How to map {Ctrl 0,-,=} keys in vim?
keyboard-shortcuts, mapping, ubuntu-12.04, vim
Solution
Notice how in command-line mode, Ctrl-_ results in `^_`, but Ctrl-0 and Ctrl-= yield nothing.
Due to the way that the keyboard input is handled internally, differentiating this as well as many other key combinations (like Ctrl+Letter vs. Ctrl+Shift+Letter) unfortunately isn't possible today, even in GVIM. 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. link
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.
Problem
My keyboard's layout(2nd row): `1...0-=Backspace I want to map function calls to Ctrl+ 0, -, =. This is the function I created: ``` " it doesn't work nnoremap <C-=> :call IncFontSize(+1)<CR> " it works nnoremap <C--> :call IncFontSize(-1)<CR> " it doesn't work nnoremap <C-0> :call IncFontSize(0)<CR> fun! IncFontSize(inc) if !exists('+guifont') return endif let s:defaultfont = 'Ubuntu Mono 12' if a:inc==0 || empty(&guifont) let &guifont = s:defaultfont return endif let &guifont = substitute(&guifont, '\d\+$', '\=submatch(0)+'.a:inc, '') endfun ``` How can I map function calls to these keys?