Adding logging system

5 files changed, 186 insertions, 2 deletions

diff --git a/yage/core/logger.cpp b/yage/core/logger.cpp
new file mode 100644
index 00000000..f64b908b
--- /dev/null
+++ b/yage/core/logger.cpp
@@ -0,0 +1,37 @@
+/* ----------------------------------------------------------------------------
+ * logger.cpp
+ *
+ * Copyright (c) 2017 Yann Herklotz Grave <ymherklotz@gmail.com> -- MIT License
+ * See file LICENSE for more details
+ * ----------------------------------------------------------------------------
+ */
+
+#include "logger.h"
+
+#include <iostream>
+#include <string>
+
+using namespace std;
+
+namespace yage
+{
+
+LogMessage Logger::operator()()
+{
+    return LogMessage(this);
+}
+
+void Logger::flush(const LogMessage &msg)
+{
+    string asString(msg.buffer_.str());
+    cout << asString << "\n";
+}
+
+Logger &Logger::instance()
+{
+    static Logger gLogger;
+
+    return gLogger;
+}
+
+} // namespace yage
diff --git a/yage/core/logger.h b/yage/core/logger.h
index 90a958d5..e7187a81 100644
--- a/yage/core/logger.h
+++ b/yage/core/logger.h
@@ -1,6 +1,29 @@
-#ifndef YAGE_LOGGER_H
-#define YAGE_LOGGER_H
+/* ----------------------------------------------------------------------------
+ * logger.h
+ *
+ * Copyright (c) 2017 Yann Herklotz Grave <ymherklotz@gmail.com> -- MIT License
+ * See file LICENSE for more details
+ * ----------------------------------------------------------------------------
+ */
 
+#ifndef YAGE_CORE_LOGGER_H
+#define YAGE_CORE_LOGGER_H
 
+#include "logmessage.h"
+
+namespace yage
+{
+
+class Logger
+{
+public:
+    LogMessage operator()();
+
+    void flush(const LogMessage &msg);
+
+    static Logger &instance();
+};
+
+} // namespace yage
 
 #endif
diff --git a/yage/core/logmessage.cpp b/yage/core/logmessage.cpp
new file mode 100644
index 00000000..aa512042
--- /dev/null
+++ b/yage/core/logmessage.cpp
@@ -0,0 +1,32 @@
+/* ----------------------------------------------------------------------------
+ * logmessage.cpp
+ *
+ * Copyright (c) 2017 Yann Herklotz Grave <ymherklotz@gmail.com> -- MIT License
+ * See file LICENSE for more details
+ * ----------------------------------------------------------------------------
+ */
+
+#include "logmessage.h"
+#include "logger.h"
+
+namespace yage
+{
+
+LogMessage::LogMessage(Logger *owner) : owner_(owner) {}
+
+LogMessage::LogMessage(LogMessage &&msg) : owner_(std::move(msg.owner_)) {}
+
+LogMessage::~LogMessage()
+{
+    if (owner_ != nullptr) {
+        owner_->flush(*this);
+    }
+}
+
+LogMessage &LogMessage::operator<<(std::ostream &(*fn)(std::ostream &os))
+{
+    fn(buffer_);
+    return *this;
+}
+
+} // namespace yage
diff --git a/yage/core/logmessage.h b/yage/core/logmessage.h
new file mode 100644
index 00000000..ded40c19
--- /dev/null
+++ b/yage/core/logmessage.h
@@ -0,0 +1,65 @@
+/* ----------------------------------------------------------------------------
+ * logmessage.h
+ *
+ * Copyright (c) 2017 Yann Herklotz Grave <ymherklotz@gmail.com> -- MIT License
+ * See file LICENSE for more details
+ * ----------------------------------------------------------------------------
+ */
+
+#ifndef YAGE_CORE_LOGMESSAGE_H
+#define YAGE_CORE_LOGMESSAGE_H
+
+#include <memory>
+#include <sstream>
+#include <string>
+
+namespace yage
+{
+
+class Logger;
+
+class LogMessage
+{
+public:
+    ~LogMessage();
+
+    LogMessage(const LogMessage &msg) = delete;
+
+    LogMessage &operator=(const LogMessage &msg) = delete;
+    LogMessage &operator=(LogMessage &&msg) = delete;
+
+    template <typename T>
+    LogMessage &operator<<(const T &value);
+
+    LogMessage &operator<<(std::ostream &(*fn)(std::ostream &os));
+
+    struct Meta {
+        std::string fileName;
+        int lineNo;
+    };
+
+private:
+    friend class Logger;
+
+    std::ostringstream buffer_;
+    Logger *owner_;
+
+    LogMessage(Logger *owner);
+    LogMessage(LogMessage &&msg);
+};
+
+/* -----------------------------------------------------------------------------
+ * Template definitions
+ * -----------------------------------------------------------------------------
+ */
+
+template <typename T>
+LogMessage &LogMessage::operator<<(const T &value)
+{
+    buffer_ << value;
+    return *this;
+}
+
+} // namespace yage
+
+#endif
diff --git a/yage/core/logsink.h b/yage/core/logsink.h
new file mode 100644
index 00000000..bdfc70cf
--- /dev/null
+++ b/yage/core/logsink.h
@@ -0,0 +1,27 @@
+/* ----------------------------------------------------------------------------
+ * logger.cpp
+ *
+ * Copyright (c) 2017 Yann Herklotz Grave <ymherklotz@gmail.com> -- MIT License
+ * See file LICENSE for more details
+ * ----------------------------------------------------------------------------
+ */
+
+#ifndef YAGE_CORE_LOGSINK_H
+#define YAGE_CORE_LOGSINK_H
+
+#include "logmessage.h"
+
+#include <string>
+
+namespace yage
+{
+
+class LogSink
+{
+public:
+    void operator()(const LogMessage::Meta &, const std::string &message);
+};
+
+} // namespace yage
+
+#endif