proper CLI

.editorconfig

@@ -0,0 +1,10 @@
+root = true
+
+[*]
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+charset = utf-8
+indent_style = space
+indent_size = 4
+max_line_length = 88

.flake8

@@ -0,0 +1,2 @@
+[flake8]
+max_line_length = 88

freude.py

@@ -1,25 +1,48 @@
+#!/usr/bin/env python
+import argparse
 import csv
+import sys
+
+parser = argparse.ArgumentParser()
+parser.add_argument("input", nargs="+", help="input CSV (pitch, duration, pause)")
+parser.add_argument("-o", "--output", default="/dev/stdout", help="output file (gcode)")
+parser.add_argument(
+    "--steps-per-mm",
+    default=5,
+    type=float,
+    help="motor steps per mm (actually an arbitrary scaling factor)",
+)
+parser.add_argument("--bpm", default=60, type=float, help="beats per minute")
+args = parser.parse_args()
 
-# actually an arbitrary scaling factor
-steps_per_mm = 5
 # starting from C3 = 130.81 Hz
 frequencies = [2 ** (i / 12) * 130.81 for i in range(24)]
-bpm = 60
-# duration of 1/8th
-base_duration = 60 / bpm / 8
+# duration of 1/16th beat
+base_duration = 60 / args.bpm / 16
 
-with open("FREUDE.gcode", "w") as f:
+with open(args.output, "w") as f:
     f.write("G21 ; set units to millimeters\n")
     f.write("G90 ; use absolute coordinates\n")
     f.write("G0 Z10 F300\n")
     f.write("G0 X0 Y0 F3000\n")
-    f.write("G4 S2\n")
+    f.write("G4 S2 ; wait 2 seconds\n")
     position = 0
-    with open("freude.txt", "r") as notes:
-        for note, duration, pause in csv.reader(notes):
-            feedrate = int(frequencies[int(note) + 12] * 60 / steps_per_mm)
-            length = int(duration) * base_duration / 60 * feedrate
-            position += -length if position > 100 else length
-            f.write(f"G0 X{position:.6f} Y{position:.6f} F{feedrate}\n")
-            f.write(f"G4 P{int(int(pause) * base_duration)}\n")
-    f.write("G4 S2\n")
+    for filename in args.input:
+        with open(filename, "r") as notes:
+            for pitch, duration, pause in csv.reader(notes):
+                pitch = int(pitch)
+                if pitch < -12 or pitch > 11:
+                    sys.exit("pitch goes from -12 == C3 to 11 == B4")
+                duration = int(duration)
+                pause = int(pause)
+                if duration < 1 or pause < 0:
+                    sys.exit("duration/pause are integer multiples of 1/16th beat")
+                feedrate = int(frequencies[pitch + 12] * 60 / args.steps_per_mm)
+                length = duration * base_duration / 60 * feedrate
+                position += -length if position > 100 else length
+                if position < 0 or position > 200:
+                    sys.exit("does not fit in 200x200")
+                pause_ms = int(pause * base_duration)
+                f.write(f"G0 X{position:.6f} Y{position:.6f} F{feedrate}\n")
+                f.write(f"G4 P{pause_ms}\n")
+        f.write("G4 S2 ; wait 2 seconds\n")

freude.txt

@@ -1,62 +1,62 @@
-4,2,0
-4,2,0
-5,2,0
-7,2,0
-7,2,0
-5,2,0
-4,2,0
+4,4,0
+4,4,0
+5,4,0
+7,4,0
+7,4,0
+5,4,0
+4,4,0
+2,4,0
+0,4,0
+0,4,0
+2,4,0
+4,4,0
+4,6,0
 2,2,0
+2,8,0
+4,4,0
+4,4,0
+5,4,0
+7,4,0
+7,4,0
+5,4,0
+4,4,0
+2,4,0
+0,4,0
+0,4,0
+2,4,0
+4,4,0
+2,6,0
 0,2,0
-0,2,0
-2,2,0
-4,2,0
-4,3,0
-2,1,0
+0,8,0
+2,4,0
+2,4,0
+4,4,0
+0,4,0
 2,4,0
 4,2,0
-4,2,0
 5,2,0
-7,2,0
-7,2,0
-5,2,0
-4,2,0
-2,2,0
-0,2,0
-0,2,0
-2,2,0
-4,2,0
-2,3,0
-0,1,0
+4,4,0
 0,4,0
-2,2,0
-2,2,0
-4,2,0
-0,2,0
-2,2,0
-4,1,0
-5,1,0
-4,2,0
-0,2,0
-2,2,0
-4,1,0
-5,1,0
-4,2,0
-2,2,0
-0,2,0
-2,2,0
--5,4,0
-4,2,0
+2,4,0
 4,2,0
 5,2,0
-7,2,0
-7,2,0
-5,2,0
-4,2,0
-2,2,0
-0,2,0
-0,2,0
-2,2,0
-4,2,0
-2,3,0
-0,1,0
+4,4,0
+2,4,0
 0,4,0
+2,4,0
+-5,8,0
+4,4,0
+4,4,0
+5,4,0
+7,4,0
+7,4,0
+5,4,0
+4,4,0
+2,4,0
+0,4,0
+0,4,0
+2,4,0
+4,4,0
+2,6,0
+0,2,0
+0,8,0