Auto enter insert mode when input field focused on page load in luakit

auto_insert.lua

------------------------------------------------------------------
-- Auto enter insert mode when input field focused on page load --
-- (C) 2011 Mason Larobina <mason.larobina@gmail.com>           --
------------------------------------------------------------------

local is_editable = [=[
(function () {
    var e = document.activeElement;
    // we might get a window object if the main frame was focused
    if (!e || !e.tagName) {
        return false;
    }
    var name = e.tagName.toLowerCase();
    if (name === "textarea" || name === "select") {
        return true;
    }
    if (name === "input") {
        var type = e.type.toLowerCase();
        if (type === 'text' || type === 'search' || type === 'password') {
            return true;
        }
    }
    return false;
})();
]=]

webview.init_funcs.auto_insert = function (view, w)
    view:add_signal("load-status", function (v, status)
        if status == "finished" then
            if view:eval_js(is_editable) == "true" then
                w:set_mode("insert")
            end
        end
    end)
end