devclean-cli 0.4.1

Audit and safely remove rebuildable development artifacts
Documentation 
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use std::process::{Command, Stdio};

use anyhow::{Context, Result, bail};

/// Returns Docker's detailed, read-only disk usage summary.
///
/// # Errors
///
/// Returns an error when Docker is missing, unavailable, or exits unsuccessfully.
pub fn system_df() -> Result<String> {
    run_docker(&["system", "df", "-v"])
}

/// Removes only unused Docker build cache.
///
/// # Errors
///
/// Returns an error when Docker is missing, unavailable, or exits unsuccessfully.
pub fn prune_build_cache(older_than: Option<&str>) -> Result<String> {
    let mut arguments = vec!["builder", "prune", "-af"];
    let filter;
    if let Some(age) = older_than {
        filter = format!("until={age}");
        arguments.extend(["--filter", &filter]);
    }
    run_docker(&arguments)
}

/// Removes stopped containers, unused networks/images, and build cache.
///
/// Docker volumes are intentionally never passed to prune.
///
/// # Errors
///
/// Returns an error when Docker is missing, unavailable, or exits unsuccessfully.
pub fn prune_system(older_than: Option<&str>) -> Result<String> {
    let mut arguments = vec!["system", "prune", "-af"];
    let filter;
    if let Some(age) = older_than {
        filter = format!("until={age}");
        arguments.extend(["--filter", &filter]);
    }
    run_docker(&arguments)
}

fn run_docker(arguments: &[&str]) -> Result<String> {
    let output = Command::new("docker")
        .args(arguments)
        .stdin(Stdio::null())
        .output()
        .context("failed to run docker")?;
    if !output.status.success() {
        let stderr = String::from_utf8_lossy(&output.stderr);
        bail!("docker failed: {}", stderr.trim());
    }
    Ok(String::from_utf8_lossy(&output.stdout).into_owned())
}