cargo-checkmate 0.1.18

checkmate checks all the things - comprehensive out-of-the-box safety & hygiene checks.
Documentation 
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use std::path::PathBuf;

pub fn run(args: &[&str]) -> anyhow::Result<String> {
    use anyhow::Context;
    use anyhow_std::CommandAnyhow;
    use std::io::Write;
    use std::process::Command;

    let gitout = Command::new("git").args(args).output_anyhow()?;

    let errbytes = &gitout.stderr[..];

    // Echo any stderr output:
    std::io::stderr().write_all(errbytes)?;

    if gitout.status.success() && errbytes.is_empty() {
        String::from_utf8(gitout.stdout).with_context(|| "git output not utf8".to_string())
    } else {
        Err(anyhow::anyhow!(
            "git {} exit {}{}",
            args.join(" "),
            gitout
                .status
                .code()
                .map(|c| c.to_string())
                .unwrap_or_else(|| "???".to_string()),
            if errbytes.is_empty() {
                ""
            } else {
                " with stderr noise."
            }
        ))
    }
}

pub fn get_dir() -> anyhow::Result<PathBuf> {
    let s = run(&["rev-parse", "--git-dir"])?;
    Ok(PathBuf::from(s.trim_end()))
}

pub fn get_hook_path(hookname: &str) -> anyhow::Result<PathBuf> {
    Ok(get_dir()?.join("hooks").join(hookname))
}