/// Check whether a binary can be found in the most common paths on Unix-like systems.

/// We don't bother checking the `$PATH` variable, as we're only looking for very standard tools

/// and prefer not to make this too complex.

#[cfg(unix)]

fn exists(cmd: &str) -> bool {

    // Some common paths where system-installed binaries are found.

    const PATHS: &[&str] = &["/usr/local/bin", "/usr/bin", "/bin"];

    for dir in PATHS {

        if std::path::Path::new(dir).join(cmd).exists() {

            return true;

        }

    }

    false

}

/// Check whether a binary can be found on `$PATH`.

/// See:

///  - <https://devblogs.microsoft.com/scripting/weekend-scripter-where-exethe-what-why-and-how/>

///  - <https://learn.microsoft.com/windows-server/administration/windows-commands/where>

#[cfg(windows)]

fn exists(cmd: &str) -> bool {

    use std::os::windows::process::CommandExt;

    // See <https://learn.microsoft.com/windows/win32/procthread/process-creation-flags#flags>.

    const CREATE_NO_WINDOW: u32 = 0x08000000;

    std::process::Command::new("where.exe")

        .arg("/q")

        .arg("$PATH:".to_owned() + cmd)

        .creation_flags(CREATE_NO_WINDOW)

        .output()

        .map(|output| output.status.success())

        .unwrap_or_default()

}

    let rad = ctx.profile().home().path().join("bin").join("rad");

    if rad.exists() {

        return Ok(());

    }

    if exists("rad") {

        return Ok(());

    Err(Error::RadicleNotInstalled)