sync-box 0.1.1

一个高效的目录同步工具，支持实时监听文件变化并自动同步，可通过命令行直接使用或通过配置文件管理多个同步任务。
Documentation 
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/// 格式化文件大小为易读格式 (B, KB, MB, GB, TB)
/// 示例: 1024 -> "1.0 KB", 1048576 -> "1.0 MB"
pub fn format_file_size(bytes: u64) -> String {
    const UNITS: [&str; 5] = ["B", "KB", "MB", "GB", "TB"];
    let mut size = bytes as f64;
    let mut unit_index = 0;

    while size >= 1024.0 && unit_index < UNITS.len() - 1 {
        size /= 1024.0;
        unit_index += 1;
    }

    // 专业推荐：非Bytes单位都显示1位小数
    if unit_index == 0 {
        format!("{} {}", size as u64, UNITS[unit_index])
    } else {
        format!("{:.1} {}", size, UNITS[unit_index])
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_format_file_size() {
        assert_eq!(format_file_size(0), "0 B");
        assert_eq!(format_file_size(999), "999 B");
        assert_eq!(format_file_size(1024), "1.0 KB");
        assert_eq!(format_file_size(1536), "1.5 KB");
        assert_eq!(format_file_size(1048576), "1.0 MB");
        assert_eq!(format_file_size(1572864), "1.5 MB");
        assert_eq!(format_file_size(1073741824), "1.0 GB");
    }

}