review fix: add maxParams for service commands

irc/utils/fieldsn.go

@@ -0,0 +1,52 @@
+package utils
+
+// Copyright (c) 2014 Kevin Wallace <kevin@pentabarf.net>
+// Found here: https://github.com/kevinwallace/fieldsn
+// Released under the MIT license
+// XXX this implementation treats negative n as "return nil",
+// unlike stdlib SplitN and friends, which treat it as "no limit"
+
+// Original source code below:
+
+// Package fieldsn implements FieldsN and FieldsFuncN,
+// which are conspicuously missing from the strings package.
+
+import (
+	"unicode"
+)
+
+// FieldsN is like strings.Fields, but returns at most n fields,
+// and the nth field includes any whitespace at the end of the string.
+func FieldsN(s string, n int) []string {
+	return FieldsFuncN(s, unicode.IsSpace, n)
+}
+
+// FieldsFuncN is like strings.FieldsFunc, but returns at most n fields,
+// and the nth field includes any runes at the end of the string normally excluded by f.
+func FieldsFuncN(s string, f func(rune) bool, n int) []string {
+	if n <= 0 {
+		return nil
+	}
+
+	a := make([]string, 0, n)
+	na := 0
+	fieldStart := -1
+	for i, rune := range s {
+		if f(rune) {
+			if fieldStart >= 0 {
+				a = append(a, s[fieldStart:i])
+				na++
+				fieldStart = -1
+			}
+		} else if fieldStart == -1 {
+			fieldStart = i
+			if na+1 == n {
+				break
+			}
+		}
+	}
+	if fieldStart >= 0 {
+		a = append(a, s[fieldStart:])
+	}
+	return a
+}