toggle between working mode and presentation mode (for projection demo)

PresentationMode.vim

" toggle between working mode and presentation mode

function! PresentationModeOn()
  set background=light
  colorscheme github
  set guifont=Monaco\ for\ Powerline:h28.00
endfunction

function! PresentationModeOff()
  set background=dark
  colorscheme solarized
  set guifont=Monaco\ for\ Powerline:h18.00
endfunction

function! TogglePresentationMode()
  if !exists('w:present')
    let w:present=0
  endif

  if w:present==0
    call PresentationModeOn()
    let w:present=1
  else
    call PresentationModeOff()
    let w:present=0
  endif
endfunction

map <leader>P :call TogglePresentationMode()<CR>