int main () {
  print ("%i".printf(0));
  return 0;
}

~/git/temp 
> vala-lint vala.vala
vala.vala
    2.21    error   Expected space before paren                     space-before-paren

1 error, 0 warnings

~/git/temp [1]  
> vala-lint --fix vala.vala
No mistakes found

int main () {
  print ("%i".printf( 0));
  return 0;
}