Echo Writes Code

shell.cpp

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#include "crucible/test/shell.hpp"

#include "crucible/core/result.hpp"
#include "crucible/test/reporter.hpp"
#include "crucible/test/suite.hpp"

#include <cstring>
#include <exception>
#include <iostream>
#include <set>
#include <string>

namespace crucible
{
  namespace
  {
    struct InvalidArgument
    {
      String argument {};

      [[nodiscard]] auto describe() const -> String;
    };

    auto InvalidArgument::describe() const -> String
    {
      return String { "Invalid argument: " + argument };
    }

    struct MissingGroupName
    {
      [[nodiscard]] auto describe() const -> String;
    };

    auto MissingGroupName::describe() const -> String
    {
      return String { "Missing group name after -g or --group option" };
    }

    using ConfigurationError = Error<InvalidArgument, MissingGroupName>;

    enum class ConfigurationState
    {
      Ready,
      WantGroupName,
    };

    struct Configuration
    {
      ConfigurationState state { ConfigurationState::Ready };

      std::set<String> group_filter {};

      bool show_fixtures { false };
    };

    using ConfigurationResult = Result<ConfigurationError, Configuration>;

    [[nodiscard]]
    auto make_invalid_argument(String const &argument) -> ConfigurationError
    {
      return InvalidArgument { argument };
    }

    [[nodiscard]]
    auto make_missing_group_name() -> ConfigurationError
    {
      return MissingGroupName {};
    }

    [[nodiscard]]
    auto handle_next_option(Configuration configuration, String const &argument) -> ConfigurationResult
    {
      if (argument == "--show-fixtures") {
        configuration.show_fixtures = true;
        return make_success(std::move(configuration));
      }

      if (argument == "-g" || argument == "--group") {
        configuration.state = ConfigurationState::WantGroupName;
        return make_success(std::move(configuration));
      }

      return make_failure(make_invalid_argument(argument));
    }

    [[nodiscard]]
    auto handle_group_name(Configuration configuration, String const &argument) -> ConfigurationResult
    {
      configuration.state = ConfigurationState::Ready;
      configuration.group_filter.emplace(argument);
      return make_success(std::move(configuration));
    }

    [[nodiscard]]
    auto parse_configuration(Configuration configuration, String const &argument) -> ConfigurationResult
    {
      switch (configuration.state) {
      case ConfigurationState::Ready:
        return handle_next_option(std::move(configuration), argument);

      case ConfigurationState::WantGroupName:
        return handle_group_name(std::move(configuration), argument);
      }

      CRUCIBLE_ASSERT_UNREACHABLE();
    }

    [[nodiscard]]
    auto check_configuration(Configuration configuration) -> ConfigurationResult
    {
      switch (configuration.state) {
      case ConfigurationState::Ready:
        return make_success(std::move(configuration));

      case ConfigurationState::WantGroupName:
        return make_failure(make_missing_group_name());
      }

      CRUCIBLE_ASSERT_UNREACHABLE();
    }

    [[nodiscard]]
    auto print_error_and_usage(std::string const &executable, ConfigurationError const &error) -> ExitStatus
    {
      std::cerr
        << "Error parsing command line: " << into_std_string(error.describe()) << "\n"
        << "Usage: " << executable << " [--show-fixtures] [-g|--group GROUP]...\n";

      return ExitStatus::Failure;
    }

    [[nodiscard]]
    auto run_tests(Configuration const &configuration) -> ExitStatus
    {
      suite().set_group_filter(configuration.group_filter);

      auto reporter { make_console_reporter() };
      reporter.set_show_fixtures(configuration.show_fixtures);

      bool const all_passed { suite.execute(reporter) };

      if (all_passed) {
        return ExitStatus::Success;
      } else {
        return ExitStatus::Failure;
      }
    }
  }

  auto launch(std::string const &suite_name, ImmutableView<String> const arguments) -> ExitStatus
  {
    suite().set_name(suite_name);

    CRUCIBLE_ASSERT_GT(arguments.size(), 0);
    std::string const executable { into_std_string(arguments[0]) };

    auto const handle_failure {
      [&executable](ConfigurationError const &error) {
        return print_error_and_usage(executable, error);
      }
    };

    auto const handle_success {
      [](Configuration const &configuration) {
        return run_tests(configuration);
      }
    };

    return iterate(arguments.take_from(1))
      .try_fold(parse_configuration, Configuration {})
      .take_success_then(check_configuration)
      .resolve(handle_failure, handle_success);
  }
}