In this post, I will share how to set up sumneko lua for nvim-lspconfig.

Install sumneko lua

First, we need to install its dependency packages.

ninja

On Linux, install ninja from its binary release:

wget https://hub.fastgit.xyz/ninja-build/ninja/releases/download/v1.10.2/ninja-linux.zip

mkdir -p $HOME/local/bin
unzip ninja-linux.zip -d $HOME/local/bin

On macOS, install ninja via homebrew:

brew install ninja

C++ compiler

We need to install a cpp compile that support c++ 17, gcc-7.3 is fine. Clang 12.0 is also fine.

build

Build lua-language-server:

mkdir -p $HOME/tools/ && cd $HOME/tools
git clone --depth=1 https://hub.fastgit.xyz/sumneko/lua-language-server

cd lua-language-server
# if the cloning speed is too slow, edit .gitmodules and replace github.com
# with hub.fastgit.org, which should be faster than github.
git submodule update --init --recursive

# build on Linux
cd 3rd/luamake
compile/install.sh
cd ../..
./3rd/luamake/luamake rebuild

After that, we should add the path to lua-language-server to PATH:

# For macOS
export PATH="$HOME/tools/lua-language-server/bin/macOS:$PATH"

# For Linux
export PATH="$HOME/tools/lua-language-server/bin/Linux:$PATH"

Config for nvim-lspconfig

Following the instructions on the nvim-lspconfig repo, it is pretty straight forward to config sumneko-lua for Nvim. Here is a working config for me:

local sumneko_binary_path = vim.fn.exepath('lua-language-server')
local sumneko_root_path = vim.fn.fnamemodify(sumneko_binary_path, ':h:h:h')

local runtime_path = vim.split(package.path, ';')
table.insert(runtime_path, "lua/?.lua")
table.insert(runtime_path, "lua/?/init.lua")

require'lspconfig'.sumneko_lua.setup {
    cmd = {sumneko_binary_path, "-E", sumneko_root_path .. "/main.lua"};
    settings = {
        Lua = {
        runtime = {
            -- Tell the language server which version of Lua you're using (most likely LuaJIT in the case of Neovim)
            version = 'LuaJIT',
            -- Setup your lua path
            path = runtime_path,
        },
        diagnostics = {
            -- Get the language server to recognize the `vim` global
            globals = {'vim'},
        },
        workspace = {
            -- Make the server aware of Neovim runtime files
            library = vim.api.nvim_get_runtime_file("", true),
        },
        -- Do not send telemetry data containing a randomized but unique identifier
        telemetry = {
            enable = false,
        },
        },
    },
}

References