pws-23: RE: _match and auto menu with multipath again

["Andrej Borsenkow" <borsenkow.msk@xxxxxx>]

>
> Does any of these do what you want? Note that setting `match_insert=unambig'
> may sometimes remove a short pattern if enough components further up
> the path were expanded. This is a bit ugly, yes, but I can't think of
> an easy way to find out where that precious pattern is which one might
> want to have preserved.
>


Thinking more and more about it: what is the reason for _match to automatically
start menu completion at all (apart from compatibility with old zsh, that can be
preserved with configuration key). Think about it:

1. We complete /u/l/s/z/f -> /usr/local/share/zsh/functions
This is actually the same as if we completed /u*/l*/s*/z*/f* - and is
interpreted and implemented this way. What happens is, that unambiguous prefix
is replaced and first ambiguous part is replaced with the largest common prefix;
remaining parts retain there (implicit) glob pattern. That is, we get something
like

/usr/local/s/z*/f*
share status ...

how does it differ from

2. We complete /u/l/s/z/f*s -> /usr/local/share/zsh/functions ?
In no way, except, that we know better some patterns (more than only initial
character) and thus are able to reduce possible matches. Note, that patterns are
often longer than most common prefix - typing /u/l/lib*X* will typically leave
me with just 'lib' prefix.

So, I think, that either match_insert should be changed to always insert prefix
(irrespectively of length) or we need additional config key to force it.

And about cutrrent behaviour:

compconf correct_accept='2n'
compconf match_original='yes'
compconf completer='_complete:_match'
compconf dumpfile='/home/bor/.zcompdump'
compconf path_cursor='yes'
compconf match_insert='unambig'
compconf correct_prompt='correct to:'
bor@itsrm2:~%> l /u/l/lib*X*<TAB>
bor@itsrm2:~%> l /usr/lib/lib*X*
lib/     lib64s/         ^ cursor here

That is correct and is what I expected. But simply pressing TAB once more
results in

bor@itsrm2:~%> l /usr/lib/libX11.a
lib/     lib64s/

While if I press any cursor movement key and then TAB I get

bor@itsrm2:~%> l /usr/lib/lib*X*
lib/     lib64s/          ^ cursor here (after cursor-right)
bor@itsrm2:~%> l /usr/lib/libX11.a
libX11.a@           libXaw.so.6.1@      libXmSni.so.3.0@    libXpm.so.3.4@
libX11.so@          libXdUtils.so.3.1@  libXmu.a@           libXpm.so.4.6@
.................... (long list),
or if I explicitly enter '6'

bor@itsrm2:~%> l /usr/lib/lib*X*
lib/     lib64s/         ^ cursor here
bor@itsrm2:~%> l /usr/lib6/lib*X*
lib/     lib64s/          ^ cursor here and TAB
bor@itsrm2:~%> l /usr/lib64s/libX11.a
libX11.a@          libXaw.so.6.1@     libXmu.so@         libXpm.so@
libX11.so@         libXdmcp.a@        libXmu.so.6.0@     libXpm.so.3.4@
........................

Looks like a problem with list redisplay. Completion code thinks, it has still
old valid list. And this also illustrates my point - in this case I do not want
menu completion - I just want list to be dislpayed. But, unfortunatley,
length(lib) < length(lib*X*) :-(

/andrej

Just in case:
6731, 6732 applied