Premise
This guide is intended for Linux and macOS users. I haven’t tested this workflow on Windows, so its compatibility is not guaranteed.
Why am I writing this tutorial?
I work on a large Unreal Engine project and have been developing in Rider for a while. It worked fine, but last year I decided to learn Vim and installed its plugin in Rider.
The experience was hard and incredible at the same time. Now using Vim felt both fun and challenging!
However, I soon ran into two issues:
Rider was becoming increasingly heavy and sluggish for my Unreal Engine workflow.
I work across multiple PCs, programming languages, and game engines, and I wanted a single setup that works everywhere.
That’s when Neovim entered the stage.
Goal
With this tutorial, I want to help you achieve a functional setup and workflow with Neovim and Unreal Engine, the simplest way possible.
So even if you are a beginner (like me) using Neovim, this is also for you.
Prerequisites
Before setting up Neovim, we need to prepare some other things.
Install Python
Create a Python Virtual Environment
After you have installed Python, launch this command in your choosen directory.
python -m venv /path/to/new/virtual/environment
💡Tip: Set the activate cmd as an alias in your terminal configuration, so that you can call it from everywhere in your system.
E.g.:
alias pythonenv="source /home/thomas/Documents/python-venv/bin/activate"
Install ue4cli
This will be very important for our workflow.
It is a command-line tool which provides a simplified interface to various functionality of the build system for Unreal Engine.
After you install it, be sure to set the engine path using
ue4 setroot <your_unreal_engine_path>
Installing Neovim
There are a lot of ways to configure Neovim; you could spend hours digging through different setups, dotfiles, and YouTube tutorials, threads. But let's keep it simple.
My personal choice is kickstart.nvim.
This is a good starting point for your configuration. It provides a clean, modern Neovim setup right out of the box, and it is very well-documented.
Next steps:
- Head over to the Kickstart repo.
- Follow the installation steps, take your time with it.
- Once it’s installed, open Neovim for the first time.
Done? Awesome. You now have a working Neovim setup.
Unreal Engine Additional Configuration
Add Clangd
In our Neovim LSP configuration, we set up clangd with some extra flags:
local servers = {
+ clangd = { 'clangd', '--background-index', '--clang-tidy' },
-- gopls = {},
-- pyright = {},
-- rust_analyzer = {},
-- ... etc. See `:help lspconfig-all` for a list of all the pre-configured LSPs
--
-- Some languages (like typescript) have entire language plugins that can be useful:
-- https://github.com/pmizio/typescript-tools.nvim
--
-- But for many setups, the LSP (`ts_ls`) will work just fine
-- ts_ls = {},
--
lua_ls = {
-- cmd = { ... },
-- filetypes = { ... },
-- capabilities = {},
settings = {
Lua = {
completion = {
callSnippet = 'Replace',
},
-- You can toggle below to ignore Lua_LS's noisy `missing-fields` warnings
-- diagnostics = { disable = { 'missing-fields' } },
},
},
},
}
clangd
This is the C/C++ language server.--background-index
This tells clangd to index your entire project in the background.--clang-tidy
This enables clang-tidy integration, which is a tool for checking your code for code style issues, best-practice violations, and useful suggestions.
Add a Keymap to Search Unreal’s Content Folder
Unreal Engine stores all game assets in the Content/ folder, which is often ignored due to .gitignore rules.
This keymap lets you quickly search files directly in Content/, including hidden or ignored files.
