communicating file encoding

[vladdu]

Some programming languages use magic comments at the beginning to specify the encoding of the file. The server and client need to agree on the encoding, so that positions and ranges match. Should the protocol sync this information? Or do we rely on the client and server implementations doing the right thing?

VScode doesn't have support for magic comments yet (created microsoft/vscode#32764).

#96 (comment) mentions something about this, but I can't find any follow-up.

[dbaeumer]

There are IMO to different cases:

• the file is open in the tools. In this case the content is described in memory and there is no need to transfer any encoding. The files content has been transferred to the server via the open request
• the server wants to read a file from disk and wants to reuse encoding information stored with the client. This should be handles with the newly proposed getConfiguration request sent from the server to the client. See Protocol extension to allow servers to fetch configuration settings #299. What we need to agree on is a setting describing for example the encoding. A proposal could be files.encoding