open nvim when pressing enter on empty prompt

gistfile1.txt

using REPL
using REPL: LineEdit
atreplinit() do repl
    repl.interface = REPL.setup_interface(repl)
    repl.interface.modes[1].on_enter = function (s)
        mktemp() do path, io
            input = chomp(String(take!(copy(LineEdit.buffer(s)))))
            if isempty(input)
                run(`nvim $(path)`)
                sleep(0.1)
                input = read(io, String)
                write(LineEdit.buffer(s), chomp(input))
            end
            ast = Base.parse_input_line(String(take!(copy(LineEdit.buffer(s)))), depwarn=false)
            return !(isa(ast, Expr) && ast.head === :incomplete)
        end
    end
end