How to map Shift-Enter

I am trying to customize the behaviour of Enter key in Normal mode in Vim. Here is my .vimrc:

nmap <CR> o<Esc>
nmap <S-CR> i<CR><Esc>

I am trying to make Enter simply append a newline after the current line when pressed. However, when the Shift-Enter combination is pressed, I want to break the current line at the cursor.

The latter does not work. Whenever I press Shift-Enter it just appends a line without breaking it at the cursor.

I managed to correct my terminal key-code for Shift+Enter by sending the key-code Vim apparently expects. Depending on your terminal, (Adding Ctrl+Enter as a bonus!)

iTerm2

For a single Profile open Preferences → Profiles → Keys → [+] (Add)
For all profiles open Preferences → Keys → [+] (Add)

• Keyboard shortcut: (Hit Shift+Enter)

• Action: Send Escape Sequence

• Esc+ [13;2u

  Repeat for Ctrl+Enter, with sequence: [13;5u

urxvt, append to your .Xresources file:

URxvt.keysym.S-Return:     \033[13;2u
URxvt.keysym.C-Return:     \033[13;5u

Alacritty, under key_bindings, add following to your ~/.config/alacritty/alacritty.yml:

- { key: Return,   mods: Shift,   chars: "\x1b[13;2u" }
- { key: Return,   mods: Control, chars: "\x1b[13;5u" }

Kitty, in ~/.config/kitty/kitty.conf:

map shift+enter send_text all \x1b[13;2u
map ctrl+enter send_text all \x1b[13;5u

Due to the way that the keyboard input is handled internally, this unfortunately isn't generally possible today in the terminal version of Vim (<S-CR> should work in GVIM on all platforms, and in the Windows console Vim). This is a known pain point, and the subject of various discussions on vim_dev and the #vim IRC channel.

Some people (foremost Paul LeoNerd Evans) want to fix that (even for console Vim in terminals that support this), and have floated various proposals, cp. http://groups.google.com/group/vim_dev/browse_thread/thread/626e83fa4588b32a/bfbcb22f37a8a1f8

But as of today, no patches or volunteers have yet come forward, though many have expressed a desire to have this in a future Vim 8 major release.

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Note on mapping <CR>:

If you map <CR> in normal mode, it'll interfere with selection of history items in the command-line window and with jumping to error under cursor in quickfix/location list windows! (Unless you add the following:)

:autocmd CmdwinEnter * nnoremap <CR> <CR>
:autocmd BufReadPost quickfix nnoremap <CR> <CR>

Note on :nmap:

You should use :noremap; it makes the mapping immune to remapping and recursion.

I also wanted to map <S-CR> and found that I couldn't get it to work in CLI mode until I added a second mapping using Ctrl+V then <Shift+Enter> for the mapped keystroke. The <S-CR> mapping is still needed for GVIm to work as expected, however. This would render the your .vimrc snippet as follows:

nnoremap <CR> o<Esc>
nnoremap <S-CR> i<CR><Esc> " Needed for GVIm
nnoremap ^[0M i<CR><Esc>   " Needed for CLI VIm (Note: ^[0M was created with Ctrl+V Shift+Enter, don't type it directly)

I tested this on Ubuntu 12.04. Happy Vimming!

You can't map <S-CR> in CLI Vim, no matter how hard you try, because Vim can't distinguish <S-CR> from <CR>.

You must find another mapping or stick with GVim/MacVim.

edit

Some terminal emulators, like iTerm.app or Terminal.app on Mac OS X, allow you to set up shortcuts to send specific characters sequences to the shell. If you have that possibility it may be worth a try but you'll quickly get used to a platform-specific gyzmo that can't be ported so, well… I don't really recommend it.

Ingo Karkat and romainl are 100% correct. However what you are asking is common so I want to give you some options.

I personally recommend using Tim Pope's Unimpaired plugin. It provides many mappings but the ones you will looking for are [<space> and ]<space> which create blank lines above and below the current line respectively. Unimpaired also provides nice mappings for moving through the quickfix list, buffer list, option toggling, and many others. See :h unimpaired for more.

If you do not want to use unimpaired plugin but like the mappings below are some quick mappings to put in your ~/.vimrc file:

nnoremap <silent> [<space>  :<c-u>put!=repeat([''],v:count)<bar>']+1<cr>
nnoremap <silent> ]<space>  :<c-u>put =repeat([''],v:count)<bar>'[-1<cr>