My neovim config in lua - single file

init.lua

-- =============================================================================
-- = Utils/Functions =
-- =============================================================================

-- Global option
local o = vim.o
-- Window option
local wo = vim.wo
-- One line execution, like :h execute
local cmd = vim.cmd

-- Global keymap
local function keymap(mode, lhs, rhs, opts)
  local set_keymap, extend, default_opts = vim.api.nvim_set_keymap, vim.tbl_extend, { noremap = true, silent = true }
  if opts == nil then set_keymap(mode, lhs, rhs, default_opts)
  else set_keymap(mode, lhs, rhs, extend('force', default_opts, opts)) end
end

-- Buffer keymap
local function buf_keymap(mode, lhs, rhs, opts)
  local set_keymap, extend, default_opts = vim.api.nvim_buf_set_keymap, vim.tbl_extend, { noremap = true, silent = true }
  if opts == nil then set_keymap(mode, lhs, rhs, default_opts)
  else set_keymap(mode, lhs, rhs, extend('force', default_opts, opts)) end
end

-- Auto group
local function set_augroup(name, cmds)
  local aucmds = 'augroup ' .. name .. ' au! '
  for k, _ in pairs(cmds) do
    aucmds = aucmds .. k .. ' '
  end
  aucmds = aucmds .. 'augroup end'
  vim.api.nvim_exec(aucmds, false)
end

-- =============================================================================
-- = Auto Commands =
-- =============================================================================

set_augroup('disable_char_list', { 'au FileType help lua vim.bo.list = false' })

-- =============================================================================
-- = Plugins =
-- =============================================================================

-- Shamelessly copied from https://github.com/wbthomason/packer.nvim#bootstrapping
local install_path = vim.fn.stdpath('data') .. '/site/pack/paqs/opt/paq-nvim'
if vim.fn.empty(vim.fn.glob(install_path)) > 0 then
  cmd('!git clone https://github.com/savq/paq-nvim ' .. install_path)
end

cmd 'packadd paq-nvim'
local paq = require 'paq-nvim'.paq
paq { 'savq/paq-nvim', opt = true }

-- Core
paq 'nvim-lua/plenary.nvim'
paq 'lewis6991/gitsigns.nvim'
paq 'tpope/vim-surround'
paq 'SirVer/ultisnips'
paq 'Shougo/context_filetype.vim'
paq 'tyru/caw.vim'
paq 'editorconfig/editorconfig-vim'

-- LSP
paq 'nvim-lua/lsp-status.nvim'
paq 'hrsh7th/nvim-compe'
paq 'neovim/nvim-lspconfig'
paq 'glepnir/lspsaga.nvim'

-- Theming and Looks
paq {
  'nvim-treesitter/nvim-treesitter',
  run = function() cmd 'TSUpdate' end
}
paq 'srcery-colors/srcery-vim'
paq 'norcalli/nvim-colorizer.lua'
paq 'sheerun/vim-polyglot'

-- =============================================================================
-- = Theming and Looks =
-- =============================================================================

wo.number = true
wo.relativenumber = true
o.termguicolors = true
cmd 'colorscheme srcery'

-- =============================================================================
-- = Options =
-- =============================================================================

-- Completion options
-- Do not re-append when sourcing the file
if string.match(o.shortmess, 'c') == nil then o.shortmess = o.shortmess .. 'c' end
o.completeopt = 'menuone,noinsert,noselect'
o.updatetime = 100

-- Search options
o.ignorecase = true
o.smartcase = true
o.wrapscan = true

-- Indent options
o.tabstop = 4
o.shiftwidth = 0
o.softtabstop = 4
o.expandtab = true
o.smartindent = true

-- Line options
o.showmatch = true
o.showbreak = '+++'
o.textwidth = 120
o.scrolloff = 5
wo.linebreak = true
wo.colorcolumn = '120' -- some prefer 80, I just like to break the rules :)

