According to the Emacs tutorial:Type M-x auto-fill-mode  now.  Then insert a line of asdf      over again until you see it divide into two lines.  You must put in     spaces between them because Auto Fill breaks lines only at spaces.In other words, Emacs will automatically create a new line after a certain threshold.How do I do the same in Vim, and how can I do this with already written text?
Emulate Emacs' auto-fill-mode
autocompletion