feat: show cursors on correct buffers

also made proper bindings for CursorEvent and CursorPosition

src/codemp.lua

@@ -132,7 +132,6 @@ vim.api.nvim_create_user_command(
 	"Join",
 	function (args)
 		local controller = codemp.join(args.args)
-		local buffer = vim.api.nvim_get_current_buf()
 
 		-- hook serverbound callbacks
 		vim.api.nvim_create_autocmd({"CursorMoved", "CursorMovedI", "ModeChanged"}, {
@@ -154,14 +153,17 @@ vim.api.nvim_create_user_command(
 					hi = available_colors[ math.random( #available_colors ) ],
 				}
 			end
-			vim.api.nvim_buf_clear_namespace(buffer, user_mappings[event.user].ns, 0, -1)
+			local buffer = buffer_mappings[event.position.buffer]
-			multiline_highlight(
+			if buffer ~= nil then
-				buffer,
+				vim.api.nvim_buf_clear_namespace(buffer, user_mappings[event.user].ns, 0, -1)
-				user_mappings[event.user].ns,
+				multiline_highlight(
-				user_mappings[event.user].hi,
+					buffer,
-				event.start,
+					user_mappings[event.user].ns,
-				event.finish
+					user_mappings[event.user].hi,
-			)
+					event.position.start,
+					event.position.finish
+				)
+			end
 		end)
 
 		print(" ++ joined workspace " .. args.args)

src/lib.rs

@@ -13,22 +13,7 @@ impl From::<LuaCodempError> for LuaError {
 	}
 }
 
-fn cursor_to_table(lua: &Lua, cur: CodempCursorEvent) -> LuaResult<LuaTable> {
+// TODO put friendlier constructor directly in lib?
-	let pos = cur.position.unwrap_or_default();
-	let start = lua.create_table()?;
-	start.set(1, pos.start().row)?;
-	start.set(2, pos.start().col)?;
-	let end = lua.create_table()?;
-	end.set(1, pos.end().row)?;
-	end.set(2, pos.end().col)?;
-	let out = lua.create_table()?;
-	out.set("user", cur.user)?;
-	out.set("buffer", pos.buffer)?;
-	out.set("start", start)?;
-	out.set("finish", end)?;
-	Ok(out)
-}
-
 fn make_cursor(buffer: String, start_row: i32, start_col: i32, end_row: i32, end_col: i32) -> CodempCursorPosition {
 	CodempCursorPosition {
 		buffer,
@@ -67,6 +52,8 @@ fn get_buffer(_: &Lua, (path,): (String,)) -> LuaResult<LuaBufferController> {
 	)
 }
 
+
+
 /// join a remote workspace and start processing cursor events
 fn join(_: &Lua, (session,): (String,)) -> LuaResult<LuaCursorController> {
 	let controller = CODEMP_INSTANCE.join(&session)
@@ -82,9 +69,9 @@ impl LuaUserData for LuaCursorController {
 		methods.add_method("send", |_, this, (usr, sr, sc, er, ec):(String, i32, i32, i32, i32)| {
 			Ok(this.0.send(make_cursor(usr, sr, sc, er, ec)).map_err(LuaCodempError::from)?)
 		});
-		methods.add_method("try_recv", |lua, this, ()| {
+		methods.add_method("try_recv", |_, this, ()| {
 			match this.0.try_recv() .map_err(LuaCodempError::from)? {
-				Some(x) => Ok(Some(cursor_to_table(lua, x)?)),
+				Some(x) => Ok(Some(LuaCursorEvent(x))),
 				None => Ok(None),
 			}
 		});
@@ -96,6 +83,27 @@ impl LuaUserData for LuaCursorController {
 	}
 }
 
+#[derive(Debug, derive_more::From)]
+struct LuaCursorEvent(CodempCursorEvent);
+impl LuaUserData for LuaCursorEvent {
+	fn add_fields<'lua, F: LuaUserDataFields<'lua, Self>>(fields: &mut F) {
+		fields.add_field_method_get("user", |_, this| Ok(this.0.user.clone()));
+		fields.add_field_method_get("position", |_, this|
+			Ok(this.0.position.as_ref().map(|x| LuaCursorPosition(x.clone())))
+		);
+	}
+}
+
+#[derive(Debug, derive_more::From)]
+struct LuaCursorPosition(CodempCursorPosition);
+impl LuaUserData for LuaCursorPosition {
+	fn add_fields<'lua, F: LuaUserDataFields<'lua, Self>>(fields: &mut F) {
+		fields.add_field_method_get("buffer", |_, this| Ok(this.0.buffer.clone()));
+		fields.add_field_method_get("start",  |_, this| Ok(LuaRowCol(this.0.start())));
+		fields.add_field_method_get("finish", |_, this| Ok(LuaRowCol(this.0.end())));
+	}
+}
+
 
 
 /// create a new buffer in current workspace