note_blame.py
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| 1 | """muse note-blame — per-bar attribution for a MIDI track. |
| 2 | |
| 3 | Shows which commit introduced the notes currently in a specific bar. |
| 4 | The music-domain equivalent of ``muse blame`` — instead of "which commit |
| 5 | last touched this function?", it answers "which commit wrote the notes |
| 6 | in bar 8 of the melody?" |
| 7 | |
| 8 | Usage:: |
| 9 | |
| 10 | muse note-blame tracks/melody.mid --bar 4 |
| 11 | muse note-blame tracks/melody.mid --bar 12 --json |
| 12 | |
| 13 | Output:: |
| 14 | |
| 15 | Note attribution: tracks/melody.mid bar 4 |
| 16 | |
| 17 | C4 vel=80 @beat=1.00 dur=1.00 ch 0 |
| 18 | E4 vel=75 @beat=2.00 dur=0.50 ch 0 |
| 19 | G4 vel=72 @beat=2.50 dur=0.50 ch 0 |
| 20 | E4 vel=75 @beat=3.00 dur=1.00 ch 0 |
| 21 | |
| 22 | 2 notes in bar 4 introduced by: |
| 23 | cb4afaed 2026-03-16 alice "Add chord arpeggiation in bar 4" |
| 24 | """ |
| 25 | |
| 26 | import argparse |
| 27 | import json |
| 28 | import logging |
| 29 | import pathlib |
| 30 | import sys |
| 31 | |
| 32 | from muse.core.errors import ExitCode |
| 33 | from muse.core.repo import require_repo |
| 34 | from muse.core.refs import read_current_branch |
| 35 | from muse.core.commits import resolve_commit_ref |
| 36 | from muse.domain import DomainOp |
| 37 | from muse.plugins.midi._query import ( |
| 38 | NoteInfo, |
| 39 | load_track, |
| 40 | walk_commits_for_track, |
| 41 | ) |
| 42 | from muse.plugins.midi.midi_diff import NoteKey, _note_content_id |
| 43 | from muse.core.validation import clamp_int |
| 44 | from muse.core.validation import sanitize_display |
| 45 | |
| 46 | type _OriginMap = dict[str, tuple[str, str, str, str]] |
| 47 | logger = logging.getLogger(__name__) |
| 48 | |
| 49 | def _read_branch(root: pathlib.Path) -> str: |
| 50 | return read_current_branch(root) |
| 51 | |
| 52 | def _cid_for_note(note: NoteInfo) -> str: |
| 53 | """Return the content ID for a ``NoteInfo`` (delegates to midi_diff logic).""" |
| 54 | key = NoteKey( |
| 55 | pitch=note.pitch, |
| 56 | velocity=note.velocity, |
| 57 | start_tick=note.start_tick, |
| 58 | duration_ticks=note.duration_ticks, |
| 59 | channel=note.channel, |
| 60 | ) |
| 61 | return _note_content_id(key) |
| 62 | |
| 63 | def register(subparsers: "argparse._SubParsersAction[argparse.ArgumentParser]") -> None: |
| 64 | """Register the note-blame subcommand.""" |
| 65 | parser = subparsers.add_parser("note-blame", help="Show which commit introduced the notes in a specific bar.", description=__doc__, formatter_class=argparse.RawDescriptionHelpFormatter) |
| 66 | parser.add_argument("track", metavar="TRACK", help="Workspace-relative path to a .mid file.") |
| 67 | parser.add_argument("--bar", "-b", metavar="N", type=int, required=True, help="Bar number (1-indexed, assumes 4/4 time).") |
| 68 | parser.add_argument("--from", metavar="REF", default=None, dest="from_ref", help="Start search from this commit (default: HEAD).") |
| 69 | parser.add_argument("--json", action="store_true", dest="as_json", help="Emit results as JSON.") |
| 70 | parser.set_defaults(func=run) |
| 71 | |
| 72 | def run(args: argparse.Namespace) -> None: |
| 73 | """Show which commit introduced the notes in a specific bar. |
| 74 | |
| 75 | ``muse note-blame`` walks the commit history and finds the commit that |
| 76 | first inserted each note currently in bar N. This gives per-note |
| 77 | attribution at the musical level — not the line level. |
| 78 | |
| 79 | This is strictly impossible in Git: Git cannot tell you "these notes in |
| 80 | bar 4 were added in commit X" because Git has no concept of notes or bars. |
| 81 | |
| 82 | Use ``--bar`` to specify the bar number (1-indexed, 4/4 time assumed). |
