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References: <C2MRS2V8S953.3DWB49ORSAIY8@lamia> <CAN=4vMr_8j03P2oY0+9SLgBnMWMtGtrnUag7fte=18VnvUtRKg@mail.gmail.com>
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From: Bart Schaefer <schaefer@brasslantern.com>
Date: Sat, 9 May 2020 22:58:32 -0700
Message-ID: <CAH+w=7ayhozLXTYTE_3NEn9rKeR7-XrobddNpVFmB0xJEHBMGw@mail.gmail.com>
Subject: Re: [PATCH] expand '..n' to equivalent number of '..' segments in fixdir
To: Roman Perepelitsa <roman.perepelitsa@gmail.com>
Cc: Dian M Fay <dian.m.fay@gmail.com>, Zsh hackers list <zsh-workers@zsh.org>
Content-Type: text/plain; charset="UTF-8"

On Sat, May 9, 2020 at 9:44 PM Roman Perepelitsa
<roman.perepelitsa@gmail.com> wrote:
>
> On Sun, May 10, 2020 at 6:36 AM Dian M Fay <dian.m.fay@gmail.com> wrote:
> >
> > dian@lamia ~/work/zsh cd ..2
> > dian@lamia ~ cd ..123
> > dian@lamia /
>
> `..2` is a valid directory name. So it's a breaking change.

It can also be implemented as a shell function wrapper around "cd", so
it's not necessary to modify the C code.

Here's the basics, minus necessary handling for other cd options.

cd() {
  emulate -L zsh -o extendedglob -o histsubstpattern
  while [[ $1 = (#b)((#s)(|*/)..(<->)(/*|)(#e)) ]] do
    local dots=${(j:/:)${:-{1..${match[3]}}}//<->/..}
    set -- ${1:s,${~match[1]},${match[2]}${dots}${match[4]}}
  done
  echo builtin cd $*
}