thag_rs 0.2.1

A versatile cross-platform playground and REPL for Rust snippets, expressions and programs. Accepts a script file or dynamic options.
Documentation 
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/// Run a command (in this case an integration test case to be debugged),
/// and capture and print its stdout and stderr concurrently in a
/// separate thread.
//# Purpose: Demo process::Command with output capture, debugging unit tests.
//# Categories: debugging, technique, testing
use env_logger::Builder;
use std::env;
use std::ffi::OsStr;
use std::io::Read;
use std::path::Path;
use std::process::{self, Command};

fn prog() -> Option<String> {
    env::args()
        .next()
        .as_ref()
        .map(Path::new)
        .and_then(Path::file_name)
        .and_then(OsStr::to_str)
        .map(String::from)
}

fn main() {
    Builder::new().filter_level(log::LevelFilter::Debug).init();

    eprintln!("Running {:#?}", prog().unwrap());
    // Define the command and arguments
    let mut cmd = Command::new("cargo");
    cmd.args(["run", "--", "-cvv", "demo/config.rs"]);

    // Redirect stdout to a pipe
    let mut child = cmd
        .stdout(process::Stdio::piped())
        .stderr(process::Stdio::piped())
        .spawn()
        .expect("failed to spawn command");

    // Read the captured output from the pipe
    let mut stdout = child.stdout.take().expect("failed to get stdout");
    let mut stderr = child.stderr.take().expect("failed to get stderr");

    let mut stdout_output = String::new();
    stdout
        .read_to_string(&mut stdout_output)
        .expect("failed to read stdout");

    println!("Captured stdout:\n{}", stdout_output);

    let mut stderr_output = String::new();
    stderr
        .read_to_string(&mut stderr_output)
        .expect("failed to read stderr");

    println!("Captured stderr:\n{}", stderr_output);

    // Wait for the child process to finish and get the exit status
    let status = child.wait().expect("failed to wait for child");

    // Check both the status and scan the output for error indicators
    if status.success()
        && !stderr_output.contains("error:")
        && !stderr_output.contains("Build failed")
    {
        println!("Command executed successfully");
    } else {
        eprintln!("Build failed!");
        if let Some(code) = status.code() {
            eprintln!("Exit code: {}", code);
        }
        // You might want to fail the test here
        panic!("Build failed when it should have succeeded");
        // Or if using a testing framework:
        // assert!(false, "Build failed when it should have succeeded");
    }
}