term{stream}, it should be one
for which \funref{pathname} returns a \term{logical pathname}.  
 
\issue{CLOSED-STREAM-FUNCTIONS:ALLOW-INQUIRY}
If \param{pathspec} is a \term{stream}, the \term{stream} can be either open or closed.
\funref{logical-pathname} returns the same \term{logical pathname} after a
file is closed as it did when the file was open.
\endissue{CLOSED-STREAM-FUNCTIONS:ALLOW-INQUIRY}
\issue{PATHNAME-STREAM}
It is an error if \param{pathspec} is a \term{stream} that is 
created with
  \funref{make-two-way-stream}, 
  \funref{make-echo-stream},             
  \funref{make-broadcast-stream}, 
  \funref{make-concatenated-stream},
  \funref{make-string-input-stream},
or
  \funref{make-string-output-stream}.
\endissue{PATHNAME-STREAM}

\label Examples:\None.

\label Affected By:\None.

\label Exceptional Situations::

Signals an error \oftype{type-error} if \param{pathspec} isn't supplied correctly.

\label See Also::

\typeref{logical-pathname},
\funref{translate-logical-pathname},
{\secref\LogicalPathnames}

\label Notes:\None.

\endissue{PATHNAME-LOGICAL:ADD}

\endcom%{logical-pathname}

%-------------------- Pathname Parsing --------------------

%%% ========== DEFAULT-PATHNAME-DEFAULTS
\begincom{*default-pathname-defaults*}\ftype{Variable}

\label Value Type::

a \term{pathname} \term{object}.

\label Initial Value::

%I added this first little phrase. -kmp 12-Jan-91
An \term{implementation-dependent} \term{pathname}, 
typically in the working directory that was current when \clisp\ was started up.

\label Description::

%% 23.1.2 26
a \term{pathname}, used as the default whenever a \term{function}
needs a default \term{pathname} and one is not supplied.

\label Examples::                                                   
\code
 ;; This example illustrates a possible usage for a hypothetical Lisp running on a
 ;; DEC TOPS-20 file system.  Since pathname conventions vary between Lisp 
 ;; implementations and host file system types, it is not possible to provide a
 ;; general-purpose, conforming example.
 *default-pathname-defaults* \EV #P"PS:<FRED>"
 (merge-pathnames (make-pathname :name "CALENDAR"))
\EV #P"PS:<FRED>CALENDAR"
 (let ((*default-pathname-defaults* (pathname "<MARY>")))
   (merge-pathnames (make-pathname :name "CALENDAR")))
\EV #P"<MARY>CALENDAR"
\endcode

\label Affected By::

The \term{implementation}.

\label See Also:\None.

\label Notes:\None.

\endcom%{*default-pathname-defaults*}

%-------------------- Pathname Namestrings --------------------

%%% ========== NAMESTRING
%%% ========== FILE-NAMESTRING
%%% ========== DIRECTORY-NAMESTRING
%%% ========== HOST-NAMESTRING
%%% ========== ENOUGH-NAMESTRING

\begincom{namestring, file-namestring, directory-namestring, 
          host-namestring, enough-namestring}\ftype{Function}
                                                 
\label Syntax::

\DefunWithValues namestring {pathname} {namestring}

\DefunWithValues file-namestring      {pathname} {namestring}
\DefunWithValues directory-namestring {pathname} {namestring}
\DefunWithValues host-namestring      {pathname} {namestring}

\DefunWithValues enough-namestring    {pathname {\opt} defaults} {namestring}

\label Arguments and Values::

\issue{PATHNAME-STREAM}
\param{pathname}---a \term{pathname designator}.
\endissue{PATHNAME-STREAM}                 

\issue{PATHNAME-SYMBOL}
\param{defaults}---a \term{pathname designator}.
\endissue{PATHNAME-SYMBOL}
 \Default{\thevalueof{*default-pathname-defaults*}}

\param{namestring}---a \term{string} or \nil.
\editornote{KMP: Under what circumstances can NIL be returned??}%!!!

\label Description::

\issue{PATHNAME-SYMBOL}
% Reference to conversion of symbol to a pathname removed.
\endissue{PATHNAME-SYMBOL}

These functions convert \param{pathname} into a namestring.
%% 23.1.2 31
The name represented by \param{pathname} is returned as a \term{namestring}
in an \term{implementation-dependent} canonical form.

%% 23.1.2 33
\funref{namestring} returns the full form of \param{pathname}.

\funref{file-namestring} returns just the name, type, and version
 components of \param{pathname}.

\funref{directory-namestring} returns the directory name portion.

\funref{host-namestring} returns the host name. 
%% 23.1.2 34

\funref{enough-namestring} returns an abbreviated namestring 
 that is just sufficient to identify the file named by \param{pathname}
 when considered relative to the \param{defaults}.
 It is required that

\code
 (merge-pathnames (enough-namestring pathname defaults) defaults)
\EQ (merge-pathnames (parse-namestring pathname nil defaults) defaults)
\endcode
in all cases, and the result of \funref{enough-namestring} is
the shortest reasonable \term{string} that will satisfy this criterion.

It is not necessarily possible to construct a valid \term{namestring} 
by concatenating some of the three shorter \term{namestrings} in some order.

