writeChartFile: emit instrument track sections#102
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This was referenced Apr 20, 2026
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Builds a minimal valid ParsedChart from scratch: default 480 resolution, 120 BPM at tick 0, 4/4 time signature at tick 0, empty tracks/sections/ metadata/vocal parts/unrecognized events. chartBytes defaults to an empty Uint8Array (no source bytes), format defaults to 'chart', iniChartModifiers to the library defaults. Options let callers override resolution, bpm, timeSignature, and format. Useful for programmatic chart generation (e.g. downstream code that builds charts up from scratch rather than parsing source bytes).
Serializes IniMetadata (Partial<typeof defaultMetadata> + extraIniFields) back to song.ini text with: - [song] header - Known fields emitted in the canonical defaultMetadata order - Undefined values skipped - Booleans as True/False (Clone Hero convention) - extraIniFields appended in insertion order - CRLF line endings Derives its field order from Object.keys(defaultMetadata) rather than hardcoding a separate FIELD_ORDER list, so new fields added to defaultMetadata automatically participate in writing. Tests exercise writeIniFile only via round-trip through parseChartAndIni, per reviewer feedback: build a metadata object, write it, re-parse, and assert on parsedChart.metadata. No assertions about the serialized ini text itself (CRLF, field order, True/False formatting, quoting) — those are implementation details.
…emission Port of the non-instrument-track half of the chart writer into scan-chart: - [Song] emits the subset of metadata the chart body supports (Name, Artist, Charter, Album, Genre, Year, Resolution, Offset, PreviewStart, Difficulty). Other fields live exclusively in song.ini. - [SyncTrack] emits tempos as `B millibeats` and time signatures as `TS numerator [denominator-exponent]`, sorted by tick with TS before B at the same tick. - [Events] emits section markers (wrapped as [section name] to survive the parser's greedy trailing-\] regex), end events, unrecognized global events (with bracket-stripping when source is .mid so round-trip to .chart emits naked text), and vocal phrase_start/phrase_end/lyric events from the normalized vocalTracks.parts.vocals. - Unrecognized chart sections are re-emitted verbatim. Instrument tracks ([ExpertSingle] etc.) land in a follow-up PR.
Completes writeChartFile with per-track section emission: - [ExpertSingle], [HardDrums], etc. named from instrument + difficulty. - Drum tracks: base notes (N 0..4 or 0..5 for 5-lane), cymbal markers (N 66/67/68) only in fourLanePro, accent (N 34..38) and ghost (N 40..44) markers matching the emitted note's eventType, one N 109 flam per group, double kick as N 32 only. - 5-lane round-trip: greenDrum+cymbal emits as N 4 (orange) while plain greenDrum stays at N 5; blueDrums coinciding with greenDrum+cymbal emit as N 5 to keep the parser's drumType detection on fiveLane. - Fret/GHL tracks: notes via the 5-fret and 6-fret maps, tap as N 6, forceUnnatural (N 5) when the note's hopo/strum flag disagrees with the natural-HOPO state. - Star power S 2, activation lanes S 64, flex lanes S 65/66, versus phrases S 0/1, solo sections as E 'solo'/'soloend' (tick + length - 1 for soloend to round-trip). - Per-track text events (including disco flip mix markers). - Disco-flip state transitions per difficulty from red/yellow drum disco/discoNoflip flags → 'mix <diff> drums0[d|dnoflip]' text events. - Coda events: if no 'coda' in unrecognizedEvents, synthesize from drumFreestyleSections where isCoda=true. - hasForcedNotes backstop: if hasForcedNotes is set but no forceUnnatural emitted, append N 5 0 at a vacant tick in the first fret track to preserve the flag on round-trip.
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Context
Completes `writeChartFile` with per-track section emission.
Features
No `hasForcedNotes` backstop — per-note natural-HOPO comparison is sufficient to preserve `hasForcedNotes` state under the state-derived definition introduced in PR #98.
Depends on
PRs #97 + #98 + #99 + #100 + #101 — stacked above.