def test_fret_span_should_count_played_strings(self):
frets = (2, 2, 3, 3, 5, 5)
expected_result = 3
result = fret_span(frets)
self.assertEquals(result, expected_result)
def test_fret_span_should_not_count_unplayed_strings(self):
frets = (None, 2, 3, 4, None, None)
expected_result = 2
result = fret_span(frets)
self.assertEquals(result, expected_result)
def test_fret_span_should_not_count_open_notes(self):
frets = (0, 1, 1, 2, 2, 3)
expected_result = 2
result = fret_span(frets)
self.assertEquals(result, expected_result)
def test_fret_span_should_return_zero_for_all_unplayed_strings(self):
frets = (None, None, None, None, None, None)
expected_result = 0
result = fret_span(frets)
self.assertEquals(result, expected_result)
def test_fret_span_should_return_zero_for_only_one_fret(self):
frets = (1, 1, 1, 1, 1, 1)
expected_result = 0
result = fret_span(frets)
self.assertEquals(result, expected_result)
def score_chord(chord, fingers):
# TODO note for scoring, finger span should be the scoring metric,
# example: distance between notes: a major would be 2 while a minor would
# be 3 there may need to be something extra for extra fret spans (5 or 6
# should be the limit)
# TODO should certain chords be modified by placement on the neck?
strings_used = sum(chord_utils.determine_strings_used(chord))
fret_span = chord_utils.fret_span(chord)
all_strings_used = len(chord) == strings_used
fingers_used = chord_utils.fingers_required(chord)
score = 0.0
if strings_used > 0:
score += fingers_used / 2.0
score += max((fret_span - 1), 0)
score += 1 if all_strings_used else 2
return score