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* glob qualifier on intermediate directory / no symbolic links
@ 2019-07-10 13:37 Vincent Lefevre
  2019-07-10 13:58 ` Pier Paolo Grassi
  0 siblings, 1 reply; 6+ messages in thread
From: Vincent Lefevre @ 2019-07-10 13:37 UTC (permalink / raw)
  To: zsh-users

Is there a way to use a glob qualifier on an intermediate directory?
At least, avoid symbolic links from being followed.

For instance, with:

% mkdir -p dir/dir2
% ln -s dir foo
% touch {dir,dir/dir2}/file

With recursive globbing, one can choose whether or not to follow
symbolic links:

% echo **/file
dir/dir2/file dir/file

% echo ***/file
dir/dir2/file dir/file foo/dir2/file foo/file

Without recursive globbing, * matches symbolic links:

% echo */file
dir/file foo/file

But what if I don't want to match symbolic links?

At the end of a pattern, (^@) can be used:

% echo *
dir foo

% echo *(^@)
dir

but not inside a pattern:

% echo *(^@)/file
zsh: no matches found: *(^@)/file

With EXTENDED_GLOB, I get both, like */file, because (...) is used
here for grouping, not for a glob qualifier.

% setopt EXTENDED_GLOB
% echo *(^@)/file
dir/file foo/file

I would have expected the following to work, but doesn't.

% echo (*(^@))/file
dir/file foo/file

The zshexpn(1) man page says:

    Glob Qualifiers
        Patterns used for filename generation may end in a list of
        qualifiers enclosed in parentheses. [...]

What "patterns" means here is not clear. Above, one has

    (...)  Matches the enclosed pattern. [...]
                                ^^^^^^^

but it seems that this is not a pattern that can have a glob qualifier.
I assume that except for the grouping exception and recursive globbing,
this is because patterns are mainly string operations until the list of
files before considering glob qualifiers is obtained.

I'm wondering why the following is not accepted:

% echo (*/)file
zsh: bad pattern: (*/)file

I think that (pat/) without a following # should match a single
occurrence of pat/ (without following symbolic links, contrary
to the case without parentheses).

-- 
Vincent Lefèvre <vincent@vinc17.net> - Web: <https://www.vinc17.net/>
100% accessible validated (X)HTML - Blog: <https://www.vinc17.net/blog/>
Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)

^ permalink raw reply	[flat|nested] 6+ messages in thread

* Re: glob qualifier on intermediate directory / no symbolic links
  2019-07-10 13:37 glob qualifier on intermediate directory / no symbolic links Vincent Lefevre
@ 2019-07-10 13:58 ` Pier Paolo Grassi
  2019-07-10 16:26   ` Mikael Magnusson
                     ` (3 more replies)
  0 siblings, 4 replies; 6+ messages in thread
From: Pier Paolo Grassi @ 2019-07-10 13:58 UTC (permalink / raw)
  To: Zsh-Users List

[-- Attachment #1: Type: text/plain, Size: 2664 bytes --]

you can do something like this:

setopt NULL_GLOB
typeset -a arr=(*(^@))
ls ${^arr}/file

but I'm curious if there is any solution that doesn't require using an
intermediate array

Pier Paolo Grassi
linkedin: https://www.linkedin.com/in/pier-paolo-grassi-19300217
founder: https://www.meetup.com/it-IT/Machine-Learning-TO


Il giorno mer 10 lug 2019 alle ore 15:38 Vincent Lefevre <vincent@vinc17.net>
ha scritto:

