commands/listplaylistinfo: add response type

src/commands/stored_playlists/listplaylistinfo.rs

@@ -1,6 +1,7 @@
 use serde::{Deserialize, Serialize};
 
 use crate::{
+    DbSongInfo, Priority, SongId, SongPosition,
     commands::{Command, RequestParserError, ResponseParserError},
     common::types::{PlaylistName, WindowRange},
     request_tokenizer::RequestTokenizer,
@@ -15,9 +16,19 @@ pub struct ListPlaylistInfoRequest {
     range: Option<WindowRange>,
 }
 
+pub type ListPlaylistInfoResponse = Vec<ListPlaylistInfoResponseEntry>;
+
+#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
+pub struct ListPlaylistInfoResponseEntry {
+    position: SongPosition,
+    id: SongId,
+    priority: Priority,
+    song_info: DbSongInfo,
+}
+
 impl Command for ListPlaylistInfo {
     type Request = ListPlaylistInfoRequest;
-    type Response = ();
+    type Response = ListPlaylistInfoResponse;
     const COMMAND: &'static str = "listplaylistinfo";
 
     fn serialize_request(&self, request: Self::Request) -> String {