Basic Neovim Lua config

init.lua

local global  = vim.g
local option  = vim.o
local set     = vim.opt
local map     = vim.api.nvim_set_keymap

-- Set conceallevel = 0
vim.api.nvim_exec("autocmd BufEnter *.json set conceallevel=0", false)
vim.api.nvim_exec("autocmd BufEnter *.json set concealcursor=n", false)

-- Tabs Settings
set.tabstop     = 2
set.shiftwidth  = 2
set.softtabstop = 2
set.expandtab = false

-- Keymaps
map('n', '<C-j>', '<Esc>', { noremap = true })
map('i', '<C-j>', '<Esc>', { noremap = true })
map('x', '<C-j>', '<Esc>', { noremap = true })
map('c', '<C-j>', '<Esc>', { noremap = true })
map('n', '<C-x>', '<C-v>', { noremap = true })
map('n', '<C-d>', '<C-x>', { noremap = true })
map('n', '<A-j>', ':m+<CR>==', { noremap = true })
map('n', '<A-k>', ':m-2<CR>==', { noremap = true })
map('x', '<A-j>', ":m'>+<CR>gv=gv", { noremap = true })
map('x', '<A-k>', ":m-2<CR>gv=gv", { noremap = true })
map('n', '<C-p>', '<cmd>Telescope find_files<CR>', { noremap = true })
map('n', '<C-s>', '<cmd>Telescope live_grep<CR>', { noremap = true })
map('i', '<C-a>', '<Esc>I', { noremap = true })
map('i', '<C-e>', '<Esc>A', { noremap = true })

-- Settings
option.colorcolumn    = '80'
option.mouse          = 'a'
option.number         = true
option.cmdheight      = 1
option.ignorecase     = true
option.smartcase      = true
option.relativenumber = true
global.noswapfile     = true
option.undodir        = "~/.undodir"
option.undofile       = true
set.hlsearch          = false
option.completeopt    = 'menu,menuone,noselect,noinsert'

-- Telescope Config
local telescope = require('telescope')

telescope.setup{
        defaults = {
                mappings = {
                        i = {
                                ["<C-j>"] = "close",
                        }
                }
        }
}

-- Autocompletion
local cmp = require('cmp')

cmp.setup({
        mapping = {
                ['<C-n>'] = cmp.mapping.select_next_item({ behavior = cmp.SelectBehavior.Insert }),
                ['<C-p>'] = cmp.mapping.select_prev_item({ behavior = cmp.SelectBehavior.Insert }),
                ['<Down>'] = cmp.mapping.select_next_item({ behavior = cmp.SelectBehavior.Select }),
                ['<Up>'] = cmp.mapping.select_prev_item({ behavior = cmp.SelectBehavior.Select }),
                ['<C-d>'] = cmp.mapping.scroll_docs(-4),
                ['<C-f>'] = cmp.mapping.scroll_docs(4),
                ['<C-Space>'] = cmp.mapping.complete(),
                ['<C-e>'] = cmp.mapping.close(),
                ['<CR>'] = cmp.mapping.confirm({
                        behavior = cmp.ConfirmBehavior.Replace,
                        select = true,
                }),
                ['<Tab>'] = cmp.mapping(cmp.mapping.select_next_item(), { 'i', 's' }),
                ['<S-Tab>'] = cmp.mapping(cmp.mapping.select_prev_item(), { 'i', 's' })
        },
        sources = cmp.config.sources({
                { name = 'buffer'},
                { name = 'path'},
                { name = 'cmdline'},
        })
})

-- Auto Pairs
require('nvim-autopairs').setup{}

-- Commentor
require('nvim_comment').setup()

-- Plugins
vim.cmd [[packadd packer.nvim]]

return require('packer').startup(function()
        -- Telescope
        use {
                'nvim-telescope/telescope.nvim',
                requires = { {'nvim-lua/plenary.nvim'} }
        }

        -- Nvim-Cmp
        use 'hrsh7th/cmp-nvim-lsp'
        use 'hrsh7th/cmp-buffer'
        use 'hrsh7th/cmp-path'
        use 'hrsh7th/cmp-cmdline'
        use 'hrsh7th/nvim-cmp'

        -- Auto Pairs
        use 'windwp/nvim-autopairs'

        -- Commentor
        use 'terrortylor/nvim-comment'
end)