\label Examples::

%!!! This example needs to use real filenames instead of "\i{directory-name}", etc.
\code
 (namestring "getty")            
\EV "getty"
 (setq q (make-pathname :host "kathy" 
                         :directory 
                           (pathname-directory *default-pathname-defaults*)
                         :name "getty")) 
\EV #S(PATHNAME :HOST "kathy" :DEVICE NIL :DIRECTORY \i{directory-name} 
       :NAME "getty" :TYPE NIL :VERSION NIL)
 (file-namestring q) \EV "getty"
 (directory-namestring q) \EV \i{directory-name}
 (host-namestring q) \EV "kathy" 
\endcode
\issue{PATHNAME-WILD:NEW-FUNCTIONS}
\code
 ;;;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-*.*"))
\EV "/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-*.*"))
\EV "/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$DISK:[D*.BACKUP.HACKS]BACKUP-*.*"))
\EV "V:SYS$DISK:[DMR.BACKUP.HACKS]BACKUP-FROB.LSP"
 (namestring
   (translate-pathname "U:/usr/dmr/hacks/frob.l"
                       "U:/usr/d*/hacks/fr*.l"
                       "V:SYS$DISK:[D*.BACKUP.HACKS]BACKUP-*.*"))
\EV "V:SYS$DISK:[DMR.BACKUP.HACKS]BACKUP-OB.LSP"
\endcode
\endissue{PATHNAME-WILD:NEW-FUNCTIONS} 


\label Affected By:\None.

\label Exceptional Situations:\None.

\label See Also::

\issue{PATHNAME-LOGICAL:ADD}
\funref{truename},
\funref{merge-pathnames},
\typeref{pathname},
\typeref{logical-pathname},
{\secref\FileSystemConcepts},
\endissue{PATHNAME-LOGICAL:ADD}
\issue{FILE-OPEN-ERROR:SIGNAL-FILE-ERROR}
{\secref\PathnamesAsFilenames}
\endissue{FILE-OPEN-ERROR:SIGNAL-FILE-ERROR}

\label Notes:\None.
 
\endcom%{namestring, ...}

%%% ========== PARSE-NAMESTRING
\begincom{parse-namestring}\ftype{Function}

\label Syntax::

\DefunWithValuesNewline parse-namestring
		        {thing {\opt} host default-pathname {\key} start end junk-allowed}
			{pathname, position}
                                       
\label Arguments and Values::

\issue{PATHNAME-SYMBOL}
\issue{PATHNAME-LOGICAL:ADD}
\param{thing}---a \term{string},
	        a \term{pathname},
	     or a \term{stream associated with a file}.
%% This isn't quite right.  The start/end thing puts a wrinkle in things. -kmp 29-Aug-93
%\term{pathname designator}
\endissue{PATHNAME-LOGICAL:ADD}
\endissue{PATHNAME-SYMBOL}

\issue{PATHNAME-LOGICAL:ADD}
\issue{PATHNAME-UNSPECIFIC-COMPONENT:NEW-TOKEN}
%% Added NIL here because the Description seemed to permit it. -kmp 29-Aug-93
\param{host}---a \term{valid pathname host}, a \term{logical host}, or \nil.
\endissue{PATHNAME-UNSPECIFIC-COMPONENT:NEW-TOKEN}
\endissue{PATHNAME-LOGICAL:ADD}

\param{default-pathname}---a \term{pathname designator}.
 \Default{\thevalueof{*default-pathname-defaults*}}

%% This should go without saying!! -kmp 29-Aug-93
%It is an error if optional arguments do not accompany keyword arguments.

\issue{SUBSEQ-OUT-OF-BOUNDS}
\issue{RANGE-OF-START-AND-END-PARAMETERS:INTEGER-AND-INTEGER-NIL}
\param{start}, \param{end}---\term{bounding index designators} of \param{thing}.
 \Defaults{\param{start} and \param{end}}{\f{0} and \nil}
\endissue{RANGE-OF-START-AND-END-PARAMETERS:INTEGER-AND-INTEGER-NIL}
\endissue{SUBSEQ-OUT-OF-BOUNDS}

\param{junk-allowed}---a \term{generalized boolean}.
  \Default{\term{false}}
                                       
\param{pathname}---a \term{pathname}, or \nil.

\param{position}---a \term{bounding index designator} for \param{thing}.

\label Description::

%% 23.1.2 9
%% 23.1.2 10
Converts \param{thing} into a \term{pathname}.

The \param{host} supplies a host name with respect to which the parsing occurs.
%% Removed per X3J13. -kmp 05-Oct-93
% If \param{host} is \nil,
% then the host name is extracted from \param{default-pathname}
% and used to determine the syntax convention.  

\issue{PATHNAME-STREAM}
If \param{thing} is a \term{stream associated with a file},
processing proceeds as if the \term{pathname} used to open that \term{file}
had been supplied instead.
\endissue{PATHNAME-STREAM}

If \param{thing} is a \term{pathname},
the \param{host} and the host component of \param{thing} are compared.
%% 23.1.2 15    
%If \param{thing} is not a \term{string}, then \param{start} is returned as the second value.
If they match, 
two values are immediately returned: \param{thing} and \param{start};
otherwise (if they do not match), an error is signaled.

\issue{PATHNAME-SYMBOL}
% If \param{thing} is a \term{symbol}, the print name is used.
\endissue{PATHNAME-SYMBOL}

%% 23.1.2 11
Otherwise (if \param{thing} is a \term{string}),
\funref{parse-namestring} parses the name of a \term{file} within
the substring of \param{thing} bounded by \param{start} and \param{end}.

