Add basic IRC listener

.gitignore

@@ -0,0 +1 @@
+/jounce

cmd/jounce/main.go

@@ -0,0 +1,20 @@
+package main
+
+import (
+	"log"
+	"net"
+
+	"git.sr.ht/~emersion/jounce"
+)
+
+func main() {
+	addr := ":6667"
+
+	ln, err := net.Listen("tcp", addr)
+	if err != nil {
+		log.Fatalf("failed to start listener: %v", err)
+	}
+
+	log.Printf("Server listening on %v", addr)
+	log.Fatal(jounce.Serve(ln))
+}

go.mod

@@ -0,0 +1,5 @@
+module git.sr.ht/~emersion/jounce
+
+go 1.13
+
+require gopkg.in/irc.v3 v3.1.0

go.sum

@@ -0,0 +1,2 @@
+gopkg.in/irc.v3 v3.1.0 h1:AeDaEhQ/78gHfpbj/3mSi8FfiNIsFiVrWEgLzOwHWnU=
+gopkg.in/irc.v3 v3.1.0/go.mod h1:qE0DWv0j8Z8wCbFhA9783JBO0bufi3rttcV1Sjin8io=

server.go

@@ -0,0 +1,38 @@
+package jounce
+
+import (
+	"fmt"
+	"log"
+	"net"
+
+	"gopkg.in/irc.v3"
+)
+
+func handleConn(conn net.Conn) error {
+	defer conn.Close()
+
+	ircConn := irc.NewConn(conn)
+	for {
+		msg, err := ircConn.ReadMessage()
+		if err != nil {
+			return err
+		}
+
+		log.Println(msg)
+	}
+}
+
+func Serve(ln net.Listener) error {
+	for {
+		conn, err := ln.Accept()
+		if err != nil {
+			return fmt.Errorf("failed to accept connection: %v", err)
+		}
+
+		go func() {
+			if err := handleConn(conn); err != nil {
+				log.Printf("error handling connection: %v", err)
+			}
+		}()
+	}
+}