Nvim Config

Neovim Configuration Skill

Manages Neovim configuration through Lua-based init files and modular configuration structure.

Important Context

This dotfiles repository has a symlinked Neovim configuration:

• Configuration location: config/nvim/
• Symlinked to: ~/.config/nvim/ (XDG standard)
• All changes are applied globally to the Neovim installation

Current state: Configuration directory exists but is empty (ready for initial setup)

Neovim Configuration Structure

Modern Lua-Based Configuration (Recommended)

config/nvim/
├── init.lua                    # Main entry point
├── lua/
│   ├── config/
│   │   ├── options.lua        # Editor options (tab size, line numbers, etc.)
│   │   ├── keymaps.lua        # Custom keybindings
│   │   ├── autocmds.lua       # Autocommands
│   │   └── lazy.lua           # Plugin manager setup (lazy.nvim)
│   └── plugins/
│       ├── lsp.lua            # LSP configuration
│       ├── treesitter.lua     # Syntax highlighting
│       ├── telescope.lua      # Fuzzy finder
│       └── ...                # Other plugin configs
└── after/
    └── plugin/                # Plugin-specific overrides

Legacy Vimscript (For Vim Compatibility)

config/nvim/
├── init.vim                   # Main entry point (Vimscript)
├── plugin/                    # Plugin configurations
└── after/plugin/              # Late-loading configs

Note: Use either init.lua OR init.vim, not both. Lua is recommended for new configurations.

Configuration Categories

1. Editor Options

Set in lua/config/options.lua:

-- Basic editor settings
vim.opt.number = true              -- Show line numbers
vim.opt.relativenumber = true      -- Relative line numbers
vim.opt.tabstop = 4                -- Tab width
vim.opt.shiftwidth = 4             -- Indent width
vim.opt.expandtab = true           -- Use spaces instead of tabs
vim.opt.smartindent = true         -- Auto-indent new lines

-- UI enhancements
vim.opt.termguicolors = true       -- True color support
vim.opt.signcolumn = "yes"         -- Always show sign column
vim.opt.wrap = false               -- No line wrapping
vim.opt.cursorline = true          -- Highlight current line

-- Search settings
vim.opt.ignorecase = true          -- Case-insensitive search
vim.opt.smartcase = true           -- Case-sensitive if uppercase used
vim.opt.hlsearch = true            -- Highlight search results

-- Split behavior
vim.opt.splitright = true          -- Vertical splits go right
vim.opt.splitbelow = true          -- Horizontal splits go below

-- Performance
vim.opt.updatetime = 250           -- Faster completion
vim.opt.timeoutlen = 300           -- Faster key sequence timeout

-- Backup and undo
vim.opt.backup = false             -- No backup files
vim.opt.swapfile = false           -- No swap files
vim.opt.undofile = true            -- Persistent undo

Access via Vimscript:

set number
set relativenumber
set tabstop=4

2. Keymaps

Set in lua/config/keymaps.lua:

-- Set leader key
vim.g.mapleader = " "              -- Space as leader key
vim.g.maplocalleader = " "

-- Helper function for mappings
local map = function(mode, lhs, rhs, opts)
  opts = opts or {}
  opts.silent = opts.silent ~= false
  vim.keymap.set(mode, lhs, rhs, opts)
end

-- General mappings
map("n", "<leader>w", "<cmd>w<cr>", { desc = "Save file" })
map("n", "<leader>q", "<cmd>q<cr>", { desc = "Quit" })
map("n", "<Esc>", "<cmd>nohlsearch<cr>", { desc = "Clear highlights" })

-- Window navigation
map("n", "<C-h>", "<C-w>h", { desc = "Move to left window" })
map("n", "<C-j>", "<C-w>j", { desc = "Move to bottom window" })
map("n", "<C-k>", "<C-w>k", { desc = "Move to top window" })
map("n", "<C-l>", "<C-w>l", { desc = "Move to right window" })

-- Window resizing
map("n", "<C-Up>", "<cmd>resize +2<cr>", { desc = "Increase height" })
map("n", "<C-Down>", "<cmd>resize -2<cr>", { desc = "Decrease height" })
map("n", "<C-Left>", "<cmd>vertical resize -2<cr>", { desc = "Decrease width" })
map("n", "<C-Right>", "<cmd>vertical resize +2<cr>", { desc = "Increase width" })

-- Buffer navigation
map("n", "<S-h>", "<cmd>bprevious<cr>", { desc = "Previous buffer" })
map("n", "<S-l>", "<cmd>bnext<cr>", { desc = "Next buffer" })

-- Better indenting
map("v", "<", "<gv")
map("v", ">", ">gv")

