awesome-dump-props.lua

-- Near the top of rc.lua:

local guieditor = "/usr/bin/gedit" -- if you haven't already defined something

do
	local useful_props = {
		"type", "name", "role", "class", "instance", "machine", "icon_name", "screen";
		"skip_taskbar", "pid";
		"startup_id", "window", "group_window", "leader_window";
	}
	function dump_props(c)
		c = c or client.focus;
		if not c then return "no client"; end
		local props = {};
		for _, prop in ipairs(useful_props) do
			props[prop] = c[prop];
		end
		return gears.debug.dump_return(props);
	end
	function dump_mouseover_props()
		local prop_string = dump_props(mouse.object_under_pointer());
		local tmpfile = os.tmpname();
		local f = io.open(tmpfile, "w+");
		if f then
			f:write(prop_string, "\n");
			f:flush();
			f:close();
			awful.spawn({guieditor, tmpfile});
		end
	end
end

-- Example keybinding:
    awful.key({ modkey, "Control" }, "p", dump_mouseover_props,
              {description = "dump properties of client under cursor", group = "debug"}),