nixos/kelder: Add amogus

nixos/boxes/kelder/amogus_beep.py

@@ -0,0 +1,46 @@
+#!/usr/bin/env python3
+import subprocess
+import math
+
+# https://en.wikipedia.org/wiki/Piano_key_frequencies
+def note_freq(n):
+    return math.pow(2, (n - 49) / 12) * 440
+
+def gen_beep_command(notes, bpm):
+    cmd = ['beep']
+    for i, (n, d) in enumerate(notes):
+        f = note_freq(n)
+        ms = (d / (bpm/60)) * 1000
+
+        cmd += ['-f', str(int(f)), '-l', str(int(ms))]
+        if i != len(notes) -1:
+            cmd.append('-n')
+
+    return cmd
+
+# First 2 bars of https://musescore.com/user/5032516/scores/6519100 ;)
+tempo = 94
+melody = [
+    (52, 1/2),
+    (55, 1/2),
+
+    (57, 1/2),
+    (58, 1/2),
+    (57, 1/2),
+    (55, 1/2),
+
+    (52, 1+1/2),
+
+    (50, 1/4),
+    (54, 1/4),
+
+    (52, 1),
+]
+
+def main():
+    cmd = gen_beep_command(melody, tempo)
+    # print(' '.join(cmd))
+    subprocess.check_call(cmd)
+
+if __name__ == '__main__':
+    main()