[neovim] Disabled arrows, backspace and delete

nvim/lua/missingcharacter/remap.lua

@@ -48,3 +48,26 @@ end)
 
 -- F3 toggles paste mode
 vim.keymap.set("n", "<F3>", "<cmd>set paste!<CR>")
+
+-- Disable arrow keys in normal and insert mode
+local hardmode = true
+if hardmode then
+    -- Show an error message if a disabled key is pressed
+    local msg = [[<cmd>echohl Error | echo "KEY DISABLED" | echohl None<CR>]]
+
+    -- Disable arrow keys in insert mode with a styled message
+    vim.api.nvim_set_keymap("i", "<Up>", "<C-o>" .. msg, { noremap = true, silent = false })
+    vim.api.nvim_set_keymap("i", "<Down>", "<C-o>" .. msg, { noremap = true, silent = false })
+    vim.api.nvim_set_keymap("i", "<Left>", "<C-o>" .. msg, { noremap = true, silent = false })
+    vim.api.nvim_set_keymap("i", "<Right>", "<C-o>" .. msg, { noremap = true, silent = false })
+    vim.api.nvim_set_keymap("i", "<Del>", "<C-o>" .. msg, { noremap = true, silent = false })
+    vim.api.nvim_set_keymap("i", "<BS>", "<C-o>" .. msg, { noremap = true, silent = false })
+
+    -- Disable arrow keys in normal mode with a styled message
+    vim.api.nvim_set_keymap("n", "<Up>", msg, { noremap = true, silent = false })
+    vim.api.nvim_set_keymap("n", "<Down>", msg, { noremap = true, silent = false })
+    vim.api.nvim_set_keymap("n", "<Left>", msg, { noremap = true, silent = false })
+    vim.api.nvim_set_keymap("n", "<Right>", msg, { noremap = true, silent = false })
+    vim.api.nvim_set_keymap("n", "<Del>", msg, { noremap = true, silent = false })
+    vim.api.nvim_set_keymap("n", "<BS>", msg, { noremap = true, silent = false })
+end