degesch: implement PRIVMSG handling

degesch.c

@@ -1849,7 +1849,52 @@ irc_handle_ping (struct app_context *ctx, const struct irc_message *msg)
 static void
 irc_handle_privmsg (struct app_context *ctx, const struct irc_message *msg)
 {
-	// TODO: log a message
+	if (!msg->prefix || msg->params.len < 2)
+		return;
+
+	const char *target = msg->params.vector[0];
+	const char *message = msg->params.vector[1];
+	struct buffer *buffer = str_map_find (&ctx->irc_buffer_map, target);
+
+	if (irc_is_channel (ctx, target))
+	{
+		struct channel *channel = str_map_find (&ctx->irc_channels, target);
+		hard_assert ((channel && buffer) ||
+			(channel && !buffer) || (!channel && !buffer));
+
+		// This is weird, ignoring
+		if (!channel)
+			return;
+	}
+	else if (!buffer)
+	{
+		// Get or make a user object
+		char *nickname = irc_cut_nickname (msg->prefix);
+		struct user *user = str_map_find (&ctx->irc_users, nickname);
+		if (!user)
+		{
+			user = user_new ();
+			user->nickname = xstrdup (nickname);
+			str_map_set (&ctx->irc_users, user->nickname, user);
+		}
+
+		// Open a new buffer for the user
+		buffer = buffer_new ();
+		buffer->type = BUFFER_PM;
+		buffer->name = xstrdup (nickname);
+		buffer->user = user_ref (user);
+		LIST_APPEND_WITH_TAIL (ctx->buffers, ctx->buffers_tail, buffer);
+		str_map_set (&ctx->irc_buffer_map, user->nickname, buffer);
+
+		free (nickname);
+	}
+
+	if (buffer)
+	{
+		// TODO: handle CTCP messages
+		buffer_send (ctx, buffer, BUFFER_LINE_PRIVMSG, 0,
+			msg->prefix, NULL, "%s", message);
+	}
 }
 
 static void