Neovim: Add config, switch to it from Vim

.config/nvim/lua/core/autocommands.lua

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+--------------------------------------------
+--- Commands ---
+
+-- Prevent typo
+vim.cmd [[
+	cnoreabbrev <expr> W (getcmdtype() is# ":" && getcmdline() is# "W") ? ("w") : ("W")
+	cnoreabbrev <expr> Q (getcmdtype() is# ":" && getcmdline() is# "Q") ? ("q") : ("Q")
+	cnoreabbrev <expr> WQ (getcmdtype() is# ":" && getcmdline() is# "WQ") ? ("wq") : ("WQ")
+	cnoreabbrev <expr> Wq (getcmdtype() is# ":" && getcmdline() is# "Wq") ? ("wq") : ("Wq")
+]]
+
+--------------------------------------------
+--- Autocommands ---
+
+-- Cut off trailing whitespace and trailing blank lines
+local core = require("core.functions")
+vim.api.nvim_create_autocmd({ "BufWritePre" }, {
+	pattern = "*",
+	callback = core.trim_buffer,
+})
+
+-- Highlight on yank
+--  See `:help vim.highlight.on_yank()`
+local highlight_group = vim.api.nvim_create_augroup("YankHighlight", { clear = true })
+vim.api.nvim_create_autocmd("TextYankPost", {
+	pattern = "*",
+	group = highlight_group,
+	callback = function() vim.highlight.on_yank() end,
+})

.config/nvim/lua/core/config.lua

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+--- Behavior ---
+
+-- vim.opt.autochdir = true
+vim.opt.clipboard = "unnamedplus"
+vim.opt.encoding = "utf-8"
+vim.opt.fileencoding = "utf-8"
+vim.opt.mouse = "a"
+vim.opt.scrolloff = 8
+vim.opt.signcolumn = "yes" -- always show gutter/fringe
+vim.opt.ttimeoutlen = 0
+
+-- Case-insensitive searching UNLESS \C or capital in search
+vim.opt.ignorecase = true
+vim.opt.smartcase = true
+
+--- Editing ---
+
+vim.opt.number = true
+vim.opt.breakindent = true
+
+vim.opt.backspace = "indent,eol,start"
+vim.opt.expandtab = false
+vim.opt.shiftround = true
+vim.opt.shiftwidth = 4
+vim.opt.softtabstop = 4
+vim.opt.tabstop = 4
+
+vim.opt.smartindent = true
+
+vim.opt.wrap = false
+
+--- Files
+
+vim.opt.backup = true
+vim.opt.backupdir = vim.fn.stdpath("cache") .. "/backup"
+vim.opt.swapfile = false
+vim.opt.undofile = true
+vim.opt.undodir = vim.fn.stdpath("cache") .. "/undodir"
+
+vim.opt.shadafile = vim.fn.stdpath("cache") .. "/netrwhist"
+
+--- UI ---
+
+vim.opt.colorcolumn = "81"
+vim.opt.completeopt = "menuone,noselect"
+vim.opt.cursorline = true
+vim.opt.termguicolors = true
+vim.opt.title = true

.config/nvim/lua/core/functions.lua

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+local M = {}
+
+M.is_buffer_a_file = function()
+	local buffer_name = vim.fn.bufname()
+
+	return buffer_name ~= "" and vim.fn.filereadable(buffer_name) == 1
+end
+
+M.get_file_path = function()
+	if not M.is_buffer_a_file() then
+		return nil
+	end
+	local file_path = vim.fn.expand("%:p")
+
+	return vim.fn.fnamemodify(file_path, ":h") .. "/"
+end
+
+M.get_netrw_path = function() -- b:netrw_curdir
+	if vim.fn.expand("#" .. vim.fn.bufnr()) == "0" then
+		return nil
+	end
+
+	return vim.fn.fnamemodify(vim.fn.bufname(), ":p")
+end
+
+M.get_current_directory = function()
+	return M.get_file_path() or M.get_netrw_path() or vim.fn.getcwd()
+end
+
+M.find_project_root = function()
+	local current_directory = M.get_current_directory()
+
+	local directory = current_directory
+	while directory ~= "/" do
+		local git_directory = directory .. "/.git"
+		local project_file = directory .. "/.project"
+
+		if vim.fn.isdirectory(git_directory) == 1 or vim.fn.filereadable(project_file) == 1 then
+			return directory
+		end
+
+		directory = vim.fn.fnamemodify(directory, ":h")
+	end
+
+	return nil, current_directory
+end
+
+-- This will merge tables with index-value pairs and keep the unique values
+M.table_merge_unique = function(...)
+	local result = {}
+	local seen_values = {}
+	for _, value in ipairs(vim.tbl_flatten(...)) do
+		if not seen_values[value] then
+			seen_values[value] = true
+			table.insert(result, value)
+		end
+	end
+
+	return result
+end
+
+-- Cut off trailing whitespace and trailing blank lines
+-- https://vi.stackexchange.com/questions/37421/how-to-remove-neovim-trailing-white-space
+-- https://stackoverflow.com/questions/7495932/how-can-i-trim-blank-lines-at-the-end-of-file-in-vim
+M.trim_buffer = function()
+	local save_cursor = vim.fn.getpos(".")
+	pcall(function() vim.cmd([[%s/\s\+$//e]]) end)
+	pcall(function() vim.cmd([[%s#\($\n\s*\)\+\%$##]]) end)
+	vim.fn.setpos(".", save_cursor)
+end
+
+return M

.config/nvim/lua/core/globals.lua

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+-- Usage:
+--   :lua P("Hello World!")
+P = function(v)
+	print(vim.inspect(v))
+	return v
+end
+
+RELOAD = function(...)
+	return require("plenary.reload").reload_module(...)
+end
+
+R = function(name)
+	RELOAD(name)
+	return require(name)
+end
+
+LOG = function(v)
+	vim.fn.writefile({ vim.inspect(v) }, "/tmp/nvim-log", "a")
+end

.config/nvim/lua/core/leader-key.lua

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+-- Set <space> as the leader key
+-- See `:help mapleader`
+--  NOTE: Must happen before plugins are required (otherwise wrong leader will be used)
+vim.keymap.set({ "n", "v" }, "<Space>", "<Nop>", { silent = true })
+vim.g.mapleader = " "
+vim.g.maplocalleader = " "