aprender_zram_cli/commands/
status.rs

1//! Status command for zram devices.
2//!
3//! This is a pure shim that delegates to `trueno_zram_core::zram`.
4
5use crate::output::OutputFormat;
6use clap::Args;
7use serde::Serialize;
8use trueno_zram_core::zram::{format_size, SysfsOps, ZramOps};
9
10/// Arguments for status command.
11#[derive(Debug, Args)]
12pub struct StatusArgs {
13    /// Specific device to show (omit for all devices).
14    #[arg(short, long)]
15    pub device: Option<u32>,
16}
17
18/// Serializable status for JSON output.
19#[derive(Debug, Serialize)]
20struct StatusOutput {
21    device: u32,
22    disksize: u64,
23    orig_data_size: u64,
24    compr_data_size: u64,
25    mem_used_total: u64,
26    algorithm: String,
27    ratio: f64,
28}
29
30/// Show zram device status.
31///
32/// # Errors
33/// Returns an error if zram device state cannot be read.
34pub fn status(args: &StatusArgs, format: OutputFormat) -> Result<(), Box<dyn std::error::Error>> {
35    let ops = SysfsOps::new();
36
37    let statuses: Vec<StatusOutput> = if let Some(dev) = args.device {
38        let s = ops.status(dev)?;
39        let ratio = s.compression_ratio();
40        vec![StatusOutput {
41            device: s.device,
42            disksize: s.disksize,
43            orig_data_size: s.orig_data_size,
44            compr_data_size: s.compr_data_size,
45            mem_used_total: s.mem_used_total,
46            algorithm: s.algorithm,
47            ratio,
48        }]
49    } else {
50        ops.list()?
51            .into_iter()
52            .map(|s| {
53                let ratio = s.compression_ratio();
54                StatusOutput {
55                    device: s.device,
56                    disksize: s.disksize,
57                    orig_data_size: s.orig_data_size,
58                    compr_data_size: s.compr_data_size,
59                    mem_used_total: s.mem_used_total,
60                    algorithm: s.algorithm,
61                    ratio,
62                }
63            })
64            .collect()
65    };
66
67    match format {
68        OutputFormat::Table => print_table(&statuses),
69        OutputFormat::Json => {
70            println!("{}", serde_json::to_string_pretty(&statuses)?);
71        }
72        OutputFormat::Raw => {
73            for s in &statuses {
74                println!(
75                    "{} {} {} {} {} {}",
76                    s.device,
77                    s.disksize,
78                    s.orig_data_size,
79                    s.compr_data_size,
80                    s.mem_used_total,
81                    s.algorithm
82                );
83            }
84        }
85    }
86
87    Ok(())
88}
89
90fn print_table(statuses: &[StatusOutput]) {
91    println!(
92        "{:>6} {:>10} {:>10} {:>10} {:>10} {:>8} {:>8}",
93        "DEVICE", "DISKSIZE", "DATA", "COMPR", "TOTAL", "ALGO", "RATIO"
94    );
95
96    for s in statuses {
97        println!(
98            "zram{:<2} {:>10} {:>10} {:>10} {:>10} {:>8} {:>7.2}x",
99            s.device,
100            format_size(s.disksize),
101            format_size(s.orig_data_size),
102            format_size(s.compr_data_size),
103            format_size(s.mem_used_total),
104            &s.algorithm[..s.algorithm.len().min(8)],
105            s.ratio
106        );
107    }
108}
aprender_zram_cli/commands/status.rs

aprender_zram_cli/commands/
status.rs
