I’ve spent days trying to setup neovim’s LSP for Unity development in C# with Mono and I’m at a loss…
Other LSP servers related to bash, lua, etc all work as expected.
While I don’t think it should matter, it may be worth noting my current setup. I have Unity installed on my system’s Windows installation and I’m running Linux through a virtual machine. Unity related projects are then “shared” to the VM. So the Linux environment is “Unity free”, I’m just using it for the vim/neovim coding side of things. The VM is where I’ve done all of my non-Unity dev stuff so that’s why I’m trying to carry that forward into Unity related work if possible.
Currently on Ubuntu 20.04.4 LTS x86_64
$ nvim --version
NVIM v0.8.0-dev+593-g5e5374035
Build type: Release
LuaJIT 2.1.0-beta3
Compiled by root@linux-VirtualBox
Features: +acl +iconv +tui
See ":help feature-compile"
system vimrc file: "$VIM/sysinit.vim"
fall-back for $VIM: "/usr/local/share/nvim"
Run :checkhealth for more info
Here is what I have tried so far
lsp/configs.lua
local status_ok, lsp_installer = pcall(require, "nvim-lsp-installer")
if not status_ok then
return
end
local lspconfig = require("lspconfig")
-- https://github.com/neovim/nvim-lspconfig/blob/master/doc/server_configurations.md
local servers = {
...
"omnisharp",
...
}
lsp_installer.setup({
ensure_installed = servers,
})
for _, server in pairs(servers) do
local opts = {
on_attach = require("user.lsp.handlers").on_attach,
capabilities = require("user.lsp.handlers").capabilities,
}
local has_custom_opts, server_custom_opts = pcall(require, "user.lsp.settings." .. server)
if has_custom_opts then
opts = vim.tbl_deep_extend("force", opts, server_custom_opts)
end
lspconfig[server].setup(opts)
end
lsp/handlers.lua
local M = {}
... -- Various keymaps and other customizations, trying to isolate just the relevant portions
M.on_attach = function(client, bufnr)
-- vim.notify(client.name .. " starting...")
-- TODO: refactor this into a method that checks if string in list
if client.name == "tsserver" then
client.resolved_capabilities.document_formatting = false
end
lsp_keymaps(bufnr)
lsp_highlight_document(client)
end
local capabilities = vim.lsp.protocol.make_client_capabilities()
local status_ok, cmp_nvim_lsp = pcall(require, "cmp_nvim_lsp")
if not status_ok then
return
end
M.capabilities = cmp_nvim_lsp.update_capabilities(capabilities)
return M
lsp/settings/omnisharp.lua
-- Mono
local omnisharp_bin = "mono /home/linux/.local/share/nvim/lsp_servers/omnisharp/omnisharp-mono/OmniSharp.exe"
-- Roslyn
-- local omnisharp_bin = "/home/linux/.local/omnisharp_roslyn/run"
-- https://neovim.discourse.group/t/setting-up-omnisharp-via-nvim-lspconfig-and-nvim-lspinstall/531/2
local pid = vim.fn.getpid()
local util = require 'lspconfig/util'
return {
-- https://github.com/williamboman/nvim-lsp-installer/issues/479#issuecomment-1128840405
use_mono = true,
cmd = { omnisharp_bin, "--languageserver" , "--hostPID", tostring(pid) };
...
}
(neovim) :LspInfo
1 client(s) attached to this buffer:
Client: omnisharp (id: 5, pid: 14634, bufnr: [46])
filetypes: cs, vb
autostart: true
root directory: /home/linux/<redacated>
cmd: mono /home/linux/.local/share/nvim/lsp_servers/omnisharp/omnisharp-mono/OmniSharp.exe --languageserver --hostPID 14505
Mono-Project
mono-project was installed with the following script, confirmed with --version and in being able to compile and execute the example code:
sudo apt-get install git autoconf libtool automake build-essential gettext cmake python3 curl -y
# https://www.mono-project.com/download/stable/
sudo apt install gnupg ca-certificates
sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 3FA7E0328081BFF6A14DA29AA6A19B38D3D831EF
echo "deb https://download.mono-project.com/repo/ubuntu stable-focal main" | sudo tee /etc/apt/sources.list.d/mono-official-stable.list
sudo apt update && \
sudo apt install mono-complete -y
$ mono --version
Mono JIT compiler version 6.12.0.182 (tarball Tue Jun 14 22:35:00 UTC 2022)
Copyright (C) 2002-2014 Novell, Inc, Xamarin Inc and Contributors. www.mono-project.com
TLS: __thread
SIGSEGV: altstack
Notifications: epoll
Architecture: amd64
Disabled: none
Misc: softdebug
Interpreter: yes
LLVM: yes(610)
Suspend: hybrid
GC: sgen (concurrent by default)
The various lsp related plugins I am currently using are
-- LSP and related {{{
use('folke/lsp-colors.nvim')
use('folke/trouble.nvim')
use('jose-elias-alvarez/null-ls.nvim')
use('neovim/nvim-lspconfig')
use('williamboman/nvim-lsp-installer')
}}}
-- completion {{{
use('hrsh7th/nvim-cmp')
use('hrsh7th/cmp-buffer')
use('hrsh7th/cmp-nvim-lsp')
use('hrsh7th/cmp-nvim-lua')
use('hrsh7th/cmp-path')
use('saadparwaiz1/cmp_luasnip')
--}}}
UPDATE 20220726 20:14
Something I noticed when running :LspLog
OmniSharp.CompositionHostBuilder: It looks like you have Mono installed which contains a MSBuild lower than 17.0.0 which is the minimum supported by the configured .NET Core Sdk.\n Try updating Mono to the latest stable or preview version to enable better .NET Core Sdk support.
Will start digging into the Mono install and with how the associated mono server is being called by Neovim’s LSP stuff…
UPDATE 20220726 20:43
$ dotnet msbuild -ver
Microsoft (R) Build Engine version 17.2.0+41abc5629 for .NET
Copyright (C) Microsoft Corporation. All rights reserved.
Seems the Neovim LSP server is using something different from what is output here… Hmm…
Support for --remote and friends. (github.com)