Re: The Logical Pathname (Song)

Because the spec for merge-pathnames says it is in this case:

"merge-pathnames recognizes a logical pathname namestring when
default-pathname is a logical pathname, or when the namestring begins with the
name of a defined logical host followed by a colon. In the first of these two
cases, the host portion of the logical pathname namestring and its following
colon are optional."

-- 
Martin Simmons
LispWorks Ltd
http://www.lispworks.com/



>>>>> On Fri, 13 Mar 2026 21:52:15 +0100, Rainer Joswig (as joswig at lisp dot de) said:
> 
> why would "ASD.F" be parsed as a logical pathname?
> 
> > Am 13.03.2026 um 21:49 schrieb Martin Simmons <[email protected]>:
> > 
> > Because merge-pathnames merges the directory components rather than just
> > copying them.
> > 
> > The directory of "ASD.F" is (:absolute) so this overrides any directory in
> > default-pathname.
> > 
> > The reason that the directory of "ASD.F" has to be (:absolute) is because that
> > is the only way to represent a logical pathname namestring at the top level of
> > the hierarchy.
> > 
> > -- 
> > Martin Simmons
> > LispWorks Ltd
> > http://www.lispworks.com/
> > 
> > 
> > 
> >>>>>> On Fri, 13 Mar 2026 21:35:09 +0100, Rainer Joswig (as joswig at lisp dot de) said:
> >> 
> >> If it constructs a logical pathname using the host from the default-pathname, why would the directory from the default-pathname not be copied, too?
> >> 
> >>> Am 13.03.2026 um 19:35 schrieb Martin Simmons <[email protected]>:
> >>> 
> >>> It looks correct to me.  What are other CL's doing differently?
> >>> 
> >>> -- 
> >>> Martin Simmons
> >>> LispWorks Ltd
> >>> http://www.lispworks.com/
> >>> 
> >>> 
> >>> 
> >>>>>>>> On Wed, 11 Mar 2026 19:54:07 +0100, Marco Antoniotti (as marco dot antoniotti at unimib dot it) said:
> >>>> 
> >>>> Hi
> >>>> 
> >>>> I have the following
> >>>> 
> >>>> CL-USER 225 >
> >>>> (setf (logical-pathname-translations "LP")
> >>>> '(("**;*.*.*" "~/Projects/Foo/Bar/**/")))
> >>>> (("**;*.*.*" "~/Projects/Foo/Bar/**/"))
> >>>> 
> >>>> Then
> >>>> 
> >>>> CL-USER 256 > (merge-pathnames "ASD.F" "LP:FOO;QWE;")
> >>>> #P"LP:ASD.F.NEWEST"
> >>>> 
> >>>> Which is ... different from what other CL's do.
> >>>> 
> >>>> Any hermeneutics about this in LW?
> >>>> 
> >>>> Cheers
> >>>> MA
> >>>> 
> >>>> 
> >>>> -- 
> >>>> Marco Antoniotti, Professor, Director         tel. +39 - 02 64 48 79 01
> >>>> DISCo, University of Milan-Bicocca U14 2043   http://dcb.disco.unimib.it
> >>>> Viale Sarca 336
> >>>> I-20126 Milan (MI) ITALY
> >>>> 
> >>>> REGAINS: https://regains.disco.unimib.it/
> >>>> 
> >>> 
> >>> _______________________________________________
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> >> 
> >> 
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> > 
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> 
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