util.hpp

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// Copyright 2022 Arthur Sonzogni. All rights reserved.
// Use of this source code is governed by the MIT license that can be found in
// the LICENSE file.
#ifndef FTXUI_SCREEN_UTIL_HPP
#define FTXUI_SCREEN_UTIL_HPP
 
#include <cstdlib>  // for getenv
 
namespace ftxui::util {
 
// Similar to std::clamp, but allow hi to be lower than lo.
template <class T>
constexpr const T& clamp(const T& v, const T& lo, const T& hi) {
  return v < lo ? lo : hi < v ? hi : v;
}
 
// Returns the value of the environment variable |name|, or "" if unset.
inline const char* GetEnv(const char* name) {
  // The Microsoft CRT marks std::getenv as deprecated.
#if defined(__clang__)
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wdeprecated-declarations"
#elif defined(_MSC_VER)
#pragma warning(push)
#pragma warning(disable : 4996)
#endif
  const char* value = std::getenv(name);  // NOLINT
#if defined(__clang__)
#pragma clang diagnostic pop
#elif defined(_MSC_VER)
#pragma warning(pop)
#endif
  return value ? value : "";
}
 
}  // namespace ftxui::util
 
#endif /* end of include guard: FTXUI_SCREEN_UTIL_HPP */