Merge "Add mksubst" am: cfaa04b9

        was_space = is_space

    return result

def _mksubst(old, new, s):

    """Emulates Make's subst.

    Replaces each occurence of 'old' with 'new'.

    If 's' is a list, applies substitution to each item.

    """

    if type(s) == "list":

        return [e.replace(old, new) for e in s]

    return s.replace(old, new)

def __get_options():

    """Returns struct containing runtime global settings."""

    settings = dict(

    mkerror = _mkerror,

    mkwarning = _mkwarning,

    mkstrip = _mkstrip,

    mksubst = _mksubst,

    printvars = _printvars,

    product_configuration = _product_configuration,

    require_artifacts_in_path = _require_artifacts_in_path,

assert_eq("", rblf.mkstrip(" \n \t    "))

assert_eq("a b c", rblf.mkstrip("  a b   \n  c \t"))

assert_eq("b1 b2", rblf.mksubst("a", "b", "a1 a2"))

assert_eq(["b1", "x2"], rblf.mksubst("a", "b", ["a1", "x2"]))

globals, config = rblf.product_configuration("test/device", init)

assert_eq(

    {