MacPorts GUI - mportopen invocation for variants

[Joshua Root]

On 2010-7-19 23:51 , bill georgitzikis wrote:
> Hello everyone, i am Vasilis Georgitzikis, and I am working on the
> MacPorts GUI and Framework for this year's GSoC, but i have stumbled
> upon something that i can't seem to get past. I am trying to extend the
> macports framework to support variants selection/installation, and i
> have this tcl command when testing it with ncdu and the universal variant:
> 
> set portHandle [mportopen 
> file:///opt/local/var/macports/sources/rsync.macports.org/release/ports/sysutils/ncdu
> <http://rsync.macports.org/release/ports/sysutils/ncdu>    +universal];
> mportexec  $portHandle install; mportclose $portHandle
> 
> Up untill now, nothing was passed as an option and variant, since the
> framework didn't support either. I understand that in order to pass a
> variant, i need to pass an option as well, but looking at the macports
> code, i can't understand what option i need to pass when i simply want
> to pass a variant. Also, should i pass the variant with the +/-, or does
> mpopen simply expects the name? Please keep in mind that i am currently
> working on 1.8.2.

If you don't want to set any options, pass an empty list. The variations
arg is a list formatted as expected by 'array set', i.e. it represents a
mapping of variant names to either + or -. So an example would be:

{foo + bar - baz +}

- Josh