Turning off auto indent when pasting text into vim

I usually use :r! cat and then paste ( shift + insert ) the content, and CTRL+D.

No need to enable & disable, direct usage.

To avoid undesired effects while pasting, there is an option that needs to be set:

set paste

A useful command to have in your .vimrc is set pastetoggle=<F10> or some other button, to easily toggle between paste and nopaste.

Update: Better answer here: https://stackoverflow.com/a/38258720/62202

To turn off autoindent when you paste code, there's a special "paste" mode.

Type

:set paste

Then paste your code. Note that the text in the tooltip now says -- INSERT (paste) --.

After you pasted your code, turn off the paste-mode, so that auto-indenting when you type works correctly again.

:set nopaste

However, I always found that cumbersome. That's why I map <F3> such that it can switch between paste and nopaste modes while editing the text! I add this to .vimrc

set pastetoggle=<F3>