Re: noglob does not call alias?

[ZyX <kp-pav@yandex.ru>]

13.03.14, 16:50, "Christoph (Stucki) von Stuckrad" <stucki@math.fu-berlin.de>":
> 
> Hi!
> 
> This looked like a mix of cases and
> I try to sort some out:
> 
> On Thu, 13 Mar 2014, ZyX wrote:
> 
> > > $ alias rm='nocorrect rm -i'
> ...
> > > rm: remove regular empty file `1'? n
> 
> The question is asked because of alias
> 
> > > $ noglob rm 1
> 
> aliases are expanded from the beginning of the LINE,
> not from the command itself, so anything in front
> of 'rm' seems to suppress the alias, like e.g.
> FOO=bar rm 1
> also does.
> 
> > > $ ls
> > > 2
> 
> So here's no question.
> 
> > > I think this is not what (new zsh) user expects.
> > > 
> > > How do I prevent this?
> 
> To prevent 'this', you need to make the
> Option '-i' permanent for all 'rm' calls,
> which is easier in functions, see at end.
> 
> > > Also 'noglob' does not respect RM_STAR_SILENT=off.
> > > 
> > > $ unsetopt RM_STAR_SILENT
> > > $ rm *
> > > 
> > > zsh: sure you want to delete all the files in ... [yn]? n
> 
> Well, it DID ask!
> 
> > > rm: missing operand
> > > Try `rm --help' for more information.
> 
> BUT you still had your alias defined, so you really called
> 
> noglob rm -i *
> 
> > > First I think when I said 'n'(no), it should not call
> > > 'rm' at all instead of calling it without any filename.
> 
> THIS is an interesting question!
> 
> Why did 'rm *', resulting in 'noglob rm -i *' still execute ???
> 
> I assume, the handling of 'denied' case of 'rm *' ends with
> a still existing parameter to 'rm', and thus runs the command
> instead of ignoring it completely?
> 
> > > But, anyway, continuing with my e-mail:
> > > 
> > > 
> > > $ noglob rm *
> > > rm: cannot remove `*': No such file or directory
> 
> This is, as it should be, and must not reply
> differently, lest being incompatible to the
> reaction of the other shell variants.
> 
> 
> 
> So I think, the only possibly strange case
> is the 'dangling -i without filename' created
> by the alias.
> 
> Such 'strange' effects made me switch completely
> from using 'aliases' to 'functions' instead!
> 
> For example defining this:
> 
> function rm {
>          nocorrect command rm -i "$@"

Corrections happen before function execution. Same for glob expansion. Putting nocorrect modifier here is a no-op, they have to be used from an alias. But putting -i in a function is correct and is the solution to the problem.

> 
> }
> 
> might be the 'secured rm' which you tried
> to create by aliases and which reacts as
> assumed on 'rm *', because the options
> are 'inside the function only' and do
> not interfere with your typed command.
> 
> Stucki
> 
> -- 
> Christoph von Stuckrad      * * |nickname |Mail <stucki@mi.fu-berlin.de> \
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