note_hotspots.py
python
| 1 | """muse note-hotspots — bar-level churn leaderboard across MIDI tracks. |
| 2 | |
| 3 | Walks the commit history and counts how many times each bar in each track |
| 4 | was touched (had notes added or removed). High churn at the bar level |
| 5 | reveals the musical sections under active evolution — the bridge that's |
| 6 | always changing, the verse that won't settle. |
| 7 | |
| 8 | Usage:: |
| 9 | |
| 10 | muse note-hotspots |
| 11 | muse note-hotspots --top 20 |
| 12 | muse note-hotspots --track tracks/melody.mid |
| 13 | muse note-hotspots --from HEAD~30 |
| 14 | |
| 15 | Output:: |
| 16 | |
| 17 | Note churn — top 10 most-changed bars |
| 18 | Commits analysed: 47 |
| 19 | |
| 20 | 1 tracks/melody.mid bar 8 12 changes |
| 21 | 2 tracks/melody.mid bar 4 9 changes |
| 22 | 3 tracks/bass.mid bar 8 7 changes |
| 23 | 4 tracks/piano.mid bar 12 5 changes |
| 24 | |
| 25 | High churn = compositional instability. Consider locking this section. |
| 26 | """ |
| 27 | from __future__ import annotations |
| 28 | |
| 29 | import json |
| 30 | import logging |
| 31 | import pathlib |
| 32 | |
| 33 | import typer |
| 34 | |
| 35 | from muse.core.errors import ExitCode |
| 36 | from muse.core.repo import require_repo |
| 37 | from muse.core.store import resolve_commit_ref |
| 38 | from muse.plugins.music._query import NoteInfo, walk_commits_for_track |
| 39 | |
| 40 | logger = logging.getLogger(__name__) |
| 41 | |
| 42 | app = typer.Typer() |
| 43 | |
| 44 | |
| 45 | def _read_repo_id(root: pathlib.Path) -> str: |
| 46 | return str(json.loads((root / ".muse" / "repo.json").read_text())["repo_id"]) |
| 47 | |
| 48 | |
| 49 | def _read_branch(root: pathlib.Path) -> str: |
| 50 | head_ref = (root / ".muse" / "HEAD").read_text().strip() |
| 51 | return head_ref.removeprefix("refs/heads/").strip() |
| 52 | |
| 53 | |
| 54 | def _bar_of_beat_summary(note_summary: str, tpb: int) -> int | None: |
| 55 | """Extract bar number from a note summary string like 'C4 vel=80 @beat=3.00 dur=1.00'. |
| 56 | |
| 57 | Returns ``None`` when the beat position cannot be parsed. |
| 58 | """ |
| 59 | for part in note_summary.split(): |
| 60 | if part.startswith("@beat="): |
| 61 | try: |
| 62 | beat = float(part.removeprefix("@beat=")) |
| 63 | bar = int(beat // 4) + 1 |
| 64 | return bar |
| 65 | except ValueError: |
| 66 | return None |
| 67 | return None |
| 68 | |
| 69 | |
| 70 | @app.callback(invoke_without_command=True) |
| 71 | def note_hotspots( |
| 72 | ctx: typer.Context, |
| 73 | top: int = typer.Option(20, "--top", "-n", metavar="N", help="Number of bars to show (default: 20)."), |
| 74 | track_filter: str | None = typer.Option( |
| 75 | None, "--track", "-t", metavar="TRACK", |
| 76 | help="Restrict to a specific track file.", |
| 77 | ), |
| 78 | from_ref: str | None = typer.Option( |
| 79 | None, "--from", metavar="REF", |
| 80 | help="Exclusive start of the commit range (default: initial commit).", |
| 81 | ), |
| 82 | to_ref: str | None = typer.Option( |
| 83 | None, "--to", metavar="REF", |
| 84 | help="Inclusive end of the commit range (default: HEAD).", |
| 85 | ), |
| 86 | as_json: bool = typer.Option(False, "--json", help="Emit results as JSON."), |
| 87 | ) -> None: |
| 88 | """Show the musical sections (bars) that change most often. |
| 89 | |
| 90 | ``muse note-hotspots`` walks the commit history and counts note-level |
| 91 | changes per bar per track. High churn at the bar level reveals the |
| 92 | musical sections under most active revision — the bridge that keeps |
| 93 | changing, the chorus that won't settle. |
| 94 | |
| 95 | This is the musical equivalent of ``muse hotspots`` for code: instead |