-- Move lines
map("n", "<A-j>", "<cmd>m .+1<cr>==", { desc = "Move line down" })
map("n", "<A-k>", "<cmd>m .-2<cr>==", { desc = "Move line up" })
map("v", "<A-j>", ":m '>+1<cr>gv=gv", { desc = "Move selection down" })
map("v", "<A-k>", ":m '<-2<cr>gv=gv", { desc = "Move selection up" })

Mapping modes:

• n - Normal mode
• i - Insert mode
• v - Visual mode
• x - Visual block mode
• t - Terminal mode
• c - Command mode

3. Plugin Management (lazy.nvim)

Set in lua/config/lazy.lua:

-- Bootstrap lazy.nvim
local lazypath = vim.fn.stdpath("data") .. "/lazy/lazy.nvim"
if not vim.loop.fs_stat(lazypath) then
  vim.fn.system({
    "git",
    "clone",
    "--filter=blob:none",
    "https://github.com/folke/lazy.nvim.git",
    "--branch=stable",
    lazypath,
  })
end
vim.opt.rtp:prepend(lazypath)

-- Configure plugins
require("lazy").setup({
  spec = {
    { import = "plugins" },     -- Import all plugin specs from lua/plugins/
  },
  defaults = {
    lazy = false,               -- Load plugins immediately
    version = false,            -- Use latest git commit
  },
  install = { colorscheme = { "habamax" } },
  checker = { enabled = true }, -- Check for updates
  performance = {
    rtp = {
      disabled_plugins = {
        "gzip",
        "tarPlugin",
        "tohtml",
        "tutor",
        "zipPlugin",
      },
    },
  },
})

Plugin specification format:

return {
  "plugin-author/plugin-name",
  dependencies = { "dependency-plugin" },
  config = function()
    -- Plugin configuration
  end,
  keys = {
    { "<leader>ff", "<cmd>Telescope find_files<cr>", desc = "Find files" },
  },
  event = "VeryLazy",           -- Lazy load on event
  cmd = "PluginCommand",        -- Lazy load on command
  ft = "filetype",              -- Lazy load on filetype
}

4. LSP Configuration

Set in lua/plugins/lsp.lua:

return {
  "neovim/nvim-lspconfig",
  dependencies = {
    "williamboman/mason.nvim",           -- LSP installer
    "williamboman/mason-lspconfig.nvim", -- Mason-lspconfig bridge
    "hrsh7th/cmp-nvim-lsp",              -- LSP completion source
  },
  config = function()
    -- Mason setup (LSP installer)
    require("mason").setup()
    require("mason-lspconfig").setup({
      ensure_installed = {
        "lua_ls",        -- Lua
        "rust_analyzer", -- Rust
        "gopls",         -- Go
        "pyright",       -- Python
        "ts_ls",         -- TypeScript
      },
    })

    -- LSP keymaps (set on attach)
    local bufnr)
      local map = function(keys, func, desc)
        vim.keymap.set("n", keys, func, { buffer = bufnr, desc = "LSP: " .. desc })
      end

      map("gd", vim.lsp.buf.definition, "Goto Definition")
      map("gr", vim.lsp.buf.references, "Goto References")
      map("gI", vim.lsp.buf.implementation, "Goto Implementation")
      map("<leader>D", vim.lsp.buf.type_definition, "Type Definition")
      map("<leader>rn", vim.lsp.buf.rename, "Rename")
      map("<leader>ca", vim.lsp.buf.code_action, "Code Action")
      map("K", vim.lsp.buf.hover, "Hover Documentation")
    end

    -- Capabilities (for completion)
    local capabilities = require("cmp_nvim_lsp").default_capabilities()

    -- Server configurations
    local lspconfig = require("lspconfig")

    lspconfig.lua_ls.setup({
     
      capabilities = capabilities,
      settings = {
        Lua = {
          diagnostics = { globals = { "vim" } },
          workspace = { checkThirdParty = false },
          telemetry = { enable = false },
        },
      },
    })

    lspconfig.rust_analyzer.setup({
     
      capabilities = capabilities,
      settings = {
        ["rust-analyzer"] = {
          cargo = { allFeatures = true },
          checkOnSave = { command = "clippy" },
        },
      },
    })

    lspconfig.gopls.setup({
     
      capabilities = capabilities,
      settings = {
        gopls = {
          analyses = {
            unusedparams = true,
          },
          staticcheck = true,
        },
      },
    })
  end,
}

5. Autocommands

Set in lua/config/autocmds.lua:

-- Highlight on yank
vim.api.nvim_create_autocmd("TextYankPost", {
  callback = function()
    vim.highlight.on_yank()
  end,
})

