nvim: Add function to disable line numbering.

nvim/init.lua

@@ -4,9 +4,17 @@ vim.env.SHELL = "/bin/bash"
 -- disable mouse
 vim.opt.mouse = ""
 
--- line numbering
-vim.opt.number = true
-vim.opt.relativenumber = true
+vim.g.linenumbers = true
+vim.opt.number = vim.g.linenumbers
+vim.opt.relativenumber = vim.g.linenumbers
+
+function toggle_line_numbering()
+	vim.g.linenumbers = not vim.g.linenumbers
+	vim.opt.number = vim.g.linenumbers
+	vim.opt.relativenumber = vim.g.linenumbers
+end
+
+vim.keymap.set("n", "ä", ":lua toggle_line_numbering()<CR>")
 
 vim.opt.encoding = "utf-8"
 vim.opt.fileencoding = "utf-8"