\issue{PATHNAME-LOGICAL:ADD}
\issue{PATHNAME-HOST-PARSING:RECOGNIZE-LOGICAL-HOST-NAMES}
%% Replaced (again) per X3J13. -kmp 05-Oct-93
% \param{thing} is recognized as a \term{logical pathname} \term{namestring}
% when \param{host} is a \term{logical host} 
%        (or a \term{string} that names a defined \term{logical host}),
%      \param{default-pathname} is a \term{logical pathname},
% %% Per X3J13. -kmp 05-Oct-93
% %   or the substring begins with the name of a defined \term{logical host}
% %      followed by a \term{colon}.
% or \param{host} is unsupplied and \param{thing} is a \term{string} 
% that is a syntactically valid \term{logical pathname} \term{namestring}
% containing an explicit host.
If \param{thing} is a \term{string} then 
%% I added this. -kmp 05-Oct-93
% it
the substring of \param{thing} \term{bounded} by \param{start} and \param{end}
is parsed into a \term{pathname} 
as follows:

\beginlist

\itemitem{\bull} 
  If \param{host} is a \term{logical host} then \param{thing} is parsed
  as a \term{logical pathname} \term{namestring} 
%% I added this. -kmp 05-Oct-93
  on the \param{host}.

\itemitem{\bull}
  If \param{host} is \nil\ and \param{thing} is a syntactically valid 
  \term{logical pathname} \term{namestring} containing an explicit host,
  then it is parsed as a \term{logical pathname} \term{namestring}.

\itemitem{\bull}
  If  \param{host} is \nil,
      \param{default-pathname} is a \term{logical pathname},
  and \param{thing} is a syntactically valid \term{logical pathname} \term{namestring}
       without an explicit host,
  then it is parsed as a \term{logical pathname} \term{namestring}
%% Wording simplified by me. -kmp 05-Oct-93
%         with the host from \param{default-pathname} 
%          used as the host for the resulting \term{pathname}.
        on the host that is the host component of \param{default-pathname}.

\itemitem{\bull}
  Otherwise, the parsing of \param{thing} is \term{implementation-defined}.

\endlist

In the first 
%% Changed to match wording voted by X3J13 above. -kmp 05-Oct-93
%two
of these
%% Don't bother trying to count. -kmp 05-Oct-93
%three
cases,
the host portion of the \term{logical pathname} namestring
and its following \term{colon} are optional.
% Whether a host argument is logical if it is a \term{string} 
% that is \term{string equal} to a \term{logical pathname} host name is
% \term{implementation-defined}.
\endissue{PATHNAME-HOST-PARSING:RECOGNIZE-LOGICAL-HOST-NAMES}
\endissue{PATHNAME-LOGICAL:ADD}

If the host portion of the namestring and \param{host} 
are both present and do not match,
an error is signaled.               

%% 23.1.2 12
If \param{junk-allowed} is \term{true},
then the \term{primary value} is the \term{pathname} parsed 
or, if no syntactically correct \term{pathname} was seen, \nil.
%% 23.1.2 13
If \param{junk-allowed} is \term{false},
then the entire substring is scanned, 
and the \term{primary value} is the \term{pathname} parsed.

%% 23.1.2 14
In either case, the \term{secondary value}
is the index into \param{thing} of the delimiter that terminated the parse,
or the index beyond the substring if the parse terminated at the end of the substring
  (as will always be the case if \param{junk-allowed} is \term{false}).

%% 23.1.2 16
Parsing a \term{null} \term{string} always succeeds,
producing a \term{pathname} with all components (except the host) equal to \nil.

%% 23.1.2 18
If \param{thing} contains an explicit host name and no explicit device name,
then it is \term{implementation-defined} whether \funref{parse-namestring}
will supply the standard default device for that host as the device component
of the resulting \term{pathname}.

\label Examples::

\issue{PATHNAME-PRINT-READ:SHARPSIGN-P}
\code
 (setq q (parse-namestring "test"))  
\EV #S(PATHNAME :HOST NIL :DEVICE NIL :DIRECTORY NIL :NAME "test" 
       :TYPE NIL :VERSION NIL)
 (pathnamep q) \EV \term{true}
 (parse-namestring "test") 
\EV #S(PATHNAME :HOST NIL :DEVICE NIL :DIRECTORY NIL :NAME "test"
       :TYPE NIL :VERSION NIL), 4
 (setq s (open \i{xxx})) \EV #<Input File Stream...>
 (parse-namestring s) 
\EV #S(PATHNAME :HOST NIL :DEVICE NIL :DIRECTORY NIL :NAME \i{xxx} 
       :TYPE NIL :VERSION NIL), 0
 (parse-namestring "test" nil nil :start 2 :end 4 )
 \EV #S(PATHNAME ...), 15
 (parse-namestring "foo.lisp")
\EV #P"foo.lisp"
\endcode
\endissue{PATHNAME-PRINT-READ:SHARPSIGN-P}

\label Affected By:\None.

\label Exceptional Situations::           

If \param{junk-allowed} is \term{false},
an error \oftype{parse-error} is signaled if \param{thing} 
does not consist entirely of the representation of a \term{pathname}, 
possibly surrounded on either side by \term{whitespace}\meaning{1} characters if that is
appropriate to the cultural conventions of the implementation.