-- Auto-format on save
vim.api.nvim_create_autocmd("BufWritePre", {
  pattern = "*.go",
  callback = function()
    vim.lsp.buf.format()
  end,
})

-- Close certain filetypes with 'q'
vim.api.nvim_create_autocmd("FileType", {
  pattern = { "help", "qf", "man", "notify" },
  callback = function(event)
    vim.bo[event.buf].buflisted = false
    vim.keymap.set("n", "q", "<cmd>close<cr>", { buffer = event.buf, silent = true })
  end,
})

-- Restore cursor position
vim.api.nvim_create_autocmd("BufReadPost", {
  callback = function()
    local mark = vim.api.nvim_buf_get_mark(0, '"')
    if mark[1] > 0 and mark[1] <= vim.api.nvim_buf_line_count(0) then
      vim.api.nvim_win_set_cursor(0, mark)
    end
  end,
})

Main Entry Point (init.lua)

Minimal structure:

-- Set leader keys before loading plugins
vim.g.mapleader = " "
vim.g.maplocalleader = " "

-- Load core configurations
require("config.options")
require("config.keymaps")
require("config.autocmds")
require("config.lazy")  -- Plugin manager setup

Essential Plugins

Core Plugins

1. Color Scheme:

-- lua/plugins/colorscheme.lua
return {
  "folke/tokyonight.nvim",
  lazy = false,
  priority = 1000,
  config = function()
    vim.cmd([[colorscheme tokyonight-night]])
  end,
}

2. Treesitter (Syntax Highlighting):

-- lua/plugins/treesitter.lua
return {
  "nvim-treesitter/nvim-treesitter",
  build = ":TSUpdate",
  config = function()
    require("nvim-treesitter.configs").setup({
      ensure_installed = { "lua", "vim", "rust", "go", "python", "typescript" },
      highlight = { enable = true },
      indent = { enable = true },
    })
  end,
}

3. Telescope (Fuzzy Finder):

-- lua/plugins/telescope.lua
return {
  "nvim-telescope/telescope.nvim",
  dependencies = { "nvim-lua/plenary.nvim" },
  keys = {
    { "<leader>ff", "<cmd>Telescope find_files<cr>", desc = "Find files" },
    { "<leader>fg", "<cmd>Telescope live_grep<cr>", desc = "Live grep" },
    { "<leader>fb", "<cmd>Telescope buffers<cr>", desc = "Buffers" },
  },
}

4. Completion (nvim-cmp):

-- lua/plugins/completion.lua
return {
  "hrsh7th/nvim-cmp",
  dependencies = {
    "hrsh7th/cmp-nvim-lsp",
    "hrsh7th/cmp-buffer",
    "hrsh7th/cmp-path",
    "L3MON4D3/LuaSnip",
  },
  config = function()
    local cmp = require("cmp")
    cmp.setup({
      mapping = cmp.mapping.preset.insert({
        ["<C-b>"] = cmp.mapping.scroll_docs(-4),
        ["<C-f>"] = cmp.mapping.scroll_docs(4),
        ["<C-Space>"] = cmp.mapping.complete(),
        ["<CR>"] = cmp.mapping.confirm({ select = true }),
      }),
      sources = {
        { name = "nvim_lsp" },
        { name = "buffer" },
        { name = "path" },
      },
    })
  end,
}

Workflow Instructions

Initial Setup (Empty Configuration)

Create minimal init.lua:

-- config/nvim/init.lua
vim.g.mapleader = " "
vim.opt.number = true
vim.opt.relativenumber = true
vim.opt.expandtab = true
vim.opt.shiftwidth = 4
vim.opt.tabstop = 4

Or create full modular structure:

1. Create init.lua with module imports
2. Create lua/config/ directory with options, keymaps, autocmds
3. Create lua/plugins/ directory for plugin specs
4. Set up lazy.nvim plugin manager

Modifying Existing Configuration

Always start by reading:

Read config/nvim/init.lua
Read config/nvim/lua/config/options.lua
Read config/nvim/lua/config/keymaps.lua

Use Edit tool for precise changes:

1. Read current configuration
2. Identify exact section to modify
3. Use Edit to replace specific content
4. Preserve Lua syntax and structure

Adding Plugins

Create new plugin spec:

-- config/nvim/lua/plugins/myplugin.lua
return {
  "author/plugin-name",
  dependencies = {},
  config = function()
    -- Plugin setup
  end,
}

Adding Keymaps

Append to keymaps.lua:

-- Add to lua/config/keymaps.lua
map("n", "<leader>gg", "<cmd>LazyGit<cr>", { desc = "Open LazyGit" })

