Add expansion support for Ensime Mode

[swsnr]

Adds support for Ensime Mode, by hooking Ensime's syntactic expansion feature into Expand Region.

/cc @fommil

[fommil]

Fantastic! Ping me when its on MELPA and I'll tweet it.

[swsnr]

@fommil You can just subscribe to this ticket, can't you?

[fommil]

Ah yes that's true.

[swsnr]

@fommil I'll open a PR for Ensime tomorrow, as copyright assignment apparently stand in the way of merging this one. I'm sorry for the hassle, I didn't know this.

[fommil]

If you contribute to ensime-emacs can you make this an optional dependency? See how we do that for ensime-autacomplete (might be in a PR waiting for merge). Reducing dep list is a high priority right now.

[swsnr]

Sure, that was my plan. It's easy enough 😎

[swsnr]

@fommil I think it's probably even better to just put this code into a separate package on MELPA, e.g. ensime-expand-region or so, to prevent an expand-region dependency from creeping into Ensime right away. What do you think?

[fommil]

OK, that works too! In a couple of years, we can just fold it into ENSIME proper as all deps will be Emacs core. Make sure you add it to the wiki, we should probably create a "favourite Scala modes" page with stuff like this and some other useful .emacs config.

[swsnr]

@fommil To what wiki? That of Ensime Emacs? If you want I can also use a repo within the Ensime org, for better discoverability of the new extension…

[fommil]

Yup. I'm actually OK with you dropping it into ensime-emacs and then people need to manually install expand-region if they want to use it. Best that we are consistent with how we handle optional modules. I'm traveling for a day but if you raise a PR I'll show you what needs to be done to make it optional.

[swsnr]

Ok, I'll knock together a PR for Ensime Emacs, and wait for your review.

[swsnr]

@fommil See https://github.com/ensime/ensime-emacs/issues/263