replaced_by multiple ports?

[Leo Singer]

On Dec 11, 2012, at 1:21 PM, Ryan Schmidt <ryandesign at macports.org> wrote:

> On Dec 11, 2012, at 14:59, Jeremy Lavergne wrote:
> 
>>> I would like to split an existing port (healpix) into two or more new ports (healpix-c, healpix-cxx). Is there a way to accomplish this with replaced_by, or are there any examples of ports for which something similar has happened in the past?
>> 
>> I believe replaced-by only handles a one-to-one replacement.
> 
> Right.
> 
>> I'd recommend making healpix a virtual package (no real contents, just one file in to place into a ${prefix}/share/doc/${name}/) that depends on both healpix-c and healpix-cxx. 
> 
> Yes, but you'll have to add the "deactivate hack" to the virtual port (or meta port) to prevent activation failures on upgrades.
> 
>> You could add a `notes` message indicating healpix no longer does anything: users can set healpix-c[xx] as requested and then uninstall healpix.
> 
> Yes, and any ports that depend on healpix should be updated to depend on the new port(s) as appropriate.


Could I have healpix depend on healpix-c and healpix-cxx?

The healpix-* ports would share distfiles and some build arguments. What I have in my working copy right now is a modified version of the healpix Portfile (see attached) that contains healpix-c and healpix-cxx subports, a little reminiscent of the Python ports. Is this setup reasonable? What is the simplest way to make the main port a virtual port?

Leo

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