first commit

include/Logger.hpp

@@ -0,0 +1,19 @@
+#pragma once
+#include <string>
+#include <functional>
+
+enum class LogTag { Info, Ok, Warn, Err };
+
+// Thread-safe console logger (stand-in for the python `push_log` + log_queue/SSE).
+// Also supports a "sink" callback so the Discord bot can mirror log lines into
+// a Discord channel/log command without polling a queue.
+class Logger {
+public:
+    using Sink = std::function<void(const std::string& ts, const std::string& msg, LogTag tag)>;
+
+    static void log(const std::string& msg, LogTag tag = LogTag::Info);
+    static void setSink(Sink sink);
+
+private:
+    static Sink sink_;
+};