Prefer iglob instead of glob

preferIGlob.ql

/**
 * @name Prefer iglob
 * @description Use iglob instead of glob
 * @kind problem
 * @tags speed
 * @problem.severity recommendation
 * @sub-severity low
 * @precision high
 * @id py/use-iglob
 */
import python

predicate is_glob(Call call) {
  call.getFunc().pointsTo(Value::named("glob.glob"))
}

from AstNode node
where 
	is_glob(node.(For).getIter().(Call)) or
	is_glob(node.(ListComp).getIterable()) or
	is_glob(node.(SetComp).getIterable()) or
	is_glob(node.(DictComp).getIterable()) or
	is_glob(node.(GeneratorExp).getIterable())
select node, "Prefer `iglob` to `glob`"