-- See `: help telescope.builtin`
local builtin = require 'telescope.builtin'
vim.keymap.set('n', '<leader>sh', builtin.help_tags, { desc = '[S]earch [H]elp' })
vim.keymap.set('n', '<leader>sk', builtin.keymaps, { desc = '[S]earch [K]eymaps' })
vim.keymap.set('n', '<leader>sf', builtin.find_files, { desc = '[S]earch [F]iles' })
+ -- Unreal Engine Specific Keymap --
+ ----------------------------------
+ vim.keymap.set('n', '<leader>su', function()
+ require('telescope.builtin').find_files {
+ cwd = 'Content',
+ hidden = true,
+ no_ignore = true,
+ prompt_title = 'Unreal Assets',
+ }
+ end, { desc = '[S]earch [U]nreal Content' })
+ ----------------------------------
vim.keymap.set('n', '<leader>ss', builtin.builtin, { desc = '[S]earch [S]elect Telescope' })
vim.keymap.set('n', '<leader>sw', builtin.grep_string, { desc = '[S]earch current [W]ord' })
vim.keymap.set('n', '<leader>sg', builtin.live_grep, { desc = '[S]earch by [G]rep' })
vim.keymap.set('n', '<leader>sd', builtin.diagnostics, { desc = '[S]earch [D]iagnostics' })
vim.keymap.set('n', '<leader>sr', builtin.resume, { desc = '[S]earch [R]esume' })
vim.keymap.set('n', '<leader>s.', builtin.oldfiles, { desc = '[S]earch Recent Files ("." for repeat)' })
vim.keymap.set('n', '<leader><leader>', builtin.buffers, { desc = '[ ] Find existing buffers' })
Add debug and custom plugins
Here, we enable the plugins we need for our configuration.
Feel free to enable other plugins if you want.
-- NOTE: Next step on your Neovim journey: Add/Configure additional plugins for Kickstart
--
-- Here are some example plugins that I've included in the Kickstart repository.
-- Uncomment any of the lines below to enable them (you will need to restart nvim).
--
+ require 'kickstart.plugins.debug',
-- require 'kickstart.plugins.indent_line',
-- require 'kickstart.plugins.lint',
-- require 'kickstart.plugins.autopairs',
-- require 'kickstart.plugins.neo-tree',
-- require 'kickstart.plugins.gitsigns', -- adds gitsigns recommend keymaps
-- NOTE: The import below can automatically add your own plugins, configuration, etc from `lua/custom/plugins/*.lua`
-- This is the easiest way to modularize your config.
--
-- Uncomment the following line and add your plugins to `lua/custom/plugins/*.lua` to get going.
+ { import = 'custom.plugins' },
Add UnrealUtils Module
I made some utility functions to avoid hardcoded string paths. These will be used for our custom command to build our project directly inside Neovim.
Create the file /.config/nvim/lua/custom/unreal-utils.lua
local UnrealUtils = {}
function UnrealUtils.find_uproject_files()
local cwd = vim.fn.getcwd()
return vim.fn.globpath(cwd, '*.uproject', false, true)
end
function UnrealUtils.get_default_engine_path()
return os.getenv 'UNREAL_ENGINE_PATH'
end
return UnrealUtils
find_uproject_files()
- This function searches through the current working directory (which will be your game project directory) to find a *.uproject file.
get_default_engine_path()
- This allows each machine to have its Unreal Engine path configured individually via an environment variable.
Now open your terminal configuration and add the environment variable.
Linux:
export UNREAL_ENGINE_PATH=".../UnrealEngine/Engine/Binaries/Linux/UnrealEditor-Linux-DebugGame"
MacOS:
export UNREAL_ENGINE_PATH=".../UnrealEngine/Engine/Binaries/Mac/UnrealEditor-Mac-DebugGame.app/Contents/MacOS/UnrealEditor-Mac-DebugGame"
Setup the debug plugin
/.config/nvim/lua/kickstart/plugins/debug.lua
Adding codelldb debugger
require('mason-nvim-dap').setup {
-- Makes a best effort to set up the various debuggers with
-- reasonable debug configurations
automatic_installation = true,
-- You can provide additional configuration to the handlers,
-- see mason-nvim-dap README for more information
handlers = {},
-- You'll need to check that you have the required things installed
-- online, please don't ask me how to install them :)
ensure_installed = {
-- Update this to ensure that you have the debuggers for the langs you want
'delve',
+ 'codelldb',
},
}
Save, close and reopen Neovim, this ensures that your updated Lua config is loaded.
Run :Mason, then open the Mason UI and check that codelldb appears in the installed tools list.
