Basic Neovim config to get started

init.lua

-------------------- HELPERS -------------------------------
local cmd = vim.cmd  -- to execute Vim commands e.g. cmd('pwd')
local fn = vim.fn    -- to call Vim functions e.g. fn.bufnr()
local g = vim.g      -- a table to access global variables
local opt = vim.opt  -- to set options

local function map(mode, lhs, rhs, opts)
  local options = {noremap = true}
  if opts then options = vim.tbl_extend('force', options, opts) end
  vim.api.nvim_set_keymap(mode, lhs, rhs, options)
end

-------------------- PLUGINS -------------------------------
cmd 'packadd paq-nvim'               -- load the package manager
local paq = require('paq-nvim').paq  -- a convenient alias
paq {'savq/paq-nvim', opt = true}    -- paq-nvim manages itself
paq {'nvim-treesitter/nvim-treesitter'}
paq {'neoclide/coc.nvim', branch='release'}
paq {'nvim-telescope/telescope.nvim'}
paq {'nvim-lua/plenary.nvim'}
paq {'nvim-lua/popup.nvim'}
paq {'kyazdani42/nvim-tree.lua'}
paq {'kyazdani42/nvim-web-devicons'}
paq {'navarasu/onedark.nvim'}
paq {'sakhnik/nvim-gdb'}
-------------------- OPTIONS -------------------------------
cmd 'colorscheme onedark'            -- Put your favorite colorscheme here
opt.completeopt = {'menuone', 'noinsert', 'noselect'}  -- Completion options (for deoplete)
opt.expandtab = true                -- Use spaces instead of tabs
opt.hidden = true                   -- Enable background buffers
opt.ignorecase = true               -- Ignore case
opt.joinspaces = false              -- No double spaces with join
opt.list = true                     -- Show some invisible characters
opt.number = true                   -- Show line numbers
opt.relativenumber = true           -- Relative line numbers
opt.scrolloff = 4                   -- Lines of context
opt.shiftround = true               -- Round indent
opt.shiftwidth = 4                  -- Size of an indent
opt.sidescrolloff = 8               -- Columns of context
opt.smartcase = true                -- Do not ignore case with capitals
opt.smartindent = true              -- Insert indents automatically
opt.splitbelow = true               -- Put new windows below current
opt.splitright = true               -- Put new windows right of current
opt.tabstop = 4                     -- Number of spaces tabs count for
opt.termguicolors = true            -- True color support
opt.wildmode = {'list', 'longest'}  -- Command-line completion mode
opt.wrap = false                    -- Disable line wrap

-------------------- MAPPINGS ------------------------------
cmd 'let mapleader = ","'         -- comma as leader key
map('n', 'zz', ':up<CR>')         -- save file
map('', '<leader>c', '"+y')       -- Copy to clipboard in normal, visual, select and operator modes
map('i', '<C-u>', '<C-g>u<C-u>')  -- Make <C-u> undo-friendly
map('i', '<C-w>', '<C-g>u<C-w>')  -- Make <C-w> undo-friendly

-- <Tab> to navigate the completion menu
map('i', '<S-Tab>', 'pumvisible() ? "\\<C-p>" : "\\<Tab>"', {expr = true})
map('i', '<Tab>', 'pumvisible() ? "\\<C-n>" : "\\<Tab>"', {expr = true})

-- Resize with arrows
map('n', '<C-Up>', ':resize +2<CR>')
map('n', '<C-Down>', ':resize -2<CR>')
map('n', '<C-Left>', ':vertical resize -2<CR>')
map('n', '<C-Right>', ':vertical resize +2<CR>')

-- Move text up and down
map("n", "<A-Down>", "<Esc>:m .+1<CR>==gi")
map("n", "<A-Up>", "<Esc>:m .-2<CR>==gi")

map("v", "<A-Down>", ":m .+1<CR>==")
map("v", "<A-Up>", ":m .-2<CR>==")
map("v", "p", '"_dP')

-- Visual Block --
-- Move text up and down
map("x", "J", ":move '>+1<CR>gv-gv")
map("x", "K", ":move '<-2<CR>gv-gv")
map("x", "<A-Down>", ":move '>+1<CR>gv-gv")
map("x", "<A-Up>", ":move '<-2<CR>gv-gv")

map('n', '<C-l>', '<cmd>noh<CR>')    -- Clear highlights
map('n', '<leader>o', 'm`o<Esc>``')  -- Insert a newline in normal mode

---nvim-tree-mappings-------------------
map('n', '<leader>n', ':NvimTreeToggle<CR>')    -- open/close
map('n', '<leader>r', ':NvimTreeRefresh<CR>')   -- refresh
--------------------------------NVIM-Tree-Options---------------------------
g.nvim_tree_width = 30
g.nvim_tree_ignore = {'.git', 'node_modules', '.cache'}
g.nvim_tree_gitignore = 1
g.nvim_tree_auto_open = 1
g.nvim_tree_indent_markers = 1
g.nvim_tree_hide_dotfiles = 1
g.nvim_tree_git_hl = 1
g.nvim_tree_width_allow_resize  = 1
g.nvim_tree_special_files = {'README.md', 'Makefile', 'MAKEFILE'}
g.nvim_tree_show_icons = {
    git = 1,
    folders = 1,
    files = 1
}
g.nvim_tree_icons = {
    default = "‣ ",
    symlink = " ",
    git = {
            unstaged = "✗",
            staged = "✓",
            unmerged = "",
            renamed = "➜",
            untracked = "★"
    },
    folder = {
            default = "",
            open = "",
            symlink = ""
    }
}