libsaria: Create a parallel queue as a Playlist

My goal is to slowly phase in use of a Playlist class.  This patch
begins this effort by creating the Playlist class and changing the queue
code to load queue.q as a playlist in addition to the queue's hardcoded
list.

Signed-off-by: Bryan Schumake <bjschuma@gmail.com>

include/libsaria/playlist.h

@@ -0,0 +1,28 @@
+// Copyright (c) 2012 Bryan Schumaker.
+#ifndef LIBSARIA_PLAYLIST_H
+#define LIBSARIA_PLAYLIST_H
+
+#include <libsaria/path.h>
+
+#include <list>
+#include <string>
+using namespace std;
+
+namespace libsaria
+{
+
+	class Playlist {
+		private:
+			string filename;
+			list<sid_t> plist;
+
+		public:
+			Playlist(string);
+			~Playlist();
+
+			void load();
+	};
+
+}; /* Namespace: libsaria */
+
+#endif /* LIBSARIA_PLAYLIST_H */

libsaria/playlist/file.cpp

@@ -0,0 +1,30 @@
+// Copyright (c) 2012 Bryan Schumaker.
+#include <libsaria/playlist.h>
+
+namespace libsaria
+{
+
+	void Playlist::load()
+	{
+		unsigned int size;
+		sid_t songid;
+		InFile in(filename);
+
+		if (!in.good())
+			return;
+		in >> size;
+
+		for (unsigned int i = 0; i < size; i++) {
+			in >> songid;
+			plist.push_back(songid);
+		}
+	}
+
+}; /* Namespace: libsaria */
+
+void load_playlist(void *plist)
+{
+	libsaria::Playlist *playlist = (libsaria::Playlist *)plist;
+	playlist->load();
+}
+

libsaria/playlist/playlist.cpp

@@ -0,0 +1,20 @@
+// Copyright (c) 2012 Bryan Schumaker.
+#include <libsaria/files.h>
+#include <libsaria/playlist.h>
+#include "playlist.h"
+
+namespace libsaria
+{
+
+	Playlist::Playlist(string file)
+	{
+		filename = file;
+		LoadTask *task = new LoadTask(load_playlist, this);
+		task->queue();
+	}
+
+	Playlist::~Playlist()
+	{
+	}
+
+}

libsaria/playlist/playlist.h

@@ -0,0 +1,7 @@
+// Copyright (c) 2012 Bryan Schumaker.
+#ifndef LIBSARIA_PLAYLIST_INTERNAL_H
+#define LIBSARIA_PLAYLIST_INTERNAL_H
+
+void load_playlist(void *);
+
+#endif /* LIBSARIA_PLAYLIST_INTERNAL_H */

libsaria/queue/queue.cpp

@@ -5,9 +5,11 @@ using namespace std;
 #include <libsaria/queue.h>
 #include <libsaria/library.h>
 #include <libsaria/callback.h>
+#include <libsaria/playlist.h>
 #include "queue.h"
 
 list<sid_t> playqueue;
+libsaria::Playlist queue("queue.q");
 
 static void save_and_refresh()
 {