Method getLine

lib/buffer.ts:164–201

(y: number)

  }

  getLine(y: number): IBufferLine | undefined {
    const wasmTerm = this.getWasmTerm();
    if (!wasmTerm) return undefined;

    // Check bounds
    if (y < 0 || y >= this.length) {
      return undefined;
    }

    // Determine if accessing scrollback or visible screen
    const scrollbackLength = wasmTerm.getScrollbackLength();
    let cells: GhosttyCell[] | null;
    let lineNumber: number;
    let isWrapped: boolean;

    if (this.bufferType === 'normal' && y < scrollbackLength) {
      // Accessing scrollback
      // WASM getScrollbackLine: offset 0 = oldest, offset (length-1) = newest
      // Buffer coords: y=0 = oldest, y=(length-1) = newest
      // So scrollbackOffset = y directly!
      const scrollbackOffset = y;
      cells = wasmTerm.getScrollbackLine(scrollbackOffset);
      // TODO: We'd need WASM API to check if scrollback line is wrapped
      // For now, assume not wrapped
      isWrapped = false;
    } else {
      // Accessing visible screen
      lineNumber = this.bufferType === 'normal' ? y - scrollbackLength : y;
      cells = wasmTerm.getLine(lineNumber);
      isWrapped = wasmTerm.isRowWrapped(lineNumber);
    }

    if (!cells) {
      return undefined;
    }

    return new BufferLine(cells, isWrapped, wasmTerm.cols);
  }

  getNullCell(): IBufferCell {
    return this.nullCell;