public int runMainWithExitCode()

in src/com/facebook/buck/cli/Main.java [326:441]
95 lines of code
10 McCabe index (conditional complexity)

  public int runMainWithExitCode(File projectRoot, Optional<NGContext> context, String... args) throws IOException {
    if (args.length == 0) {
      return usage();
    }

    // Create common command parameters. projectFilesystem initialization looks odd because it needs
    // ignorePaths from a BuckConfig instance, which in turn needs a ProjectFilesystem (i.e. this
    // solves a bootstrapping issue).
    ProjectFilesystem projectFilesystem = new ProjectFilesystem(
        projectRoot,
        createBuckConfig(new ProjectFilesystem(projectRoot), platform).getIgnorePaths());
    BuckConfig config = createBuckConfig(projectFilesystem, platform);
    Verbosity verbosity = VerbosityParser.parse(args);
    Optional<String> color;
    if (context.isPresent() && (context.get().getEnv() != null)) {
      String colorString = context.get().getEnv().getProperty(BUCKD_COLOR_DEFAULT_ENV_VAR);
      color = Optional.fromNullable(colorString);
    } else {
      color = Optional.absent();
    }
    final Console console = new Console(verbosity, stdOut, stdErr, config.createAnsi(color));
    KnownBuildRuleTypes knownBuildRuleTypes = new KnownBuildRuleTypes();

    // Create or get and invalidate cached command parameters.
    Parser parser;
    if (context.isPresent()) {
      // Wire up daemon to new client and console and get cached Parser.
      Daemon daemon = getDaemon(projectFilesystem, config, console);
      daemon.watchClient(context.get());
      daemon.watchFileSystem(console);
      daemon.initWebServer(); // TODO(user): avoid webserver initialization on each command?
      parser = daemon.getParser();
    } else {
      // Initialize logging and create new Parser for new process.
      JavaUtilsLoggingBuildListener.ensureLogFileIsWritten();
      parser = new Parser(projectFilesystem,
          knownBuildRuleTypes,
          console,
          config.getPythonInterpreter(),
          config.getTempFilePatterns(),
          createRuleKeyBuilderFactory(config,
              new DefaultFileHashCache(projectFilesystem, console)));
    }

    Clock clock = new DefaultClock();
    final BuckEventBus buildEventBus = new BuckEventBus(
        clock,
         /* buildId */ MoreStrings.createRandomString());

    // Find and execute command.
    Optional<Command> command = Command.getCommandForName(args[0], console);
    if (command.isPresent()) {
      ImmutableList<BuckEventListener> eventListeners =
          addEventListeners(buildEventBus,
              clock,
              projectFilesystem,
              console,
              config,
              getWebServerIfDaemon(context));
      String[] remainingArgs = new String[args.length - 1];
      System.arraycopy(args, 1, remainingArgs, 0, remainingArgs.length);

      Command executingCommand = command.get();
      String commandName = executingCommand.name().toLowerCase();

      buildEventBus.post(CommandEvent.started(commandName, context.isPresent()));

      // The ArtifactCache is constructed lazily so that we do not try to connect to Cassandra when
      // running commands such as `buck clean`.
      ArtifactCacheFactory artifactCacheFactory = new ArtifactCacheFactory() {
        @Override
        public ArtifactCache newInstance(AbstractCommandOptions options) {
          if (options.isNoCache()) {
            return new NoopArtifactCache();
          } else {
            buildEventBus.post(ArtifactCacheConnectEvent.started());
            ArtifactCache artifactCache = new LoggingArtifactCacheDecorator(buildEventBus)
                .decorate(options.getBuckConfig().createArtifactCache(buildEventBus));
            buildEventBus.post(ArtifactCacheConnectEvent.finished());
            return artifactCache;
          }
        }
      };

      int exitCode = executingCommand.execute(remainingArgs, config, new CommandRunnerParams(
          console,
          projectFilesystem,
          new KnownBuildRuleTypes(),
          artifactCacheFactory,
          buildEventBus,
          parser,
          platform));

      buildEventBus.post(CommandEvent.finished(commandName, context.isPresent(), exitCode));

      ExecutorService buildEventBusExecutor = buildEventBus.getExecutorService();
      buildEventBusExecutor.shutdown();
      try {
        buildEventBusExecutor.awaitTermination(15, TimeUnit.SECONDS);
      } catch (InterruptedException e) {
        // Give the eventBus 15 seconds to finish dispatching all events, but if they should fail
        // to finish in that amount of time just eat it, the end user doesn't care.
      }
      for (BuckEventListener eventListener : eventListeners) {
        eventListener.outputTrace();
      }
      return exitCode;
    } else {
      int exitCode = new GenericBuckOptions(stdOut, stdErr).execute(args);
      if (exitCode == GenericBuckOptions.SHOW_MAIN_HELP_SCREEN_EXIT_CODE) {
        return usage();
      } else {
        return exitCode;
      }
    }
  }