Spawn.java

package com.goodworkalan.spawn;

import static org.testng.Assert.assertEquals;

import java.io.File;

import org.testng.annotations.Test;

public class SpawnTest {
    @Test
    public void cat() {
        Spawn<Slurp, Slurp> spawn = Spawn.spawn();

        // Throw an exception for all exit codes except 0.
        spawn.setUnexceptionalExitCodes(0);

        // Run in the directory /etc.
        spawn.setWorkingDirectory(new File("/etc"));

        try {
            // Run a program and get standard out, error and the exit code.
            Exit<Slurp, Slurp> exit = spawn.execute("cat", "resolve.conf");
            for (String line : exit.getStdOut().getLines()) {
                System.out.println(line);
            }
            assertEquals(exit.getCode(), 0);

            // We don't really need to check the error code, it is turned
            // into an exception for unless the code is "unexceptional" above.
            for (String line : spawn.execute("cat", "hosts").getStdOut().getLines()) {
                System.out.println(line);
            }

            // Spawn itself acts as the environment.
            spawn.setWorkingDirectory(new File("."));

            // We can run commands and react only to exceptions.
            spawn.execute("touch", "monkey.txt");
        } catch (SpawnException e) {
            // Error processing all in one place.
            System.out.println(e.getCommandLine().get(0) + " " + e.getCode());
        }

    }
}