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.gemini/notes.md

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+# Project: fumen-analyze
+
+## Technical Stack
+- **Runtime**: [Bun](https://bun.sh/)
+- **Language**: TypeScript
+- **Library**: [tja](https://www.npmjs.com/package/tja) (TJA parser)
+
+## Library Usage (tja)
+- **Import**: `import { TJAParser } from "tja";`
+- **Parsing**: `const parsed = TJAParser.parse(content);`
+- **Structure**:
+    - `parsed.title`, `parsed.bpm`, `parsed.offset`
+    - `parsed.courses` (Array of `Course` objects)
+    - `course.difficulty` (e.g., "Oni")
+    - `course.stars` (Level/Stars)
+    - `course.activeCourse.getCommands()` returns an array of commands and note sequences.
+
+## Purpose
+Analyzing or processing TJA (Taiko Jiro) file formats.
+
+## Key References
+- `tja-format.mediawiki`: Detailed specification of the TJA format.
+
+## TJA Format Overview
+- **Encoding**: UTF-8 with BOM or Shift-JIS.
+- **Extension**: `.tja`.
+- **Comments**: Start with `//`.
+- **Metadata**: Key-value pairs (e.g., `TITLE:`, `BPM:`, `OFFSET:`).
+- **Course Metadata**: Specific to difficulties (e.g., `COURSE:`, `LEVEL:`, `BALLOON:`).
+- **Notation**: Commands prefixed with `#` (e.g., `#START`, `#END`, `#MEASURE`, `#BPMCHANGE`).
+- **Notes**: `0-9`, `A`, `B`, `F`.