Some refactoring.

src/core/Logger.cpp

@@ -0,0 +1,41 @@
+#include <core/Logger.h>
+
+#include <iostream>
+
+
+LogStream::LogStream(std::ostream& out)
+    : m_out(out) {
+}
+
+LogStream::~LogStream() {
+    m_out << "\033[m\n" << std::flush;
+}
+
+
+Logger::Logger() {
+}
+
+Logger::~Logger() {
+}
+
+LogStream Logger::error() {
+    std::clog << "\033[31m";
+    return LogStream(std::clog);
+}
+
+LogStream Logger::warning() {
+    std::clog << "\033[33m";
+    return LogStream(std::clog);
+}
+
+LogStream Logger::info() {
+    // std::clog << "\033[37m";
+    return LogStream(std::clog);
+}
+
+LogStream Logger::debug() {
+    std::clog << "\033[2m";
+    return LogStream(std::clog);
+}
+
+Logger logger;