bug#50852: [PATCH] Fix search of the look program.

[Eli Zaretskii]

> From: Lars Ingebrigtsen <larsi@gnus.org>
> Cc: Stefan Kangas <stefan@marxist.se>,  andremegafone@gmail.com,
>   50852@debbugs.gnu.org
> Date: Tue, 28 Sep 2021 08:11:18 +0200
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > In this case, why not simply have the value as "look" with no leading
> > directories?  If the program is installed, it will be found when it's
> > invoked, and if it isn't installed, the user gets an error message at
> > that time.
> 
> That's a good point.  And the ispell-look-p variable is itself rather
> odd -- why have both ispell-look-command and that variable (with a
> non-standard name)?

Right.  The existence of "look" should IMO be tested as part of
ispell-lookup-words, not when the package loads.  Then the command
could decide whether to use "look" or Grep at that time, and the need
for the ispell-look-p variable would disappear.