| 96 | of "which function changes most?", it answers "which bar changes most?" |
| 97 | |
| 98 | Use ``--track`` to focus on a specific MIDI file. Use ``--from`` / |
| 99 | ``--to`` to scope to a sprint or release window. |
| 100 | """ |
| 101 | root = require_repo() |
| 102 | repo_id = _read_repo_id(root) |
| 103 | branch = _read_branch(root) |
| 104 | |
| 105 | to_commit = resolve_commit_ref(root, repo_id, branch, to_ref) |
| 106 | if to_commit is None: |
| 107 | typer.echo(f"❌ Commit '{to_ref or 'HEAD'}' not found.", err=True) |
| 108 | raise typer.Exit(code=ExitCode.USER_ERROR) |
| 109 | |
| 110 | from_commit_id: str | None = None |
| 111 | if from_ref is not None: |
| 112 | from_c = resolve_commit_ref(root, repo_id, branch, from_ref) |
| 113 | if from_c is None: |
| 114 | typer.echo(f"❌ Commit '{from_ref}' not found.", err=True) |
| 115 | raise typer.Exit(code=ExitCode.USER_ERROR) |
| 116 | from_commit_id = from_c.commit_id |
| 117 | |
| 118 | # Discover all MIDI tracks touched in history. |
| 119 | seen_commit_ids: set[str] = set() |
| 120 | commits_count = 0 |
| 121 | |
| 122 | # Walk commits from to_commit back. |
| 123 | from muse.core.store import read_commit |
| 124 | bar_counts: dict[tuple[str, int], int] = {} |
| 125 | current_id: str | None = to_commit.commit_id |
| 126 | |
| 127 | while current_id and current_id != from_commit_id: |
| 128 | if current_id in seen_commit_ids: |
| 129 | break |
| 130 | seen_commit_ids.add(current_id) |
| 131 | commit = read_commit(root, current_id) |
| 132 | if commit is None: |
| 133 | break |
| 134 | commits_count += 1 |
| 135 | current_id = commit.parent_commit_id |
| 136 | |
| 137 | if commit.structured_delta is None: |
| 138 | continue |
| 139 | |
| 140 | for op in commit.structured_delta["ops"]: |
| 141 | track_addr = op["address"] |
| 142 | if track_filter and track_addr != track_filter: |
| 143 | continue |
| 144 | if not track_addr.lower().endswith(".mid"): |
| 145 | continue |
| 146 | child_ops = op["child_ops"] if op["op"] == "patch" else [] |
| 147 | for child in child_ops: |
| 148 | if child["op"] == "insert": |
| 149 | summary: str = child["content_summary"] |
| 150 | elif child["op"] == "delete": |
| 151 | summary = child["content_summary"] |
| 152 | else: |
| 153 | continue |
| 154 | bar_num = _bar_of_beat_summary(summary, 480) # 480 = standard tpb |
| 155 | if bar_num is None: |
| 156 | continue |
| 157 | key = (track_addr, bar_num) |
| 158 | bar_counts[key] = bar_counts.get(key, 0) + 1 |
| 159 | |
| 160 | ranked = sorted(bar_counts.items(), key=lambda kv: kv[1], reverse=True)[:top] |
| 161 | |
| 162 | if as_json: |
| 163 | typer.echo(json.dumps( |
| 164 | { |
| 165 | "commits_analysed": commits_count, |
| 166 | "hotspots": [ |
| 167 | {"track": t, "bar": b, "changes": c} for (t, b), c in ranked |
| 168 | ], |
| 169 | }, |
| 170 | indent=2, |
| 171 | )) |
| 172 | return |
| 173 | |
| 174 | track_label = f" track={track_filter}" if track_filter else "" |
| 175 | typer.echo(f"\nNote churn — top {len(ranked)} most-changed bars{track_label}") |
| 176 | typer.echo(f"Commits analysed: {commits_count}") |
| 177 | typer.echo("") |
| 178 | |
| 179 | if not ranked: |
| 180 | typer.echo(" (no note-level bar changes found)") |
| 181 | return |
| 182 | |
| 183 | width = len(str(len(ranked))) |
| 184 | for rank, ((track_addr, bar_num), count) in enumerate(ranked, 1): |
| 185 | label = "change" if count == 1 else "changes" |
| 186 | typer.echo( |
| 187 | f" {rank:>{width}} {track_addr:<40} bar {bar_num:>4} {count:>3} {label}" |
| 188 | ) |
| 189 | |
| 190 | typer.echo("") |
| 191 | typer.echo("High churn = compositional instability. Consider locking this section.") |