ros-infrastructure/rosdep — pull request #304 by NikolausDemmel (2014-02-25 18:53:42+00:00)
Title: Implement support for options with homebrew.

- The support for homebrew options seems to have been lost in fa4d0b6.
- We support installing options and checking installed options.
- Options are accepted if the installed ones are a super set of the ones
declared in rosdep.
- Checking installed packages can be slow, as we have to call the `brew`
command for each potential package to check if it is really linked and if the
options are ok.
- There are some limitations to what we can detect, for example we do not check
for formulae from wrong taps, we do not preserve already installed options
for reinstall of packages (see TODOs in source).
- Some scenarios cannot be resolved automatically, e.g. installing the correct
options for a package that is also in the dependency list of another homebrew
package to be installed (see TODOs in source).
- See https://github.com/ros-infrastructure/rosdep/issues/299 for a discussion
of what the semantics should/could be.

* This is an initial suggestion of what we could implement.
* What is missing is updating the unit tests.