tiny logging function (colors, source location, no macros)

logging.hpp

#include <format>
#include <iostream>
#include <source_location>
#include <string_view>
#include <tuple>
#include <unordered_map>

enum class LogLevel { DEBUG, INFO, WARNING, ERROR, CRITICAL };

namespace CLIColors {
constexpr auto Reset = "\e[0m";
namespace Foreground {
constexpr auto Yellow = "\e[33m";
constexpr auto Gray = "\e[90m";
constexpr auto Blue = "\e[34m";
constexpr auto Red = "\e[31m";
constexpr auto Cyan = "\e[36m";
}  // namespace Foreground
namespace Background {
constexpr auto Red = "\e[41m";
}
}  // namespace CLIColors

const std::unordered_map<LogLevel, std::pair<const char *, const char *>>
    levels = {{LogLevel::DEBUG, {CLIColors::Foreground::Gray, "DEBUG   "}},
              {LogLevel::INFO, {CLIColors::Foreground::Blue, "INFO    "}},
              {LogLevel::WARNING, {CLIColors::Foreground::Yellow, "WARNING "}},
              {LogLevel::ERROR, {CLIColors::Foreground::Red, "ERROR   "}},
              {LogLevel::CRITICAL, {CLIColors::Background::Red, "CRITICAL"}}};

void log(const LogLevel level,
          const std::string_view message,
          std::source_location location = std::source_location::current()) {
    auto [level_color, level_text] = levels.at(level);

    std::cerr << std::format(
        "[{}{}{}] [{}{}:{}:{}{}] (in {}) {}\n", level_color, level_text,
        CLIColors::Reset, CLIColors::Foreground::Cyan, location.file_name(),
        location.line(), location.column(), CLIColors::Reset,
        location.function_name(), message);
}