Add ‘ints’ package for returning bounded number values from arguments

util/ints/ints.go

@@ -0,0 +1,58 @@
+// Copyright © 2016 Abcum Ltd
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package ints
+
+func Min(min int, vals ...int) int {
+	for _, val := range vals {
+		if val < min {
+			min = val
+		}
+	}
+	return min
+}
+
+func Max(max int, vals ...int) int {
+	for _, val := range vals {
+		if val > max {
+			max = val
+		}
+	}
+	return max
+}
+
+func Below(cen, val int) int {
+	if val < cen {
+		return val
+	}
+	return cen
+}
+
+func Above(cen, val int) int {
+	if val > cen {
+		return val
+	}
+	return cen
+}
+
+func Between(min, max, val int) int {
+	switch {
+	case val < min:
+		return min
+	case val > max:
+		return max
+	default:
+		return val
+	}
+}