Mapping Ctrl with equal sign

Question

I am trying to map my Ctrl and plus sign together. This is what I am trying in my vimrc:

nnoremap <C-=>    : echo "Hello" <CR>

However it seems like the mapping is not being triggered. Any suggestions on what I might be doing wrong? I am using macvim.

It seems this kind of question is getting more frequent: VIM how to map the combine key: ctrl+shift+w+, — mMontu, Jul 19 '16 at 19:57
@mMontu Yeah, it's a pretty common question. I wonder if it would be a good idea to write a canonical post on vim's internal representation of characters, termcodes, and what vim can/can't map. — DJMcMayhem, Jul 19 '16 at 20:11
See also: key bindings - How to map separate from ? - Vi and Vim Stack Exchange -- which contains an answer that works by default using modifyOtherKeys; [key bindings - Disable but keep <C-> - Vi and Vim Stack Exchange ■ key bindings - How to map Alt key? - Vi and Vim Stack Exchange — user202729, Feb 17 '23 at 02:47

score 21 · Accepted Answer · edited Oct 22 '18 at 12:33

Unfortunately, there's no reliable way of mapping Ctrl-=.

Because of the way that ctrl+key chords interact with the terminal and are represented internally, the only Ctrl-mappings that Vim is guaranteed to be able to detect are the ones defined in the ASCII standard. Here is the full list of such ctrl+key combinations, and the byte each represents.

Ctrl-@                 0x00            NUL
Ctrl-A to Ctrl-Z       0x01 to 0x1A
Ctrl-a to Ctrl-z       0x01 to 0x1A
Ctrl-[                 0x1B            ESC
Ctrl-\                 0x1C
Ctrl-]                 0x1D
Ctrl-^                 0x1E
Ctrl-_                 0x1F
Ctrl-?                 0x7F            DEL

However, note that most of these are already have a function in Vim, and some are essentially identical to/indistinguishable from other keystrokes. e.g. CTRL-M has the same keycode as Enter, so if you map either of those you are also unavoidably mapping the other.

Source: Vim-FAQ

You might be able to get around the restrictions above by configuring your terminal to send a certain byte-sequence for your mapping, like in this stack-overflow thread, but that will definitely be a pain. Personally, I'd rather just pick a different mapping.

This might eventually be fixed, but it's unlikely, since Vim relies upon the terminal it's running in. However, there's a good possibility this will work in Neovim. I don't know if that works right now or not.

Mapping Ctrl with equal sign

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