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// mcpp.log — file-based debug logger with verbose terminal output.
//
// Usage:
// mcpp::log::init(cfg); // call once at startup
// mcpp::log::debug("tag", "msg"); // writes to ~/.mcpp/log/mcpp.log
// mcpp::log::verbose("tag", "msg"); // file + stderr (when --verbose)
//
// Configuration (priority order):
// 1. MCPP_LOG_LEVEL env var: "debug" | "info" | "warn" | "error" | "off"
// 2. config.toml [log].level
// 3. Default: "off"
//
// Log file: <logDir>/mcpp.log (rotated at max_file_size, keeps max_files)
module;
#include <ctime>
#include <cstdio>
export module mcpp.log;
import std;
export namespace mcpp::log {
enum class Level { off, error, warn, info, debug };
struct Config {
Level level = Level::off;
std::size_t maxFileSize = 10 * 1024 * 1024; // 10MB
int maxFiles = 3;
std::filesystem::path logDir;
};
void init(const Config& cfg);
void debug(std::string_view tag, std::string_view message);
void info (std::string_view tag, std::string_view message);
void warn (std::string_view tag, std::string_view message);
void error(std::string_view tag, std::string_view message);
// verbose: writes to file (level >= info) AND stderr (when --verbose).
void set_verbose(bool v);
bool is_verbose();
void verbose(std::string_view tag, std::string_view message);
// Scoped verbose timer for diagnosing slow steps (e.g. first-run init / bootstrap
// hangs). Logs "<label>: start" on construction and "<label>: done (Δ=<ms>ms)" on
// destruction, via verbose() — always to the timestamped log file
// (~/.mcpp/log/mcpp.log), and to stderr under --verbose. Cheap: two log lines.
struct ScopedTimer {
std::string tag;
std::string label;
std::chrono::steady_clock::time_point t0;
ScopedTimer(std::string_view tag_, std::string_view label_);
~ScopedTimer();
ScopedTimer(const ScopedTimer&) = delete;
ScopedTimer& operator=(const ScopedTimer&) = delete;
// Emit an intermediate checkpoint: "<label>: <note> (+<ms>ms)".
void mark(std::string_view note) const;
};
// Check if a level is enabled (avoid constructing expensive messages).
bool is_enabled(Level l);
} // namespace mcpp::log
// ─── Implementation ─────────────────────────────────────────────────
namespace mcpp::log {
namespace {
Level g_level = Level::off;
bool g_verbose = false;
std::filesystem::path g_logFile;
std::size_t g_maxFileSize = 10 * 1024 * 1024;
int g_maxFiles = 3;
std::mutex g_mutex;
Level parse_level(const char* s) {
if (!s || !*s) return Level::off;
std::string v(s);
for (auto& c : v) c = static_cast<char>(std::tolower(static_cast<unsigned char>(c)));
if (v == "debug") return Level::debug;
if (v == "info") return Level::info;
if (v == "warn") return Level::warn;
if (v == "error") return Level::error;
return Level::off;
}
std::string timestamp() {
auto now = std::chrono::system_clock::now();
auto tt = std::chrono::system_clock::to_time_t(now);
auto ms = std::chrono::duration_cast<std::chrono::milliseconds>(
now.time_since_epoch()) % 1000;
std::tm tm{};
#if defined(_WIN32)
localtime_s(&tm, &tt);
#else
localtime_r(&tt, &tm);
#endif
char buf[32];
std::snprintf(buf, sizeof(buf), "%04d-%02d-%02d %02d:%02d:%02d.%03d",
tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday,
tm.tm_hour, tm.tm_min, tm.tm_sec, static_cast<int>(ms.count()));
return buf;
}
const char* level_str(Level l) {
switch (l) {
case Level::debug: return "DEBUG";
case Level::info: return "INFO ";
case Level::warn: return "WARN ";
case Level::error: return "ERROR";
default: return " ";
}
}
void rotate() {
if (g_logFile.empty() || g_maxFiles <= 0) return;
std::error_code ec;
auto size = std::filesystem::file_size(g_logFile, ec);
if (ec || size < g_maxFileSize) return;
// mcpp.log.2 → delete, mcpp.log.1 → mcpp.log.2, mcpp.log → mcpp.log.1
for (int i = g_maxFiles - 1; i >= 1; --i) {
auto src = g_logFile;
src += "." + std::to_string(i);
auto dst = g_logFile;
dst += "." + std::to_string(i + 1);
if (i == g_maxFiles - 1) {
std::filesystem::remove(src, ec);
} else {
std::filesystem::rename(src, dst, ec);
}
}
auto first = g_logFile;
first += ".1";
std::filesystem::rename(g_logFile, first, ec);
}
void write_log(Level level, std::string_view tag, std::string_view message) {
if (level > g_level || g_level == Level::off) return;
if (g_logFile.empty()) return;
std::lock_guard lock(g_mutex);
rotate();
std::ofstream ofs(g_logFile, std::ios::app);
if (!ofs) return;
ofs << timestamp() << " [" << level_str(level) << "] "
<< tag << ": " << message << '\n';
}
void write_stderr(std::string_view tag, std::string_view message) {
// Dim gray for verbose output so it doesn't compete with ui::status.