Dap C++ Configuration
Put it inside the config function:
config = function()
local dap = require 'dap'
local dapui = require 'dapui'
-- Add the DAP configurations below 👇
dap.adapters.codelldb = {
type = 'server',
port = '${port}',
executable = {
-- You can also use `vim.fn.stdpath("data") .. "/mason/bin/codelldb"` if installed via Mason
command = vim.fn.stdpath 'data' .. '/mason/packages/codelldb/extension/adapter/codelldb',
args = { '--port', '${port}' },
},
}
local unreal_utils = require 'custom.unreal-utils'
local uprojects = unreal_utils.find_uproject_files()
dap.configurations.cpp = {
{
name = 'Dynamic Launch',
type = 'codelldb',
request = 'launch',
cwd = '${workspaceFolder}',
stopOnEntry = false,
program = function()
if vim.tbl_isempty(uprojects) then
-- Fallback: ask for an executable path if no .uproject found
return vim.fn.input('Path to executable: ', vim.fn.getcwd() .. '/', 'file')
end
return unreal_utils.get_default_engine_path()
end,
args = function()
if vim.tbl_isempty(uprojects) then
return {}
end
-- Launch unreal with the first found .uproject, and the provided args
return { uprojects[1], '-log', '-debug' }
end,
},
What it does:
Now the functions from UnrealUtils come in handy.
When you start a debug session with DAP, it first checks if an uproject file exists in the current directory:
- If no .uproject is found, it prompts you to manually enter the path to a compiled C++ executable.
- If a .uproject is present, it automatically uses the default Unreal Engine executable (as returned by get_default_engine_path()) and passes the first .uproject file along with -log and -debug arguments to launch Unreal in debug mode.
Unreal Engine Build Command for Neovim
.config/nvim/lua/custom/plugins/init.lua
This module creates a user command :UEBuild that:
- Opens a floating window showing the output of
ue4 build DebugGame - Highlights errors and warnings in real time
- Automatically closes the window on success or when pressing
- Optionally continues debugging via DAP if build succeeds
-- You can add your own plugins here or in other files in this directory!
-- I promise not to create any merge conflicts in this directory :)
--
-- See the kickstart.nvim README for more information
local ns = vim.api.nvim_create_namespace 'BuildHighlights'
local function highlight_errors(buf)
local lines = vim.api.nvim_buf_get_lines(buf, 0, -1, false)
vim.api.nvim_buf_clear_namespace(buf, ns, 0, -1)
for i, line in ipairs(lines) do
if line:lower():find 'error:' then
vim.api.nvim_buf_add_highlight(buf, ns, 'ErrorMsg', i - 1, 0, -1)
elseif line:lower():find 'warning:' then
vim.api.nvim_buf_add_highlight(buf, ns, 'WarningMsg', i - 1, 0, -1)
end
end
end
return {
vim.api.nvim_create_user_command('UEBuild', function()
local buf = vim.api.nvim_create_buf(false, true)
vim.bo[buf].bufhidden = 'wipe'
vim.bo[buf].filetype = 'log'
local width = math.floor(vim.o.columns * 0.5)
local height = math.floor(vim.o.lines * 0.5)
local row = math.floor((vim.o.lines - height) / 2)
local col = math.floor((vim.o.columns - width) / 2)
local cwd = vim.fn.getcwd()
local project_name = cwd:match '([^/]+)$'
local win = vim.api.nvim_open_win(buf, true, {
title = '*** Building ' .. project_name .. ' ***',
title_pos = 'center',
relative = 'editor',
width = width,
height = height,
row = row,
col = col,
border = 'rounded',
style = 'minimal',
})
local cmd = 'ue4 build DebugGame'
vim.api.nvim_buf_set_lines(buf, 0, -1, false, { 'Running: ' .. cmd, '' })
local function append(data)
if not data then
return
end
vim.api.nvim_buf_set_lines(buf, -1, -1, false, data)
vim.api.nvim_win_set_cursor(win, { vim.api.nvim_buf_line_count(buf), 0 })
highlight_errors(buf)
end
local job_finished = false
vim.fn.jobstart({ 'bash', '-c', cmd }, {
stdout_buffered = false,
stderr_buffered = false,
on_stdout = function(_, data)
append(data)
end,
on_stderr = function(_, data)
append(data)
end,
on_exit = function(_, code)
append { '', '--- Process exited with code ' .. code .. ' ---' }
job_finished = true
if code == 0 then
vim.notify('✅ Build succeeded: ', vim.log.levels.INFO)
-- Close the window after 500ms
vim.defer_fn(function()
if vim.api.nvim_win_is_valid(win) then
vim.api.nvim_win_close(win, true)
end
require('dap').continue()
end, 500)
else
vim.notify('❌ Build failed (' .. code .. ')', vim.log.levels.ERROR)
end
end,
})
vim.keymap.set('n', '<Esc>', function()
if job_finished and vim.api.nvim_win_is_valid(win) then
vim.api.nvim_win_close(win, true)
end
end, { buffer = buf, nowait = true })
end, {}),
}
Remember, you must be in a Python virtual environment to make this work.
