Theme system

Solves #1

Can choose between QtCreator's themes and base Vivy theme, or system's theme.

Depends on !21 (merged)

src/Lib/Log.cc

@@ -5,6 +5,39 @@ using namespace Vivy;
 LogSink::~LogSink() noexcept {}
 LogMessage::~LogMessage() noexcept { parentLogger->sendLogMessage(*this); }
 
+const chrono::milliseconds
+LogMessage::getTimeStamp() const noexcept
+{
+    return timeStamp;
+}
+
+LogMessage::Header const &
+LogMessage::getHeader() const noexcept
+{
+    return messageHeader;
+}
+
+const std::string_view
+LogMessage::getTextBuffer() const noexcept
+{
+    const char *txt = textBuffer.data();
+    return std::string_view{ txt, strlen(txt) };
+}
+
+void
+Logger::sendLogMessage(const LogMessage &msg) const noexcept
+{
+    parentLogSink->recieveLogMessage(this, msg);
+}
+
+// Get the log message from the logger and add it to the sink's queue.
+void
+LogSink::recieveLogMessage(const Logger *const logger, LogMessage const &msg) noexcept
+{
+    const std::lock_guard<std::mutex> messageQueueLockGuard(messageQueueLock);
+    messageQueue.emplace_back(msg);
+}
+
 std::shared_ptr<LogSink>
 LogSink::newSink() noexcept
 {
@@ -45,11 +78,6 @@ Logger::logEvent(const char *fileName, const char *functionName, const int lineN
                                                 .lineNumberInFile = lineNumber });
 }
 
-void
-Logger::sendLogMessage(const LogMessage &msg) const noexcept {
-    TODO(Write the code to send the event...)
-}
-
 LogMessage::LogMessage(Logger *const logger, const LogMessage::Header hdr) noexcept
     : messageHeader(hdr)
     , parentLogger(logger)
@@ -57,19 +85,37 @@ LogMessage::LogMessage(Logger *const logger, const LogMessage::Header hdr) noexc
 }
 
 LogMessage &
-LogMessage::operator<<(const std::string &) noexcept
+LogMessage::operator<<(const std::string &msg) noexcept
 {
-    return *this;
+    return (*this << msg.c_str());
 }
 
 LogMessage &
-LogMessage::operator<<(const int) noexcept
+LogMessage::operator<<(const QString &msg) noexcept
 {
-    return *this;
+    return (*this << msg.toStdString());
+}
+
+LogMessage &
+LogMessage::operator<<(const int i) noexcept
+{
+    return (*this << static_cast<long>(i));
+}
+
+LogMessage &
+LogMessage::operator<<(const long i) noexcept
+{
+    return (*this << std::to_string(i));
 }
 
 LogMessage &
-LogMessage::operator<<(const long) noexcept
+LogMessage::operator<<(const char *str) noexcept
 {
+    const std::size_t length = strlen(str);
+    for (std::size_t i = 0; (i < length) && (indexInArray < messageBufferLength - 1);
+         ++i, ++indexInArray) {
+        textBuffer[indexInArray] = str[i];
+    }
+    textBuffer[indexInArray] = '\0';
     return *this;
 }