libsaria: Create a Playlist stack

My goal is to eventually pick songs from whatever is on top of the
playlist stack.  Right now, only the library is added and no songs are
picked.

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

include/libsaria/library.h

@@ -35,6 +35,7 @@ namespace libsaria
 			unsigned int size;
 		};
 
+		void init();
 		void load();
 		void save();
 		void update();

include/libsaria/stack.h

@@ -0,0 +1,13 @@
+#ifndef LIBSARIA_PLAYLIST_STACK_H
+#define LIBSARIA_PLAYLIST_STACK_H
+
+#include <libsaria/playlist.h>
+
+namespace libsaria
+{
+
+	void stack_playlist(Playlist *);
+
+}; /* Namespace: libsaria */
+
+#endif /* LIBSARIA_PLAYLIST_STACK_H */

libsaria/library/library.cpp

@@ -7,6 +7,7 @@ using namespace std;
 #include <libsaria/callback.h>
 #include <libsaria/library.h>
 #include <libsaria/playlist.h>
+#include <libsaria/stack.h>
 #include "library.h"
 
 list<libsaria::LibraryPath> path_list;
@@ -32,6 +33,12 @@ static void do_update(libsaria::LibraryPath *path)
 namespace libsaria
 {
 
+	void library::init()
+	{
+		load();
+		stack_playlist(&lib_playlist);
+	}
+
 	void library::for_each_path(void (*info_func)(struct library::PathInfo &))
 	{
 		list<LibraryPath>::iterator it;

libsaria/libsaria.cpp

@@ -22,7 +22,7 @@ namespace libsaria
 		audio::init(argc, argv);
 		println("saria dir: %s", get_saria_dir().c_str());
 		make_saria_dir();
-		libsaria::library::load();
+		libsaria::library::init();
 		libsaria::queue::load();
 	}
 

libsaria/playlist/stack.cpp

@@ -0,0 +1,17 @@
+// Copyright (c) 2012 Bryan Schumaker.
+#include <libsaria/playlist.h>
+
+#include <list>
+using namespace std;
+
+static list<libsaria::Playlist *> playlist_stack;
+
+namespace libsaria
+{
+
+	void stack_playlist(Playlist *plist)
+	{
+		playlist_stack.push_front(plist);
+	}
+
+}; /* Namespace: libsaria */