// Carry the wall-clock timestamp so a long first-run hang is attributable
// to a specific step from the live --verbose stream (the log file already
// has it). Grep-friendly: "[VERBOSE <ts>]".
std::fprintf(stderr, "\033[2m[VERBOSE %s] %.*s: %.*s\033[0m\n",
timestamp().c_str(),
static_cast<int>(tag.size()), tag.data(),
static_cast<int>(message.size()), message.data());
}
} // namespace
void init(const Config& cfg) {
// Priority: env var > --verbose > config > default
if (auto* e = std::getenv("MCPP_LOG_LEVEL"); e && *e) {
g_level = parse_level(e);
} else if (g_verbose && cfg.level == Level::off) {
g_level = Level::info; // --verbose auto-enables info
} else {
g_level = cfg.level;
}
g_maxFileSize = cfg.maxFileSize;
g_maxFiles = cfg.maxFiles;
if (g_level == Level::off && !g_verbose) return;
std::error_code ec;
std::filesystem::create_directories(cfg.logDir, ec);
g_logFile = cfg.logDir / "mcpp.log";
// Only write session marker on first init (avoid duplicate from re-init)
static bool session_started = false;
if (!session_started) {
session_started = true;
write_log(Level::info, "log",
std::format("=== session start (level={} verbose={}) ===",
level_str(g_level), g_verbose));
}
}
void set_verbose(bool v) {
g_verbose = v;
// If verbose enabled but file logging off, auto-enable info level
if (v && g_level == Level::off) {
g_level = Level::info;
if (!g_logFile.empty()) return;
// Deferred: logDir not set yet, init() will handle it
}
}
bool is_verbose() { return g_verbose; }
bool is_enabled(Level l) {
return l <= g_level && g_level != Level::off;
}
void debug(std::string_view tag, std::string_view message) {
write_log(Level::debug, tag, message);
}
void info(std::string_view tag, std::string_view message) {
write_log(Level::info, tag, message);
}
void warn(std::string_view tag, std::string_view message) {
write_log(Level::warn, tag, message);
}
void error(std::string_view tag, std::string_view message) {
write_log(Level::error, tag, message);
}
void verbose(std::string_view tag, std::string_view message) {
write_log(Level::info, tag, message);
if (g_verbose) {
write_stderr(tag, message);
}
}
ScopedTimer::ScopedTimer(std::string_view tag_, std::string_view label_)
: tag(tag_), label(label_), t0(std::chrono::steady_clock::now()) {
verbose(tag, std::format("{}: start", label));
}
ScopedTimer::~ScopedTimer() {
auto ms = std::chrono::duration_cast<std::chrono::milliseconds>(
std::chrono::steady_clock::now() - t0).count();
verbose(tag, std::format("{}: done (Δ={}ms)", label, ms));
}
void ScopedTimer::mark(std::string_view note) const {
auto ms = std::chrono::duration_cast<std::chrono::milliseconds>(
std::chrono::steady_clock::now() - t0).count();
verbose(tag, std::format("{}: {} (+{}ms)", label, note, ms));
}
} // namespace mcpp::log