| 83 | Use ``--from`` to start the search at a different point in history. |
| 84 | """ |
| 85 | track: str = args.track |
| 86 | bar: int = clamp_int(args.bar, 0, 10000, 'bar') |
| 87 | from_ref: str | None = args.from_ref |
| 88 | as_json: bool = args.as_json |
| 89 | |
| 90 | root = require_repo() |
| 91 | branch = _read_branch(root) |
| 92 | |
| 93 | start_commit = resolve_commit_ref(root, branch, from_ref) |
| 94 | if start_commit is None: |
| 95 | print(f"❌ Commit '{from_ref or 'HEAD'}' not found.", file=sys.stderr) |
| 96 | raise SystemExit(ExitCode.USER_ERROR) |
| 97 | |
| 98 | track_result = load_track(root, start_commit.commit_id, track) |
| 99 | if track_result is None: |
| 100 | print(f"❌ Track '{track}' not found in this commit.", file=sys.stderr) |
| 101 | raise SystemExit(ExitCode.USER_ERROR) |
| 102 | |
| 103 | current_notes, _tpb = track_result |
| 104 | bar_notes = [n for n in current_notes if n.bar == bar] |
| 105 | |
| 106 | if not bar_notes: |
| 107 | print(f" (no notes found in bar {bar} of '{track}')") |
| 108 | return |
| 109 | |
| 110 | # Build a set of content IDs for the bar's notes. |
| 111 | target_ids: set[str] = {_cid_for_note(n) for n in bar_notes} |
| 112 | |
| 113 | # Walk commits to find when each note was first inserted. |
| 114 | note_origins: _OriginMap = {} |
| 115 | commits_data = walk_commits_for_track(root, start_commit.commit_id, track) |
| 116 | |
| 117 | for commit, _manifest in commits_data: |
| 118 | if commit.structured_delta is None: |
| 119 | continue |
| 120 | for op in commit.structured_delta["ops"]: |
| 121 | if op["address"] != track: |
| 122 | continue |
| 123 | child_ops: list[DomainOp] = op["child_ops"] if op["op"] == "patch" else [] |
| 124 | for child in child_ops: |
| 125 | if child["op"] == "insert": |
| 126 | cid = child["content_id"] |
| 127 | if cid in target_ids and cid not in note_origins: |
| 128 | date_str = commit.committed_at.strftime("%Y-%m-%d") |
| 129 | note_origins[cid] = ( |
| 130 | commit.commit_id, |
| 131 | date_str, |
| 132 | commit.author or "unknown", |
| 133 | commit.message, |
| 134 | ) |
| 135 | |
| 136 | if as_json: |
| 137 | print(json.dumps( |
| 138 | { |
| 139 | "track": track, |
| 140 | "bar": bar, |
| 141 | "notes": [ |
| 142 | { |
| 143 | "pitch_name": n.pitch_name, |
| 144 | "velocity": n.velocity, |
| 145 | "beat_in_bar": round(n.beat_in_bar, 2), |
| 146 | "beat_duration": round(n.beat_duration, 2), |
| 147 | "channel": n.channel, |
| 148 | "introduced_by": note_origins.get(_cid_for_note(n), ("unknown", "", "", ""))[0], |
| 149 | } |
| 150 | for n in bar_notes |
| 151 | ], |
| 152 | }, |
| 153 | )) |
| 154 | return |
| 155 | |
| 156 | print(f"\nNote attribution: {sanitize_display(track)} bar {bar}") |
| 157 | print("") |
| 158 | for n in bar_notes: |
| 159 | print( |
| 160 | f" {n.pitch_name:<5} vel={n.velocity:<3} " |
| 161 | f"@beat={n.beat_in_bar:.2f} dur={n.beat_duration:.2f} ch {n.channel}" |
| 162 | ) |
| 163 | |
| 164 | print("") |
| 165 | |
| 166 | commit_counts: dict[tuple[str, str, str, str], int] = {} |
| 167 | for n in bar_notes: |
| 168 | origin = note_origins.get(_cid_for_note(n)) |
| 169 | if origin: |
| 170 | commit_counts[origin] = commit_counts.get(origin, 0) + 1 |
| 171 | |
| 172 | if not commit_counts: |
| 173 | print(" (could not trace origin — notes may predate the tracked history)") |
| 174 | return |
| 175 | |
| 176 | for (commit_id, date, author, message), count in sorted( |
| 177 | commit_counts.items(), key=lambda kv: kv[1], reverse=True |
| 178 | ): |
| 179 | label = "note" if count == 1 else "notes" |
| 180 | print(f" {count} {label} in bar {bar} introduced by:") |
| 181 | print(f" {commit_id} {date} {sanitize_display(author)} \"{sanitize_display(message)}\"") |
| 182 | print("") |