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
What I came up with is:
$ port info --subports --line graphviz | tr , '\n'
graphviz-gui
gvedit
I can file a feature request for this, just wanted to check that there wasn't
another easy way to do this that I was overlooking.
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