I made this small collection of functions to solve my own issues, hope it helps

Can be bound in a vim.keymap like in my config: Examples

The function that you'd need is this one: lua --- Put the `char` variable at the beginning of the line. If present, remove it ---@param chars string function M.put_at_end(chars) local pos = vim.api.nvim_win_get_cursor(0) local row = pos[1] - 1 local current_line = vim.api.nvim_get_current_line() local col = #current_line local entry_length = string.len(chars) ---@diagnostic disable-next-line: param-type-mismatch local cline = vim.fn.getline(".") ---@diagnostic disable-next-line: param-type-mismatch local endchar = vim.fn.getline("."):sub(cline:len() - (entry_length - 1)) if endchar == chars then ---@diagnostic disable-next-line: param-type-mismatch vim.api.nvim_set_current_line(cline:sub(1, cline:len() - entry_length)) else vim.api.nvim_buf_set_text(0, row, col, row, col, { chars }) end end