add some app infrastructure services

src/ConfigService.hpp

@@ -1,6 +1,47 @@
 
 #pragma once
 
+#include <libconfig.h++>
+
+#include <optional>
+#include <string>
+#include <vector>
+
+struct LoggerConfig {
+    std::string id;
+    std::vector<std::string> flagsEnabled;
+    bool showTime = false;
+    bool showSourceTrace = false;
+    bool coutEnabled = false;
+    bool fileEnabled = false;
+    std::string filePath;
+};
+
+struct AudioConfig {
+    uint32_t sampleRate;
+    uint32_t channels;
+    uint32_t stereoMode;
+    uint32_t bufferSize;
+    float pitchStandard;
+    int32_t midiHome;
+    int32_t notesPerOctave;
+};
+
 class ConfigService {
 
+public:
+
+    ConfigService(const std::string& filePath);
+    ~ConfigService() = default;
+
+    bool loadFromFile(const std::string& filePath);
+
+    bool getLoggerConfig(const std::string& id, LoggerConfig* loggerConfig) const;
+    const std::string& lastError() const;
+
+private:
+    bool parseLoggerConfig(const libconfig::Setting& loggerSetting, LoggerConfig* loggerConfig) const;
+
+    libconfig::Config config_;
+    std::string lastError_;
 };