How to merge vim commandline and statusline

in vim, the command line always at the bottom. and the above is statusline (if display).

status line could formated powerful. it's cool but wast a line.

so, here is my question: can i merge the statusline to commandline (not use ruler):

• normal mode. display statusline
• command typing. replace with(or switch to) commandline and ruler display.

No, not without modifying Vim's source code.