.gvimrc

" vim:set sts=4 sw=4 et:

set guioptions= " turn off every option

if has("gui_gtk2") || has("gui_gtk3")
    set guifont=Cascadia\ Code\ 10
elseif has("gui_win32")
    set guifont=Consolas:h10
elseif has("gui_macvim") || has("gui_vimr")
    set guifont=Monaco:h12
endif


if has("unix")
    function! FontSizePlus ()
      let l:gf_size_whole = matchstr(&guifont, '\( \)\@<=\d\+$')
      let l:gf_size_whole = l:gf_size_whole + 1
      let l:new_font_size = ' '.l:gf_size_whole
      let &guifont = substitute(&guifont, ' \d\+$', l:new_font_size, '')
    endfunction

    function! FontSizeMinus ()
        let l:gf_size_whole = matchstr(&guifont, '\( \)\@<=\d\+$')
        let l:gf_size_whole = l:gf_size_whole - 1
        let l:new_font_size = ' '.l:gf_size_whole
        let &guifont = substitute(&guifont, ' \d\+$', l:new_font_size, '')
    endfunction
else
    function! FontSizePlus ()
        let l:gf_size_whole = matchstr(&guifont, '\(:h\)\@<=\d\+$')
        let l:gf_size_whole = l:gf_size_whole + 1
        let l:new_font_size = ':h'.l:gf_size_whole
        let &guifont = substitute(&guifont, ':h\d\+$', l:new_font_size, '')
    endfunction

    function! FontSizeMinus ()
        let l:gf_size_whole = matchstr(&guifont, '\(:h\)\@<=\d\+$')
        let l:gf_size_whole = l:gf_size_whole - 1
        let l:new_font_size = ':h'.l:gf_size_whole
        let &guifont = substitute(&guifont, ':h\d\+$', l:new_font_size, '')
    endfunction
endif

nmap <C-_> :call FontSizeMinus()<CR>
nmap <C-=> :call FontSizePlus()<CR>