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116 lines
6.5 KiB
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<!DOCTYPE HTML PUBLIC "-//W3O//DTD W3 HTML 2.0//EN">
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<!Converted with LaTeX2HTML 0.6.5 (Tue Nov 15 1994) by Nikos Drakos (nikos@cbl.leeds.ac.uk), CBLU, University of Leeds >
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<HEAD>
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<TITLE>23.1.5.4. Examples of the Use of Logical Pathnames</TITLE>
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<BODY>
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<meta name="description" value=" Examples of the Use of Logical Pathnames">
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<meta name="keywords" value="clm">
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<meta name="resource-type" value="document">
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<meta name="distribution" value="global">
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<P>
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<b>Common Lisp the Language, 2nd Edition</b>
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<BR> <HR><A NAME=tex2html4208 HREF="node213.html"><IMG ALIGN=BOTTOM ALT="next" SRC="icons/next_motif.gif"></A> <A NAME=tex2html4206 HREF="node208.html"><IMG ALIGN=BOTTOM ALT="up" SRC="icons/up_motif.gif"></A> <A NAME=tex2html4200 HREF="node211.html"><IMG ALIGN=BOTTOM ALT="previous" SRC="icons/previous_motif.gif"></A> <A NAME=tex2html4210 HREF="node1.html"><IMG ALIGN=BOTTOM ALT="contents" SRC="icons/contents_motif.gif"></A> <A NAME=tex2html4211 HREF="index.html"><IMG ALIGN=BOTTOM ALT="index" SRC="icons/index_motif.gif"></A> <BR>
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<B> Next:</B> <A NAME=tex2html4209 HREF="node213.html"> Discussion of Logical </A>
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<B>Up:</B> <A NAME=tex2html4207 HREF="node208.html"> Logical Pathnames</A>
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<B> Previous:</B> <A NAME=tex2html4201 HREF="node211.html"> Using Logical Pathnames</A>
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<HR> <P>
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<H3><A NAME=SECTION002715400000000000000>23.1.5.4. Examples of the Use of Logical Pathnames</A></H3>
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<P>
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<img align=bottom alt="change_begin" src="gif/change_begin.gif"><br>
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Here is a very simple example of setting up a logical pathname host named <tt>FOO</tt>.
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Suppose that no
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translations are necessary to get around file system restrictions, so
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all that is necessary is to specify the root of the physical directory
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tree that contains the logical file system.
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The namestring syntax in the to-wildname is implementation-specific.
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<P><pre>
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(setf (logical-pathname-translations "foo")
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'(("**;*.*.*" "MY-LISPM:>library>foo>**>")))
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</pre><P>
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The following is a sample use of that logical pathname. All return values
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are of course implementation-specific; all of the examples in this section
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are of course meant to be illustrative and not prescriptive.
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<P><pre>
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(translate-logical-pathname "foo:bar;baz;mum.quux.3")
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=> #P"MY-LISPM:>library>foo>bar>baz>mum.quux.3"
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</pre><P>
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<P>
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Next we have a more complex example, dividing the files among two file servers
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(<tt>U</tt>, supporting a UNIX file system, and <tt>V</tt>, supporting a VAX/VMS file system)
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and several different directories. This UNIX file system doesn't support
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<tt>:wild-inferiors</tt> in the directory, so each directory level must
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be translated individually. No file name or type translations
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are required except for <tt>.MAIL</tt> to <tt>.MBX</tt>.
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The namestring syntax used for the to-wildnames is implementation-specific.
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<P><pre>
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(setf (logical-pathname-translations "prog")
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'(("RELEASED;*.*.*" "U:/sys/bin/my-prog/")
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("RELEASED;*;*.*.*" "U:/sys/bin/my-prog/*/")
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("EXPERIMENTAL;*.*.*"
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"U:/usr/Joe/development/prog/")
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("EXPERIMENTAL;DOCUMENTATION;*.*.*"
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"V:SYS$DISK:[JOE.DOC]")
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("EXPERIMENTAL;*;*.*.*"
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"U:/usr/Joe/development/prog/*/")
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("MAIL;**;*.MAIL" "V:SYS$DISK:[JOE.MAIL.PROG...]*.MBX")
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))
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</pre><P>
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Here are sample uses of logical host <tt>PROG</tt>. All return values
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are of course implementation-specific.
