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Re: Filtering argument lists (e.g. for grep)
07.12.2015, 14:51, "Dominik Vogt" <vogt@xxxxxxxxxxxxxxxxxx>:
> 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@xxxxxxxxxxxxxxxxxx> 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.
>
> Ciao
>
> Dominik ^_^ ^_^
>
> --
>
> Dominik Vogt
> IBM Germany
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