Fix handling of PART messages with no reason

client/src/js/reducers/channels.js

@@ -85,8 +85,7 @@ export default createReducer(Map(), {
   },
 
   [actions.SOCKET_PART](state, action) {
-    const { server, channels, user } = action;
-    const channel = channels[0];
+    const { server, channel, user } = action;
     if (state.hasIn([server, channel])) {
       return state.updateIn([server, channel, 'users'], users =>
         users.filter(u => u.nick !== user)

client/src/js/socket.js

@@ -45,8 +45,8 @@ export default function handleSocket(socket, { dispatch, getState }) {
     dispatch(inform(`${user} joined the channel`, server, channels[0]))
   );
 
-  socket.on('part', ({ user, server, channels, reason }) =>
-    dispatch(inform(withReason(`${user} left the channel`, reason), server, channels[0]))
+  socket.on('part', ({ user, server, channel, reason }) =>
+    dispatch(inform(withReason(`${user} left the channel`, reason), server, channel))
   );
 
   socket.on('quit', ({ user, server, reason, channels }) =>

server/irc_handler.go

@@ -84,19 +84,22 @@ func (i *ircHandler) join(msg *irc.Message) {
 }
 
 func (i *ircHandler) part(msg *irc.Message) {
-	i.session.sendJSON("part", Part{
-		Join: Join{
+	part := Part{
 		Server:  i.client.Host,
 		User:    msg.Nick,
-			Channels: msg.Params[:len(msg.Params)-1],
-		},
-		Reason: msg.LastParam(),
-	})
+		Channel: msg.Params[0],
+	}
 
-	channelStore.RemoveUser(msg.Nick, i.client.Host, msg.Params[0])
+	if len(msg.Params) == 2 {
+		part.Reason = msg.Params[1]
+	}
+
+	i.session.sendJSON("part", part)
+
+	channelStore.RemoveUser(msg.Nick, i.client.Host, part.Channel)
 
 	if msg.Nick == i.client.GetNick() {
-		go i.session.user.RemoveChannel(i.client.Host, msg.Params[0])
+		go i.session.user.RemoveChannel(i.client.Host, part.Channel)
 	}
 }
 

server/irc_handler_test.go

@@ -85,13 +85,23 @@ func TestHandleIRCPart(t *testing.T) {
 	})
 
 	checkResponse(t, "part", Part{
-		Join: Join{
 		Server:  "host.com",
 		User:    "parting",
-			Channels: []string{"#chan"},
-		},
+		Channel: "#chan",
 		Reason:  "the reason",
 	}, res)
+
+	res = dispatchMessage(&irc.Message{
+		Command: irc.Part,
+		Nick:    "parting",
+		Params:  []string{"#chan"},
+	})
+
+	checkResponse(t, "part", Part{
+		Server:  "host.com",
+		User:    "parting",
+		Channel: "#chan",
+	}, res)
 }
 
 func TestHandleIRCMode(t *testing.T) {

server/json.go

@@ -40,7 +40,10 @@ type Join struct {
 }
 
 type Part struct {
-	Join
+	Server   string   `json:"server"`
+	User     string   `json:"user"`
+	Channel  string   `json:"channel,omitempty"`
+	Channels []string `json:"channels,omitempty"`
 	Reason   string   `json:"reason,omitempty"`
 }