From 69a35069efe1d7ce096a0ac58acc1c510c677c06 Mon Sep 17 00:00:00 2001
From: Simon Ser <contact@emersion.fr>
Date: Fri, 7 Feb 2020 13:36:32 +0100
Subject: [PATCH] Handle downstream PART messages

---
 downstream.go | 13 +++++++++++++
 server.go     |  5 ++++-
 2 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/downstream.go b/downstream.go
index 0283358..45c4922 100644
--- a/downstream.go
+++ b/downstream.go
@@ -261,6 +261,19 @@ func (c *downstreamConn) handleMessageRegistered(msg *irc.Message) error {
 			Command: irc.ERR_NOSUCHCHANNEL,
 			Params:  []string{name, "Channel name ambiguous"},
 		}}
+	case "PART":
+		var name string
+		if err := parseMessageParams(msg, &name); err != nil {
+			return err
+		}
+
+		ch, err := c.user.getChannel(name)
+		if err != nil {
+			return err
+		}
+
+		ch.conn.messages <- msg
+		// TODO: remove channel from upstream config
 	case "MODE":
 		var name string
 		if err := parseMessageParams(msg, &name); err != nil {
diff --git a/server.go b/server.go
index ef5d4e5..dae434e 100644
--- a/server.go
+++ b/server.go
@@ -75,7 +75,10 @@ func (u *user) getChannel(name string) (*upstreamChannel, error) {
 		}
 	})
 	if channel == nil {
-		return nil, fmt.Errorf("unknown channel %q", name)
+		return nil, ircError{&irc.Message{
+			Command: irc.ERR_NOSUCHCHANNEL,
+			Params:  []string{name, "No such channel"},
+		}}
 	}
 	return channel, nil
 }