Configuring LSP Servers

Add to mason ensure_installed:

ensure_installed = {
  "lua_ls",
  "rust_analyzer",
  "new_server_name",  -- Add new server
}

Add server-specific configuration:

lspconfig.new_server.setup({
 
  capabilities = capabilities,
  settings = {
    -- Server-specific settings
  },
})

Common Configuration Tasks

1. Set Theme

-- lua/plugins/colorscheme.lua
return {
  "catppuccin/nvim",
  name = "catppuccin",
  priority = 1000,
  config = function()
    vim.cmd([[colorscheme catppuccin-mocha]])
  end,
}

2. Configure Tab Behavior

-- lua/config/options.lua
vim.opt.tabstop = 2        -- Tab width
vim.opt.shiftwidth = 2     -- Indent width
vim.opt.expandtab = true   -- Use spaces

3. Enable Format on Save

-- lua/config/autocmds.lua
vim.api.nvim_create_autocmd("BufWritePre", {
  pattern = "*",
  callback = function()
    vim.lsp.buf.format()
  end,
})

4. Add File Explorer (neo-tree)

-- lua/plugins/neo-tree.lua
return {
  "nvim-neo-tree/neo-tree.nvim",
  dependencies = {
    "nvim-lua/plenary.nvim",
    "nvim-tree/nvim-web-devicons",
    "MunifTanjim/nui.nvim",
  },
  keys = {
    { "<leader>e", "<cmd>Neotree toggle<cr>", desc = "Toggle file explorer" },
  },
}

5. Configure Go Development

-- Ensure gopls is installed
ensure_installed = { "gopls" }

-- Add Go-specific settings
lspconfig.gopls.setup({
 
  capabilities = capabilities,
  settings = {
    gopls = {
      gofumpt = true,              -- Use gofumpt formatter
      analyses = {
        unusedparams = true,
        shadow = true,
      },
      staticcheck = true,
    },
  },
})

-- Auto-format Go files on save
vim.api.nvim_create_autocmd("BufWritePre", {
  pattern = "*.go",
  callback = function()
    vim.lsp.buf.format()
  end,
})

Best Practices

1. Modular structure - Separate options, keymaps, plugins into distinct files
2. Lazy loading - Use lazy.nvim to load plugins on demand
3. Descriptive keymaps - Always include desc for which-key integration
4. LSP-first - Use LSP for language features instead of custom scripts
5. Persistent undo - Enable undofile for undo history across sessions
6. Leader key - Use space as leader for custom mappings
7. Performance - Disable unused built-in plugins in lazy.nvim config

Neovim-Specific Features

Lua API advantages:

• Better performance than Vimscript
• Native async support
• Cleaner syntax for configuration
• First-class LSP support

XDG Base Directory:

• Config: ~/.config/nvim/
• Data: ~/.local/share/nvim/
• State: ~/.local/state/nvim/
• Cache: ~/.cache/nvim/

Built-in LSP:

• No plugin required for basic LSP functionality
• Use vim.lsp.buf.* for LSP operations
• Configure servers via nvim-lspconfig

Troubleshooting

Check Configuration Location

:echo stdpath('config')  " Should show ~/.config/nvim

Reload Configuration

:source $MYVIMRC         " Reload init file
:Lazy sync               " Update plugins

Check Plugin Status

:Lazy                    " Open plugin manager UI
:checkhealth             " Run health checks

LSP Issues

:LspInfo                 " Check attached servers
:Mason                   " Manage LSP servers
:LspRestart              " Restart LSP servers

Verify Symlink

ls -la ~/.config/nvim    # Should point to dotfiles/config/nvim

Quick Reference

Current Configuration:

• Location: config/nvim/ (symlinked to ~/.config/nvim/)
• State: Empty (ready for initial setup)
• Format: Lua-based (recommended)

Standard Init Structure:

init.lua                 → Main entry point
lua/config/
  ├── options.lua        → Editor settings
  ├── keymaps.lua        → Keybindings
  ├── autocmds.lua       → Autocommands
  └── lazy.lua           → Plugin manager
lua/plugins/
  ├── colorscheme.lua    → Theme
  ├── lsp.lua            → LSP configuration
  ├── treesitter.lua     → Syntax highlighting
  └── ...                → Other plugins

Essential Commands:

• :Lazy - Plugin manager
• :Mason - LSP server installer
• :checkhealth - Diagnostic checks
• :LspInfo - LSP status
• :Telescope - Fuzzy finder

Useful Options:

• vim.opt.number - Line numbers
• vim.opt.expandtab - Spaces instead of tabs
• vim.opt.shiftwidth - Indent width
• vim.opt.termguicolors - True color support
• vim.opt.undofile - Persistent undo