%% 23.1.2 17
If \param{host} is supplied and not \nil,
and \param{thing} contains a manifest host name, 
an error \oftype{error} is signaled if the hosts do not match.

\issue{PATHNAME-LOGICAL:ADD}
If \param{thing} is a \term{logical pathname} namestring
and if the host portion of the namestring and \param{host} 
are both present and do not match,
an error \oftype{error} is signaled.               
\endissue{PATHNAME-LOGICAL:ADD}

%% This is implied by stream associated with a file. -kmp 29-Aug-93
% \issue{PATHNAME-STREAM}
% It is an error if \param{thing} is a \term{stream} that is 
% created with \funref{make-two-way-stream}, 
% 	     \funref{make-echo-stream},
% 	     \funref{make-broadcast-stream}, 
% 	     \funref{make-concatenated-stream},
% 	     \funref{make-string-input-stream},
% 	     \funref{make-string-output-stream}.
% \endissue{PATHNAME-STREAM}

\label See Also::

\issue{PATHNAME-LOGICAL:ADD}
\typeref{pathname},
\typeref{logical-pathname},
{\secref\FileSystemConcepts},
\endissue{PATHNAME-LOGICAL:ADD}
{\secref\UnspecificComponent},
\issue{FILE-OPEN-ERROR:SIGNAL-FILE-ERROR}
{\secref\PathnamesAsFilenames}
\endissue{FILE-OPEN-ERROR:SIGNAL-FILE-ERROR}

\label Notes:\None.

\endcom%{parse-namestring}

%-------------------- Pathname Matching --------------------

%%% ========== WILD-PATHNAME-P
\begincom{wild-pathname-p}\ftype{Function}

\issue{PATHNAME-WILD:NEW-FUNCTIONS}

\label Syntax:: 

\DefunWithValues wild-pathname-p {pathname {\opt} field-key} {generalized-boolean}

\label Arguments and Values::

\issue{PATHNAME-STREAM}
\param{pathname}---a \term{pathname designator}.
\endissue{PATHNAME-STREAM}

\param{Field-key}---one of \kwd{host},
			   \kwd{device}
			   \kwd{directory},
			   \kwd{name},
			   \kwd{type},
		 	   \kwd{version},
			or \nil.

\param{generalized-boolean}---a \term{generalized boolean}.

\label Description::

\funref{wild-pathname-p} tests \param{pathname} for the presence of wildcard components.  
  
If \param{pathname} is a \term{pathname} (as returned by \funref{pathname})
it represents the name used to open the file. This may be, but is
not required to be, the actual name of the file. 

If \param{field-key} is not supplied or \nil, \funref{wild-pathname-p}    
returns true if \param{pathname} has any wildcard components, \nil\ 
if \param{pathname} has none.
If \param{field-key} is \term{non-nil}, \funref{wild-pathname-p}    
returns true if the indicated component of \param{pathname} is a wildcard, 
\nil\ if the component is not a wildcard.  

\label Examples::
\code
 ;;;The following examples are not portable.  They are written to run
 ;;;with particular file systems and particular wildcard conventions.
 ;;;Other implementations will behave differently.  These examples are
 ;;;intended to be illustrative, not to be prescriptive.
 
 (wild-pathname-p (make-pathname :name :wild)) \EV \term{true}
 (wild-pathname-p (make-pathname :name :wild) :name) \EV \term{true}
 (wild-pathname-p (make-pathname :name :wild) :type) \EV \term{false}
 (wild-pathname-p (pathname "s:>foo>**>")) \EV \term{true} ;Lispm
 (wild-pathname-p (pathname :name "F*O")) \EV \term{true} ;Most places
\endcode

\label Affected By:\None.

\label Exceptional Situations::

If \param{pathname} is not a \term{pathname}, a \term{string}, 
or a \term{stream associated with a file} an error \oftype{type-error} is signaled.

\label See Also::

\issue{PATHNAME-LOGICAL:ADD}
\typeref{pathname},
\typeref{logical-pathname},
{\secref\FileSystemConcepts},
\endissue{PATHNAME-LOGICAL:ADD}
\issue{FILE-OPEN-ERROR:SIGNAL-FILE-ERROR}
{\secref\PathnamesAsFilenames}
\endissue{FILE-OPEN-ERROR:SIGNAL-FILE-ERROR}

\label Notes::

Not all implementations support wildcards in all fields.
\Seesection\WildComponents\ and \secref\WildcardRestrictions.
                                  
\endissue{PATHNAME-WILD:NEW-FUNCTIONS}
\endcom%{wild-pathname-p}

%%% ========== PATHNAME-MATCH-P
\begincom{pathname-match-p}\ftype{Function}

\issue{PATHNAME-WILD:NEW-FUNCTIONS}

\label Syntax:: 

\DefunWithValues pathname-match-p {pathname wildcard} {generalized-boolean}

\label Arguments and Values:: 

\issue{PATHNAME-STREAM}
\param{pathname}---a \term{pathname designator}.

\param{wildcard}---a \term{designator} for a \term{wild} \term{pathname}.
\endissue{PATHNAME-STREAM}

\param{generalized-boolean}---a \term{generalized boolean}.

\label Description::

\funref{pathname-match-p} returns true if 
\param{pathname} matches \param{wildcard}, otherwise \nil.  The 
matching rules are \term{implementation-defined} but should be consistent with 
\funref{directory}. Missing components of \param{wildcard} default to \kwd{wild}.
 
