bug#67930: 29.1; emacs 29.1 follows symlinks when a grep result is selected

[DE BACKER Jurgen (EXT)]

> -----Original Message-----
> From: Eli Zaretskii <eliz@gnu.org>
> Sent: Saturday, December 23, 2023 12:11 PM
> To: DE BACKER Jurgen (EXT) <jurgen.de-backer.ext@eurocontrol.int>
> Cc: 67930@debbugs.gnu.org
> Subject: Re: bug#67930: 29.1; emacs 29.1 follows symlinks when a grep result
> is selected
>
> > From: "DE BACKER Jurgen (EXT)" <jurgen.de-backer.ext@eurocontrol.int>
> > CC: "67930@debbugs.gnu.org" <67930@debbugs.gnu.org>
> > Date: Fri, 22 Dec 2023 16:20:42 +0000
> >
> > > From: Eli Zaretskii <eliz@gnu.org>
> > > Sent: Wednesday, December 20, 2023 7:47 PM
> > > To: DE BACKER Jurgen (EXT) <jurgen.de-backer.ext@eurocontrol.int>
> > > Cc: 67930@debbugs.gnu.org
> > > Subject: Re: bug#67930: 29.1; emacs 29.1 follows symlinks when a
> > > grep result is selected
> > >
> > > Thanks, but I don't think this is a matter of user preferences.  We
> > > replaced expand-file-name there by file-truename because in some
> > > cases the former doesn't work: it expands to a file that doesn't
> > > exist.  See bug#8035, where such cases are presented.  We cannot ask
> > > the user to set or reset this option each time they need to work with
> these or those file names.
> > >
> > > So I don't think the fix you propose is the right one.  I think we
> > > need to use expand-file-name where it works, and file-truename where
> > > expand-file- name doesn't work.  Or maybe just try expand-file-name
> > > first, and if that produces a file name that fails file-exists-p, try 
> > > file-
> truename.
> > >
> > > Would you like to propose and test a patch along these lines?
> >
> > Hi Eli,
> >
> > Please find attached a patch that does this: first we  try to expand
> > the file name with expand-file-name and if this fails, retry with file-
> truename.
>
> Thanks.  I have a couple of minor comments:
>
> > # In emacs 29.1, when clicking on a file link in the *grep* results
> > buffer, # symlinks are resolved to the actual filename(s). In some cases 
> > this
> is not preferable.
> > #
> > # This patch -1 will first use the previous behaviour (using expand-file-
> name) to resolve a (relative) filename
> > #            -2 if this fails (i.e. the result is not an existing file), we 
> > try with the
> new behaviour
> > #                which uses function file-truename.
> > #
> > # In emacs 29.1 expand-file-name was replaced by file-truename to solve
> bug #8035,
> > #   because in specific cases expand-file-name returned a wrong/non
> existing file.
> > # Unlike expand-file-name, file-truename follows symlinks.
>
> Could you please reformat this log message using our style?  The details can
> be found in the file CONTRIBUTE in the Emacs Git repository.
>
> > --- lisp/progmodes/compile.el.orig  2023-02-11 12:06:09.000000000 +0000
> > +++ lisp/progmodes/compile.el       2023-12-21 17:22:34.000688000 +0000
> > @@ -3108,7 +3108,7 @@
> >          (spec-dir (if directory
> >                        (expand-file-name directory)
> >                      default-directory))
> > -        buffer thisdir fmts name)
> > +        buffer thisdir fmts expandedname name)
> >      (if (and filename
> >               (file-name-absolute-p filename))
> >          ;; The file name is absolute.  Use its explicit directory as
> > @@ -3122,8 +3122,10 @@
> >              fmts formats)
> >        ;; For each directory, try each format string.
> >        (while (and fmts (null buffer))
> > -        (setq name (file-truename
> > -                    (file-name-concat thisdir (format (car fmts) 
> > filename)))
> > +        (setq expandedname (expand-file-name (format (car fmts) filename)
> thisdir)
> > +              name (if (file-exists-p expandedname) ;; See bug #8035 
> > expand-
> file-name fails in specific cases
> > +                       expandedname
> > +                     (file-truename (file-name-concat thisdir (format
> > + (car fmts) filename))))
> >                buffer (and (file-exists-p name)
> >                            (find-file-noselect name))
> >                fmts (cdr fmts)))
>
> Your changes repeat the same pattern several times, so I think it would be
> better to factor out this code into a separate function, and then call that
> function in those places.  Would you like to rewrite the patch along these
> lines?
>
> Thanks again for working on this.

Hi,

Please find attached an updated patch which addresses your remarks.

All the best,
Jurgen
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emacs-29.1_expand_file_names.patch
Description: emacs-29.1_expand_file_names.patch