libsaria: Create library and track counters

I plan on using (library, track) ids as a way of storing playlists.  I
made both counters unsigned ints, since I'm willing to bet that people
won't have 4,294,967,295 songs or library paths...

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

include/libsaria/library.h

@@ -17,6 +17,8 @@ namespace libsaria
 
 		struct Path {
 			bool visible;
+			unsigned int id;
+			unsigned int next_track;
 			string path;
 			list<Track> tracks;
 		};

include/libsaria/track.h

@@ -19,6 +19,7 @@ namespace libsaria
 			string comment;
 			string genre;
 			string lenstr;
+			unsigned int id;
 			unsigned int year;
 			unsigned int track;
 			unsigned int count;

libsaria/library/library.cpp

@@ -15,6 +15,7 @@ using namespace std;
 #include <libsaria/playlist.h>
 #include <libsaria/stack.h>*/
 
+static int next_id = 0;
 static list<struct libsaria::library::Path> path_list;
 list<libsaria::library::Driver *> driver_list;
 libsaria::Set lib_playlist("Library", PL_STATIC);
@@ -48,6 +49,8 @@ namespace libsaria
 		list<libsaria::library::Driver *>::iterator it;
 
 		path.visible = true;
+		path.id = next_id++;
+		path.next_track = 0;
 		path.path = dir;
 
 		path_list.push_back(path);

libsaria/track/track.cpp

@@ -64,6 +64,7 @@ namespace libsaria
 	{
 		filepath = file;
 		path = lib_path;
+		id = lib_path->next_track++;
 		count = 0;
 		last_day = 0;
 		last_month = 0;