It is valid for \param{pathname} to be a wild \term{pathname}; 
a wildcard field in \param{pathname} only matches a
wildcard field in \param{wildcard} (\ie 
\funref{pathname-match-p} is not commutative).
It is valid for \param{wildcard} to be a non-wild \term{pathname}.
 
\label Examples:\None.

\label Affected By:\None.

\label Exceptional Situations::

If \param{pathname} or \param{wildcard} is not a \term{pathname}, \term{string}, 
or \term{stream associated with a file} an error \oftype{type-error} is signaled.

\label See Also::

\issue{PATHNAME-LOGICAL:ADD}
\funref{directory},
\typeref{pathname},
\typeref{logical-pathname},
{\secref\FileSystemConcepts},
\endissue{PATHNAME-LOGICAL:ADD}
\issue{FILE-OPEN-ERROR:SIGNAL-FILE-ERROR}
{\secref\PathnamesAsFilenames}
\endissue{FILE-OPEN-ERROR:SIGNAL-FILE-ERROR}

\label Notes:\None.

\endissue{PATHNAME-WILD:NEW-FUNCTIONS}
\endcom%{pathname-match-p}

%%% ========== TRANSLATE-LOGICAL-PATHNAME
\begincom{translate-logical-pathname}\ftype{Function}

\issue{PATHNAME-LOGICAL:ADD}

\label Syntax:: 

\DefunWithValues translate-logical-pathname {pathname {\key}} {physical-pathname}

\label Arguments and Values:: 

\param{pathname}---a \term{pathname designator},
		or a \term{logical pathname} \term{namestring}.

\param{physical-pathname}---a \term{physical pathname}.

\label Description::

Translates \param{pathname} to a \term{physical pathname}, which it returns.
                                                    
\issue{CLOSED-STREAM-FUNCTIONS:ALLOW-INQUIRY}
If \param{pathname} is a \term{stream}, the
\term{stream} can be either open or closed.
\funref{translate-logical-pathname} returns the same 
physical pathname after a
    file is closed as it did when the file was open.
\endissue{CLOSED-STREAM-FUNCTIONS:ALLOW-INQUIRY}
\issue{PATHNAME-STREAM}
It is an error if \param{pathname} is a \term{stream} that is 
created with \funref{make-two-way-stream}, 
\funref{make-echo-stream},             
\funref{make-broadcast-stream}, 
\funref{make-concatenated-stream}, \funref{make-string-input-stream},
\funref{make-string-output-stream}.
\endissue{PATHNAME-STREAM}

If \param{pathname} is a \term{logical pathname} namestring,
the host portion of the 
\term{logical pathname} namestring and its following \term{colon} are required.
 

\param{Pathname} is first coerced to a \term{pathname}.
If the coerced \param{pathname} is a physical pathname, it is returned.
If the coerced \param{pathname} is a \term{logical pathname},
the first matching translation (according to \funref{pathname-match-p})
of the \term{logical pathname} host is applied, as if by calling 
\funref{translate-pathname}.  If the result is
    a \term{logical pathname}, this process is repeated.  
When the result is
    finally a physical pathname, it is returned.
    If no translation matches, an error 
is signaled.

\funref{translate-logical-pathname} might perform additional translations,
    typically to provide translation of file types to local naming
    conventions, to accomodate physical file systems with limited length
    names, or to deal with special character requirements such as
    translating hyphens to underscores or uppercase letters to lowercase.
    Any such additional translations are \term{implementation-defined}.  Some
    implementations do no additional translations.

    There are no specified keyword arguments for
\funref{translate-logical-pathname}, 
but implementations are permitted to extend
    it by adding keyword arguments.  

%The following was deleted because part 2 of EXTRA-RETURN-VALUES didn't
%pass.
%There is one specified return value
%    from TRANSLATE-LOGICAL-PATHNAME; implementations are permitted to
%    extend it by returning additional values.
 

\label Examples::

See \funref{logical-pathname-translations}.

\label Affected By:\None.%!!! Not likely.

\label Exceptional Situations::

If \param{pathname} is incorrectly supplied, an error \oftype{type-error} is signaled.

If no translation matches, an error \oftype{file-error} is signaled.
\editornote{KMP: Is file-error really right, or should it be pathname-error?}

\label See Also::

\funref{logical-pathname},
\funref{logical-pathname-translations}, 
\typeref{logical-pathname},
{\secref\FileSystemConcepts},
\issue{FILE-OPEN-ERROR:SIGNAL-FILE-ERROR}
{\secref\PathnamesAsFilenames}
\endissue{FILE-OPEN-ERROR:SIGNAL-FILE-ERROR}

\label Notes:\None.

\endissue{PATHNAME-LOGICAL:ADD}

\endcom%{translate-logical-pathname}

%%% ========== TRANSLATE-PATHNAME
\begincom{translate-pathname}\ftype{Function}

\issue{PATHNAME-WILD:NEW-FUNCTIONS}

\label Syntax:: 

\DefunWithValuesNewline translate-pathname
		 	{source from-wildcard to-wildcard {\key}}
		 	{translated-pathname}

\label Arguments and Values:: 

\param{source}---a \term{pathname designator}.

\param{from-wildcard}---a \term{pathname designator}.

