RE: PATCH: Re: undo in menu selection broken

[Sven Wischnowsky <wischnow@informatik.hu-berlin.de>]

Andrej Borsenkow wrote:

> > What this patch does *not* do is fix the behaviour of a-a-i-n-h when
> > there is no match. I was thinking about making it just show some
> > message and let undo bring you back. Or maybe let it stay in the
> > selection it currently is in and show some message. But:
> 
> I think, this is more general problem. I do not like what currently
> happens, when no match is found.
> 
> 1. There is hardly any visual feedback (well, with verbose style and
> group names you get sort of). Good ole compctl had an option to display
> a message in this case ... I do not recall something like this in new
> completion system. Is there any style I can set to simply display "No
> matches found" in this case?
> 
> 2. Something very funny happens if there is no matches and you hit TAB
> several times. The worst is, that line is erased. This hapens in menu
> selection and in normal completion as well. Consider:

This was only a problem with _oldlist. Should be fixed by the patch below.

> > 1) I wouldn't like to hard-wire this message, but adding a parameter
> >    just for this looks kinda weird.
> >    Or maybe just add a ZLS_COLOURS capability for it.
> 
> See above. Style for general use is really welcome (not only for this
> one widget)

Maybe you should just have had a look at the docs after I wrote:

> > 2) Setting the format style for the warnings tag to a value without a
> >    `%d' makes it add the descriptions of the things it tried as
> >    matches which gives a much better output than using `%d'. But with
> >    this, there's never a completion without matches and a-a-i-n-h
> >    happily starts completing the descriptions. So maybe a-a-i-n-h
> >    in menu-selection should set some parameter so that the shell code
> >    can find that out. Even better would be to change the complete
> >    module so that other modules like complist can put things into
> >    $compstate.
> 
> Ahem ... sorry, but I simply do not understand it :-)) I'm speaking from
> a user's point if view ...

Currently you can use:

  zstyle ':completion:*:warnings' format 'No matches for: %d'

which gives you only the explanation. Or you can use:

  zstyle ':completion:*:warnings' format 'No matches for:'

(note: no `%d') which gives you that explanation and below that the
list of descriptions for the things it tried to complete.

So, there is currently no way to make it *not* display the
descriptions. Hm, maybe, the no-`%d' is used seldom enough to allow us 
to make the `add descriptions as "matches"' be controlled by another
style.

But it's cheap, showing those descriptions. All the work for it is
already done.

Bye
 Sven

Index: Completion/Core/_oldlist
===================================================================
RCS file: /cvsroot/zsh/zsh/Completion/Core/_oldlist,v
retrieving revision 1.6
diff -u -r1.6 _oldlist
--- Completion/Core/_oldlist	2000/05/18 08:59:29	1.6
+++ Completion/Core/_oldlist	2000/06/28 08:56:56
@@ -1,6 +1,6 @@
 #autoload
 
-[[ _matcher_num -gt 1 ]] && return 1
+[[ _matcher_num -gt 1 || $_lastcomp[nmatches] -eq 0 ]] && return 1
 
 local list
 

--
Sven Wischnowsky                         wischnow@informatik.hu-berlin.de