adding uninstall to haskell-platform

[drostron]

No description provided.

[drostron]

I'm wondering about desired uninstall behavior for the case where someone has multiple versions of the Haskell platform installed. Is it an issue if the uninstall stanza results in the removal of all versions as the current PR would do? If so we could rely on the uninstall-hs script included with the Haskell platform to uninstall a specific version. That might be tricky unless there is a way to know which version was installed via cask.

[rolandwalker]

Ah. If I understand correctly, the uninstall-hs script needs arguments, to tell it which version to uninstall. We would have a hard time there.

Calling the version method on a Cask will only tell us what that value is for the very latest Cask definition -- not what the value was at a past point in time when the user ran brew cask install. We are really only just getting started on that sort of book-keeping: #3066.

There's also no provision for the user to pass through any command-line arguments to uninstall.

So it seems like :pkgutil is the way to go for now, but that doesn't mean we are giving up on doing better in the future.

If you think it is common for Haskell users to have multiple versions installed, we can add a caveats warning that explains the current uninstall behavior.

[drostron]

I was unable to achieve a complete uninstall with :pkgutil and updated the PR to use uninstall-hs instead.

Removing all installed versions seems reasonable for now until additional metadata is stored and available.

[rolandwalker]

Thanks!