def handle_invocation()

in Utilities/build-script-helper.py [0:0]
40 lines of code
15 McCabe index (conditional complexity)

def handle_invocation(swift_exec, args):
  swiftpm_args = get_swiftpm_options(args)

  env = os.environ
  # Set the toolchain used in tests at runtime
  env['SOURCEKIT_TOOLCHAIN_PATH'] = args.toolchain
  env['INDEXSTOREDB_TOOLCHAIN_BIN_PATH'] = args.toolchain
  # Use local dependencies (i.e. checked out next sourcekit-lsp).
  if not args.no_local_deps:
    env['SWIFTCI_USE_LOCAL_DEPS'] = "1"

  if args.ninja_bin:
    env['NINJA_BIN'] = args.ninja_bin

  if args.sanitize and 'address' in args.sanitize:
    # Workaround reports in Foundation: https://bugs.swift.org/browse/SR-12551
    env['ASAN_OPTIONS'] = 'detect_leaks=false'
  if args.sanitize and 'undefined' in args.sanitize:
    supp = os.path.join(args.package_path, 'Utilities', 'ubsan_supressions.supp')
    env['UBSAN_OPTIONS'] = 'halt_on_error=true,suppressions=%s' % supp
  if args.sanitize and 'thread' in args.sanitize:
    env['TSAN_OPTIONS'] = 'halt_on_error=true'

  print('Cleaning ' + args.build_path)
  shutil.rmtree(args.build_path, ignore_errors=True)

  env['SWIFT_EXEC'] = '%sc' % (swift_exec)

  if args.action == 'build':
    swiftpm('build', swift_exec, swiftpm_args, env)
  elif args.action == 'test':
    if not args.skip_long_tests:
      env['SOURCEKIT_LSP_ENABLE_LONG_TESTS'] = '1'
    bin_path = swiftpm_bin_path(swift_exec, swiftpm_args, env)
    tests = os.path.join(bin_path, 'sk-tests')
    print('Cleaning ' + tests)
    shutil.rmtree(tests, ignore_errors=True)
    test_args = swiftpm_args
    # Running the tests concurrently doesn't work with glibc 2.24 because of a
    # bug with posix_spawn called from Foundation, so it'll need to be disabled
    # or fixed when used there, according to @benlangmuir.
    test_args += ['--parallel']
    swiftpm('test', swift_exec, test_args, env)
  elif args.action == 'install':
    bin_path = swiftpm_bin_path(swift_exec, swiftpm_args, env)
    swiftpm_args += ['-Xswiftc', '-no-toolchain-stdlib-rpath']
    swiftpm('build', swift_exec, swiftpm_args, env)

    if not args.install_prefixes:
      args.install_prefixes = [args.toolchain]
    install(bin_path, args.install_prefixes, args.toolchain)
  else:
    assert False, 'unknown action \'{}\''.format(args.action)