WIP: serialize requests

src/commands/queue/plchanges.rs

@@ -1,16 +1,33 @@
+use serde::{Deserialize, Serialize};
+
 use crate::{
     Request,
     commands::{
         Command, RequestParserError, RequestParserResult, ResponseAttributes, ResponseParserError,
     },
+    common::{Version, WindowRange},
 };
 
 pub struct PlChanges;
 
+#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
+pub struct PlChangesRequest {
+    pub version: Version,
+    pub window: Option<WindowRange>,
+}
+
 impl Command for PlChanges {
+    type Request = PlChangesRequest;
     type Response = ();
     const COMMAND: &'static str = "plchanges";
 
+    fn serialize_request(&self, request: Self::Request) -> String {
+        match request.window {
+            Some(window) => format!("{} {} {}", Self::COMMAND, request.version, window),
+            None => format!("{} {}", Self::COMMAND, request.version),
+        }
+    }
+
     fn parse_request(mut parts: std::str::SplitWhitespace<'_>) -> RequestParserResult<'_> {
         let version = parts.next().ok_or(RequestParserError::UnexpectedEOF)?;
         let version = version