Make JSON output more readable - each pitch on one line

src/io.py

@@ -11,26 +11,24 @@ from random import seed
 
 def write_chord_sequence(seq: list["Chord"], path: str) -> None:
     """Write a chord sequence to a JSON file."""
-    serializable = []
-    for chord in seq:
-        chord_data = []
-        for pitch in chord._pitches:
-            chord_data.append(
-                {
-                    "hs_array": list(pitch.hs_array),
-                    "fraction": str(pitch.to_fraction()),
-                    "cents": pitch.to_cents(),
-                }
-            )
-        serializable.append(chord_data)
-
-    content = json.dumps(serializable, indent=2)
-    content = content.replace("[[[", "[\n\t[[")
-    content = content.replace(", [[", ",\n\t[[")
-    content = content.replace("]]]", "]]\n]")
+    lines = ["["]
+    for chord_idx, chord in enumerate(seq):
+        lines.append(" [")
+        for pitch_idx, pitch in enumerate(chord._pitches):
+            pitch_obj = {
+                "hs_array": list(pitch.hs_array),
+                "fraction": str(pitch.to_fraction()),
+                "cents": pitch.to_cents(),
+            }
+            pitch_json = json.dumps(pitch_obj)
+            comma = "," if pitch_idx < len(chord._pitches) - 1 else ""
+            lines.append(f"  {pitch_json}{comma}")
+        chord_bracket = " ]" if chord_idx == len(seq) - 1 else " ],"
+        lines.append(chord_bracket)
+    lines.append("]")
 
     with open(path, "w") as f:
-        f.write(content)
+        f.write("\n".join(lines))
 
 
 def write_chord_sequence_readable(seq: list["Chord"], path: str) -> None:
@@ -70,33 +68,68 @@ def _serialize_edge_data(edge_data: dict) -> dict:
     return result
 
 
+def _format_chord_line(pitches: list) -> str:
+    """Format a chord (list of pitch hs_arrays) as a single line."""
+    return json.dumps([list(p) if hasattr(p, "hs_array") else p for p in pitches])
+
+
+def _format_edge_data_compact(edge_data: dict) -> dict:
+    """Format edge data for compact JSON output."""
+    result = {}
+    for key, value in edge_data.items():
+        if hasattr(value, "hs_array"):
+            result[key] = list(value.hs_array)
+        elif isinstance(value, list) and value and hasattr(value[0], "hs_array"):
+            result[key] = [list(p.hs_array) for p in value]
+        else:
+            result[key] = value
+    return result
+
+
 def write_path_steps(path: "Path", output_path: str) -> None:
     """Write path with all step data to JSON."""
-    steps_data = []
-    for i, step in enumerate(path.steps):
-        step_data = {
-            "step": i,
-            "source_node": [list(p.hs_array) for p in step.source_node.pitches],
-            "destination_node": [
-                list(p.hs_array) for p in step.destination_node.pitches
-            ],
-            "source_chord": [list(p.hs_array) for p in step.source_chord.pitches],
-            "destination_chord": [
-                list(p.hs_array) for p in step.destination_chord.pitches
-            ],
-            "transposition": list(step.transposition.hs_array)
-            if step.transposition
-            else None,
-            "movements": {str(k): v for k, v in step.movements.items()},
-            "scores": step.scores,
-            "normalized_scores": step.normalized_scores,
-            "weight": step.weight,
-            "edge_data": _serialize_edge_data(step.edge_data),
-        }
-        steps_data.append(step_data)
+    lines = ["["]
+    for step_idx, step in enumerate(path.steps):
+        lines.append(" {")
+        lines.append(f'  "step": {step_idx},')
+
+        lines.append(
+            f'  "source_chord": {_format_chord_line(step.source_chord.pitches)},'
+        )
+        lines.append(
+            f'  "destination_chord": {_format_chord_line(step.destination_chord.pitches)},'
+        )
+
+        if step.transposition:
+            trans = list(step.transposition.hs_array)
+            lines.append(f'  "transposition": {json.dumps(trans)},')
+        else:
+            lines.append('  "transposition": null,')
+
+        lines.append(
+            f'  "movements": {json.dumps({str(k): v for k, v in step.movements.items()})},'
+        )
+
+        if step.scores:
+            lines.append(f'  "scores": {json.dumps(step.scores)},')
+
+        if step.normalized_scores:
+            lines.append(
+                f'  "normalized_scores": {json.dumps(step.normalized_scores)},'
+            )
+
+        if step.weight is not None:
+            lines.append(f'  "weight": {step.weight},')
+
+        edge_data = _format_edge_data_compact(step.edge_data)
+        lines.append(f'  "edge_data": {json.dumps(edge_data)}')
+
+        lines.append(" }" + ("," if step_idx < len(path.steps) - 1 else ""))
+
+    lines.append("]")
 
     with open(output_path, "w") as f:
-        json.dump(steps_data, f, indent=2)
+        f.write("\n".join(lines))
 
 
 def graph_to_dict(graph: "nx.MultiDiGraph") -> dict: