rustyroad 1.7.2

Rusty Road is a framework written in Rust that is based on Ruby on Rails. It is designed to provide the familiar conventions and ease of use of Ruby on Rails, while also taking advantage of the performance and efficiency of Rust.
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//! Locating and driving the real `tetherscript` binary.

use std::path::Path;
use std::process::Command;

/// Returns the `tetherscript` binary, or `None` when it is not installed.
///
/// A RustyRoad checkout cannot assume a separate project is installed, so the tests that
/// use this skip rather than fail when it is missing.
pub(super) fn binary() -> Option<String> {
    let candidate =
        std::env::var("TETHERSCRIPT_BIN").unwrap_or_else(|_| "tetherscript".to_string());

    Command::new(&candidate)
        .arg("--help")
        .output()
        .ok()
        .filter(|output| output.status.success())
        .map(|_| candidate)
}

/// Runs one subcommand over `path`, returning success and combined output.
///
/// The working directory is set explicitly rather than inherited. Other tests in this
/// crate change and remove the process's directory, and a spawned child inherits it —
/// which surfaces as `can't read current directory` from a binary that never looked at
/// the path we passed.
pub(super) fn run(binary: &str, subcommand: &str, path: &Path, directory: &Path) -> (bool, String) {
    let output = Command::new(binary)
        .arg(subcommand)
        .arg(path)
        .current_dir(directory)
        .output()
        .expect("tetherscript should run");

    let combined = format!(
        "{}{}",
        String::from_utf8_lossy(&output.stdout),
        String::from_utf8_lossy(&output.stderr)
    );

    (output.status.success(), combined)
}