Very initial RPL_ISUPPORT numeric support

irc/isupport.go

@@ -0,0 +1,66 @@
+package irc
+
+import (
+	"fmt"
+	"strings"
+)
+
+// ISupportList holds a list of ISUPPORT tokens
+type ISupportList struct {
+	Tokens      map[string]*string
+	CachedReply []string
+}
+
+// NewISupportList returns a new ISupportList
+func NewISupportList() *ISupportList {
+	var il ISupportList
+	il.Tokens = make(map[string]*string)
+	il.CachedReply = make([]string, 0)
+	return &il
+}
+
+// Add adds an RPL_ISUPPORT token to our internal list
+func (il *ISupportList) Add(name string, value string) {
+	il.Tokens[name] = &value
+}
+
+// AddNoValue adds an RPL_ISUPPORT token that does not have a value
+func (il *ISupportList) AddNoValue(name string) {
+	il.Tokens[name] = nil
+}
+
+// RegenerateCachedReply regenerates the cached RPL_ISUPPORT reply
+func (il *ISupportList) RegenerateCachedReply() {
+	il.CachedReply = make([]string, 0)
+	maxlen := 400      // Max length of a single ISUPPORT token line
+	var length int     // Length of the current cache
+	var cache []string // Token list cache
+
+	for name, value := range il.Tokens {
+		var token string
+		if value == nil {
+			token = name
+		} else {
+			token = fmt.Sprintf("%s=%s", name, *value)
+		}
+
+		if len(token)+length <= maxlen {
+			// account for the space separating tokens
+			if len(cache) > 0 {
+				length++
+			}
+			cache = append(cache, token)
+			length += len(token)
+		}
+
+		if len(cache) == 13 || len(token)+length >= maxlen {
+			il.CachedReply = append(il.CachedReply, strings.Join(cache, " "))
+			cache = make([]string, 0)
+			length = 0
+		}
+	}
+
+	if len(cache) > 0 {
+		il.CachedReply = append(il.CachedReply, strings.Join(cache, " "))
+	}
+}