subportof pseudoport

[Rainer Müller]

On 2012-11-24 06:40, Ryan Schmidt wrote:
> It feels like there should be a "subportof" pseudoport, but there doesn't seem to be:
> 
> 
> $ port echo subportof:graphviz
> Can't map the URL 'subportof:graphviz' to a port description file ("Can't parse url subportof:graphviz").
> Please verify that the directory and portfile syntax are correct.
> Error: Can't open URL 'subportof:graphviz' as a port
> Error: Improper expression syntax while processing parameters

https://trac.macports.org/changeset/100059

This implements a new pseudo-port subportof: that returns the subports
of the given port name. Additionally, it adds subport:/subports: that
returns the ports that have a subport matching the given expression.

For example:

  $ port echo subportof:graphviz
  graphviz-gui
  gvedit

As you can see, subportof: gives the same information as returned by
'port info --subports'.

  $ port echo subports:graphviz-gui
  graphviz
  graphviz-devel

  $ port info --name --subports subports:graphviz-gui
  subports: graphviz-gui, gvedit
  name: graphviz
  --
  subports: graphviz-gui-devel, gvedit-devel
  name: graphviz-devel

Here, both graphviz and graphviz-devel offer a subport which matches the
string graphviz-gui. This is similar to the way variant:/variants: works
for getting the ports providing the given variant.

Rainer