rename some files to snake_case

client/metadata.hpp

@@ -0,0 +1,103 @@
+/***
+    This file is part of snapcast
+    Copyright (C) 2014-2019  Johannes Pohl
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#ifndef METADATA_H
+#define METADATA_H
+
+#include "common/json.hpp"
+
+// Prefix used in output
+#define METADATA std::string("metadata")
+
+/*
+ * Implement a generic metadata output handler
+ */
+using json = nlohmann::json;
+
+/*
+ * Base class, prints to stdout
+ */
+class MetadataAdapter
+{
+public:
+    MetadataAdapter()
+    {
+        reset();
+    }
+
+    virtual ~MetadataAdapter() = default;
+
+    void reset()
+    {
+        msg_.reset(new json);
+    }
+
+    std::string serialize()
+    {
+        return METADATA + ":" + msg_->dump();
+    }
+
+    void tag(std::string name, std::string value)
+    {
+        (*msg_)[name] = value;
+    }
+
+    std::string operator[](std::string key)
+    {
+        try
+        {
+            return (*msg_)[key];
+        }
+        catch (std::domain_error&)
+        {
+            return std::string();
+        }
+    }
+
+    virtual int push()
+    {
+        std::cout << serialize() << "\n";
+        return 0;
+    }
+
+    int push(json& jtag)
+    {
+        msg_.reset(new json(jtag));
+        return push();
+    }
+
+protected:
+    std::shared_ptr<json> msg_;
+};
+
+/*
+ * Send metadata to stderr as json
+ */
+class MetaStderrAdapter : public MetadataAdapter
+{
+public:
+    using MetadataAdapter::push;
+
+    int push() override
+    {
+        std::cerr << serialize() << "\n";
+        return 0;
+    }
+};
+
+#endif