Puppet users - May 2011 - PC EU feedback: unpack array variables in string interpolation

http://projects.puppetlabs.com/issues/7598

If your goal is this (pseudo-code):

    @file { "host_one" }
    @file { "host_two" }

You should be able to say this:

    $array = [ "one", "two" ]
    @file { "host_$array" }

Instead of this:

    @file { "host_one", "host_two" }

Please comment on the ticket or reply here, whichever you prefer.

Thanks!

r

P.S. This is in response to feedback from my "Improving the Puppet
DSL" session at Puppet Camp EU, 2011.  This ticket isn''t a promise
we
will take action, but we could very much like comment and discussion
from you good people.

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What should this do?

     $array = [ "one", "two" ]
     $greeting = [ "hello", "howdy" ]
     @file { "host_$array$greeting" }

or this?

     $array = [ "one", "two" ]
     @file { "$array_blah" }

seems like we would need delimiters

     "host_${array}_${greeting}"

and some form of expansion control.
Should it expand zipper-wise or combinatorially?

Probably all of that belongs in functions,
not in the resource or string syntax.

-- 
vagn

On 05/20/2011 04:15 PM, Randall Hansen wrote:
> http://projects.puppetlabs.com/issues/7598
>
> If your goal is this (pseudo-code):
>
>      @file { "host_one" }
>      @file { "host_two" }
>
> You should be able to say this:
>
>      $array = [ "one", "two" ]
>      @file { "host_$array" }
>
> Instead of this:
>
>      @file { "host_one", "host_two" }
>
> Please comment on the ticket or reply here, whichever you prefer.
>
> Thanks!
>
> r
>
> P.S. This is in response to feedback from my "Improving the Puppet
> DSL" session at Puppet Camp EU, 2011.  This ticket isn''t a
promise we
> will take action, but we could very much like comment and discussion
> from you good people.
>
>    
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On May 24, 8:54 pm, vagn scott <vagnsc...@gmail.com>
wrote:
> What should this do?
>
>      $array = [ "one", "two" ]
>      $greeting = [ "hello", "howdy" ]
>      @file { "host_$array$greeting" }
>
> or this?
>
>      $array = [ "one", "two" ]
>      @file { "$array_blah" }
>
> seems like we would need delimiters
>
>      "host_${array}_${greeting}"
>
> and some form of expansion control.
> Should it expand zipper-wise or combinatorially?
>
> Probably all of that belongs in functions,
> not in the resource or string syntax.
+1

Moreover, consider the juxtaposition of this proposal with those that
seek to make the language less idiosyncratic and "magical".  This one
proposes a move in the opposite direction.


John

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