how to copy editing file in same location but different name with VIM

I am trying to find a combinati开发者_StackOverflow社区on of commands, macro or a plugin to copy the file I am editing in VIM (actually macvim) to the same location but with a different name. I am sure this could be achieved with a simple:

 !cp $CURRENT_FILE_PATH $NEW_PATH

but I don't know what variables to use nor the syntax.

:saveas %:p:h/new_name

For more information:

:h :saveas

:!cp % %:h/new_name

• % expands to the current filename
• %:h expands to the current filename's directory

To learn more:

• :help expand()
• :help filename-modifiers