config: nvim: rewrite config in lua and use packer as plugin manager

config/nvim/lua/general.lua

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+-- reduce boilerplate by defining some shortcuts
+local opt = vim.opt
+local cmd = vim.cmd
+local autocmd = vim.api.nvim_create_autocmd
+
+--------------------
+-- General
+--------------------
+opt.mouse = 'n'               -- enable mouse support in normal mode
+opt.clipboard = 'unnamedplus' -- copy/paste to and from system clipboard
+
+opt.wildmode = 'list:longest,full'
+opt.wildignorecase = true
+opt.wildignore = '*.o,*.d,*.so,*.class,*.aux,*.log,*.out,*.toc,*.pdf,*.pyc'
+
+opt.fileformats = 'unix,dos'  -- use identical lineendings for all platforms
+opt.secure = true             -- disable autocmd for security reasons
+
+--------------------
+-- Tabs
+--------------------
+opt.tabstop = 4               -- 1 tab == N spaces
+opt.shiftwidth = 4            -- shift N spaces when pressing tab
+opt.smartindent = true        -- take syntax into account for applying indentation
+
+--------------------
+-- Search
+--------------------
+opt.ignorecase = true         -- ignore capitalization on search
+opt.smartcase = true          -- ignore capitalication unless word contains a capital
+
+opt.iskeyword:append '-'      -- treat hyphenated words as a single word
+
+--------------------
+-- Neovim UI
+--------------------
+opt.number = true             -- line numbers
+opt.ruler = true              -- cursor position in statusbar
+opt.showtabline = 2           -- always show vim tabs
+opt.showcmd = true            -- display currently typed command
+opt.termguicolors = true      -- enable 24-bit RGB color
+
+-- highlight line at which the cursor is positioned
+opt.cursorline = true
+cmd 'highlight CursorLine term=bold cterm=bold'
+cmd 'highlight CursorLineNR term=bold cterm=bold ctermbg=darkgrey'
+
+-- display warning column at 81 and 121
+opt.colorcolumn = '81,121'
+cmd 'highlight ColorColumn ctermbg=235 guibg=#2d2d2d'
+
+opt.splitright = true         -- horizontal split to the right
+opt.splitbelow = true         -- vertical split to the bottom
+
+-- define characters to display when using 'set list'
+opt.listchars = 'tab:→ ,trail:∙,eol:¬,extends:❯,precedes:❮,nbsp:␣'
+
+--------------------
+-- Performance
+--------------------
+opt.hidden = true             -- allow buffers with changes to be hidden
+opt.updatetime = 300          -- delay (in ms) to wait before triggering event
+opt.timeoutlen = 500          -- time (in ms) to wait for event to complete
+opt.history = 10000           -- remember N lines of history
+
+--------------------
+-- Misc
+--------------------
+
+-- remove redundant whitespaces on save
+autocmd('BufWritePre', {
+	pattern = '*',
+	command = ':%s/\\s\\+$//e'
+})

config/nvim/lua/keybindings.lua

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+local map = require('utils').map -- import map
+
+-- allow switching between buffers using tab and Shift-tab
+map('n', '<TAB>', ':bnext<CR>')
+map('n', '<S-TAB>', ':bprevious<CR>')

config/nvim/lua/plugins.lua

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+--------------------
+-- Packer Bootstrap
+--------------------
+local packer_installed, _ = pcall(require, 'packer')
+local packer_bootstrap = false
+if (not packer_installed) then
+	-- ask user whether packer should be bootstrapped
+	packer_bootstrap = require('utils').prompt(
+		'Plugin manager packer not found. Install it now?',
+		'Bootstrapping packer now...',
+		'Skipping setup of packer and plugins.')
+
+	if (not packer_bootstrap) then
+		return
+	end
+
+	-- perform actual bootstrap
+	local fn = vim.fn
+	local install_path = fn.stdpath('data') .. '/site/pack/packer/start/packer.nvim'
+	fn.system({'git', 'clone', '--depth', '1', 'https://github.com/wbthomason/packer.nvim', install_path})
+	vim.cmd('packadd packer.nvim')
+end
+
+-- helper function to be used `config` parameter of packer's use to externalize
+-- plugin configuration, expects the name of the config file
+function load_config(name)
+  return string.format('require("plugins/%s")', name)
+end
+
+return require('packer').startup({
+	function(use)
+		use 'wbthomason/packer.nvim'
+
+		--------------------
+		-- Visuals
+		--------------------
+		use { -- colorblind-friendly colorscheme
+			'romainl/vim-dichromatic',
+			config = function() vim.cmd('colorscheme dichromatic') end,
+		}
+		use { -- color highlighter
+			'norcalli/nvim-colorizer.lua',
+			config = function() require('colorizer').setup() end,
+		}
+
+		-- Automatically set up your configuration after cloning packer.nvim
+		-- Put this at the end after all plugins
+		if packer_bootstrap then
+			require('packer').sync()
+		end
+	end,
+	config = {
+		display = {
+			open_fn = require("packer.util").float,
+		},
+		profile = {
+			enable = true,
+			threshold = 1, -- the amount in ms that a plugins load time must be over for it to be included in the profile
+		},
+	},
+})

config/nvim/lua/utils.lua

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+local M = {}
+
+-- keybinding mapper
+function M.map(mode, lhs, rhs, opts)
+	local options = { noremap = true, silent = true }
+	if opts then
+		options = vim.tbl_extend('force', options, opts)
+	end
+	vim.api.nvim_set_keymap(mode, lhs, rhs, options)
+end
+
+-- simple prompt
+function M.prompt(msg, accept_msg, deny_msg)
+	local answer = vim.fn.input(msg .. ' (YES/no) ')
+	while(true) do
+		-- clear vim cmdline before printing anything
+		vim.cmd('mode')
+		if answer == 'YES' then
+			print(accept_msg)
+			return true
+		elseif string.lower(answer) == 'no' then
+			print(deny_msg)
+			return false
+		end
+		-- re-request user input
+		answer = vim.fn.input('Please retry: ' .. msg .. ' (YES/no) ')
+	end
+end
+
+return M