\param{to-wildcard}---a \term{pathname designator}.

\param{translated-pathname}---a \term{pathname}.

\label Description::

\funref{translate-pathname} translates \param{source} 
(that matches \param{from-wildcard}) into a corresponding \term{pathname} 
that matches \param{to-wildcard}, and returns the corresponding \term{pathname}.
 
The resulting \term{pathname} is \param{to-wildcard} with each wildcard or missing
field replaced by a portion of \param{source}.  A ``wildcard field'' is a
\term{pathname} component with a value of \kwd{wild}, a \kwd{wild} element of a
\term{list}-valued directory component, or an \term{implementation-defined} portion
of a component, such as the \f{"*"} in the complex wildcard string
\f{"foo*bar"} that some implementations support.  An implementation that
adds other wildcard features, such as regular expressions, must define
how \funref{translate-pathname} extends to those features.  
A ``missing field'' is a \term{pathname} component with a value of \nil.
 
    The portion of \param{source} 
that is copied into the resulting \term{pathname} is 
\term{implementation-defined}.  Typically 
it is determined by the user interface conventions
    of the file systems involved.  Usually it is the portion of \param{source}
    that matches a wildcard field of 
\param{from-wildcard} that is in the same
    position as the wildcard or missing field of 
\param{to-wildcard}.  If there
    is no wildcard field in 
\param{from-wildcard} at that position, then usually
    it is the entire corresponding 
\term{pathname} component of \param{source}, or in
    the case of a 
\term{list}-valued directory component, the entire corresponding
    \term{list} element.  

    During the copying of a portion of \param{source} into 
the resulting \term{pathname}, additional
    \term{implementation-defined} translations of \term{case} or file naming
    conventions might occur, especially when 
\param{from-wildcard} and
    \param{to-wildcard} are for different hosts.
 
It is valid for
    \param{source} to be a wild 
\term{pathname}; in general this will produce a wild
    result.  It 
is valid for \param{from-wildcard} and/or \param{to-wildcard} to be
    non-wild \term{pathnames}.  
    
    There are no specified keyword arguments for 
\funref{translate-pathname}, but
    implementations are permitted to extend it by adding keyword arguments.

%The following is deleted because part 2 of EXTRA-RETURN-VALUES didn't
%pass:
%
%    There is one specified return value from TRANSLATE-PATHNAME;
%    implementations are permitted to extend it by returning additional
%    values.
\issue{PATHNAME-COMPONENT-CASE:KEYWORD-ARGUMENT}
\issue{JUN90-TRIVIAL-ISSUES:5}
\funref{translate-pathname} maps customary case in
\param{source} into customary case in the output \term{pathname}.
\endissue{JUN90-TRIVIAL-ISSUES:5}
\endissue{PATHNAME-COMPONENT-CASE:KEYWORD-ARGUMENT}

 
\label Examples::

\code
 ;; The results of the following five forms are all implementation-dependent.
 ;; The second item in particular is shown with multiple results just to 
 ;; emphasize one of many particular variations which commonly occurs.
 (pathname-name (translate-pathname "foobar" "foo*" "*baz")) \EV "barbaz"
 (pathname-name (translate-pathname "foobar" "foo*" "*"))
\EV "foobar"
\OV "bar"
 (pathname-name (translate-pathname "foobar" "*"    "foo*")) \EV "foofoobar"
 (pathname-name (translate-pathname "bar"    "*"    "foo*")) \EV "foobar"
 (pathname-name (translate-pathname "foobar" "foo*" "baz*")) \EV "bazbar"

 (defun translate-logical-pathname-1 (pathname rules)
   (let ((rule (assoc pathname rules :test #'pathname-match-p)))
     (unless rule (error "No translation rule for ~A" pathname))
     (translate-pathname pathname (first rule) (second rule))))
 (translate-logical-pathname-1 "FOO:CODE;BASIC.LISP"
                       '(("FOO:DOCUMENTATION;" "MY-UNIX:/doc/foo/")
                         ("FOO:CODE;"          "MY-UNIX:/lib/foo/")
                         ("FOO:PATCHES;*;"     "MY-UNIX:/lib/foo/patch/*/")))
\EV #P"MY-UNIX:/lib/foo/basic.l"

;;;This example assumes one particular set of wildcard conventions
;;;Not all file systems will run this example exactly as written
 (defun rename-files (from to)
   (dolist (file (directory from))
     (rename-file file (translate-pathname file from to))))
 (rename-files "/usr/me/*.lisp" "/dev/her/*.l")
   ;Renames /usr/me/init.lisp to /dev/her/init.l
 (rename-files "/usr/me/pcl*/*" "/sys/pcl/*/")
   ;Renames /usr/me/pcl-5-may/low.lisp to /sys/pcl/pcl-5-may/low.lisp
   ;In some file systems the result might be /sys/pcl/5-may/low.lisp
 (rename-files "/usr/me/pcl*/*" "/sys/library/*/")
   ;Renames /usr/me/pcl-5-may/low.lisp to /sys/library/pcl-5-may/low.lisp
   ;In some file systems the result might be /sys/library/5-may/low.lisp
 (rename-files "/usr/me/foo.bar" "/usr/me2/")
   ;Renames /usr/me/foo.bar to /usr/me2/foo.bar
 (rename-files "/usr/joe/*-recipes.text" "/usr/jim/cookbook/joe's-*-rec.text")
   ;Renames /usr/joe/lamb-recipes.text to /usr/jim/cookbook/joe's-lamb-rec.text
   ;Renames /usr/joe/pork-recipes.text to /usr/jim/cookbook/joe's-pork-rec.text
   ;Renames /usr/joe/veg-recipes.text to /usr/jim/cookbook/joe's-veg-rec.text
\endcode

\label Affected By:\None.