> Is there a way to use a glob qualifier on an intermediate directory?
> At least, avoid symbolic links from being followed.
>
> For instance, with:
>
> % mkdir -p dir/dir2
> % ln -s dir foo
> % touch {dir,dir/dir2}/file
>
> With recursive globbing, one can choose whether or not to follow
> symbolic links:
>
> % echo **/file
> dir/dir2/file dir/file
>
> % echo ***/file
> dir/dir2/file dir/file foo/dir2/file foo/file
>
> Without recursive globbing, * matches symbolic links:
>
> % echo */file
> dir/file foo/file
>
> But what if I don't want to match symbolic links?
>
> At the end of a pattern, (^@) can be used:
>
> % echo *
> dir foo
>
> % echo *(^@)
> dir
>
> but not inside a pattern:
>
> % echo *(^@)/file
> zsh: no matches found: *(^@)/file
>
> With EXTENDED_GLOB, I get both, like */file, because (...) is used
> here for grouping, not for a glob qualifier.
>
> % setopt EXTENDED_GLOB
> % echo *(^@)/file
> dir/file foo/file
>
> I would have expected the following to work, but doesn't.
>
> % echo (*(^@))/file
> dir/file foo/file
>
> The zshexpn(1) man page says:
>
>     Glob Qualifiers
>         Patterns used for filename generation may end in a list of
>         qualifiers enclosed in parentheses. [...]
>
> What "patterns" means here is not clear. Above, one has
>
>     (...)  Matches the enclosed pattern. [...]
>                                 ^^^^^^^
>
> but it seems that this is not a pattern that can have a glob qualifier.
> I assume that except for the grouping exception and recursive globbing,
> this is because patterns are mainly string operations until the list of
> files before considering glob qualifiers is obtained.
>
> I'm wondering why the following is not accepted:
>
> % echo (*/)file
> zsh: bad pattern: (*/)file
>
> I think that (pat/) without a following # should match a single
> occurrence of pat/ (without following symbolic links, contrary
> to the case without parentheses).
>
> --
> Vincent Lefèvre <vincent@vinc17.net> - Web: <https://www.vinc17.net/>
> 100% accessible validated (X)HTML - Blog: <https://www.vinc17.net/blog/>
> Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)
>

^ permalink raw reply	[flat|nested] 6+ messages in thread

* Re: glob qualifier on intermediate directory / no symbolic links
  2019-07-10 13:58 ` Pier Paolo Grassi
@ 2019-07-10 16:26   ` Mikael Magnusson
  2019-07-12  8:20   ` Vincent Lefevre
                     ` (2 subsequent siblings)
  3 siblings, 0 replies; 6+ messages in thread
From: Mikael Magnusson @ 2019-07-10 16:26 UTC (permalink / raw)
  To: Pier Paolo Grassi; +Cc: Zsh-Users List

On 7/10/19, Pier Paolo Grassi <pierpaolog@gmail.com> wrote:
> you can do something like this:
>
> setopt NULL_GLOB
> typeset -a arr=(*(^@))
> ls ${^arr}/file
>
> but I'm curious if there is any solution that doesn't require using an
> intermediate array

There isn't.

-- 
Mikael Magnusson

^ permalink raw reply	[flat|nested] 6+ messages in thread

* Re: glob qualifier on intermediate directory / no symbolic links
  2019-07-10 13:58 ` Pier Paolo Grassi
  2019-07-10 16:26   ` Mikael Magnusson
@ 2019-07-12  8:20   ` Vincent Lefevre
       [not found]   ` <20190712082023.GA3983__17556.0249060922$1562919714$gmane$org@zira.vinc17.org>
       [not found]   ` <CAHYJk3QJO8XGhJoKVFWugV6pnMDzPs8C=NmYPWQheBUooexv0w__28304.959919636$1562776081$gmane$org@mail.gmail.com>
  3 siblings, 0 replies; 6+ messages in thread
From: Vincent Lefevre @ 2019-07-12  8:20 UTC (permalink / raw)
  To: zsh-users

On 2019-07-10 15:58:05 +0200, Pier Paolo Grassi wrote:
> you can do something like this:
> 
> setopt NULL_GLOB
> typeset -a arr=(*(^@))
> ls ${^arr}/file
> 
> but I'm curious if there is any solution that doesn't require using
> an intermediate array

This isn't even correct as there may be directories without the file
inside them.

Moreover, I was looking for something short to type, and possibly
compatible with completion widgets, such as expand-or-complete.
Otherwise, there would be a solution to use a function that does
what I want, of the form $(dirfile 'dirpattern' 'filepattern')
but this is not satisfactory.

