Add bin and launcher

changelog-fetcher

@@ -0,0 +1,4 @@
+#!/usr/bin/env php
+<?php
+
+require __DIR__ . '/changelog_fetcher.php';

changelog_fetcher.php

@@ -0,0 +1,39 @@
+<?php
+// Copied this from drush/drush.
+
+use Symfony\Component\Console\Application;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\DependencyInjection\Reference;
+use Violinist\ChangelogFetcher\ChangelogRetriever;
+use Violinist\ChangelogFetcher\FetchCommand;
+use Violinist\ChangelogFetcher\ProcessFactory;
+
+$cwd = isset($_SERVER['PWD']) && is_dir($_SERVER['PWD']) ? $_SERVER['PWD'] : getcwd();
+// Set up autoloader
+$loader = false;
+if (file_exists($autoloadFile = __DIR__ . '/vendor/autoload.php')
+    || file_exists($autoloadFile = __DIR__ . '/../autoload.php')
+    || file_exists($autoloadFile = __DIR__ . '/../../autoload.php')
+) {
+    $loader = include_once($autoloadFile);
+} else {
+    throw new \Exception("Could not locate autoload.php. cwd is $cwd; __DIR__ is " . __DIR__);
+}
+
+
+$app = new Application();
+$container = new ContainerBuilder();
+
+$container->register('process_factory', ProcessFactory::class);
+
+$container->register('changelog_retriever', ChangelogRetriever::class)
+    ->addArgument(new Reference('dependency_repo_retriever'))
+    ->addArgument(new Reference('process_factory'));
+$container->register('dependency_repo_retriever', \Violinist\ChangelogFetcher\DependencyRepoRetriever::class)
+    ->addArgument(new Reference('process_factory'));
+
+$app->add(new FetchCommand($container->get('changelog_retriever')));
+
+$app->setName('changelog-fetcher');
+
+$app->run();