Put the LSP implementation at Eclipse.org, with Ceylon

[mickaelistria]

The Ceylon language is in the process of moving to the Eclipse.org Foundation to ensure good governance: https://projects.eclipse.org/proposals/eclipse-ceylon . The Eclipse Foundation is also the host of the LSP4J project that is used by the implementation of Ceylon Language Server, and of several LSP related initiatives ( https://www.eclipse.org/community/eclipse_newsletter/2017/may/ ). It would make a lot of sense to move the Ceylon LSP implementation inside the Ceylon project as soon as this is moved to Eclipse.org !

[jvasileff]

It would be fine with me for the Eclipse/Ceylon project to absorb this project, but I think the decision would be up to @gavinking and @FroMage.

So far, I am the only contributor. I suspect we'd want to see more activity and interest before making this officially supported by the Ceylon project.

[FroMage]

I'm not opposed to it at all, but I think we should first wait for Eclipse to accept or not Ceylon.

[ShalokShalom]

How to succeed?

[mickaelistria]

The Eclipse Ceylon project is now provisionned and working. So I think the migration of the LS to github.com/eclipse/ceylon would now be possible. Even the VSCode specific parts could actually be part of the Ceylon project at Eclipse.org (but it would still be better to split those 2 parts in 2 distinct contributions).
@jvasileff Are you interested? If you are and @FroMage approves the idea, I'd be glad to provide some organisational assistance in completing this migration, which would ultimately lead to faster integration of Ceylon features in the LS, more visibility of the LS for the Ceylon lang community and simplified inclusion in other IDE such as Eclipse IDE, Eclipse Che, and so on.

[davidfestal]

@mickaelistria @FroMage After speaking with @jvasileff, I've already started looking into integrating his previous work on the VSCode LSP, with the ceylon-ide-common project. My goal is to produce a Ceylon LSP implementation that would inherit the numerous features already available in ceylon-ide-common (refactorings, completion, Java interop, etc ...).

However, it is in an early stage, and I didn't push anything for now, but I would expect adding it into the eclipse Ceylon GitHub repositories at some stage, under the repo: ceylon-language-server and with sources in the following base package: org.eclipse.ceylon.ide.lsp.

Since there's no planned date for the Eclipse Ceylon 1.4 release for now, I started this work based on the 1.3.3 Ceylon release, so that it can become available as soon as possible without waiting for Ceylon 1.4. Is it a problem (since 1.3.3 was released before Ceylon joining Eclipse) ?

[mickaelistria]

Thanks @davidfestal

[davidfestal]

Since there's no planned date for the Eclipse Ceylon 1.4 release for now, I started this work based on the 1.3.3 Ceylon release, so that it can become available as soon as possible without waiting for Ceylon 1.4. Is it a problem (since 1.3.3 was released before Ceylon joining Eclipse) ?

@mickaelistria wdyt about this question ?

[mickaelistria]

As a user or an integrator, I'm fine with it.

About the legal part, I guess that Ceylon 1.3.3 was already IP-approved by Eclipse Fondation, wasn't it?
If so, it means that you could check in your code depending on 1.3.3 at Eclipse.org without issue, as long as you do not modify the code of your dependencies.
If not, then it could be interesting to consider having the Ceylon project requesting IP approval for earlier releases of Ceylon to allow such "downstream" effort to join the club at Eclipse.org.

Another possibility, if there is no deadline nor constraints, would be that you write the LS on top of Ceylon 1.4 snapshot, and just release this together with Ceylon 1.4. But doing this, it means you couldn't release the LS earlier. Not sure whether it would be an issue.
It wouldn't be for me as my interest in Ceylon is only curiosity and "like", it's not something I or my team have goals built on top of.

[jvasileff]

I've hidden the questions/comments about debugging. Please keep comments germane to the issue. Thanks!