hid: add support for customized replies

hid/main.go

@@ -1081,8 +1081,10 @@ func (c *client) setPingTimer() {
 
 func (c *client) makeReply(id int, ap ...interface{}) string {
 	s := fmt.Sprintf(":%s %03d %s ", serverName, id, c.nicknameOrStar())
-	a := fmt.Sprintf(defaultReplies[id], ap...)
-	return s + a
+	if reply, ok := catalog[id]; ok {
+		return s + fmt.Sprintf(reply, ap...)
+	}
+	return s + fmt.Sprintf(defaultReplies[id], ap...)
 }
 
 // XXX: This way simple static analysis cannot typecheck the arguments, so we
@@ -3150,9 +3152,43 @@ func ircInitializeTLS() error {
 }
 
 func ircInitializeCatalog() error {
-	// TODO: Not going to use catgets but a simple text file with basic
-	// checking whether the index is used by this daemon at all should do.
-	return nil
+	configCatalog := config["catalog"]
+	if configCatalog == "" {
+		return nil
+	}
+
+	path := resolveFilename(configCatalog, resolveRelativeConfigFilename)
+	if path == "" {
+		return fmt.Errorf("cannot find file: %s", configCatalog)
+	}
+
+	f, err := os.Open(path)
+	if err != nil {
+		return fmt.Errorf("failed reading the MOTD file: %s", err)
+	}
+	defer f.Close()
+
+	scanner := bufio.NewScanner(f)
+	catalog = make(map[int]string)
+	for lineNo := 1; scanner.Scan(); lineNo++ {
+		line := strings.TrimLeft(scanner.Text(), " \t")
+		if line == "" || strings.HasPrefix(line, "#") {
+			continue
+		}
+
+		delim := strings.IndexAny(line, " \t")
+		if delim < 0 {
+			return fmt.Errorf("%s:%d: malformed line", path, lineNo)
+		}
+
+		id, err := strconv.ParseUint(line[:delim], 10, 16)
+		if err != nil {
+			return fmt.Errorf("%s:%d: %s", path, lineNo, err)
+		}
+
+		catalog[int(id)] = line[delim+1:]
+	}
+	return scanner.Err()
 }
 
 func ircInitializeMOTD() error {