maclean 0.9.1

Find and reclaim disk space on macOS
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31

/// Format a byte count the way macOS Storage does (decimal units).
pub fn format_bytes(bytes: u64) -> String {
    const UNITS: [&str; 5] = ["B", "KB", "MB", "GB", "TB"];
    let mut value = bytes as f64;
    let mut unit = 0;
    while value >= 1000.0 && unit < UNITS.len() - 1 {
        value /= 1000.0;
        unit += 1;
    }
    if unit == 0 {
        format!("{bytes} B")
    } else if value >= 100.0 {
        format!("{value:.0} {}", UNITS[unit])
    } else if value >= 10.0 {
        format!("{value:.1} {}", UNITS[unit])
    } else {
        format!("{value:.2} {}", UNITS[unit])
    }
}

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

    #[test]
    fn formats_known_sizes() {
        assert_eq!(format_bytes(0), "0 B");
        assert_eq!(format_bytes(512), "512 B");
        assert_eq!(format_bytes(14_000_000_000), "14.0 GB");
    }
}