select.lua: show playlists with a title in watch later menu

Add redirect entries with a title to the watch later menu, e.g. youtube
playlists.

Checking for the title avoids showing redirect entries of local
directories, which would drastically increase the number of entries,
when you can already play adjacent local files with
--autocreate-playlist.

Author: Guido Cella

player/lua/select.lua

@@ -518,19 +518,31 @@ mp.add_key_binding(nil, "select-watch-later", function ()
         local file_handle = io.open(watch_later_file)
         if file_handle then
             local line1 = file_handle:read()
-            if line1 and line1 ~= "# redirect entry" and line1:find("^#") then
-                local entry = {
-                    path = line1:sub(3),
-                    time = utils.file_info(watch_later_file).mtime
-                }
+            local is_redirect = false
+
+            if line1 == "# redirect entry" then
+                is_redirect = true
+                line1 = file_handle:read()
+            end
+
+            if line1 and line1:find("^#") then
+                local entry = {}
+
                 for line in file_handle:lines() do
                     if line:find("^# title: ") then
                         entry.title = line:sub(10)
                         break
                     end
                 end
-                files[#files + 1] = entry
+
+                if not is_redirect or entry.title then
+                    entry.path = line1:sub(3)
+                    entry.time = utils.file_info(watch_later_file).mtime
+
+                    files[#files + 1] = entry
+                end
             end
+
             file_handle:close()
         end
     end