From 64291ff02c17e8c9c9ce4846103ed6e32c7b63d9 Mon Sep 17 00:00:00 2001
From: Anna Schumaker <Anna@OcarinaProject.net>
Date: Fri, 6 Feb 2015 14:31:37 -0500
Subject: [PATCH] playlist: Add an "unplayed tracks" dynamic playlist

Unplayed tracks is a dynamic playlist generated whenever we are asked to
select the "Unplayed" playlist.  Note that dynamic playlists aren't
hooked up to the other playlist functions (has, add, del, or
get_tracks).  This is to avoid adding them to the index and potentially
writing out to disk.

Signed-off-by: Anna Schumaker <Anna@OcarinaProject.net>
---
 core/playlist.cpp       | 25 ++++++++++++++++++++-----
 tests/core/playlist.cpp |  5 +++++
 2 files changed, 25 insertions(+), 5 deletions(-)

diff --git a/core/playlist.cpp b/core/playlist.cpp
index d2af5879..aacc08bc 100644
--- a/core/playlist.cpp
+++ b/core/playlist.cpp
@@ -32,6 +32,21 @@ public:
 			add(tags :: get_track(*it));
 	}
 
+	void dynamic_fill(const std::string &name)
+	{
+		Track *track;
+
+		if (name != "Unplayed")
+			return;
+
+		clear();
+		for (unsigned int i = 0; i < tags :: track_size(); i++) {
+			track = tags :: get_track(i);
+			if ((track != NULL) && (track->count() == 0))
+				add(track);
+		}
+	}
+
 };
 
 
@@ -89,13 +104,13 @@ void playlist :: del(Track *track, const std::string &name)
 
 void playlist :: select(const std::string &name)
 {
-	IndexEntry *ent;
+	IndexEntry *ent = playlist_db.find(name);
 
-	ent = playlist_db.find(name);
-	if (ent == NULL)
-		return;
+	if (ent != NULL)
+		playlist_q.fill(ent);
+	else
+		playlist_q.dynamic_fill(name);
 
-	playlist_q.fill(ent);
 	cur_plist = name;
 }
 
diff --git a/tests/core/playlist.cpp b/tests/core/playlist.cpp
index 3d428891..2a43e63c 100644
--- a/tests/core/playlist.cpp
+++ b/tests/core/playlist.cpp
@@ -45,6 +45,9 @@ static void test_queue()
 
 	playlist :: select("Favorites");
 	test_equal(q->size(), (unsigned)8);
+
+	playlist :: select("Unplayed");
+	test_equal(q->size(), (unsigned)3);
 }
 
 static void test_add()
@@ -53,6 +56,8 @@ static void test_add()
 	Queue *q = playlist :: get_queue();
 	Queue *l = library :: get_queue();
 
+	playlist :: select("Favorites");
+
 	playlist :: add(tags :: get_track(5), "Banned");
 	ent = playlist :: get_tracks("Banned");
 	test_equal(ent->size(), (size_t)5);