Implement awful Scale class and its awful methods

fuck this exercise in particular and music theory in general

scale-generator/scale_generator.py

@@ -1,9 +1,30 @@
+PITCHES_SH = ['A', 'A#', 'B', 'C', 'C#', 'D', 'D#', 'E', 'F', 'F#', 'G', 'G#']
+PITCHES_FL = ['A', 'Bb', 'B', 'C', 'Db', 'D', 'Eb', 'E', 'F', 'Gb', 'G', 'Ab']
+
+FLAT_SCALES = {'F', 'Bb', 'Eb', 'Ab', 'Db', 'Gb', 'd', 'g', 'c', 'f', 'bb', 'eb'}
+
+INTERVALS = {'m': 1, 'M': 2, 'A': 3}
+
+
 class Scale:
     def __init__(self, tonic):
-        pass
+        if tonic in FLAT_SCALES:
+            start = PITCHES_FL.index(tonic[0].upper() + tonic[1:])
+            self.scale = PITCHES_FL[start:] + PITCHES_FL[:start]
+        else:
+            start = PITCHES_SH.index(tonic[0].upper() + tonic[1:])
+            self.scale = PITCHES_SH[start:] + PITCHES_SH[:start]
 
     def chromatic(self):
-        pass
+        return self.scale
 
     def interval(self, intervals):
-        pass
+        i = 0
+        scale = []
+        for step in intervals:
+            # note: last step in intervals is *supposed* to be skipped,
+            # obviously for no apparent reason (classic music theory, amirite)
+            scale.append(self.scale[i % len(self.scale)])
+            i += INTERVALS[step]
+
+        return scale