roslyn-language-server

A wrapper around the language server behind the C# Visual Studio Code extension, Microsoft.CodeAnalysis.LanguageServer, which makes it compatible with other editors, e.g., Helix. This is more stable and faster than OmniSharp.

This has only been tested on Linux.

This tool works around the quirks of Microsoft.CodeAnalysis.LanguageServer in the following way:

• Launches Microsoft.CodeAnalysis.LanguageServer as a process
• Passes the provided unix socket and forwards all communication to stdio
• Waits for Capabilities notification from server
  • Forces pull diagnostics to be available. This is a hack to make the server respect clients who does not support dynamic regisration of diagnostic capabilities. This is should be considered a bug in the server and can hopefully be removed with a future version of server
• Waits for an Initialize notification from the client
  • Finds relevant .sln or .csproj files and sends them to the server as an open notification.

Installation

Microsoft.CodeAnalysis.LanguageServer

The wrapper uses Microsoft.CodeAnalysis.LanguageServer so you need this on your path. If you use nix, you can grab nixpkgs.roslyn-ls.

Otherwise:

• Find and download Microsoft.CodeAnalysis.LanguageServer for your architecture at the public feed.
• Unzip the .nupkg file with unzip
• Find and move the Microsoft.CodeAnalysis.LanguageServer executable to a directory on your path, e.g., ~/.local/bin.

The wrapper

If you use nix, you can use this repository's nix flake.

Alternatively, install with cargo: cargo install --git https://github.com/SofusA/roslyn-language-server

Use with Helix

Since Microsoft.CodeAnalysis.LanguageServer only supports pull diagnostics and Helix does not (yet), you would need to use my branch at github:sofusa/helix-pull-diagnostics.

[language-server.roslyn]
command = "roslyn-language-server"

[[language]]
name = "c-sharp"
language-servers = ["roslyn"]