library: Create a function for enabling and disabling paths

I also update the deck tests, since this is where changes will show up.

Signed-off-by: Anna Schumaker <schumaker.anna@gmail.com>

design/library.txt

@@ -179,6 +179,10 @@ Library: (lib/library.cpp)
 		Update all library paths.
 		Trigger the on_library_update() callback for each path.
 
+	void library :: set_enabled(unsigned int id, bool enabled);
+		Either enable or disable a library path.  Trigger
+		on_library_track_del() for each track disabled this way.
+
 	struct Song library :: lookup(track_id);
 		Fill out a Song structure for the provided track_id.
 		Throw -EEXIST if there is no track mapping to track_id.

include/library.h

@@ -121,6 +121,7 @@ namespace library
 	void del_path(unsigned int);
 	void update_path(unsigned int);
 	void update_all();
+	void set_enabled(unsigned int, bool);
 	void lookup(unsigned int, library :: Song *);
 	Library *lookup_path(unsigned int);
 	void import();

lib/library.cpp

@@ -510,6 +510,23 @@ void library :: update_all()
 		update_path(i);
 }
 
+void library :: set_enabled(unsigned int id, bool enabled)
+{
+	unsigned int t;
+
+	library_db[id].enabled = enabled;
+	library_db.save();
+
+	for (t = track_db.first(); t < track_db.num_rows(); t = track_db.next(t)) {
+		if (track_db[t].library_id == id) {
+			if (enabled)
+				get_callbacks()->on_library_track_add(t);
+			else
+				get_callbacks()->on_library_track_del(t);
+		}
+	}
+}
+
 void library :: lookup(unsigned int id, library :: Song *song)
 {
 	if (id >= track_db.num_rows())

tests/deck/deck.cpp

@@ -133,6 +133,15 @@ int main(int argc, char **argv)
 	test_4();
 	test_5();
 
+	print("Disabling library path\n");
+	library :: set_enabled(0, false);
+	print("Library size: %u\n", deck :: get_library_pq()->size());
+
+	print("Enabling library path\n");
+	library :: set_enabled(0, true);
+	print("Library size: %u\n", deck :: get_library_pq()->size());
+
+	print("Deleting library path\n");
 	library :: del_path(0);
 	while (idle :: run_task());
 	print("Library size: %u\n", deck :: get_library_pq()->size());

tests/deck/deck.good

@@ -125,4 +125,9 @@ Reading back playqueue deck
 deck[0] = Playqueue { size = 16, flags = 0 }
 deck[1] = Playqueue { size = 19, flags = 1 }
 deck[2] = Playqueue { size = 15, flags = 3 }
+Disabling library path
+Library size: 0
+Enabling library path
+Library size: 150
+Deleting library path
 Library size: 0

tests/library/library.cpp

@@ -262,6 +262,24 @@ void test_7()
 	library :: import();
 	run_idle_tasks();
 	library :: print_db(library :: DB_LIBRARY);
+	print("\n");
+}
+
+/* Test disabling libraries */
+void test_8()
+{
+	library :: reset();
+
+	test_add_dir("8a", "/tmp/library/0", true);
+	print("\n");
+	library :: set_enabled(0, false);
+	library :: print_db(library :: DB_LIBRARY);
+	library :: set_enabled(0, true);
+	library :: print_db(library :: DB_LIBRARY);
+	library :: set_enabled(0, false);
+	library :: print_db(library :: DB_LIBRARY);
+	library :: set_enabled(0, true);
+	library :: print_db(library :: DB_LIBRARY);
 }
 
 
@@ -282,5 +300,6 @@ int main(int argc, char **argv)
 	test_5();
 	test_6();
 	test_7();
+	test_8();
 	return 0;
 }

tests/library/library.good

@@ -2668,3 +2668,37 @@ Valid rows: 3
 db[0] = /tmp/library/2 (enabled), size = 150
 db[1] = /tmp/library/3 (enabled), size = 150
 db[2] = /tmp/library/4 (enabled), size = 150
+
+Test 8a: Added library 0: /tmp/library/0
+PASSED
+Updated library 0: /tmp/library/0 (size: 10)
+Updated library 0: /tmp/library/0 (size: 20)
+Updated library 0: /tmp/library/0 (size: 30)
+Updated library 0: /tmp/library/0 (size: 40)
+Updated library 0: /tmp/library/0 (size: 50)
+Updated library 0: /tmp/library/0 (size: 60)
+Updated library 0: /tmp/library/0 (size: 70)
+Updated library 0: /tmp/library/0 (size: 80)
+Updated library 0: /tmp/library/0 (size: 90)
+Updated library 0: /tmp/library/0 (size: 100)
+Updated library 0: /tmp/library/0 (size: 110)
+Updated library 0: /tmp/library/0 (size: 120)
+Updated library 0: /tmp/library/0 (size: 130)
+Updated library 0: /tmp/library/0 (size: 140)
+Updated library 0: /tmp/library/0 (size: 150)
+Allocated rows: 1
+Valid rows: 1
+db[0] = /tmp/library/0 (enabled), size = 150
+
+Allocated rows: 1
+Valid rows: 1
+db[0] = /tmp/library/0 (disabled), size = 150
+Allocated rows: 1
+Valid rows: 1
+db[0] = /tmp/library/0 (enabled), size = 150
+Allocated rows: 1
+Valid rows: 1
+db[0] = /tmp/library/0 (disabled), size = 150
+Allocated rows: 1
+Valid rows: 1
+db[0] = /tmp/library/0 (enabled), size = 150