\label Exceptional Situations::

If any of \param{source}, \param{from-wildcard}, or \param{to-wildcard}
is not a \term{pathname}, a \term{string}, or a \term{stream associated with a file}
an error \oftype{type-error} is signaled.  

\f{(pathname-match-p \param{source from-wildcard})} must
be true or an error \oftype{error} is signaled.

\label See Also::

\funref{namestring},
\funref{pathname-host},
\issue{PATHNAME-LOGICAL:ADD}
\typeref{pathname},
\typeref{logical-pathname},
{\secref\FileSystemConcepts},
\endissue{PATHNAME-LOGICAL:ADD}
\issue{FILE-OPEN-ERROR:SIGNAL-FILE-ERROR}
{\secref\PathnamesAsFilenames}
\endissue{FILE-OPEN-ERROR:SIGNAL-FILE-ERROR}

\label Notes::

The exact behavior of \funref{translate-pathname} cannot be dictated
by the \clisp\ language and must be allowed to vary, depending on the
user interface conventions of the file systems involved.

The following is an implementation guideline.
One file system performs this operation by
    examining each piece of the three 
\term{pathnames} in turn, where a piece is a
    \term{pathname} component or a 
\term{list} element of a structured component such as
    a hierarchical directory.  Hierarchical directory elements in
    \param{from-wildcard} and 
\param{to-wildcard} are matched by whether they are
    wildcards, not by depth in the directory hierarchy.  If the piece in
\param{to-wildcard} is present and not wild, it is copied into the result.
    If the piece in \param{to-wildcard} is 
\kwd{wild} or \nil, the piece in \param{source} is
    copied into the result.  Otherwise, the piece in
\param{to-wildcard} might be
    a complex wildcard such as \f{"foo*bar"} and the piece in 
\param{from-wildcard}
    should be wild; the portion of the piece in 
\param{source} that matches the
    wildcard portion of the piece in 
\param{from-wildcard} replaces the wildcard
    portion of the piece in 
\param{to-wildcard} and the value produced is used in
    the result.

\endissue{PATHNAME-WILD:NEW-FUNCTIONS}
\endcom%{translate-pathname}

%-------------------- Pathname Merging --------------------

%%% ========== MERGE-PATHNAMES
\begincom{merge-pathnames}\ftype{Function}

\label Syntax:: 

\DefunWithValuesNewline merge-pathnames
		 	{pathname {\opt} default-pathname default-version}
			{merged-pathname}

\label Arguments and Values::

\issue{PATHNAME-STREAM}  
\param{pathname}---a \term{pathname designator}.
\endissue{PATHNAME-STREAM}

\issue{PATHNAME-STREAM}
%% 23.1.2 20
\param{default-pathname}---a \term{pathname designator}.
\endissue{PATHNAME-STREAM}
 \Default{\thevalueof{*default-pathname-defaults*}}

\issue{PATHNAME-UNSPECIFIC-COMPONENT:NEW-TOKEN}
\param{default-version}---a \term{valid pathname version}.
\endissue{PATHNAME-UNSPECIFIC-COMPONENT:NEW-TOKEN}
 \Default{\kwd{newest}}

\param{merged-pathname}---a \term{pathname}.

\label Description::

%% 23.1.2 19
Constructs a \term{pathname} from \param{pathname} 
by filling in any unsupplied components with the corresponding values
from \param{default-pathname} and \param{default-version}. 

%% 23.1.2 22
Defaulting of pathname components 
is done by filling in components taken from another \term{pathname}.
\issue{COMPILE-FILE-OUTPUT-FILE-DEFAULTS:INPUT-FILE}
% Unsupplied components of the output \term{pathname} come from \param{pathname},
% except that the type should default not to the type of \param{pathname} 
% but to the appropriate default type for output from this program.
This is especially useful for cases such as 
a program that has an input file and an output file.
Unspecified components of the output pathname will come from the input pathname,
except that the type should not default
%% "not" removed per X3J13. -kmp 05-Oct-93
%not
to the type of the input pathname
but rather to the appropriate default type for output from the program;
for example, \seefun{compile-file-pathname}.
\endissue{COMPILE-FILE-OUTPUT-FILE-DEFAULTS:INPUT-FILE}

%% 23.1.2 23
If no version is supplied, \param{default-version} is used.
If \param{default-version} is \nil, the version component will remain unchanged.

%% 23.1.2 24
If \param{pathname} explicitly specifies a host and not a device, and 
if the host component of \param{default-pathname} matches the host component
of \param{pathname}, then the device is taken from the \param{default-pathname};
otherwise the device will be the default file device for that host.  If
\param{pathname} does not specify a host, device, directory, name,
or type, each such component is copied from \param{default-pathname}.
If \param{pathname} does not specify a name, then the version, if not provided, will
come from \param{default-pathname}, just like the other components.  If
\param{pathname} does specify a name, then the version is not affected
by \param{default-pathname}. If this process leaves the
version missing, the \param{default-version} is used.
If the host's file name syntax provides a way
to input a version without a name or type, the user can let the name
and type default but supply a version different from the one in \param{default-pathname}.

