Function substitute_diminished_for_dominant

mingus/core/progressions.py:398–423

(
    progression, substitute_index, ignore_suffix=False
)

def substitute_diminished_for_dominant(
    progression, substitute_index, ignore_suffix=False
):
    (roman, acc, suff) = parse_string(progression[substitute_index])
    res = []

    # Diminished progressions
    if (
        suff == "dim7"
        or suff == "dim"
        or suff == ""
        and roman in ["VII"]
        or ignore_suffix
    ):
        if suff == "":
            suff = "dim"

        # Add diminished chord
        last = roman
        for x in range(4):
            next = skip(last, 2)
            dom = skip(last, 5)
            a = interval_diff(last, dom, 8) + acc
            res.append(tuple_to_string((dom, a, "dom7")))
            last = next
    return res


def substitute(progression, substitute_index, depth=0):