When clicking a track in the file browser, play it

Includes adding a `playback.is_playable` for working out whether or not
a particular file is able to be played

lua/file_browser.lua

@@ -65,11 +65,15 @@ return screen:new {
               iterator = filesystem.iterator(item:filepath()),
               breadcrumb = item:filepath()
             })
-          end
-          if item:filepath():match("%.playlist$") then
+          elseif item:filepath():match("%.playlist$") then
             queue.open_playlist(item:filepath())
             playback.playing:set(true)
             backstack.push(playing:new())
+          elseif playback.is_playable(item:filepath()) then
+            queue.clear()
+            queue.add(item:filepath())
+            playback.playing:set(true)
+            backstack.push(playing:new())
           end
         end
       end

src/tangara/lua/file_iterator.cpp

@@ -79,7 +79,6 @@ auto FileIterator::iterate(bool show_hidden) -> bool {
           .index = offset_,
           .isHidden = hidden,
           .isDirectory = (info.fattrib & AM_DIR) > 0,
-          .isTrack = false,  // TODO
           .filepath = original_path_ + (original_path_.size() > 0 ? "/" : "") +
                       info.fname,
           .name = info.fname,

src/tangara/lua/file_iterator.hpp

@@ -19,7 +19,6 @@ struct FileEntry {
     int index;
     bool isHidden;
     bool isDirectory;
-    bool isTrack;
     std::string filepath;
     std::string name;
 };

src/tangara/lua/lua_filesystem.cpp

@@ -117,12 +117,6 @@ static auto file_entry_is_hidden(lua_State* state) -> int {
   return 1;
 }
 
-static auto file_entry_is_track(lua_State* state) -> int {
-  lua::FileEntry* entry = check_file_entry(state, 1);
-  lua_pushboolean(state, entry->isTrack);
-  return 1;
-}
-
 static auto file_entry_name(lua_State* state) -> int {
   lua::FileEntry* entry = check_file_entry(state, 1);
   lua_pushlstring(state, entry->name.c_str(), entry->name.size());
@@ -139,7 +133,6 @@ static const struct luaL_Reg kFileEntryFuncs[] = {{"filepath", file_entry_path},
                                                  {"name", file_entry_name},
                                                  {"is_directory", file_entry_is_dir},
                                                  {"is_hidden", file_entry_is_hidden},
-                                                 {"is_track", file_entry_is_track},
                                                  {"__tostring", file_entry_name},
                                                    {"__gc", file_entry_gc},
                                                  {NULL, NULL}};

src/tangara/ui/ui_fsm.cpp

@@ -15,6 +15,8 @@
 #include "FreeRTOSConfig.h"
 #include "draw/lv_draw_buf.h"
 #include "drivers/bluetooth.hpp"
+#include "lauxlib.h"
+#include "lua.h"
 #include "lvgl.h"
 
 #include "core/lv_group.h"
@@ -609,10 +611,24 @@ void Lua::entry() {
                          {"discovered_devices", &sBluetoothDiscoveredDevices},
                          {"known_devices", &sBluetoothKnownDevices},
                      });
-    registry.AddPropertyModule("playback", {
+    registry.AddPropertyModule(
+        "playback",
+        {
             {"playing", &sPlaybackPlaying},
             {"track", &sPlaybackTrack},
             {"position", &sPlaybackPosition},
+            {"is_playable",
+             [&](lua_State* s) {
+               size_t len;
+               const char* path = luaL_checklstring(s, 1, &len);
+               auto res = sServices->tag_parser().ReadAndParseTags({path, len});
+               if (res) {
+                 lua_pushboolean(s, true);
+               } else {
+                 lua_pushboolean(s, false);
+               }
+               return 1;
+             }},
         });
     registry.AddPropertyModule(
         "queue",