transformations of glob results

transformations of glob results

[Marc Chantreux]

hello people,

i wrote a glob result transformation that way:

    l=( /etc/sympa/*/robot.conf(:h:t) )
    l=( listmaster@$^l )
    print ${(j:,:)l}

but i really would like to know if there is a simple, readable way to
write it in one expression. the perl counterpart would be

    join ','
    , map 'listmaster@'.(split "/")[-2]
    , glob "/etc/*/robot.conf"

and i tried variations around

    print ${(j:,:)${(@)listmaster@${(^) /etc/sympa/*/robot.conf(:h:t) }}}

which

    * doesn't work
    * actually looks ugly

any help from a zsh poweruser ?

regards

-- 
Marc Chantreux (eiro on github and freenode)
http://eiro.github.com/
http://eiro.github.com/atom.xml
"Don't believe everything you read on the Internet"
    -- Abraham Lincoln

Re: transformations of glob results

[Mikael Magnusson]

On Wed, Sep 23, 2015 at 10:06 AM, Marc Chantreux <khatar@phear.org> wrote:
> hello people,
>
> i wrote a glob result transformation that way:
>
>     l=( /etc/sympa/*/robot.conf(:h:t) )
>     l=( listmaster@$^l )
>     print ${(j:,:)l}
>
> but i really would like to know if there is a simple, readable way to
> write it in one expression.

Not really, parameter expansion takes place before globbing so you
need to do the * separately before the other stuff. You can cheat and
do things with e:: but that is much slower in this case (and
technically the thing inside the :: is a separate expression too), or
use an anonymous function but all that really does is give you a free
local variable, (eg, () { print ${(j:,:):-listmaster@$^@}} }
/etc/sympa/*/robot.conf(:h:t) (not tested, may have typos) )

-- 
Mikael Magnusson

Re: transformations of glob results

[Marc Chantreux]

hello, 

> use an anonymous function but all that really does is give you a free
> local variable, (eg, () { print ${(j:,:):-listmaster@$^@}} }  

the thing is: you can't expand a list in an anymous function as it
communicates with pipes. i'm stuck there but the question was out of
curiosity.

thanks a lot for answering.


marc 


-- 
Marc Chantreux (eiro on github and freenode)
http://eiro.github.com/
http://eiro.github.com/atom.xml
"Don't believe everything you read on the Internet"
    -- Abraham Lincoln

Re: transformations of glob results

[Mikael Magnusson]

On Wed, Sep 23, 2015 at 4:41 PM, Marc Chantreux <khatar@phear.org> wrote:
> hello,
>
>> use an anonymous function but all that really does is give you a free
>> local variable, (eg, () { print ${(j:,:):-listmaster@$^@}} }
>
> the thing is: you can't expand a list in an anymous function as it
> communicates with pipes. i'm stuck there but the question was out of
> curiosity.

I'm not sure what you mean by this. There are no pipes in any of the
commands you or I wrote.

% () { print ${(j:,:):-listmaster@$^@} } /etc/*/.keep(:h:t)
listmaster@conf.d,listmaster@env.d,listmaster@modprobe.d,listmaster@opt,listmaster@xml

(as it happens, I did have a } too many before).

-- 
Mikael Magnusson

Re: transformations of glob results

[Bart Schaefer]

On Sep 23, 10:06am, Marc Chantreux wrote:
}
} and i tried variations around
} 
}     print ${(j:,:)${(@)listmaster@${(^) /etc/sympa/*/robot.conf(:h:t) }}}
} 
} which
} 
}     * doesn't work
}     * actually looks ugly
} 
} any help from a zsh poweruser ?

As Mikael said, this is difficult because globbing comes last.  You
can fork off the glob $( print -NR /etc/sympa/*/robot.conf(:h:t) )
and then split and rejoin that, but it'll be slower.