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<P><pre>
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(translate-logical-pathname "prog:mail;save;ideas.mail.3")
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=> #P"V:SYS$DISK:[JOE.MAIL.PROG.SAVE]IDEAS.MBX.3"
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(translate-logical-pathname "prog:experimental;spreadsheet.c")
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=> #P"U:/usr/Joe/development/prog/spreadsheet.c"
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</pre><P>
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<P>
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Suppose now that we have a program that uses three files logically named <tt>MAIN.LISP</tt>,
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<tt>AUXILIARY.LISP</tt>, and <tt>DOCUMENTATION.LISP</tt>. The following translations might be
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provided by a software supplier as examples.
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<P>
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For a UNIX file system with long file names:
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<P><pre>
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(setf (logical-pathname-translations "prog")
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'(("CODE;*.*.*" "/lib/prog/")))
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(translate-logical-pathname "prog:code;documentation.lisp")
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=> #P"/lib/prog/documentation.lisp"
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</pre><P>
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For a UNIX file system with 14-character file names, using <tt>.lisp</tt> as the type:
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<P><pre>
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(setf (logical-pathname-translations "prog")
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'(("CODE;DOCUMENTATION.*.*" "/lib/prog/docum.*")
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("CODE;*.*.*" "/lib/prog/")))
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(translate-logical-pathname "prog:code;documentation.lisp")
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=> #P"/lib/prog/docum.lisp"
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</pre><P>
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For a UNIX file system with 14-character file names, using <tt>.l</tt> as the type
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(the second translation shortens the compiled file type to <tt>.b</tt>):
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<P><pre>
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(setf (logical-pathname-translations "prog")
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`(("**;*.LISP.*" ,(logical-pathname "PROG:**;*.L.*"))
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(,(compile-file-pathname
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(logical-pathname "PROG:**;*.LISP.*"))
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,(logical-pathname "PROG:**;*.B.*"))
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("CODE;DOCUMENTATION.*.*" "/lib/prog/documentatio.*")
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("CODE;*.*.*" "/lib/prog/")))
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(translate-logical-pathname "prog:code;documentation.lisp")
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=> #P"/lib/prog/documentatio.l"
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</pre><P>
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<br><img align=bottom alt="change_end" src="gif/change_end.gif">
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<P>
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<BR> <HR><A NAME=tex2html4208 HREF="node213.html"><IMG ALIGN=BOTTOM ALT="next" SRC="icons/next_motif.gif"></A> <A NAME=tex2html4206 HREF="node208.html"><IMG ALIGN=BOTTOM ALT="up" SRC="icons/up_motif.gif"></A> <A NAME=tex2html4200 HREF="node211.html"><IMG ALIGN=BOTTOM ALT="previous" SRC="icons/previous_motif.gif"></A> <A NAME=tex2html4210 HREF="node1.html"><IMG ALIGN=BOTTOM ALT="contents" SRC="icons/contents_motif.gif"></A> <A NAME=tex2html4211 HREF="index.html"><IMG ALIGN=BOTTOM ALT="index" SRC="icons/index_motif.gif"></A> <BR>
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<B> Next:</B> <A NAME=tex2html4209 HREF="node213.html"> Discussion of Logical </A>
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<B>Up:</B> <A NAME=tex2html4207 HREF="node208.html"> Logical Pathnames</A>
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<B> Previous:</B> <A NAME=tex2html4201 HREF="node211.html"> Using Logical Pathnames</A>
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<HR> <P>
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<HR>
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<P><ADDRESS>
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AI.Repository@cs.cmu.edu
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</ADDRESS>
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</BODY>
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