Future runProtected()

in lib/src/command/global_activate.dart [53:149]
77 lines of code
17 McCabe index (conditional complexity)

  Future<void> runProtected() async {
    // Default to `null`, which means all executables.
    List<String>? executables;
    if (argResults.wasParsed('executable')) {
      if (argResults.wasParsed('no-executables')) {
        usageException('Cannot pass both --no-executables and --executable.');
      }

      executables = argResults['executable'];
    } else if (argResults['no-executables']) {
      // An empty list means no executables.
      executables = [];
    }

    var features = <String, FeatureDependency>{};
    for (var feature in argResults['features'] ?? []) {
      features[feature] = FeatureDependency.required;
    }
    for (var feature in argResults['omit-features'] ?? []) {
      if (features.containsKey(feature)) {
        usageException('Cannot both enable and disable $feature.');
      }

      features[feature] = FeatureDependency.unused;
    }

    final overwrite = argResults['overwrite'] as bool;
    Uri? hostedUrl;
    if (argResults.wasParsed('hosted-url')) {
      try {
        hostedUrl = validateAndNormalizeHostedUrl(argResults['hosted-url']);
      } on FormatException catch (e) {
        usageException('Invalid hosted-url: $e');
      }
    }

    Iterable<String> args = argResults.rest;

    String readArg([String error = '']) {
      if (args.isEmpty) usageException(error);
      var arg = args.first;
      args = args.skip(1);
      return arg;
    }

    void validateNoExtraArgs() {
      if (args.isEmpty) return;
      var unexpected = args.map((arg) => '"$arg"');
      var arguments = pluralize('argument', unexpected.length);
      usageException('Unexpected $arguments ${toSentence(unexpected)}.');
    }

    switch (argResults['source']) {
      case 'git':
        var repo = readArg('No Git repository given.');
        // TODO(rnystrom): Allow passing in a Git ref too.
        validateNoExtraArgs();
        return globals.activateGit(repo, executables,
            features: features, overwriteBinStubs: overwrite);

      case 'hosted':
        var package = readArg('No package to activate given.');

        // Parse the version constraint, if there is one.
        var constraint = VersionConstraint.any;
        if (args.isNotEmpty) {
          try {
            constraint = VersionConstraint.parse(readArg());
          } on FormatException catch (error) {
            usageException(error.message);
          }
        }

        validateNoExtraArgs();
        return globals.activateHosted(package, constraint, executables,
            features: features, overwriteBinStubs: overwrite, url: hostedUrl);

      case 'path':
        if (features.isNotEmpty) {
          // Globally-activated path packages just use the existing lockfile, so
          // we can't change the feature selection.
          usageException('--features and --omit-features may not be used with '
              'the path source.');
        }

        var path = readArg('No package to activate given.');
        validateNoExtraArgs();
        return globals.activatePath(
          path,
          executables,
          overwriteBinStubs: overwrite,
          analytics: analytics,
        );
    }

    throw StateError('unreachable');
  }