Unity Nvim Support

Script csproj_references_for_wsl_fix.cs simply translates paths references to binaries in .csproj from windows path to wsl/linux path.

Script sln_csproj_generator.cs auto generate .csproj files after scripts compilation.

Script open_in_tmux_nvim.sh - is a bash script that make Unity to open .cs scripts in my nvim environment - its not ready to go solution for everybody, so use its as reference to write your own

Requirements:

Unity Package com.unity.ide.visualstudio

How to?

Place scripts: sln_csproj_generator.cs and csproj_references_for_wsl_fix.cs in to your project, those are Editor only scripts so its wise to put them under Assets/Editor or you will get errors in runtime.

• sln_csproj_generator.cs will generate up-to-date .csproj after each script compilation - in detail - every time the domain is reloaded - its bound to [InitializeOnLoad].
• csproj_references_for_wsl_fix.cs will translate paths in .csproj from window to linux, so the references resolve correctly for nvim lsp - it executes as part of AssetPostprocessor.
• csproj_references_for_wsl_fix.cs have hardcoded enable bool enable = true;, so be aware of it and apply changes if its required.

Simplified events order: Scripts Compilation -> Domain Reload -> [InitializeOnLoad] -> Assets Import -> Assets Postprocessing.

Future development

• Wrap this repo in to Unity Package

lsp support for newly created files .cs from nvim/terminal

add line <Compile Include="Assets\**\*.cs" />, in Assembly-CSharp.csproj, ofc in ItemGroup where other files are included

How To Set Up Roslyn lsp

My setup:

wsl with Unbuntu22.04
NVIM v0.10.2
I use Mason for external tools for lsp, but Roslyn require to be set independently
but works alongside mason

1. Install .NET 9 SDK

Open your terminal and run:

sudo apt-get update
sudo apt-get install -y software-properties-common

Then install the .NET 9 SDK:

sudo add-apt-repository ppa:dotnet/backports
sudo apt-get update
sudo apt-get install -y dotnet-sdk-9.0

Verify the installation:

dotnet --list-sdks

Update Your Shell Environment (for zsh)

Add these lines to your ~/.zshrc (or your shell profile) so that dotnet and MSBuild are properly set:

export DOTNET_ROOT=/usr/lib/dotnet
export MSBuildSDKsPath="${DOTNET_ROOT}/sdk/9.0.103/Sdks"

Then reload your shell:

source ~/.zshrc

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2. Download and Unpack Roslyn

Download Roslyn for Linux

Download the package from:

• Linux:
  https://dev.azure.com/azure-public/vside/_artifacts/feed/vs-impl/NuGet/Microsoft.CodeAnalysis.LanguageServer.linux-x64/overview/5.0.0-1.25111.6

Or navigate to:

• Azure DevOps Artifact Feed:
  Go to https://dev.azure.com/azure-public/vside/_artifacts/feed/vs-impl and look for Microsoft.CodeAnalysis.LanguageServer, then select the Linux-x64 version and click download.

Unzip and Install Roslyn

Run these commands in your terminal (in WSL):

# Create the target directory for Roslyn
mkdir -p ~/.local/share/nvim/roslyn
cd ~/.local/share/nvim/roslyn

# Move your downloaded .nupkg to this folder and rename it (adjust <path_of_downloaded .nupkg> accordingly)
mv <path_of_downloaded .nupkg> roslyn.nupkg

# Unzip the .nupkg file into a temporary folder
unzip roslyn.nupkg -d roslyn_extracted

# Move the contents of the Linux-x64 folder to the current directory
mv roslyn_extracted/content/LanguageServer/linux-x64/* .

# Clean up the extracted folder and the original .nupkg file
rm -r roslyn_extracted roslyn.nupkg

Test the installation by running:

dotnet Microsoft.CodeAnalysis.LanguageServer.dll --version

You should see a version number printed.

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3. Extend File-Watching Limits in Ubuntu

For Unity projects, you may need to increase the number of files the OS can watch. Check your current limits:

cat /proc/sys/fs/inotify/max_user_instances
cat /proc/sys/fs/inotify/max_user_watches
ulimit -n

Temporarily increase them:

sudo sysctl -w fs.inotify.max_user_instances=512
sudo sysctl -w fs.inotify.max_user_watches=524288

To make these changes permanent, add the following lines to /etc/sysctl.conf:

echo "fs.inotify.max_user_instances=512" | sudo tee -a /etc/sysctl.conf
echo "fs.inotify.max_user_watches=524288" | sudo tee -a /etc/sysctl.conf
sudo sysctl -p

---

4. Neovim Plugin Configuration for Roslyn

Place this configuration in your Neovim config (e.g., in your Lua config file): https://github.com/seblyng/roslyn.nvim

return {
  "seblyng/roslyn.nvim",
  autostart = true,
  ft = "cs",
  config = {
    settings = {
      ["csharp|background_analysis"] = {
        background_analysis = {
          dotnet_analyzer_diagnostics_scope = "fullSolution",
          dotnet_compiler_diagnostics_scope = "fullSolution",
        }
      }
    }
  },
  exe = {
    "dotnet",
    vim.fs.joinpath(vim.fn.stdpath("data"), "roslyn", "Microsoft.CodeAnalysis.LanguageServer.dll"),
  },
  filewatching = true,
  capabilities = function()
    local capabilities = require("cmp_nvim_lsp").default_capabilities()

    capabilities = vim.tbl_deep_extend("force", capabilities, {
      textDocument = {
        foldingRange = {
          dynamicRegistration = true,
          lineFoldingOnly = true,
        },
        completion = {
          completionItem = {
            snippetSupport = true,
          },
        },
      },
      workspace = {
        didChangeWatchedFiles = {
          dynamicRegistration = true,
        },
      },
    })
    return capabilities
  end,
  root_dir = require("lspconfig").util.root_pattern("package.json", "yarn.lock", "tsconfig.json", ".git"),
}

Add this line somewhere in your nvim config to prevent bloating LspLog.

vim.lsp.set_log_level("error")

---

5. .csproj Workaround for LSP Support

To ensure that your LSP picks up new C# files automatically, add the following to your Assembly-CSharp.csproj:

(This will be add to auto generate in .csproj on compile in future)

# Look for item group that includes Compile elements, then add it here
  <Compile Include="Assets\**\*.cs">

Summary:

Roslyn should start in 10 sec for unity project, then with this set up it will work for any newly created file via terminal in this project.