-- Move swapfiles and backupfiles into ~/.cache
o.swapfile = true
o.directory = os.getenv('HOME') .. '/.cache/nvim'
o.backup = true
o.backupdir = os.getenv('HOME') .. '/.cache/nvim'

-- Undo even after closing vim
o.undofile = true
o.undodir = os.getenv('HOME') .. '/.cache/nvim'
o.undolevels = 10000
o.history = 10000

-- Enable a little bit performance
o.lazyredraw = true

-- Buffers/Tabs/Windows
o.hidden = true

-- Set spelling
o.spell = false

-- For git
wo.signcolumn = 'yes'

-- Mouse support
o.mouse = 'a'

-- Backspace behaviour
o.backspace = 'indent,eol,start'

-- Status line
o.showmode = false

-- Better display
o.cmdheight = 2

-- =============================================================================
-- = Keybindings =
-- =============================================================================

-- Leader key
vim.g.mapleader = ' '

-- Unbind default bindings for arrow keys, trust me this is for your own good
keymap('v', '<up>', '<nop>')
keymap('v', '<down>', '<nop>')
keymap('v', '<left>', '<nop>')
keymap('v', '<right>', '<nop>')
keymap('i', '<up>', '<nop>')
keymap('i', '<down>', '<nop>')
keymap('i', '<left>', '<nop>')
keymap('i', '<right>', '<nop>')

-- Map Esc, to perform quick switching between Normal and Insert mode
keymap('i', 'jk', '<ESC>')

-- Map escape from terminal input to Normal mode
keymap('i', '<ESC>', [[<C-\><C-n>]])
keymap('i', '<C-[>', [[<C-\><C-n>]])

-- Open built-in file expolorer
keymap('n', '<F3>', ':Ex<CR>')

-- Manual completion
keymap('i', '<C-Space>', '<C-x><C-o>')

-- Disable highlights
keymap('n', '<leader><CR>', ':noh<CR>')

-- Buffer maps
-- You can remap them to any other keys
keymap('n', '<leader>bl', ':buffers<CR>')
-- Go to next buffer
keymap('n', '<C-l>', ':bnext<CR>')
-- Go to previous buffer
keymap('n', '<C-h>', ':bprevious<CR>')
-- Close the current buffer
keymap('n', '<leader>bd', ':bp<BAR>sp<BAR>bn<BAR>bd<CR>')

-- Resize window panes, we can use those arrow keys
-- to help use resize windows - at least we give them some purpose
keymap('n', '<up>', ':resize +2<CR>')
keymap('n', '<down>', ':resize -2<CR>')
keymap('n', '<left>', ':vertical resize -2<CR>')
keymap('n', '<right>', ':vertical resize +2<CR>')

-- Move a line of text Alt+[j/k]
keymap('n', '<M-j>', [[mz:m+<CR>`z]])
keymap('n', '<M-k>', [[mz:m-2<CR>`z]])
keymap('v', '<M-j>', [[:m'>+<CR>`<my`>mzgv`yo`z]])
keymap('v', '<M-k>', [[:m'<-2<CR>`>my`<mzgv`yo`z]])

-- Edit vimrc and gvimrc
keymap('n', '<leader>ve', ':e $MYVIMRC<CR>')

-- Source the vimrc to reflect changes
keymap('n', '<leader>vs', ':luafile $MYVIMRC<CR>')

-- Reload file
keymap('n', '<leader>r', ':e!<CR>')

-- =============================================================================
-- = Commands =
-- =============================================================================

cmd 'command! Config edit $MYVIMRC'
cmd 'command! ConfigReload luafile $MYVIMRC'

-- There are no such thing as mistakes, only happy accidents :)
cmd 'command! -nargs=* W w'
cmd 'command! -nargs=* Wq wq'
cmd 'command! -nargs=* WQ wq'
cmd 'command! -nargs=* Q q'
cmd 'command! -nargs=* Qa qa'
cmd 'command! -nargs=* QA qa'