From: Peter Stephenson <p.stephenson@samsung.com>
To: zsh-workers@zsh.org
Subject: Re: Aliasing separators (Re: grammar triviality with '&&')
Date: Thu, 05 Mar 2015 17:40:11 +0000 [thread overview]
Message-ID: <20150305174011.0be5a31e@pwslap01u.europe.root.pri> (raw)
In-Reply-To: <150305090720.ZM8441@torch.brasslantern.com>
On Thu, 5 Mar 2015 09:07:20 -0800
Bart Schaefer <schaefer@brasslantern.com> wrote:
> Consider, with this patch in place:
>
> torch% alias -g '&&'=foo
> torch% set -x
> torch% true&&false
> +Src/zsh:3> true foofalse
> torch% &&bar
> +Src/zsh:4> foobar
> zsh: command not found: foobar
>
> That's CERTAINLY not the intended behavior
I would tend to agree with that, but that's largely because I have no
idea what the intended behaviour would be. It doesn't surprise me you
can get gobbledygook if you alias tokens to something with a different
behaviour. You get gobbledygook of a different kind if you alias
reserved words to something with a different behaviour. ('alias -g' has
always been a disaster waiting to happen, but I think the basic feature
is there without that.)
> Aliasing only of STRING tokens is exactly the right thing and this change
> is simply wrong. The doc only says "before parsing" as a shorthand instead
> of a long explaination about how the alias is replaced and then parsed all
> over again.
If you can produce an alternative patch describing the previous position
properly, go ahead. I don't think anyone is actually screaming to use
this change.
Personally, I don't see why allowing someone to alias \& but not &&
is logical; either you give users enough rope to hang themselves (and we
do), or you limit it to non-metacharacters (and we don't).
alias -g '*=*; print nonexistent-file'
ls *
pws
next prev parent reply other threads:[~2015-03-05 17:40 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <54F33934.2070607@eastlink.ca>
[not found] ` <13666281425228233@web7o.yandex.ru>
[not found] ` <54F345D3.9010204@eastlink.ca>
[not found] ` <D0509295-7DA9-4F18-9E3D-D50C0A756998@larryv.me>
[not found] ` <20150302022754.GA7449@xvii.vinc17.org>
[not found] ` <CABx2=D8efL3X2tfB+_+VweY2yye6EhaMNbJa3b3jJeVMp=7gaQ@mail.gmail.com>
[not found] ` <20150302104619.GC6869@xvii.vinc17.org>
[not found] ` <20150302110610.2e2c7e86@pwslap01u.europe.root.pri>
[not found] ` <CAH+w=7YoHjN85hqOZVywOfYGZqvU74vZrbE84Ln+V2HQi-6nSA@mail.gmail.com>
[not found] ` <20150304144756.GA27231@ypig.lip.ens-lyon.fr>
2015-03-04 15:18 ` grammar triviality with '&&' Peter Stephenson
2015-03-04 21:13 ` Daniel Shahaf
2015-03-04 22:05 ` Mikael Magnusson
2015-03-05 9:46 ` Peter Stephenson
[not found] ` <150304175112.ZM19818@torch.brasslantern.com>
[not found] ` <20150305100638.55631238@pwslap01u.europe.root.pri>
2015-03-05 17:07 ` Aliasing separators (Re: grammar triviality with '&&') Bart Schaefer
2015-03-05 17:40 ` Peter Stephenson [this message]
2015-03-06 1:42 ` Bart Schaefer
2015-03-06 4:13 ` Mikael Magnusson
2015-03-06 16:43 ` Vincent Lefevre
2015-03-06 9:40 ` Peter Stephenson
2015-03-06 19:26 ` Bart Schaefer
2015-03-07 15:52 ` Peter Stephenson
2015-03-07 17:18 ` Ray Andrews
2015-03-07 21:10 ` Bart Schaefer
2015-03-09 11:46 ` Vincent Lefevre
2015-03-09 16:33 ` Peter Stephenson
2015-03-09 17:03 ` Bart Schaefer
2015-03-09 17:39 ` Peter Stephenson
2015-03-09 17:47 ` Ray Andrews
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