Last step, generate compile_commands.json
Why do we need it?
compile_commands.json provides clangd with the full compilation context for your project, enabling code completion, navigation, and correct error reporting.
When we run the command ue4 gen -vscode, it already generates the JSON file for us, but it's not enough, and to work correctly we have to adjust it.
Why should we modify the existing one?
We have to modify the existing compile_commands.json file because the one generated by Unreal or VSCode contains incomplete or incompatible compilation commands for clangd. By adjusting it and adding some compiler flags, standard, and ignoring unnecessary warnings, we ensure that clangd can correctly parse all files, understand macros and templates, provide accurate code completion, and highlight only real errors and warnings.
We can see below that by using the default generated JSON file, clangd shows several wrong errors.
This is after we launch our script.
We can see that clangd stops showing weird false errors, and the IntelliSense is working.
Noice!
Now, if you didn't already do it, launch the command
ue4 gen -vscode to generate the default one.
Then create the file: generate_compile_commands.sh, and launch it specifying the arguments.
#!/bin/bash
# Usage: ./generate_compile_commands.sh <folder_path> <project_name>
set -e
if [ $# -ne 2 ]; then
echo "Usage: $0 <folder_path> <project_name>"
exit 1
fi
folder="$1"
project="$2"
input="$folder/.vscode/compileCommands_${project}.json"
output="$folder/compile_commands.json"
if [ ! -d "$folder/.vscode" ]; then
echo "Error: Folder '$folder/.vscode' not found."
exit 1
fi
if [ ! -f "$input" ]; then
echo "Error: File '$input' not found."
exit 1
fi
cat "$input" | python3 -c '
import json, sys
j = json.load(sys.stdin)
for o in j:
file = o["file"]
arg = o["arguments"][1]
o["arguments"] = [f"clang++ -std=c++20 -ferror-limit=0 -fdiagnostics-color=always "
"-Wall -Wextra -Wshadow-all "
"-Wno-unused-parameter -Wno-unused-private-field -Wno-missing-field-initializers "
"-Wno-inconsistent-missing-override -Wno-undefined-var-template -Wno-unused-variable "
"-Wno-sign-compare -Wno-expansion-to-defined -Wno-undef -Wno-deprecated-declarations -Wno-invalid-offsetof "
"-fno-ms-compatibility -fno-delayed-template-parsing -fmacro-backtrace-limit=0 "
f"{file} {arg}"]
print(json.dumps(j, indent=2))
' > "$output"
echo "Generated $output successfully."
Conclusion
Awesome! 🎉🎉🎉
After running the script, you can finally open your project with nvim . and build it using :UEBuild, giving you a fully integrated and efficient workflow for developing Unreal Engine projects directly from Neovim.
Additional plugins I use:
- neo-tree (you have to enable it in kickstart.nvim)
- catppuccin
- autosession
- barbar
- autopairs (you have to enable it in kickstart.nvim)
- gitsigns (you have to enable it in kickstart.nvim)
Other useful resources:
https://rodneylab.com/unreal-engine-with-neovim/
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