Only start the VSCode extension when a .ensime file exists

[smarter]

The extension is useless without it, and this avoids conflicts with
other extensions like the Dotty Language Server (which will only start
when a .dotty-ide.json file is present after
scala/scala3#2777)

[smarter]

Note that this won't cause the extension to be incorrectly used in non-Scala files because of the use of documentSelector in the extension itself: https://github.com/dragos/dragos-vscode-scala/blob/master/scala/src/extension.ts#L64

[dragos]

Actually, I'd like to still hijack the Scala language. Mainly, I want to be able to use the extension on simple projects that have no dependencies (and no Sbt project attached). While it doesn't do it yet, this has been long on my TODO list. How can we make that happen? Is there a way to disable this extension when .dotty-ide.json is present?

[smarter]

Is there a way to disable this extension when .dotty-ide.json is present?

No easy way as far as I can tell: https://code.visualstudio.com/docs/extensionAPI/activation-events

[dragos]

I'll merge this as is until I get to implement support for non-Sbt projects. BTW, what happens when the Dotty extension is also present?

[smarter]

Thanks!

BTW, what happens when the Dotty extension is also present?

When trying to hover over something it seems to get stuck at displaying "Loading.."