minilog.hpp

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#pragma once
 
#include <chrono>
#include <format>
#include "Colour.hpp"
 
namespace minilog {
 
enum Level {
    Debug = 50,
    Info = 60,
    Warning = 70,
    Error = 80,
    Critical = 90
};
 
struct Config {
    Level level = Level::Debug;
};
 
inline Config& config() {
    // This should be fine:
    // * https://stackoverflow.com/a/185730
    // * https://stackoverflow.com/a/189162
    //
    // This is also consistent with getStreamConfigIdx in Colour.hpp. I vaguely remember running into this problem
    // because shouldPrintColour is static, while getStreamConfigIdx is inline.
    // I really should read up on what inline actually is, because I'm pretty sure I've misunderstood *something*
    static Config instance;
 
    return instance;
}
 
template <Level level>
consteval std::string_view levelToString() {
    if constexpr (level == Level::Debug) {
        return "debug";
    } else if constexpr (level == Level::Info) {
        return "info";
    } else if constexpr (level == Level::Warning) {
        return "warning";
    } else if constexpr (level == Level::Error) {
        return "error";
    } else if constexpr (level == Level::Critical) {
        return "critical";
    }
}
 
inline constexpr std::ostream& operator<<(std::ostream& ss, Level level) {
    if (level == Level::Debug) {
        ss << stc::colour::fg<stc::colour::FourBitColour::BRIGHT_BLACK>;
    } else if (level == Level::Info) {
        ss << stc::colour::fg<stc::colour::FourBitColour::BLUE>;
    } else if (level == Level::Warning) {
        ss << stc::colour::fg<stc::colour::FourBitColour::BRIGHT_YELLOW>;
    } else if (level == Level::Error) {
        ss << stc::colour::fg<stc::colour::FourBitColour::BRIGHT_RED>;
    } else if (level == Level::Critical) {
        ss << stc::colour::fg<stc::colour::FourBitColour::RED>;
    }
    return ss;
}
 
template <Level level, class... Args>
inline constexpr void log(const std::format_string<Args...>& fmt, Args&&... args) {
    if (config().level > level) {
        return;
    }
 
    // This is good enough:
    // https://stackoverflow.com/a/26909227
    //
    // This isn't going to win any performance awards by any metric, but it's good enough for now. 
    // Not sure if I'll ever revisit performance.
    std::cout 
        << level
        << std::format(
            "{:%T} | {:<8} | {}\n",
            std::chrono::floor<std::chrono::milliseconds>(
                std::chrono::system_clock::now()
            ),
            levelToString<level>(),
            std::format<Args...>(fmt, std::forward<Args>(args)...)
        )
        << stc::colour::reset;
}
 
 
template <class... Args>
inline constexpr void debug(const std::format_string<Args...>& format, Args&&... args) {
    log<Level::Debug, Args...>(format, std::forward<Args>(args)...);
}
 
template <class... Args>
inline constexpr void info(const std::format_string<Args...>& format, Args&&... args) {
    log<Level::Info, Args...>(format, std::forward<Args>(args)...);
}
 
template <class... Args>
inline constexpr void warn(const std::format_string<Args...>& format, Args&&... args) {
    log<Level::Warning, Args...>(format, std::forward<Args>(args)...);
}
 
template <class... Args>
inline constexpr void error(const std::format_string<Args...>& format, Args&&... args) {
    log<Level::Error, Args...>(format, std::forward<Args>(args)...);
}
 
template <class... Args>
inline constexpr void critical(const std::format_string<Args...>& format, Args&&... args) {
    log<Level::Critical, Args...>(format, std::forward<Args>(args)...);
}
 
}