From: "Nikolay Aleksandrovich Pavlov (ZyX)" <kp-pav@yandex.ru>
To: "vogt@linux.vnet.ibm.com" <vogt@linux.vnet.ibm.com>,
Zsh Users <zsh-users@zsh.org>
Subject: Re: Filtering argument lists (e.g. for grep)
Date: Mon, 07 Dec 2015 15:06:16 +0300 [thread overview]
Message-ID: <546281449489976@web12j.yandex.ru> (raw)
In-Reply-To: <531031449489824@web12j.yandex.ru>
07.12.2015, 15:03, "Nikolay Aleksandrovich Pavlov (ZyX)" <kp-pav@yandex.ru>:
> 07.12.2015, 14:51, "Dominik Vogt" <vogt@linux.vnet.ibm.com>:
>> On Mon, Dec 07, 2015 at 11:23:54AM +0000, Peter Stephenson wrote:
>>> On Mon, 7 Dec 2015 11:56:22 +0100
>>> Dominik Vogt <vogt@linux.vnet.ibm.com> wrote:
>>> > Maybe grep is a bad example because this can be done with the
>>> > --exclude= option. But could zsh help filtering the names
>>> > generated by globbing in a more general way so that I could write
>>> >
>>> > $ <foo> *
>>> >
>>> > and have zsh automagically filter the results of the * (not
>>> > everywhere; only for commands that have this feature enabled) so
>>> > that the non-matching names are not passed to the command in the
>>> > first place?
>>
>>> You could use a global alias, e.g.
>>>
>>> alias -g '@*'='*~(*\~|\#*|ChangeLog)'
>>
>> Yes, but then I'd need an alias for every potential pattern, e.g.
>> @*.s*, @**/*, @*.c.* etc.
>>
>>> Ig you want that first * to be something more flexible you can use a
>>> glob qualifier.
>>>
>>> gi () {
>>> [[ $REPLY != (*\~|\#*|ChangeLog) ]]
>>> }
>>>
>>> and use
>>>
>>> <foo> *(+gi)
>>
>> That sounds good, but is there a way to make that qualifier a
>> default for certain commands? As an alternative, is it possible
>> to access the command name from inside the qualifier function?
>>
>> function gi () {
>> if <command should be filtered>; then
>> [[ $REPLY != (*\~|\#*|ChangeLog) ]]
>> fi
>> }
>
> And there is another possibility: considering you want to do this thing with command `foo` you need to do the following:
>
> 1. Create an alias `foo='noglob foo'`.
> 2. Create a function `foo` like this:
>
> function foo()
> {
> local -a args=( "${@[@]}" )
> local -a new_args
> for (( I=2; I<= $#args; I++ )) ; do
> if [[ $args[I] != ${${args[I]}//[*?]} ]] ; then # If argument contains glob pattern
> args[I]+="(+gi)"
> new_args=( $~args[I] )
> args[I,I]=( $new_args )
> (( I += #new_args - 1 ))
> fi
> done
> command foo "${args[@]}"
> }
>
> . I.e. in place of leaving zsh to expand globs, expand it in your function “manually”, with necessary additions.
Though this variant is for one command. For multiple you need some adjustments:
1. `alias foo='noglob filterglob foo'`
2. Function is `filterglob`, starts with `local -r cmd="$1"; shift`, ends with `command "$cmd" "${args[@]}"`.
And I should not have used `I=2` (it initially meant to skip command) in any case, replace `I=2` with `I=1`.
>
>> Ciao
>>
>> Dominik ^_^ ^_^
>>
>> --
>>
>> Dominik Vogt
>> IBM Germany
next prev parent reply other threads:[~2015-12-07 12:17 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-12-07 10:56 Dominik Vogt
2015-12-07 11:18 ` Dominik Vogt
2015-12-07 11:23 ` Peter Stephenson
2015-12-07 11:39 ` Dominik Vogt
2015-12-07 11:56 ` Nikolay Aleksandrovich Pavlov (ZyX)
2015-12-07 12:03 ` Nikolay Aleksandrovich Pavlov (ZyX)
2015-12-07 12:06 ` Nikolay Aleksandrovich Pavlov (ZyX) [this message]
2015-12-07 12:58 ` Nikolay Aleksandrovich Pavlov (ZyX)
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