function Sudowrite()
execute 'w !sudo tee "%"'
endfunction
nnoremap <Leader><Leader>w :call Sudowrite()<CR>
function MakeFileExecutable(sudo = 0)
if a:sudo
execute '! sudo chmod +x "%"'
else
execute '! chmod +x "%"'
endif
nnoremap <Leader><Leader>x :call MakeFileExecutable(0)<CR>
nnoremap <Leader><Leader>xx :call MakeFileExecutable(1)<CR>