-- 
Vincent Lefèvre <vincent@vinc17.net> - Web: <https://www.vinc17.net/>
100% accessible validated (X)HTML - Blog: <https://www.vinc17.net/blog/>
Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)

^ permalink raw reply	[flat|nested] 6+ messages in thread

* Re: glob qualifier on intermediate directory / no symbolic links
       [not found]   ` <20190712082023.GA3983__17556.0249060922$1562919714$gmane$org@zira.vinc17.org>
@ 2019-07-21 21:40     ` Stephane Chazelas
  0 siblings, 0 replies; 6+ messages in thread
From: Stephane Chazelas @ 2019-07-21 21:40 UTC (permalink / raw)
  To: zsh-users

2019-07-12 10:20:23 +0200, Vincent Lefevre:
> On 2019-07-10 15:58:05 +0200, Pier Paolo Grassi wrote:
> > you can do something like this:
> > 
> > setopt NULL_GLOB
> > typeset -a arr=(*(^@))
> > ls ${^arr}/file
> > 
> > but I'm curious if there is any solution that doesn't require using
> > an intermediate array
> 
> This isn't even correct as there may be directories without the file
> inside them.
> 
> Moreover, I was looking for something short to type, and possibly
> compatible with completion widgets, such as expand-or-complete.
> Otherwise, there would be a solution to use a function that does
> what I want, of the form $(dirfile 'dirpattern' 'filepattern')
> but this is not satisfactory.
[...]

I raised a similar query on the zsh-workers mailing list at
https://www.zsh.org/mla/workers/2019/msg00501.html
There was no feedback though.

-- 
Stephane

^ permalink raw reply	[flat|nested] 6+ messages in thread

* Re: glob qualifier on intermediate directory / no symbolic links
       [not found]   ` <CAHYJk3QJO8XGhJoKVFWugV6pnMDzPs8C=NmYPWQheBUooexv0w__28304.959919636$1562776081$gmane$org@mail.gmail.com>
@ 2019-07-21 21:56     ` Stephane Chazelas
  0 siblings, 0 replies; 6+ messages in thread
From: Stephane Chazelas @ 2019-07-21 21:56 UTC (permalink / raw)
  To: Mikael Magnusson; +Cc: Pier Paolo Grassi, Zsh-Users List

2019-07-10 18:26:42 +0200, Mikael Magnusson:
> On 7/10/19, Pier Paolo Grassi <pierpaolog@gmail.com> wrote:
> > you can do something like this:
> >
> > setopt NULL_GLOB
> > typeset -a arr=(*(^@))
> > ls ${^arr}/file
> >
> > but I'm curious if there is any solution that doesn't require using an
> > intermediate array
> 
> There isn't.
[...]

Well, there is

ls -d -- (*/)##file~*/*/*

(a corrected version of the one I suggested in my related
zsh-workers thread at
https://www.zsh.org/mla/workers/2019/msg00501.html).

But I wouldn't call it "a solution".

That works because (*/)## doesn't follow symlinks, but obviously
that means crawling the whole directory tree while we only care
for depth 1.

-- 
Stephane

^ permalink raw reply	[flat|nested] 6+ messages in thread

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Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2019-07-10 13:37 glob qualifier on intermediate directory / no symbolic links Vincent Lefevre
2019-07-10 13:58 ` Pier Paolo Grassi
2019-07-10 16:26   ` Mikael Magnusson
2019-07-12  8:20   ` Vincent Lefevre
     [not found]   ` <20190712082023.GA3983__17556.0249060922$1562919714$gmane$org@zira.vinc17.org>
2019-07-21 21:40     ` Stephane Chazelas
     [not found]   ` <CAHYJk3QJO8XGhJoKVFWugV6pnMDzPs8C=NmYPWQheBUooexv0w__28304.959919636$1562776081$gmane$org@mail.gmail.com>
2019-07-21 21:56     ` Stephane Chazelas

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