Method down

src/utils/Cursor.ts:377–408

()

  }

  down(): Cursor {
    const { line, column } = this.getPosition()
    if (line >= this.measuredText.lineCount - 1) {
      return this
    }

    // If there is no next line, stay on the current line,
    // and let the caller handle it (e.g. for prompt input,
    // we move to the next history entry)
    const nextLine = this.measuredText.getWrappedText()[line + 1]
    if (nextLine === undefined) {
      return this
    }

    // If the current column is past the end of the next line,
    // move to the end of the next line
    const nextLineDisplayWidth = stringWidth(nextLine)
    if (column > nextLineDisplayWidth) {
      const newOffset = this.getOffset({
        line: line + 1,
        column: nextLineDisplayWidth,
      })
      return new Cursor(this.measuredText, newOffset, 0)
    }

    // Otherwise, move to the same column on the next line
    const newOffset = this.getOffset({
      line: line + 1,
      column,
    })
    return new Cursor(this.measuredText, newOffset, 0)
  }

  /**
   * Move to the start of the current line (column 0).