Eli Zaretskii <eliz@gnu.org> writes:

>> From: João Távora <joaotavora@gmail.com>
>> Date: Thu, 10 May 2018 23:34:40 +0100
>> 
>> I'd like to add Eglot, my new package, to GNU ELPA.
>> 
>> Eglot, for Emacs Polyglot, is an Emacs client for the LSP, or Language
>> Server Protocol (https://microsoft.github.io/language-server-protocol/).
>
> FWIW, I think LSP support should be part of the core Emacs
> distribution, as it's an infrastructure necessary for modern support
> of programming modes.  (I didn't yet look at the package, so if it has
> separate infrastructure and application levels, perhaps only the
> infrastructure layers should be in Emacs.)

Hi again, Eli

So, off-list Stefan likewise suggested that some level of LSP
"infrastructure" is integrated into Emacs, which could lead to merging
eglot.el and other LSP clients like lsp-mode.el in the future.

As JSONRPC support is a mandatory component of LSP, I've extracted a
library implementing the JSONRPC spec (see www.jsonrpc.org) out of
eglot.el.

I propose this library, jrpc.el, for Emacs core (or GNU ELPA, or
both). I hope people can review it, comment on it, and propose changes,
particularly developers of other existing LSP-modes.  I attach to the
end of this mail with a reasonably complete ";;; Commentary" header,
including a simple usage example.

JSONRPC is apparently also used for other non-LSP applications. See
http://json-rpc.info/.

There's a jsonrpc-refactor branch of eglot.el using jrpc.el, for those
who want to test it with a real application.

Thanks in advance,
João