environment.h

/******************************************************************************
 * Copyright 2018 The Apollo Authors. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *****************************************************************************/

#ifndef CYBERTRON_COMMON_ENVIRONMENT_H_
#define CYBERTRON_COMMON_ENVIRONMENT_H_

#include <assert.h>
#include <string>
#include "cybertron/common/log.h"

namespace apollo {
namespace cybertron {
namespace common {

inline const std::string GetEnv(const std::string& var_name) {
  char* var = nullptr;
  var = getenv(var_name.c_str());
  if (var == nullptr) {
    // AWARN << "Environment variable ["<< var_name << "] not set";
    return std::string("");
  }
  return std::string(var);
}

inline const std::string WorkRoot() {
  std::string work_root = GetEnv("CYBERTRON_PATH");
  // ensure variable CYBERTRON_PATH has been set.
  // TODO(fengkaiwen01) need a better error handling mechanism
  // assert(!work_root.empty());
  if (work_root.empty()) {
    work_root = "/apollo/cybertron";
  }
  return work_root;
}

inline const std::string ModuleRoot() {
  std::string module_root = GetEnv("MODULE_PATH");
  if (module_root.empty()) {
    return WorkRoot();
  }

  if (module_root.back() != '/') {
    module_root += '/';
  }
  return module_root;
}

}  // namespace common
}  // namespace cybertron
}  // namespace apollo

#endif  // CYBERTRON_COMMON_ENVIRONMENT_H_