On Fri, Jul 15, 2022 at 12:32:30AM +0200, Stephen Berman wrote:
> On Wed, 13 Jul 2022 12:51:31 -0500 Archmux <archmux@stemux.com> wrote:
> 
> > Dear Emacs Help,
> >
> > I need to filter the results of `find-name-dired' programmatically.
> >
> > I am attempting it with this command-prototype:
> >
> > """""
> >
> > (with-current-buffer (find-name-dired "~/Musica/" "*.flac")
> >   (occur "Hunter")
> > )
> >
> > """""
> >
> > It returns:
> >
> > """""
> >
> > (wrong-type-argument stringp (":%s"))
> >
> > set-buffer((":%s"))
> >
> > ...
> >
> > """""
> >
> >
> > 1. How do I troubleshoot/discover the issue causing, `set-buffer((":%s"))' ?
> 
> One way is to look at the source of `find-name-dired' and you'll see it
> contains no "(:%s)" but it calls `find-dired', which also contains no
> "(:%s)" but it calls `find-dired-with-command', which indeed ends with
> `(setq mode-line-process '(":%s"))', which means `(":%s")' is the return
> value, and that's causing the error.

Another useful tool for such things is setting up debug on error, by
doing "M-x toggle-debug-on-error". This will lead you to the spot in
the source where the error was caught.

Cheers
-- 
t