ajs-nvim/lua/keymaps.lua

function map(mode, lhs, rhs, opts)
	local options = { noremap = true, silent = true }
	if opts then
		options = vim.tbl_extend("force", options, opts)
	end
	vim.keymap.set(mode, lhs, rhs, options)
end
--This code just maps vim.keymap.set() to something easier to type. Also, typing { noremap = true, silent = true } won’t be needed, because that is also implemented in the function.

vim.g.mapleader = " "

map("i", "jk", "<esc>") -- remap escape

map("n", "<leader>+", ":bNext<cr>") --switch tabs
map("n", "<leader>n", ":Neotree toggle<cr>") --open Nerdtree
map("n", "<leader>z", ":ZenMode<cr>") --open ZenMode (distraction-free)
map("n", "<leader>d", ":ToggleDiag<cr>") -- toggle all diagnostics

vim.api.nvim_create_autocmd("LspAttach", {
	desc = "LSP actions",
	callback = function()
		local bufmap = function(mode, lhs, rhs)
			local opts = { buffer = true }
			vim.keymap.set(mode, lhs, rhs, opts)
		end

		-- Displays hover information about the symbol under the cursor
		bufmap("n", "K", "<cmd>lua vim.lsp.buf.hover()<cr>")

		-- Jump to the definition
		bufmap("n", "gd", "<cmd>lua vim.lsp.buf.definition()<cr>")

		-- Jump to declaration
		bufmap("n", "gD", "<cmd>lua vim.lsp.buf.declaration()<cr>")

		-- Lists all the implementations for the symbol under the cursor
		bufmap("n", "gi", "<cmd>lua vim.lsp.buf.implementation()<cr>")

		-- Jumps to the definition of the type symbol
		bufmap("n", "go", "<cmd>lua vim.lsp.buf.type_definition()<cr>")

		-- Lists all the references
		bufmap("n", "gr", "<cmd>lua vim.lsp.buf.references()<cr>")

		-- Displays a function's signature information
		bufmap("n", "gs", "<cmd>lua vim.lsp.buf.signature_help()<cr>")

		-- Renames all references to the symbol under the cursor
		bufmap("n", "<F2>", "<cmd>lua vim.lsp.buf.rename()<cr>")

		-- Selects a code action available at the current cursor position
		bufmap("n", "<F4>", "<cmd>lua vim.lsp.buf.code_action()<cr>")

		-- Show diagnostics in a floating window
		bufmap("n", "gl", "<cmd>lua vim.diagnostic.open_float()<cr>")

		-- Move to the previous diagnostic
		bufmap("n", "[d", "<cmd>lua vim.diagnostic.goto_prev()<cr>")

		-- Move to the next diagnostic
		bufmap("n", "]d", "<cmd>lua vim.diagnostic.goto_next()<cr>")
	end,
})