\issue{CLOSED-STREAM-FUNCTIONS:ALLOW-INQUIRY}
If \param{pathname} is a \term{stream}, \param{pathname} effectively
becomes \f{(pathname \param{pathname})}. \funref{merge-pathnames}
can be used on either an open or a closed \term{stream}.
\endissue{CLOSED-STREAM-FUNCTIONS:ALLOW-INQUIRY}
%% This follows from "stream associated with a file",
%% which is implicit in "pathname designator".
% \issue{PATHNAME-STREAM}
% It is an error if \param{pathname} is a \term{stream} that is 
% created with \funref{make-two-way-stream}, 
% \funref{make-echo-stream},
% \funref{make-broadcast-stream}, 
% \funref{make-concatenated-stream}, \funref{make-string-input-stream},
% \funref{make-string-output-stream}.
% \endissue{PATHNAME-STREAM}

If \param{pathname} is a \term{pathname}
%% Superfluous. -kmp 29-Aug-93
%(as returned by \funref{pathname})
it represents the name used to open the file. This may be, but is
not required to be, the actual name of the file. 

\issue{PATHNAME-LOGICAL:ADD}
\funref{merge-pathnames} recognizes a \term{logical pathname} \term{namestring}
   when \param{default-pathname} is a \term{logical pathname},
\issue{PATHNAME-HOST-PARSING:RECOGNIZE-LOGICAL-HOST-NAMES}
or when the \term{namestring} begins with 
    the name of a defined \term{logical host} followed by a \term{colon}.
In the first of these two cases,
\endissue{PATHNAME-HOST-PARSING:RECOGNIZE-LOGICAL-HOST-NAMES}
the host portion of the \term{logical pathname} \term{namestring}
and its following \term{colon} are optional.
\endissue{PATHNAME-LOGICAL:ADD}

\issue{PATHNAME-LOGICAL:ADD}
\funref{merge-pathnames} returns a 
\term{logical pathname} if and only if
   its first argument is a \term{logical pathname},
\issue{PATHNAME-HOST-PARSING:RECOGNIZE-LOGICAL-HOST-NAMES}
or its first argument is a \term{logical pathname} \term{namestring} with an explicit host,
or its first argument does not specify a host 
    and the \param{default-pathname} is a \term{logical pathname}.
\endissue{PATHNAME-HOST-PARSING:RECOGNIZE-LOGICAL-HOST-NAMES}
\endissue{PATHNAME-LOGICAL:ADD}
 
\issue{PATHNAME-SUBDIRECTORY-LIST:NEW-REPRESENTATION}
\term{Pathname} merging treats a relative directory specially.  
If \f{(pathname-directory \param{pathname})} is a \term{list} whose
\term{car} is \kwd{relative}, and 
\f{(pathname-directory \param{default-pathname})} is a \term{list}, then
the merged directory is the value of

\code
 (append (pathname-directory \param{default-pathname})
         (cdr  ;remove :relative from the front
           (pathname-directory \param{pathname})))
\endcode
except that if the resulting \term{list} contains a \term{string} or \kwd{wild}
immediately followed by \kwd{back}, both of them are removed.  This removal of 
redundant \kwd{back} \term{keywords} is repeated as many times as possible.
If \f{(pathname-directory \param{default-pathname})} is not a \term{list} or
\f{(pathname-directory \param{pathname})} is not a \term{list} 
whose \term{car} is \kwd{relative}, the merged directory is
\f{(or (pathname-directory \param{pathname}) (pathname-directory \param{default-pathname}))}
\endissue{PATHNAME-SUBDIRECTORY-LIST:NEW-REPRESENTATION}

\issue{PATHNAME-COMPONENT-CASE:KEYWORD-ARGUMENT}
\funref{merge-pathnames} maps customary case in \param{pathname} 
into customary case in the output \term{pathname}.
\endissue{PATHNAME-COMPONENT-CASE:KEYWORD-ARGUMENT}

\label Examples::
%% 23.1.2 21
\code
 (merge-pathnames "CMUC::FORMAT"
                  "CMUC::PS:<LISPIO>.FASL")
\EV #P"CMUC::PS:<LISPIO>FORMAT.FASL.0"
\endcode

\label Affected By:\None.

\label Exceptional Situations:\None.

\label See Also::

\issue{PATHNAME-LOGICAL:ADD}
\varref{*default-pathname-defaults*},
\typeref{pathname},
\typeref{logical-pathname},
{\secref\FileSystemConcepts},
\endissue{PATHNAME-LOGICAL:ADD}
\issue{FILE-OPEN-ERROR:SIGNAL-FILE-ERROR}
{\secref\PathnamesAsFilenames}
\endissue{FILE-OPEN-ERROR:SIGNAL-FILE-ERROR}

\label Notes::
 
%% 23.1.2 25
The net effect 
%% removed as redundant to avoid making this paragraph run onto next page by one word.
% of \funref{merge-pathnames} 
is that if just a name is supplied, 
%% ditto.
%then
the host, device, directory, and type will come from \param{default-pathname}, 
but the version will come from \param{default-version}.
If nothing or just a directory is supplied,
the name, type, and version will come from \param{default-pathname} together.

\endcom%{merge-pathnames}