New QGIS 2.0.0 cask

[hanxue]

• See issue Checking for GDAL Framework Dependency #5074 - requires GDAL Framework and Matplotlib
• TODO: Add GDAL Framework and Matplotlib as Cask dependency once Caskroom supports it

[radeksimko]

I think we could guide the user a bit more until we'll actually support dependencies.

e.g. see https://github.com/caskroom/homebrew-cask/blob/master/Casks/chunkulus.rb#L18

regarding the silent fail during installation - there's apparently similar issue with prey which requires reinstallation too.

I'd change it for the time being to this (until we figure out why it's silently failing and how we can fix it):

  caveats do
    <<-EOS.undent
    #{@cask} requires the GDAL framework and Matplotlib to be installed first,
    otherwise the installation will fail. Try installing it with

        brew cask install gdal-framework matplotlib 

    and then reinstall QGIS

        brew cask uninstall qgis
        brew cask install qgis
    EOS
  end

@rolandwalker it's quite exhaustive, but I'm afraid it's the best we can do (so far), any feedback here?

[rolandwalker]

The exhaustive approach seems like the best you can do now.

caveats also get printed during brew cask info. It's impossible to get the wording consistent for both situations, so (like you) I just word them for the case of brew cask install.

[radeksimko]

@hanxue Thank you for the contribution. It will be merged in a different pull request with mentioned caveats changes + some other simple alternations (see #4910). Your contribution is still included (and still credited to you), with the appropriate modifications, when applicable.