1 files changed, 58 insertions, 0 deletions
diff --git a/gen_pitches.py b/gen_pitches.py
new file mode 100644
index 0000000..8c15317
--- /dev/null
+++ b/gen_pitches.py
@@ -0,0 +1,58 @@
+from functools import partial
+from string import Template
+
+index_to_pitch = [ "a", "b", "c", "d", "e", "f", "g"]
+pitch_to_index = { "a": 0, "b": 1, "c": 2, "d": 3, "e": 4, "f": 5, "g": 6}
+
+def pitch_transpose(pitch, delta=1):
+    return index_to_pitch[(pitch_to_index[pitch[0]] + delta) % 7] + pitch[1:]
+
+def bar_transpose(bar, delta=1):
+    return " ".join(pitch_transpose(pitch, delta) for pitch in bar.split())
+
+def compile_exercise(seed_asc, seed_desc):
+    asc = "\n".join(bar_transpose(seed_asc, i) for i in xrange(7))
+    desc = "\n".join(bar_transpose(seed_desc, -i) for i in xrange(7))
+    right = """\\relative e {
+$asc
+
+$asc
+\\bar "||"
+}
+\\relative e'' {
+$desc
+
+$desc
+\\bar "|."
+}
+"""
+    left = """\\relative e, {
+$asc
+
+$asc
+\\bar "||"
+}
+\\relative e' {
+$desc
+
+$desc
+\\bar "|."
+}
+"""
+    tpl_left, tpl_right = Template(left), Template(right)
+    return (tpl_left.substitute(asc=asc, desc=desc),
+            tpl_right.substitute(asc=asc, desc=desc))
+
+
+if __name__ == "__main__":
+    import sys
+    from string import Template
+    seeds = sys.argv[1]
+    with open(seeds) as fh:
+        for line in fh:
+            num, seed_asc, seed_desc = line.split("#")
+            lh, rh = compile_exercise(seed_asc, seed_desc)
+            with open("rh" + num + ".ily", "w") as fhr:
+                fhr.write(rh)
+            with open("lh" + num + ".ily", "w") as fhr:
+                fhr.write(lh)