Refactor generateWHOXReply

Isolate the field letter -> value logic into a separate function.

irc.go

@@ -728,6 +728,10 @@ func parseChatHistoryBound(param string) time.Time {
 	}
 }
 
+// whoxFields is the list of all WHOX field letters, by order of appearance in
+// RPL_WHOSPCRPL messages.
+var whoxFields = []byte("tcuihsnfdlaor")
+
 type whoxInfo struct {
 	Token    string
 	Username string
@@ -739,6 +743,42 @@ type whoxInfo struct {
 	Realname string
 }
 
+func (info *whoxInfo) get(field byte) string {
+	switch field {
+	case 't':
+		return info.Token
+	case 'c':
+		return "*"
+	case 'u':
+		return info.Username
+	case 'i':
+		return "255.255.255.255"
+	case 'h':
+		return info.Hostname
+	case 's':
+		return info.Server
+	case 'n':
+		return info.Nickname
+	case 'f':
+		return info.Flags
+	case 'd':
+		return "0"
+	case 'l': // idle time
+		return "0"
+	case 'a':
+		account := "0" // WHOX uses "0" to mean "no account"
+		if info.Account != "" && info.Account != "*" {
+			account = info.Account
+		}
+		return account
+	case 'o':
+		return "0"
+	case 'r':
+		return info.Realname
+	}
+	return ""
+}
+
 func generateWHOXReply(prefix *irc.Prefix, nick, fields string, info *whoxInfo) *irc.Message {
 	if fields == "" {
 		return &irc.Message{
@@ -753,55 +793,18 @@ func generateWHOXReply(prefix *irc.Prefix, nick, fields string, info *whoxInfo)
 		fieldSet[fields[i]] = true
 	}
 
-	var params []string
-	if fieldSet['t'] {
-		params = append(params, info.Token)
-	}
-	if fieldSet['c'] {
-		params = append(params, "*")
-	}
-	if fieldSet['u'] {
-		params = append(params, info.Username)
-	}
-	if fieldSet['i'] {
-		params = append(params, "255.255.255.255")
-	}
-	if fieldSet['h'] {
-		params = append(params, info.Hostname)
-	}
-	if fieldSet['s'] {
-		params = append(params, info.Server)
-	}
-	if fieldSet['n'] {
-		params = append(params, info.Nickname)
-	}
-	if fieldSet['f'] {
-		params = append(params, info.Flags)
-	}
-	if fieldSet['d'] {
-		params = append(params, "0")
-	}
-	if fieldSet['l'] { // idle time
-		params = append(params, "0")
-	}
-	if fieldSet['a'] {
-		account := "0" // WHOX uses "0" to mean "no account"
-		if info.Account != "" && info.Account != "*" {
-			account = info.Account
+	var values []string
+	for _, field := range whoxFields {
+		if !fieldSet[field] {
+			continue
 		}
-		params = append(params, account)
-	}
-	if fieldSet['o'] {
-		params = append(params, "0")
-	}
-	if fieldSet['r'] {
-		params = append(params, info.Realname)
+		values = append(values, info.get(field))
 	}
 
 	return &irc.Message{
 		Prefix:  prefix,
 		Command: rpl_whospcrpl,
-		Params:  append([]string{nick}, params...),
+		Params:  append([]string{nick}, values...),
 	}
 }