port_binary_distributable.tcl: Allow multiple ports to be queried in a single run

[ryandesign]

port_binary_distributable.tcl:

• Allow multiple ports to be queried in a single run
• Display the queried variants, if any, in verbose output

[raimue]

Overall, I think this functionality should really be moved to the port client to also benefit from the usual port list parsing instead of re-implementing something similar here.

[raimue]

Not sure whether I understand this change. Why would it be necessary to match the spaces explicitly now, but was not before?

[ryandesign]

Passing in a port name like youtube-dl was incorrectly being processed as a variant -dl. This change ensures that we are matching a + or - at the beginning of the entry only, not somewhere in the middle.

Before, this was guaranteed to be the case, because we were only calling split_variants on a list of strings that definitely began with a + or -. (Well, we were relying on the user to supply the variants in that format.) But now I am calling it with entries that could be a variant or could be a port, and I'm using the return value to determine which it was.

[ryandesign]

Overall, I think this functionality should really be moved to the port client to also benefit from the usual port list parsing instead of re-implementing something similar here.

Yeah, I have a bash shell function that makes it available to me as port distributable. It seems like it would make sense to have it in the port client, except that then changing the list of licenses would require a new release of MacPorts. Unless we moved the license data structures out into, say, the _resources directory of the ports tree, which might be reasonable to do.