Plumb queue next+previous through to Lua, incl. with stubs and docs.

ldoc-stubs/queue.lua

@@ -19,4 +19,10 @@ queue.replay = types.Property
 -- @see types.Property
 queue.random = types.Property
 
+--- Moves forward in the play queue, looping back around to the beginning if repeat is on.
+function queue.next() end
+
+--- Moves backward in the play queue, looping back around to the end if repeat is on.
+function queue.previous() end
+
 return queue

luals-stubs/queue.lua

@@ -8,4 +8,7 @@
 --- @field random Property  Determines whether, when progressing to the next track in the queue, the next track will be chosen randomly. The random selection algorithm used is a Miller Shuffle, which guarantees that no repeat selections will be made until every item in the queue has been played. Writeable.
 local queue = {}
 
+function queue.next() end
+function queue.previous() end
+
 return queue

src/ui/include/ui_fsm.hpp

@@ -164,6 +164,9 @@ class Lua : public UiState {
   auto SetPlaying(const lua::LuaValue&) -> bool;
   auto SetRandom(const lua::LuaValue&) -> bool;
   auto SetRepeat(const lua::LuaValue&) -> bool;
+
+  auto QueueNext(lua_State*) -> int;
+  auto QueuePrevious(lua_State*) -> int;
 };
 
 }  // namespace states

src/ui/ui_fsm.cpp

@@ -396,7 +396,11 @@ void Lua::entry() {
                                          {"track", &sPlaybackTrack},
                                          {"position", &sPlaybackPosition},
                                      });
-    sLua->bridge().AddPropertyModule("queue", {
+    sLua->bridge().AddPropertyModule(
+        "queue",
+        {
+            {"next", [&](lua_State* s) { return QueueNext(s); }},
+            {"previous", [&](lua_State* s) { return QueuePrevious(s); }},
             {"position", &sQueuePosition},
             {"size", &sQueueSize},
             {"replay", &sQueueRepeat},
@@ -476,6 +480,16 @@ auto Lua::PushLuaScreen(lua_State* s) -> int {
   return 0;
 }
 
+auto Lua::QueueNext(lua_State*) -> int {
+  sServices->track_queue().next();
+  return 0;
+}
+
+auto Lua::QueuePrevious(lua_State*) -> int {
+  sServices->track_queue().previous();
+  return 0;
+}
+
 auto Lua::PopLuaScreen(lua_State* s) -> int {
   PopScreen();
   luavgl_set_root(s, sCurrentScreen->content());